CN1699606A - Method for treating blast furnace dust - Google Patents
Method for treating blast furnace dust Download PDFInfo
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- CN1699606A CN1699606A CNA2005102002110A CN200510200211A CN1699606A CN 1699606 A CN1699606 A CN 1699606A CN A2005102002110 A CNA2005102002110 A CN A2005102002110A CN 200510200211 A CN200510200211 A CN 200510200211A CN 1699606 A CN1699606 A CN 1699606A
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- iron powder
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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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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The present invention discloses an ash removal method for blast furnaces. It belongs to metallurgical technology field. Its main characteristic is mixing blast furnaces ashes with water to make slurry. The slurry is separated to obtain coke powder of high grade through the first and second floatation separation. The slurry containing more iron from first and second floatation machine is pumped into the first and second spiral chute. After gravity selection, magnetic selection, the high grade iron powder is obtained. The waste water passes through pressure filtration to recycle fine iron powder. The filtrated water is reused to make slurry for blast furnaces ash removal. The present invention is used to treat dedusting ashes from blast furnaces. As compared with the existing technologies, the invention can considerably increase the yield of iron powder selection and the grade of the iron powder and coke powder, and also avoid making new environment pollution.
Description
Technical field
The present invention relates to metallurgical technology field, especially a kind of processing method of handling the exhaust gas dust that contains certain iron powder and coke powder that iron-making production produces.
Technical background
Iron-smelting blast furnace contains a lot of dust in the waste gas that production process produced, these dust are generally all collected by dry process such as gravitational dust collection, bag-type dusts when outwards discharging, and adopts wet processing to collect sometimes.This dust is commonly referred to blast furnace dedusting ash or dry method ash, gas ash etc. (following general designation blast furnace dedusting ash is called gas mud when adopting wet processing to collect).Contain still available iron powder and coke powder in the blast furnace dedusting ash, because the content of these two kinds of different substancess is all less, with smelting iron and steel the technical requirements of raw material is differed bigger, can not be as the iron powder batching, can not allocate into as coke powder, therefore most of steel mill does not all utilize well, has only outside discharging.This treatment process to blast furnace dedusting ash not only takies a large amount of soils, also environment has been produced serious pollution simultaneously.Current, China Steel output has reached 200,000,000 tons, and the blast furnace dedusting ash annual emissions is estimated more than 2,000,000 tons.Therefore, how to make blast furnace dedusting ash resource utilization, minimizing, the comprehensive development and utilization blast furnace dedusting ash to improving the state of the art of metallurgical slag comprehensive utilization, realizes that the sustainable development of Iron And Steel Industry has the meaning of particularly important effectively.
It is reported that domestic only have indivedual steel mills that blast furnace dedusting ash has been carried out extracting the comprehensive development and utilization of coke powder and iron powder, adopted flotation and the screw selecting process combined in the technique of preparing.Specifically, earlier blast furnace dedusting ash is added the water pulping exactly, behind the dropping flotation reagent, slip is injected one-level flotation machine and secondary flotation machine, sub-elect the coke powder, the iron content slurry that comes out from flotation machine enters the spiral concentration basin again, selects behind the iron powder the discarded discharging of remaining slurry.This technology is lower to the elimination factor of iron powder, and selected iron powder, the grade of coke powder is low and the fluctuation is big, and the iron level in the iron powder of generally selecting is about 55%, and contained fixed carbon is about 72% in the coke powder.In addition, this technology is to the flotation reagent large usage quantity, and technology cost height contains in institute's waste discharge that suspended substance is more, quantity discharged is bigger, and environment has been produced new bigger pollution.
Summary of the invention
The treatment process that the purpose of this invention is to provide a kind of blast furnace dedusting ash, it can improve the iron powder gaining rate significantly, improves the grade of gained iron powder, coke powder, can also avoid producing simultaneously new pollution.
