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A method for synchronous cyanide-free leaching of primary gold ore chemical pre-oxidation

A technology for pre-oxidation and gold ore, which is applied in the direction of improving process efficiency, can solve the problems of long production cycle, low safety, and great influence on leaching rate, and achieves the effect of low cost and improved leaching rate of pre-oxidation.

Active Publication Date: 2020-04-07
贵州省地质矿产中心实验室
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The four major pre-oxidation processes have their own advantages and disadvantages. Roasting pre-oxidation is quick and easy, but the effect of pre-oxidation is greatly affected by the conditions of the roaster and produces a large amount of SO 2 Smoke, containing As 2 o 3 Toxic smoke and dust cause serious environmental pollution; the cost of biological pre-oxidation is relatively low, but the production cycle is long, and the leaching rate is greatly affected by ore composition and ambient temperature; the production process of chemical pre-oxidation is stable, but it needs to consume a large amount of chemical reagents, arsenic and other harmful components It needs to be treated when entering the solution; hot-press pre-oxidation needs to be operated under high temperature and high pressure conditions, the leaching rate is high, but the energy consumption is high, the equipment requirements are high, and the safety is low
[0009] Overall, existing technologies are still not ideal

Method used

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  • A method for synchronous cyanide-free leaching of primary gold ore chemical pre-oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take 10 kg of flotation gold concentrate, add 10 kg of water, ultra-finely grind to 96-98%-38μm, and wash all the pulp into the reaction kettle with 10 kg of water several times. At this time, the concentration of the pulp is 33.3%. Add 1kg of quicklime and 1.7kg of soda ash under stirring conditions, heat up to 35°C, ultrasonically treat for 4 hours, pre-oxidize for 72 hours, filter, wash slag three times, combine the filtrates, use activated carbon to adsorb gold according to the conventional process, and electrolyze the gold-loaded carbon to recover gold .

Embodiment 2

[0054] Take 10 kg of flotation gold concentrate, add 10 kg of water, ultra-finely grind to 94-96%-38μm, and wash all the pulp into the reactor with 15 kg of water several times. At this time, the concentration of the pulp is 28.6%. Add 1.5kg of quicklime and 2.5kg of soda ash under stirring conditions, heat up to 45°C, ultrasonically treat for 3 hours, pre-oxidize for 48 hours, filter, wash the slag three times, combine the filtrates, use activated carbon to adsorb gold according to the conventional process, and electrolyze the gold-loaded carbon to recover gold.

Embodiment 3

[0056] Take 10 kg of flotation gold concentrate, add 10 kg of water, ultra-finely grind to 92-94%-38 μm, and wash all the pulp into the reaction kettle with 20 kg of water several times. At this time, the concentration of the pulp is 25%. Add 2.0kg of quicklime and 3.3kg of soda ash under stirring conditions, heat up to 55°C, ultrasonically treat for 2 hours, pre-oxidize for 36 hours, filter, wash the slag three times, combine the filtrates, use activated carbon to absorb gold according to the conventional process, and electrolyze the gold-loaded carbon to recover gold.

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Abstract

The invention discloses a method for conducting chemical pre oxidizing treatment on a primary gold ore and achieving cyanide-free leaching synchronously. According to the method, a complex reaction ofthiosulfate generated in a pre oxidizing reaction and gold is utilized to form a thiosulfate complex of gold, then gold dissolves and is leached out, and accordingly pre oxidizing treatment and simultaneous cyanide-free gold leaching are achieved. Under the warming condition at the normal pressure, in a NaOH medium generated in a pre oxidizing assistant agent, oxygen in air and sulfide minerals such as arsenopyrite and pyrite are subjected to pre oxidizing reaction to generate thiosulfate, thiosulfate and gold generate the complex to leach out gold, accordingly simultaneous cyanide-free leaching is achieved, and the leaching efficiency of gold can be as high as 93.29%. However, in other pre oxidizing technologies, after pre oxidizing treatment is completed, sodium cyanide further needs tobe added to leach out gold in the minerals.

Description

technical field [0001] The invention belongs to the technical field of mineral development, and specifically relates to a method for chemical pre-oxidation and synchronous cyanide-free leaching of primary gold mines in Guizhou area. Background technique [0002] Gold mine is one of the seven advantageous minerals in Guizhou Province. As of 2014, 83 ore deposits and ore points have been discovered in Guizhou Province, and the reserves of gold resources are 286.66 tons, ranking 8th in the country. It is one of the newly emerging gold production bases in China. Guizhou is the first province in the country where the largest proven reserves of "Carlin-type" and "later-type" gold deposits have been discovered. The prospective reserves of the gold industry can reach more than 1,200 tons. [0003] The gold deposits in Guizhou Province are mainly distributed in the southeast and southwestern regions of Guizhou. The gold deposits in the southeastern region are mainly natural gold, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/12C22B3/24C22B3/44C22B11/00
CPCC22B3/12C22B3/24C22B3/44C22B11/04Y02P10/20
Inventor 陈文祥余红林朱志雄张周位邓强陈婧陈丽荣黄苑龄
Owner 贵州省地质矿产中心实验室
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