Experimental Study on Beneficiation and Purification of Low-quality Natural Gypsum Ore
The main mineral component of low-quality natural gypsum ore is gypsum,which contains some impurity minerals such as attapulgite clay,quartz,feldspar,etc.,which seriously affects the application field and application value of its minerals.Therefore,the beneficiation and purification of low-quality natural gypsum ore was carried out in the experimental study,and after the beneficiation process of"Screening-crushing-screening-scrubbing-intelligent sorting"was adopted,the particle size of the sample was between 2～10mm,a CaSO4(on a dry basis)grade of 98.36%,a Pb grade of 0.144mg/kg,As<2.0mg/kg,fluoride(F)<0.003%,Se<0.003%,a drying reduction of 20.3%was obtained,which meets the quality requirements of calcium sulfate for food additives;Simultaneously obtain gypsum concentrate with a particle size between 0.3 and 2mm and a CaSO4·2H2O content of 94.85%,meeting the requirements of α Requirements for raw materials for high-strength gypsum;Tailings can be used for producing agricultural fertilizers or as soil conditioners.It has achieved high added value and comprehensive utilization of gypsum resources.
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