CN103866131B - A kind of containing zinc blast furnace dedusting ash renewable resources treatment process - Google Patents
A kind of containing zinc blast furnace dedusting ash renewable resources treatment process Download PDFInfo
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- CN103866131B CN103866131B CN201410092856.6A CN201410092856A CN103866131B CN 103866131 B CN103866131 B CN 103866131B CN 201410092856 A CN201410092856 A CN 201410092856A CN 103866131 B CN103866131 B CN 103866131B
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Abstract
A kind of containing zinc blast furnace dedusting ash renewable resources method, belong to field of steel production, it is characterized in that: control reduction temperature, reducing atmosphere and recovery time, meticulous reducing apparatus will be reduced containing zinc in zinc blast furnace dedusting ash, ferriferous oxide through pretreated, owing to reduction temperature is lower than 1050 DEG C, there is not sintering and melting in reduction process. The zinc that reduction generates is overflowed in a gaseous form and is collected to obtain rich zinc product through particle collector, and the powdered iron that reduction generates is present in solid residue can all for preparing sweetening agent, and no longer generation two solid wastes are polluted. The present invention will reduced lower than 1050 DEG C containing zinc blast furnace dedusting ash, there is not melting or sintering in reduction process, after reduction, the rich iron resistates of solid and the gaseous state high zinc product that volatilizees is still pulverulent material, all do not produce sintering, process energy consumption is very low, do not produce two solid wastes such as slag, environmental friendliness, have good economic benefit.
Description
Technical field
The invention belongs to the reutilization field of the solid waste of Iron and Steel Production, specifically containing zinc blast furnace dedusting ash renewable resources method.
Background technology
It is that the iron and steel flow process of raw material is often produced one ton of pig iron taking iron ore, produce about 10Kg blast furnace dedusting ash accordingly, wherein contain the ferro element of about 30% and a certain amount of zinc element, it is respectively: low zinc dedusting ash (Zn < 1%), in low zinc dedusting ash (1% < Zn < 4%), middle zinc dedusting ash (4% < Zn < 8%), middle high zinc dedusting ash (8% < Zn < 20%), high zinc dedusting ash (20% < Zn) five grades.
China produces the pig iron about 600,000,000 tons every year in recent years, producing blast furnace dedusting ash is 6,000 ten thousand tons, this is the huge amount solid waste to severe environmental pollution, the application is carried out renewable resources process, not only significantly reduce the carrying capacity of environment of iron and steel enterprise, annual also obtainable stock number is: ferro element 1,800 ten thousand tons, zinc element 2,400,000 tons, brings considerable economic benefit.
At present, process has following several containing zinc blast furnace dedusting ash main method:
(1) directly return as raw materials for sintering: be only applicable to process low zinc blast furnace dedusting ash. Main drawback has: the Iron grade of agglomerate and decrease in intensity; Dust increases ironmaking alkali load containing the element such as potassium, sodium; The ventilation property of the bed of material is deteriorated, and production capacity declines.
(2) solidification or landfill: this method is forbidden gradually. Not only land occupation resource, causes environmental pollution, and in dedusting ash, iron, zinc resource are not recycled and waste.
(3) rotary kiln or rotary hearth furnace technology, this technology is comparatively ripe, zinc, iron resources in energy recycled dust removing ashes. But treating processes temperature height (1200 DEG C ~ 1350 DEG C), energy consumption are big; Needing to carry out the pre-treatment such as agglomeration (ball), additionally with addition of coal dust, cost is higher;Burning and reduction, in a space reactor, cause the reductibility of atmosphere not high, and the degree of metalization of iron and dezinc degree are not high. Rotary hearth furnace can only process the dedusting ash that Zn content is lower and iron level is higher; The easy ring formation of rotary kiln technology in addition, rotary hearth furnace bias waits equipment problems affect production direct motion.
(4) technology is soaked in acid (alkali), middle and high zinc dedusting ash can only be processed, and the leaching yield of zinc is low, in leaching slag, remaining Zn content is higher, and steel mill is difficult to be recycled by leaching slag, consumes leaching agent in production in a large number, equipment corrosion is serious, working condition is poor, production cost height, and in technique, the introducing of sulphur, chlorine causes new environmental pollution.
Summary of the invention
The present invention is using blast furnace ironmaking dedusting ash powder as resource, and mean particle size is 20um(1um ~ 100um), the meticulous reduction technique being applicable to invention gives renewable resources.
A kind of containing zinc blast furnace dedusting ash renewable resources treatment process, it is characterized in that control reduction temperature, reducing atmosphere and recovery time, meticulous reducing apparatus zinc, ferriferous oxide will be reduced in pretreated dedusting ash, the zinc that reduction generates volatilizees in a gaseous form and leaves solid residue, the iron that reduction generates is present in solid residue in solid form, use particle collector that it is carried out condensation enrichment, reach the separation and concentration effect of zinc and iron, reduzate is carried out aftertreatment and does not produce two solid wastes.
