CN102747228A - Method for recycling valuable elements from blast furnace gas mud - Google Patents
Method for recycling valuable elements from blast furnace gas mud Download PDFInfo
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- CN102747228A CN102747228A CN2012102488330A CN201210248833A CN102747228A CN 102747228 A CN102747228 A CN 102747228A CN 2012102488330 A CN2012102488330 A CN 2012102488330A CN 201210248833 A CN201210248833 A CN 201210248833A CN 102747228 A CN102747228 A CN 102747228A
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- flotation
- zinc
- mine tailing
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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
Abstract
The invention relates to a method for recycling valuable elements from blast furnace gas mud. The method for pretreating low-grade blast furnace gas mud comprising 3-8% of zinc by adopting the flotation-magnetic separation process to recycle valuable elements comprises flotation and magnetic separation process or magnetic separation and flotation process. The method has the advantages of simple process, low energy consumption, low production cost and excellent comprehensive recycling effect. The grade of the selected iron ore concentrate reaches the grade of the sintering ore, the zinc-rich material is used for extracting zinc by the zinc smelting plants, and the carbon ore concentrate is used for producing by the iron and steel enterprises.
Description
Technical field
The present invention relates to the method and technology field of the floating technology of a kind of employing magnetic with valuable element comprehensive reutilization in the blast furnace gas mud (ash).
Background technology
The dust that blast furnace gas mud (ash) is discharged with coal gas when being blast-furnace smelting, each factory's gas mud composition has bigger difference, but main recovery wherein has its general character to picture and physical features, mainly shows as; The iron grade is on the low side, directly utilizes difficulty; The fluctuation of zinc content is big, because of receiving the fluctuation of zinc content in round-robin number of times, the raw material in blast furnace of its zinc, causes the zinc content big; Carbon content is higher, generally about 20%; Raw meal particle size is superfine, and forms coarse grain and contain the characteristic that charcoal height, particulate contain zinc height (in the 0.045mm grade, its distributive law reaches 74.79%), and also finding simultaneously has suitable part zinc in reduction process, to be deposited on the carbon granule.
The processing mode of existing blast furnace gas mud (ash) abroad mainly contains: swirler-dezincify method and metallized pellet method.
Swirler-dezincify method is low because of the dezincify rate, it is big and can not utilize to improve iron grade amplitude sludge quantity little, after handling, causes secondary pollution problems, so less employing.The metallized pellet method is because flow process is complicated, investment is very high, economic benefit is undesirable, so on using, receive certain limitation.
The mode that domestic iron and steel enterprises is handled gas mud mainly contains two kinds: a kind of is to give it up; Another kind is directly to return the sintering utilization.
Directly discarded except that causing environmental pollution, also cause the waste of resource.
When directly returning sintering work, because of the gas mud iron content not high (27～30%TFe), except that the quality that influences agglomerate; Also, gas mud just do not get into blast furnace because handling through dezincify; Make in the State of Blast Furnace zinc enrichment that constantly circulates, cause etch, influence blast furnace campaign the blast furnace lining material.
Summary of the invention
The cost that the above-mentioned existing treatment process of blast furnace gas mud (ash) exists is high in order to overcome just for the object of the invention, the defective of weak effect and the method that a kind of technology is simple, energy consumption is little, production cost is low, treatment effect is good, comprehensive utilization ratio is high is provided.
The objective of the invention is to realize through following technical scheme.
A kind of blast furnace gas mud reclaims the method for valuable element; The present invention adopts floating magnetic concentration technology pre-treatment to contain zinc: flotation--magnetic separation process method or magnetic separation---floatation process method, reclaim valuable element wherein; Wherein:
Flotation---magnetic separation process method is:
(1) blast furnace gas mud is sized mixing, its liquid-solid ratio weight ratio is respectively 2.5～3.5:1;
(2) adopt the high-gradient magnetic field operation to magneticly elect iron ore concentrate, obtain the iron ore concentrate and the mine tailing 1 of iron content >=45% respectively;
(3) mine tailing 1 is carried out magnetic separation and concentrate, its liquid-solid ratio weight ratio is respectively 2.5～3.5:1;
(4) spissated mine tailing 1 is carried out conventional carbon flotation, obtain the carbon concentrate and tailings 2 of fixed carbon >=75% respectively;
(5) carbon flotation tailings 2 is carried out rich zinc material and the mine tailing 3 that flotation obtains containing zinc＞10% again, mine tailing 3 discards;
Magnetic separation---floatation process method is:
(1) blast furnace gas mud is sized mixing, solvent and solute weight ratio is respectively than being 2.5～3.5:1;
(2) said sizing mixing carried out the carbon flotation operation, obtain containing the carbon concentrate and tailings 1 of fixed carbon>=75%
,
(3) the carbon flotation tailings 1
,Carry out the zinc flotation operation, obtain containing the rich zinc material and the mine tailing 2 of zinc＞10%
,,
(4) adopt high-gradient magnetic field to mine tailing 2
,Carry out the ferromagnetic industry that is elected to be, obtain the iron ore concentrate and the mine tailing 3 of iron content>=45%
,Mine tailing 3
,Discard.
