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Copper electrolysis tail liquid purification copper removal decontaminating process method

A process method and technology for copper electrolysis, applied in the field of copper electrolysis tail liquid purification, copper removal and impurity removal, and copper electrolysis tail liquid purification field, can solve problems such as low cost, achieve small investment, low control requirements, and improve cathode current efficiency Effect

Active Publication Date: 2017-05-31
SHENYANG RES INST OF NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many purification methods, there is no report on the one with better effect, simple operation and lower cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Table 1 and Table 2 show the main chemical composition analysis results of copper oxide ore and copper electrolyte used in the test.

[0022] Table 1. Analysis of main chemical components of copper oxide ore.

[0023] Raw ore Cu Fe SiO 2

[0024] Table 2. Analysis of main components of copper electrolysis tail liquid.

[0025] element Cu Fe h 2 SO 4

[0026] First add copper oxide ore to reduce acidity of copper electrolyte, the reaction conditions are as follows: copper oxide ore-200 mesh particles account for more than 85%, mechanical stirring at room temperature, reaction time 2h, control the pH value of the leaching end point to 1~1.5, use copper ore Calculated on medium copper oxide, the copper leaching rate is 95.32%; calculated on the basis of total copper, the copper leaching rate is 92.97%. The iron leaching rate is low, below 3%. After the reaction, solid-liquid separation was carried out to obtain Cu-containing 2+ 64g / L...

Embodiment 2

[0028] The copper oxide ore and copper electrolyte used in the test are the same as those in Example 1. At first, the copper oxide ore is added to carry out acid reduction treatment on the copper electrolyte. The reaction conditions are as follows: copper oxide ore-200 mesh particles account for more than 75%, room temperature Mechanical stirring, reaction time 1h, control the pH value of the leaching end point to 1~1.5, the copper leaching rate is 94.08% based on the copper oxide in the copper ore; the copper leaching rate is 91.15% based on the total copper. The iron leaching rate is low, below 3%. After the reaction, solid-liquid separation was carried out to obtain Cu-containing 2+ 58g / L copper sulfate solution, add pre-configured sodium sulfite solution with a concentration of 75g / L to it, control the pH value of the solution at 3.0, and the reaction temperature at 85°C, mechanically stir the reaction for 1.5h and then filter to obtain red sulfurous acid A mixture of cup...

Embodiment 3

[0030] The copper oxide ore and the copper electrolyte used in the test are the same as those in Example 1. At first, the copper oxide ore is added to carry out acid reduction treatment on the copper electrolyte. The reaction conditions are as follows: the copper oxide ore-200 mesh particles account for more than 90%, and the room temperature Mechanical stirring, reaction time 1.5h, control leaching end point pH value 1~1.5, based on copper oxide in copper ore, copper leaching rate is 96.42%; based on total copper, copper leaching rate is 93.41%. The iron leaching rate is lower than 3%. After the reaction, solid-liquid separation was carried out to obtain Cu-containing 2+ 69g / L copper sulfate solution, add pre-configured sodium sulfite solution with a concentration of 84g / L to it, control the pH value of the solution at 3.0, and the reaction temperature at 90°C, mechanically stir for 1 hour and then filter to obtain red sulfite A mixture of copper and copper sulfite precipita...

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Abstract

The invention relates to a copper electrolysis tail liquid purification copper removal decontaminating process method. The process method includes the following steps that (1) electrolysis tail liquid is extracted at regular intervals to be fed to a liquid purification system, copper oxide ore is used for reducing acid, and normal temperature mechanical agitation leaching is carried out; (2) a sodium sulfite solution is added into a cupric sulfate solution obtained after filtering, the PH value of the solution is controlled, mechanical agitation is carried out, a leaching agent is subject to conversion and copper deposition, and copper is deposited in the form of cuprous sulfite or copper sulfite mixture; and (3) liquid obtained after deposition is subject to ferric reduction to be fed to a tailing pond, a way is opened for iron and other impurities from an electrodeposition system. According to the process method, the technology of reducing copper sulfate to deposit the cuprous sulfite through the sodium sulfite is adopted, a way is opened for copper and other impurity elements from a bath solution, the cathode current efficiency is improved, redundant acid in the bath solution is neutralized through copper oxide ore, the resource using rate is higher, and the beneficial effects of being not high in control requirement of equipment and process conditions, small in investment, simple, practical and capable of being returned to be used in the form of the cuprous sulfite or the copper sulfite are achieved.

Description

technical field [0001] The invention relates to a method for purifying copper electrolysis tail liquid, in particular to a process method for purifying copper electrolysis tail liquid to remove copper and remove impurities by treating redundant copper and impurity ions in copper electrolysis tail liquid to improve cathode current efficiency. Copper hydrometallurgy technical field. Background technique [0002] Electrolyte purification is an essential and important process of copper electrolysis, which is directly related to the quality of cathode copper. As the electrolysis progresses, the composition of the electrolyte changes continuously. During electrolysis, the dissolution rate of the anode is higher than the precipitation rate of the cathode, and the accumulation of dissolved impurities in the anode gradually increases the concentration of copper and impurities, while the concentration of free acid decreases, which is not conducive to the electrolytic refining of copp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/06C25C1/12
CPCC25C1/12C25C7/06Y02P10/20
Inventor 李辉舒方霞杨超丛自范
Owner SHENYANG RES INST OF NONFERROUS METALS
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