Method for promoting biological column leaching of poor chalcocite

A chalcocite, biological technology, applied in the field of bioengineering, can solve the problems of complex operation, high cost, unsuitable for large-scale promotion and application, etc.

Active Publication Date: 2020-03-06
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing reports, the method of exogenous regulation and enhancement of bioleaching is generally complicated to operate, and the cost is high, which is not suitable for large-scale application.

Method used

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  • Method for promoting biological column leaching of poor chalcocite
  • Method for promoting biological column leaching of poor chalcocite
  • Method for promoting biological column leaching of poor chalcocite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of embodiment 1 chalcocite biocolumn leaching solution

[0025] 9K complex medium consists of three parts: the first part is 9K medium, containing (NH 4 ) 2 SO 4 3g, KCl 0.1g, K 2 HPO 4 0.5g, MgSO 4 ·7H 2 O 0.5g, Ca(NO 3 ) 2 0.01g, H 2 O 1000mL; Part II: 10% (w / v) acid mine drainage (AMD) from the Zijinshan mining area (references: Liu X, Chen B, Chen J, etal. Biogeographical distribution of acidophiles and their effects around the Zijinshan heap bioleaching plant[J]. Chemistry and Ecology,2016:1-13.); Part III: 2% (w / v) depleted chalcocite.

[0026] After the first part was mixed, it was sterilized by high pressure steam at 121° C. for 20 minutes, and the pH was adjusted to 2.0 after sterilization. The chalcocite ore samples were taken from the Zijinshan mining area in Fujian. After being crushed and ground, they were screened and filtered to make the ore particle size about <48 μm. The second part is the acid mine drainage (AMD) retrieved...

Embodiment 2

[0027] Example 2 Exogenous compound sulfur oxidizing bacteria agent strengthens chalcocite leaching

[0028] Enhance chalcocite bioleaching by adding exogenous sulfur oxidizing bacteria, such as figure 1 As shown, the control group without exogenous bacterial agents and the addition of acidophilic Thiobacillus thiooxidans (A.t), thermophilic Thiobacillus (A.c) and acidophilus Thiobacillus thiooxidans + thermophilic Thiobacillus (compound sulfur oxidizing bacteria , A.t+A.c) of the experimental group, the leaching rates of copper ions after leaching for 45 days were 17.7%, 20.3%, 19.2% and 21.2%, respectively. Among them, the leaching effect of the experimental group added with A.t+A.c dual bacteria was the best, and the copper ion leaching rate increased by 19.8% compared with the control group.

[0029]The results show that the experimental group added with exogenous compound sulfur oxidizing bacteria agent has stronger copper ion leaching ability and can promote ore dissolu...

Embodiment 3

[0030] Example 3 Based on the ratio of pyrite to intervene and strengthen the iron-sulfur metabolism in the process of bio-column leaching of lean chalcocite

[0031] The morphology of the slag surface after chalcocite biocolumn leaching under different leaching conditions was observed by scanning electron microscope. from figure 2 a It can be seen that under the condition of no external intervention in the leaching process, the surface of the slag after leaching is relatively smooth without obvious corrosion marks, but some derivatives similar to elemental sulfur particles were found, implying that the biochemical reaction in the leaching process is not active . When pyrite is added externally and chalcocite:pyrite=6:1 (w / w), from figure 2 In b, it can be seen that there are obvious corrosion marks on the surface of the slag after leaching, indicating that the addition of pyrite enhances the iron metabolism in the leaching process and strengthens the relevant biochemical ...

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Abstract

The invention discloses a method for promoting biological column leaching of poor chalcocite, particularly discloses a method for synergistically promoting biological column leaching of the poor chalcocite based on foreign intervention of compound sulfur oxidizing bacteria and the pyrite, and belongs to the technical field of bioengineering. 9K-chalcocite composite medium is used as a leaching solution, by adding a certain proportion of the pyrite and introducing a foreign compound sulfur oxidizing bacteria, various biochemical reactions in the leaching process are controlled, iron and sulfurmetabolism are promoted in the leaching process, and formation of an iron/sulfur passivation film is reduced; and the biological effect in the leaching process is strengthened by adding the compound sulfur oxidizing bacteria in batches, so as to make the copper ions leaching rate increase by 33.9%. The method is easy and convenient to operate, economical and reasonable, and is suitable for large-scale application of similar bioleaching processes.

Description

technical field [0001] The invention relates to a method for promoting biological column leaching of poor chalcocite, in particular to a method for synergistically promoting biological column leaching of poor chalcocite based on compound sulfur oxidizing bacteria and pyrite exogenous intervention, and belongs to the field of biological engineering. Background technique [0002] Most of chalcocite is a secondary mineral formed by oxidation and decomposition of primary sulfides and then reduced. It contains high copper content and is the most important ore for copper smelting. my country is rich in chalcocite reserves, and there are a large amount of chalcocite in Dongchuan, Yunnan and Zijin Copper Mine, Fujian. However, with the development of the national economy, high-grade ores are exhausted, and my country's demand for copper is still increasing, making the supply of copper raw materials a "bottleneck" that restricts the development of the copper industry. Therefore, effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00C22B3/18
CPCY02P10/20
Inventor 冯守帅杨海麟尹宗伟洪娴静胡文波侯少翔龚良琪尹伊君
Owner JIANGNAN UNIV
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