CN102851414A - Treatment technique of blast furnace fly ash - Google Patents

Treatment technique of blast furnace fly ash Download PDF

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Publication number
CN102851414A
CN102851414A CN2012103559723A CN201210355972A CN102851414A CN 102851414 A CN102851414 A CN 102851414A CN 2012103559723 A CN2012103559723 A CN 2012103559723A CN 201210355972 A CN201210355972 A CN 201210355972A CN 102851414 A CN102851414 A CN 102851414A
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China
Prior art keywords
blast furnace
slurry
tail
water
dedusting ash
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CN2012103559723A
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Chinese (zh)
Inventor
莫明娇
潘智斌
张庆忠
龙顺红
卢山
周永新
刘舜
郑文辉
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LIUZHOU HUANYUANLI ENVIRONMENT RESOURCE TECHNOLOGY DEVELOPMENT Co Ltd
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LIUZHOU HUANYUANLI ENVIRONMENT RESOURCE TECHNOLOGY DEVELOPMENT Co Ltd
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Priority to CN2012103559723A priority Critical patent/CN102851414A/en
Publication of CN102851414A publication Critical patent/CN102851414A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies

Abstract

The invention discloses a treatment technique of blast furnace fly ash and belongs to the technical field of metallurgy. The treatment technique includes the steps of mixing the blast furnace fly ash and water to make slurry; dropwise adding a certain amount of foaming agent and collecting agent in the slurry, performing buffer stabilization to subject the slurry to flotation in a flotation machine, and separating to obtain carbon powder; allowing tail slurry treated by the flotation machine to enter a primary gravity concentrator for separation so as to obtain powdered iron, middling and tail slurry, and collecting the powered iron; pumping the middling into a magnetic separator for further separation, and collecting separated powdered iron; allowing tailings from the magnetic separator to enter a secondary gravity concentrator for re-separation to obtain powdered iron, middling and tail slurry, collecting the powdered iron, allowing the middling to flow into the magnetic separator and the secondary gravity concentration for cyclic separation, and separating all the tail slurry to obtain finished tail mud and water; and using the separated water to make slurry for cycle use. Compared with the prior art, the treatment technique has the advantages that the efficiency in treating blast furnace fly ash is high, separating rate of beneficial components is high, and the yield is high.

