Heap bioleaching method for secondary copper sulfide ore

A technology of copper sulfide ore and biopile, applied in the direction of improving process efficiency, etc., can solve the problem of inability to take into account efficient leaching of copper and inhibition of pyrite oxidation, pyrite oxidation cannot be effectively controlled, and no mention of oxidation control Reduce the concentration of reduction potential and other issues, achieve the effect of reducing the cost of neutralization of wastewater and the amount of neutralization slag, good prospects for popularization and application, and low oxidation rate of pyrite

Active Publication Date: 2017-10-20
ZIJIN MINING GROUP
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Problems solved by technology

my country's first 10,000-ton biological copper extraction mine was put into production at Zijinshan Copper Mine at the end of 2005. This method makes full use of low-grade resources that are difficult to use by traditional techniques and obtains good economic benefits. During the process, the oxidation of pyrite in the ore has not been effectively controlled, which gradually increases the leaching amount of acid and iron, resulting in an increasing cost of environmental protection and neutralization
[0004] Among the above four patent documents, the first three did not fully consider the leaching characteristics of secondary copper sulfide ore, and the entire leaching process adopts the same control process, which cannot take into account the efficient leaching of copper and the inhibition of pyrite oxidation; in addition, the first two patents The literature must periodically add special bacteria solution, and the raffinate of the first patent needs to be neutralized with limestone and lime before returning to spraying, all o...

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  • Heap bioleaching method for secondary copper sulfide ore

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Comparison scheme
Effect test

Embodiment 1

[0028] The copper grade in a certain secondary copper sulfide ore is 0.40%, and the copper minerals are mainly chalcocite and copper blue, containing a small amount of refractory copper minerals, such as pyrite, etc.; the content of pyrite is relatively high (4%-8 %), copper minerals and pyrite are closely symbiotic; gangue minerals are mainly quartz, and the content of acid-consuming gangue is low. The operation steps are as follows:

[0029] When the copper ore is crushed to -50mm ≥ 85%, use a truck to build a pile with a height of 10 meters; after the ore is piled up, immediately use the acidic wastewater from the mine to spray the ore to spread bacteria, and weld the spray pipe at the same time; After the welding is completed, use the raffinate (sulfuric acid concentration 8g / L, total iron concentration 8g / L, oxidation-reduction potential 750mV) for the first stage of continuous spraying, and the spraying intensity is 35L / h m 2 After the copper leaching rate reaches 50%, ...

Embodiment 2

[0032] The copper grade in a certain secondary copper sulfide ore is 0.40%, and the copper minerals are mainly chalcocite and copper blue, containing a small amount of refractory copper minerals, such as pyrite, etc.; the content of pyrite is relatively high (4%-8 %), copper minerals and pyrite are closely symbiotic; gangue minerals are mainly quartz, and the content of acid-consuming gangue is low. The operation steps are as follows:

[0033] After the copper ore is crushed to -40mm ≥ 85%, the truck is used to build a pile with a height of 12 meters; after the ore is piled up, the ore is immediately sprayed with acidic wastewater from the mine to spread bacteria, and the spray pipe is welded at the same time; the spray pipe is welded After completion, use raffinate (sulfuric acid concentration 12g / L, total iron concentration 12g / L, redox potential 760mV) for the first stage of continuous spraying, spraying intensity 40L / h m 2 After the copper leaching rate reaches 50%, carry...

Embodiment 3

[0036] The copper grade in a certain secondary copper sulfide ore is 0.40%, and the copper minerals are mainly chalcocite and copper blue, containing a small amount of refractory copper minerals, such as pyrite, etc.; the content of pyrite is relatively high (4%-8 %), copper minerals and pyrite are closely symbiotic; gangue minerals are mainly quartz, and the content of acid-consuming gangue is low. The operation steps are as follows:

[0037] When the copper ore is crushed to -50mm ≥ 85%, use a truck to build a pile with a height of 10 meters; after the ore is piled up, immediately use the raffinate (sulfuric acid concentration 8g / L, total iron concentration 8g / L, 750mV) spray wet ore, spread bacteria, and weld the spray pipe at the same time; after the spray pipe is welded, use the raffinate (sulfuric acid concentration 12g / L, total iron concentration 12g / L, redox potential 760mV) for the first stage Continuous spraying, spraying intensity 40L / h m 2 After the copper leachi...

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Abstract

The invention discloses a heap bioleaching method for secondary copper sulfide ore. The heap bioleaching method for the secondary copper sulfide ore comprises the steps that after the secondary copper sulfide ore is heaped, mine acid waste water or raffinate is used for spray wetting and fungus distribution, so that microorganisms are made to grow rapidly on the surface of the ore, and rapid leaching of the secondary copper sulfide ore is achieved; and afterwards, the leaching process is conducted by two stages, specifically, in the first stage, the raffinate obtained after leach liquor is extracted is used for continuous spraying, the acid concentration is controlled to 5-15 g/L, the total iron concentration is controlled to 5-15 g/L, and the oxidation reduction potential does not need to be controlled particularly; and the second stage is started when the copper leaching rate reaches 45%-50%, the mine acid waste water or the mixed liquor of the mine acid waste water and the raffinate is used for intermittent spraying in the second stage of the leaching process, the acid concentration is controlled to 3-6 g/L, the total iron concentration is controlled to 3-6 g/L, and the oxidation reduction potential is controlled to 600-700 mV. By adoption of the heap bioleaching method for the secondary copper sulfide ore, oxidation of iron pyrite can be effectively restrained while efficient leaching of copper is achieved, technological parameters can be controlled easily, the production cost is low, and the economic benefit and the environment benefit are remarkable.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for biological heap leaching of secondary copper sulfide ores. Background technique [0002] The "biological heap leaching-extraction-electrodeposition" process has significant advantages such as low cost and low energy consumption, and has become the preferred process for low-grade secondary copper sulfide ores. At present, nearly 20 mines around the world use this process. my country's first 10,000-ton biological copper extraction mine was put into production at Zijinshan Copper Mine at the end of 2005. This method makes full use of low-grade resources that are difficult to use by traditional techniques and obtains good economic benefits. During the process, the oxidation of pyrite in the ore has not been effectively controlled, which gradually increases the leaching amount of acid and iron, resulting in an increasing cost of environmental protection and neutralization. ...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0067Y02P10/20
Inventor 蓝碧波王春黄怀国张兴勋赖晓康王滔何美丽江全秀陈聪罗增鑫刘涛
Owner ZIJIN MINING GROUP
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