CN1147558A - Method of nodulizing converter flyash for iron-smelting - Google Patents
Method of nodulizing converter flyash for iron-smelting Download PDFInfo
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- CN1147558A CN1147558A CN 96108828 CN96108828A CN1147558A CN 1147558 A CN1147558 A CN 1147558A CN 96108828 CN96108828 CN 96108828 CN 96108828 A CN96108828 A CN 96108828A CN 1147558 A CN1147558 A CN 1147558A
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- CN
- China
- Prior art keywords
- flyash
- converter
- iron
- spheroid
- smelting
- 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.)
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- 239000010881 fly ash Substances 0.000 title claims abstract description 35
- 238000003723 Smelting Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052742 iron Inorganic materials 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000004927 clay Substances 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 3
- 239000000920 calcium hydroxide Substances 0.000 abstract description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 3
- 239000000378 calcium silicate Substances 0.000 abstract 1
- 229910052918 calcium silicate Inorganic materials 0.000 abstract 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 35
- 239000011575 calcium Substances 0.000 description 9
- 229960005191 ferric oxide Drugs 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 9
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229960001866 silicon dioxide Drugs 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 description 1
- 235000019402 calcium peroxide Nutrition 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Converter flyash, silicon dioxide and calcium hydroxide are mixed in a certain proportion and nodulized through pressure and the nodules with Rockwell hardness 2-2.5 are used in iron smelting and producing calcium silicate as cement material. The present invention can solve the problem of converter flyash pollution, recover iron in flyash through common iron smelting and provide cement material.
Description
The present invention relates to method to converter flyash processing technology field, particularly a kind of nodulizing converter flyash for iron-smelting.
Converter flyash is a large amount of chimney flying dusts that Steel Plant produce when spraying oxygen in convertor steelmaking process, for the black dust, environment is caused severe contamination.Usually each Steel Plant adopts water pouring method to handle these flying dusts, be that the converter flyash of carrier is discharged into that precipitation becomes mud shape colloid lime-ash near the converter the sewage lagoon with water, then, draw up pool side aperiodically, transport elsewhere to and bury, environment is caused severe contamination.The composition of converter flyash is generally: the oxide compound 50-57% of iron, and silicon-dioxide 7.5%, calcium oxide 8.8% reaches elements such as other a spot of carbon, phosphorus, sulphur, aluminium.Though each Steel Plant has all dropped into a large amount of human and material resources, financial resources, fail to solve this difficult problem of processing converter flyash all the time.
Chinese patent application number is 94101607.2, disclose reductive agent carbon and fusing assistant unslaked lime, river sand and flying dust have quantitatively been mixed, directly above-mentioned flying dust compound is joined in the electric furnace (or open hearth), utilize in the stove 1400 ℃ of-1700 ℃ of high temperature to make the series of physical chemical transformation takes place between the raw material, to reach the purpose of reduction refining Cheng Gang.Above-mentioned patent application exists following problem: 1. do not disclose the proportioning of each composition of flying dust compound in this application for a patent for invention file fully, belong to impracticable technical scheme; Even 2. technique scheme is selected suitable proportioning, also can only under laboratory condition, with single stage method flying dust be refined into high carbon steel with muffle furnace.This is that a large amount of carbons of flying dust compound generate CO gas under electrothermal high-temperature anoxybiotic situation because muffle furnace is to adopt electrically heated closed melting, and the oxide compound of iron is reduced into fe.Afterwards, under 1500 ℃ of left and right sides high temperature, the iron that has absorbed carbon has become high carbon steel (liquid state).As can be seen, containing a large amount of carbons in closed melting and the flying dust compound is the underlying condition that realizes technique scheme.Because electric furnace and open hearth are style of opening, open hearth will be dried combustion-supporting, and the carbon in the flying dust compound is met heat and generated carbonic acid gas and can blow away with air, can not generate CO gas the oxide compound of iron is reduced into iron.And during electrosmelting, oxygen blast, also can not generate CO gas.Therefore, can not go to implement technique scheme with open hearth or electric furnace.Except that breadboard muffle furnace, other type of furnaces also all can not realize flying dust single stage method Cheng Gang.There is not industrial production to be worth with the laboratory muffle furnace to flying dust single stage method Cheng Gang.3. annotate as concrete technology side, the compound of being made up of flying dust, carbon, unslaked lime, river sand directly joins in the electric furnace (or open hearth), material stops up mutually in the stove, airtight, thereby, can not finish the series of physical chemical reaction process smoothly, also just can't reach the purpose of reduction refining.
The inventor has carried out research in depth, has overcome the above-mentioned problems in the prior art.