Description

The treatment process method of blast furnace dedusting ash
Technical field
The present invention relates to metallurgical technology field, especially a kind of processing method of processing the exhaust gas dust that iron-making production produces.
Background technology
Iron-smelting blast furnace contains a lot of dust in the waste gas that production process produces, these dust are generally all collected by dry process such as gravitational dust collection, bag-type dusts when outwards discharging, and sometimes adopts wet processing to collect.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 larger, can not be used as Pyrite in The Proportioning, can not allocate into as coke powder, therefore most of steel mill does not all utilize well, only has 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 100,000,000 tons, and the blast furnace dedusting ash annual emissions is estimated more than 1,000 ten thousand 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, the domestic the whole bag of tricks that only has indivedual steel mills blast furnace dedusting ash to be carried out extracting coke powder and iron powder, be called " treatment process of blast furnace dedusting ash " (patent publication No.: CN1699606 such as name, open day: November 23 in 2005), the method is that blast furnace dedusting ash is added the water pulping, allows slurry separate after first, second flotation and obtains high-grade coke powder; And out the more slurry of iron content in the first step, the second stage flotation machine pumped into first and second grade spiral chute again, after gravity preparation, magnetic separation, isolate respectively high-grade iron powder; Simultaneously, the waste water in the production process through press filtration, is reclaimed tiny iron powder, the water that leaches is used further to the pulping of blast furnace dedusting ash.Its cost is high, and processing efficiency is not good, per hour only can process 6 tons of blast furnace dedusting ash, and the carbon dust of sorting and iron powder yield poorly, and the carbon dust that annual sorting is reclaimed is 10,000 tons of 2 kilotons, iron powders.
Summary of the invention
The treatment process method that the purpose of this invention is to provide a kind of blast furnace dedusting ash, this method can solve the problem that the prior art processing efficiency is not good and yield poorly.
In order to address the above problem, the technical solution used in the present invention is: the treatment process method of this blast furnace dedusting ash may further comprise the steps:
A, pulping: blast furnace dedusting ash and water mix and blend are formed slurry;
B, sorting carbon dust: in slurry, be added dropwise to a certain amount of pore forming material and collecting agent, again through the buffering stabilizing treatment, allow slurry in flotation machine, carry out flotation after stirring, sub-elect carbon dust;
C, sorting iron fine powder: the tail slurry of processing through flotation machine enters the one-level gravity concentrator and processes, and is separated into iron fine powder, chats and tail slurry, collects the iron fine powder; Chats pumps into the further sorting of magnetic separator, collects the iron fine powder that sub-elects; Enter the secondary gravity concentrator by magnetic separator mine tailing out and process, Re-isolation becomes iron fine powder, chats and tail slurry, collects the iron fine powder, and chats flows into magnetic separator again; The chats that one gravity concentrator, secondary gravity concentrator are separated enters magnetic separator and secondary gravity concentrator circulation sorting, tap a blast furnace fine powder and being collected of sorting;
D, separation tail mud: the B step is separated with all tail slurries that the C step produces, tail slurry is separated forming tail mud product and water;
E, recycling: reclaim isolated water, add the pulping that is used in the A step the blast furnace dedusting ash of new adding.
In the technique scheme, technical scheme can also be more specifically: the blast furnace dedusting ash in the A step and water weight ratio are 1.5:1; Among the step B, in blast furnace dedusting ash per ton, be added dropwise to pore forming material 0.2L and collecting agent 0.1L.
Further, described collecting agent is LIGHT DIESEL OIL.
Further, the separation in the D step is that tail slurry is at first pumped into the sand water separator, isolates thick slag and low dirt water, low dirt water is sent into the mud water segregator again, be added dropwise to polymeric flocculant, isolate thin slag and clear water, the thick slag of collection and thin slag are described tail mud product.
Owing to having adopted technique scheme, the present invention compared with prior art has following beneficial effect:
1, only sub-elects carbon dust by a flotation behind the adding flotation reagent, shortened the sorting time; Flotation reagent adds collecting agent on the basis of pore forming material, has increased substantially the efficient of sorting carbon dust, has promoted carbon dust output; In blast furnace dedusting ash per ton, be added dropwise to pore forming material 0.2L and collecting agent 0.1L, be conducive to promote the carbon dust sorting index;
