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Biological heap leaching metal technique for low grade unwieldiness gold ore

A technology for refractory gold mines and biological heaps, which is applied in the gold leaching process of oxidation pretreatment of gold-bearing minerals by using exclusive gold ore microorganisms, and in the field of bioheap leaching gold extraction technology, which can solve the problem of high cost of recovery process and long process flow , Difficult to deal with gold ore and other problems, to achieve the effect of increasing production safety, short process flow and simple equipment

Inactive Publication Date: 2008-08-27
CHINA NAT GOLD GROUP CORP TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a bio-heap leaching gold extraction process for low-grade refractory gold ores, which solves the problems of high cost, long process flow, and environmental pollution of conventional recovery processes

Method used

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  • Biological heap leaching metal technique for low grade unwieldiness gold ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present invention is applied to a low-grade refractory gold mine in Liaoning Province. The average ore grade is 2.99g / t. The metal mineral composition in the ore is mainly metal sulfide minerals. The analysis and measurement results of the ore mineral composition are shown in Table 1.

[0026] Table 1 Analysis and measurement results of ore mineral composition of a low-grade refractory gold mine in Liaoning Province

[0027] metal minerals

gangue minerals

mineral name

Average content (%)

mineral name

Average content (%)

pyrite

5.62

quartz

66.00

arsenopyrite

1.24

Calcite, dolomite, magnesite

18.00

chalcopyrite, tetrahedrite

0.10

Chlorite

2.90

Sphalerite

0.07

Feldspar

2.70

Galena

0.03

graphite

1.02

other

2.32

Total Metal Minerals

7.06

Total gangue minerals

92.94

[0028] From t...

Embodiment 2

[0046] The present invention is applied to the low-grade refractory gold mine in Wushan, the average ore grade of which is 2.34g / t, and the analysis and measurement results of the mineral composition of the ore are shown in Table 2.

[0047] Table 2 Analysis and measurement results of ore mineral composition of Wushan low-grade refractory gold mine

[0048] metal minerals

Relative content (%)

mineral name

Average content (%)

pyrite

3.07

quartz

Feldspar

76.07

Chalcopyrite

0.49

Galena

0.23

Sericite

8.55

Sphalerite

0.38

Clay minerals

garnet

8.66

Molybdenite

0.01

Tetrahedrite, Chalcocite, Bornite

0.11

carbonate

0.40

Limonite

0.46

other

1.62

white lead ore

trace

total

4.75

95.25

[0049] According to the characteristics of the ore, the ore proc...

Embodiment 3

[0067] The present invention is applied to a low-grade refractory gold mine in Yunnan, where the gold grade is 1.5g / t, and the analysis and measurement results of the mineral composition of the ore are shown in Table 3.

[0068] Table 3 Mineral composition analysis and measurement results of a low-grade refractory gold mine in Yunnan

[0069] metal minerals

gangue minerals

mineral name

Average content (%)

mineral name

Average content (%)

pyrite

1.08

quartz

73.88

Arsenopyrite, orthorhombic arsenite

0.48

Calcite, Dolomite

9.45

Galena

0.09

Feldspar

5.80

Sphalerite

0.03

Chlorite

4.90

Chalcopyrite

0.03

graphite

1.32

Limonite

0.32

other

2.38

scorodite

0.14

Total Metal Minerals

2.17

Total gangue minerals

97.83

[0070] According to the characteristics of the ore, the gol...

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Abstract

The invention relates to a heap bioleaching gold extraction technique of gold ore which has low grade and is difficult to process, which belongs to the metallurgical chemical industry type. The technique comprises the following steps: firstly, disintegrating ores which contain gold minerals to granulate and pile, secondly, doing acid treatment for ores, thirdly, utilizing microorganism to do biological pre oxidation for ores, cyaniding leaching after acid and alkali transformation, and finally, recycling gold. The technique of the invention has the advantages of low production cost, low energy consumption, low medicament consumption, low labor force demand, short technique process, simple equipment, easy application, low investment cost and wide resource utilization, which has no discharge gas, and can be considered as discharging without waste material and waste water in some extent, and the technique can improve the environment, which is beneficial for the environment, and increases production security.

Description

technical field [0001] The invention relates to metallurgy and chemical industry, in particular to a bioheap leaching gold extraction process for low-grade refractory gold ores, especially a gold leaching process for oxidation pretreatment of gold-bearing minerals by using exclusive gold mine microorganisms. Background technique [0002] As we all know, in my country's refractory mineral resource reserves, most of the gold and copper mines are low-grade and refractory resources. According to relevant statistics, the proven refractory gold ore resources in my country account for about 100% of the total proven reserves. More than 50% of the total reserves, and most of them are low-grade. Among the proven copper resources, those with a copper grade of less than 0.7% account for 56% of the total reserves, and those with an ore grade of more than 1% only account for 20% of the total copper reserves; therefore , The comprehensive utilization of this part of low-grade and refractory ...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 高金昌郝福来金世斌巩春龙李昌寿
Owner CHINA NAT GOLD GROUP CORP TECH CENT
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