To achieve these goals, the treatment process of blast furnace dedusting ash of the present invention is that it includes following processing step:
A, blast furnace dedusting ash is added the water pulping, allow this slurry in first step flotation machine, mix and carry out flotation, the pulp separation that carbon containing is more is come out with flotation agent;
B, the slurry that isolated carbon containing in the first step flotation machine is more carry out flotation again in the flotation machine of the second stage, continue to isolate the coke powder than higher-grade;
C, the tail slurry in the first step, the second stage flotation machine inserted in the first step spiral concentration basin carry out gravitational segregation, iron powder is separated;
D, the tail slurry in the first step spiral concentration basin is inserted in the spiral concentration basin of the second stage, carry out gravitational segregation again, isolate the higher iron powder of iron content;
E, the tail slurry of second stage spiral concentration basin is passed through magnetic separation again, further sub-elect iron powder;
F, the moisture content of above-mentioned each gained isolate is inserted settling tank precipitation, the waste water that settling tank is overflowed is inserted pressure filter and is carried out press filtration, obtains thin iron powder wherein, and the water that leaches is added the pulping that is used in the A step initiate blast furnace dedusting ash.
Owing to adopt technical scheme of the present invention, compared with prior art, have following beneficial effect:
1, select at the screw selecting of prior art and increased second stage screw selecting and magnetic separation in the processing step, it has improved grade and the iron powder elimination factor of selecting iron powder effectively.
2, the waste water in will producing is through press filtration, effectively utilize waste water, avoid causing new pollution to effluxing, simultaneously, this is a technical knowhow to reducing the flotation reagent consumption and improving the coke grade powder, behind the employing filter-pressing process, has removed the suspended substance in the water, not only reduce the flotation reagent consumption, also improved the grade of coke powder.
3, in whole technological process, because its tailings iron content reduces greatly, but also contain a spot of coke powder of not selecting, therefore can be used for building materials industry as baking bricks materials etc., not only make full use of the energy but also can not cause again second environmental pollution.
4, selected iron powder of the present invention and coke powder are because its grade is higher, and its iron powder can directly be supplied sintering plant as batching; Its coke powder can directly be supplied iron work as the coal powder injection materials, can further reduce the cost of ironmaking.
Description of drawings
Fig. 1 is the process flow diagram in the embodiment of the invention, and dotted line is represented the water stream channel that impurity is very little.
Embodiment
The invention will be further described below in conjunction with the example of Fig. 1:
Embodiment: certain Iron And Steel Company produces 30000 tons of blast furnace dedusting ash, its main chemical compositions such as following table per year.
The blast furnace dedusting ash main chemical compositions
| Full iron (%) | Metallic iron (%) | Fixed carbon (%) | SiO 2(％) | CaO(％) | P(％) | S(％) |
| 22-39 | 20-32 | 17-30 | 0.1-1.5 | 0.1-0.6 | 0.005-0.05 | 0.035-0.120 |
The treatment process of this blast furnace dedusting ash is:
A, blast furnace dedusting ash is added the water pulping, allow this slurry in first step flotation machine, mix and carry out flotation, the more slurry of carbon containing with contain the more pulp separation of iron powder with flotation agent;
B, slurry that isolated carbon containing in the first step flotation machine is more be further flotation in the flotation machine of the second stage, continues to isolate the coke powder, further improves the coke grade powder;
C, the isolated more slurry of iron powder that contains in the first step, the second stage flotation machine is pumped in the first step spiral concentration basin and carries out gravitational segregation, iron powder is separated with impurity (tail slurry);
D, the isolated less tail slurry of iron powder that contains in the first step spiral concentration basin is injected second stage spiral concentration basin, continue to isolate the higher iron powder of iron content;
E, the tail slurry of second stage spiral concentration basin is passed through magnetic separation again, further sub-elect iron powder;
F, coke powder, the iron powder that sub-elects entered settling tank precipitation respectively, the waste water that overflows enters pressure filter and carries out press filtration, and the water that leaches is added the pulping that is used in the A step initiate blast furnace dedusting ash;
G, to the tiny iron powder that pressure filter comes out, look its grade, satisfactory just directly as product; Undesirablely entering the A operation or do not seeing branch tail mud.
