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Method for quickly leaching gold and silver by using mixed leaching agent

A leaching agent, gold and silver technology, applied in the field of hydrometallurgy, can solve the problems of high concentration of chemicals and harsh conditions, and achieve the effects of high leaching rate, peaceful production environment and easy operability

Inactive Publication Date: 2011-07-06
梁伟基 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of high reagent concentration and harsh conditions in other gold leaching methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Sulfuric acid slag from Hengyang Sulfuric Acid Factory in Hunan is 10 kg. The main elements of the slag are as follows: 3% sulfur, 2% arsenic, 30% iron, 5 g / ton gold, and 30 g / ton silver.

[0021] Washing and leaching with full mud cyanide carbon slurry

[0022] Grind the sulfuric acid slag to 300 mesh, and wash and leach with the whole mud cyanide carbon slurry for 48 hours, and the leaching rate is only about 35%. The tailings contain about 3 grams / ton of gold and 20 grams / ton of silver. It is a type of refractory ore.

[0023] Leach with the method of the present invention;

[0024] 1. Grind the sulfuric acid slag to 300 mesh.

[0025] 2. According to the liquid-solid ratio of 3:1, mix and stir for leaching.

[0026] 3. Use sulfuric acid to adjust the pH of the pulp to 0.5; put 0.3 kg of ammonium thiocyanate and 0.15 kg of sulfur into the pulp

[0027] Urea, 0.09 kg urea and 0.5 kg manganese dioxide.

[0028] 4. Stirring and leaching for 4 hours, the gold leach...

Embodiment 2

[0030] A 10-kg gold sample from a place in Hezhou, Guangxi has the following main element contents: 15% sulfur, 1.5% arsenic, and 12.5 g / t gold. The type of gold mine is quartz veins with visible gold. Silver 300g / t,

[0031] Leach by this method;

[0032] 1. Grind the gold ore to 200 mesh,

[0033] 2. According to the liquid-solid ratio of 3:1, stir and leaching

[0034] 3. Use sulfuric acid to adjust the pH of the pulp to 0.5, and put 0.3 kg of ammonium thiocyanate, 0.15 kg of thiourea, 0.09 kg of urea and 0.5 kg of manganese dioxide into the pulp.

[0035] 4. Stirring and leaching for 4 hours, the gold leaching rate reaches 95%, the tailings contain 0.65 g / ton of gold, the silver leaching rate is 95%, and the tailings contain 15 g / ton of silver.

Embodiment 3

[0037] 100 kg of oxidized ore from a gold mine in Baise, Guangxi, the element content is as follows; sulfur 0.5%, arsenic 1.5%, gold 3.5 g / ton, silver 8.5 g / ton,

[0038] 1. Grind the gold ore to 120 mesh,

[0039] 2. According to the liquid-solid ratio of 3; 1, mixing and stirring leaching

[0040] 3. Use sulfuric acid to adjust the pH of the pulp to 0.5, and put 0.3 kg of ammonium thiocyanate, 0.3 kg of thiourea, 0.3 kg of urea and 1 kg of manganese dioxide into the pulp.

[0041] 3. Stirring and leaching for 4 hours, the gold leaching rate reaches 95%, the tailings contain 0.18% gold, the silver leaching rate is 93%, and the tailings contain 0.6 g / ton of silver.

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PUM

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Abstract

The invention discloses a method for quickly leaching gold and silver by using a mixed leaching agent, which comprises the following steps of: crushing gold-containing pyrite smelting slag, a sulfide-containing visible gold ore or / and a gold-containing oxidized ore serving as raw materials, conditioning the raw materials with water to form slurry, adding ammonium thiocyanate, thiocarbamide, urea and an oxidant, namely manganese dioxide or ferric chloride, into the ore slurry and stirring and leaching the mixed slurry to leach the gold and silver out. The method has the advantage that: the mixed leaching agent formed by adding the urea into the ammonium thiocyanate can quickly leach the gold and the silver out of the sulphur and arsen-containing gold ore by adding the urea with a low cost,particularly the gold and the silver which are contained in pyrolusite can be leached out with a lower cost. At the same time, beneficial elements in the ores can be comprehensively used.

Description

technical field [0001] The invention belongs to hydrometallurgy technology, in particular to a method for rapidly extracting gold and silver from gold and silver ores containing sulfur and arsenic or gold and silver ores in oxidized ores by using ammonium thiocyanate or thiocyanate plus thiourea. Background technique [0002] At present, there are not many methods for extracting gold and silver from sulfur-containing arsenic gold and silver ores. Except for the cyanidation method, the concentration of other methods is very high, so that the cost increases. For example; thiocyanate method; the concentration of thiocyanate in the aqueous solution of thiocyanate must reach 5% to achieve a leaching rate of about 90%. If the tailings are not treated with disinfection, it will have a serious impact on the environment. Otherwise, the leaching conditions are harsh and difficult to promote in production. Such as thiourea, the concentration of gold and silver dipped in thiourea alon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08
Inventor 梁伟基梁增扬
Owner 梁伟基
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