Extraction of Phosphorus and Potassium by acid from a complex Phosphoric Mineral

Lv Li; Tang Shengwei; Luo Hongbo; Hu Xiaowei; Zhang Guoquan

doi:10.3969/j.issn.1000-6532.2018.01.014

2018 No. 1

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Lv Li, Tang Shengwei, Luo Hongbo, Hu Xiaowei, Zhang Guoquan. Extraction of Phosphorus and Potassium by acid from a complex Phosphoric Mineral[J]. Multipurpose Utilization of Mineral Resources, 2018, (1): 66-69,54. doi: 10.3969/j.issn.1000-6532.2018.01.014

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Lv Li, Tang Shengwei, Luo Hongbo, Hu Xiaowei, Zhang Guoquan. Extraction of Phosphorus and Potassium by acid from a complex Phosphoric Mineral[J]. Multipurpose Utilization of Mineral Resources, 2018, (1): 66-69,54. doi: 10.3969/j.issn.1000-6532.2018.01.014

Extraction of Phosphorus and Potassium by acid from a complex Phosphoric Mineral

Publish Date: 01 February 2018

Abstract

Abstract

The process of separating P2O5 and K2O by sulfuric acid leaching roasted phosphate was proposed to prepare compound fertilizers.The effect of stirring speed,H2SO4 concentration,particle size and reaction temperature on the leaching process was researched.The results indicate that when the concentration of sulfuric acid is 5%,the crystallinity of acid hydrolysate CaSO4 was not complete;with the concentration of sulfuric acid increasing,the whiskers of CaSO4 gradually grow and become thicker;when the sulfuric acid concentration is 30%,the original coarse CaSO4 whiskers are broken and shortened.Meanwhile,the chemical composition of the roasted slag in different particle size is various.When the particle size is larger than 325 μm,the content of P2O5 is 8.39%,while that of 75 pm or less is only 2.99%.In the condition of 20% sulfuric acid concentration,200 rpm,60 min,80℃,both the leaching rate of P2O5 and K2O can reach 90%.

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