[go: up one dir, main page]

EP0288150B1 - Verfahren zum Pelletieren von Erzen - Google Patents

Verfahren zum Pelletieren von Erzen Download PDF

Info

Publication number
EP0288150B1
EP0288150B1 EP88302455A EP88302455A EP0288150B1 EP 0288150 B1 EP0288150 B1 EP 0288150B1 EP 88302455 A EP88302455 A EP 88302455A EP 88302455 A EP88302455 A EP 88302455A EP 0288150 B1 EP0288150 B1 EP 0288150B1
Authority
EP
European Patent Office
Prior art keywords
polymer
ore
process according
weight
cationic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88302455A
Other languages
English (en)
French (fr)
Other versions
EP0288150A1 (de
Inventor
Anthony Allen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ciba Specialty Chemicals Water Treatments Ltd
Original Assignee
Allied Colloids Ltd
Ciba Specialty Chemicals Water Treatments Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26292050&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0288150(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from GB878706932A external-priority patent/GB8706932D0/en
Priority claimed from GB878712552A external-priority patent/GB8712552D0/en
Application filed by Allied Colloids Ltd, Ciba Specialty Chemicals Water Treatments Ltd filed Critical Allied Colloids Ltd
Publication of EP0288150A1 publication Critical patent/EP0288150A1/de
Application granted granted Critical
Publication of EP0288150B1 publication Critical patent/EP0288150B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic

