CN101265508A - Harmless resource treatment method for chromium slag by using blast furnace iron-making technique - Google Patents
Harmless resource treatment method for chromium slag by using blast furnace iron-making technique Download PDFInfo
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- CN101265508A CN101265508A CNA2007100569402A CN200710056940A CN101265508A CN 101265508 A CN101265508 A CN 101265508A CN A2007100569402 A CNA2007100569402 A CN A2007100569402A CN 200710056940 A CN200710056940 A CN 200710056940A CN 101265508 A CN101265508 A CN 101265508A
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- slag
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Abstract
The invention relates to a conventional blast furnace ironmaking technology, which is a method that metal chromium reacts with iron in sintering ore to form chromium iron; the metal chromium is generated by reduction reaction of hexavalent chrome and trivalent chromium; the hexavalent chrome remains in detoxification chromium residue sintering charge block; the trivalent chromium remains in the chromium residue sintering charge block; the detoxification chromium residue sintering charge block is generated by the burning of fuel coke and coke, both of which provide reducer and heat in the blast furnace ironmaking. The sintering iron-smelting technology (art) of the method is a metallurgical industrial production with a large material flow. The method also requires that the chromium residue has a larger amount of and relatively stable ingredient compositions. The technology adapts to all supply conditions with iron ore concentrate, rich ore powders, etc. The method has the advantages of complete detoxification, lower cost, little pollution, remarkable economic benefit, social benefit and environmental benefit. The technology is the method which changes the waste residue with chromium into resource. The chromium residue sintering charge makes up the charge (high basicity sinter) with the coke pro rata. The admixture is transported into the blast furnace to be smelted by a charging mechanism to generate the chromium iron underthe blast furnace technology condition. Furnace cinder generated by blast furnace smelting forms water quench cinder used for cement admixture after water quench. The generated coal gas dust is used for the sintering ore.
Description
Technical field
The invention relates to reductive agent and heat that conventional blast furnace technology is a blast furnace ironmaking---residual sexavalent chrome and make in the chromium slag material block sintering trivalent chromium reduction become that iron formation contains the chromium pig iron method in chromium metal and the agglomerate in the detoxification chromium slag material block sintering that the burning of fuel coke and coke produces.
Background technology
Present millions of tons of China's volume of cargo in storage, annual also have hundreds of thousands of ton chromium slag to produce, and seeks to utilize in the recycling economy chromium slag for just harmful chromic slag harmlessness resource utilization of raw material and speed is fast, expense is low method, is when previous important topic.Utilize the existing conventional blast furnace iron-making process condition of China to be improved, sexavalent chrome and chromium make its reduction and become that the chromium element is a task of the present invention in the Chrome metal powder pig iron through the blast furnace pyrotic smelting in the chromium slag.
Summary of the invention
The objective of the invention is to place blast furnace ironmaking from the dissolubility agglomerate, make a kind of method of residual sexavalent chrome compound and trivalent chromium resource utilization in the agglomerate what the chromium slag sintered into.
It is that the ferro element in the ore is restored that the present invention gives blast furnace ironmaking, and the liquefy pig iron flows out the iron in the agglomerate that the outer technological process of stove makes the chromium slag.And chromium element reduction wherein will be come out, become the chrome-bearing alloy pig iron, to realize thorough sexavalent chrome detoxifcation and resource utilization.
Blast furnace ironmaking process is reduced to trivalent chromium and residual sexavalent chrome.Its reduction mechanism is to utilize the reductive agent of blast furnace ironmaking and heat all by fuel---coke and coke burning produce.During production, furnace charge (self-fluxed sinter, coke etc.) is packed into from furnace roof, and blasting hot blast from the air port, bottom, fierce combustion reactions takes place down in that the tuyere zone hot blast is combustion-supporting in the carbon element in the coke (also having the small amount of carbon hydrogen compound), produces to have the very reducing gas of high-temperature (CO and small amount of H in a large number
2).High temperature gas flow in uphill process with the furnace charge heating that descends, and with the ore deposit in some oxide compound generation reduction reactions.CO in the air-flow, H
2Captured oxygen wherein with the red-hot solid carbon of part in the furnace charge, iron etc. is restored, fusing then, carburizing form the pig iron and accumulate in the cupola well bottom, regularly discharge from cinder notch.And last reductive component in the ore deposit is mainly CaO, MgO, SiO
2, Al
2O
3Deng, form slag, on the floating long-pending firmly liquid pig iron face, regularly discharge from cinder notch.
