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Process for extracting lead from zinc-lead dust

A dust, zinc-lead technology, applied in the process of zinc-lead dust lead extraction, can solve the problems of difficult separation of zinc and lead, waste of lead resources, difficult leaching, etc.

Pending Publication Date: 2022-04-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem in the prior art that zinc-lead dust contains zinc sulfide phase, which is more difficult to leach than zinc oxide, and remains in the leaching slag, resulting in difficult separation of zinc and lead, thereby causing waste of lead resources in zinc-lead dust, the present invention provides a zinc The process of extracting lead from lead dust not only has better economic and environmental benefits, but also effectively realizes the separation of zinc and lead

Method used

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  • Process for extracting lead from zinc-lead dust

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Experimental program
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Effect test

Embodiment 1

[0041] A kind of technology that zinc-lead dust extracts lead, refer to figure 1 , including the following steps:

[0042] S1, dehydration oxidation, includes the following steps:

[0043] S11, carried out at 110°C in the low-temperature stage, with a vacuum degree of 0.08MPa, and directly raised to the high-temperature stage after 120 minutes of treatment;

[0044] S12, the high-temperature stage is carried out at 490°C, and oxygen is introduced to react for 20 minutes;

[0045] S2, ball milling activation, comprises the following steps:

[0046] S21, crush the dehydrated and oxidized dust in the crusher until the particle size is uniform, then use agate balls for high-strength grinding and activation in the planetary ball mill, the ratio of material to ball is 1:1, and the speed is 350r·min -1 , ball milled for 8 hours to obtain the first-grade dust with a particle size of less than 200 mesh and the second-grade dust with a particle size larger than 200 mesh;

[0047] S2...

Embodiment 2

[0057] A process for extracting lead from zinc-lead dust, comprising the following steps:

[0058] S1, dehydration oxidation, includes the following steps:

[0059] S11, the low temperature stage is carried out at 115°C, the vacuum degree is 0.075MPa, and the temperature is directly raised to the high temperature stage after 90 minutes of treatment;

[0060] S12, the high-temperature stage is carried out at 500 ° C, and carbon dioxide is introduced, and the reaction is carried out for 25 minutes;

[0061] S2, ball milling activation, comprises the following steps:

[0062] S21, crush the dehydrated and oxidized dust in a crusher until the particle size is uniform, then use agate balls in a planetary ball mill for high-strength grinding and activation, the ratio of material to ball is 1:2, and the speed is 450r min -1 , ball milling for 6h;

[0063] S22, mixing the secondary dust and the primary dust with a mass ratio of 1:5, and performing ball milling activation again;

...

Embodiment 3

[0073] A process for extracting lead from zinc-lead dust, comprising the following steps:

[0074] S1, dehydration oxidation, includes the following steps:

[0075] S11, the low temperature stage is carried out at 120°C, the vacuum degree is 0.065MPa, and the temperature is directly raised to the high temperature stage after 60 minutes of treatment;

[0076] S12, the high temperature stage is carried out at 510°C, carbon dioxide and oxygen are introduced, the gas volume ratio is 1:1, and the reaction is 30 minutes;

[0077] S2, ball milling activation, comprises the following steps:

[0078] S21, crush the dehydrated and oxidized dust in a crusher until the particle size is uniform, then use agate balls in a planetary ball mill for high-strength grinding and activation, the ratio of material to ball is 1:3, and the speed is 550r·min -1 , ball milling for 4h;

[0079] S22, mixing the secondary dust and the primary dust with a mass ratio of 1:4, and performing ball milling ac...

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Abstract

The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a process for extracting lead from zinc-lead dust, which comprises the following steps: S1, dehydrating and oxidizing the zinc-lead dust with the zinc-lead mass fraction ratio of 2: 1-3: 1 to obtain dehydrated dust with the water content of less than 2% and containing zinc oxide; s2, the dehydrated dust is subjected to ball milling activation, and activated dust is obtained; s3, the activated dust is subjected to leaching treatment, and lead-rich leaching residues and zinc-containing leaching liquid are obtained; and S4, the lead-rich leaching residues and a reducing agent are mixed and pressed into blocks, high-temperature reduction sublimation is carried out under the reducing atmosphere, and lead-rich smoke dust is obtained. According to the method, the lead-rich smoke dust is obtained through dehydration oxidation, activation, leaching treatment and high-temperature reduction sublimation, the recovery rate of lead can reach 90% or above, and the process can effectively enrich lead from the zinc-lead dust and achieve separation of zinc and lead elements.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a process for extracting lead from zinc-lead dust. Background technique [0002] Metallic lead is a commonly used heavy non-ferrous metal material, which is widely used in chemical industry, metallurgy, storage battery, printing, cable, paint, protective materials and other industrial fields. However, because lead is a toxic heavy metal, improper handling will cause great harm to the ecological environment and human health, so it is necessary to deal with lead-containing waste. Zinc-lead dust is a kind of lead-containing waste, with high content of zinc and lead elements, which is of great recycling value. In zinc-lead dust, lead exists in the form of lead oxide and lead sulfate; zinc exists in the form of zinc oxide and zinc sulfide, and the separation of zinc and lead is difficult. [0003] Among the current processing and utilization methods for this type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/02C22B1/00C22B5/10C22B5/12C22B5/18C22B13/02C22B13/00
CPCY02P10/20
Inventor 李小明贺芸王伟安缪德军白冲韦旭立邱国兴
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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