2, isolated chats and tail slurry enter magnetic separation and secondary gravity treatment successively after the gravity treatment of slurry process one-level, and constantly in magnetic separation and secondary gravity treatment circulation sorting, tail slurry then enters next step separating treatment to the chats that produces, and has improved sorting index and iron fine powder output;
3, adopt the mechanize mode to separate tail slurry, its separation efficiency is high, good separating effect, and isolated clear water can be recycled, and reaches wastewater zero discharge;
4, form carbon dust, iron fine powder, three kinds of products of tail mud product after this technical finesse, beneficiating ingredient is comprehensive reutilization very, does not produce the waste residue secondary pollution;
6, this technology per hour can be processed 45~50 tons of blast furnace dedusting ash, and a year treatment capacity can reach 350,000 tons; 80,000 tons of 3.5 ten thousand tons of carbon dusts, iron fine powders, 23.5 ten thousand tons of tail mud products that annual sorting is reclaimed.
Description of drawings
Fig. 1 is the processing technological flow figure of blast furnace dedusting ash.
Embodiment
The invention will be further described below in conjunction with accompanying drawing embodiment:
The treatment process method of blast furnace dedusting ash shown in Figure 1 includes following steps: put into 1 ton of water in stirred pot, 1.5 tons of blast furnace dedusting ash are evenly put into stirred pot mix with the water of tank, carry out high degree of agitation, mixed-shaped form slurry in stirred pot; Add flotation reagent, in slurry, be added dropwise to pore forming material 0.2L and collecting agent 0.1L stirs, the collecting agent of the present embodiment is LIGHT DIESEL OIL, the slurry that stirs is again after the buffering stabilizing treatment, supply with 6 groups of flotation machine and carry out the flotation processing, slurry carries out flotation in flotation machine, sub-elect carbon dust, utilizes the pond that carbon dust is collected; The tail slurry of processing through flotation machine enters the one-level gravity concentrator and carries out coagulation, is separated into iron fine powder, chats and tail slurry, and the iron fine powder utilizes the pond to collect; Chats pumps into the further sorting of magnetic separator, and the iron fine powder that sub-elects is collected with the pond; Enter the secondary gravity concentrator by magnetic separator mine tailing out and carry out second-stage treatment, Re-isolation becomes iron fine powder, chats and tail slurry, and isolated iron fine powder is collected with the pond, and chats flows into magnetic separator again; The chats that one gravity concentrator, secondary gravity concentrator are separated enters magnetic separator and secondary gravity concentrator circulation sorting, has improved iron fine powder sorting index and output; One-level gravity treatment and secondary gravity treatment tail slurry out enter water treatment system and process, tail slurry is at first pumped into the sand water separator, isolate thick slag and low dirt water, low dirt water is sent into the mud water segregator again, drip polymeric flocculant flocculations such as all mud, a small amount of metallic iron, impurity, carry out mud-water separation by the absorption of separator for mud and water disk, isolate thin slag and clear water, thin slag and thick slag are collected with the pond, and the thick slag of collection and thin slag form tail mud product; Isolated clear water is pumped in the stirred pot again, is used for the pulping to the blast furnace dedusting ash of new adding, forms production cycle and uses system.Buffering stabilizing treatment in the above-mentioned steps refers to slurry pumped into and cushions in the drum, and slurry flow rate is slowed down, and the stable flotation machine that flows into promotes the flotation machine stability of floatation.
The treatment process method of this blast furnace dedusting ash can be processed 45~50 tons of blast furnace dedusting ash in per 1 hour, year treatment capacity can reach 350,000 tons, per 100 tons of blast furnace dedusting ash can sub-elect the carbon dust about 10 tons, iron fine powder and 68 tons of tail mud products of 22 tons, sub-elect carbon dust fixed carbon content and reach more than 80%, the taste of iron powder is basicly stable about 78%.Wherein, carbon dust can be recycled to iron-making coal-injecting and uses, and the iron fine powder can be recycled to sintering and uses, and tail mud product can be for brick field as inside and outside fuel because of controlled certain carbon content.The present invention can go out beneficiating ingredient carbon and iron by high efficient sorting, and does not produce waste residue secondary pollution, wastewater zero discharge.