The present invention makes through magnetic separation that the extrusion rate of zinc reaches more than 90% in the iron ore concentrate, and iron ore concentrate can directly return use.
Magnetic floats technology: blast furnace gas mud (ash) is added in the steel basin, and add tap water, be modulated into the slurries that liquid-solid ratio is 2.5～3.5:1; The magnetic separator of sending into high-gradient magnetic field carries out magnetic separation; Obtain magnetic separation product iron ore concentrate (iron content >=45%) and mine tailing, mine tailing is concentrated, making liquid-solid ratio is 2.5～3.5:1; Send into the flotation that flotation machine carries out carbon; Obtain carbon ore deposit (containing fixed carbon >=75%) and mine tailing, mine tailing gets into following one flotation operation and carries out the flotation of zinc, obtains containing the rich zinc material and the tailings of zinc＞10% at last.Through one magnetic separation and two road flotation, the amount of tailings reduces in a large number, filters the back and stacks, and flotation tail water returns the former process operation of sizing mixing.
Floating magnetic technology: blast furnace gas mud (ash) is added in the steel basin, and add tap water, be modulated into the slurries that liquid-solid ratio is 2.5～3.5:1; Send into flotation machine and select the carbon operation; Obtain carbon ore deposit (containing fixed carbon >=75%) and mine tailing, mine tailing gets into following one flotation operation and carries out the flotation of zinc, obtains containing the rich zinc material and the mine tailing of zinc＞10% at last; The magnetic separator that the mine tailing of secondary flotation is sent into high-gradient magnetic field carries out the magnetic separation of iron; Obtain magnetic separation product iron ore concentrate (iron content >=45%) and tailings, tail is looked into and is filtered the back and stack, and flotation tail water returns the former process operation of sizing mixing.
The invention has the beneficial effects as follows that technology is simple, energy consumption is little, production cost is low, the comprehensive reutilization effect is splendid, the iron ore concentrate of selecting reaches the grade of agglomerate, and rich zinc material is used for the zinc smeltery and extracts zinc, and the carbon ore deposit can be used for the production of iron and steel enterprise.
Description of drawings
Fig. 1 is flotation---magnetic separation process schema;
Fig. 2 is magnetic separation---flotation process figure.
Embodiment
See Fig. 1; A kind of blast furnace gas mud reclaims the method for valuable element; Technical characterictic of the present invention is that the process method that adopts the ore-dressing technique pre-treatment to contain the low-grade blast furnace gas mud of zinc 3～8% is: flotation--magnetic separation process method or magnetic separation---floatation process method, reclaim valuable element wherein; Wherein:
Flotation---magnetic separation process method is:
(1) blast furnace gas mud is sized mixing, its liquid-solid ratio weight ratio is respectively 2.5～3.5:1;
(2) adopt the high-gradient magnetic field operation to magneticly elect iron ore concentrate, obtain the iron ore concentrate and the mine tailing 1 of iron content >=45% respectively;
(3) mine tailing 1 is carried out magnetic separation and concentrate, its liquid-solid ratio weight ratio is respectively 2.5～3.5:1;
(4) spissated mine tailing 1 is carried out the carbon flotation, obtain the carbon concentrate and tailings 2 of fixed carbon >=75% respectively;
(5) carbon flotation tailings 2 is carried out rich zinc material and the mine tailing 3 that flotation obtains containing zinc＞10% again, mine tailing 3 discards;
See Fig. 2, magnetic separation---floatation process method is:
(1) blast furnace gas mud is sized mixing, solvent and solute weight ratio is respectively than being 2.5～3.5:1;
(2) said sizing mixing carried out the carbon flotation operation, obtain containing the carbon concentrate and tailings 1 of fixed carbon>=75%
,
(3) the carbon flotation tailings 1
,Carry out the zinc flotation operation, obtain containing the rich zinc material and the mine tailing 2 of zinc＞10%
,,
(4) adopt high-gradient magnetic field to mine tailing 2
,Carry out the ferromagnetic industry that is elected to be, obtain the iron ore concentrate and the mine tailing 3 of iron content>=45%
,Mine tailing 3
,Discard.
The present invention makes through magnetic separation that the extrusion rate of zinc reaches more than 90% in the iron ore concentrate, and iron ore concentrate can directly return use; Technology is simple, energy consumption is little, production cost is low, comprehensive recovery.