(1) pre-treatment: drying containing zinc blast furnace dedusting ash, simple grinding, obtain siccative fine powder dirt after screening, its controling parameters is:
1) bake out temperature: 120 �� 10 DEG C;
2) sieve specification: 100 orders, removes large granular materials.
(2) control reduction: siccative dust pre-treatment obtained is placed in meticulous reducing apparatus and leads to and reduced into reducing gas, and its controling parameters is:
1) reduction temperature: 900 ~ 1050 DEG C;
2) gas reduction:;
3) recovery time: fixed bed 1 ~ 2h, moving-bed 10 ~ 20min;
Reducing gas is blast furnace gas or hydrogen, and its reductibility is decided to be, for ensureing its enough strong reductibility, blast furnace gas need to be carried out reformation process, reformation parameter is:
1) reformation agent: blue carbon or coke (fixed carbon >=80%);
2) reforming temperature: 950 ~ 1200 DEG C.
(3) meticulous reduction: the solid residue that meticulous reduction produces is about the 50% ~ 70% of original material amount, allocates appropriate lime into and makes steel-making refining desulfuration agent, and controling parameters is:
1) lime composition: CaO >=80%;
2) quaternary basicity in finished product sweetening agent: 2 ~ 3;
3) in finished product sweetening agent: FeO��1%;
The enrichment of high zinc volatility product that meticulous reduction produces: the zinc after reduction volatilizees in a gaseous form effusion at 900 ~ 1050 DEG C, cools, through particle collector, its enrichment is obtained the higher rich zinc product of purity, wherein contains the KCl of 10% ~ 15%, leachable through washing.
The meticulous reduction moving-bed device used with above-mentioned complete sets of Techniques and fixed bed device, respectively as shown in accompanying drawing 1, accompanying drawing 2, mainly comprise: 1 source nitrogen, 2 blast furnace gas sources, 3 coal gas reforming furnaces, 4 gas meters, 5 gas mixing chambers, 6 moving-bed reduction furnaces, 7 housings, 8 thermopairs, 9 particle collectors, 10 sources of hydrogen, 11 fixed bed reduction furnaces, 12 crucibles. Gas source, under meter, gas mixing chamber, (moving-bed or fixed bed) reduction furnace are connected by gas pipeline, and housing, thermopair, (moving-bed or fixed bed) reduction furnace are connected by electric wire, and particle collector is fixed on air outlet.
The meticulous reduction process of its moving-bed is: lead to into nitrogen protection; reduction furnace, reforming furnace heat up simultaneously; it is incubated to preset temperature; lead to into blast furnace gas; add by feeding mouth and reduce in reduction furnace containing zinc blast furnace dedusting ash; after when reaching reduction, rich iron solid residue is discharged from discharge port, and gaseous state height zinc volatile matter is deposited on particle collector.
The meticulous reduction process of its fixed bed is: be placed in reduction furnace containing zinc blast furnace dedusting ash, leads to into nitrogen protection, and reduction furnace heats up; it is incubated to preset temperature; leading to into hydrogen, after reaching the recovery time, rich iron solid residue is taken out in cooling, and gas height zinc volatile matter is deposited on particle collector.
Advantage of the present invention is being reduced containing zinc blast furnace dedusting ash lower than 1050 DEG C, there is not melting in reduction process, after reduction the rich iron resistates of solid and gaseous state height zinc volatility product are still pulverulent material, all do not produce sintering, process energy consumption is very low, not producing two solid wastes such as slag, environmental friendliness degree is very high, and therefore economic benefit prospect is very good.
Accompanying drawing explanation
Fig. 1 is the meticulous reducing apparatus schematic diagram of moving-bed, and Fig. 2 is the meticulous reducing apparatus schematic diagram of fixed bed:
Note: 1 source nitrogen in figure, 2 blast furnace gas sources, 3 coal gas reforming furnaces, 4 gas meters, 5 gas mixing chambers, 6 moving-bed reduction furnaces, 7 housings, 8 thermopairs, 9 particle collectors, 10 sources of hydrogen, 11 fixed bed reduction furnaces, 12 crucibles. Gas source, under meter, gas mixing chamber, (moving-bed or fixed bed) reduction furnace are connected by gas pipeline, and housing, thermopair, (moving-bed or fixed bed) reduction furnace are connected by electric wire, and particle collector is fixed on air outlet.
Fig. 3 is for containing zinc blast furnace dedusting ash siccative particle size distribution figure:
Note: in figure, q is size-grade distribution; Q is cumulative distribution
Fig. 4 is for containing solid residue particle size distribution figure after the meticulous reduction of zinc blast furnace dedusting ash:
Note: in figure, q is size-grade distribution; Q is cumulative distribution
Concrete implementation content
Specific embodiment of the invention content is to pretreated Tang Gang group ironmaking Bu Bei district 3# blast furnace dust 100g(TFe=32.6%, Zn=3.9%) carry out renewable resources process:
(1) blast furnace dedusting ash pre-treatment: 120 DEG C of oven dry, simply grind, screening (100 order) obtains thin siccative 100g.
