A method for recovering lead and silver from lead sulfate slag

A technology of lead sulfate and metallic lead, which is applied in the field of lead and silver recovery, can solve the problems of low crystal quality, narrow use of lead chloride, and harsh operating conditions, and achieve the effects of fast replacement rate, easy operation, and high activity

Active Publication Date: 2020-07-03
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this type of method, lead chloride is produced after chlorination leaching, the lead crystallization rate is low, the crystal quality is not high, and the use of lead chloride is narrow; Silver, the operating conditions are more stringent

Method used

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  • A method for recovering lead and silver from lead sulfate slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Leaching: 1kg zinc leaching residue (Pb 17.5%, Ag 700g / t), leaching agent is 350g / L aluminum chloride solution, leaching temperature is 90°C, leaching time is 2h, pH of the leaching process is 0.5, liquid-solid ratio is 7.1:1. Lead leaching rate reaches 93%, silver leaching rate reaches 94%.

[0026] Silver replacement: use lead plate as the replacement agent, the replacement temperature is 30°C, the amount of metal lead is 1 times the theoretical amount, and the replacement is 4 hours to obtain 0.68g of coarse silver powder with a silver content of 91.3%.

[0027] Replacement of lead: use aluminum plate as the replacement agent, the replacement temperature is 30°C, the amount of aluminum plate is 1 times the theoretical amount, and the replacement is 1 hour to obtain a total of 164g of fine lead sludge with a lead content of 97.5%.

[0028] Aluminum ammonium sulfate crystallization: at room temperature at 25°C, add 500g / L (NH 4 ) 2 SO 4 Solution, form ammonium alumi...

Embodiment 2

[0031] Leaching: 1kg zinc leaching residue (Pb 32.6%, Ag 750g / t), leaching agent is 350g / L aluminum chloride solution, leaching temperature is 90°C, leaching time is 2h, pH of the leaching process is 1.0, liquid-solid ratio is 16.3:1. Lead leaching rate reaches 93.5%, silver leaching rate reaches 93%.

[0032] Silver replacement: use lead plate as the replacement agent, the replacement temperature is 30°C, the amount of metal lead is 1 times the theoretical amount, and the replacement is 4 hours to obtain 0.76g of coarse silver powder with a silver content of 90.1%.

[0033] Replacement of lead: use aluminum plate as the replacement agent, the replacement temperature is 30°C, the amount of aluminum plate is 1 times the theoretical amount, and the replacement is 1h to obtain a total of 304g of fine lead sludge with a lead content of 98.2%.

[0034] Aluminum ammonium sulfate crystallization: at room temperature at 25°C, add 500g / L (NH 4 ) 2 SO 4 Solution, form ammonium alumin...

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Abstract

The invention provides a method for recovering lead and silver from lead sulfate slag, and belongs to the technical field of hydrometallurgy. The method comprises the following steps of adding lead slag into an aluminum chloride solution, and performing lixiviating, so that the lead and the silver in the lead slag enter the solution; replacing the silver with metal lead from lixivium; then replacing the lead with metal aluminium from the lixivium after silver replacement; and returning the lixivium after lead replacement, and continuing lixiviating the lead slag. The technology of the method disclosed by the invention has the characteristics of being short in procedure, few in working process, low in energy consumption, low in cost and the like, and the environmentally-friendly requirements for clean production are met.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for recovering lead and silver from lead sulfate slag. Background technique [0002] In the process of lead-zinc metallurgy such as high-acid leaching of zinc calcine and leaching of lead blast furnace dust, lead and silver associated with zinc are enriched in the leaching slag, and the contents of Pb and Ag in such slag are usually 10-50% respectively , 100~800g / t. Due to technical and other reasons, this type of lead sulfate slag is less developed and utilized at present. [0003] The above-mentioned lead slag is processed by the method of flotation, and the recovery rate of lead and silver is low. The method of pyrometallurgy has high energy consumption, and at the same time, new lead-containing slag and smoke are generated during the treatment process, which increases the pressure on environmental protection. Pyrometallurgical technology is more suitable fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B13/00C22B11/00
CPCC22B7/006C22B7/04C22B11/044C22B13/045Y02P10/20
Inventor 王成彦陈永强邢鹏马保中
Owner UNIV OF SCI & TECH BEIJING
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