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A method for directly preparing metallic lead from lead-containing materials by solid phase reaction

A technology of solid phase reaction and metal lead, applied in the field of hydrometallurgy, can solve the problems of limited raw material processing capacity, occupying more land resources, and long process flow, etc., and achieves low reagent cost, simple process flow, and large processing capacity. Effect

Active Publication Date: 2020-06-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the pyrometallurgical method, although the hydrometallurgical method has certain advantages in terms of environment and energy consumption, it also has the problem of long process flow. Some leaching reagents such as fluosilicic acid and citric acid are relatively expensive, and due to The solubility of lead in the solution is low, which leads to a large liquid-solid ratio in the leaching process, which limits the processing capacity of raw materials. At the same time, a large number of reactors and solution storage tanks are required, which takes up a lot of land resources.
In addition, the electrodeposition method also has the problem of high power consumption cost.

Method used

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  • A method for directly preparing metallic lead from lead-containing materials by solid phase reaction
  • A method for directly preparing metallic lead from lead-containing materials by solid phase reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Solid phase reaction: 1kg of lead paste (Pb 70.8%), the amount of zinc powder is 1.0 times the theoretical amount, the reaction equipment is a stirring mill, the weight ratio of ball to material is 2:1, and the ratio of water to material is 0.3:1 (m 3 / t), add sulfuric acid to control the reaction pH3.0, the reaction time is 0.2h, and the lead conversion rate reaches 98.8%.

[0041] Solid-liquid separation: Wash and filter the solid-phase reaction product to obtain metallic lead and zinc sulfate solutions.

[0042] Metal lead melting and casting: the melting and casting temperature is 600°C, the amount of coal is 2.5%, and the obtained crude lead contains 99.1% lead. Crystallization: crystallize the zinc sulfate solution to obtain the zinc sulfate product.

Embodiment 2

[0044] Solid phase reaction: 1kg of lead paste (Pb 70.8%), the amount of zinc particles is 1.0 times the theoretical amount, the reaction equipment is a ball mill, the weight ratio of ball to material is 12:1, and the ratio of water to material is 1:1 (m 3 / t), add sulfuric acid to control the reaction pH to 4.0, the reaction time is 1h, and the lead conversion rate reaches 97.8%.

[0045] Solid-liquid separation: Wash and filter the solid-phase reaction product to obtain metallic lead and zinc sulfate solutions.

[0046] Metal lead melting and casting: the melting and casting temperature is 600°C, the coal consumption is 2.5%, and the crude lead obtained contains 98.1% lead. Crystallization: crystallize the zinc sulfate solution to obtain the zinc sulfate product.

Embodiment 3

[0048] Solid phase reaction: 1kg of lead paste (Pb 70.8%), the amount of iron filings is 1.0 times the theoretical amount, the reaction equipment is a stirring mill, the weight ratio of ball to material is 10:1, and the ratio of water to material is 0.5:1 (m 3 / t), add sulfuric acid to control the reaction pH to 3.0, the reaction time is 1h, and the lead conversion rate reaches 97.6%.

[0049] Solid-liquid separation: wash and filter the solid-phase reaction product to obtain metallic lead and ferrous sulfate solution.

[0050] Metal lead melting and casting: the melting and casting temperature is 570°C, the amount of coal is 2%, and the obtained crude lead contains 98.9% lead. Crystallization: Crystallize the ferrous sulfate solution to obtain the ferrous sulfate product.

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Abstract

The invention provides a method for directly preparing metallic lead from lead-containing materials through solid-phase reaction, which includes: step 1, adding the lead-containing materials to be treated into a grinder, and adding metal substances and water into the grinder, the The activity of metal substances is greater than that of lead; using a grinder through mechanical force, the lead-containing material and the metal substance directly undergo a solid-state reaction to obtain a reaction product; step 2, wash and filter the reaction product to obtain metallic lead and metal substances The corresponding metal salt solution; step 3, melting and casting metallic lead to obtain crude lead; crystallizing the metal salt solution to obtain the metal salt corresponding to the metal substance. Compared with the existing fire and wet processes for treating lead-containing materials, the method for preparing metallic lead in the present invention has the characteristics of short flow, few procedures, large processing capacity, and low energy consumption cost. At the same time, the present invention can meet the requirements of clean production environmental requirements.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for directly preparing metallic lead from lead-containing materials through solid-phase reaction. Background technique [0002] At present, the utilization of secondary lead resources has been paid more and more attention. The technology of desulfurization conversion + pyro-reduction smelting has been applied to the recycling of waste lead-acid battery lead paste with high lead content, but the pyrometallurgical process of processing lead paste has high energy consumption costs, and will produce sulfur dioxide, volatile lead dust and other atmospheric gases. pollutants. In addition, various types of lead sulfate slag, lead chloride slag, and lead oxide slag are produced in the smelting process of non-ferrous metals. The quantity is huge, but due to the relatively low lead content (20-60%), they have not been effectively utilized yet. [0003] In view of the env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B13/00
CPCC22B7/00C22B13/00Y02P10/20C22B13/045C22B13/04C22B3/08C22B3/46C22B3/10C22B3/22C22B7/007
Inventor 王成彦张文娟邢鹏车键勇马保中陈永强
Owner UNIV OF SCI & TECH BEIJING
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