Anode for electrowinning and electrowinning method using same

An electrolytic extraction and anode technology, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of hindering the reaction, increasing the electrolytic voltage, and increasing the electrolytic voltage, so as to improve the catalytic activity, reduce the electrolytic voltage, and reduce the electrolytic voltage. Effect

Active Publication Date: 2013-12-25
DOSHISHA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reactions occur on the anode at the same time as the generation of oxygen in the anode reaction of the sulfuric acid-based electrolyte. The catalytic activity of the manganese compound and lead dioxide for the generation of oxygen is low, and the conductivity is not high, so the oxygen on the anode is hindered. As a result, the potential of the anode rises and the electrolysis voltage increases
In addition, for example, when cobalt ions are added to the electrolytic solution as an additive component of the electrolytic solution instead of metal ions to be electrolytically extracted, oxygen generation occurs on the anode, and at the same time, +2-valent cobalt ions are generated as a side reaction. Oxidation of the resulting cobalt oxyhydroxide (CoOOH) precipitates on the anode, which causes an increase in the electrolysis voltage, similar to the precipitation of the above-mentioned manganese compound and lead dioxide on the anode
Precipitation and accumulation of metal oxides and / or metal oxyhydroxides caused by the above-mentioned side reactions on the anode lead to an increase in the electrolysis voltage and at the same time cause a decrease in the life and durability of the anode

Method used

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  • Anode for electrowinning and electrowinning method using same
  • Anode for electrowinning and electrowinning method using same
  • Anode for electrowinning and electrowinning method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A commercially available titanium plate (5 cm in length, 1 cm in width, and 1 mm in thickness) was immersed in a 10% oxalic acid solution at 90° C. for 60 minutes for etching treatment, washed with water, and dried. Then, to butanol containing 6vol% concentrated hydrochloric acid (n-C 4 h 9 OH) solution was added ruthenium trichloride trihydrate (RuCl 3 ·3H 2 O) and tantalum pentachloride (TaCl 5 ), the molar ratio of ruthenium and tantalum is 30:70, and the sum of ruthenium and tantalum is 50 g / L in terms of metal, thereby making a coating liquid. This coating solution was applied on the dried titanium plate, dried at 120° C. for 10 minutes, and then thermally decomposed in an electric furnace kept at 260° C. for 20 minutes. This coating, drying, and thermal decomposition were repeated five times in total to form a catalyst layer on a titanium plate as a conductive substrate, thereby producing the anode for electrolytic extraction of Example 1.

[0086] The electr...

Embodiment 2

[0089] The anode for electrowinning in Example 2 was produced by the same method as in Example 1, except that the thermal decomposition temperature at the time of forming the catalyst layer was changed from 260°C to 280°C. The electrolytic extraction anode of embodiment 2 is carried out structural analysis by X-ray diffraction method, and the result is: as figure 1 shown, not seen with RuO 2 Comparable diffraction peaks are also not seen with Ta 2 o 5comparable diffraction peaks. In addition, although the diffraction peak of Ti can be seen, it is caused by the titanium plate. That is, in the anode for electrowinning in Example 2, a catalyst layer containing amorphous ruthenium oxide and amorphous tantalum oxide was formed on the titanium plate.

[0090] Preparation of 0.80mol / L ZnSO 4 and 2.0 mol / L sulfuric acid, and a zinc plate (2 cm x 2 cm) was immersed in the electrolyte as a cathode. In addition, the anode for electrolytic extraction of the above-mentioned Example 2...

Embodiment 3

[0112] The electrolytic solution of embodiment 1 becomes by the CuSO of 0.60mol / L 4 And the electrolytic solution that the sulfuric acid of 0.90mol / L constitutes, other conditions are identical with embodiment 1, carry out the electrolytic extraction of copper, measure the terminal voltage (electrolytic voltage) between the anode-cathode of electrolytic extraction simultaneously.

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Abstract

Provided is an anode for electrowinning such that, in electrowinning using a sulfuric acid-based electrolyte solution, the electric potential for oxygen generation is lower than for a lead electrode, lead alloy electrode, and coated titanium electrode, the electrolysis voltage for electrowinning can be reduced, and the basic units for electric energy can be reduced for a desired metal. This anode can be used as the anode for electrowinning of various types of metal and has superior mass productability. The anode for electrowinning is used in the electrowinning that uses a sulfuric acid-based electrolyte solution, and a catalyst layer that includes noncrystalline ruthenium oxide and noncrystalline tantalum oxide is formed on a conductive base substance.

Description

technical field [0001] The present invention relates to an anode for electrowinning used in electrowinning for extracting a desired metal by electrolysis and an electrowinning method using the anode, and more particularly to an anode for electrowinning used for electrowinning in which oxygen is generated by an anode reaction using a sulfuric acid-based electrolyte and an electrolytic extraction method using the anode. Background technique [0002] Electrowinning of metals is carried out by immersing the anode and cathode in an aqueous solution (hereinafter, referred to as electrolyte solution) containing ions of the metal to be extracted, and then applying electricity to deposit the metal on the cathode. As a representative example of electrolytic extraction, the following method can be mentioned: using a process that contains copper, zinc, nickel, cobalt, lead, platinum group metals (platinum, iridium, ruthenium, palladium, etc.), noble metals (silver, gold), Other transit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02
CPCC25C7/02C25C1/08C25C1/12C25C1/16
Inventor 盛满正嗣
Owner DOSHISHA CO LTD
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