Decolorization and Quality Improvement Process of Phosphogypsum by Co-reverse Flotation and Its Mechanism
In order to solve the problems of land occupation,environmental pollution and resource waste caused by the excessive storage of phosphogypsum,the co-reverse flotation process was used to remove organic matter and silicon impurities from phosphogypsum,so as to obtain its primary purification and enrichment.Firstly,the reverse flotation process parameters were determined by single factor test.The results showed that when the pulp pH was 7,the dosage of foaming agent MIBC was 300 g/t,and the dosage of collector tetracyltrimethyl ammonium chloride was 100 g/t,the best indexes of phosphogypsum concentrate obtained by a single reverse flotation were as follows:34.05%of Whiteness,92.17%of purity,1.98%of SiO2 content,indexes were greatly improved compared with the raw ore,especially in the removal of silicon,SiO2 removal rate up to 78.57%.Secondly,in order to further examine the influence of product granularity on whiteness,the grinding behavior of the product was studied.The results showed that the whiteness of phosphogypsum concentrate was close to the maximum value when the-74 μm fineness of phosphogypsum was over 95%,and the whiteness of phosphogypsum concentrate was increased from 34.05%to 55.68%.Finally,the study on the mechanism of the collector showed that tetracyl-trimethylammonium chloride was mainly adsorbed on the surface of SiO2 in the form of physical adsorption and hydrogen bond adsorption to achieve the desiliconization of phosphogypsum.It provides a feasible pretreatment scheme of decolorization and impurity removal for the resource utilization of phosphogypsum.
phosphogypsumreverse flotationdecolorization and quality improvementcollector
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