GB2143808A - Reclamation from steelworks dust - Google Patents
Reclamation from steelworks dust Download PDFInfo
- Publication number
- GB2143808A GB2143808A GB08320393A GB8320393A GB2143808A GB 2143808 A GB2143808 A GB 2143808A GB 08320393 A GB08320393 A GB 08320393A GB 8320393 A GB8320393 A GB 8320393A GB 2143808 A GB2143808 A GB 2143808A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slag
- dust
- cake
- filter cake
- crushing
- 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.)
- Withdrawn
Links
- 239000000428 dust Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 59
- 239000002893 slag Substances 0.000 claims abstract description 31
- 239000012065 filter cake Substances 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000009844 basic oxygen steelmaking Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 230000001143 conditioned effect Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 31
- 239000011236 particulate material Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000009628 steelmaking Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000006148 magnetic separator Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 claims 2
- 239000006227 byproduct Substances 0.000 abstract 1
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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
In a method for reclaiming iron-bearing dust generated during the basic oxygen steel making process, a moist filter cake produced conventionally and comprising the dust is brought into contact with roughly broken up partially cooled slag. The two by-products (cake and slag) are mixed and comminuted on the ground by running a tracked vehicle (or the like) to-and-fro over them. The thus conditioned cake and slag mixture is then treated in a substantially conventional scrap recovery plant.
Description
SPECIFICATION
Reclamation from steelworks dust
This invention relates to an industrial reclamation process for dealing with finely particulate material.
The invention is especially, but not exclusively, concerned with reclamation from dust produced in steel works.
During the blowing cycle of the basic oxygen steel making (BOS) process, a finely particulate dust is generated which is collected in a wet gas cleaning system associated with the steel making plant. In the gas cleaning system, the dust and water produce a slurry containing 60% to 70% moisture; and subsequent to a filtering process the dust-and-water component is reduced to a filter cake containing approximately 30% moisture. The consistency of the filter cake, due to the fineness of the dust particles, is that of a wet clay.
Since the filter cake is rich in iron, several methods have previously been proposed for the drying and recovery processing of the cake, but these have proved unsuccessful due mainly to the practical and economic disadvantages in handling and drying the filter cake material.
An object of the present invention is to provide an improved reclamation process for dealing with finely particulate material such as the mentioned filter cake.
According to the present invention there is provided an industrial reclamation process for dealing with finely particulate material, comprising the steps of obtaining a moist cake of the particulate material, bringing the moist cake into contact with a hot friable material, and subjecting both said materials to a crushing and mixing process.
Preferably, the said hot friable material is a slag produced by a basic oxygen steel making process.
Preferably, the said moist cake is a filter cake of dust collected from a basic oxygen steel making process.
Preferably, the said crushing and mixing process is effected by running a heavy vehicle to-and-fro over the moist cake and the hot friable material.
Preferably, the said heavy vehicle is a tracked vehicle.
The crushing and mixing process results in a comminution of the friable material in the course of which the moist cake is distributed and dried on the surfaces of pieces of the friable material utilising heat energy in the latter.
The moist cake and the friable material mixture assumes the consistency of gritty soil which is amenable to treatment in a scrap recovery plant.
In one example of an industrial reclamation process embodying the present invention, iron rich dust generated during the blowing cycle of a basic oxygen steel making plant is collected in a wet gas cleaning system associated with the plant. The gas cleaning system produces a filter cake consisting of the dust and 30% moisture.
From the same steel making process, slag is tapped from the steel making vessel and poured to form plate-like beds. It is customary to form a slag bed in layers by successive slag tapping. The slag bed is broken up roughly by mechanical shovel and the broken slag moved to another area of ground.
In order to effect the reclamation process, the moist filter cake is added to the partially cooled and broken slag and both materials are then subjected to a crushing and mixing process by means of running a tracked vehicle to-and-fro over them.
The friable nature of the slag results in its further comminution and in the simultaneous mixing in of the filter cake which has a consistency of wet clay.
The moist cake material is distributed on the surfaces of pieces of the slag the heat in which dries off the moisture in the filter cake leaving the dust residue thoroughly mixed with the comminuted slag material. The final consistency of the mixture is that of gritty soil.
