Extraction method for lead in sintering smoke dust

An extraction method and technology of smoke and dust, applied in the field of extraction of lead from sintering smoke and dust, can solve the problems of lead loss, difficulty in processing, high cost, etc., and achieve the effect of simple equipment, low cost, and good promotion prospects

Inactive Publication Date: 2017-09-08
攀枝花火凤凰再生资源回收利用有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above two patents use water leaching to extract raw materials, part of the lead enters the leaching solution in the form of lead chloride, resulting in the loss of lead in the leaching slag. At the same time, due to the low lead content in the raw materials, the cost is high when using the existing technology. High difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A. Add 1500ml of water into the beaker, according to the liquid-solid mass ratio of 1.5:1, add 1000 grams of sintering dust under stirring conditions, leaching at room temperature and stirring speed of 500rpm for 0.5h, and separate the leach residue and leachate ;

[0046] B, according to the content of lead in step A gained leachate, add the sodium chromate of theoretical quantity 100% by stoichiometry, at room temperature, stirring speed is 300rpm condition reaction 30min, obtains lead chromate product and filtrate through separation, washing; Gained The filtrate is purified, evaporated and concentrated, crystallized, and separated to obtain the potassium chloride product;

[0047] C, step A obtained leaching slag, according to the sintering soot raw material amount, add 2000 grams of 15% EDTA solution by liquid-solid mass ratio 2.0: 1, adjust material system pH to be 5.0, at room temperature, stirring speed is leaching 1.0 under the condition of 400rpm h, separating...

Embodiment 2

[0052] A. Add 1200ml of water into the beaker, according to the liquid-solid mass ratio of 1.2:1, add 1000 grams of sintering dust under stirring conditions, leaching at room temperature and stirring speed of 300rpm for 1.0h, and separate the leach residue and leachate ;

[0053] B, according to the content of lead in step A gained leachate, add the sodium chromate of theoretical quantity 100% by stoichiometry, at room temperature, stirring speed is that reaction 40min is under the condition of 200rpm, obtains lead chromate product and filtrate through separation, washing; Gained The filtrate is purified, evaporated and concentrated, crystallized, and separated to obtain the potassium chloride product;

[0054] C, step A obtained leaching slag, according to the sintering soot raw material amount, add 3000 grams of 10% EDTA solution by liquid-solid mass ratio 3.0: 1, adjust material system pH to be 7.0, at room temperature, stirring speed is leaching 1.0 under the condition of ...

Embodiment 3

[0059] A. Add 1000ml of water into the beaker, according to the liquid-solid mass ratio of 1:1, add 1000 grams of sintering dust under stirring conditions, leaching at room temperature and stirring speed of 400rpm for 0.75h, and separate the leach residue and leachate ;

[0060] B, according to the content of lead in the leach solution gained in step A, add the sodium chromate of theoretical quantity 100% by stoichiometry, at room temperature, stirring speed is that 400rpm conditions react 20min, obtain lead chromate product and filtrate through separation, washing; Gained The filtrate is purified, evaporated and concentrated, crystallized, and separated to obtain the potassium chloride product;

[0061] C, step A gained leaching slag, according to sintering soot raw material amount, add 2400 grams of 15% EDTA solution prepared by embodiment 2 step D gained filtrate by liquid-solid mass ratio 2.4: 1, adjust material system pH to be 6.0, at room temperature 1. Leach for 2.0 ho...

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Abstract

The invention discloses an extraction method for lead in sintering smoke dust and belongs to the technical field of industrial waste treatment. The technical effect that through the provided novel extraction method for the lead in the sintering smoke dust, the lead in the sintering smoke dust is completely and effectively recovered is achieved. The extraction method for the lead in the sintering smoke dust comprises the following steps that A, the sintering smoke dust is leached by added water, and a leaching agent and leaching residues are obtained through separation; B, the leaching agent obtained in the step A is subjected to deposition through sodium chromate, and a lead chromate product and a filtrate are obtained through separation; C, the leaching residues obtained in the step A are leached through an EDTA solution, and a leaching agent and leaching residues are obtained through separation; and D, the leaching agent obtained in the step C is subjected to deposition through sodium chromate, and a lead chromate product and a filtrate are obtained through separation. The process route for efficiently recovering the lead in the sintering smoke dust is provided, meanwhile, potassium chloride in the sintering smoke dust can be extracted, the sintering smoke dust is fully used, and the method has good popularization prospects.

Description

technical field [0001] The invention belongs to the technical field of industrial waste treatment, and in particular relates to a method for extracting lead from sintering smoke. Background technique [0002] Sintering dust is the industrial waste collected by the dust collection system during the sintering process of iron ore raw materials in iron and steel enterprises. Its main components are: K 2 O 20~35%, Na 2 O 5-8%, Cl 25-35%, Pb 4-10%, Cu 0.8-1.5%, Fe 10-15%, CaO 5-8%, Al 2 o 3 0.1~1.0%, MgO 0.5~1.2%, SiO 2 3-5%, Ag 200-400g / t. It can be seen from its main components that sintering fume contains a variety of valuable elements, which can be used as secondary resources for comprehensive recycling. [0003] Sintering dust is the waste slag produced during the sintering process of iron ore raw materials in iron and steel enterprises. The current treatment process is mainly to return to the blast furnace and use it as raw material blending. Due to the particularity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B13/00C22B26/10
CPCC22B7/006C22B7/02C22B13/045C22B26/10Y02P10/20
Inventor 易德华潘军苏毅郑仁和
Owner 攀枝花火凤凰再生资源回收利用有限责任公司
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