A kind of gold-silver alloy separation and purification process

Abstract

The invention relates to a gold-silver alloy separation and purification technique, belonging to the technical field of metallurgy. The technique comprises the following steps: 1) remelting the alloy; 2) quenching with water; 3) dissolving silver and impure metals with nitric acid; 4) depositing silver; 5) purifying the silver; and 6) purifying the gold. The base metals are introduced to change the composition of the gold-silver alloy, thereby solving the problem of mutual wrapping in the alloy dissolution process.

Description

technical field

[0001] The invention relates to a process for separating and purifying gold-silver alloys, belonging to the technical field of metallurgy. Background technique

[0002] Gold-silver alloys generally use nitric acid to leach silver, leach slag and then use aqua regia to leach gold, or directly use aqua regia to dissolve gold, and aqua regia insoluble slag to extract silver, but when the proportion of silver in gold-silver alloy is 8%-35%, gold When the ratio is 92%-65%, when the silver is leached with nitric acid, the silver is wrapped by gold, and the leaching rate of silver leached by nitric acid is very small; while the gold is leached directly with aqua regia, a large amount of silver chloride will be formed to wrap the gold, resulting in gold The leaching reaction is difficult. Contents of the invention

[0003] The present invention proposes a process for separating and purifying gold-silver alloys. The first is to solve the difficult problem of dissol...

Examples

Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation, but it does not limit the present invention.

[0021] figure 1 It is a process for separating and purifying gold and silver alloys, the main content of which is to separate and purify gold and silver alloys containing 8%-35% silver and 92%-65% gold; including the following steps:

[0022] 1) Remelted alloy

[0023] Put the above-mentioned gold-silver alloy in a graphite crucible, add metal zinc, or metal aluminum, or metal tin, or a mixture of several of them; add the amount to reduce the gold content in the alloy to below 30%; heat up to melt the alloy; At the same time, in order to prevent metal oxidation at high temperature, the entire melting process needs to be protected by an inert gas, such as nitrogen or argon;

[0024] 2) Water quenching

[0025] Slowly pour the remelted alloy into cold water to quench the molten alloy into fine al...

technical field

[0001] The invention relates to a process for separating and purifying gold-silver alloys, belonging to the technical field of metallurgy. Background technique

[0002] Gold-silver alloys generally use nitric acid to leach silver, leach slag and then use aqua regia to leach gold, or directly use aqua regia to dissolve gold, and aqua regia insoluble slag to extract silver, but when the proportion of silver in gold-silver alloy is 8%-35%, gold When the ratio is 92%-65%, when the silver is leached with nitric acid, the silver is wrapped by gold, and the leaching rate of silver leached by nitric acid is very small; while the gold is leached directly with aqua regia, a large amount of silver chloride will be formed to wrap the gold, resulting in gold The leaching reaction is difficult. Contents of the invention

[0003] The present invention proposes a process for separating and purifying gold-silver alloys. The first is to solve the difficult problem of dissol...

Examples

Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation, but it does not limit the present invention.

[0021] figure 1 It is a process for separating and purifying gold and silver alloys, the main content of which is to separate and purify gold and silver alloys containing 8%-35% silver and 92%-65% gold; including the following steps:

[0022] 1) Remelted alloy

[0023] Put the above-mentioned gold-silver alloy in a graphite crucible, add metal zinc, or metal aluminum, or metal tin, or a mixture of several of them; add the amount to reduce the gold content in the alloy to below 30%; heat up to melt the alloy; At the same time, in order to prevent metal oxidation at high temperature, the entire melting process needs to be protected by an inert gas, such as nitrogen or argon;

[0024] 2) Water quenching

[0025] Slowly pour the remelted alloy into cold water to quench the molten alloy into fine al...

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