Above-mentioned blast furnace dedusting ash after treatment, it handles gained result's index of correlation data such as following table.
| Name of material | Full iron (%) | Metallic iron (%) | Fixed carbon %) | Elimination factor (%) |
| The blast furnace dedusting ash raw material | 30.6 | 29.2 | 24.5 | |
| The iron powder that sub-elects | 72.8 | 69.1 | 3.2 | 70.0 |
| The coke powder that sub-elects | 5.4 | 4.0 | 84.6 | 78.0 |
| Tailings | 10.2 | 8.2 | 12.4 |
In the present embodiment, per 100 tons of blast furnace dedusting ash can extract iron powder about the 20-40 ton and the coke powder about the 20-30 ton, and the grade of iron powder is basicly stable about 72%, and the coke powder grade is stabilized in about 84%.Iron powder that is extracted and coke powder have met the requirement of smelting iron and steel substantially.
The present invention can effectively handle the iron content of industries such as ferrous metallurgy, smelting or contain coke powder, contains the waste residue or the mud of coal dust.
Claims (1)
1. the treatment process of a blast furnace dedusting ash is characterized in that it includes following processing step:
A, blast furnace dedusting ash is added the water pulping, allow this slurry in first step flotation machine, mix and carry out flotation, the pulp separation that carbon containing is more is come out with flotation agent;
B, the slurry that isolated carbon containing in the first step flotation machine is more carry out flotation again in the flotation machine of the second stage, continue to isolate the coke powder than higher-grade;
C, the tail slurry in the first step, the second stage flotation machine inserted in the first step spiral concentration basin carry out gravitational segregation, iron powder is separated;
D, the tail slurry in the first step spiral concentration basin is inserted in the spiral concentration basin of the second stage, carry out gravitational segregation again, isolate the higher iron powder of iron content;
E, the tail slurry of second stage spiral concentration basin is passed through magnetic separation again, further sub-elect iron powder;
F, the moisture content of above-mentioned each gained isolate is inserted settling tank precipitation, the waste water that settling tank is overflowed is inserted pressure filter and is carried out press filtration, obtains thin iron powder wherein, and the water that leaches is added the pulping that is used in the A step initiate blast furnace dedusting ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102002110A CN1313626C (en) | 2005-04-05 | 2005-04-05 | Method for treating blast furnace dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102002110A CN1313626C (en) | 2005-04-05 | 2005-04-05 | Method for treating blast furnace dust |
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| Publication Number | Publication Date |
|---|---|
| CN1699606A true CN1699606A (en) | 2005-11-23 |
| CN1313626C CN1313626C (en) | 2007-05-02 |
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| CNB2005102002110A Expired - Fee Related CN1313626C (en) | 2005-04-05 | 2005-04-05 | Method for treating blast furnace dust |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234766B (en) * | 2008-03-03 | 2010-06-02 | 北京科技大学 | Method for producing potassium chloride by steel enterprise sintering electro-precipitating dust |
| CN102851414A (en) * | 2012-09-24 | 2013-01-02 | 柳州市环源利环境资源技术开发有限公司 | Treatment technique of blast furnace fly ash |
| CN103131861A (en) * | 2013-03-12 | 2013-06-05 | 山东乾舜矿冶科技股份有限公司 | Integrated utilization method of ironmaking dust removal ash |
| CN104402097A (en) * | 2014-10-31 | 2015-03-11 | 武汉钢铁(集团)公司 | Blast furnace dust recycling utilization method |
| CN104874583A (en) * | 2015-05-07 | 2015-09-02 | 湖南华菱湘潭钢铁有限公司 | Comprehensive treatment method of dry reclaimed dust of blast furnace |
| CN107419045A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | The recovery method and blast furnace dedusting ash agglomerated material of blast furnace dedusting ash |
| CN107586961A (en) * | 2017-08-25 | 2018-01-16 | 鞍钢股份有限公司 | A kind of leaded dedusting ash physics method of removing lead |
| CN107586962A (en) * | 2017-08-25 | 2018-01-16 | 鞍钢股份有限公司 | A kind of reuse method of dedusting ash containing zinc |