Magnetic floats technology: blast furnace gas mud (ash) is added in the steel basin, and add tap water, be modulated into the slurries that liquid-solid ratio is 2.5～3.5:1; The magnetic separator of sending into high-gradient magnetic field carries out magnetic separation; Obtain magnetic separation product iron ore concentrate (iron content >=45%) and mine tailing, mine tailing is concentrated, making liquid-solid ratio is 2.5～3.5:1; Send into the flotation that flotation machine carries out carbon; Obtain carbon ore deposit (containing fixed carbon >=75%) and mine tailing, mine tailing gets into following one flotation operation and carries out the flotation of zinc, obtains containing the rich zinc material and the tailings of zinc＞10% at last.Through one magnetic separation and two road flotation, the amount of tailings reduces in a large number, filters the back and stacks, and flotation tail water returns the former process operation of sizing mixing.
Floating magnetic technology: blast furnace gas mud (ash) is added in the steel basin, and add tap water, be modulated into the slurries that liquid-solid ratio is 2.5～3.5:1; Send into flotation machine and select the carbon operation; Obtain carbon ore deposit (containing fixed carbon >=75%) and mine tailing, mine tailing gets into following one flotation operation and carries out the flotation of zinc, obtains containing the rich zinc material and the mine tailing of zinc＞10% at last; The magnetic separator that the mine tailing of secondary flotation is sent into high-gradient magnetic field carries out the magnetic separation of iron; Obtain magnetic separation product iron ore concentrate (iron content >=45%) and tailings, tail is looked into and is filtered the back and stack, and flotation tail water returns the former process operation of sizing mixing.
Experimental result:
Composition analysis, sreen analysis and the experimental result of blast furnace gas mud (ash) seen table 1,2,3.
Table 1 gas mud Chemical Composition analytical results
| Element | TFe | SiO 2 | C | TiO 2 | CaO | Al 2O 3 | Zn | MgO |
| Content | 27.70 | 10.37 | 19.99 | 6.10 | 5.94 | 4.21 | 2.36 | 2.30 |
| Element | MnO | S | Pb | P | Cu | Co | Ni | Cr |
| Content | 0.43 | 0.27 | 0.11 | 0.032 | 0.015 | <0.01 | <0.01 | <0.01 |
Table 2 gas mud results of grain size analysis
Table 3 flotation-magnetic separation and magnetic separation-flotation process is handled the key technical indexes contrast of gas mud:
More than two kinds of combined sorting technical process compare, its main economic and technical indices variance analysis is following:
(1) floating-magnetic process program iron recovery is higher than magnetic-floating process program, and zinc, the carbon recovery are close;
Iron concentrate grade differs very little in (2) two kinds of process programs, but the iron ore concentrate zinc content is a little more than magnetic-floating technology in floating-magnetic technology, and the zinc ore concentrate grade is higher than magnetic-floating technology in floating-magnetic technical process, and in the carbon ore deposit fixed carbon content floating-magnetic technology is low.
(3) in magnetic-floating process program; Because magnetic separation is at the preceding material of having deviate from 52% productive rate; So it is half the to get into the also corresponding minimizing of material of flotation operation, thus the configuration of floatation equipment and flotation reagent amount ratio floating-minimizing of magnetic technology is about half, the flotation operation cost also will reduce.
The technical indicator of comprehensive above two process programs, its selected technical process all reach in iron ore concentrate iron grade >=45% (suitable with grade of sinter), the carbon ore deposit index of zinc grade＞10% in fixed carbon content >=75%, the rich zinc material.The extrusion rate of zinc all reaches 70% in the iron ore concentrate, helps iron ore concentrate and returns sintering work recycling iron, blast furnace lining is not produced detrimentally affect simultaneously.The raising of rich zinc material grade makes the recycling of zinc more reasonable from economically.Reclaimed carbon simultaneously, favorable economic benefit and social benefit have been arranged.
Magnetic-floating associating pretreatment technology enrichment, when reclaiming in the gas mud valuable component, can smelt the situation of recovery technology according to actual content, distribution and the rear portion of each factory's gas mud composition and carry out reasonable combination.When zinc content in the gas mud was low, then to reclaim iron, carbon, the zinc that removes in the iron ore concentrate was main purpose.When zinc content is high in the gas mud; Can consider that then three kinds of products all reclaim, the benefit that at this moment reclaims zinc will be very significant, for example some raw materials contained the high middle minimill of zinc; Picture Nanchang Iron and Steel Works, Xinyu Iron and Steel Works, Liu Gang and Hangzhou Steel Company etc.; Contain zinc in its gas mud up to more than 10%, as adopt this result of study can obtain to contain the high zinc ore concentrate of zinc, particularly to containing zinc than present low gas mud better processing effect.Therefore its preconditioning technique scheme of finally confirming can be directed against the actual raw material condition of each Iron And Steel Plant, adopts the integration of operation of single magnetic separation, flotation or magnetic separation and flotation flexibly.
