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Process for leaching copper oxide ore by alkaline bacterium

A copper oxide ore leaching technology, applied in the field of leaching mining, can solve the problems of poor permeability, high cost, high acid consumption, etc., and achieve the effect of low cost, small investment and low equipment requirements

Inactive Publication Date: 2014-11-19
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to use bacteria to leach copper oxide ore under alkaline conditions, solve the problems of high acid consumption, poor permeability, and high cost in the acid leaching process, enrich the bacterial leaching process of copper ore, and make the bacterial leaching of copper ore Extend from acidic leaching process to alkaline leaching process

Method used

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  • Process for leaching copper oxide ore by alkaline bacterium
  • Process for leaching copper oxide ore by alkaline bacterium
  • Process for leaching copper oxide ore by alkaline bacterium

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Taking heap leaching as an example to illustrate the specific implementation method of this new process, the process flow is as follows figure 2 shown.

[0021] Step 1: Preparation for leaching

[0022] A domestic copper mine is a copper oxide mine with high alkaline gangue content, the oxidation rate of the copper mine is 35%-65%, and the copper grade of the ore is 0.9-1.3%. The ore is crushed so that the maximum particle size of the ore does not exceed 50mm. Lay the anti-seepage pad in the storage yard, and lay the leachate circulation pipeline system at the same time. The area of ​​the ore heap is 800m×150m, and the height of the ore heap is 2-5m.

[0023] The alkaline bacterium JAT-1 was cultivated on a large scale under the condition of pH=9 by using a bacterial fermenter, and the changes of the bacterial concentration and the pH of the bacterial solution were monitored during the cultivation process. When the bacterial concentration reached 1×10 7 ~1×10 8 p...

Embodiment 2

[0030] Taking stirring leaching as an example to illustrate the specific implementation method of this new process, the process flow is as follows image 3 shown.

[0031] Step 1: Preparation for leaching

[0032] The oxidation rate of high-alkaline gangue copper oxide ore is 35% to 65%, and the ore copper grade is 0.8% to 1.3%. The copper oxide ore is mainly malachite and chrysocolla, followed by azurite. The ore is crushed and ground to make the ore particle size +200 mesh content reach more than 80%, while -200 mesh content is less than 20%.

[0033] Use a bacterial fermenter to cultivate alkaline bacteria JAT-1 on a large scale under the condition of pH=9, monitor the changes in bacterial concentration and pH value of the bacterial solution during the bacterial growth process, and wait until the bacterial concentration reaches 1×10 8 ~1×10 9 pcs / ml, take bacterial liquid and mix with liquid culture medium to make leaching agent. The ratio of bacterial liquid to liquid ...

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Abstract

The invention discloses a process for leaching a copper oxide ore by bacterium, and belongs to the field of solution mining. Alkaline bacterium generates ammonia which is used for the complex reaction with a copper ore to realize the leaching of the copper oxide ore under the alkaline condition. The alkaline bacterium for ore leaching is JAT-1; the optimal growth pH is 8.0-11.0; and urea can be decomposed in the metabolic process to generate ammonia. Leachate is prepared by mixing bacterium liquid with a liquid medium in proportion; and the ratio of the bacterium liquid to the liquid medium is 1:10-1:5. The leaching process belongs to the alkaline method leaching, can be realized by dump leaching or agitation leaching, can economically and effectively treat the copper oxide ore, and particularly can treat the refractory copper oxide ore with high content of basic gangue. Compared with the acid leaching, the process prevents such problems as high acid consumption, weak permeability and high cost in an acid leaching system; and compared with ammonia leaching, the process can treat the ore on a large scale under the natural condition, and has the advantages of low investment, low cost and less environmental pollution.

Description

technical field [0001] The invention belongs to the field of leaching mining, and relates to a process for leaching copper oxide ore under alkaline conditions by using bacteria. Background technique [0002] In the field of leaching mining, a lot of research has been done on the copper leaching process by acid method and acidophilic bacteria copper leaching process, and they have good application effect in industrial production. However, for refractory copper oxide ores and copper tailings containing high alkaline gangue minerals, there are many problems in acid leaching or acidophilic bacteria leaching: on the one hand, a large amount of alkaline gangue minerals will inevitably increase the acid consumption, Economically unreasonable; on the other hand, a large amount of slightly soluble substances such as calcium sulfate and magnesium sulfate will be produced in the acidic system, which will greatly reduce the permeability of the leaching system, thereby affecting the leac...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 王洪江胡凯建李广泽吴爱祥王贻明韩斌
Owner UNIV OF SCI & TECH BEIJING
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