Definitions

  • Iron ore needs to be in the form of agglomerates of substantial size when it is charged into a blast furnace. If the available ore is in the form of particles that are too small for direct feed to the blast furnace it is necessary to convert them to a sinter or to pellets. With the increasing use of lower grade ores it has become necessary to grind the ore more finely and, for these fine particles, pelletisation is the only satisfactory method of production of feedstock for the furnaces.
  • the pellets are made by adding binder to the fine particulate ore and stirring in the presence of a small amount of water (generally moisture in the ore) to form a moist mixture, and then pelletising the mixture, e.g., in a balling drum or disc pelletiser.
  • the green pellets are then fired in a kiln through a temperature range that extends from an inlet temperature typically in the range 200-400°C up to a final temperature of e.g., 1200°C.
  • Important properties of the pellets are the initial or wet strength, the dry strength (after drying the green pellets in an oven at 105°C) and the tendency of the pellets to spall (or burst) upon exposure to firing temperatures.
  • the tendency for spalling can be defined by determining the minimum temperature at which spalling occurs or by observing the percentage of fines formed during a particular firing cycle.
  • the moisture content of the mixture and the porosity of the pellets must be chosen carefully.
  • a high "drop number" for the green pellets is desirable.
  • the amount of binder should be as low as possible and, to ensure uniform properties, its flow properties must be such that it can easily be added uniformly in these low quantities.
  • bentonite is the binder that is generally used.
  • a disadvantage of the process in GB 1,324,838 is that it is necessary to introduce substantial amounts of water with the polymer and so the initial iron ore must be very dry (involving the use of drying energy) or the final pellets will be very wet (increasing the risk of spalling).
  • a problem with bentonite and other binders is that the spalling temperature is low.
  • the inlet temperature of the kiln has to be in the range 200 to 400°C to prevent spalling. Higher inlet temperatures would be economically desirable if spalling could still be avoided.
  • a difficulty with powdered cellulosic binders such as carboxymethyl cellulose is that the irregular particle shape and size distribution is such that the powder does not flow freely. Instead the dry particles tend to clump together rather than flow over one another. As a result it is difficult to achieve uniform supply of the low dosages that are required.
  • Another problem is that the amount of cellulosic binder that has to be used for adequate strength tends to be too high to be cost effective.
  • Another problem with some cellulosic polymers is that they can reduce surface tension, and this appears to be undesirable in pellet formation.
  • EP 0203855A2 (not published until after the priority date of this application) it is proposed to use a water soluble high molecular weight polymer in the form of a dry powder or, preferably, a water-in-oil emulsion that preferably contains both water-in-oil and oil-in-water surfactants.
  • Non-ionic, anionic and cationic polymers are proposed.
  • the use of the polymer in combination, with an inorganic salt, to increase strength, is also proposed.
  • Rhone Poulenc AD10 which is said to be a non-ionic polyacrylamide having intrinsic viscosity (IV) 15.4dl/g and which we believe to be a coarse crushed gel product
  • Percol 725 and Percol 726 both of which are made by the assignees of the present application.
  • Percol 725 is a crushed gel copolymer having IV about 18 of 80% acrylamide and 20% by weight sodium acrylate
  • Percol 726 is a bead copolymer of about 65% acrylamide and 35% by weight sodium acrylate and has IV about 17.
  • Percol 726 is made by reverse phase polymerisation and a significant amount of the particles have a dry size above 450 ⁇ m and up to about 800 ⁇ m, and the crushed gel of Percol 725 also has a particle size of up to about 800 ⁇ m.
  • the iron ore always has a very small particle size, and therefore a huge surface area.
  • the binder must be introduced with the absolute minimum of water in order that the pellets can conveniently have a total moisture content of not more than about 15%.
  • the duration and energy of mixing the binder with the iron ore particles must be as short as possible in order to maximise production and minimise capital costs.
  • the amount of binder must be as low as possible in order to minimise cost and to avoid the risk of excess binder accentuating the stickiness problems noted in the article by R.L.Smythe.
  • Bentonite has a very small particle size (typically below 10 ⁇ m) and adequate admixture of these very small particles with the particulate iron ore is achieved because the bentonite is used in a relatively large amount (typically 1%).
  • a binder that is substantially coarser and/or present in a substantially smaller amount would tend to give less satisfactory results, due to non-uniform mixing of the binder with the relatively large volume of very fine particulate iron ore.
  • mineral ore pellets are made by adding binder comprising organic polymer to particulate mineral ore having substantially all particles below 250 ⁇ m and stirring in the presence of about 5 to about 15% by weight water (based on total mixture) to form a substantially homogeneous moist mixture and pelletising the moist mixture.
