CN101191159A - Technique for extracting zinc from blast furnace gas mud by using rotary kiln - Google Patents
Technique for extracting zinc from blast furnace gas mud by using rotary kiln Download PDFInfo
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- CN101191159A CN101191159A CNA2007101932817A CN200710193281A CN101191159A CN 101191159 A CN101191159 A CN 101191159A CN A2007101932817 A CNA2007101932817 A CN A2007101932817A CN 200710193281 A CN200710193281 A CN 200710193281A CN 101191159 A CN101191159 A CN 101191159A
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Abstract
The invention discloses a technique for extracting zinc from blast furnace gas mud by utilization of a rotary kiln, comprising procedures of burdening, pellet fabrication, and reduction of the rotary kiln, wherein, the blast furnace gas mud enters into a balling disc for pellet fabrication after burdening with binding agent; spherical particles obtained are sent into the rotary kiln for heating up by using calorific value generated by combustion of coke oven gas; zinc fume produced by heating up is converted into zinc oxides after sedimentation for a plurality of times; the zinc oxides are collected, and residual solid particles become slag and are collected. The invention not only overcomes the hazard on a blast furnace due to zinc enrichment in the gas mud and improves service life of the blast furnace but also utilizes iron and zinc in the gas mud better.
Description
Technical field
The present invention relates to iron and steel enterprise's utilization of three wastes technical field, relate to the processing and utilizing of the zinc-containing mash gas mud that iron-smelting blast furnace is produced, particularly utilize rotary kiln from blast furnace gas mud, to extract the technology of zinc.
Background technology
To be the fine stove dirt that produces in the blast furnace ironmaking process compile a kind of fine material of formation through processes such as control of dust, washings to gas mud, and a large amount of gas muds causes for ironmaking enterprise to stack and the pressure of recycle.To climb steel our department is example: can produce more than 100,000 ton of gas mud (ton iron can produce about 0.02 ton of gas mud) every year.Blast furnace gas mud iron content carbon content respectively accounts for 1/4-1/3 generally speaking, it is good iron-smelting raw material, if can be recycled, then can save part coal resources and iron ore deposit, simultaneously can reduce expenses such as gas mud transports, stores up in a large number, and avoid throwing aside gas mud and the serious environmental pollution that causes, have important economic implications and environment protection significance.Therefore, many iron and steel enterprises all will return to blast furnace gas mud sintering and enter blast furnace again, reach the purpose that makes full use of the gas mud resource to reclaim iron.But in recent years along with the anxiety of iron ore resource, blast furnace has to use the higher iron ore of part zinc content, caused the enrichment of zinc oxide in blast furnace gas mud like this, contained and return blast furnace behind the gas mud sintering of higher zinc oxide and carry out recycle blast furnace has been caused very big influence.To climb steel iron work is example, blast furnace gas mud send the sintering plant sintering after adopting and directly reclaiming, main raw material as blast furnace behind the sintering comes back in the blast furnace, this technology is not owing to recycle the zinc oxide in the gas mud, and zinc oxide has produced very big harm to blast furnace after entering blast furnace.The one, zinc oxide is reduced under the effect of reducing gas and generates zinc fume and infiltrate furnace lining, makes that furnace lining expands unusually, embrittlement causes shorten blast furnace campaign; The 2nd, the metallurgical performance of zinc fume reduction coke and ore worsens permeability of stock column, produces accretion and hanging, influences smooth operation of furnace.Simultaneously, gas mud adopts directly to reclaim and send sintering plant to send into blast furnace as the batching of agglomerate, makes the gas mud own resource be worth and can not access abundant realization.
Summary of the invention
In order to reduce zinc oxide content in the blast furnace gas mud, reduce its harm in recycle, and this secondary resource is used adequately reasonably blast furnace, the invention provides a kind of technology of from blast furnace gas mud, extracting zinc with rotary kiln.
