Method for leaching gold in alkaline thiourea system efficiently and stably

A gold leaching and alkaline technology, which is applied in the fields of efficient and stable gold recovery, efficient and stable alkaline thiourea system, and high-efficiency gold leaching solution system. 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: 2014-07-02
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 with an efficient and stable alkaline thiourea system. The method is to use thiourea as a gold leaching agent and sodium hexametaphosphate or trisodium phosphate as a stabilizer under alkaline conditions. Calcium peroxide is used as an oxidizing agent, and EDTA is used as a leaching aid to quickly and efficiently recover gold from gold-bearing ores (tailings), gold fine powder and gold-bearing waste. The characteristics of the present invention are: the stability of thiourea under alkaline conditions is guaranteed, the gold leaching efficiency is high, the speed is fast, the gold leaching system is non-toxic, the gold leaching process is simple, non-corrosive to equipment, and almost applicable For leaching of gold from all gold-bearing materials.

Description

Technical field [0001] The present invention is an organic and inorganic chemical field, involving a method of high -efficiency and stable alkaline sulfur system for dipping gold.Specifically involved an efficient gold solution system for alkaline sulfur sulfur composed of stabilizers, oxidants, and immersion agents, as well as the efficient and stable recovery of gold ore, golden essence and gold -containing waste from gold ore, golden essence, and gold waste.Gold method. Background technique [0002] So far, the classic cyanide method is seriously polluted and the efficiency of gold dipping is low.Non -cyanide halide method, magnetic carbon method, thiosiocyanate method, polysulfide method, stone sulfur synthetic method, and sulfur sulfate method, etc., can not be available in industrial funds due to their own shortcomings.Larger. [0003] Since the former Soviet Union Placksin and others reported the use of acid sulfur sulfur, this method has always become the attention of the...

Claims

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Application Information

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Patent Type & Authority Patents(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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