Application of unsaturated fatty acid compound reagent in thereverse flotation of magnesium removal from phosphate ore
Taking Anning Phosphate Mine in Yunnan Province as the research object,this study focuses on the low P2O5 grade(20.00％),high MgO content,complex ore composition,useful minerals such as apatite,and main gangue minerals such as dolomite,quartz,and other silicate minerals.Taking advantage of the characteristic that different numbers of unsaturated bonds contained in mixed unsaturated fatty acids,which have higher solubility than single unsaturated fatty acids,can improve the hydrophobicity of dolomite,a compound mixed fatty acid reagent(ZP)was prepared by compounding oleic acid,linoleic acid,and linolenic acid at a ratio of 50％+30％+20％,and this reagent was used as collectors for reverse flotation of the phosphate ore.The influence of collectors on the wettability of dolomite and the effect of compound agent ZP on the particle size of collector micelles were studied.Based on single-factor experimental research,both open-circuit and closed-circuit tests were conducted.The results show that:the composite agent ZP had a better hydrophobicity effect on dolomite than that of single oleic acid reagent.When the dosage of ZP was 200 mg/L,the contact angle of dolomite could reach 74.62°.ZP collector has a higher solubility than oleic acid,which can improve flotation efficiency;By using a process of one coarse selection,three fine selections,and three sweep selections for reverse flotation,a closed-circuit test can ultimately obtain concentrate indicators with a P2O5 yield of 59.23％,P2O5 grade of 28.36％,MgO grade of 0.63％,and P2O5 recovery rate of 80.16％.
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