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Auxiliary reagent suitable for rapid electrorefining of high-silver alloyed gold

A technology of electrolytic refining and high-quality gold, which is applied in the direction of photography auxiliary technology, photography technology, instruments, etc., can solve the problems of environmental pollution, low production efficiency, long electrolysis cycle, etc., achieve significant environmental benefits, reduce consumption, and reduce environmental pollution Effect

Active Publication Date: 2014-08-27
陕西黄金集团西安秦金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, no matter which technology is adopted at present, in the process of refining gold by electrolysis, the silver content in the anode gold is usually controlled within 5% (m / m). If the silver content is too high, the electrolysis cycle will be too long and the production efficiency will be low.
In addition, in order to improve the electrolysis efficiency, high acidity conditions are usually selected for electrolysis, and the concentration of hydrochloric acid in the electrolyte is usually 4-6mol L -1 , due to the high acidity of the electrolyte, it has strong volatility in the electrolysis process, and there are problems such as environmental pollution and poor working environment

Method used

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  • Auxiliary reagent suitable for rapid electrorefining of high-silver alloyed gold
  • Auxiliary reagent suitable for rapid electrorefining of high-silver alloyed gold
  • Auxiliary reagent suitable for rapid electrorefining of high-silver alloyed gold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: Containing about 5% silver (m / m) alloy gold electrolysis

[0011] Select high-quality gold, which contains Au 93.5%, Ag 4.8%, Cu 0.56%, Ni 0.92%, Fe 0.13%, Pb 0.02%, Zn, As, Sb, Cr, Mn, Sn, Mg and other 12 elements Are less than 0.005%, electrolysis.

[0012] The weight of wool is 32Kg, converted into a pure weight of 29.8Kg, and the concentration of gold ions in the prepared electrolyte is 90-120g L -1 , hydrochloric acid concentration 1.5-2mol L -1 , the composition of the electrolytic auxiliary reagent QJ-D-1 is 1.0% NNO+19% NH 4 Cl+80%KCl, the concentration of gold electrolysis auxiliary reagent QJ-D-1 in the electrolyte is 80g L -1 , electrolyte temperature 45-55 ℃, electrolysis time 36h.

[0013] The specific steps of electrolysis are as follows:

[0014] Step 1: Preparation of Chlorauric Acid Solution

[0015] Use 5000-6000g of gold powder with a purity greater than 99.95%, put it in a double-layer glass reactor, and use 6mol L in a closed neg...

Embodiment 2

[0036] Embodiment Two: Electrolysis of Alloy Gold Containing About 7% Silver (m / m)

[0037] Select high-quality gold, which contains Au 92.1%, Ag 7.2%, Cu 0.46%, and the content of 15 elements such as Ni, Fe, Pb, Zn, As, Sb, Cr, Mn, Sn, Mg, etc. is all less than 0.005%. electrolysis. The specific steps of electrolysis are the same as in Example 1.

[0038] The weight of the input wool is 31.7Kg, converted into a pure weight of 29.20Kg, and the concentration of gold ions in the electrolyte is 90-120g L -1, hydrochloric acid concentration 1.5-2mol L -1 , the composition of the electrolytic auxiliary reagent QJ-D-1 is 2.0% NNO+43% NH 4 Cl+55% KCl, the concentration of gold electrolysis auxiliary reagent QJ-D-1 in the electrolyte is 100g L -1 , electrolyte temperature 45-55 ℃, electrolysis time 38h.

[0039] The data obtained by electrolysis are as follows: 20.92Kg of pure gold meeting the requirements of the Au99.99% standard was obtained. The contents of various impurity el...

Embodiment 3

[0043] Embodiment Three: Containing about 10% silver (m / m) alloy gold electrolysis

[0044] Select high-quality gold, which contains Au 89.82%, Ag 9.58%, Cu0.36%, Ni 0.15%, Fe, Pb, Zn, As, Sb, Cr, Mn, Sn, Mg and other 14 elements are all less than 0.005 % for electrolysis. The specific steps of electrolysis are the same as in Example 1.

[0045] The weight of the input wool is 30.12Kg, converted into a pure weight of 27.04Kg, and the concentration of gold ions in the electrolyte is 90-120g L -1 , hydrochloric acid concentration 1.5-2mol L -1 , the composition of the electrolytic auxiliary reagent QJ-D-1 is 3.0% NNO+52% NH 4 Cl+45% KCl, the concentration of gold electrolysis auxiliary reagent QJ-D-1 in the electrolyte is 120g L -1 , Electrolyte temperature 45-55 ℃, electrolysis time 40h.

[0046] The data obtained by electrolysis are as follows: 18.51Kg of pure gold meeting the requirements of the Au99.95% standard was obtained. The content of each impurity element in the ...

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Abstract

The invention relates to the field of gold electrorefining purification, in particular to an auxiliary reagent suitable for rapid electrorefining of high-silver alloyed gold. The auxiliary reagent QJ-D-1 for gold electrolysis is a mixture composed of 15-80% of ammonium chloride, 15-80% of potassium chloride, and 0.5-5% of sodium methylene dinaphthalene disulfonate serving as a dispersing agent. According to the invention, the severe anodic passivation phenomenon in the electrolysis process of the high-silver alloyed gold is reduced, the electrolysis efficiency of the high-silver sample is improved, the concentration of hydrochloric acid in the electrolyte is reduced to lower than 2 mol / L, and the environmental pollution is reduced. Alloyed gold with Ag content of 5-10% is directly electrolyzed, the quality of the product obtained after one-time electrolysis meets the requirements of national 1# standard gold and 2# standard gold, the yield of cathode gold within 40 hours is approximate to 70%, the residual anode rate is less than 20%, and the metal balance recovery rate is 99.92%.

Description

technical field [0001] The invention relates to the field of electrolytic refining and purification of gold, in particular to an auxiliary reagent suitable for rapid electrolytic refining of high-silver alloy gold. Background technique [0002] There are many methods of gold purification, including fire oxidation refining, chlorination refining, electrolytic refining, chemical refining, solvent refining and so on. Among them, the electrolysis method has the advantages of simple process and stable product quality, but at the same time, it has the problems of long production process and serious gold backlog. In order to overcome the shortcomings of the traditional electrolysis method, a rapid electrolysis process has been developed in recent years, which has greatly improved the electrolysis efficiency of gold. However, the most harmful component in electrolytic anode gold is silver. The silver in the anode gold becomes a silver chloride shell and adheres to the anode plate, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/20
Inventor 李中玺李海涛倪迎瑞
Owner 陕西黄金集团西安秦金有限责任公司
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