Study on new process for beneficiation phosphate of low-grade phosphate rock leaching via lactic acid
The P2O5 content in the low-grade rare earth-containing phosphate ore in Guizhou Zhijin is 15.47%.This ore is mainly composed by fluorine apatite,colloidal phosphate site,dolomite,quartz,etc.It is difficult to separate P2O5 from this kind of ore effectively by using traditional method.In order to solve this problem,low molecular weight lactic acid was used as leaching agent to selectively dissolve the carbonate components in the ore,and the useful component was retained be-cause it was insoluble in lactic acid,and the purpose of enriching P2O5 was achieved after filtering the filtrate.The effects of lactic acid concentration,reaction time,reaction temperature,liquid-solid ratio,ore particle size on the enrichment effect of P2O5 were investigated in details.The results showed that under the conditions of lactic acid concentration of 9%,reaction temperature of 50 ℃,reaction time of 3 h,liquid-solid ratio(V/m,mL/g)of 30∶1,ore particle size of 0.075～<0.09 mm,the P2O5 content in phosphate ore was 33.99%,which was met the market standard.The process of using lactic acid to selec-tively leach carbonate gangue components in phosphate ore to enrich P2O5 had the characteristics of high enrichment rate,simple,economic and energy saving,which could effectively improve the comprehensive utilization rate of rare earth phos-phate ore resources,and showed good application prospects.
low and middle grade phosphate orelactic acidselective leachingbeneficiationP2O5
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