The object of the present invention is to provide a kind of method of nodulizing converter flyash for iron-smelting.
Another object of the present invention is just converter flyash compound spheroid to be refined raw material---the Calucium Silicate powder that taps a blast furnace and produce cement with conventional iron smelting method, and having completely, industrial production is worth.
Another object of the present invention also is thoroughly to solve converter flyash to the severe contamination problem that environment causes, and turns bane into boon.
The object of the present invention is achieved like this: a kind of method of nodulizing converter flyash for iron-smelting comprises at first being converter flyash and the SiO of 4-6% with water content
2, Ca (OH)
2Mix into compound thoroughly by following proportioning (weight percent) mixing: water content is that the converter flyash of 4-6% is 85-95% (weight), SiO
2Be 2-10% (weight) Ca (OH)
2Be 3-5% (weight); Again above-mentioned compound is pressurizeed into spheroid, its durometer level is Rockwell hardness 2-2.5; Adopt conventional iron smelting method, above-mentioned converter flyash compound spheroid is refined into raw material---the Calucium Silicate powder of iron and production cement.
As one of optimum implementation, can be at converter flyash and SiQ
2, Ca (OH)
2Add yellow clay 3-5% (weight) in the compound, then, mix thoroughly and pressurize into spheroid.
Described converter flyash compound spheroid is spherosome or oval ball.The diameter range of above-mentioned spheroid is 2-10 centimetre.
Flying dust is the muddy powder-type, and moisture content is many and viscosity is big, airtight.When dry is powder, and major part is oxidized to ferric oxide when meeting high temperature, and volume is lighter, can not reduce, and as glomeration not, then is difficult to smelt in stove.Because flying dust is siliceous and the calcium constituent deficiency, in the slag making stage, promptly under interior 1100 ℃ of-1200 ℃ of hot conditionss of stove, can not form slag in iron molecule and the reaction of carbon monoxide process, iron molecule can not separate with impurity.So need to add a certain amount of silicon-dioxide and calcium hydroxide to flying dust, so, can reduce the fusing point of ferric oxide, strengthen its hardness in the time of also making the flying dust spheroid meet atmospheric oxidation, reduce damaged degree, help abundant burning.
The main chemical of yellow clay is clay, ferric oxide, silicon-dioxide, calcium dioxide, can make the flying dust spheroid bond better after adding yellow clay, improve its hardness, in fusion process, can reduce the ferric oxide fusing point, remove the Sauerstoffatom of ferric oxide, quicken its reduction process.
The invention has the advantages that thoroughly to solve converter flyash, turn bane into boon the severe contamination problem that environment causes; Only need with general blast furnace simultaneously, adopt conventional iron smelting method just the converter flyash ball can be refined raw material---the Calucium Silicate powder that reclaims its whole iron and produce cement.Thereby the positively effect that the present invention produced is conspicuous.
By following embodiment the present invention is further elaborated.
Embodiment 1:
With water content is 4% converter flyash 95% (weight), SiO
22% (weight), Ca (OH)
2After compound is mixed in 3% (weight) mixing thoroughly, be pressed into oval-shaped ball with the drum-type ball press, its Rockwell hardness reaches 2.5, and the flying dust sphere diameter is in the 4-6 cm range.In blast furnace, can bear material pressure and can be broken, thereby, the burning of ventilating in the stove can not influenced.Can obtain enough CO gas and iron molecule and play reduction reaction.Output is that flying dust spheroid per ton can refine into 500 kilograms of iron, and remaining slag Calucium Silicate powder is cement producting material.
Embodiment 2:
With water content is 5% converter flyash 90% (weight), SiO
26% (weight), Ca (OH)
2After compound is mixed in 4% (weight) mixing thoroughly, be pressed into oval-shaped ball with the drum-type ball press, its Rockwell hardness is 2.2, and the flying dust sphere diameter is in the 6-10 cm range.Output is that flying dust spheroid per ton can refine into 480 kilograms of iron, and remainder is a Calucium Silicate powder.Add 6% silicon oxide and 4% calcium hydroxide, though can not have influence on the reduction of iron molecule, compare with embodiment 1, the present embodiment cost is high slightly, iron output is low slightly.
Embodiment 3:
With water content is 6% converter flyash 85% (weight), SiO
210% (weight), Ca (OH)
2After compound is mixed in 5% (weight) mixing thoroughly, be pressed into circular spheroid with the drum-type ball press, its Rockwell hardness is 2, and the flying dust sphere diameter is in the 2-4 cm range.Output is that flying dust spheroid per ton can refine into 450 kilograms of iron.
