ACTIVATION AND DEPRESSION OF CALCITE IN CALCIUM MINERALS FLOTATION

来源期刊：中国有色金属学报(英文版)1999年第2期

论文作者：Tian Xueda Zhang Xiaoyun Li Longfeng Wang Dianzuo

文章页码：374 - 377

Key words：flotation　,calcite　,scheelite　,fluorite

Abstract: In the flotation of scheelite ore containing fluorite and calcite, the treatment of calcite is important to obtain satisfactory scheelite and fluorite concentrate. It is better in scheelite rougher flotation to activate calcite with Na₂CO₃and to float it into scheelite rough concentrate,than to depress calcite into fluorite flotation operation like the conventional process. By activating calcite with Na₂CO₃ in scheelite rougher flotation the fluorite flotation can be carried out more easily, and the fluorite concentrate with a grade of CaF₂ 97.42% and CaCO₃ 0.73%, compared with that of a grade of CaF₂ 95.78% and CaCO₃ 1.54% without Na₂CO₃, was gained. The calcite, which was activated and floated into scheelite rough concentrate, can be depressed and removed with Petrov’s process or acid leaching, so it has no obvious negative effect on scheelite concentrate. The mechanism of activation is due to homo-ion effect of Na₂CO₃ in calcite pulp.