Beneficiation method for high-carbon micro-fine particle sub-microscopic gold ore

A beneficiation method and fine-grained technology, which is applied in the beneficiation field of high-carbon fine-grained microscopic gold ore, can solve the problems of inability to realize effective recovery of gold, large amount of sodium cyanide, and low leaching rate, and achieve wide application range, The effect of low production cost and improving gold leaching rate

Active Publication Date: 2017-11-07
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyanide leaching, the presence of carbon causes a large amount of sodium cyanide, high cost, and low leaching rate
Single oxidation roasting does not achieve effective recovery of gold

Method used

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  • Beneficiation method for high-carbon micro-fine particle sub-microscopic gold ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Grinding process: A carbon-containing fine-grained microscopic gold mine in Gansu, the gold grade is 4.41g / t, the grinding concentration is 55%, and the pH regulator sodium carbonate 3000g / t is added during grinding, and the gangue inhibitor Carboxymethyl cellulose: Sodium hexametaphosphate is added at a ratio of 1:1, 500g / t is added, and the amount of kerosene is 30g / t for grinding. The grinding fineness is less than 0.074mm, and the content is 80%.

[0016] 2. Flotation process: the mass percentage concentration of the pulp is 30%, the activator is copper sulfate, the dosage is 200 g / t, the foaming agent butyl xanthate is 200g / t, and the dosage of 2# oil is 30g / t, after roughing and sweeping, flotation coarse concentrate and flotation tailings are obtained.

[0017] 3. The coarse concentrate is regrinded and re-selected, the grinding concentration is 55%, and the gangue inhibitor carboxymethyl cellulose: sodium hexametaphosphate is added at a ratio of 1:1, and the ...

Embodiment 2

[0022] 1. Grinding process: A carbon-containing fine-grain microscopic gold mine in Tibet, the gold grade is 5.25g / t, the grinding concentration is 55%, and the pH regulator sodium carbonate 3500g / t and gangue inhibitor are added during grinding. Carboxymethyl cellulose: Sodium hexametaphosphate is added at a ratio of 1:1, 800g / t is added, and the amount of kerosene is 40g / t for grinding. The grinding fineness is less than 0.074mm, and the content is 85%.

[0023] 2. Flotation process: the mass percentage concentration of the pulp is 30%, the activator is copper sulfate, the dosage is 200 g / t, the foaming agent butylxanthate dosage is 250g / t, and the dosage of 2# oil is 30g / t, after roughing and sweeping, flotation coarse concentrate and flotation tailings are obtained.

[0024] 3. The coarse concentrate is regrinded and re-selected, the grinding concentration is 55%, and the gangue inhibitor carboxymethyl cellulose: sodium hexametaphosphate is added at a ratio of 1:1, and the...

Embodiment 3

[0029] 1. Grinding process: A carbon-containing fine-grain microscopic gold mine in Xinjiang, the gold grade is 3.26g / t, the grinding concentration is 55%, and the pH regulator sodium carbonate 3000g / t and gangue inhibitor are added during grinding. Carboxymethyl cellulose: Sodium hexametaphosphate is added at a ratio of 1:1, 600g / t is added, and the amount of kerosene is 35g / t for grinding. The grinding fineness is less than 0.074mm, and the content is 85%.

[0030] 2. Flotation process: the mass percentage concentration of the pulp is 30%, the activator is copper sulfate, the dosage is 250 g / t, the foaming agent butylxanthate dosage is 200g / t, and the dosage of 2# oil is 30g / t, after roughing and sweeping, flotation coarse concentrate and flotation tailings are obtained.

[0031] 3. Grinding the coarse concentrate, the grinding concentration is 55%, adding gangue inhibitor carboxymethyl cellulose: sodium hexametaphosphate at 1:1, adding 300g / t grinding fineness to less than ...

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Abstract

The invention discloses a beneficiation method for high-carbon micro-fine particle sub-microscopic gold ore, and belongs to the technical field of mineral processing. Roasted ore, namely, concentrated gold ore, is obtained by performing flotation after gold ore is ground, grinding and selecting the floated concentrated gold ore again, and performing oxidizing roasting on the floated concentrated gold ore. The content of carbon and sulphur in the floated concentrated gold ore is high; and when iron pyrite in the floated concentrated gold ore is enriched to a certain degree, the gold grade is difficult to improve. The concentrated gold core with high quality can only be obtained through the oxidizing roasting. Two-section oxidizing roasting is performed on floated tailings so as to prevent over-roasting or under-roasting, and a sulphide which coats the gold is damaged through roasting so that cracks appear on a gold-loaded mineral structure to inhibit negative impact of organic carbon on subsequent cyaniding gold extracting process; and therefore, the purpose of remarkably improving the leading rate of gold is achieved. The method has the characteristics of low production cost, high gold recovery rate, high adaptability, wide application range and the like; and recycling and utilization of the ore are realized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a beneficiation method of high-carbon fine-grain microscopic gold ore. Background technique [0002] With the decrease of easy-to-handle gold mines, difficult-to-handle gold mines will become the main resource of gold ore in the future. Among the proven gold reserves in my country, about 30% of the gold ore is refractory gold ore. How to better develop and utilize refractory gold ore has become one of the main tasks of the gold industry. [0003] As one of the refractory gold ores, the treatment methods of carbon-containing fine-grained micro-gold ores mainly include: flotation, cyanide leaching, oxidation roasting and their combined processes. In the single flotation method, it is also difficult to achieve monomer dissociation through fine grinding, and when the pyrite in the gold concentrate is enriched to a certain extent, the gold grade is difficult to increase. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/04C22B11/08B03B9/00
CPCB03B9/00C22B1/02C22B3/04C22B11/04C22B11/08Y02P10/20
Inventor 郭艳华郭海宁杨俊龙包玺琳廖雪珍袁艳彭贵熊彭建城
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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