Method for leaching low-grade phosphate ore from ferrous oxide thiobacillus

A low-grade technology of Thiobacillus ferrooxidans, applied in the direction of microorganism-based methods, biochemical equipment and methods, bacteria, etc., can solve the problem that the leaching period is as long as one month or even several months, pyrite has not been comprehensively utilized, Problems such as low resource utilization rate, to achieve the effect of environmentally friendly acidic bacteria liquid, conducive to recycling and efficient utilization, and high resource utilization rate

Inactive Publication Date: 2010-09-22
WESTERN MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the published articles, there are the following disadvantages: the leaching rate of phosphorus is relatively low, mostly between 10% and 60%; the leaching cycle is as long as one month or even several months; 20%, additional phosphorus compounds should be added as the culture medium, the ore particle size is fine, and the pulp concentration is very low; the resource utilization rate is low, such as the pyrite that may be associated with the phosphate rock has not been comprehensively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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 3 5.08, 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%.

[0036] Adopt the method of the present invention to sample, enrich and isolate and domesticate the T.f bacteria that is Thiobacillus ferrooxidans to soak in phosphorus. The technical process conditions of this embodiment are: add 100mL 9K phosphorus-free basic culture solution to a 250mL conical flask, add 1mL of domesticated strains, weigh 0.5g of pyrite and 0.5g of phosphate rock with a particle size of 74 μm to the conical...

Embodiment 2

[0038] Adopt the method of the present invention to sample, enrich and isolate and domesticate the T.f bacteria that is Thiobacillus ferrooxidans to soak in phosphorus. The ore property of present embodiment, mineral composition and the pyrite used are identical with embodiment 1.

[0039] The technical process conditions of this embodiment are: add 100mL9K phosphorus-free basic culture solution to a 250mL conical flask, add 2mL of domesticated strains, weigh 1.0g of pyrite and 1.0g of phosphate rock with a particle size of 150μm into the conical flask In the medium, the initial pH was adjusted to 2.0 with 1:1 sulfuric acid, and cultured in a constant temperature shaker with a temperature of 30°C and a rotation speed of 140r / min, and the phosphorus immersion rate was 77.19% in 28 days.

Embodiment 3

[0041] Adopt the method of the present invention to sample, enrich and isolate and domesticate the T.f bacteria that is Thiobacillus ferrooxidans to soak in phosphorus. The ore property of present embodiment, mineral composition and the pyrite used are identical with embodiment 1.

[0042] The technical process conditions of this embodiment are: add 100mL 9K phosphorus-free basic culture solution to a 250mL conical flask, add 8mL of domesticated bacterial strains, weigh 2.0g of pyrite and 2.0g of phosphate rock with a particle size of 300 μm respectively into the conical flask 1:1 sulfuric acid was used to adjust the initial pH to 2.5, and the temperature was 30°C, and the rotation speed was 140r / min. The constant temperature shaker was cultivated, and the phosphorus immersion rate was 75.77% in 28 days.

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Abstract

The invention relates to the technology of microbial leaching, in particular to a method for leaching low-grade phosphate ore from ferrous oxide thiobacillus obtained by sampling and separating in the acid puddle of Hubei Tonglushan copper ore. The method comprises the following steps: (1) sampling; (2) enrichment and separation and acclimatization of bacterial strains; and (3) phosphate leaching. The method has the advantages that 1. the bacterial strains has high activity and good endurance, and the phosphate leaching rate is high; 2. the cost is low, the cost for making up nutrient solution by a large number of expensive drugs is reduced, and a phosphorus compound does not need to be additionally added to the liquid nutrient medium; 3. the self-associated iron pyrite of the phosphate ore and phosphorus in the phosphate ore are sufficiently used as the energy substances and the nutrients for bacteria growth, which is beneficial to the circulation and the high-efficiency utilization of the associated resources in the phosphate ore; and 4. the method is friendly to the environment: the usage amount of the acid bacterial liquid is low, which is beneficial to reducing environmental pollution.

Description

technical field [0001] The present invention relates to a microbial leaching technology, in particular to a kind of thiobacterium ferrooxidans obtained by sampling, separating, enriching and acclimating from the acidic puddle of Tonglushan Copper Mine in Hubei Province, which is applied to the leaching of low-grade phosphate ore. A method for leaching low-grade phosphate rocks by Thiobacillus ferroides. Background technique [0002] Phosphorus is an important chemical raw material and an essential element for crop growth. As an important producer and consumer of phosphate rock in the world, domestic demand for phosphate rock has been growing. my country's high-grade rich phosphate rock can only meet domestic demand until 2013. Although my country's phosphate rock reserves are relatively large, there are many lean ores and few rich ores. More than 80% of them are medium and low-grade ores. P 2 o 5 The average content is about 17%, and contains more harmful impurities. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C12N1/20C12R1/01
CPCY02P10/20
Inventor 林大泽吕早生张永德吴敏李凌凌袁向利黄秋香
Owner WESTERN MINING CO LTD
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