(1. 西安科技大学 化学与化工学院，西安 710054；
2. 东北大学 资源与土木工程学院，沈阳 110819；
3. 低品位难处理黄金资源综合利用国家重点实验室，上杭 364200)
摘 要: 通过浮选试验、离子浓度测定、动电位测定和理论计算等方法研究了方解石和六偏磷酸钠对白钨矿浮选的影响。结果表明：六偏磷酸钠与方解石存在协同作用，可强化六偏磷酸钠对白钨矿的抑制作用；方解石主要通过钙离子强化六偏磷酸钠对白钨矿的抑制作用，碳酸根离子不影响六偏磷酸钠的抑制性能，过量碳酸根离子的存在反而能够减弱方解石和六偏磷酸钠对白钨矿的协同抑制作用。机理研究表明，方解石表面的钙离子在六偏磷酸钠的作用下可解吸至溶液中，增加溶液中的钙离子浓度，使六偏磷酸钠对白钨矿浮选的抑制作用增强。
关键字: 白钨矿；方解石；六偏磷酸钠；钙离子；浮选
（1. School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;
2. School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China;
3. State Key Laboratory of Comprehensive Utilization of Low Grade Refractory Gold Resources, Shanghang 364200, China）
Abstract:The depressing effect of sodium hexametaphosphate and calcite on scheelite recovery was studied by flotation tests, dissolution measurements and theoretical calculation. The results indicate that the synergistic effect existed between sodium hexametaphosphate and calcite has significant depressing effect on the scheelite flotation. Calcite will enhance the depression of sodium hexametaphosphate with the action of calcium ions on its surface. The carbonate ions have little effect on the depressing effect of sodium hexametaphosphate, instead, the presence of excess carbonate ions can decrease the synergistic depressing effect of calcite and sodium hexametaphosphate on scheelite flotation. The sodium hexametaphosphate can not only react with the scheelite, but also it will deadsorb the calcium ions of calcite, thus increases the calcium ions concentration in solution, which is benefit to the depression of scheelite flotation.
Key words: scheelite; calcite; sodium hexametaphosphate; calcium ions; flotation
