Inorganic Chemicals Industry >
Leaching process and kinetics of phosphorus-potassium ore decomposition by nitric acid
Received date: 2022-06-30
Online published: 2023-05-15
In order to solve the problem that it is difficult to achieve industrial scale continuous production of phosphorous-potassium ore by wet phosphoric acid process，a new technology of processing phosphorus-potassium ore by nitric acid method was investigated.The effects of reaction temperature，liquid-solid mass ratio，nitric acid concentration and particle fineness on phosphorus leaching rate of phosphorus-potassium associated ore by nitric acid leaching were studied.The results showed that the leaching rate of phosphorus was increased with the increase of reaction temperature，liquid-solid mass ratio，nitric acid concentration，and decreased with the increase of phosphoric acid concentration and particle size.Under the optimized conditions of temperature of 50 ℃，liquid-solid mass ratio of 7.3∶1，nitric acid concentration of 40% and reaction time of 1 h，the leaching rates of phosphorus and potassium were 96.62% and 2.45%，respectively，realizing efficient leaching of phosphorus and separation of phosphorus and potassium elements.The kinetic analysis showed that the leaching of phosphorus was belonged to solid product layer diffusion control，and the activation energy was 4.77 kJ/mol.The research results could provide a new idea for the utilization of phosphorus-potassium ore.
Key words： phosphorus-potassium ore; nitric acid; kinetic; potassium feldspar
WANG Haosen , REN Bingchen , XU Dehua , YANG Xiushan , ZHANG Zhiye . Leaching process and kinetics of phosphorus-potassium ore decomposition by nitric acid[J]. Inorganic Chemicals Industry, 2023 , 55(5) : 45 -51 . DOI: 10.19964/j.issn.1000-4990.2022-0395
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