CN101545047B - Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction - Google Patents
Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction Download PDFInfo
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- CN101545047B CN101545047B CN2009101172292A CN200910117229A CN101545047B CN 101545047 B CN101545047 B CN 101545047B CN 2009101172292 A CN2009101172292 A CN 2009101172292A CN 200910117229 A CN200910117229 A CN 200910117229A CN 101545047 B CN101545047 B CN 101545047B
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Abstract
The present invention relates to a method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction, including the steps as follows: a. obtaining a ferro-silicon of a high-temperature molten state by deoxidation and reduction of the nickle smelting waste slag as an iron raw material and other raw material; b. pouring the ferro-silicon into a foundry ladle to insulate to ensure the ferro-silicon to be in the molten state, at the same time infusing chlorine gas into the ferro-silicon to generate solid residue to purify; c. removing the solid residue. For the method of the invention, the nickel smelting waste slag is directly used to replace the iron raw material such as steel shaving, iron scale, sintered ball cluster and the like for the ferro-silicon production, thus it is capable of reducing the dosage of dinas rock or rock quartz; it has been found that the ferro-silicon (FeSi75) produced by the method meets the national standard completely; the invention provides a novel method for producing ferroalloy.
Description
Technical field
The present invention relates to a kind of method of utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon.
Background technology
Nickel smelting waste slag is the smelting waste slag that nickel is smelted discharging in the production, is a kind of industrial solid castoff.Along with the development of producing, solid waste increases year by year, the nickel smelting waste slag of enormous amount is stored up in the open in smelting enterprise periphery slag field, except that minute quantity water supply mud factory makes additive (replacement iron ore), all the other overwhelming majority do not obtain utilizing, and have caused the serious environmental issue to enterprise's periphery ecotope, human settlement.
Measuring and calculating contains a large amount of irony elements and silicon-dioxide in the nickel smelting waste slag by analysis, contains metallic elements such as minor amount of nickel, copper, cobalt, lead, zinc in addition.With the about 1,600,000 tons waste of certain super-huge smelting enterprise is example, and wherein metal, nonmetal theoretical storage are: 620,000 tons of iron content, 4917 tons in nickel, 6273 tons of copper, 1864 tons of cobalts, 337 tons in lead, 5976 tons on zinc, 590,000 tons of silicon-dioxide.This is the huge wasting of resources, shows that also nickel smelting waste slag has huge value of exploiting and utilizing simultaneously, the difficult problem yet the comprehensive utilization of nickel smelting waste slag has at present become international in fact.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon, this method can make full use of depleted nickel smelting waste slag resource, avoid the wasting of resources and the environmental influence that bring thus, produce qualified silicon iron product with lower cost.
For achieving the above object, the technical solution used in the present invention is:
A kind of method of utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon, its special feature is, comprises the steps:
A, nickel smelting waste slag is obtained the ferrosilicon of high temperature fused state as ferriferous raw material with other raw material by the deoxidation and reduction method;
B, pour in the hot metal ladle ferrosilicon into insulation and make ferrosilicon keep molten state, generate solid residue with purification and impurity removal thereby in ferrosilicon, feed chlorine simultaneously;
C, remove solid residue and get final product.
Wherein before step c, also need to shake hot metal ladle 3-5 minute, left standstill then 2-4 minute.
Wherein behind step c, also to remove the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 1-2%.
Wherein behind step b, also to be incubated and make ferrosilicon keep molten state, thereby aerating oxygen generates solid residue with purification and impurity removal in ferrosilicon simultaneously, the consumption of oxygen is a ferrosilicon 0.2-0.5 cubic meter per ton, aeration time is 5-10 minute, or aerating oxygen meets the requirements until foreign matter content in ferrosilicon.
Wherein behind step b, also to be incubated and make ferrosilicon keep molten state, thereby bubbling air generates solid residue with purification and impurity removal in ferrosilicon simultaneously, the consumption of air is a ferrosilicon 1-2.5 cubic meter per ton, and aeration time is 5-10 minute, or bubbling air meets the requirements until foreign matter content in ferrosilicon.
