白钨矿与含钙矿物可浮性研究及晶体化学分析

Study of floatability and crystal chemistry analysis of scheelite and calcium minerals

通过单矿物浮选试验、XPS测试和化学键的理论计算,研究了白钨矿及其它含钙矿物晶体结构与其可浮性之间的关系.结果表明,矿物晶体结构中Ca-X键的由强到弱顺序为:白钨矿,石榴石,方解石,萤石.从矿物表面Ca2+暴露位置考虑,矿物表面Ca2+与油酸根离子反应的有利顺序为:白钨矿,方解石,萤石.六偏磷酸钠对其它含钙矿物的选择性抑制作用在于:其它含钙矿物表面Ca-X强度较弱,矿物表面Ca2+容易与络合调整剂作用而掩蔽于液相中,从而使矿物表面与捕收剂作用的活性质点减少.其他含钙矿物表面∑Ca2+/∑Xn-较高,决定了其矿物表面正电性较高,同时其矿物表面暴露O元素的剩余键强较大,因此羧甲基纤维素可选择性的抑制其他含钙矿物.

The relationship between floatability and crystal structure of scheelite and other calcium minerals was studied through pure mineral flotation test, XPS test and theoretical calcula tion of the chemical bonds. The results show that the order of Ca-X intensity for mineral crystal structure is scheelite〉 garnet〉 calcite〉 fluorite, and the reaction order of Caz＋ and oleate ions is scheelite 〉 calcite〉 fluorite according to exposure position of Ca2＋ on mineral surface. The mechanism that other calcium minerals are inhibited under the action of sodium hexame- tahposphate is the surface Ca2＋ acted with the collector are decreased from solid phase to liquid phase because of weaker Ca-X intensity. Other calcium minerals are inhibited selectively by the carboxymethylcellulose as the result of higher ∑ Ca2＋/∑ Xn- relative content, which cause mineral surface electropositivity to be higher, and larger residual bond strength of oxygen element on mineral surface.