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A bioleaching method for strengthening chalcopyrite and bornite

A bioleaching and bornite technology, applied in the direction of improving process efficiency, can solve the problems of slow leaching rate and low microbial leaching rate, and achieve the effect of strengthening bioleaching

Inactive Publication Date: 2017-09-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the targets of copper biohydrometallurgy industry are mostly secondary copper sulfide ores dominated by chalcopyrite, while the most abundant copper reserves on the earth are low-grade copper ores containing chalcopyrite and bornite. Stones, and usually associated with them, are difficult to be treated economically and effectively by conventional dressing and smelting techniques, making them a new target for the industrialization of biometallurgical copper extraction.
However, the microbial leaching rate of chalcopyrite and bornite is low and the leaching rate is slow, which is the bottleneck of the industrialization of copper ore biohydrometallurgy technology.

Method used

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  • A bioleaching method for strengthening chalcopyrite and bornite
  • A bioleaching method for strengthening chalcopyrite and bornite
  • A bioleaching method for strengthening chalcopyrite and bornite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Acidithiobacillus ferrooxidans (CCTCC AB206207) was selected as the ore leaching bacteria, and pure minerals of chalcopyrite and bornite were artificially mixed.

[0028] Comparison index: After 30 days of leaching, the leaching rate of chalcopyrite alone is 30%, and that of bornite is 60%; mineral samples are ground first until the content of -0.074mm reaches more than 80%, and chalcopyrite and bornite are controlled The mass ratio is 4:1-1:4; the stirring speed of the leaching process is controlled at 100-600rpm, the pH value of the leaching process is controlled at 1.5-2.5, and the solution potential is controlled at 350-480mV (Ag / AgCl is the reference electrode ), the Cu leaching rate is higher than that of chalcopyrite alone and bornite alone, and the highest Cu leaching rate can reach more than 73%. (See figure 2 )

[0029] In summary, the present invention significantly strengthens the bioleaching of chalcopyrite and bornite.

Embodiment 2

[0030] Example 2: Acidithiobacillus caldus (CCTCC AB 206240) was selected as the leaching bacteria to artificially mix chalcopyrite and bornite pure minerals.

[0031] Comparison index: After 30 days of leaching, the leaching rate of chalcopyrite alone is 23%, and that of bornite alone is 41%. The mass ratio is 5:1-1:5; the stirring speed of the leaching process is controlled at 100-600rpm, the pH value of the leaching process is controlled at 1.5-2.5, and the solution potential is controlled at 350-480mV (Ag / AgCl is the reference electrode ), the Cu leaching rate is higher than that of chalcopyrite alone and bornite alone, and the highest Cu leaching rate can reach more than 88%. (See image 3 )

[0032] In summary, the present invention obviously strengthens the bioleaching of chalcopyrite and bornite.

Embodiment 3

[0033] Example 3: Leptospirillum ferriphilum (CCTCC AB 206239) was selected as the leaching bacteria to artificially mix chalcopyrite and bornite pure minerals.

[0034] Comparison index: after leaching for 30 days, the leaching rate of chalcopyrite alone is 35%, and that of bornite is 48%. Mineral samples are ground first until the content of -0.074mm reaches more than 80%, and chalcopyrite and bornite are controlled The mass ratio is 5:1-1:5; the stirring speed of the leaching process is controlled at 100-600rpm, the pH value of the leaching process is controlled at 1.5-2.5, and the solution potential is controlled at 350-480mV (Ag / AgCl is the reference electrode ), the Cu leaching rate is higher than that of chalcopyrite and bornite alone, and the highest Cu leaching rate exceeds 95%. (See Figure 4 )

[0035] In summary, the present invention significantly strengthens the bioleaching of chalcopyrite and bornite.

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Abstract

The invention provides a method for strengthening biological leaching of chalcopyrite and bornite. One or more of acidithiobacillus ferrooxidans, acidithiobacillus caldus and leptospirillum ferriphilum are used as mineral leaching microorganisms. The ratio of the chalcopyrite to the bornite is controlled to be 5:1-1:5. In the leaching process, the stirring speed is controlled to be 100-600 rpm. The pH value of a solution is controlled to be 1.5-2.5, the electric potential of the solution is 350-480 mV (Ag / AgCl is a reference electrode), the chalcopyrite and the bornite can be leached in a cooperative mode, and the Cu leaching rate is obviously increased. According to the method, through reasonable ore blending of the chalcopyrite and the bornite, proper leaching technological conditions are controlled, and the biological leaching efficiency of the chalcopyrite and the bornite is improved. The method is efficient, simple and easy to operate.

Description

technical field [0001] The invention relates to a biological leaching method for strengthening chalcopyrite and bornite, belonging to the technical field of biological hydrometallurgy. Background technique [0002] my country's current dependence on foreign copper metal is as high as 75%-80%, and the proven copper resources are seriously insufficient. With the development of the world economy, high-grade copper ore resources are consumed in large quantities, and copper ore resources tend to be diluted, low-grade, and difficult to handle. Traditional techniques cannot effectively and economically utilize this part of the resources. With its unique advantages, microbial metallurgy has become an important frontier technology for efficient and economical development and utilization of this part of resources. At present, the targets of copper biohydrometallurgy industry are mostly secondary copper sulfide ores dominated by chalcopyrite, while the most abundant copper reserves on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 王军赵红波胡明皓覃文庆陶浪甘晓文郑细华李旖旎邱潇何万里胡岳华姜涛邱冠周
Owner CENT SOUTH UNIV
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