Embodiment 4:
With water content is 4% converter flyash 92% (weight), SiO
22% (weight), Ca (OH)
2After 3% (weight) and yellow clay 3% (weight) are mixed thoroughly, be pressed into oval-shaped ball with the drum-type ball press, its Rockwell hardness reaches 2.5, and in the flying dust sphere diameter 6-10 cm range, output is that flying dust spheroid per ton can refine into 480 kilograms of iron.Because of yellow clay is made up of multiple oxide compound, in high-temperature atmosphere, CO gas and yellow clay participate in chemical reaction together, remove the Sauerstoffatom in the ferric oxide in the flying dust, quicken its reduction process, and reduce its fusing point.Compare with embodiment 1, its cost has increased some, the iron output of flying dust spheroid per ton has also reduced some, but in smelting process, because of having reduced the ferric oxide fusing point, thereby, save fuel, and shortened every stove tap to tap time, so, comparatively speaking, above-mentioned three embodiment of its actual rate ratio want high.
Embodiment 5:
With water content is 6% converter flyash 8O% (weight), SiO
210% (weight), Ca (OH)
2After 5% (weight) and yellow clay 5% (weight) are mixed thoroughly, be pressed into oval-shaped ball with the drum-type ball press, its Rockwell hardness reaches 2.5.Flying dust spheroid iron output per ton is 400 kilograms.In smelting process, because flying dust proportion in the raw material total amount reduces, promptly iron level is low, so slag is corresponding to be increased, iron output is will corresponding reduction a little.
In smelting process, flying dust spheroid Rockwell hardness only need remain in the 2-2.5 scope, like this, just can not influence the reduction reaction program in the blast furnace.Geometrical shape to the flying dust spheroid does not have particular requirement, we can say, the flying dust spheroid of what shape can, but preferably oval or circular spheroid because the drum-type ball press extrudes oval-shaped ball and implements easily, output is also big.The flying dust sphere diameter is fit in the 2-10 cm range.If the flying dust sphere diameter is below 2 centimetres the time, in blast furnace, spheroid and fuel (coke or coal cinder) are disproportionate, stop up fuel gap in the stove easily, thereby, influence ventilate and stove in reducing program normally.When the flying dust sphere diameter more than 10 centimetres the time, because of heat in the blast furnace can not satisfy the required heat of flying dust spheroid fusion, spheroid internal oxidation iron does not reach fusing point, thereby, influenced the reduction of ferric oxide.
Method of the present invention is that iron is refined in the converter flyash balling-up, afterwards, and with conventional method for making steel, add the required metallic element of various steel, just can be refined into various steel grades with refining the iron that is obtained, product diversification can be satisfied the various needs on the industrial production.
Claims (4)
1, a kind of method of nodulizing converter flyash for iron-smelting comprises:
(1) with water content is converter flyash and the SiO of 4-6%
2, Ca (OH)
2Mix into compound thoroughly by following proportioning (weight percent) mixing:
Water content is the converter flyash .85-95% of 4-6%,
SiO
2?2-10％，Ca(OH)
2?3-5％；
(2) above-mentioned compound is pressurizeed into spheroid, its Rockwell hardness is 2-2.5;
(3) adopt conventional iron smelting method, above-mentioned converter flyash compound spheroid is refined into raw material--the Calucium Silicate powder of iron and production cement.
2, the method for nodulizing converter flyash for iron-smelting according to claim 1 is characterized in that adding yellow clay 3-5% (weight), pressurizes into spheroid after mixing thoroughly.
3, the method for nodulizing converter flyash for iron-smelting according to claim 1 and 2 is characterized in that described spheroid is spherosome or oval ball.
4, the method for nodulizing converter flyash for iron-smelting according to claim 3, the diameter range that it is characterized in that described spheroid is 2-10 centimetre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96108828 CN1147558A (en) | 1996-07-06 | 1996-07-06 | Method of nodulizing converter flyash for iron-smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96108828 CN1147558A (en) | 1996-07-06 | 1996-07-06 | Method of nodulizing converter flyash for iron-smelting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1147558A true CN1147558A (en) | 1997-04-16 |
Family
ID=5120119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96108828 Pending CN1147558A (en) | 1996-07-06 | 1996-07-06 | Method of nodulizing converter flyash for iron-smelting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1147558A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648097B (en) * | 2003-12-26 | 2010-06-02 | 韩国建设技术研究院 | Crystallized artificial marble produced from incineration ash and its production method |
-
1996
- 1996-07-06 CN CN 96108828 patent/CN1147558A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648097B (en) * | 2003-12-26 | 2010-06-02 | 韩国建设技术研究院 | Crystallized artificial marble produced from incineration ash and its production method |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
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