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Cyanide-free extractant and gold extracting method

An extraction method and extraction agent technology, applied in the field of cyanide-free extraction agent and gold extraction, can solve the problems of high toxicity, low leaching efficiency of refractory ore, pollution of the environment, etc., achieve high leaching rate, short leaching time, and increase leaching rate Effect

Active Publication Date: 2016-12-07
和晶(上海)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of cyanide-free extraction agent and gold extraction method, be used to solve the deficiency of traditional cyanide process, as pollution environment, highly toxic, refractory ore without pre-treatment Dealing with issues such as low leaching efficiency

Method used

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  • Cyanide-free extractant and gold extracting method

Examples

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Effect test

Embodiment 1

[0049] A cyanide-free extractant is used for extracting gold, wherein: the cyanide-free extractant comprises amino acids with a mass fraction of 0.5%-2%, an alkali with a mass fraction of 0.2%-2%, and the solvent is water. The amino acids include one or more of glycine, alanine, aspartic acid, phenylalanine, leucine, and histidine. The alkali includes one or more of caustic soda, quicklime and slaked lime.

Embodiment 2

[0051] A cyanide-free extractant is used for extracting gold, wherein: the cyanide-free extractant comprises amino acids with a mass fraction of 0.5%-1.5%, an alkali with a mass fraction of 0.2%-2%, and the solvent is water. The pH value of the cyanide-free extractant is 9-13. The amino acids include one or more of glycine, alanine, aspartic acid, phenylalanine, leucine, and histidine. The alkali includes one or more of caustic soda, quicklime and slaked lime.

Embodiment 3

[0053] A cyanide-free extractant is used for extracting gold, wherein: the cyanide-free extractant comprises amino acids with a mass fraction of 0.6%-1%, an alkali with a mass fraction of 0.2%-2%, and the solvent is water. The pH value of the cyanide-free extractant is 10-12. The amino acids include one or more of glycine, alanine, aspartic acid, phenylalanine, leucine, and histidine. The alkali includes one or more of caustic soda, quicklime and slaked lime.

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Abstract

The invention provides a cyanide-free extractant and a gold extracting method. The cyanide-free extractant comprises, by mass percentage, 0.5-2% of amino acid and 0.2-2% of alkali, wherein water serves as a solvent. According to the gold extracting method, the amino acid gold extracting agent free of toxicity to the environment is adopted for leaching of gold, the method is environmentally-friendly, free of toxin, short in leaching time and high in leaching rate, and waste water can be drained after being simply treated. According to the cyanide-free extractant and the gold extracting method, the leaching rate of gold ore easy to leach is high, is larger than 90% and can reach 95%; for traditional gold ore difficult to leach, such as ore which is not pretreated and contains pyrite cyanide arsenopyrite, the leaching rate is high as well and is larger than 85%, and the leaching rate is less than 30% compared with the leaching rate of a traditional cyaniding process of the same type of ore which is not pretreated, so that by the adoption of the cyanide-free extractant and the gold extracting method, the leaching rate of the gold ore difficult to leach can be increased greatly.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and designs a cyanide-free extraction agent and a gold extraction method. Background technique [0002] The gold extraction process by cyanidation is the main method for extracting gold from ores or concentrates. Since 1889, the first cyanidation gold extraction plant in the world was built in New Zealand's Keluen Mine. Cyanide gold extraction has a history of more than 100 years. Cyanide gold extraction has the characteristics of high recovery rate and wide ore adaptability. . However, due to the highly toxic properties of cyanide, the production, transportation, storage, use and waste containing cyanide all pose a huge threat to the environment and human health. Its heap leaching gold poses a huge threat to surface water, groundwater and soil. Nowadays, people pay more and more attention to environmental protection, so the use of cyanide will be more and more restricted. [0003] In addition,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/12
CPCC22B3/12C22B11/04Y02P10/20
Inventor 姜标李继香赵延琴
Owner 和晶(上海)新能源科技有限公司
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