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Acidophilic leaching-ore bacteria, heap bioleaching process for low grade phosphate ore by using the same

A low-grade, biological pile technology, applied in the direction of process efficiency improvement, bacteria, etc., can solve the problems of large equipment, huge investment, environmental pollution, etc.

Inactive Publication Date: 2009-05-20
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Claims
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Problems solved by technology

Using the traditional method requires a large amount of sulfuric acid to decompose phosphate rock, which requires large-scale equipment and huge investment, and also causes serious pollution to the environment

Method used

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  • Acidophilic leaching-ore bacteria, heap bioleaching process for low grade phosphate ore by using the same

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Embodiment 1

[0015] The main minerals in the undeveloped middle and low grade phosphate ore in a domestic mine are collophane and dolomite, the minor minerals are chalcedony, hydromica, limonite, and the trace minerals are potash feldspar, barite, organic matter, Sea green stone, cuttings, etc. According to mineral facies analysis and identification, the phosphate rock is in a compact and band-like structure, with micrite structure, sand-oolitic structure, mic-crystal sand structure, sand structure and gravel (breccia) structure common. Its chemical composition is CaO, P 2 O 5 , CO 2 , MgO, SiO 2 , Acid insoluble matter is the main, followed by F, Al 2 O 3 , Fe 2 O 3 , Cl-, I, Cd, As trace distribution. P 2 O 5 , (20.27%), MgO (1.16%), CO 2 (2.89%), CaO (28.97%), F (1.78%), SiO 2 (29.51%), acid insoluble matter (36.55%), Fe 2 O 3 (1.96%), Al 2 O 3 (4.37%). The content of each component is different in different natural types of ore.

[0016] The present invention will be further illustrated be...

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Abstract

The invention relates to acidophilic mineral leaching bacteria and a biological heap leaching technique of middle-grade and low-grade phosphorite that uses the acidophilic leaching bacteria. The acidophilic mineral leaching bacteria is preserved in China Center for Type Culture Collection in Wuhan University and named Thiobacillus ferrooxidans Retech V, the preservation date is October 21st, 2002, and the preservation registration number is CCTCC NO. of M202039. The biological heap leaching technique smashes raw ores and mixes the ores with proper amount of iron pyrites and surface active agent, thus greatly improving phosphorus leaching rate. A leaching liquid with iron removed has the phosphorus (according to P2O5) content more than 30 percent and can be directly used for phosphate fertilizer production. The biological heap leaching technique has short procedure, simple equipment, saved investment, low cost, no pollution, high recycling rate and flexible production scale, can be used for treating the resources of middle-grade and low-grade phosphate rocks which are hard to be treated by traditional picking metallurgy techniques, and can raise the utilization rate of phosphorus resources.

Description

Technical field [0001] The invention relates to an acidophilic ore leaching bacteria and a biological heap leaching process for medium and low-grade phosphate rock, in particular to a process for leaching medium and low-grade phosphate rock by using an acid solution containing exclusive leaching microorganisms. Background technique [0002] The production of phosphate rock resources is the application of phosphate fertilizer to the soil, which can no longer be recycled. And unlike the feature that metal mines can be replaced, phosphate rock resources are related to world food security and human survival and development, and are irreplaceable. Therefore, protecting phosphate rock resources and realizing their sustainable development and utilization are related to world food security. my country's economic development has reached a period of resource consumption, and the consumption of phosphate rock resources has also entered a rapid period. As an important producer and consumer o...

Claims

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Application Information

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IPC IPC(8): C12N1/20C22B3/18
CPCY02P10/20
Inventor 武彪温建康舒荣波周桂英
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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