Technical scheme of the present invention is, described technology comprises that batching, disk make ball, rotary kiln reduction operation, it is characterized in that, go into balling disc after blast furnace gas mud and the wedding agent batching and make ball, the gained spherical particle is sent into the calorific value heat temperature raising that rotary kiln is produced with the coke-oven gas burning, the zinc fume that heat up to produce becomes zinc oxide through sedimentation repeatedly and obtains collecting, and all the other solid particulate matters become slag and obtain collecting.
In the zinc fume settling process, not only contain iron cpd after the mixed polity's particulate matter sedimentation that contains in the zinc fume, and contain the clean zinc that is untreated, therefore it must be turned back to rotary kiln once more carries out pyroprocessing.
In order to guarantee the heat temperature raising requirement, reach the purpose of separation of Zinc, the heat temperature raising of rotary kiln generally should reach 950 ℃-1100 ℃.
In this technology, be thermal source with the coke-oven gas, be reductive agent with the carbon in the gas mud bead, at high temperature wherein zinc oxide and ferriferous oxide are reduced processing, finally obtain zinc oxide product and higher-grade reduced iron (metallization slag).
Employing utilizes coke-oven gas to make thermal source in rotary kiln and gas mud is reduced the advantage of treatment process mainly shows following several respects:
(1) adopt this technology to gas mud handle the zinc oxide that can obtain 70% above grade and 55% above TFe (full iron) and ZnO content less than 1%, degree of metalization is greater than 80% metallization slag, can bring huge economic benefit for enterprise.
(2) adopt this technology that gas mud is handled, owing to do not produce waste gas, waste liquid and waste, environment is not polluted, and make this ironmaking secondary resource obtain fully rationally utilizing, guarantee the utilization of iron work resource circulation, therefore had tangible social enviroment protection benefit.
(3) adopt this technology to carry out the gas mud recycle, not only solved, in the work-ing life of having improved blast furnace, make wherein iron and zinc obtain better utilization simultaneously because of the enrichment of zinc in the gas mud harm to blast furnace.
Description of drawings
To be rotary kiln reduce the process flow sheet of handling to gas mud to Figure of description.
Embodiment
In order fully to understand the physicochemical property of blast furnace gas mud, be sample with the blast furnace gas mud, when be ground to-200 orders with grinding machine after, chemical ingredients detects and sees Table 1, material phase analysis sees Table 2.
Table 1 blast furnace gas mud main chemical compositions (%)
| Element | TFe | Zn | C | Al 2O 3 | SiO 2 | CaO | MgO | TiO 2 | S | P |
| Content | 29.70 | 9.92 | 16.8 | 3.71 | 11.2 | 4.82 | 1.92 | 3.55 | 0.53 | 0.07 |
From the chemical composition analysis of table 1 as can be known: 1. the gas mud iron-holder is not high, and TFe only is 29.70%, directly allocates agglomerate into the iron level of agglomerate will be reduced if adopt.If handle with reduction roasting method, TFe content can be enriched to more than 50%, is the good furnace charge of blast furnace.2.Zn content is higher, is 9.92%, has substantially exceeded external allowing and has allocated standard (＜2%) into.This part Zn is very useful if separate, extract.3. carbon content is very high, is about 15%, and reductive agent is used when can be used as roasting.
The main thing phase of table 2 blast furnace gas mud
| The titanium-containing magnet ore deposit | Martite | Metallic iron | Calcium ferrite | Coke | Zinc oxide | Gangue | |
| Content | About 13% | About 31% | 0.5%-1% | ＜1% | About 16% | About 12% | 25%-30% |
| Monomer particle seldom, mainly is present in the martite, with the martite adhesion. | Being monomer occurs | Generally thick than iron mineral | Granularity is generally less than 0.02mm | Be mainly pyroxene, plagioclase class, quartz of particulate etc. |
From the material phase analysis result of table 2 as can be known, adhesion has part iron aluminosilicate in the martite particle in the gas mud, and edge, titanium-containing magnet ore deposit mainly is the silicate minerals of martite and iron.Small part zinc oxide is connected with rhombohedral iron ore.The relation of inlaying that mineral are such is disadvantageous to the beneficiation enrichment of iron mineral.
