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Alloy gold direct production method of high-purity gold

A technology of alloyed gold and pure gold, which is applied in the field of direct production of high-purity gold from alloyed gold, can solve the problems of reducing gold backlog and shortening the production cycle, and achieves the effects of small production space, low gold loss rate and stable quality.

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

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Problems solved by technology

[0003] The present invention aims to solve the above-mentioned problems in the prior art, and provides a method for direct production of high-purity gold from alloyed gold, so as to overcome the respective shortcomings of multiple electrolytic refining or extraction and purification, shorten the production cycle, relatively reduce gold backlog or reduce gold production. The loss rate, solve the problem of raw material adaptability and so on

Method used

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  • Alloy gold direct production method of high-purity gold

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Effect test

Embodiment 1

[0022] a. Cast gold anode plate. Using the alloyed gold treated with anode slime produced by silver electrolysis as raw material, 4 furnaces of gold anode plates were cast, with a total weight of 119.93kg, containing 96.64% gold, 3.01% silver, and 0.1% lead;

[0023] b. Make liquid. 74 bottles of analytically pure hydrochloric acid, 500ml / bottle, half-wave rectified cathode current density 1760A / m 2 , Tank pressure 2.7V, liquid temperature 67°C, 2 tanks connected in series, 3 rows of anodes and 2 rows of cathodes in each tank, gold anode plates as anodes, pure gold sheets as cathodes, liquid production time 44 hours, liquid specific gravity at the end of 1.42, cooling After filtering, 51.6 liters of gold electrolyte solution was obtained, and 20.5 kg of gold anode plate was dissolved by solution making;

[0024] c. Gold electrolysis. Put the remaining 99.43kg gold anode plate into the electrolysis. Gold electrolysis tanks are connected in series, with 4 rows of anodes and 3...

Embodiment 2

[0027] a. Cast gold anode plate. Using the alloyed gold treated with anode slime produced by silver electrolysis as raw material, 5 furnaces of gold anode plates were cast, with a total weight of 148.82kg, containing 97.68% gold, 1.88% silver, and 0.12% lead;

[0028] b. Make liquid. The gold electrolyte is left over from the last electrolysis. The specific gravity of the electrolyte is 1.39, and the lead content is 0.48g / L. It can still be used without making liquid;

[0029] c. Gold electrolysis. Put 148.82kg gold anode plate into electrolysis, gold electrolysis 2 tanks connected in series, 4 rows of anodes and 3 rows of cathodes in each tank, silver rods for conductive rods, gold hooks for anode plate hooks, pure gold sheets for cathodes, positive current density of cathodes 265A / m 2 , cell voltage 0.19V, cathode reverse current density 75A / m 2 , the electrolyte temperature is 44°C, and the anode plate should be replaced in time when the electrolysis process is small. ...

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Abstract

A method for directly producing high-purity gold from rough gold includes the four main steps of casting of a gold anode plate, solution making, electrolysis and waste liquid treatment. The 99.999% high-purity gold is produced directly from the rough gold containing 96% of gold or above through an electrolysis method. The method includes the four main steps of casting of the gold anode plate, solution making, electrolysis and waste liquid treatment, a traditional electrolysis fine method is broken through, the 99.999% gold is obtained through one-time electrolysis, the defects of other refining purification methods are overcome, and the purposes of stable product quality, high gold purity, 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 directly producing high-purity gold from alloy gold. Background technique [0002] At present, with the transfer of the world's semiconductor industry to China, in recent years, the demand for 99.999% high-purity gold has grown at a rate of 20% to 80% per year. At present, there are still very few domestic manufacturers producing high-purity gold, while most domestic and foreign High-purity gold basically adopts multiple electrolytic refining or extraction methods. Multiple gold electrolytic refining needs to prepare electrolytes of different qualities, and casting secondary gold anode plates requires 99.9% or 99.99% gold material, which doubles the gold loss rate and production cost; similarly, the extraction method Refining, the recovery of the gold contained in the water phase is reduced by chemical reagents, such reductions are incomplete and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/20C25B1/26C22B7/00C22B11/00
CPCC22B7/006C22B11/042C25B1/26C25C1/20Y02P10/20
Inventor 傅国民叶跃威
Owner ZHEJIANG PROVINCE SUICHANG GOLD MINE