The conditioned cake and slag mixture is treated in a substantially conventional scrap recovery plant. By means of a magnetic separator and a series of screens, the magnetic fraction of the dust and slag mixture is separated. The non-magnetic fraction is screened finally at 1/4 inch mesh the pass-through fraction of which is recovered. The recovered dust is transferred to ore handling plant for re-use.
By utilising the heat content of the slag, and by avoiding the cost of disposing of the filter cake as a waste material and by the value in reclaiming the iron content of the dust, the industrial reclamation process described is capable of effecting very considerable economies.
It is envisaged that the industrial reclamation process in accordance with the present invention may be used in the handling of other finely particulate materials capable of collection with water to form a clay-like filter cake.
It is further envisaged that the crushing and mixing process may be effected by means of a crushing and mixing machine designed specifically for the particular materials concerned.
CLAIMS.
1. An industrial reclamation process for dealing with finely particulate material, comprising the steps of obtaining a moist cake of the particulate material, bringing the moist cake into contact with a hot friable material, and subjecting both said materials to a crushing and mixing process.
2. An industrial reclamation process according to claim 1, wherein the said hot friable material is a slag produced by a basic oxygen steel making process.
3. An industrial reclamation process according to claim 1 or 2, wherein the said moist cake is a filter cake of dust collected from a basic oxygen steel making process.
4. An industrial reclamation process according to any one of the preceding claims, wherein the said crushing and mixing process is effected by running a heavy vehicle to-and-fro over the moist cake and the hot friable material.
5. An industrial reclamation process according
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. An industrial reclamation process for dealing with finely particulate material, comprising the steps of obtaining a moist cake of the particulate material, bringing the moist cake into contact with a hot friable material, and subjecting both said materials to a crushing and mixing process.
2. An industrial reclamation process according to claim 1, wherein the said hot friable material is a slag produced by a basic oxygen steel making process.
3. An industrial reclamation process according to claim 1 or 2, wherein the said moist cake is a filter cake of dust collected from a basic oxygen steel making process.
4. An industrial reclamation process according to any one of the preceding claims, wherein the said crushing and mixing process is effected by running a heavy vehicle to-and-fro over the moist cake and the hot friable material.
5. An industrial reclamation process according to claim 4, wherein the said heavy vehicle is a tracked vehicle.
6. An industrial reclamation process according to any one of the preceding claims, including the step of subjecting the product of the crushing and mixing process to a further process for mutually separating components of said product.
7. Any material being a component obtained by the process of claim 6.
8. An industrial reclamation process for dealing with finely particulate material, substantially as hereinbefore described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08320393A GB2143808A (en) | 1983-07-28 | 1983-07-28 | Reclamation from steelworks dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08320393A GB2143808A (en) | 1983-07-28 | 1983-07-28 | Reclamation from steelworks dust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8320393D0 GB8320393D0 (en) | 1983-09-01 |
| GB2143808A true GB2143808A (en) | 1985-02-20 |
Family
ID=10546447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08320393A Withdrawn GB2143808A (en) | 1983-07-28 | 1983-07-28 | Reclamation from steelworks dust |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2143808A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2180013C1 (en) * | 2000-07-17 | 2002-02-27 | Гаврилин Игорь Васильевич | Process of remelting of dust-like silicon waste in medium of solid-liquid aluminum |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB849172A (en) * | 1957-07-23 | 1960-09-21 | Columbia Southern Chem Corp | Process of treating metal halides |
| GB1410196A (en) * | 1971-12-23 | 1975-10-15 | Almasfuezitoei Timfoeldgyar | Method of and apparatus for calcining moist and sticky materials |
-
1983
- 1983-07-28 GB GB08320393A patent/GB2143808A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB849172A (en) * | 1957-07-23 | 1960-09-21 | Columbia Southern Chem Corp | Process of treating metal halides |
| GB1410196A (en) * | 1971-12-23 | 1975-10-15 | Almasfuezitoei Timfoeldgyar | Method of and apparatus for calcining moist and sticky materials |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2180013C1 (en) * | 2000-07-17 | 2002-02-27 | Гаврилин Игорь Васильевич | Process of remelting of dust-like silicon waste in medium of solid-liquid aluminum |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8320393D0 (en) | 1983-09-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |