Sodium cyanate gold leaching technology

A gold leaching and leaching technology with sodium cyanate is applied in the field of gold leaching with sodium cyanate to achieve the effects of reducing production cost, green and safe process, and simple operation.

Active Publication Date: 2014-12-24
FUJIAN SHUANGQISHAN MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] At present, there are few reports on the use of low-toxic sodium cyanate to replace highly toxic sodium cyanide and other reagents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Firstly, the sulphur-containing gold ore ball mill is processed, and the fineness of the gold concentrate mineral material obtained after the treatment is -400 mesh accounting for 85%; then the slurry is adjusted so that the slurry-to-solid mass ratio is 2:1, and then it is added to the system in sequence Add 4kg / t of leaching aid Cao, 2kg / t of leaching aid Na 2 CO 3 , Adjust the pH of the system to 9.0, and finally add the gold leaching agent sodium cyanate with an amount of 0.5‰ of the weight of the gold concentrate. After leaching at 20-30°C for 10 hours, the gold leaching rate reaches 97.2%.

Embodiment 2

[0040] Firstly, the ball mill for sulfur-containing gold mines is processed, and the fineness of the gold concentrate obtained after the treatment is -400 mesh accounting for 90%; then the slurry is adjusted so that the slurry-to-solid mass ratio is 3:1, and then it is added to the system in turn Add 6kg / t of leaching aid Cao, 2kg / t of leaching aid Na 2 CO 3 , Adjust the pH of the system to 9.6, and finally add the gold leaching agent sodium cyanate, the amount is 3‰ of the weight of the gold concentrate, after leaching at 20-30℃ for 4 hours, the gold leaching rate reaches 98.7%.

Embodiment 3

[0042] Firstly, the gold oxide ore ball mill is processed, and the fineness of the gold concentrate mineral material obtained after the processing is -400 mesh accounting for 90%; then the slurry is adjusted so that the slurry-to-solid mass ratio is 4:1, and then it is added to the system in sequence 7kg / t of leaching aid Cao, 3kg / t of leaching aid Na 2 CO 3 , Adjust the pH of the system to 11.2, and finally add the gold leaching agent sodium cyanate, the amount of which is 5‰ of the weight of the gold concentrate. After leaching at 20-30°C for 10 hours, the gold leaching rate reaches 98.6%.

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Abstract

The invention discloses a sodium cyanate gold leaching technology, comprising the steps of: grinding gold concentrate to enable 400-mesh particles to be 85%-95% of grinded gold concentrate, mixing to be thick liquid with a liquid-solid mass ratio of 2:1 to 5:1, adding 8kg / t of Cao4 and 1-3kg / t of Na2CO3 as leaching agents, adjusting a system pH value to be 9-12, adding 0.05-0.8% of sodium cyanate as a gold leaching agent, and leaching for 4-18 hours. The gold leaching technology is simple in process, high in gold leaching efficiency, small in pollution to environment, small in reagent use amount and cheap in price. According to the sodium cyanate gold leaching technology, corrosion influence of reaction on equipment is small; the sodium cyanate gold leaching technology is low in requirement and cost, and has industrial application prospects.

Description

Technical field [0001] The invention belongs to the technical field of environmentally friendly gold leaching, and specifically relates to a sodium cyanate leaching method for gold. Background technique [0002] Gold is one of the important precious metals and has long been used as a financial reserve and precious jewelry. [0003] And with excellent performance, gold has also been widely used in modern high-tech industries, such as electronics, communications, aerospace, chemical, medical and other technical fields. [0004] At present, the gold industry generally uses cyanidation technology to extract gold from minerals because it is relatively simple, effective and economical. [0005] Due to the high toxicity of cyanide, the adult lethal dose is only 50 mg. Therefore, the use of cyanide has caused people to worry about the environment. [0006] At present, some countries and regions have banned the use of cyanide; the kinetics of the gold extraction process by cyanidation technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08
Inventor 谢文清肖坤明郑新烟陈金武
Owner FUJIAN SHUANGQISHAN MINING
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