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Method for removing zinc from zinc hydrometallurgy acidic leaching residue flotation silver concentrate

A technology of acid leaching and hydrometallurgy zinc, applied in the direction of improving process efficiency, can solve the problems of waste of resources and low recovery rate of zinc

Inactive Publication Date: 2011-04-13
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) The zinc recovery rate is low, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] A, the preparation of leaching solution, add water in the leaching tank, then start the mixer to stir and add sulfuric acid slowly, prepare sulfuric acid leaching solution, heat, and add acidic leaching residue;

[0020] B, oxidation, blowing compressed air into the leaching tank of step A, oxidizing the slag and liquid in the tank, and closing the compressed air machine after oxidizing and leaching for 18-20 hours;

[0021] C. Filtration: filter the oxidized liquid obtained in step B to obtain dezincification leaching slag and filtrate, send the filtrate to the zinc system to recover zinc, and send the dezincification leaching slag to the lead system to recover silver.

[0022] The heating method is electric heating or steam heating.

[0023] The initial acid concentration of the sulfuric acid leaching solution is 150-180 g / L.

[0024] The heating leaching temperature is at least 95°C.

[0025] The liquid-solid ratio of the sulfuric acid leaching solution to the acid...

Embodiment 1

[0033] In a volume of 100M 3 In the leaching tank, prepare 60M 3 Sulfuric acid solution containing 150g / L of sulfuric acid (weight 60 tons), heated by steam to 95°C, added 7.5 tons of flotation silver concentrate while stirring, opened compressed air (1# air pipe), leached for 18 hours and then filtered. The filter residue weighs 3 tons, the residue contains 18.06% zinc (wt%), the residue rate is 40%, and the zinc leaching rate is 80%.

Embodiment 2

[0035] In a volume of 100M 3 In the leaching tank, prepare 60M 3 Sulfuric acid solution containing 160g / L of sulfuric acid (weight 60 tons), heated by steam to 95°C, adding 6 tons of flotation silver concentrate while stirring, turning on compressed air (1# air pipe), leaching for 18 hours and then filtering. The filter residue weighs 2.4 tons, the residue contains 14.10% zinc (wt%), the residue rate is 40%, and the zinc leaching rate is 82.6%.

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PUM

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Abstract

The invention discloses a method for removing zinc from a zinc hydrometallurgy acidic leaching residue flotation silver concentrate, and aims to provide the method for removing the zinc from the zinc hydrometallurgy acidic leaching residue flotation silver concentrate. The method is characterized by comprising the following steps of: A, preparing leaching solution, namely adding water into a leaching tank, starting a stirrer to stir and slowly adding sulfuric acid to prepare sulfuric acid leaching solution, heating and adding acidic leaching residues; B, oxidizing, namely blowing compressed air into the leaching tank in the step A, oxidizing the residues and the solution in the tank, oxidizing and leaching for 18 to 20 hours and then stopping an air compressor; and C, filtering, namely filtering the oxidized solution obtained in the step B to obtain dezincified leaching residues and filtrate, conveying the filtrate to a zinc system to recover the zinc, and conveying the dezincified leaching residues to a lead system to recover silver. The method is mainly used for removing the zinc from the zinc hydrometallurgy acidic leaching residue flotation silver concentrate.

Description

technical field [0001] The invention relates to a method for dezincification from flotation silver concentrate, in particular to a method for dezincification from wet process zinc acid leaching slag flotation silver concentrate. Background technique [0002] Zinc concentrate contains about 0.015% silver (wt%). The process of flotation silver from acidic leaching slag of zinc hydrometallurgy has been used, and the silver concentrate obtained by flotation is sent to lead smelters to recover the silver. The flotation silver concentrate contains Zn (wt%): 38-48%, S (wt%): 23-28%, and the flotation silver concentrate contains high zinc, wherein zinc mainly exists in the form of ZnS. [0003] There are certain problems in sending the flotation silver concentrate directly to the lead smelter for treatment: [0004] (1) Zinc has an adverse effect on the normal operation of the lead blast furnace: most of the ZnS does not change during the smelting process and enters the slag or mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B19/00C22B11/00
CPCY02P10/20
Inventor 陈顺张伟朱北平彭建国王文录张德晶李向东付卓英李迪汉
Owner ZHUZHOU SMELTER GRP