Claims (2)
1. a blast furnace gas mud reclaims the method for valuable element; It is characterized in that: adopt floating magnetic concentration technology pre-treatment to contain zinc to be in the process method of 3～8% low-grade blast furnace gas mud: flotation--magnetic separation process method or magnetic separation---floatation process method, reclaim valuable element wherein; Wherein:
Flotation---magnetic separation process method is:
(1) blast furnace gas mud is sized mixing, its liquid-solid ratio weight ratio is respectively 2.5～3.5:1;
(2) adopt the high-gradient magnetic field operation to magneticly elect iron ore concentrate, obtain the iron ore concentrate and the mine tailing 1 of iron content >=45% respectively;
(3) mine tailing 1 is carried out magnetic separation and concentrate, its liquid-solid ratio weight ratio is respectively 2.5～3.5:1;
(4) spissated mine tailing 1 is carried out conventional carbon flotation, obtain the carbon concentrate and tailings 2 of fixed carbon >=75% respectively;
(5) carbon flotation tailings 2 is carried out rich zinc material and the mine tailing 3 that flotation obtains containing zinc＞10% again, mine tailing 3 discards;
Magnetic separation---floatation process method is:
(1) blast furnace gas mud is sized mixing, solvent and solute weight ratio is respectively than being 2.5～3.5:1;
(2) said sizing mixing carried out the carbon flotation operation, obtain containing the carbon concentrate and tailings 1 of fixed carbon>=75%
,
(3) the carbon flotation tailings 1
,Carry out the zinc flotation operation, obtain containing the rich zinc material and the mine tailing 2 of zinc＞10%
,,
(4) adopt high-gradient magnetic field to mine tailing 2
,Carry out the ferromagnetic industry that is elected to be, obtain the iron ore concentrate and the mine tailing 3 of iron content>=45%
,Mine tailing 3
,Discard.
2. weigh the method that 1 described a kind of blast furnace gas mud reclaims valuable element according to claim, it is characterized in that, make through magnetic separation that the extrusion rate of zinc reaches more than 90% in the iron ore concentrate, iron ore concentrate can directly return use.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104258981A (en) * | 2014-09-15 | 2015-01-07 | 中冶北方（大连）工程技术有限公司 | Franklinite screening process |
| CN106311456A (en) * | 2016-08-31 | 2017-01-11 | 蒋朋钢 | Method for recovering iron concentrates and non-ferrous metals by virtue of head ash of sintering machine |
| 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 |
| 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 |
| CN110813521A (en) * | 2019-10-15 | 2020-02-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering carbon, iron and zinc from blast furnace gas ash |
| CN113637851A (en) * | 2021-07-29 | 2021-11-12 | 何刚 | Method for comprehensively recovering valuable elements by combining blast furnace cloth bag ash and sintering machine head ash |
| CN114314638A (en) * | 2021-12-29 | 2022-04-12 | 阜新成泰环保科技有限公司 | Process for producing glaze-grade zinc oxide by using blast furnace gas ash |
| CN115608517A (en) * | 2021-02-05 | 2023-01-17 | 李刚强 | Efficient separation method for blast furnace cloth bag dedusting ash |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104258981A (en) * | 2014-09-15 | 2015-01-07 | 中冶北方（大连）工程技术有限公司 | Franklinite screening process |
| CN104258981B (en) * | 2014-09-15 | 2016-08-24 | 中冶北方（大连）工程技术有限公司 | A kind of franklinite sorting process |
| CN106311456A (en) * | 2016-08-31 | 2017-01-11 | 蒋朋钢 | Method for recovering iron concentrates and non-ferrous metals by virtue of head ash of sintering machine |
| CN110813521A (en) * | 2019-10-15 | 2020-02-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering carbon, iron and zinc from blast furnace gas ash |
| CN110813521B (en) * | 2019-10-15 | 2021-12-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering carbon, iron and zinc from blast furnace gas ash |
| 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 |
| 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 |
| CN115608517A (en) * | 2021-02-05 | 2023-01-17 | 李刚强 | Efficient separation method for blast furnace cloth bag dedusting ash |
| CN113637851A (en) * | 2021-07-29 | 2021-11-12 | 何刚 | Method for comprehensively recovering valuable elements by combining blast furnace cloth bag ash and sintering machine head ash |
| CN114314638A (en) * | 2021-12-29 | 2022-04-12 | 阜新成泰环保科技有限公司 | Process for producing glaze-grade zinc oxide by using blast furnace gas ash |
| CN114314638B (en) * | 2021-12-29 | 2024-03-01 | 阜新成泰环保科技有限公司 | Process for producing glaze-grade zinc oxide by using blast furnace gas ash |
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Application publication date: 20121024 |