Blast-furnace smelting will be with the reductive agent of CO, and gas-phase product is CO
2Reduction reaction be referred to as between for indirect reduction, and will make reductive agent with solid carbon, gas-phase product is to be directly reduction between the reduction reaction of CO is referred to as.
Different with the reduction of ferriferous oxide, in blast furnace, Cr
3+Reduction can only be by directly reduction realization, its reaction is as follows:
(Cr
2O
3)+3C＝[Cr]+3CO (1)
ΔG
0 T＝187650-124.95T
(Cr
2O
3)+13/3C＝2/3[Cr
3C
2]+2CO (2)
ΔG
0 T＝730940-511.68T
2/3(Cr
2O
3)+18/7C＝4/21[Cr
3C
2]+2CO?(3)
ΔG
0 T＝511128-364.57T
(Cr
2O
3)+81/23C＝2/23[Cr
23C
6]+3CO (4)
ΔG
0 T＝749452-526.47T
When iron exists:
(Cr
2O
3)+2[Fe]+3C＝2[CrFe]+3CO (5)
Above-mentioned Cr
3+The position that reduction reaction takes place is mainly at following molten slag of blast furnace slagging band and solid carbon phase interface, and on cupola well liquid metal and the slag phase interface.
Remaining Cr in the agglomerate
6+Though the activity of (＜5mg/kg) is very low, pyrolysis can take place still under furnace high-temperature and strong reducing environment and by reduction such as C, reduction reaction is as follows:
4/3CrO
3+2C＝2/3Cr
2O
3+2CO (6)
ΔG
0 T＝266527-342T
4/3CrO
3+2Fe＝2/3Cr
2O
3+2FeO (7)
ΔG
0 T＝551622-49.4T
Reaction product Cr
2O
3Further be reduced to element Cr immediately and be attached in the pig iron Cr
6+To this thorough elimination.This method sintered ironmaking technology (technology) is the metallurgical industry production of a big material flow, and it requires the chromium slag to have bigger quantity to become to be grouped into metastable.This technology is applicable to that all possess supply conditions such as iron ore concentrate or rich ore powder.This method thorough expense of detoxifying is lower, pollution-free, and economic benefit, social benefit, environmental benefit are obvious, are the methods of chromium residue resource utilization.
Described chromium slag sintered material and coke burden carry out (high basicity sinter) batching in proportion, go into blast-furnace smelting through feeder and produce the chrome-bearing alloy pig iron under the blast furnace technology condition, and blast-furnace smelting produces slag and form the shrend slag as cement mixture material after shrend.The coal gas ash that produces is used for agglomerate.
Description of drawings
Accompanying drawing is for realizing the method figure of chromic slag harmlessness resource utilization with the blast furnace iron-making process technology
1, coke; 2, self-fluxed sinter; 3, batching; 4, form high basicity sinter; 5, enter feeder; 6, go into blast furnace; 7, carry out the pyrotic smelting output Chrome metal powder pig iron; 8, produce slag in the smelting process; 9, shrend; 10, form Water Quenching Slag; 11, can make cement; 12, coal gas in the blast-furnace smelting; 13, fly-ash separator; 14, collect coal gas dirt; 15, be used for agglomerate.
Claims (4)
1. chromium slag sintered material ore deposit and coke burden, the chromium slag sintered material that makes that generates the chrome-bearing alloy pig iron through blast-furnace smelting thoroughly detoxifies, and makes chromium element resource technology in the chromium slag, and detoxifcation thoroughly, do not produce secondary pollution, its output Water Quenching Slag and coal gas ash are made cement mixture and sintered material.
2. claim " 1 " chromium slag burns till material and makes blast furnace pyrotic smelting material with the coke proportioning, makes sexavalent chrome and trivalent chromium be reduced to chromium metal.
3. claim " 1 " and " 2 " are through the blast furnace smelting process condition, make that the chromium element reduction generates the chrome-bearing alloy pig iron in iron in the chromium slag sintered material.