At the physicochemical property of gas mud, adopt rotary kiln as reduction furnace, be that thermal source carries out dezincify to gas mud and the direct reducing process of Fu Tie is handled with the coke-oven gas.
As shown in the figure, gas mud is added a certain proportion of wedding agent stir in stirrer, make ball then in multigraph press, granularity is 1～3mm.Bead is sent into rotary kiln with belt, the calorific value that the coke-oven gas burning is produced in the rotary kiln is to the bead heat temperature raising, zinc oxide in the gas mud utilizes coke-oven gas to be thermal source in rotary kiln, the carbon of self is made reductive agent and is reduced into zinc fume for about 1000 ℃ at high temperature, and under the effect of kiln hood gas blower and kiln tail induced draft fan, enter settling pocket, secondary settlement chamber, cloth bag collecting chamber successively, and in process of cooling, be oxidized to zinc oxide by the kiln tail.
Gas mud is reduced into zinc fume from the kiln tail is discharged except that zinc oxide in rotary kiln, wherein the oxide compound of iron also at high temperature also is reduced into metallic iron and forms the metallization slag, and discharges from kiln hood.Because this metallization slag high temperature is come out of the stove, need it to be carried out Water Quenching at kiln hood, at high temperature oxidized to prevent metallic iron, the degree of metalization of assurance slag.
In the zinc fume settling process, not only contain iron cpd after mixing the polity's particulate matter sedimentation that contains in the zinc fume, and containing the clean zinc that is untreated, the zinc oxide grade is lower in settling pocket and the secondary settlement chamber, therefore it must be returned again rotary kiln and reduce processing.
According to this technology blast furnace gas mud is handled, finally obtained the zinc oxide product grade and can sell more than 70%; Metallization slag TFe 〉=55%, ZnO≤1%, degree of metalization 〉=80% can be used as blast furnace, converter, electric furnace raw material and uses.
Claims (4)
1. technology of utilizing rotary kiln from blast furnace gas mud, to extract zinc, described technology comprises that batching, disk make ball, rotary kiln reduction operation, it is characterized in that, go into balling disc after blast furnace gas mud and the wedding agent batching and make ball, the gained spherical particle is sent into the calorific value heat temperature raising that rotary kiln is produced with the coke-oven gas burning, the zinc fume that heat up to produce becomes zinc oxide through sedimentation repeatedly and obtains collecting, and all the other solid particulate matters become slag and obtain collecting.
2. a kind of technology of utilizing rotary kiln to extract zinc from blast furnace gas mud according to claim 1 is characterized in that, the sediment of the zinc fume that rotary kiln comes out after sedimentation repeatedly turns back to rotary kiln once more and carry out pyroprocessing.
3. a kind of technology of utilizing rotary kiln from blast furnace gas mud, to extract zinc according to claim 1 and 2, it is characterized in that, in order to guarantee the heat temperature raising requirement, reach the purpose of separation of Zinc, rotary kiln should reach 950 ℃-1100 ℃ to the heat temperature raising of gas mud bead.
