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Cyanide leaching method for gold ores

A cyanide leaching and leaching technology, which is applied in the field of cyanidation leaching of refractory gold ores, can solve problems such as difficulty in improving the gold leaching effect, and achieve the effects of avoiding operational safety hazards, improving cyanide leaching rate, and simple process

Active Publication Date: 2011-07-06
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to go through flotation or classification before cyanide leaching after alkali leaching pretreatment, and it is difficult to improve the gold leaching effect for some refractory gold ore under normal temperature alkali pretreatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] For a refractory gold ore with a gold grade of 5.24g / t, the leaching rate obtained by direct application of the conventional cyanide leaching process is only 14.24%. After the ore is crushed and ground to -0.020mm, potassium permanganate and sodium hydroxide are added for heating and stirring pretreatment. The pretreatment conditions are: adding potassium permanganate 100kg / t -干矿 , sodium hydroxide 100kg / t -干矿 , the pulp concentration is 25%, the linear stirring speed is 5m / s, the heating temperature is 80°C, and the processing time is 8h. The gold leaching rate of 92.36% was obtained by applying the conventional cyanidation leaching process to the pretreated pulp after washing and filtering.

Embodiment 2

[0016] For a refractory gold ore with a gold grade of 9.06g / t, the leaching rate obtained by direct application of the conventional cyanide leaching process is only 17.73%. After the ore is crushed and ground to -0.003mm, potassium permanganate and sodium hydroxide are added for heating and stirring pretreatment. The pretreatment conditions are: adding potassium permanganate 30kg / t -干矿 , sodium hydroxide 200kg / t -干矿 , the pulp concentration is 15%, the linear stirring speed is 8m / s, the heating temperature is 60°C, and the processing time is 24h. After the pretreated pulp was washed and filtered, the conventional cyanidation leaching process was applied to obtain a gold leaching rate of 95.68%.

Embodiment 3

[0018] For a refractory gold ore with a gold grade of 3.92g / t, the leaching rate obtained by direct application of the conventional cyanide leaching process is only 8.84%. After the ore is crushed and ground to -0.008mm, potassium permanganate and sodium hydroxide are added for heating and stirring pretreatment. The pretreatment conditions are: adding potassium permanganate 150kg / t -干矿 , sodium hydroxide 50kg / t -干矿 , the pulp concentration is 55%, the linear stirring speed is 4m / s, the heating temperature is 90°C, and the processing time is 3h. After the pretreated pulp was washed and filtered, the conventional cyanidation leaching process was applied to obtain a gold leaching rate of 82.61%.

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Abstract

The invention provides a cyanide leaching method for gold ores, and relates to a cyanide leaching method for refractory gold ores. The method is characterized by comprising the following steps: firstly crashing ores, grinding, adding potassium permanganate and sodium hydroxide and carrying out the heating and stirring pretreatment, then washing and filtering the treated ore pulp, and carrying outthe cyanide leaching process. The method has the advantages of simple flow, easy operation, low investment, low operation cost and less environmental pollution, and can greatly improve the cyanide leaching rate of the gold ores difficult to leach.

Description

technical field [0001] The invention relates to a cyanide leaching method of gold ore, which relates to a cyanide leaching method of refractory gold ore. Background technique [0002] The reserves of refractory gold ore account for 60% of the world's total gold reserves. With the depletion of easy-leachable gold ore resources, the recovery of gold from refractory gold ore is increasingly showing its importance. At present, one-third of the world's gold production More than one percent is from refractory gold deposits, and the proportion is still increasing. [0003] At present, the pretreatment methods for refractory gold ore mainly include roasting, pressurized oxidation, bacterial oxidation and chlorination. Among them, roasting and pressure oxidation have been widely used in industry at home and abroad. Roasting is a traditional and effective pretreatment method, but its treatment cost is high and it pollutes the environment seriously. Pressurized oxidation requires a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08
Inventor 王福良魏明安贺政罗科华赵志强周东琴
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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