| CN107586963A (en) * | 2017-08-25 | 2018-01-16 | 鞍钢股份有限公司 | A kind of leaded dedusting ash integrated conduct method |
| CN108517413A (en) * | 2018-03-29 | 2018-09-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of processing method of furnace cloth bag dust-removing ash |
| CN108557818A (en) * | 2018-05-03 | 2018-09-21 | 安徽顺达环保科技股份有限公司 | A method of the dedusting ash discharged using iron and steel enterprise prepares activated carbon |
| CN109622240A (en) * | 2019-01-17 | 2019-04-16 | 山东泰东环保科技股份有限公司 | A kind of flotation unit and metallurgical dedusting ash ferro element method of purification |
| CN110496699A (en) * | 2019-07-12 | 2019-11-26 | 昆明理工大学 | A method of recycling fe from ion dust mud contaning |
| CN110586318A (en) * | 2019-10-23 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for comprehensive utilization of blast furnace ash |
| CN111420809A (en) * | 2020-03-04 | 2020-07-17 | 华中科技大学 | Flotation separation method for casting dust removal ash powder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950731B2 (en) * | 1978-03-28 | 1984-12-10 | 光和精鉱株式会社 | How to recover metallic iron powder from converter dust |
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2005
- 2005-04-05 CN CNB2005102002110A patent/CN1313626C/en not_active Expired - Fee Related
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234766B (en) * | 2008-03-03 | 2010-06-02 | 北京科技大学 | Method for producing potassium chloride by steel enterprise sintering electro-precipitating dust |
| CN102851414A (en) * | 2012-09-24 | 2013-01-02 | 柳州市环源利环境资源技术开发有限公司 | Treatment technique of blast furnace fly ash |
| CN103131861A (en) * | 2013-03-12 | 2013-06-05 | 山东乾舜矿冶科技股份有限公司 | Integrated utilization method of ironmaking dust removal ash |
| CN104402097A (en) * | 2014-10-31 | 2015-03-11 | 武汉钢铁(集团)公司 | Blast furnace dust recycling utilization method |
| CN104402097B (en) * | 2014-10-31 | 2016-05-04 | 武汉钢铁(集团)公司 | A kind of resource utilization method of blast furnace dedusting ash |
| CN104874583A (en) * | 2015-05-07 | 2015-09-02 | 湖南华菱湘潭钢铁有限公司 | Comprehensive treatment method of dry reclaimed dust of blast furnace |
| CN107419045A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | The recovery method and blast furnace dedusting ash agglomerated material of blast furnace dedusting ash |
| CN107586961B (en) * | 2017-08-25 | 2019-03-26 | 鞍钢股份有限公司 | A kind of leaded dedusting ash physics method of removing lead |
| CN107586961A (en) * | 2017-08-25 | 2018-01-16 | 鞍钢股份有限公司 | A kind of leaded dedusting ash physics method of removing lead |
| CN107586962A (en) * | 2017-08-25 | 2018-01-16 | 鞍钢股份有限公司 | A kind of reuse method of dedusting ash containing zinc |
| CN107586963A (en) * | 2017-08-25 | 2018-01-16 | 鞍钢股份有限公司 | A kind of leaded dedusting ash integrated conduct method |
| CN107586962B (en) * | 2017-08-25 | 2019-03-26 | 鞍钢股份有限公司 | A kind of reuse method of dedusting ash containing zinc |
| CN108517413A (en) * | 2018-03-29 | 2018-09-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of processing method of furnace cloth bag dust-removing ash |
| CN108557818A (en) * | 2018-05-03 | 2018-09-21 | 安徽顺达环保科技股份有限公司 | A method of the dedusting ash discharged using iron and steel enterprise prepares activated carbon |
| CN108557818B (en) * | 2018-05-03 | 2021-11-19 | 安徽顺达环保科技股份有限公司 | Method for preparing activated carbon by utilizing fly ash discharged by iron and steel enterprises |
| CN109622240A (en) * | 2019-01-17 | 2019-04-16 | 山东泰东环保科技股份有限公司 | A kind of flotation unit and metallurgical dedusting ash ferro element method of purification |
| CN110496699A (en) * | 2019-07-12 | 2019-11-26 | 昆明理工大学 | A method of recycling fe from ion dust mud contaning |
| CN110586318A (en) * | 2019-10-23 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for comprehensive utilization of blast furnace ash |
| CN110586318B (en) * | 2019-10-23 | 2022-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for comprehensive utilization of blast furnace ash |
| CN111420809A (en) * | 2020-03-04 | 2020-07-17 | 华中科技大学 | Flotation separation method for casting dust removal ash powder |
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| CN1313626C (en) | 2007-05-02 |
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