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›› 2007, Vol. 7 ›› Issue (2): 310-316.

• 过程与工艺 • 上一篇    下一篇

A Novel Approach to Bioleach Soluble Phosphorus from Rock Phosphate

池汝安,肖春桥,黄晓慧,王存文,吴元欣   

  1. 武汉工程大学 湖北省新型反应器与绿色化学工艺重点实验室
  • 出版日期:2007-04-20 发布日期:2007-04-20

A Novel Approach to Bioleach Soluble Phosphorus from Rock Phosphate

CHI Ru-an,XIAO Chun-qiao,HUANG Xiao-hui,WANG Cun-wen,WU Yuan-xin   

  1. Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology，Wuhan Institute of Technology
  • Online:2007-04-20 Published:2007-04-20

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摘要： A novel approach to bioleach soluble phosphorus from rock phosphate, involving the bio-oxidation of pyrite by adaptated Acidithiobacillus ferrooxidans (At. f) and the product of sulfuric acid to dissolve rock phosphate, has been proposed in this paper. The soluble phosphorus could be leached more effectively in the presence of pyrite by At. f than that leached directly by sulfuric acid. The optimal technological parameters are presented. The highest phosphorus leaching rate is 9.00% when the culture substrate is the mixture of FeSO4·7H2O and pyrite, the phosphorus leaching rate is 8.00% when the initial pH and culture time are 2.5 and 5 d, respectively. The optimal rock phosphate particle size is 0.05 mm for the leaching of phosphorus. The bigger the grains of pyrite, the lower the phosphorus leaching rate. The bacterium At. f should be appropriately adaptated, which makes it easier to bioleach soluble phosphorus from rock phosphate.

关键词: bioleach, soluble phosphorus, rock phosphate, pyrite, Acidithiobacillus ferrooxidans

Abstract: A novel approach to bioleach soluble phosphorus from rock phosphate, involving the bio-oxidation of pyrite by adaptated Acidithiobacillus ferrooxidans (At. f) and the product of sulfuric acid to dissolve rock phosphate, has been proposed in this paper. The soluble phosphorus could be leached more effectively in the presence of pyrite by At. f than that leached directly by sulfuric acid. The optimal technological parameters are presented. The highest phosphorus leaching rate is 9.00% when the culture substrate is the mixture of FeSO4·7H2O and pyrite, the phosphorus leaching rate is 8.00% when the initial pH and culture time are 2.5 and 5 d, respectively. The optimal rock phosphate particle size is 0.05 mm for the leaching of phosphorus. The bigger the grains of pyrite, the lower the phosphorus leaching rate. The bacterium At. f should be appropriately adaptated, which makes it easier to bioleach soluble phosphorus from rock phosphate.

Key words: bioleach, soluble phosphorus, rock phosphate, pyrite, Acidithiobacillus ferrooxidans