Method for extracting Fe, Zn and Pb from electric furnace fly ash and utilizing Fe, Zn and Pb in high-value mode

A high-value, electric furnace technology, applied in the direction of solid waste removal, etc., can solve the problems of serious secondary pollution, high equipment investment cost, and low comprehensive recycling rate, so as to achieve low production cost, reduce beneficiation cost, and process flow simple effect

Inactive Publication Date: 2021-12-14
SINOSTEEL MAANSHAN INST OF MINING RES +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problems of low comprehensive recycling rate, serious secondary pollution, high equipment investment cost and low added value of products existing in the comprehensive utilization technology of dust removal dust in electric furnaces, and provide a kind of process condition with milder process conditions. , the method of extracting Fe, Zn, and Pb from electric furnace dedusting ash with simple equipment and high Fe leaching rate and making high-value utilization, the method of the present invention uses hydrothermal complexation to leach electric furnace dedusting ash and iron, and then achieves cascade recovery of Fe, Zn and Pb The purpose of Pb resources is to realize the stepwise separation and efficient extraction of Fe and Zn resources in the dust removal dust of electric furnaces

Method used

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  • Method for extracting Fe, Zn and Pb from electric furnace fly ash and utilizing Fe, Zn and Pb in high-value mode
  • Method for extracting Fe, Zn and Pb from electric furnace fly ash and utilizing Fe, Zn and Pb in high-value mode
  • Method for extracting Fe, Zn and Pb from electric furnace fly ash and utilizing Fe, Zn and Pb in high-value mode

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Effect test

Embodiment 1

[0034] Weigh 1g of dust removal dust from the electric furnace of iron and steel enterprises, prepare an oxalic acid solution with a concentration of 15%, and a liquid-solid ratio of 30:1, mix it into a uniformly distributed slurry, then inject the slurry into a three-necked flask, and then start the reaction. The specific reaction conditions are as follows: the leaching temperature is 90° C., the reaction time is 2 hours, and the stirring speed is 300 r / min.

[0035] After the reaction, the leachate was cooled to room temperature for solid-liquid separation. After the reaction product is filtered and washed, the iron-rich complex ion leaching solution A and leaching residue I are obtained, and the ferrous oxalate and zinc-rich slag in the leaching residue are fully separated by centrifugation. After ICP-AES detection, in the obtained leachate A, the concentration of Fe ions was 1602 mg / L, and the leaching rate of Fe element was converted to 92.35%; the Zn content (calculated ...

Embodiment 2

[0038] Weigh 1g of dust removal dust from the electric furnace of iron and steel enterprises, prepare oxalic acid solution with a concentration of 10%, and the liquid-solid ratio is 50:1, mix to form a uniformly distributed slurry, then inject the slurry into a three-necked flask, and then start the reaction. The specific reaction conditions are as follows: the leaching temperature is 90° C., the reaction time is 4 hours, and the stirring speed is 300 r / min.

[0039] After the reaction, the leachate was cooled to room temperature for solid-liquid separation. After the reaction product is filtered and washed, the iron-rich complex ion leaching solution A and leaching residue I are obtained, and the ferrous oxalate and zinc-rich slag in the leaching residue are fully separated by centrifugation. After ICP-AES detection, in the obtained leaching solution A, the concentration of Fe ions was 1495 mg / L, and the leaching rate of Fe element was 86.78%; the Zn content (calculated as Zn...

Embodiment 3

[0042] Weigh 1g of dust removal dust from the electric furnace of iron and steel enterprises, prepare oxalic acid solution with a concentration of 20%, and the liquid-solid ratio is 50:1, mix to form a uniformly distributed slurry, then inject the slurry into a three-necked flask, and then start the reaction. The specific reaction conditions are as follows: the leaching temperature is 90° C., the reaction time is 1 h, and the stirring speed is 300 r / min.

[0043] After the reaction, the leachate was cooled to room temperature for solid-liquid separation. After the reaction product is filtered and washed, the iron-rich complex ion leaching solution A and leaching residue I are obtained, and the ferrous oxalate and zinc-rich slag in the leaching residue are fully separated by centrifugation. After ICP-AES detection, in the obtained leachate A, the concentration of Fe ions was 1539 mg / L, and the leaching rate of Fe element was 88.38%; the Zn content (calculated as ZnO) in the lea...

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Abstract

The invention discloses a method for extracting Fe, Zn and Pb from electric furnace fly ash and utilizing Fe, Zn and Pb in a high-value mode. A large amount of dangerous waste electric furnace fly ash is used as a raw material, oxalic acid is used as a leaching agent, and a complex reaction is performed under the reaction conditions of low temperature and normal pressure, so that the purpose of stepwise separating iron and zinc resources is achieved. Under the conditions that the concentration of the oxalic acid is 5-30%, the liquid-solid ratio is 10:1-50:1, the reaction temperature is 30-90 DEG C and the reaction time is 0.5-4 h, the leaching rate of Fe in the electric furnace fly ash can reach 92% or above, the content of Zn (in terms of ZnO) in leaching residues can reach 36% or above, and the purity of finally obtained ferrous oxalate can reach 97% or above. The method is simple in process, low in energy consumption and low in reaction cost; and the obtained ferrous oxalate and zinc-rich residues have higher additional value, meanwhile, the influence on the environment is smaller, and the method has good market application prospects.

Description

technical field [0001] The invention relates to the field of solid waste treatment and resource utilization in the metallurgical industry, specifically a method for the clean extraction, resource recovery and high-value utilization of valuable elements Fe, Zn and Pb in the dust removal ash of bulk hazardous waste electric furnaces in iron and steel enterprises, especially Suitable for FeO x Content ≥ 40.0%, and mainly Fe 3+ The form exists, the ZnO content is greater than 10.0%, other main components, such as CaO, MgO, SiO 2 、Al 2 o 3 etc., the recycling and high-value utilization of metallurgical iron-containing dust with a total content of no more than 10%. Background technique [0002] The iron and steel industry is the basic industry of my country's national economy, and it is also a heavy industry with high emissions and high consumption. In normal production activities, iron and steel enterprises will produce a large amount of iron-rich solid waste, such as sinter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00Y02E60/10Y02P10/20
Inventor 汪大亚华绍广裴德健李书钦李香梅
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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