CN104087709A - Method for smelting and reducing high-chromium slag in induction furnace - Google Patents
Method for smelting and reducing high-chromium slag in induction furnace Download PDFInfo
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- CN104087709A CN104087709A CN201410344361.8A CN201410344361A CN104087709A CN 104087709 A CN104087709 A CN 104087709A CN 201410344361 A CN201410344361 A CN 201410344361A CN 104087709 A CN104087709 A CN 104087709A
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- chromium slag
- chromium
- high chromium
- slag
- melting
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- 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
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- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a method for smelting and reducing high-chromium slag in an induction furnace. The method is characterized by comprising the following steps: mixing the high-chromium slag with a smelting reduction agent, adding the mixture into molten iron in the induction furnace, blowing inert gas, and reducing chromium in the high-chromium slag into metal chromium to obtain chromium-containing molten steel. The method for smelting and reducing the high-chromium slag in the induction furnace, which is disclosed by the invention, can be used for removing the high-chromium slag and performing alloying by using noble metal chromium in the high-chromium slag, is convenient to operate, and is green and environment-friendly in high-chromium slag treatment and good in economic benefit.
Description
Technical field
The invention belongs to chromic wastes disposal field, relate to a kind of in induction furnace the method for the high chromium slag of melting and reducing.
Background technology
The elements such as high chromium slag results from converter extracting vanadium-vanadium factory, is a kind of microgranular fine powder, and it results from vanadium extracting process, the valuable chromium wherein containing also have toxicity because containing water-soluble sexavalent chrome, environmentally harmful element, difficult treatment.
The main component of described high chromium slag is as shown in table 1.
The high chromium slag ingredient table of table 1 (wt%)
| Composition | Cr 2O 3 | MnO | P | V 2O 5 | SiO 2 | TFe | K 2O | Na 2O |
| Content | 40～60 | 0.1～2.0 | 0.020～0.10 | 5.0～1.20 | 8～14 | 3～5 | 0.12～0.20 | 3.0～4.0 |
Chromic leaching in landfill, chromium slag after prior art has chromic slag harmlessness to process to the treatment process of chromium slag, chromium, the blast furnace of dissolving in chromium slag are processed chromium slag etc. without poisoning.Need to carry out harmless treatment to chromium slag but chromic slag harmlessness is processed rear landfill, treatment process has dry method reduction, wet reducing etc., and its complicated operation is had any problem in batches; In chromium slag, the residue of chromic leaching still needs landfill; The chromium of dissolving in chromium slag, fully utilizes it, brickmaking, do fused(calcium magnesium)phosphate, cast stone, making cement mineralizer, chromium slag substitute rhombspar do sintering cast iron, with the attached burning chromium residue detoxifying of cyclone furnace, for glass colorant etc.And blast furnace is without poisoning, to process chromium slag be without poisoning to process high chromium slag by metallurgy sintered and blast furnace, exactly high chromium slag is added to agglomeration in blast furnace burden, add afterwards the part chromium slag of dissolving in blast furnace, its concrete technology is (Fig. 1 is that blast furnace is without poisoning the process flow sheet of processing chromium slag) as shown in Figure 1.
But these chromic wastes disposal technology all have some limitations, some removing toxic substances are not thorough, have secondary pollution; Some chromium slag consumptions are few, and the disposal cycle is long, and progress is slow.Domestic air storage and the landfill disposal of generally adopting at present, indivedual factories directly enter the metallurgy sintered material that mixes by chromium slag and carry out sintering removing toxic substances.
CN102864311 discloses that in a kind of high chromium slag, chromium is at the recovery method of steel-making-LF operation, and it comprises following step: (1), by dry high chromium slag and carbon dust composition mixture, wherein the ratio of high chromium slag and carbon dust is that 10:1 is between 20:1; (2) during tapping ladle arrival LF station from converter steelmaking, dry mixture is added in ladle; (3) be blown into stirring of inert gas and in LF heating, in high temperature reduction atmosphere, the sexavalent chrome in heavy chromium slag be reduced into chromium metal in molten steel to the molten steel in ladle.LF stove directly carries out steelmaking alloy with heavy chromium slag smelting reduction process to chrome-bearing steel and refers in smelting process, the mixture of dry heavy chromium slag and reductive agent is directly added in deoxidation and partially-alloyed ladle, in LF, utilize its high temperature, agitation condition and reducing atmosphere, make the chromium element in heavy chromium slag be reduced out, to reach the element alloyed object of chromium.But although this technology is all right to the treatment effect of high chromium slag, due to the output of high chromium slag with respect to STEELMAKING PRODUCTION chrome-bearing steel very little, be unfavorable for producing and steadily carry out.
