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A method for industrial copper electro-refining

A copper electrolytic refining, electrolytic refining technology, applied in the field of copper electrolytic refining, can solve the problems affecting the quality of copper

Active Publication Date: 2014-10-22
新科学投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be added, however, that in industrial cells the current density at the individual cathodes is significantly different, which will affect the quality of the copper obtained

Method used

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  • A method for industrial copper electro-refining
  • A method for industrial copper electro-refining
  • A method for industrial copper electro-refining

Examples

Experimental program
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Effect test

Embodiment 1

[0071] A pair of electrodes is provided in an electrochemical cell made of polyvinyl chloride. The cathode is made of stainless steel plate with a thickness of 0.1 mm and a surface area of ​​2 cm 2 . The anode (reference electrode) is made of a 0.25 mm thick copper plate with a surface area of ​​100 cm 2 . The process is carried out at room temperature (approximately 20°C). The cell is filled with electrolyte having the following composition: 46 g / dm 3 Cu, 180g / dm 3 h 2 SO 4 and 0.1g / dm 3 Fe, 0.3g / dm 3 Sb, 0.03g / dm 3 Bi, 5g / dm 3 Ni, 10g / dm 3 As, 0.00015g / dm 3 Ag, 0.001g / dm 3 Ba, 0.4g / dm 3 Ca, 0.001g / dm 3 Cd, 0.03g / dm 3 Co, 0.02g / dm 3 Mg, 0.0004g / dm 3 Mn, 0.007g / dm 3 Pb and 0.001g / dm 3 Pd. The electrolyte composition is similar to conventional industrial electrorefining electrolytes such as those used in the prior art copper electrorefining process in the KGHM PM copper smelter (discussed earlier). However, no organic additives are included in this electro...

Embodiment 2

[0079] In this second example, the experimental setup and electrolysis conditions were similar to those in Example 1, except that a different cathode potential was used to result in a higher current.

[0080] Parameters for potentiostatic electrolysis:

[0081] The stainless steel cathode potential E=-0.450V relative to the copper anode;

[0082] Electrolysis time t=1 hour;

[0083] After about 25 seconds of applying a constant potential of -0.450V to the electrodes, the cathode reaches about 500A / m 2 stable current density.

[0084] After copper deposition on stainless steel cathodes, the cathodic deposits were mechanically removed from the cathodes, rinsed with water, air-dried, and the composition of the resulting copper was investigated using the EDS / EDX method. As in Example 1, the resulting cathode deposit was also found to have a fine-grained structure, free of dendrites. Oxygen accounts for approximately 0.05% by weight and is the only / only impurity present in the ...

Embodiment 3

[0086] The test setup and electrolysis conditions were similar to those in Example 2, except that the process was carried out at a higher temperature of 60°C.

[0087] Parameters for potentiostatic electrolysis:

[0088] The stainless steel cathode potential E=-0.450V relative to the copper anode;

[0089] Electrolysis time t=1 hour;

[0090] After about 25 seconds of applying a constant potential of -0.450V to the electrodes, the cathode reaches about 1400A / m 2 stable current density.

[0091] After copper deposition on steel cathodes, the cathodic deposits were mechanically removed from the cathodes, rinsed with water, air-dried, and the composition of the resulting copper was investigated using the EDS / EDX method. The resulting cathode deposit was found to have a fine-grained structure, free of dendrites. Oxygen accounts for approximately 0.05% by weight and is the only / only impurity in the resulting copper cathode. The resulting copper cathode thus has a purity higher...

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Abstract

A method of copper electrorefining is disclosed. The method includes arranging at least one anode of copper material to be refined in contact with an electrolyte solution and arranging at least one cathode in contact with the electrolyte solution. The anode and cathode are connected electrically to an electrical source, and the source is operated under potential controlled conditions. The electrical potential at the cathode is -0.30 V to -0.55 V with respect to the copper material at the anode, thereby causing the deposition of electrorefined copper at the cathode. The method also includes potentiostatic pulse electrolysis (PPE) and periodic potential reversal (PPR) in order to produce a copper deposit having a controllable structure, for example in terms of roughness or porosity. An apparatus for performing potential controlled electrolysis is also disclosed.

Description

technical field [0001] The present invention relates to a new method of electrolytic refining of copper using potential control, which has application in the copper industry. Background technique [0002] According to the statistical data disclosed in the patent application No PL396693, the global annual production of electrolytic copper obtained by copper electrolytic refining method reached 15 million tons in 2009. Furthermore, from the data published by W.G.Davenport, M.King and M.Schlesinger in a monograph entitled "Extractive Metallurgy of Copper" published in Elsevier Science Ltd. Oxford in 2002, it is known that high copper content can be obtained by electrolytic refining. Made of 99.90% high-purity copper. [0003] Both the quality of copper and the market price of copper depend on its mechanical, electrical and thermal properties, which vary with the content of impurities. Electrorefining removes impurities from copper that cannot be removed by alternative pyro-re...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C7/06
CPCC25C1/12C25C7/06C25C7/00
Inventor 米哈尔·吉尔罗恩普热梅斯瓦夫·扎普扎尔斯基斯瓦沃米尔·鲁塔
Owner 新科学投资有限公司
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