Method for leaching gold in alkaline thiourea system efficiently and stably

A gold leaching and alkaline technology, which is applied in the field of efficient and stable gold recovery, efficient gold leaching solution system, and efficient and stable alkaline thiourea system, can solve the problem of large-scale application of alkaline thiourea soluble gold and gold leaching rate low, thiourea is easy to decompose and other problems, to achieve the effect of no equipment, simple process, high gold leaching rate

Active Publication Date: 2013-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under these experimental conditions, thiourea is easy to decompose, consumes a lot of energy, and the gold leaching rate is not high, which limits the large-scale application of alkaline thiourea to dissolve gold.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Take 500g of cyanide tailings containing 1.08g / t of gold, 1.74% of arsenic, 0.53% of sulfur, and 10.85% of iron (the above are all mass percentages), and add water ball mill to make all ore particle size less than or equal to 0.074mm. Pour the ball-milled slurry into a clean glass container prepared in advance, and control the solid-to-liquid weight ratio of the ore to the aqueous solution to be 1:2.5. Stir with machinery at a stirring speed of 300r / min, add quicklime to make the pH = 10, and then add stabilizer, oxidant, leaching aid and thiourea in sequence. Among them, the concentrations of sodium hexametaphosphate and trisodium phosphate are 0.2 g / L and 0.1 g / L respectively, the dosage of calcium peroxide is 0.1 g / L, the concentration of EDTA is 0.1 g / L, and the concentration of thiourea is 0.2 g / L. Under normal pressure and stirring for 3.5 hours at 15°C, the leaching rate of gold was 80.4%.

Embodiment 2

[0033] Take 100g of high-grade gold ore containing 76.79 g / t of gold, 0.27% of arsenic, 0.29% of sulfur, 34.83% of iron, and 0.56% of copper (the above are all mass percentages), and add water ball mill to make all the ore particle size less than or equal to 0.074mm. Pour the ball-milled slurry into a clean glass container prepared in advance, and control the solid-liquid weight ratio of the ore to the aqueous solution to be 1:5. Stir with machinery at a stirring speed of 300r / min, add quicklime to make the pH=11, and then add stabilizer, oxidant, immersion aid and thiourea in sequence. Among them, the concentrations of sodium hexametaphosphate and trisodium phosphate were 0.7 g / L and 3.6 g / L respectively, the dosage of calcium peroxide was 1.4 g / L, the concentration of EDTA was 0.6 g / L, and the concentration of thiourea was 4.5 g / L. Under normal pressure and stirring for 7 hours at 20°C, the leaching rate of gold was 92.6%.

Embodiment 3

[0035] Take 50g of gold-containing solid waste containing 400.79 g / t of gold, 2.36% of copper, 100.29% of silver, and 4.36% of iron (the above are all mass percentages), and add water ball mill to make the particle size of all mineral materials less than or equal to 0.074mm. Pour the ball-milled slurry into a clean glass container prepared in advance, and control the solid-liquid weight ratio of the ore to the aqueous solution to be 1:10. Stir with machinery at a stirring speed of 300r / min, add quicklime to make the pH=11.5, and then add stabilizer, oxidant, immersion aid and thiourea in sequence. Among them, the concentrations of sodium hexametaphosphate and trisodium phosphate were 1.6 g / L and 8.0 g / L respectively, the dosage of calcium peroxide was 3.0 g / L, the concentration of EDTA was 0.3 g / L, and the concentration of thiourea was 10 g / L. Under normal pressure and stirring at 30°C for 15 hours, the leaching rate of gold was 85.3%.

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Abstract

The invention discloses a method for leaching gold in an alkaline thiourea system efficiently and stably. According to the method, under an alkaline condition, thiourea is taken as a gold leaching reagent, sodium hexametaphosphate or trisodium phosphate is taken as a stabilizing agent, calcium peroxide is taken as an oxidizing agent, EDTA (ethylene diamine tetraacetic acid) is taken as a leaching auxiliary, and gold in auriferous ores (tailings), gold fine powder and auriferous waste are recycled rapidly and efficiently. The method is characterized in that the stability of the thiourea under the alkaline condition is guaranteed, the gold leaching efficiency and the speed are high, the gold leaching system is non-toxic, the gold leaching process is simple, no corrosiveness is produced to devices, and the method is almost suitable for leaching gold in all auriferous materials.

Description

technical field [0001] The invention belongs to the field of organic and inorganic chemistry, and relates to a method for leaching gold with an efficient and stable alkaline thiourea system. It specifically relates to a high-efficiency gold leaching solution system of alkaline thiourea composed of a stabilizer, an oxidant and a leaching aid, and the efficient and stable recovery of extracting gold from gold-containing ores, gold fine powder and gold-containing waste by using the system gold method. Background technique [0002] So far, the classic cyanidation method for dissolving gold is seriously polluted and the efficiency of leaching gold is low. The non-cyanidation method, the halogenation method, the magnetic carbon method, the thiocyanate method, the polysulfide method, the lime sulfur method, and the thiosulfate method cannot be used in industrial gold extraction due to their respective shortcomings in gold melting. Bigger. [0003] Since 1941, the former Soviet U...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B11/00
CPCY02P10/20
Inventor 刘有才朱忠泗符剑刚李丽峰林清泉
Owner CENT SOUTH UNIV
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