  • pellets are made from mineral ore by adding binder comprising organic polymer to acidic particulate mineral ore having substantially all particles below 250 ⁇ m and stirring in the presence of 5 to 15% by weight water (based on total mix) to form a substantially homogeneous moist mixture and pelletising the moist mixture, and in this process the binder comprises about 0.002% to about 0.5% by weight, based on total mix, of water soluble polymer that is cationic.
  • the pH of the resultant water may depend upon the amount of ore that is used but at higher amounts of ore, typically 30 to 40% solids, the pH becomes substantially independent of the amount of ore. It is this pH, that is substantially independent of ore concentration, which is intended herein when reference is made to the ore giving a specified pH.
  • Normal ores give a pH of above 8.1, typically 8.2 to 8.4 or higher.
  • the invention is directed to the treatment of ores which are acidic and give a pH in this test of up to 6.
  • the mineral can be any acidic ore, e.g., a zinc ore, but is preferably an iron ore, normally a haematite, magnetite or taconite.
  • the ore may be naturally acidic or may have been rendered acidic by some treatment prior to blending with the binder. For instance the ore may have been washed with acid to remove acid soluble components, typically to produce a pH of from 5 to 6 if manganese is being washed out of the ore.
  • the ore may have acquired an acidic pH during other processing treatments.
  • the ore may be dried under conditions that result in the dry ore giving the specified relatively low pH in water. This may be because, for instance, the drying is conducted using hot gases that contain sulphur or other impurities that cause acidification of the ore during drying or may be due to chemical changes in the surface properties of the ore that are caused by dehydration.
  • a preferred process of the invention comprises forming acidic particulate ore from the mineral ore (that can be of low grade) by a process comprising washing or leaching the mineral ore in acid, and thereafter using the resultant, enriched, acidic particulate ore for pelletising. It has not previously been practicable to use acid washed or acid leached ores for pelletising.
  • the ore that is acid washed or leached is normally an iron ore.
  • the soluble cationic polymer is formed by the polymerisation of cationic ethylenically unsaturated monomer, optionally with other ethylenically unsaturated monomers.
  • the monomer or monomer blend will normally be water soluble.
  • One suitable class of cationic monomers are the dialkylaminoalkyl (meth) acrylates, especially dimethylaminoethyl (meth) acrylate (DMAEA or DMAEMA).
  • Another suitable class are the dialkylaminoalkyl (meth) acrylamides.
  • a suitable material is dimethylaminopropyl (meth) acrylamide. All such monomers are generally present in the form of acid addition or quaternary ammonium salts.
  • a suitable monomer is methacrylamido propyl trimethyl ammonium chloride (MAPTAC).
  • suitable cationic monomers include diallyl dialkyl quaternary monomers, especially diallyl dimethyl ammonium chloride (DADMAC).
  • DMDMAC diallyl dimethyl ammonium chloride
  • Preferred cationic polymers are polymers having recurring quaternary ammonium groups. Blends of cationic polymers (e.g., a blend of synthetic cationic with natural or modified natural cationic polymer) can be used.
  • the polymers can be copolymerised with non-ionic monomers, generally (meth) acrylamide (ACM).
  • suitable cationic polymers are polyethylene imines and epichlorhydrin polyamine reaction products made in bead form.
  • homopolymers and other polymers having a very high cationic content can be of relatively low molecular weight, for instance having intrinsic viscosity below 5 dl/g, often in the range 0.4 to 2 dl/g.
  • ethylenically unsaturated monomers at least 70 weight percent, and preferably at least 90 weight percent, of the monomers should be cationic, and preferably the polymer is substantially a homopolymer.
  • polymers have medium to high molecular weight and medium cationic content.
  • the IV may be from about 3 to about 20 dl/g or higher, generally 3 to 12 dl/g, preferably from 5 to 9 dl/g.
  • Such polymers are best made by copolymerisation of about 20 to about 75, preferably about 25 to about 60, weight percent cationic monomer with a non-ionic monomer such as acrylamide. Best results are generally obtained with about 35 to about 55 weight percent cationic monomer, with the balance non-ionic.
  • the cationic polymer can be added in other forms.
  • it can be added in the form of particles that are within the size ranges discussed above for beads but which have been made by comminution of gel in air or, preferably, in an organic liquid for instance as described in EP 169674. It may be necessary to sieve the particles to give the desired particle range and to exclude oversize particles.
  • polystyrene resin instead of being a synthetic polymer, it can be a naturally occurring polymer (or a modified natural polymer) such as Chitosan or cationic starch, but this usually less satisfactory than the use of synthetic polymers.
  • the polymer can initially be provided in any suitable physical form.
  • the aqueous polymer solution may be sprayed on to the ore prior to pelleting.
  • the solution can be made from polymer in the form of a concentrated solution, a polymer-in-oil dispersion or powder.
  • the polymer-in-oil dispersion of the polymer can be added direct to the ore.