Therefore, this area need to a kind ofly can, in the high chromium slag of dissolving, utilize the method for precious metal chromium wherein, and the method has easy to operate, the processing environmental protection of high chromium slag, and good in economic efficiency feature.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention be to provide a kind of in induction furnace the method for the high chromium slag of melting and reducing, described method can be in the high chromium slag of dissolving, utilize precious metal chromium wherein to carry out alloy, have easy to operate, process environmental protection, and good in economic efficiency advantage.
Particularly, the present invention is achieved through the following technical solutions:
A method for the high chromium slag of melting and reducing in induction furnace, described method is that high chromium slag is mixed with melting and reducing agent, adds in induction furnace molten iron, is then blown into rare gas element, and the chromium in high chromium slag is reduced to chromium metal, obtains chrome-bearing steel liquid.
Provided by the invention in induction furnace the process flow sheet of the method for the high chromium slag of melting and reducing as shown in Fig. 2 (Fig. 2 is the process flow sheet of the high chromium slag of melting and reducing in induction furnace).
High chromium slag of the present invention is to sexavalent chrome slag.
Chromium is one of most important alloying element in STEELMAKING PRODUCTION, conventionally adds in people's molten steel with the form of ferrochrome, to meet different requirements of smelting steel grades.The present invention utilizes the C dissolving in the reductive agents such as carbon in steel [C] and high chromium slag
(S)deng deoxidant element to the Cr in chromium slag
2o
3reduce, the Cr restoring enters molten steel as beneficial element, obtains aluminium alloy, and principal reaction is:
(Cr
2O
3)+3C
(S)＝2Cr+3CO △G
0＝787740-558.97T J·mol
-1
(Cr
2O
3)+3[C]＝2Cr+3CO △G
0＝719970-462.19T J·mol
-1
More than reaction is heat absorption reflection, and what the continuous heating of induction furnace and reducing atmosphere were conducive to reflect continues to carry out.
Melting and reducing agent of the present invention is selected from the combination of any a kind or at least 2 kinds in carbon dust, ferrosilicon powder or aluminium powder, preferably carbon dust.The typical but non-limiting combination that comprises carbon dust and aluminium powder of combination of described melting and reducing agent, the combination of ferrosilicon powder and aluminium powder, the combination of carbon dust, ferrosilicon powder and aluminium powder etc.
On ferrochrome is produced, lt molten iron adds the ferrochrome of 1kg75%, can restore about 1.86kg chromium; Make reductive agent with carbon, lt molten iron adds 1kg carbon, can restore about 2.89kg chromium; 1t molten iron adds 1kg aluminium can restore about 1.93kg chromium.This shows, the reducing power of carbon is stronger, and low price, is easy to obtain in a large number; In addition, along with temperature raises, the reducing power of carbon strengthens obviously, from thermomechanical analysis, make reductive agent with carbon and chrome ore can be reduced, possess the condition of DIRECT ALLOYING, therefore, weigh from reducing power and economic angle, adopting carbon is most suitable as the melting and reducing agent of high chromium slag.The preferred carbon of the present invention is as preferred melting and reducing agent.
Preferably, the mass ratio that described high chromium slag mixes with melting and reducing agent is 9:(0～1).Wherein, the mass ratio that described high chromium slag mixes with melting and reducing agent does not comprise the point value of 9:0.
Preferably, described high chromium slag is 1:(5～9 with the mass ratio of the molten iron adding), such as 1:6,1:7,1:8 etc.
Preferably, the intake of described rare gas element is 2.5～5 cubes of ms/h of ton steel;
Preferably, described rare gas element is selected from helium and/or argon gas, preferably argon gas.
Preferably, the temperature of described reduction is higher than more than 1600 DEG C.
Preferably, in described high chromium slag, with Cr
2o
3meter, the content of chromium is 40～60w%.
In the present invention, after obtaining chrome-bearing steel liquid, in order to reach target alloy, alternatively, in chrome-bearing steel liquid, add alloyed metal element, realize alloying.
For example, can be according in chromium content and target ferrochrome, the difference of the content of chromium, iron is added part ferrochrome; Or according in chromium manganese steel, the content of chromium, manganese, steel adds the elements such as corresponding chromium, manganese, iron in aluminium alloy.Described alloyed metal element refers to the metallic element that can form alloy.
