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Method for producing high-purity silver from high-quality silver

A high-purity, electrolytic silver powder technology, applied in electrolytic components, electrolytic processes, etc., can solve the problems of unsatisfactory copper and lead removal effects, and achieve the effects of small production site, simple production operation control, and stable quality

Active Publication Date: 2018-11-20
ZHEJIANG PROVINCE SUICHANG GOLD MINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intermediate frequency electric furnace is flexible for smelting and is suitable for processing materials with a small amount, but the effect of removing copper and lead is not ideal

Method used

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  • Method for producing high-purity silver from high-quality silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a. Cast silver anode plate once. Using the high-quality silver produced by smelting pickling gold mud in an intermediate frequency electric furnace as raw material, six furnaces of primary silver anode plates were cast, with a total weight of 668.4kg, an average gold content of 6.14%, an average silver content of 76.64%, an average lead content of 17.72%, and an average content of Copper 0.26%;

[0024] b. Primary silver electrolysis. Silver electrolysis is 4 tanks connected in series, each tank has 3 rows of cathodes and 4 rows of anodes, and the anodes are covered with cloth bags. Put 6 furnaces of 668.4kg primary silver anode plates into primary silver electrolysis with a current density of 477.5A / m 2 , The tank pressure is 1.7V, the liquid temperature is 39°C, and the main components of the initial electrolyte are silver 106.25g / L, copper 6.94g / L, lead 3.25g / L, and nitric acid 59.48g / L. The silver anode plate is about 200kg in the primary electrolysis, and t...

Embodiment 2

[0029] a. Cast silver anode plate once. Using the high-quality silver produced by smelting pickling gold mud in an intermediate frequency electric furnace as raw material, 8 furnaces of primary silver anode plates were cast, with a total weight of 894.8kg, an average gold content of 5.88%, an average silver content of 77.14%, an average lead content of 16.44%, and an average content of Copper 0.24%;

[0030] b. Primary silver electrolysis. Silver electrolysis is 4 tanks connected in series, each tank has 3 rows of cathodes and 4 rows of anodes, and the anodes are covered with cloth bags. Put 8 furnaces of 894.8kg primary silver anode plates into primary silver electrolysis, the current density is 477.5A / m2, the tank pressure is 1.7V, and the liquid temperature is 40°C. The main components of the initial electrolyte are silver 118.35g / L, copper 7.94g / L, lead 3.18g / L, nitric acid 61.31g / L. Electrolyze about 200kg of silver anode plate once, the lead content of the primary...

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Abstract

Provided is a method for producing high-purity silver through alloyed silver. The method includes five primary steps of primary silver anode plate casting, primary silver electrolysis, secondary silver anode plate casting, secondary silver electrolysis and silver waste liquid treatment, wherein by adoption of secondary silver electrolysis, silver with high purity of 99.997% can be produced from alloyed silver with silver content of 70% or above through electrolysis. The method includes the five primary steps of primary silver anode plate casting, primary silver electrolysis, secondary silver anode plate casting, secondary silver electrolysis and silver waste liquid treatment, achieves a breakthrough in treating high-lead alloyed silver, electrolytic silver with purity of 99.997% is obtained through secondary electrolysis, defects of other refining and purification modes are overcome, and the purposes of stable product quality, high purity of silver, low loss rate, high raw material adaptability and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of precious metal metallurgy, in particular to a method for producing high-purity silver from high-quality silver. Background technique [0002] Silver has the best electrical conductivity, good thermal conductivity and ductility, and also has certain oxidation resistance. The key is that it is cheaper than gold, so it has a wide range of uses in industry, mainly divided into three aspects: silver powder and its Electronic paste, silver wire and solder, silver contacts, etc. These uses require high-purity silver. In recent years, with the development of the LED industry and the photovoltaic industry, the demand for high-purity silver has grown rapidly. [0003] At present, the domestic production of 99.99% silver is basically by electrolysis, but the requirements for silver anode plates are higher, the content of gold and silver should be >98%, the content of lead should be <5%, and the acidity contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02C25C7/06
CPCC25C5/02C25C7/06
Inventor 叶跃威傅国民
Owner ZHEJIANG PROVINCE SUICHANG GOLD MINE