  • the polymer particles in any such dispersion can be dry or can be swollen gel particles.
  • the polymer is added in the form of dry, free flowing powder having substantially all particles below about 300 ⁇ m, usually in the range about 20 to about 300 ⁇ m.
  • the particles can be comminuted gel, especially if the comminuted gel particles had been formed or treated in known manner so as to promote their flow, but preferably the particles are beads, for instance as made by reverse phase bead polymerisation.
  • Reverse phase bead polymerisation is a well known process.
  • an aqueous solution of the chosen monomer or monomer blend is dispersed in water immiscible liquid, generally in the absence of an emulsifying agent but often in the presence of an amphipathic polymeric stabiliser, the polymerisation is induced in conventional manner to provide a suspension of gel particles in the non-aqueous liquid, the suspension is then dried by azeotropic distillation and the particles are separated from the non-aqueous liquid in conventional manner.
  • the desired particle size range is controlled in known manner, for instance by the choice of stabiliser, emulsifying agent (if present) and, especially, the degree of agitation during the formation, of the initial suspension of aqueous monomer particles in the water immiscible liquid.
  • the beads are substantially spherical.
  • Some reverse phase polymerisation methods involve the use of relatively large amounts or emulsifiers or other materials that depress surface tension. It is particularly desirable in the invention to make the polymer particles in the substantial absence or any such material. In particular, it is desirable that the entire binder (and also the polymer component of the binder) should have substantially no depressant effect on surface tension. Thus if binder is dissolved with water at 20°C at 0.075% by weight concentration the surface tension of the solution should be above 65, and preferably above 70 ⁇ 10 ⁇ 5N(dynes)/cm. Thus it is preferred to avoid the use of amounts of surfactant that would depress surface tension significantly and reliance should be placed instead on agitation or stabiliser, in known manner, to control bead size.
  • the powdered binder that is added to the ore includes additional monomeric compound that is usually an inorganic or organic electrolyte but can be a non-electrolyte.
  • the compound is normally water soluble and inorganic and so is preferably a water soluble salt of an acid.
  • salts of strong acids e.g., sodium chloride, sulphate or nitrate
  • the strong acid salts may generate corrosive acids during smelting or firing.
  • organic molecules such as urea, inorganic water soluble salts of carboxylic, dicarboxylic and tricarboxylic acids such as sodium acetate, sodium citrate, sodium oxalate, sodium tartrate, sodium benzoate and sodium stearate, other sodium salts of weak acids such as sodium bicarbonate and sodium carbonate, other miscellaneous sodium salts such as sodium silicate or phosphate, the corresponding ammonium, potassium, calcium or magnesium salts of the preceding salts and calcium oxide.
  • Sodium carbonate, bicarbonate or silicate are generally preferred as they give the best anti-spalling and dry strength results.
  • beads made by reverse phase bead polymerisation are those that they can readily be added in very uniform and very small amounts to the ore that is to be pelleted, because of the substantially spherical shape of the beads.
  • the binder is to be a blend of the polymer with other material such as any of the compounds discussed above then this other material should also be added in a form that is easily flowable on to the ore.
  • the compound is incorporated in the beads.
  • a salt of a weak acid can be present in the aqueous monomer during polymerisation.
  • the compound can be added separately to the ore or it can be preblended with the polymer beads, but in either instance the compound itself is preferably put into a free flowable, generally bead, form, by known techniques.
  • the optimum amount of added salt or other compound can be found by experimentation. For many purposes it is in the range 0 to about 60% by weight based on the binder (below 0.1% and usually below 0.02% based on ore). In some instances amounts of from about 10 to about 30% based on soluble polymer are the most cost effective but usually greater amounts, for instance 30 to about 100% or even 150%, preferably 50 to 90%, based on soluble polymer are preferred.
  • the soluble polymer in bead or other form
  • cross linked polymers have proved, by themselves, to be unsatisfactory we find valuable results are achieved if a cross linked, swellable, particulate organic polymer is included with the soluble polymer.
  • the cross linked polymer must have a small particle size, below 100 ⁇ m and often below 50 ⁇ m. The size can be as small as is commercially available, e.g., down to 10 ⁇ m or 1 ⁇ m.
  • the particles are normally introduced as dry powder and preferably this powder is in the form of bead fines separated during the production of coarser particulate swellable polymer as produced by bead polymerisation.
  • the inclusion of the cross linked polymer particles can give surprisingly improved dry strength and drop number values and so a blend of soluble particles and cross linked particles can give an excellent combination of dry strength, wet strength and spalling properties. Also the pellets tend to have improved surface appearance, such as smoothness.
