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Study on treatment of medium and low grade high magnesium collophanite by nitric acid method
Received date: 2021-03-19
Online published: 2022-03-14
The optimum conditions for the magnesium removal from medium and low grade high magnesium collophanite were obtained through the orthogonal experiment of five factors and five levels：the liquid-solid ratio was 3.0,the dosage of nitric acid was 0.207 g（calculated as 1g phosphate rock）,the fineness of phosphate rock was 150~180 μm,the temperature was 45 ℃,and the reaction time was 2.5 h.The mathematical model was obtained by regression analysis of the ratio of magnesium to phosphorus pentoxide in phosphorus concentrate.The correlation coefficient of the model was 0.926,which could well pre-dict the result of magnesium removal from high magnesium collophanite.The experiment was repeated under the optimum conditions,and the results showed that the magnesium removal ratio was 96.1%,the phosphorus pentoxide loss ratio was only 0.303%,the ratio of magnesium to phosphorus pentoxide in concentrate was only 0.594%,the P2O5 content in phosphate rock was 31.0%,and the MgO content was only 0.184%,which fully met the requirements of the wet processing of first-class phosphate ores.The research results had important reference and guiding significance for industrial application of medium and low grade high magnesium collophanite.
Yong XIAO , Xiushan YANG , Dehua XU , Xinlong WANG , Zhiye ZHANG . Study on treatment of medium and low grade high magnesium collophanite by nitric acid method[J]. Inorganic Chemicals Industry, 2022 , 54(1) : 71 -76 . DOI: 10.19964/j.issn.1006-4990.2021-0168
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