Beneficiation Process Test of a High-silicon,High-calcium and Low-grade Magnesite Ore in Liaoning Province
In order to improve the utilization value of low-grade magnesite,aiming at the problem of poor flotation effect of high-silicon and high-calcium low-grade magnesite in a certain area of Liaoning,the optimization test of reverse-positive flotation process is carried out.The results show that under the con-ditions of grinding fineness of-0.074 mm 83%,reverse flotation sodium silicate dosage of 200 g/t,dodecyl-amine dosage of 150 g/t,positive flotation pulp pH value of 12,sodium silicate dosage of 1 000 g/t,sodium hexametaphosphate dosage of 100 g/t,sodium oleate dosage of 1 000 g/t,the closed-circuit process of one roughing one cleaning reverse flotation desilication and one roughing two cleaning positive flotation magne-sium extraction can obtain magnesite concentrate with MgO content of 46.49%,SiO2 content of 0.23%and CaO content of 0.82%,which meets the first grade standard of magnesite the high-efficiency purification of low-grade ore is successfully realized.It provides technical support and demonstration for the sustainable de-velopment and utilization of magnesite resources in this area.
high-silicon and high-calcium type magnesitereverse flotationpositive floatationclosed circuit flotation
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