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Method for leaching low-grade phosphorite with mixed bacillus of thiobacillus thioxidans and thiobacillus ferrooxidans

A technology of Thiobacillus ferrooxidans and Thiobacillus thiooxidans, which is applied in the field of ore extraction, can solve the problems of long leaching time of ferrous oxide sulfur rods, lack of comprehensive utilization of pyrite, and high cost of culture medium, and achieve environmentally friendly acid bacteria The effect of liquid volume, low cost and high resource utilization

Inactive Publication Date: 2010-11-24
WESTERN MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are a few reports at home and abroad on the leaching of phosphorus in phosphate rock powder by single ferrous sulfur oxidizer and thiobacterium thiooxidans.
From the published articles, there are following disadvantages: the leaching time of ferrous sulfur oxide bar is long, the rate is slow, and the leaching rate is low; Both lack comprehensive utilization of pyrite associated with phosphate rock

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment illustrates the effect of soaking phosphorus when the mixed bacteria ratio v / v is 10%, and At.t:At.f=9:1.

[0041] The ore property of this embodiment is collophosite, containing P 2 o 5 It is 21.98%, which belongs to low grade. The chemical composition and content of other elements in phosphate rock are (wt%): SiO 2 24.94, Fe 2 o 3 2.52, CaO 33.55, MgO 1.27, Al 2 o 35.08, S 1.45, F 2.09, etc.; the main phase composition is (wt%) apatite + collophosite 53.00, pyrite 3.85, carbonaceous 2.50, feldspar + quartz 30.50, in addition, there are calcite, dolomite , carbonaceous clay, etc. TFe38.77% (wt) in pyrite, particle size -200 mesh accounts for 90.2%.

[0042] The method of the invention is used for sampling, enriching, separating and purifying the mixed bacteria composed of Thiobacillus thiooxidans and Thiobacillus ferrooxidans for soaking phosphorus. The process conditions of this embodiment are: in a 250mL conical flask containing 80mL ore lea...

Embodiment 2

[0044] This embodiment illustrates the effect of soaking phosphorus when the mixed bacteria ratio v / v is 10%, and At.t:At.f=8:2.

[0045] The ore property of present embodiment, mineral composition and the pyrite used are identical with embodiment 1.

[0046] The method of the invention is used for sampling, enriching, separating and purifying the mixed bacteria composed of Thiobacillus thiooxidans and Thiobacillus ferrooxidans for soaking phosphorus. The process conditions of this embodiment are: in a 250mL conical flask containing 80mL ore leaching medium, add 1g of sulfur powder, 1.0g of pyrite and 1.0g of phosphate rock with a grinding time of 20min, and use 1+1 Sulfuric acid was used to adjust the initial pH to 2.0. According to the experimental requirements, 8 mL of purified At.t bacteria and 2 mL of At.f bacteria were added, and 0.01 g of surfactant Tween80 was added. Cultivate in a constant temperature shaker with a rotating speed of 150r / min, and the leaching rate is...

Embodiment 3

[0048] This embodiment illustrates the effect of soaking phosphorus when the mixed bacteria ratio v / v is 10%, and At.t:At.f=5:5.

[0049] The ore property of present embodiment, mineral composition and the pyrite used are identical with embodiment 1. Using the method of the invention to sample, enrich, separate and purify the mixed bacteria composed of Thiobacillus thiooxidans and Thiobacillus ferrooxidans for soaking phosphorus. The process conditions of this embodiment are: in a 250mL conical flask containing 80mL ore leaching medium, add 1g of sulfur powder, 1.0g of pyrite and 1.0g of phosphate rock with a grinding time of 20min, and use 1+1 Adjust the initial pH to 1.0 with sulfuric acid, add 5 mL of purified At.t bacteria and 5 mL of At.f bacteria according to the needs of the experiment, add 0.001 g of surfactant Tween80, supplement to 100 mL with ore leaching medium, and set the temperature at 30 Cultivate in a constant temperature shaker with a rotating speed of 150r / ...

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Abstract

The invention relates to an ore extraction technology, in particular to a method for leaching low-grade phosphorite with mixed bacillus, wherein the mixed bacillus consists of a thiobacillus thioxidans At.t which is separated from soil sample of the Hubei tongshankou copper mine and a thiobacillus ferrooxidans At.f which is separated from acid water hole of the Hubei tonglushan copper mine. The method comprises the following steps of: 1) sampling from the soil sample of the Hubei tongshankou copper mine and the acid water hole of the Hubei tonglushan copper mine; 2) separating the thiobacillus thioxidans and the thiobacillus ferrooxidans in an enrichment way and domesticating; and 3) leading the phosphorus. The method has the beneficial effects of: 1. being high in the activity of mixed bacillus: the phosphorus leading rate is high up to 88.75%; 2. being low in cost: the cost of the 10% inoculum size is far lower than that of the 20%-30% inoculum size of the thiobacillus thiooxidans in the prior art, so that the cost for preparing culture solution with plenty of expensive medicaments is reduced; 3. being short in period and high in efficiency; and 4. being environment-friendly: the usage amount of the acid bacillus is small, thereby being good for reducing environment pollution.

Description

technical field [0001] The present invention relates to a kind of ore extracting technology, specifically relate to a kind of A Thiobacillus thiooxidans At. A mixed bacteria composed of Thiobacillus ferrooxidans At.f is applied to the mixed bacteria leaching method of low-grade phosphate rock. Background technique [0002] my country is rich in phosphate rock resources, with a total resource of about 50 billion tons, distributed in 26 provinces. Although my country's phosphate rock resources are abundant, the distribution is too concentrated, and there are many low-grade and medium-grade phosphate rocks and few rich ore. With the development of industrialization, people's demand for raw materials continues to expand, and the high-grade rich ore has been fully developed. We have to use these low-grade, difficult to handle and scattered lean ore resources. At present, the development and utilization of low-grade phosphate rock in my country is relatively lagging behind. With...

Claims

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Application Information

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IPC IPC(8): C01B25/02C12N1/20C12S99/00C12R1/01
Inventor 林大泽吕早生吴敏张永德李凌凌
Owner WESTERN MINING CO LTD
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