乳酸黄原酸钠合成及其对黄铁矿与黄铜矿抑制的作用机理

Synthesis of sodium lactate xanthate and its inhibition of pyrite and chalcopyrite

通过研究不同工艺条件对合成乳酸黄原酸钠的影响,结果显示乳酸黄原酸钠合成的较优工艺条件为乳酸、CS_2和NaOH摩尔比为1∶1∶2.1,反应温度为40℃,反应时间为4 h.在该条件下,产物产率达到59.25%.利用紫外光谱和红外光谱进一步确认产物为乳酸黄原酸钠.以天然黄铜矿和黄铁矿为研究对象,系统研究了乳酸黄原酸钠对黄铜矿和黄铁矿可浮性的影响.利用Materials Studio软件进行模拟,从分子力学和分子动力学角度研究了乳酸黄原酸钠与黄铜矿、黄铁矿表面作用体系能量变化,模拟结果表明,乳酸黄原酸钠对黄铁矿抑制作用显著,而对黄铜矿抑制作用较差.红外光谱分析进一步验证了模拟结果.

The effect of different conditions on synthesizing sodium lactate xanthate was studied.The results observed showed that the optimum condition was the molar ratio of lactic acid,CS2 and NaOH of 1∶1∶2.1,the reaction temperature of 40℃,and the reaction time of 4 h.Under the optimum condition,the yield of the product reached 59.25%,which was confirmed as sodium lactate xanthate by UV spectrum and IR spectrum.The effect of sodium lactate xanthate on the floatability of natural chalcopyrite and pyrite was studied in detail.With the Materials Studio software,the energy changes of surface interaction of the systems of sodium lactate xanthate and chalcopyrite or pyrite were simulated according to the molecular mechanics and molecular dynamics.The simulation results showed that the inhibitory effect of sodium lactate xanthate for pyrite was stronger than that for chalcopyrite,which were further demonstrated by IR spectroscopic analysis results.