REMOVING FLUORITE AND CALCITE FROM SCHEELITE DURING FLOATATION SEPARATION PROCESS WITH CALCIUM-AND SODIUM-CONTAINING REAGENTS

摘要

Separation removal of fluorite and calcite from scheelite is a difficult technical operation in current industrial practice with a heating process causing large energy consumption and high production costs. In this work, the floatation separation at room temperature were carried out using two types of skarn scheelite ores. The results showed that CaO and Na_2O_3 are better than NaOH as a regulator in pH value. In the rough floatation and first cleaning floatation, CaO (500g/t), Na_2O_3 (3000g/t) were used as a pH regulator, waterglass (4000g/t) was as a gangue depressant, oleic acid or sodium oleate were used as a collector. The degree of the obtained WO_ concentrate was more than 65% (commercial product).