The consumption that wherein feeds chlorine in step b is a ferrosilicon 0.05-0.125 cubic meter per ton, and aeration time is 5-10 minute, or aerating oxygen meets the requirements until foreign matter content in ferrosilicon.
Wherein use graphitized carbon cellulosic material gas duct to stretch in this hot metal ladle among the step b with ventilation.
Wherein the ferrosilicon of molten state is meant that the ferrosilicon temperature is at 1250-1700 ℃.
Wherein other raw material is meant silica and reductive agent among the step e, or quartz and reductive agent.
Wherein reductive agent adopts blue carbon, metallurgical coke or bottle coal Jiao.
The inventive method is directly used in ferriferous raw materials such as alternative steel cuttings, iron scale, agglomerates of sintered pellets in the ferrosilicon production with nickel smelting waste slag, reduce silica (or quartzy) consumption simultaneously, experiment showed, that the ferrosilicon (FeSi75) that adopts the inventive method to produce meets national standard fully.In addition, the ferrosilicon that adopts the present invention to produce still is a kind of microalloy ferro-silicon, contains micro-nickel, copper, cobalt element, can improve the steel-making quality to a certain extent with microalloy ferro-silicon steel-making.Microalloy ferro-silicon is used for stainless steel, when special steel is produced, can saves the consumption of nickel, cobalt, thereby reduces steel-making cost.
Adopt method of the present invention efficiently comprehensively to reclaim elements such as the iron in the nickel smelting waste slag, silicon, nickel, cobalt, copper.Wherein the silicon rate of recovery is more than 95%, and iron recovery is more than 96%, and nickel recovery is more than 92%, and the cobalt rate of recovery is more than 93%, and copper recovery is more than 90%.Reached the purpose of large industrial solid castoff recycling, existing smelting enterprise deposits nickel smelting waste slag and has taken a large amount of soils, adopt the inventive method not only to contain nickel smelting waste slag constantly engulfing to the soil, can also progressively discharge the soil that occupied originally by handling original nickel smelting waste slag, this not only produces economic benefit, also produces corresponding environmental benefit and social benefit.
Embodiment
The principle that the inventive method is produced ferrosilicon is:
Nickel smelting waste slag, silica, coke and the blue carbon (or other reductive agent) of release mesh are prepared burden in proportion at the batching station, compound is delivered to throat platform, by the shuttle-type belt compound is unloaded to furnace top bin again through charging belt.Furnace charge is interrupted through the material pipe and adds in the electric arc furnace, and under the high arc temperature state, ferro element in the nickel smelting waste slag and element silicon are reduced by carbon simultaneously, and the element silicon in the silicon-dioxide is also determined the ferrosilicon that mixes by carbon reduction generation ratio.
Reaction equation is
C+O
2=CO
2↑+heat (under the conditions at the arc)
C+CO
2=2CO ↑-heat (under the conditions at the arc)
FeSiO
32FeOSiO
2+ 7CO=3Fe+2Si+7CO
2↑-heat (under the conditions at the arc)
SiO
2+ 2CO=Si+2CO
2↑-heat (under the conditions at the arc)
The inventive method to the principle of the ferrosilicon purification and impurity removal that contains impurity is:
Utilize furnace outer refining technology, high pressure chlorine, high pressure oxygen successively are blown into respectively in the ferrosilicon that contains impurity of molten state, quantitatively it is carried out purification and impurity removal handles in batches, detrimental impurity (as aluminum oxide, magnesium oxide, calcium oxide, sulfide etc.) in the waste is fully reacted, promote to generate the less new compound of proportion by even, slight level concussion simultaneously, new compound floats on above the ferrosilicon and separates out, and heavy metal deposition is in lower floor.The detrimental impurity that will contain with this technology in the ferrosilicon of impurity is reduced in the specialized range, makes the ferrosilicon that contains impurity obtain purifying.