4. claim " 1～3 " the chromium slag sintered material Water Quenching Slag and the coal gas ash of going into behind the blast furnace output product made cement mixture and sintered material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100569402A CN101265508A (en) | 2007-03-16 | 2007-03-16 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100569402A CN101265508A (en) | 2007-03-16 | 2007-03-16 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101265508A true CN101265508A (en) | 2008-09-17 |
Family
ID=39988198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100569402A Pending CN101265508A (en) | 2007-03-16 | 2007-03-16 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705317B (en) * | 2009-09-14 | 2011-06-29 | 重庆瑞帆再生资源开发有限公司 | Harmless process method for chrome slag by utilizing metallurgy sintering and blast furnace |
| 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 |
| CN103121802A (en) * | 2011-11-18 | 2013-05-29 | 中国科学院过程工程研究所 | Method for preparing magnesium-oxy-chloride cement by utilizing chromium slag produced through salt sub-melting technology |
| CN103361484A (en) * | 2012-03-26 | 2013-10-23 | 云南曲靖越钢集团有限公司 | Harmless treatment method of chromium slag generated by preparation of chromium salt employing little calcium roasting method, and application of method |
| CN104017927A (en) * | 2014-06-03 | 2014-09-03 | 中信锦州金属股份有限公司 | Method of smelting chromium-containing pig iron by utilization of chromium slag |
| CN105734297A (en) * | 2016-04-22 | 2016-07-06 | 四川大学 | Method for reduction and detoxification of stainless steel acid pickling sludge |
| CN105921483A (en) * | 2016-04-29 | 2016-09-07 | 义马环保电力有限公司 | Environment-friendly treatment system and method for fly ash of household garbage power generating station |
| CN106500106A (en) * | 2016-09-19 | 2017-03-15 | 中信锦州金属股份有限公司 | A kind of method detoxified to leached-out chromium residue by utilization sintering technology |
| CN111252882A (en) * | 2020-02-29 | 2020-06-09 | 广州绿邦环境技术有限公司 | Chromium slag resource utilization equipment and treatment process thereof |
-
2007
- 2007-03-16 CN CNA2007100569402A patent/CN101265508A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705317B (en) * | 2009-09-14 | 2011-06-29 | 重庆瑞帆再生资源开发有限公司 | Harmless process method for chrome slag by utilizing metallurgy sintering and blast furnace |
| CN103121802B (en) * | 2011-11-18 | 2014-11-05 | 中国科学院过程工程研究所 | Method for preparing magnesium-oxy-chloride cement by utilizing chromium slag produced through salt sub-melting technology |
| CN103121802A (en) * | 2011-11-18 | 2013-05-29 | 中国科学院过程工程研究所 | Method for preparing magnesium-oxy-chloride cement by utilizing chromium slag produced through salt sub-melting technology |
| CN103361484A (en) * | 2012-03-26 | 2013-10-23 | 云南曲靖越钢集团有限公司 | Harmless treatment method of chromium slag generated by preparation of chromium salt employing little calcium roasting method, and application of method |
| CN102864311B (en) * | 2012-09-21 | 2014-11-26 | 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 |
| 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 |
| CN104017927A (en) * | 2014-06-03 | 2014-09-03 | 中信锦州金属股份有限公司 | Method of smelting chromium-containing pig iron by utilization of chromium slag |
| CN104017927B (en) * | 2014-06-03 | 2015-11-25 | 中信锦州金属股份有限公司 | A kind of chromium slag melting that utilizes is containing the method for chromium pig iron |
| CN105734297A (en) * | 2016-04-22 | 2016-07-06 | 四川大学 | Method for reduction and detoxification of stainless steel acid pickling sludge |
| CN105921483A (en) * | 2016-04-29 | 2016-09-07 | 义马环保电力有限公司 | Environment-friendly treatment system and method for fly ash of household garbage power generating station |
| CN105921483B (en) * | 2016-04-29 | 2018-04-03 | 义马环保电力有限公司 | The environment-friendly disposal system and method for house refuse power station flying dust |
| CN106500106A (en) * | 2016-09-19 | 2017-03-15 | 中信锦州金属股份有限公司 | A kind of method detoxified to leached-out chromium residue by utilization sintering technology |
| CN106500106B (en) * | 2016-09-19 | 2019-06-07 | 中信锦州金属股份有限公司 | A method of detoxified using sintering technology leached-out chromium residue |
| CN111252882A (en) * | 2020-02-29 | 2020-06-09 | 广州绿邦环境技术有限公司 | Chromium slag resource utilization equipment and treatment process thereof |
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Open date: 20080917 |