Claims (4)

1. the treatment process method of a blast furnace dedusting ash is characterized in that may further comprise the steps:
A, pulping: blast furnace dedusting ash and water mix and blend are formed slurry;
B, sorting carbon dust: in slurry, be added dropwise to a certain amount of pore forming material and collecting agent, again through the buffering stabilizing treatment, allow slurry in flotation machine, carry out flotation after stirring, sub-elect carbon dust;
C, sorting iron fine powder: the tail slurry of processing through flotation machine enters the one-level gravity concentrator and processes, and is separated into iron fine powder, chats and tail slurry, collects the iron fine powder; Chats pumps into the further sorting of magnetic separator, collects the iron fine powder that sub-elects; Enter the secondary gravity concentrator by magnetic separator mine tailing out and process, Re-isolation becomes iron fine powder, chats and tail slurry, collects the iron fine powder, and chats flows into magnetic separator again; The chats that one gravity concentrator, secondary gravity concentrator are separated enters magnetic separator and secondary gravity concentrator circulation sorting, tap a blast furnace fine powder and being collected of sorting;
D, separation tail mud: the B step is separated with all tail slurries that the C step produces, tail slurry is separated forming tail mud product and water;
E, recycling: reclaim isolated water, add the pulping that is used in the A step the blast furnace dedusting ash of new adding.
2. the treatment process method of blast furnace dedusting ash according to claim 1, it is characterized in that: the blast furnace dedusting ash in the A step and water weight ratio are 1.5:1; Among the step B, in blast furnace dedusting ash per ton, be added dropwise to pore forming material 0.2L and collecting agent 0.1L.
3. the treatment process method of blast furnace dedusting ash according to claim 1 and 2, it is characterized in that: described collecting agent is LIGHT DIESEL OIL.
4. the treatment process method of blast furnace dedusting ash according to claim 1 and 2, it is characterized in that: the separation in the D step is that tail slurry is at first pumped into the sand water separator, isolate thick slag and low dirt water, low dirt water is sent into the mud water segregator again, be added dropwise to polymeric flocculant, isolate thin slag and clear water, the thick slag of collection and thin slag are described tail mud product.
CN2012103559723A 2012-09-24 2012-09-24 Treatment technique of blast furnace fly ash Pending CN102851414A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN104226599A (en) * 2014-09-12 2014-12-24 山西太钢不锈钢股份有限公司 Blast furnace dust sorting method
CN104402097A (en) * 2014-10-31 2015-03-11 武汉钢铁(集团)公司 Blast furnace dust recycling utilization method
CN105381866A (en) * 2015-12-09 2016-03-09 华北理工大学 Beneficiation method for extracting iron and carbon from blast furnace bag dust
CN106702171A (en) * 2017-02-07 2017-05-24 山东大正节能环保科技有限公司 Process of extracting zinc from dedusting ash of blast furnace
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
CN111151373A (en) * 2019-06-17 2020-05-15 华北理工大学 Method for extracting carbon, iron and zinc from blast furnace cloth bag dust
CN111420809A (en) * 2020-03-04 2020-07-17 华中科技大学 Flotation separation method for casting dust removal ash powder
CN116140054A (en) * 2023-04-04 2023-05-23 山西通才工贸有限公司 Sorting system for metallurgical ash

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CN1699606A (en) * 2005-04-05 2005-11-23 柳州市清宇环保产业开发有限责任公司 Method for treating blast furnace dust
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CN101538096A (en) * 2009-04-24 2009-09-23 北京国油联合油田技术服务有限公司 Method for processing waste slurry

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN104226599A (en) * 2014-09-12 2014-12-24 山西太钢不锈钢股份有限公司 Blast furnace dust sorting 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
CN104402097A (en) * 2014-10-31 2015-03-11 武汉钢铁(集团)公司 Blast furnace dust recycling utilization method
CN105381866B (en) * 2015-12-09 2017-11-10 华北理工大学 Iron, the beneficiation method of carbon are extracted from furnace cloth bag dust-removing ash
CN105381866A (en) * 2015-12-09 2016-03-09 华北理工大学 Beneficiation method for extracting iron and carbon from blast furnace bag dust
CN106702171A (en) * 2017-02-07 2017-05-24 山东大正节能环保科技有限公司 Process of extracting zinc from dedusting ash of blast furnace
CN106702171B (en) * 2017-02-07 2018-05-15 山东大正节能环保科技有限公司 A kind of technique of blast furnace dedusting ash extracting zinc
CN111151373A (en) * 2019-06-17 2020-05-15 华北理工大学 Method for extracting carbon, iron and zinc from blast furnace cloth bag dust
CN111151373B (en) * 2019-06-17 2022-04-08 华北理工大学 Method for extracting carbon, iron and zinc from blast furnace cloth bag dust
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
CN116140054A (en) * 2023-04-04 2023-05-23 山西通才工贸有限公司 Sorting system for metallurgical ash

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Inventor after: Mo Mingjiao

Inventor after: Pan Zhibin

Inventor after: Zhang Qingzhong

Inventor after: Long Shunhong

Inventor after: Lu Shan

Inventor after: Zhou Yongxin

Inventor after: Liu Shun

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Application publication date: 20130102