4. a kind of technology of utilizing rotary kiln to extract zinc from blast furnace gas mud according to claim 3 is characterized in that the metallization slag after rotary kiln is to gas mud bead pyroprocessing should carry out Water Quenching.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101932817A CN101191159A (en) | 2007-11-27 | 2007-11-27 | Technique for extracting zinc from blast furnace gas mud by using rotary kiln |
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| CNA2007101932817A CN101191159A (en) | 2007-11-27 | 2007-11-27 | Technique for extracting zinc from blast furnace gas mud by using rotary kiln |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127645A (en) * | 2011-02-18 | 2011-07-20 | 攀枝花钢城集团有限公司 | Technological method for extracting zinc by roasting blast furnace gas mud by virtue of rotary kiln |
| CN102492855A (en) * | 2011-12-28 | 2012-06-13 | 唐锡中 | Method for recovering valuable metal from solid waste material containing zinc |
| CN102766718A (en) * | 2012-07-24 | 2012-11-07 | 新冶高科技集团有限公司 | Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash |
| CN103555966A (en) * | 2013-10-18 | 2014-02-05 | 昆明华吉鑫金属粉料有限公司 | Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material |
| CN104745799A (en) * | 2015-03-19 | 2015-07-01 | 河北钢铁股份有限公司承德分公司 | Method for controlling redox atmosphere of rotary kiln |
| CN105087947A (en) * | 2015-09-16 | 2015-11-25 | 武汉钢铁(集团)公司 | Method for extracting zinc from blast furnace gas mud |
| CN105970001A (en) * | 2016-07-01 | 2016-09-28 | 赫章县金川锌业有限公司 | Method for manufacturing high-grade direct zinc oxide by virtue of rotary kiln |
| CN106152145A (en) * | 2016-06-30 | 2016-11-23 | 湖南博环保科技有限公司 | A kind of method utilizing rotary kiln to dispose the fume afterheat containing zinc hazardous waste |
| CN108085511A (en) * | 2017-11-28 | 2018-05-29 | 酒泉钢铁(集团)有限责任公司 | A kind of method that zinc kiln slag production metallized charge is carried using blast furnace dust |
| CN110564971A (en) * | 2019-10-29 | 2019-12-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering zinc from blast furnace gas mud |
| CN110592387A (en) * | 2019-10-29 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering zinc from high-zinc gas mud |
| CN110743714A (en) * | 2019-10-29 | 2020-02-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for enriching and recovering zinc in blast furnace gas mud |
-
2007
- 2007-11-27 CN CNA2007101932817A patent/CN101191159A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127645A (en) * | 2011-02-18 | 2011-07-20 | 攀枝花钢城集团有限公司 | Technological method for extracting zinc by roasting blast furnace gas mud by virtue of rotary kiln |
| CN102492855A (en) * | 2011-12-28 | 2012-06-13 | 唐锡中 | Method for recovering valuable metal from solid waste material containing zinc |
| CN102766718A (en) * | 2012-07-24 | 2012-11-07 | 新冶高科技集团有限公司 | Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash |
| CN102766718B (en) * | 2012-07-24 | 2013-11-27 | 新冶高科技集团有限公司 | Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash |
| CN103555966A (en) * | 2013-10-18 | 2014-02-05 | 昆明华吉鑫金属粉料有限公司 | Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material |
| CN103555966B (en) * | 2013-10-18 | 2015-07-01 | 昆明华吉鑫金属粉料有限公司 | Method for producing zinc hypoxide powder in rotary kiln by taking blast furnace smoke as raw material |
| CN104745799A (en) * | 2015-03-19 | 2015-07-01 | 河北钢铁股份有限公司承德分公司 | Method for controlling redox atmosphere of rotary kiln |
| CN105087947A (en) * | 2015-09-16 | 2015-11-25 | 武汉钢铁(集团)公司 | Method for extracting zinc from blast furnace gas mud |
| CN106152145B (en) * | 2016-06-30 | 2018-07-03 | 湖南博一环保科技有限公司 | A kind of method of fume afterheat using rotary kiln disposition hazardous waste containing zinc |
| CN106152145A (en) * | 2016-06-30 | 2016-11-23 | 湖南博环保科技有限公司 | A kind of method utilizing rotary kiln to dispose the fume afterheat containing zinc hazardous waste |
| CN105970001A (en) * | 2016-07-01 | 2016-09-28 | 赫章县金川锌业有限公司 | Method for manufacturing high-grade direct zinc oxide by virtue of rotary kiln |
| CN108085511A (en) * | 2017-11-28 | 2018-05-29 | 酒泉钢铁(集团)有限责任公司 | A kind of method that zinc kiln slag production metallized charge is carried using blast furnace dust |
| CN110564971A (en) * | 2019-10-29 | 2019-12-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering zinc from blast furnace gas mud |
| CN110592387A (en) * | 2019-10-29 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering zinc from high-zinc gas mud |
| CN110743714A (en) * | 2019-10-29 | 2020-02-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for enriching and recovering zinc in blast furnace gas mud |
| CN110743714B (en) * | 2019-10-29 | 2022-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for enriching and recovering zinc in blast furnace gas mud |
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