李建采用Mextral336A从碱浸液中萃取钼的选读.docx

采用Mextral336A从碱浸液中萃取钼的研究李建，徐志刚，邹潜, 王朝华重庆浩康集团金属萃取工程技术研究中心，重庆 401221摘要：对Mextral336A萃取碱浸液中的钼进行了实验研究，考察了各种因素对钼萃取的影响，确定了较优的萃取和反萃工艺参数。实验结果表明: 针对含钼约10g/L的碱性料液，pH为8左右，萃取剂组成为10%Mextral336A+10%异辛醇+80%MextralDT100（稀释剂），混合时间为3min，萃取相比（O/A）为1:2，反萃氨浓度为2mol/L，反萃相比（O/A）为4:1时，钼萃取率可达到99.9 % ,钼反萃率可达到99 %。关键词：钼；Mextral 336A；溶剂萃取；碱浸液 Solvent Extraction of Molybdenum(ⅵ) in Alkaline Leaching Solution using Mextral336ALI Jian, XU Zhi-gang, ZOU Qian, WANG Chao-huaHallochem Group, Solvent Extraction Engineering Research Center, Chong Qing 401221, ChinaAbstract: Mextral336A has been used in this work to investigate the solvent extraction of molybdenum(ⅵ) in alkaline leaching solution . The effect of various parameters was discussed, and the optimized extraction and stripping process parameters were obtained. It was revealed that when the pH of alkaline leaching solution was about eight, the molybdenum concentration was about 10 g/L，the formulation of extractant was 10% Mextral336A+10% isooctanol +80% MextralDT100(diluents), extraction mixing time was 3mins, extraction phase ratio(O/A)was 1:1.4, the concentration of ammonia was 2.5mol/L and phase ratio(O/A)was 5:1 in stripping, the extraction ratio reached 99.9%, the stripping ratio reached 99%.Keywords：Molybdenum; Mextral 336A; Solvent extraction; Alkaline leaching solution镍钼矿是我国特有的多金属复杂矿资源，分布广、储量大、有价金属镍、钼品位高，且含有铂族金属及贵金属，具有巨大的综合利用价值[1]。溶剂萃取法因具有生产量大、设备简单、操作简便、易于实现自动化、连续化控制，以及回收率高、成本低等优点，已越来越成为钼湿法冶炼的热门工艺。关于钼的萃取剂有很多，主要有胺类萃取剂、磷酸类萃取剂以及螯合萃取剂。在碱性及中性条件下，钼主要以MoO42-形式存在，可采用胺类萃取剂萃取。肖朝龙[2]等研究了采用N235从镍钼矿盐酸浸出液中萃取钼，所用有机相组成为20%N235+10%仲辛醇+70%煤油，经过五级萃取，钼的萃取率可达98%。Jyoti Kushwaha[3]等研究了采用ALIQUAT 336萃取废催化剂焙砂酸浸液中的钼，有机相浓度为5%（v/v），萃取相比（O/A）为1:2，经过两级萃取，钼的萃取率几乎达到100%，采用0.4%NaOH几乎可以定量地反萃负载有机相中的钼。钟宏[4]等研究了采用N235从含钼和锰的浸出液中回收钼，有机相成分为20%N235+10%仲辛醇+70%煤油，经过三级萃取，钼的萃取率可达99%。由于钼在酸性条件下主要以MoO22+形式存在，可采用酸性萃取剂或螯合类萃取剂进行萃取。Wu Jun[5]等研究了Cyanex272萃取镍钼矿酸浸液中的钼，有机相组成为15% Cyanex272+15%TBP+70%煤油，经过五级逆流萃取，钼的萃取率可达到97%以上。Zhang Pingwei[6]等选用Lix63从含铁、铝、钴、镍的硫酸溶液中选择性萃取钼。当pH小于2时，绝大部分钼都可以萃取进入有机相，