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A method for treating tailings with high content of fine particles based on bio-thin layer heaping

A thin-layer and stacking technology, which is applied in the field of high-containing fine-grained tailings based on biological thin-layered stacking and biological thin-layered stacking, can solve the problems of bioleaching of fine-grained tailings and other problems, so as to improve bioleaching efficiency, The effect of uniform seepage and broad application prospects

Active Publication Date: 2017-11-07
CENT SOUTH UNIV
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Problems solved by technology

[0004] In view of the defects existing in the prior art, the object of the present invention is to provide a method for realizing efficient leaching of copper in copper tailings by constructing a biological thin-layer heap with uniform gas-liquid seepage and good microbial growth. Simple and low cost, it can solve the problem of biological leaching of fine-grained tailings that is difficult to solve by the traditional heap leaching process, especially suitable for biological wet treatment of high-content fine-grained copper tailings and lean ore, and has broad application prospects in the field of metallurgy

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  • A method for treating tailings with high content of fine particles based on bio-thin layer heaping
  • A method for treating tailings with high content of fine particles based on bio-thin layer heaping
  • A method for treating tailings with high content of fine particles based on bio-thin layer heaping

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Embodiment 1

[0042] The copper flotation tailings come from the Lualo tailings pond in Zambia, with a copper grade of 0.19%. Tailings particle size distribution (w / w) is: tailings smaller than 75 μm accounted for 48%, and tailings of 75-150 μm accounted for 52%. The phase distribution of copper in the tailings is (w / w): 35.26% primary copper sulfide, 28.95% secondary copper sulfide, 29.47% free copper oxide, and 6.32% combined copper oxide. The lump ore used comes from Dexing Copper Mine in Jiangxi, with a copper grade of 0.58%, iron content of 17.50%, and sulfur content of 15.85%.

[0043] Mixed acidophilic microbial flora for thin layer leaching of tailings consists of acidophilic Thiobacillus ferrooxidans, acidophilic Thiobacillus thiooxidans, Leptospira ferrooxidans, mesophilic Sulfobacillus sulfuroxidans, thermoacidophilic ferric Composition of bacteria. Before mixing, various ore leaching microorganisms are cultured separately, and the basic salt medium components include (NH 4 ) ...

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Abstract

The invention discloses a method for disposing fine-grain-containing tailings on the basis of biological lamina heap construction. The method comprises the following steps: by taking a quartz sand layer as a substrate, sequentially paving low-grade copper lump ores and copper tailings cured by a sulfuric acid solution on the substrate to construct multiple tailings-lump ore mixed ore lamellae, so as to form a tailings-lump ore mixed ore stack; spraying the sulfuric acid solution to the top of the mixed ore stack to perform mixed ore pre-oxidation; and then adding mixed acidophilus ore leaching microbial flora to the top of the mixed ore stack to perform bioleaching on copper ore. The tailings-lump ore mixed ore stack is uniform in gas-liquid seepage, thus being beneficial for microbial growth and improving the bioleaching efficiency, and after the leaching period of 120 days, the leaching efficiency of copper in the tailings reaches 57.10%, and the leaching efficiency of copper in the lump ore reaches 65.52%; and the heap construction manner of the ore stack is simple, the cost is low, and the method has wide application prospect in the field of metallurgy.

Description

technical field [0001] The invention relates to a biological thin-layer heaping method, in particular to a method for treating tailings with high content of fine particles based on biological thin-layer heaping; it belongs to the technical field of biological hydrometallurgy. Background technique [0002] With the rapid development of the world economy, the demand for metal resources is increasing rapidly. With the vigorous development of mineral resources, rich ore resources are constantly decreasing, and the contradiction between supply and demand is constantly increasing. At the same time, the use of traditional metallurgical technology to extract useful metals from lean ore, tailings and refractory ores is not only costly, but also seriously pollutes the ecological environment, which cannot meet the environmental protection concept of today's society. In recent years, the leaching of useful metals from low-grade ores by microorganisms, especially the bioheap leaching met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0071Y02P10/20
Inventor 刘学端郝晓东梁伊丽尹华群曾伟民胡琪
Owner CENT SOUTH UNIV
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