(2) containing the meticulous reduction of zinc blast furnace dedusting ash (fixed bed): by dedusting ash at 910 ~ 980 DEG C of temperature and pure H2Being reduced, in process, state modulator is as follows:
1) reduction temperature: 910 DEG C, 980 DEG C;
2) reducing atmosphere: pure H2;
3) recovery time: 1h, 2h.
Obtaining solid residue 62.5g, the wherein degree of metalization more than 95% of iron after reduction, Zn content less than 0.1%, dezinc degree more than 98%, before and after reduction there is not sintering phenomenon (see Fig. 3, Fig. 4) in material.
(3) reduzate aftertreatment: allocating solid residue after reduction into appropriate lime and make refining desulfuration agent, controling parameters is as follows:
1) lime composition: CaO >=80%;
2) in finished product sweetening agent, quaternary is slowed down: 2 ~ 3;
3) in finished product sweetening agent: FeO��1%;
Make sweetening agent 222.6g, can be used for steel-making refining desulfuration agent.
Gaseous volatile after reduction is collected containing the rich zinc product 3.1g of zinc 72% by particle collector.
By the present invention to Tang Gang ironmaking Bu Bei district 3# blast furnace dedusting ash 100g renewable resources process, the high zinc powder dirt 3.1g of refining desulfuration agent 222.6g and zinc content 72% can be obtained respectively, it is achieved that utilize containing zinc blast furnace dedusting ash renewable resources.
Claims (2)
1. one kind contains zinc blast furnace dedusting ash renewable resources treatment process, it is characterized in that control reduction temperature, reducing atmosphere and recovery time, meticulous reducing apparatus zinc, ferriferous oxide will be reduced in pretreated dedusting ash, the zinc that reduction generates volatilizees in a gaseous form and leaves solid residue, the iron that reduction generates is present in solid residue in solid form, use particle collector that it is carried out condensation enrichment, reach the separation and concentration effect of zinc and iron, reduzate is carried out aftertreatment and does not produce two solid wastes;Concrete implementation step is as follows:
(1) pre-treatment: drying containing zinc blast furnace dedusting ash, simple grinding, obtain siccative fine powder dirt after screening, controling parameters is:
1) bake out temperature: 120 �� 10 DEG C;
2) sieve specification: 100 orders, removes large granular materials;
(2) control reduction: siccative dust pre-treatment obtained is placed in meticulous reducing apparatus and leads to and reduced into reducing gas, and controling parameters is:
1) reduction temperature: 900 ~ 1050 DEG C;
2) gas reduction:;
3) recovery time: fixed bed 1 ~ 2h, moving-bed 10 ~ 20min;
(3) meticulous reduction: the solid residue that meticulous reduction produces is the 50% ~ 70% of original material amount, allocates appropriate lime into and makes steel-making refining desulfuration agent, and controling parameters is:
1) lime composition: CaO >=80%;
2) quaternary basicity in finished product sweetening agent: 2 ~ 3;
3) in finished product sweetening agent: FeO��1%;
The enrichment of high zinc volatility product that meticulous reduction produces: the zinc after reduction volatilizees in a gaseous form effusion at 900 ~ 1050 DEG C, cools, through particle collector, its enrichment is obtained the higher rich zinc product of purity, wherein contains the KCl of 10% ~ 15%, leachable through washing.
2. a kind of containing zinc blast furnace dedusting ash renewable resources treatment process as claimed in claim 1, it is characterised in that reducing gas is blast furnace gas or hydrogen, and its reductibility is decided to be, for ensureing its enough strong reductibility, blast furnace gas need to be carried out reformation process, reformation parameter is:
1) reformation agent: blue carbon or coke, fixed carbon >=80%;
2) reforming temperature: 950 ~ 1200 DEG C.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106282586B (en) * | 2016-11-11 | 2018-05-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilize the device and method of electrical heating rotary kiln processing blast furnace dedusting ash |
| CN107326185A (en) * | 2017-07-13 | 2017-11-07 | 贵州仙劲锌业有限公司 | A kind of low-temperature environment-friendly smelting process of the cadmium of lead containing zinc-iron dangerous waste material |
| CN107385222B (en) * | 2017-09-18 | 2019-04-09 | 宝钢德盛不锈钢有限公司 | The carbon containing dedusting ash reuse method of rotary kiln and carbon containing dedusting ash reclaiming system |
| CN114480857A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Method for recovering valuable metals in gasified ash |
| CN112413597B (en) * | 2020-11-17 | 2023-02-03 | 北京中航天业科技有限公司 | Process for recycling dedusting ash in waste steel processing industry |
| CN113249581A (en) * | 2021-04-22 | 2021-08-13 | 张家港宏昌钢板有限公司 | Treatment method of secondary dedusting ash of blast furnace |
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| JPS6160837A (en) * | 1984-08-31 | 1986-03-28 | Sumitomo Metal Ind Ltd | Processing method of blast furnace dust |
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