  • the cross linked polymer may be non-ionic (e.g., polyacrylamide), but when the soluble polymer is ionic it is preferably of the same ionic type as the soluble polymer and so may be formed from the same monomers as are discussed below for the preparation of the soluble polymer. Preferably 20 to 100% by weight, most preferably 60 to 100% by weight, are ionic. The use of homopolymer, e.g., cross linked sodium polyacrylate, is very satisfactory. Cross linking may be by any of the conventional cross linking agents used in the production of swellable or absorbent polymers.
  • cross linking agent may be by an ionic cross linking agent but is preferably covalent, e.g., methylene bis acrylamide or other polyethylenically unsaturated monomer.
  • the amount of cross linking agent is generally in the range 20 to 1,000 ppm, preferably 50 to 500 ppm, and must be such that the particles are insoluble but highly swellable in water, e.g., having a gel capacity in water above 50, and preferably above 200, grams per gram.
  • the amount of cross linked polymer particles may be relatively low, e.g., 10 to 30% based on soluble polymer, but generally greater amounts, e.g., up to 300% or even 600% based on soluble polymer are preferred. Amounts of 0 to 80% often 20 to 50%, based on total binder are suitable. Particularly preferred binders consist essentially of 1 part by weight soluble polymer, 0.3 to 1.5 parts by weight sodium carbonate or other added salt or simple compound, and 0.3 to 5 parts by weight cross linked anionic homopolymer or copolymer, with proportions of about 1:1:1 often being convenient.
  • substantially all the particles of the soluble polymer (and of other binder particles) must be below about 300 ⁇ m for good results, presumably since otherwise the particle size is too large to establish adequate contact with the very large number of very small iron ore particles.
  • Preferably substantially all the polymer particles are below about 200 and preferably below about 150 ⁇ m (microns). Although it might be expected to be necessary to have exceedingly small polymer particle size, similar to bentonite, this is unnecessary and it is satisfactory for most or all of the particles to be above 20 ⁇ m (microns). Best results are often achieved when substantially all the polymer particles are in the range 20 to 100 ⁇ m (microns) but a satisfactory fraction is 100% below about 200 ⁇ m and at least 50% below about 100 ⁇ m.
  • the amount is usually below about 0.2% and generally it is below about 0.1% (by weight based on the total mix). It is often preferred for the amount to be below 0.05% by weight, but amounts below 0.01% are usually inadequate except when the soluble polymer is used with significant (e.g., at least 20% by weight) other binder components. the amount of soluble polymer may then sometimes be reduced, e.g., to 0.005%.
  • the particle size of the ore is generally less than 250 microns, usually 90% or 80% by weight of the particles being less than 50 microns.
  • the ore is preferably an iron ore such as magnetite, haemetite or taconite, but can be any other mineral ore that needs to be put into the form of pellets, for instance a zinc ore. Satisfactory results can be obtained even if the ore is contaminated with clay.
  • the ore Before adding binder in the form of dry polymer, the ore usually already has the desired final moisture content of 5 to 15%, preferably 8 to 10%, by weight based on the weight of iron ore. This moisture content is the moisture as measured by heating up to 105°C. However if the ore is too dry then water may be added to it, e.g., before or after the addition of polymer binder (or the binder may be predissolved).
  • the binder can be blended with the ore in the same manner as bentonite is blended, preferably by scattering the polymer particles on to the ore as it is carried towards a mixer, for instance a paddle mixer provided with stators. It may be mixed for the same duration as when bentonite is used, for instance 2 to 20, generally about 10, minutes.
  • the damp blend of ore and polymer is converted to pellets in conventional manner, for instance by balling in conventional manner. This may be effected using a rotating tilting disc but generally is conducted in a balling drum.
  • the size of the pellets is generally from 5 to 16 mm, preferably 8 to 12 mm.
  • the resultant green pellets Before the resultant green pellets can be utilised for the production of metal they need to be fired, generally at a temperature up to above 1000°C, for instance up to 1200°C. For this purpose they can be introduced into a kiln or other firing apparatus and fired in conventional manner. It is desirable to be able to introduce them into this furnace at the highest possible inlet temperature with the minimum risk of spalling.
  • the inlet temperature at which spalling becomes significant can be referred to as the spalling temperature and a particular advantage of the invention is that it is possible to make pellets having a spalling temperature higher than can conveniently be obtained by the use of bentonite and other known binders.
  • binders were each scattered on to acidic moist particulate haematite iron ore at an appropriate dosage.
  • the moisture content was 8.3%.
  • the blend was then converted to pellets in a balling drum, the pellets having a size typically of about 5-16mm.
  • the following synthetic cationic polymeric binders were used. They were made by reverse phase polymerisation to a bead size below 200 ⁇ m and the beads were dried and separated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (12)