Preferably, described alloy comprises any one or more the combination in ferrochrome, ferromanganese, ferro-aluminum, molybdenum-iron.
As optimal technical scheme, of the present invention in induction furnace the method for the high chromium slag of melting and reducing comprise the steps:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust;
(2) add the molten iron of 5～9 times of high chromium slag amounts;
(3) be blown into rare gas element, the chromium in high chromium slag is reduced to chromium metal, obtain chrome-bearing steel liquid;
Alternatively, step (3) is carried out afterwards:
(4) in chrome-bearing steel liquid, add alloyed metal element, realize molten steel alloying.
Wherein, the amount of the described alloyed metal element to adding in chrome-bearing steel liquid of step (4) is added according to the amount of target component, for example need to prepare ferro-molybdenum, need to add the composition requirement of target-ferro-molybdenum in chrome-bearing steel liquid, add corresponding metallic element.
Compared with prior art, the present invention has following beneficial effect:
Provided by the invention in induction furnace the method for the high chromium slag of melting and reducing, can, in the high chromium slag of dissolving, utilize precious metal chromium wherein, little in batches, and easy to operate, the processing environmental protection of high chromium slag, good in economic efficiency.
Brief description of the drawings
Fig. 1 be in prior art blast furnace without poisoning the process flow sheet of processing chromium slag;
Fig. 2 is the process flow sheet of the high chromium slag of melting and reducing in induction furnace.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment helps to understand the present invention, should not be considered as concrete restriction of the present invention.
Embodiment 1
A method for the high chromium slag of melting and reducing in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:0.5 with carbon dust; In described high chromium slag, with Cr
2o
3meter, the content of chromium is 40～60w%
(2) add the molten iron of 8 times of high chromium slag amounts;
(3) at 1600 DEG C of temperature, be blown into the rare gas element of 3.5 cubes of ms/h of ton steel, the chromium in high chromium slag is reduced to chromium metal, obtain chrome-bearing steel liquid;
Alternatively, step (3) is carried out afterwards:
(4) according to the target component of molten steel, in chrome-bearing steel liquid, add alloying element, realize alloying.
Embodiment 2
A method for the high chromium slag of melting and reducing in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:0.1 with carbon dust; In described high chromium slag, with Cr
2o
3meter, the content of chromium is 40～60w%
(2) add the molten iron of 9 times of high chromium slag amounts;
(3) at 1700 DEG C, be blown into the rare gas element of 4.5 cubes of ms/h of ton steel amounts, the chromium in high chromium slag is reduced to chromium metal, obtain chrome-bearing steel liquid;
Alternatively, step (3) is carried out afterwards:
(4) according to the target component of molten steel, in chrome-bearing steel liquid, add alloying element, realize alloying.
Embodiment 3
A method for the high chromium slag of melting and reducing in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust; In described high chromium slag, with Cr
2o
3meter, the content of chromium is 40～60w%
(2) add the molten iron of 8.5 times of high chromium slag amounts;
(3) at 1640 DEG C, be blown into the rare gas element of 5 cubes of ms/h of ton steel amounts, the chromium in high chromium slag is reduced to chromium metal, obtain chrome-bearing steel liquid;
Alternatively, step (3) is carried out afterwards:
(4) according to the target component of molten steel, in chrome-bearing steel liquid, add alloying element, realize alloying.
Embodiment 4
A method for the high chromium slag of melting and reducing in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust; In described high chromium slag, with Cr
2o
3meter, the content of chromium is 40～60w%
(2) add the molten iron of 5 times of high chromium slag amounts;
(3) at 1640 DEG C, be blown into the rare gas element of 2.5 cubes of ms/h of ton steel amounts, the chromium in high chromium slag is reduced to chromium metal, obtain chrome-bearing steel liquid;
Alternatively, step (3) is carried out afterwards:
(4) according to the target component of molten steel, in chrome-bearing steel liquid, add alloying element, realize alloying.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, and the selections of the equivalence replacement to the each raw material of product of the present invention and the interpolation of ancillary component, concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (8)
1. a method for chromium in the high chromium slag of melting and reducing in induction furnace, is characterized in that, described method is that high chromium slag is mixed with melting and reducing agent, add in induction furnace molten iron, then be blown into rare gas element, the chromium in high chromium slag is reduced to chromium metal, obtain chrome-bearing steel liquid.
2. the method for claim 1, is characterized in that, described melting and reducing agent is selected from the combination of any a kind or at least 2 kinds in carbon dust, ferrosilicon powder or aluminium powder, preferably carbon dust.
