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Method for leaching phosphorus from low-grade phosphate ore by thiobacillus thiooxidans

A thiobacterium oxidans, low-grade technology, applied in the field of microbial leaching, can solve the problems of long production cycle, months or even years, and slow leaching speed, so as to achieve low production cost, reduce investment cost, The effect of reducing environmental pollution

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

[0008] In short, there are very few studies on the leaching of phosphate rocks using Thiobacillus thiooxidans. Its biggest disadvantage is the long production cycle and slow leaching speed. Heap leaching and in-situ leaching generally take months or even years.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The nature of the ore in this embodiment is collophanite, containing P 2 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 + collophane 53.00, pyrite 3.85, carbon 2.50, feldspar + quartz 30.50, in addition, there are calcite, dolomite , Carbon clay, etc. The TFe in the pyrite is 38.77% (wt), and the particle size is -200 mesh accounting for 90.2%.

[0032] The technical process conditions of this embodiment are: in 100 mL of P-free and sulfur-free Waksman leaching medium, 20 mL of domesticated Thiobacillus oxidans is connected, the initial pH is 1.0, the phosphate rock concentration is 0.5 g, and the particle size is the grinding time For 10 minutes, the pyrite addition amount was 0.5g, the rotation speed was set to 120r / min, and the temperature was 30°C in a constant ...

Embodiment 2

[0034] The ore properties, mineral composition and pyrite used in this example are the same as those in example 1.

[0035] The technical process conditions of this embodiment are: in 100 mL of P-free and sulfur-free Waksman leaching medium, 25 mL of domesticated Thiobacillus oxidans is connected, the initial pH is 2.0, the phosphate rock concentration is 2.0 g, and the particle size is the grinding time 20min, the pyrite was added in 1.0g, and the ore was leached in a constant temperature shaker with a rotation speed of 120r / min and a temperature of 30°C for 7 days, and the phosphorus leaching rate reached 90.71%.

Embodiment 3

[0037] The ore properties, mineral composition and pyrite used in this example are the same as those in example 1.

[0038] The technical conditions of this embodiment are: in 100 mL of P-free and sulfur-free Waksman leaching medium, 30 mL of domesticated Thiobacillus oxidans are connected, pH=2.5, grinding time 15min, phosphate rock concentration is 1.0g / L, The amount of pyrite added was 1.0g, and the phosphorus was soaked in a constant temperature shaker with a temperature of 30°C and a rotating speed of 120r / min for 7 days, and the phosphorus soaking rate was 95.67%.

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Abstract

The invention relates to microbial leaching technology, in particular to a microbial leaching method for low-grade phosphate ore by thiobacillus thiooxidans separated from a copper ore soil sample in Tongshankou in Hubei Province. The method comprises the following steps of: 1) sampling; 2) enrichment, separation and domestication of bacterial strain; and 3) leaching method for phosphorus. The bacterial strain which is obtained by screening and domesticating makes the phosphorus leaching rate over 30 percent higher than that in the conventional reports. By using pyrite as a leaching aid, the leaching method reduces the addition of a great amount of expensive phosphorous compounds and monomer sulfur, is favorable for cycle and high-efficiency utilization of accompanying resources in the phosphorite, reduces the environmental pollution and the investment cost, has lower production cost, and can realize sustainable development of the resource development and environmental protection.

Description

Technical field [0001] The invention relates to a microbial leaching technology, in particular to a strain of Thiobacillus thiooxidans isolated from a soil sample of copper ore in Tongshankou, Hubei, and applied to the microbial leaching of low-grade phosphate rock from low-grade phosphate rock method. Background technique [0002] my country is rich in phosphate resources, with a total resource of about 50 billion tons, distributed in 26 provinces, relatively concentrated in the five provinces of Yunnan, Guizhou, Sichuan, Hubei, and Hunan, accounting for about 4 / 5 of the country's total reserves. The characteristics of my country's phosphate rock resources: (1) The resources are abundant, but the distribution is too concentrated; (2) There are many medium and low-grade phosphate rocks but few rich ores; (3) There are many difficult-to-beneficiation ore and less easy-to-beenable ore; suitable for large-scale and high-intensity mining Less. With the development of industrializati...

Claims

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Application Information

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IPC IPC(8): C01B25/02C12N1/20C12S99/00C12R1/01
Inventor 林大泽吕早生张永德吴敏关海燕李凌凌肖云
Owner WESTERN MINING CO LTD
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