Reaction equation is
2Ca+O
2=2CaO (under the high temperature fused state)
2Mg+O
2=2MgO (under the high temperature fused state)
4Al+3O
2=2Al
2O
3(under the high temperature fused state)
2K+Cl
2=2KCl (under the high temperature fused state)
2Na+Cl
2=2NaCl (under the high temperature fused state)
The inventive method mainly is the steel cuttings during nickel smelting waste slag is directly produced as the existing ferrosilicon smelting of ferriferous raw material replacement, iron scale, ferriferous raw materials such as agglomerates of sintered pellets, certainly also substituted simultaneously the part silica raw material, because the content of silicon and iron is determined in the nickel smelting waste slag, therefore can calculate the consumption of other raw material easily, with silicon, the proportion relation and the prior art of iron calculating stock yard are identical, and in addition have other raw material (as reductive agent) of deoxidation and reduction smelting duriron now, all proportion of raw materials, all identical with processing parameter etc. with prior art.
Owing to contain impurity in the nickel smelting waste slag, therefore it is directly also contained certain impurity as the ferrosilicon of raw material production, the inventive method is utilized furnace outer refining technology, high pressure chlorine, high pressure oxygen successively are blown into respectively in the ferrosilicon that contains impurity of molten state, quantitatively it is carried out purification and impurity removal in batches and handle, thereby obtain qualified silicon iron product.
Below for producing low nickel matte, hot waste is the chemical component table of the electric furnace warm sludge composition representative value of ferronickel slag:
Electric furnace warm sludge composition (%) in three months
Embodiment 1:
A, nickel smelting waste slag is obtained temperature ferrosilicon (impure) 1250 ℃ molten states with silica and blue carbon by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, in ferrosilicon, at the uniform velocity feed chlorine (high pressure chlorine) thus generate solid residue with purification and impurity removal, the consumption of chlorine is 0.05 cubic metre of a ferrosilicon per ton, and aeration time is 5 minutes;
C, even, slight level were shaken hot metal ladle 3 minutes, left standstill then 2 minutes;
D, remove solid residue and get final product;
E, remove the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 1% and get final product.
Embodiment 2:
A, nickel smelting waste slag is obtained temperature ferrosilicon 1700 ℃ molten states with silica and metallurgical coke by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, thereby in ferrosilicon, at the uniform velocity feed chlorine and generate solid residue with purification and impurity removal, the consumption of chlorine is 0.125 cubic metre of a ferrosilicon per ton, and aeration time is 10 minutes;
C, even, slight level were shaken hot metal ladle 5 minutes, left standstill then 4 minutes;
D, remove solid residue and get final product;
E, remove the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 2% and get final product.
Embodiment 3:
A, nickel smelting waste slag is obtained temperature ferrosilicon 1300 ℃ molten states with the gentle coal tar of quartz by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, thereby in ferrosilicon, at the uniform velocity feed chlorine and generate solid residue with purification and impurity removal, the consumption of chlorine is 0.1 cubic metre of a ferrosilicon per ton, aeration time is 7 minutes, or feeding chlorine meets the requirements until foreign matter content in ferrosilicon;
C, even, slight level were shaken hot metal ladle 4 minutes, left standstill then 3 minutes;
D, remove solid residue and get final product;
E, remove the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 1.5% and get final product.
Embodiment 4:
A, nickel smelting waste slag is obtained temperature ferrosilicon (impure) 1250 ℃ molten states with quartzy and blue carbon by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, in ferrosilicon, at the uniform velocity feed chlorine (high pressure chlorine) thus generate solid residue with purification and impurity removal, the consumption of chlorine is 0.05 cubic metre of a ferrosilicon per ton, and aeration time is 5 minutes;
C, insulation make ferrosilicon keep molten state, simultaneously in ferrosilicon aerating oxygen (high pressure oxygen) thus generate solid residue with purification and impurity removal, the consumption of oxygen is 0.3 cubic metre of a ferrosilicon per ton, aeration time is 6 minutes;
D, even, slight level were shaken hot metal ladle 3 minutes, left standstill then 2 minutes;
E, remove solid residue and get final product;
F, remove the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 1% and get final product.
