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Extraction and Reaction Mechanism of Potassium from Associated Phosphorus and Potassium Ore

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【作者】 李亮雷绍民LIU YuanyuanLUO Huihua

【Author】 LI Liang;LEI Shaomin;LIU Yuanyuan;LUO Huihua;School of Resources and Environmental Engineering,Wuhan University of Technology;School of Chemistry and Environmental Engineering,Wuhan Institute of Technology;

【机构】 School of Resources and Environmental Engineering,Wuhan University of TechnologySchool of Chemistry and Environmental Engineering,Wuhan Institute of Technology

【摘要】 Potassium and phosphate were extracted at low temperature by acid hydrolysis process to decompose a new type of associated phosphorus and potassium ore. The main factors affecting the dissolution rate were investigated, such as grinding fineness, the amount of sulfuric acid and fluoride salt, reaction time and temperature, etc. Meanwhile, the effects of various factors on the formation of soluble potassium and phosphate were also discussed. The reaction products and residues were determined by X-ray diffraction(XRD), scanning electron microscopic(SEM) analysis and other means. The results showed that the dissolution rates of potassium and phosphorus were 70wt% and 93.7wt%, respectively, under the conditions of a grain size of 95.64wt% lessthan 0.074 mm, 9.78 g·g-1 sulfuric acid, 0.5 g·g-1 ammonium fluoride, 160 ℃ and a reaction time of 2h. The thermodynamic and chemical reaction mechanism was revealed that the primary reaction could be completed spontaneously in a temperature range of 298-433 K. The increase of reaction temperature had an important influence on ion exchange reaction, which was more conducive to the spontaneous process. The research will open up a new way for efficient use of potassium ore resources.

【Abstract】 Potassium and phosphate were extracted at low temperature by acid hydrolysis process to decompose a new type of associated phosphorus and potassium ore. The main factors affecting the dissolution rate were investigated, such as grinding fineness, the amount of sulfuric acid and fluoride salt, reaction time and temperature, etc. Meanwhile, the effects of various factors on the formation of soluble potassium and phosphate were also discussed. The reaction products and residues were determined by X-ray diffraction(XRD), scanning electron microscopic(SEM) analysis and other means. The results showed that the dissolution rates of potassium and phosphorus were 70wt% and 93.7wt%, respectively, under the conditions of a grain size of 95.64wt% lessthan 0.074 mm, 9.78 g·g-1 sulfuric acid, 0.5 g·g-1 ammonium fluoride, 160 ℃ and a reaction time of 2h. The thermodynamic and chemical reaction mechanism was revealed that the primary reaction could be completed spontaneously in a temperature range of 298-433 K. The increase of reaction temperature had an important influence on ion exchange reaction, which was more conducive to the spontaneous process. The research will open up a new way for efficient use of potassium ore resources.

【基金】 Funded by the National Natural Science Fundation of China(51274158);the National Twelfth Five-Year Plan for Scientific and Technological Support(2013BAE04B03);the Scientific and Technological Support Project of Hubei Province(2015BCA251)
  • 【文献出处】 Journal of Wuhan University of Technology(Materials Science) ,武汉理工大学学报(材料科学版)(英文版) , 编辑部邮箱 ,2016年06期
  • 【分类号】TF826.1
  • 【被引频次】2
  • 【下载频次】34
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