Application of NSOH in fluorite ore flotation and its depressing mechanism

作者：Yin Wan Zhong^*; Lu Zhen Fu; Han Yue Xin; Li Yan Jun

来源：Journal of Northeastern University, 2009, 30(2): 287-290.

• Adsorbabilities
• Bulk flotations
• Clean outs
• Depressant
• Flotation tests
• Fluorite ore
• NSOH
• Recovery rates
• Sodium silicates
• Theoretical studies

A new type depressant was introduced in the flotation test of a certain fluorite ore containing carbonates and lots of sludge. Part of calcite and most of fluorite were separated from sludge by bulk flotation under conventional conditions through a rougher as first step, then the fluorite and calcite were separated by another rougher. A process of several steps in cleaning flotation was needed to obtain desirable fluorite concentrates, including the grinding once, roughing twice, clean-out five times and scavenging twice successively. The contents of CaF2 and CaCO3 in concentrate are 95.37% and 3.06%, respectively, with a recovery rate of CaF2 76.61% and the grade of CaF2 in tailing 12.36%. Theoretical study showed that Si(OH)4 and SiO2(OH)22- are the main components to depress calcite mineral in modified sodium silicate and the sequence of depressibility is SiO2(OH)22- > Si(OH)4 > HSiO3-. The depressibility was mainly due to the different adsorbabilities of Si(OH)4 and SiO2(OH)22- for different minerals among which the highly adsorbable ones are easy to be depressed, while those minerals which cannot adsorb Si(OH)4 and SiO2(OH)22- firmly even are unable to adsorb them are not easily to be depressed or cannot be depressed at all.

• 出版日期2009
• 单位东北大学