Embodiment 5:
A, nickel smelting waste slag is obtained temperature ferrosilicon 1700 ℃ molten states with silica and metallurgical coke by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, thereby in ferrosilicon, at the uniform velocity feed chlorine and generate solid residue with purification and impurity removal, the consumption of chlorine is 0.125 cubic metre of a ferrosilicon per ton, and aeration time is 10 minutes;
C, insulation make ferrosilicon keep molten state, simultaneously in ferrosilicon bubbling air (high-pressure air) thus generate solid residue with purification and impurity removal, the consumption of air is 2 cubic metres of ferrosilicon per ton, aeration time is 8 minutes;
D, even, slight level were shaken hot metal ladle 5 minutes, left standstill then 4 minutes;
E, remove solid residue and get final product;
F, remove the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 2% and get final product.
Embodiment 6:
A, nickel smelting waste slag is obtained temperature ferrosilicon 1300 ℃ molten states with quartzy, metallurgical coke and blue carbon by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, thereby in ferrosilicon, at the uniform velocity feed chlorine generation solid residue, meet the requirements until foreign matter content with purification and impurity removal;
C, insulation make ferrosilicon keep molten state, thereby while aerating oxygen in ferrosilicon generates solid residue with purification and impurity removal, meets the requirements until foreign matter content;
C, even, slight level were shaken hot metal ladle 4 minutes, left standstill then 3 minutes;
D, remove solid residue and get final product.
Embodiment 7:
A, nickel smelting waste slag is obtained temperature ferrosilicon 1300 ℃ molten states with the gentle coal tar of quartz by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, thereby in ferrosilicon, at the uniform velocity feed chlorine and generate solid residue with purification and impurity removal, the consumption of chlorine is 0.1 cubic metre of a ferrosilicon per ton, aeration time is 7 minutes, or feeding chlorine meets the requirements until foreign matter content in ferrosilicon;
C, remove solid residue and get final product.
Embodiment 8:
A, nickel smelting waste slag is obtained temperature ferrosilicon 1500 ℃ molten states with silica and metallurgical coke by the deoxidation and reduction method as ferriferous raw material;
B, pour in the hot metal ladle ferrosilicon into insulation and keep molten state, stretch into this hot metal ladle bottom with graphitized carbon cellulosic material gas duct simultaneously, thereby at the uniform velocity feed chlorine and generate solid residue with purification and impurity removal in ferrosilicon, the consumption of chlorine is 0.12 cubic metre of a ferrosilicon per ton, and aeration time is 8 minutes;
C, insulation make ferrosilicon keep molten state, simultaneously in ferrosilicon bubbling air (high-pressure air) thus generate solid residue with purification and impurity removal, the consumption of air is 1.5 cubic metres of ferrosilicon per ton, aeration time is 6 minutes;
D, even, slight level were shaken hot metal ladle 3 minutes, left standstill then 3 minutes;
E, remove solid residue and get final product;
By the ferrosilicon that adopts the foregoing description technical scheme to smelt is analyzed, (be mainly nickel at the heavy metal layer of not removing the ferrosilicon lower floor of containing impurity, copper, cobalt etc.) under the situation, the product that the present invention smelts is a microalloy ferro-silicon, country does not still have the microalloy ferro-silicon product standard at present, the microalloy ferro-silicon product is as the substitute products of common ferrosilicon, bring certain benefit to turn the nickel of usefulness into except that containing trace to steel products, outside the cobalt element, all the other indexs are all identical with common 75% ferrosilicon, so the silicon iron product technical qualification of inventive method preparation meet the GB2272-87 specified standards.
Accordingly, under the situation of the heavy metal layer of removing ferrosilicon lower floor, the product index that the present invention smelts is all identical with common 75% ferrosilicon, meets the GB2272-87 specified standards.
