RESEARCH ON FLOTATION AND PURIFICATION OF LOW GRADE MAGNESITE

Magnesite is a very important non-metallic mineral.And it is widely applied in metallurgic,building materials,chemical industry and so on.Low grade magnesite can't be used directly as material of refractory,and as the continuously mining,the reserves of high grade magnesite becomes less and less.Therefore,for better utilization the resources,it is necessary to find a purification method,which is suitable for low grade magnesite.The research used the kind of low grade magnesite as the material.The high grade magnesite obtained contains more than 47% of MgO and less than 0.2% of SiO2 by flotation,the recovery ratio of magnesium oxide of concentrate is 76.25%.The results show the flotation flowsheet is applicable for the purification of the magnesite in Dashiqiao areas.