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Pyrite selectivity inhibition technique for secondary copper sulfide mineral biological lixiviation process

A copper sulfide ore bioleaching technology, applied in the direction of microorganisms, microorganisms, process efficiency improvement, etc., can solve problems such as hindering the smooth progress of the leaching process, copper recovery rate decline, copper extraction and electrowinning efficiency reduction, etc.

Active Publication Date: 2008-06-04
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology

Excessive iron concentration and excessive acid in the leach solution will not only affect the bacterial activity, hinder the smooth progress of the leaching process, and affect the leaching effect of copper, but also adversely affect the subsequent extraction process, which will bring copper extraction and electrodeposition. A series of problems such as reduced efficiency, reduced copper recovery rate, and high energy consumption

Method used

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  • Pyrite selectivity inhibition technique for secondary copper sulfide mineral biological lixiviation process

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Embodiment Construction

[0032] Such as figure 1 As shown, 1 is the crushing process of low-grade secondary copper sulfide ore; the crushed ore is sent to the ore stacking and pretreatment process; 2; in the pretreatment process, 10-15% of the ore weight is added to the bacteria-containing raffinate, After the ore stacking and pretreatment process, the leaching bacteria obtained by step 9 multiplying and acclimating are added to the leaching step 3. The leachate of step 3 enters the extraction step 4, and the raffinate in step 4 is passed through the step 7 After the adjustment of high iron precipitation and pH value and the potential and temperature adjustment of step 8, return to the leaching step 3 for selective leaching of copper. The copper-containing organic phase extracted in step 4 is sent to the back extraction step 5 for back extraction, after the back extraction The copper-containing rich liquid enters the electrowinning step 6 to obtain electrowinning copper.

[0033] The present invention wil...

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Abstract

The invention relates to a pyrite selective inhabitation technique for biological leaching process of secondary copper sulphide ores, wherein, a biological leaching system with low PH value and low electric potential is reached by utilization of leaching bacteria containing Thiobacillus ferrooxidans Retech III (T.F.R.III leaching bacteria for short) (has been collected in China Center for Type Culture Collection (in Wuhan University) and has a collection registration number of CCTCC No:M200033) and adoption of two spraying methods of phased intermission and continuity and reasonable matching of bacterial activity, PH value and other conditions, and high efficiency selective leaching of the copper sulphide ores is realized. Moreover, pyrites are inhibited effectively and yield of acids and irons is reduced. After extraction of qualified lixivium after leaching, aqueous phase goes back for heap leaching, and organic phase enters into stripping procedure for treatment. The invention has the advantages of short technological flow, simple equipment, low cost, no pollution, high recovery rate, capability of processing low-grade secondary copper sulphide ore resources which are difficult to process by the prior mineral smelting technique, and improvement of comprehensive utilization rate of copper resources.

Description

Technical field [0001] The invention relates to a selective inhibition leaching process of pyrite during the leaching process of low-grade secondary copper sulfide ore, in particular to a process of using microorganisms to oxidize copper sulfide ore under a low-pH and low-potential biological leaching system , While not affecting the leaching effect of copper minerals, it effectively inhibits the excessive leaching of pyrite and avoids the process of causing excess acid and iron in the biological heap leaching process. Background technique [0002] With the continuous development and utilization of mineral resources, high-grade, easy-to-treat ores continue to decrease, mineral resources are becoming increasingly poor and complex, environmental protection pressure is increasing, and traditional metallurgical processes are facing challenges. Although low-grade mineral resources at home and abroad have been widely used in biological copper extraction technology, they are all limited...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/26C22B1/14C22B15/00C12N1/00
CPCY02P10/20
Inventor 阮仁满温建康周桂英
Owner 有研资源环境技术研究院(北京)有限公司
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