Claims (6)
1. a method of utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon is characterized in that, comprises the steps:
A, nickel smelting waste slag is obtained the ferrosilicon of high temperature fused state as ferriferous raw material with other raw material by the deoxidation and reduction method; Other raw material is meant silica and reductive agent, or quartz and reductive agent, and reductive agent adopts metallurgical coke;
B, pour in the hot metal ladle ferrosilicon into insulation and make ferrosilicon keep molten state, generate solid residue with purification and impurity removal thereby in ferrosilicon, feed chlorine simultaneously;
C, concussion hot metal ladle 3-5 minute left standstill 2-4 minute then, removed solid residue, removed the heavy metal layer that molten state ferrosilicon lower floor accounts for ferrosilicon gross weight 1-2% then.
2. the method for utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon as claimed in claim 1, it is characterized in that: wherein behind step b, also will be incubated and make ferrosilicon maintenance molten state, thereby aerating oxygen generates solid residue with purification and impurity removal in ferrosilicon simultaneously, the consumption of oxygen is a ferrosilicon 0.2-0.5 cubic meter per ton, and aeration time is 5-10 minute.
3. the method for utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon as claimed in claim 1, it is characterized in that: wherein behind step b, also will be incubated and make ferrosilicon maintenance molten state, thereby bubbling air generates solid residue with purification and impurity removal in ferrosilicon simultaneously, the consumption of air is a ferrosilicon 1-2.5 cubic meter per ton, and aeration time is 5-10 minute.
4. the method for utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon as claimed in claim 1 is characterized in that: the consumption that wherein feeds chlorine in step b is a ferrosilicon 0.05-0.125 cubic meter per ton, and aeration time is 5-10 minute.
5. as any described method of utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon in the claim 1 to 4, it is characterized in that: wherein use graphitized carbon cellulosic material gas duct to stretch in this hot metal ladle among the step b with ventilation.
6. as any described method of utilizing nickle smelting waste slag electric stove integral deoxidation and reduction to produce microalloy ferro-silicon in the claim 1 to 4, it is characterized in that: wherein the ferrosilicon of molten state is meant that the ferrosilicon temperature is at 1250-1700 ℃.
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| CN2009101172292A CN101545047B (en) | 2009-02-12 | 2009-02-12 | Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction |
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|---|---|---|---|
| CN2009101172292A CN101545047B (en) | 2009-02-12 | 2009-02-12 | Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1157858A (en) * | 1996-10-17 | 1997-08-27 | 张铁铮 | Method for producing ultra low-carbon duriron |
| CN1380433A (en) * | 2002-01-28 | 2002-11-20 | 武汉钢铁(集团)公司 | Method for producing hihg-purity silicon iron |
| CN1880496A (en) * | 2005-06-13 | 2006-12-20 | 黄发杨 | Process for producing ultrafine aluminium low-carbon ferrosilicon |
| CN101195863A (en) * | 2007-12-20 | 2008-06-11 | 金川集团有限公司 | Method for producing iron alloy with smelted furnace cinder |
| CN101545040A (en) * | 2009-02-09 | 2009-09-30 | 牛庆君 | Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1157858A (en) * | 1996-10-17 | 1997-08-27 | 张铁铮 | Method for producing ultra low-carbon duriron |
| CN1380433A (en) * | 2002-01-28 | 2002-11-20 | 武汉钢铁(集团)公司 | Method for producing hihg-purity silicon iron |
| CN1880496A (en) * | 2005-06-13 | 2006-12-20 | 黄发杨 | Process for producing ultrafine aluminium low-carbon ferrosilicon |
| CN101195863A (en) * | 2007-12-20 | 2008-06-11 | 金川集团有限公司 | Method for producing iron alloy with smelted furnace cinder |
| CN101545040A (en) * | 2009-02-09 | 2009-09-30 | 牛庆君 | Method for producing microalloy ferro-silicon by using a nickle smelting waste slag electric stove integral deoxidation and reduction |
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