  1. Verfahren, in dem Pellets von Mineralerz hergestellt werden, indem säurehaltiges, aus Teilchen bestehendes Erz mit im wesentlichen allen Teilchen kleiner als 250 µm gebildet wird, und das einen pH-Wert in Wasser bis zu 6 hat, mittels eines Verfahrens, das umfasst, das Mineralerz in Säure zu waschen oder auszulaugen, ihm ein Bindemittel beizumengen, das organisches Polymer in dem säurehaltigen, aus Teilchen bestehenden Erz in der Gegenwart von 5 bis 15 Gewichts% Wasser (beruhend auf der ganzen Mischung) umfasst, um eine im wesentlichen homogene feuchte Mischung zu bilden und die feuchte Mischung zu pelletieren, und in dem das Bindemittel ungefähr 0,002 bis ungefähr 0,5 Gewichts% eines wasserlöslichen Polymers, das kationisch ist, beruhend auf der ganzen Mischung, umfasst.
  2. Verfahren nach Anspruch 1, in dem das Polymer synthetisch ist und von ethylenisch ungesättigten Monomeren gebildet ist, die ein kationisches Monomer umfassen.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, in dem das Mineralerz Eisenerz ist, das mit Säure gewaschen oder ausgelaugt ist.
  4. Verfahren nach Anspruch 3, in dem das kationische Polymer von Polymeren ausgewählt wird, die eine Grenzviskosität von 0,4 bis 5 dl/g haben, und die von Monomeren gebildet sind, von denen wenigstens 70 Gewichts% kationisch sind, und Polymeren, die eine Grenzviskosität von 3 bis 20 dl/g haben, und die durch Copolymerisation von 20 bis 75 Gewichtsprozent aus kationischem Monomer mit 80 bis 25 Gewichtsprozent aus nichtionischem Monomer gebildet sind.
  5. Verfahren nach Anspruch 3, in dem das kationische Polymer im wesentlichen ein Homopolymer mit einer Grenzviskosität von 0,4 bis 2 dl/g ist, wobei das kationische Monomer vorzugsweise von Diallyldimethylammoniumchlorid und quaternisierten Dialkylaminoalkyl(meth)acrylaten und quaternisierten Dialkylaminoalkyl(meth)acrylamiden ausgewählt wird.
  6. Verfahren nach Anspruch 3, in dem das kationische Polymer ein Copolymer von 25 bis 60 Gewichtsprozent aus kationischem Monomer 75 bis 40 Gewichtsprozxent Acrylamid ist, und eine Grenzviskosität in einem Bereich von 3 bis 12 dl/g hat.
  7. Verfahren nach Anspruch 3, in dem das kationische Polymer ein Copolymer von ungefähr 20 bis ungefähr 60 Gewichts% Acrylamid mit ungefähr 80 bis ungefähr 40 Gewichts% eines quaternisierten Monomers ist, das von Dialkylaminoalkyl(meth)acrylaten und Dialkylaminoalkyl(meth)acrylamiden ausgewählt wird und eine Grenzviskosität von 3 bis 12 dl/g hat.
  8. Verfahren nach einem der Ansprüche 3 bis 7, in dem das Polymer dem Erz als trockenes, frei fliessendes Pulver zugegeben wird, wobei im wesentlichen alle Teilchen grösser als 20 µm und kleiner als 300 µm sind.
  9. Verfahren nach einem der Ansprüche 3 bis 8, in dem das Polymer in Gestalt von Kügelchen zugegeben wird, die durch Umkehrphase-Suspensionspolymerisation hergestellt sind.
  10. Verfahren nach einem der vorhergehenden Ansprüche, in dem das Bindemittel eine Oberflächenspannung von ungefähr 70 10⁻⁵N/cm bei einer Konzentration bei 20°C von 0,075 Gewichts% in Wasser hat.
  11. Verfahren nach einem der vorhergehenden Ansprüche, in dem die Menge des Polymers zwischen 0,01 und 0,05 Gewichts% liegt.
  12. Verfahren nach einem der vorhergehenden Ansprüche, in dem wenigstens 70 Gewichts% des säurehaltigen, aus Teilchen bestehenden Erzes eine Teilchengrösse hat, die kleiner als 50 µm ist.
EP88302455A 1987-03-24 1988-03-21 Verfahren zum Pelletieren von Erzen Expired - Lifetime EP0288150B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB878706932A GB8706932D0 (en) 1987-03-24 1987-03-24 Ore pelletisation
GB8706932 1987-03-24
GB878712552A GB8712552D0 (en) 1987-05-28 1987-05-28 Ore pelletisation
GB8712552 1987-05-28

