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Gold wet purification process

A wet purification and process technology, applied in the field of gold wet purification process, can solve the problems of large environmental pollution, high loss of hydrochloric acid, high production cost, etc., and achieve the effect of complete reduction, high product purity and low production cost

Inactive Publication Date: 2008-12-24
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Abstract
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Problems solved by technology

Since the method is in a boiling state during the third leaching, in order to maintain a certain solid solution ratio, the hydrochloric acid solution of 1:1 is continuously added dropwise, the high-temperature acid mist will pollute the environment greatly, the loss of hydrochloric acid is large, and the production cost is high; And the reduction with oxalic acid is still a heating operation

Method used

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  • Gold wet purification process

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Embodiment Construction

[0025] The following is the reference attached figure 1 An embodiment of the invention is described by way of illustration, but it must be understood that this embodiment is not to be construed as a limitation of the invention.

[0026] The specific implementation process of the purification process of this specific embodiment is:

[0027] a. Put 41.9 grams of coarse gold powder in a 250 ml beaker, add 150 ml of aqua regia to submerge the coarse gold powder to partially dissolve the coarse gold powder, then heat to 80°C while stirring to dissolve the remaining coarse gold powder, cool and stand for 1 hour, and filter , to separate the filter residue;

[0028] b. Heat the filtrate to 80°C, slowly and continuously add hydrochloric acid to catch up with nitric acid, observe the color of the smoke on the liquid level of the filtrate while stirring, and stop adding hydrochloric acid when there is no brown smoke;

[0029] c. Mix and dilute the solution after catching up with nitri...

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Abstract

The invention relates to a process for purifying gold by the wet method. Firstly, aqua fortis is used to remove silver; secondly, nitric acid is used to remove impurities such as bismuth and copper, etc.; the separation is performed by filtering; in the richly contained gold solution, the gold is reduced to gold powder deposited by an oxalic acid reducing agent with strong reducibility, and the impurities such as platinum, the bismuth and the copper, which are reduced simultaneously, are redissolved by nitric acid added later and enter the solution, and the solution is subjected to the filtering separation to obtain pure gold powder; and the pure gold powder is made to be ingot-shaped by fushion casting, and the finished gold ingots with a gold content of 99.99 percent are obtained. In the invention, the reduction reaction is made by oxalic acid at a low temperature, so that the process of the invention has the advantages of not causing environmental pollution, favorability for the heath of operators, lowering cost, shortening the period and obvious economic and social benefits.

Description

technical field [0001] The invention relates to the purification of precious metals, in particular to a gold wet purification process. Background technique [0002] As a precious metal, gold is difficult to mine, high in mining cost, and has good physical properties. It is characterized by a high melting point of 1064.43 degrees Celsius. Gold is not easy to melt and has a high density of 19.31 grams per cubic centimeter (at 18°C). , good toughness and ductility, good conductivity. China's gold production jumped to a record high of 276 tonnes last year, up 12 percent from 2006, while South Africa produced 272 tonnes. From 2000 to 2007, the price of gold rose from about US$270 per ounce to over US$850. In 2008, it hit a record high of US$1033.9 per ounce, but the global gold mining volume fell by 6.7%. And it is imperative to increase the added value of gold. [0003] At present, the following methods are usually used to deal with gold and silver-containing materials: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
CPCY02P10/20
Inventor 张圣南陈朴
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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