Inorganic Chemicals Industry >
Study on phosphorus extraction and impurity reduction technology for pretreatment of middle-low grade phosphate ore
Received date: 2019-10-14
Online published: 2020-04-22
In view of the problem that middle-low grade phosphate ore can not be directly processed and the composition charac-teristics of Jinning phosphate ore in Yunnan Province,YP collectors were used to desilicate the raw ore by positive flotation,and then concentrated wet-process phosphoric acid and nitric acid were used to magnisium removal of the phosphate ore after desilication.The orthogonal experiment results showed that when nitric acid was used as pretreatment agent,the optimum conditions for magnesium removal were liquid-solid ratio of 4,pH of 2.5,temperature of 60 ℃,and reaction time of 4 h.Under these conditions,magnesium-phosphorus ratio（Mass fraction ratio of MgO to P2O5） of concentrate was 2.16% and phosphorus loss rate was 1.7%.When wet-process phosphoric acid was used as pretreatment agent,the optimum conditions for magnesium removal were pH of 2.5,liquid-solid mass ratio of 3,reaction time of 2 h and temperature of 50 ℃.The magnesium-phosphorus ratio of concentrate was 3.32%,and the phosphorus loss rate was 0.3%.At the same time,the experimental data were fitted and analyzed,and the dynamic model of the core index of dry magnesium-phosphorus ratio was obtained.The study provided a new idea and reference value for the effective utilization of high silicon middle-low grade phosphate rock in China.
Jieen Li , Binbin He , Xiushan Yang , Dehua Xu , Zhiye Zhang . Study on phosphorus extraction and impurity reduction technology for pretreatment of middle-low grade phosphate ore[J]. Inorganic Chemicals Industry, 2020 , 52(4) : 33 -36 . DOI: 10.11962/1006-4990.2019-0335
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