Publications (2)

Publication Number Publication Date
EP0288150A1 EP0288150A1 (de) 1988-10-26
EP0288150B1 true EP0288150B1 (de) 1994-02-23

Family

ID=26292050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88302455A Expired - Lifetime EP0288150B1 (de) 1987-03-24 1988-03-21 Verfahren zum Pelletieren von Erzen

Country Status (3)

Country Link
EP (1) EP0288150B1 (de)
AU (1) AU613351B2 (de)
CA (1) CA1319016C (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8830383D0 (en) * 1988-12-30 1989-03-01 Allied Colloids Ltd Process and composition for pelletising particulate materials
DD297773A5 (de) * 1989-02-13 1992-01-23 �����@������������������k�� Verfahren zum aufbereiten eisenhaltigen oelschlamms fuer die weiterverarbeitung
DD297772A5 (de) * 1989-02-13 1992-01-23 �����@������������������k�� Verfahren zum binden von partikelfoermigen abfaellen, wie staeube, metallabfaelle, fasern, papierabfaellen od. dgl. zu feststoffen
GB8918913D0 (en) * 1989-08-18 1989-09-27 Allied Colloids Ltd Agglomeration of particulate materials
US5685893A (en) * 1991-08-02 1997-11-11 Allied Colloids Limited Ore pelletization
GB9116700D0 (en) * 1991-08-02 1991-09-18 Allied Colloids Ltd Ore pelletisation
CA2082128C (en) 1991-11-07 2002-12-31 Henricus R. G. Steeghs Process for agglomerating particulate material and products made from such processes
GB9721085D0 (en) * 1997-10-03 1997-12-03 Allied Colloids Ltd Mineral palletisation
GB9724032D0 (en) * 1997-11-13 1998-01-14 Allied Colloids Ltd Ore pelletisation
EP2548978A1 (de) 2011-07-21 2013-01-23 Clariant S.A., Brazil Bindemittelzusammensetzung zur Agglomeration von Feinmineralien und Pelletierungsverfahren, der diese Zusammensetzung verwendet
UA123154C2 (uk) 2015-09-02 2021-02-24 Басф Се Застосування гідрофобно-асоційованих співполімерів як зв'язуючих речовин для пелетування руд, що містять метал
AU2018224267B2 (en) 2017-02-22 2023-06-29 Basf Se Use of copolymers as binders for pelletizing metal containing ores
GB201813370D0 (en) * 2018-08-16 2018-10-03 Binding Solutions Ltd Binder formulation
WO2021234759A1 (ja) * 2020-05-18 2021-11-25 日本製鉄株式会社 塊成物の製造方法および塊成物
FR3135993A1 (fr) 2022-05-24 2023-12-01 Snf Sa Composition liante pour l’agglomeration de minerais de fer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225171A2 (de) * 1985-11-29 1987-06-10 Ciba Specialty Chemicals Water Treatments Limited Pelletisierung von Eisenerzen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3180723A (en) * 1963-05-27 1965-04-27 Nalco Chemical Co Metallurgical process
US3860414A (en) * 1968-09-04 1975-01-14 Int Minerals & Chem Corp Use of graft copolymers as agglomeration binders
AU445417B2 (en) * 1970-08-07 1974-02-21 Catoleum Pty. Limited A process of manufacturing indurated mineral agglomerates
US3893847A (en) * 1970-08-07 1975-07-08 Catoleum Pty Ltd Composition of matter and process
DE2105932C3 (de) * 1971-02-09 1975-04-17 Bayer Ag, 5090 Leverkusen Agglomerieren von eisenhaltigen Titanerzen
US3925060A (en) * 1974-09-23 1975-12-09 Timken Co Compact containing iron oxide and carbon and method for its use in steelmaking
ZA774057B (en) * 1977-07-06 1978-09-27 Revertep South Africa Ltd Process and composition for aggregating particulate materials
ZA776166B (en) * 1977-10-17 1978-12-27 Revertex Ltd The treatment of particulate material to form aggregates
AU546359B2 (en) * 1980-12-08 1985-08-29 Revertex (South Africa) Pty. Ltd. Briquetting of particulate materials
US4690971A (en) * 1985-03-05 1987-09-01 Allied Colloids Limited Water absorbing polymers
CA1332514C (en) * 1985-05-21 1994-10-18 Meyer Robert Rosen Process for agglomerating mineral ore concentrate utilizing emulsions of polymer binders or dry polymer binders

