铜钼分离抑制剂分子生命周期评价

针对选矿药剂对环境影响较大的问题,首次利用生命周期评价技术,建立了铜钼分离抑制剂NaHS与BK511生命周期排放评价模型,并对比二者的生命周期排放评价指标。研究表明:BK511产品毒性低,用量少,采用一锅法制备技术,生产和制备过程不产生三废,使用过程有害物质排放少,说明与NaHS比较,BK511生命周期排放综合外部成本降低,对环境影响小。从产品抑制性能及降低生命周期排放角度两个方面证明,BK511是清洁、高效的铜钼分离抑制剂,是NaHS优良的替代物。

Depression effect of pseudo glycolythiourea acid in flotation separation of copper-molybdenum

Pseudo glycolythiourea acid（PGA） was synthesized and used as depressant for flotation separation of Cu and Mo.The results indicate that a low amount of PGA has strong depression effect on chalcopyrite.Mo grade of 26.17% and recovery of 89.83% were achieved with rougher and scavenger one time and cleaners twice,while the recovery of Mo was deceased by 2% when Na2S was used as depressant.Measurement on adsorption of PGA on the mineral surface indicates that PGA and xanthate were adsorbed on mineral surface by competition,and PGA was adsorbed on chalcopyrite surface much stronger than on molybdenite surface.FTIR results indicate a chemical absorption process for PGA on chalcopyrite surface and a physical adsorption process on molybdenite surface.The frontier orbital calculation shows that the S atom is an active center,and the depression of PGA can be explained with the Fermi level of energy based on the electrochemical mechanism.

浅淡巯基乙酸钠的生产及在选矿中的应用

巯基乙酸钠其使用特点是无污染、高效等,逐步取代了剧毒的抑制剂氰化钠,海波法生产的巯基乙酸钠主要有制盐工序、缩合工序、巯基化工序等几步,增加了新式萃取除杂、浓缩等工艺,保证了产品的质量。经过大量的实验室小型试验及工业生产试验,都能取得较好的选矿效果。