Flotation Separation Of Scheelite From Fluorite,Calcite And Quartz

At present most tungsten beds founded in China are skarn type in which associated gangue minerals contain such as calcite, fluorite. Those minerals have similar surface chemical composition with scheelite and this depressed the selectivity on scheelite. To solve this problem, five representative collectors were examined on the flotation behaviour of scheelite, fluorite, calcite and quartz with different pH regulators and depressant sodium silicate. The mechanism between reagents and minerals is discussed by solution chemistry of flotation calculation, dynamic potential analysis, infrared spectrum analysis. Based on pure mineral results actual ore flotation of Shi Zhu yuan was carried out.Pure mineral flotation results indicate that:collectors have good collectivity for scheelite, fluorite and calcite, have similar flotation behavior and this makes it difficult to recovered scheelite effectively in the actual production; Under alkaline condition, along with the increasing dosage of sodium silicate, when using TAB-3 developed by Guangzhou Research Institute of Non-ferrous Metals, fluorite can be depressed distinctly by sodium silicate and calcite also obviously; Under low alkaline condition, with low dosage of sodium silicate, TAB-3 showing strong selective-collecting ability for scheelite and quartz. When using sodium silicate as depreesant, with NaOH as pH regulator, TAB-3 shows strong selective-collecting ability, it is advantageous to flotation separation of scheelite from fluorite, calcite and quartz.From scheelite flotation tests of a wolframite-scheelite associated,fluorite richly and calcite included ore of Shi Zhu-yuan. According to the raw ore in which with 0.26%WO3 in the form of scheelite, adopt regulators TT + sodium silicate, new collector TAB-3, mineral dressing index of scheelite pre enrichment concentrate in lab assaying WO311.70%, with recovery 73.23% was obtained, realized separation of scheelite and fluorite, calcite. Compared with former experiment technology, about more than 10% of total recovery of tungsten has been acquired.By experiment studies, SiO(OH)3-may be the main component that play the role as inhabition, meanwhile there are [Si(OH)4], [SiO2(OH)22-] of sodium silicate in solution. Dynamic potential and infrared spectrum results show that:TAB-3 can occur chemical adsorption on scheelite, non-chemical adsorption on fluorite, adsorption on calcite weakly. Sodium silicate can adsorpt on scheelite in the form of associating hydroxyl, and TAB-3 can still occur chemical adsorption; Sodium silicate can adsorpt on fluorite in the form of SiO2- and SiO44-; and calcite of SiO44-. The adsorption forms and intensity of sodium silicate enlarged the flotability differences between scheelite, fluorite and calcite.