RARE-EARTH ORE BENEFICATION AND FEED-GRADE CALCIUM HYDROGEN PHOSPHATEPREPARATION FROM PHOSPHOROUS ORE IN SOUTHERN HENAN PROVINCE,CHINA.
Wang Guangzhou et al.(The Chemistry Department of Henan Nomal University ,Xinxiang 453002)
he new process for rare-earth ore benefication and feed-grade calcium hydrogen phosphate preparation from phosphorous ore in Southern Henan province,China is studied,in which,the decomposition of chlorhydric acid,the reduction of iron scale,the precipitation of oxalic acid,the neutralization of lime milk and ammonia liquor for benificating rare-earth elements and continuous neutralizating filtrate with lime milk for preparating feed-grade calcium hydrogen phosphate are adopted.Through the testing,the optimum process conditions are found. The grade of benefication rare-earth ore can reach about 90%,the recovery rate can be over 70%,the quality of feed-grade calcium hydrogen phosphate can meet the National Standard.