3. method as claimed in claim 1 or 2, is characterized in that, the mass ratio that described high chromium slag mixes with melting and reducing agent is 9:(0～1).
4. the method as described in one of claim 1～3, is characterized in that, described high chromium slag is 1:(5～9 with the mass ratio of the molten iron adding).
5. the method as described in one of claim 1～4, is characterized in that, the intake of described rare gas element is 2.5～5 cubes of ms/h of ton steel;
Preferably, described rare gas element is selected from helium and/or argon gas, preferably argon gas;
Preferably, the temperature of described reduction is more than 1600 DEG C, preferably 1600～1700 DEG C.
6. the method as described in one of claim 1～5, is characterized in that, in described high chromium slag, with Cr
2o
3meter, the content of chromium is 40～60w%.
7. the method as described in one of claim 1～6, is characterized in that, alternatively, in chrome-bearing steel liquid, adds alloyed metal element, realizes alloying;
Preferably, described alloy comprises the combination of any a kind or at least 2 kinds in ferrochrome, ferromanganese, ferro-aluminum, molybdenum-iron.
8. the method as described in one of claim 1～7, is characterized in that, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust;
(2) add the molten iron of 5～9 times of high chromium slag amounts;
(3) be blown into rare gas element, the chromium in high chromium slag is reduced to chromium metal, obtain ferrochrome liquid;
Alternatively, step (3) is carried out afterwards:
(4) in chrome-bearing steel liquid, add alloyed metal element, realize alloying.
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|---|---|---|---|
| CN201410344361.8A CN104087709B (en) | 2014-07-18 | 2014-07-18 | A kind of method of melting and reducing height chromium slag in induction furnace |
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| CN201410344361.8A CN104087709B (en) | 2014-07-18 | 2014-07-18 | A kind of method of melting and reducing height chromium slag in induction furnace |
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| CN104087709A true CN104087709A (en) | 2014-10-08 |
| CN104087709B CN104087709B (en) | 2016-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048122A (en) * | 2016-08-19 | 2016-10-26 | 东北大学 | Method for reduced treatment of nickel residue through slag bath |
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| JPS54158313A (en) * | 1978-06-03 | 1979-12-14 | Nippon Steel Corp | Chromium removing method for chromium-containing slag |
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| US20060196308A1 (en) * | 2003-05-24 | 2006-09-07 | Bernt Rollinger | Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace |
| JP4427370B2 (en) * | 2004-03-26 | 2010-03-03 | Ｊｆｅスチール株式会社 | Method for reforming slag of chromium ore smelting reduction furnace |
| CN101906500A (en) * | 2010-02-05 | 2010-12-08 | 甘肃锦世化工有限责任公司 | Method for directly producing chrome-base alloy steel by comprehensively using calcium-free chrome slag |
| CN102864311A (en) * | 2012-09-21 | 2013-01-09 | 承德建龙特殊钢有限公司 | Recovery method of chromium in high chromium-content slag in steel making-LF (ladle furnace) working procedure |
-
2014
- 2014-07-18 CN CN201410344361.8A patent/CN104087709B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS54158313A (en) * | 1978-06-03 | 1979-12-14 | Nippon Steel Corp | Chromium removing method for chromium-containing slag |
| JP2002235124A (en) * | 2001-02-08 | 2002-08-23 | Nippon Steel Corp | Method for recovering chromium from chromium- containing slag |
| US20060196308A1 (en) * | 2003-05-24 | 2006-09-07 | Bernt Rollinger | Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace |
| JP4427370B2 (en) * | 2004-03-26 | 2010-03-03 | Ｊｆｅスチール株式会社 | Method for reforming slag of chromium ore smelting reduction furnace |
| CN101906500A (en) * | 2010-02-05 | 2010-12-08 | 甘肃锦世化工有限责任公司 | Method for directly producing chrome-base alloy steel by comprehensively using calcium-free chrome slag |
| CN102864311A (en) * | 2012-09-21 | 2013-01-09 | 承德建龙特殊钢有限公司 | Recovery method of chromium in high chromium-content slag in steel making-LF (ladle furnace) working procedure |
Non-Patent Citations (1)
| Title |
|---|
| 王永钢: "含铬滤渣冶炼铬铁的试验研究", 《第19届全国铁合金学术研讨会论文集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048122A (en) * | 2016-08-19 | 2016-10-26 | 东北大学 | Method for reduced treatment of nickel residue through slag bath |
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