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Method for recycling gold in gold-carrying carbon powder

A powdered carbon and gold-loaded technology, which is applied in the field of recovery of gold from gold-loaded powdered carbon, can solve problems such as lengthy and complicated processes, and achieve the effects of simplifying the process, reducing labor intensity, and improving the recovery rate

Active Publication Date: 2017-03-15
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for recovering gold in gold-loaded powdered charcoal to solve the problem of lengthy and complicated processes for recovering gold from gold-loaded powdered charcoal. The charcoal powder after ashing is directly recovered by a wet method, and the pyromelting step is omitted. Reduce the labor intensity of operators, improve the working environment, and increase the recovery rate of gold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Include the following steps:

[0034] (1) Charcoal ashing of gold powder:

[0035] Control the temperature at 600°C for ashing, so that the ashing of the gold-loaded powder carbon is complete, there is no charcoal residue, no agglomeration, and the dust is collected to reduce and avoid carbon ash damage;

[0036] (2) Nitric acid removal of impurities:

[0037] Use nitric acid to remove impurities from the carbon ash, and remove impurities from the carbon ash under the conditions of a liquid-solid ratio of 3:1, a nitric acid concentration of 30%, a reaction temperature of 70°C, and a reaction time of 2 hours, and then filter and wash to obtain the impurity-removed slag;

[0038] (3) Immersion gold:

[0039] Use the aqua regia method to leaching gold on the impurities-removing slag, so that the gold enters the liquid phase, as follows:

[0040] Under the conditions of a liquid-solid ratio of 4:1, an aqua regia / Au dosage of 3 g / g, a reaction temperature of 70°C, and a t...

Embodiment 2

[0046] Include the following steps:

[0047] (1) Charcoal ashing of gold powder:

[0048] The temperature is controlled at 625°C for ashing, so that the gold-loaded powdered carbon is completely ashed, there is no charcoal residue, no agglomeration, and the dust is collected to reduce and avoid carbon ash damage;

[0049] (2) Nitric acid removal of impurities:

[0050] Use nitric acid to remove impurities from the carbon ash, and remove impurities from the carbon ash under the conditions of a liquid-solid ratio of 6.5:1, a nitric acid concentration of 45%, a reaction temperature of 80°C, and a reaction time of 3.5 hours, and filter and wash to obtain a residue of impurities;

[0051] (3) Immersion gold:

[0052] Use the aqua regia method to leaching gold on the impurities-removing slag, so that the gold enters the liquid phase, as follows:

[0053] Under the conditions of a liquid-solid ratio of 7:1, an aqua regia / Au dosage of 6.5 g / g, a reaction temperature of 80°C, and a ...

Embodiment 3

[0059] Include the following steps:

[0060] (1) Charcoal ashing of gold powder:

[0061] Control the temperature at 650°C for ashing, so that the ashing of the gold-loaded powder carbon is complete, there is no charcoal residue, no agglomeration, and the dust is collected to reduce and avoid carbon ash damage;

[0062] (2) Nitric acid removal of impurities:

[0063] Use nitric acid to remove impurities from the carbon ash, and remove impurities from the carbon ash under the conditions of a liquid-solid ratio of 10:1, a nitric acid concentration of 60%, a reaction temperature of 90°C, and a reaction time of 5 hours, and then filter and wash to obtain the impurity-removed slag;

[0064] (3) Immersion gold:

[0065] Use the aqua regia method to leaching gold on the impurities-removing slag, so that the gold enters the liquid phase, as follows:

[0066] Under the conditions of a liquid-solid ratio of 10:1, an aqua regia / Au dosage of 10 g / g, a reaction temperature of 90°C, and ...

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Abstract

The present invention relates to a method for recovering gold in gold-carrying carbon powder, which belongs to treatment methods of gold-carrying carbon powder in the gold industry. The method includes ashing the gold-carrying carbon powder at 600 to 650 DEG C; removing impurities in the charcoal ash by nitric acid, filtering and washing to obtain the residue; leaching gold from the residue by the aqua regia method or chlorine salt method, resulting in the liquid-phase gold, filtering and washing to obtain gold leachate; adding sodium sulfite to the gold leachate; reducing the gold leachate, filtering and washing the sponge gold and drying; smelting the sponge gold with 1% to 5% of borax to cast ingot at 1250 DEG C. The method has the advantages that the process is simplified, the labor intensity of the operator is alleviated, the working environment is improved, and the recovery rate of gold-carrying carbon powder is increased.

Description

technical field [0001] The invention relates to a method for treating gold-loaded powdered carbon in the gold industry, which is mainly applied to the recovery of gold from the gold-loaded powdered carbon. Background technique [0002] Enterprises using all-slime cyanide carbon slurry gold extraction process will inevitably produce some gold-loaded powdered carbon in production. For these gold-loaded powdered carbons, the commonly used gold recovery method is to use self-made equipment for soil method ashing, and then add oxidation Lead or silver is collected and smelted by fire method, and then gold and silver are separated by nitric acid, gold is soaked in aqua regia, reduced, and cast into ingots. This method has the following disadvantages: [0003] 1. The process is long, the process is more, and the loss is greater; [0004] 2. It is difficult to control the temperature of charcoal during incineration, and there is often a phenomenon that the charcoal is not complete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/007C22B11/042Y02P10/20
Inventor 赵俊蔚
Owner CHANGCHUN GOLD RES INST
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