Purifying and impurity-removing method for copper electrolytic solution

A copper electrolyte, purification and impurity removal technology, which is applied in the direction of photography technology, equipment, photography auxiliary technology, etc., can solve the problems of poor purification effect, achieve good purification effect, reduce the amount of net copper per ton, and reduce emissions Effect

Inactive Publication Date: 2008-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Recently, some people also add high-arsenic solution or arsenic salt to the copper electrolyte, so that the Sb and Bi in the electrolyte and As form a precipitate and enter the anode slime. Miscellaneous effect, with the extension of use time, the purification effect is getting worse and worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mineral anode copper electrolytic refining: electrolyte circulation, continuous addition of hydrogen peroxide according to 2.2 times the stoichiometric amount, so that the concentration ratio of As(III) / As(V) in the electrolyte is less than 0.05, and an appropriate amount of additives (bone glue, thiourea, etc.) ), control the electrolyte temperature to 65±2°C, and set the current density to 265A / m 2 , the net liquid volume of copper per ton is less than 0.1m 3 , after one cycle of copper electrolytic refining, the test results of electrolyte and anode slime are as follows:

[0020] Cu

[0021] Electrolyte, g / L

Embodiment 2

[0023] Mineral anode copper electrolytic refining: electrolyte circulation, adding arsenic-containing solution to increase the concentration of As in the electrolyte from 3.5g / L to 9.1g / L, and continuously adding peroxysulfuric acid at 1.5 times the stoichiometric amount to make the electrolyte The concentration ratio of As(III) / As(V) is less than 0.12, the type and amount of additives are the same as in Example 1, the temperature of the electrolyte is controlled at 65±2°C, and the current density is set at 285A / m 2 , the net liquid volume of copper per ton is less than 0.1m 3 , the test results of electrolyte and anode slime after two cycles of copper electrolytic refining are as follows:

[0024] Cu

Embodiment 3

[0026] Add high-antimony matte in the converter blowing process, so that the relative mass ratio of Sb / Bi in the anode copper is increased from 0.433 to 1.81 for electrolytic refining: the electrolyte is circulated, and chloric acid is continuously added according to 1.2 times the stoichiometric amount, so that the As in the electrolyte ( The concentration ratio of III) / As(V) is less than 0.09, and an appropriate amount of additives (bone glue, thiourea, etc.) are added to control the electrolyte temperature to 65±2°C and set the current density to 255A / m 2 , the net liquid volume of copper per ton is less than 0.1m 3 After 10 days of copper electrolytic refining, the test results of electrolyte and anode slime are as follows:

[0027] Cu

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PUM

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Abstract

The invention relates to a copper electrolyte purification and impurity removal method, wherein, the speed of arsenic antimonates being separated out from copper electrolytes is accelerated by control of the relative mass ratio of antimony / bismuth in anode coppers to be 0.8 to 8.0 percent, the concentration of arsenic in the copper electrolytes to be 4.0 grams per liter to 15 grams per liter, and the concentration ratio of arsenic (III) / arsenic (V) to be 0.01 to 0.15, and then the self purification and impurity removal capacity of the copper electrolytes is further improved; the volume of the electrolytes which are purified by adoption of the prior art for production of a ton of cathode coppers during the electrorefining process of the coppers is driven to be below 0.1m<3>; the impurity concentration in the electrolytes is maintained to be 50 to 250 milligrams per liter for antimony and 60 to 300 milligrams per liter for bismuth. The copper electrolyte purification and impurity removal method has the advantages of simple technology, simple and convenient operation, small reagent dosage, good purification effect, low production cost, no side effect on the main technology and so on.

Description

technical field [0001] The invention relates to a copper electrolyte purification and impurity removal method. Background technique [0002] The arsenic, antimony and bismuth impurities in the anode copper are electrochemically dissolved together with the anode copper into the electrolyte during the electrolytic refining process. Since the precipitation potential of these impurities is close to that of copper, when the concentration of arsenic, antimony, and bismuth in the electrolyte accumulates to a certain level, they will be precipitated at the cathode, affecting the quality of cathode copper. Therefore, the copper electrolytic refining process must continuously purify the electrolyte. The traditional process of copper electrolyte purification is: extracting part of the electrolyte from the electrolyte circulation system; evaporation and crystallization to obtain copper sulfate; electrowinning of the crystallization mother liquor to remove copper and remove impurities t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12
CPCY02P10/20
Inventor 王学文陈启元肖连生尹周澜张启修张平民
Owner CENT SOUTH UNIV
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