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225171A2 (de) * 1985-11-29 1987-06-10 Ciba Specialty Chemicals Water Treatments Limited Pelletisierung von Eisenerzen

Also Published As

Publication number Publication date
CA1319016C (en) 1993-06-15
AU1370588A (en) 1988-09-22
EP0288150A1 (de) 1988-10-26
AU613351B2 (en) 1991-08-01

Similar Documents

Publication Publication Date Title
EP0225171B1 (de) Pelletisierung von Eisenerzen
EP0288150B1 (de) Verfahren zum Pelletieren von Erzen
US5171781A (en) Polymeric compositions
US4767449A (en) Process for agglomerating ore concentrate utilizing clay and dispersions of polymer binders or dry polymer binders
US4802914A (en) Process for agglomerating mineral ore concentrate utilizing dispersions of polymer binders or dry polymer binders
CA1339850C (en) Polymeric compositions
EP0413592B1 (de) Agglomerieren von Teilchen
EP3218526B1 (de) Bindemittelzusammensetzungen und verfahren zur herstellung von eisenerzpellets
EP0203854B1 (de) Verfahren zum Agglomerieren von Erzkonzentraten mittels Emulsionen von Polymerbindemitteln oder trockenen Polymerbindemitteln
US4728537A (en) Ore pelletization
EP0203855B1 (de) Verfahren zum Agglomerieren von Erzkonzentraten mittels Emulsionen von Polymerbindemitteln
EP1021573B1 (de) Pelletieren von mineralien
US6113844A (en) Process for pelletizing particulate materials
JPS60220135A (ja) 製鉄用粉原料の整粒化剤
CA2965693C (en) Binder compositions and processes of preparing iron ore pellets
MXPA00003246A (en) Mineral pelletisation

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT NL SE

RBV Designated contracting states (corrected)

Designated state(s): FR SE

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

17P Request for examination filed

Effective date: 19890425

17Q First examination report despatched

Effective date: 19910821

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): FR SE

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: SNF

Effective date: 19941123

EAL Se: european patent in force in sweden

Ref document number: 88302455.6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950309

Year of fee payment: 8

PLBL Opposition procedure terminated

Free format text: ORIGINAL CODE: EPIDOS OPPC

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961129

PLBM Termination of opposition procedure: date of legal effect published

Free format text: ORIGINAL CODE: 0009276

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION PROCEDURE CLOSED

27C Opposition proceedings terminated

Effective date: 19961031

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: CIBA SPECIALTY CHEMICALS WATER TREATMENTS LIMITED

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20070208

Year of fee payment: 20

EUG Se: european patent has lapsed