硫氨酯捕收剂的制备及浮选性能  

Preparation and flotation performance of thionocarbamates

作　　者：马鑫[1,2] 曹占芳 王帅[1,2] 黄小平 钟宏[1,2] MA Xin;CAO Zhan-fang;WANG Shuai;HUANG Xiao-ping;ZHONG Hong(College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources,Changsha 410083,China)

机构地区：[1]中南大学化学化工学院,长沙410083 [2]锰资源高效清洁利用湖南省重点实验室,长沙410083

出　　处：《工程科学学报》2023年第8期1254-1263,共10页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(52074354)。

摘　　要：为解决硫氨酯捕收剂制备过程中副产品处理困难、存在污染等问题,设计了四种新工艺制备乙硫氨酯(IPETC),分别联产对叔丁基苄基硫醇(BBSH)、苄基三硫代碳酸盐(BTTC)、苄硫基乙基黄药(SBEX)、二苄基二硫醚.在优化的合成工艺条件下,合成IPETC联产BBSH,得到含IPETC和BBSH的复合捕收剂,其中IPETC的质量分数为51%,BBSH的质量分数为41%,IPETC和BBSH的收率达到95%;合成IPETC联产BTTC,IPETC和BTTC的收率分别达到94%和95%,纯度分别为91%和82%;合成IPETC联产SBEX,IPETC的收率和纯度分别达到89%和95%,SBEX的收率和纯度分别为93%和91%;合成IPETC联产二苄基二硫醚,IPETC的收率和纯度分别达到93%和92%,二苄基二硫醚的收率和纯度分别达到95%和94%.考察了制备的复合捕收剂(IPETC与BBSH)对铜钼矿的浮选性能,结果表明,复合捕收剂对铜钼矿表现出良好的捕收性能.联产的新型捕收剂SBEX、BTTC对黄铜矿的捕收力略强于异丁基黄药,对黄铁矿具有较好的选择性,可替代异丁基黄药浮选硫化铜矿.红外光谱和X射线光电子能谱分析结果表明,SBEX、BTTC与黄铜矿作用时,捕收剂分子中的C=S和C—S与矿物表面的金属Cu作用,生成捕收剂与铜的表面络合物吸附在黄铜矿的表面.To address the problems of byproduct treatment and pollution in thionocarbamate preparation,four novel processes for preparing O-isopropyl-N-ethyl thionocarbamate(IPETC)were designed,which can coproduce 4-(tert-butyl)benzyl mercaptan(BBSH),sodium benzyl trithiocarbonate(BTTC),sodium O-benzylthioethyl xanthate(SBEX),and benzyl disulfide,respectively.All the products were confirmed via FTIR and mass spectrometry.The composite collector(IPETC and BBSH mass contents were 51%and 41%,respectively)was synthesized via one-pot reaction of sodium isopropyl xanthate,4-tert-butylbenzylchloride,and ethylamine using tertbutyl alcohol as solvent.The yield of IPETC and BBSH was 95%in the process of coproducing IPETC and BBSH.Specifically,BTTC and IPETC were synthesized via a reaction of sodium isopropyl xanthate,benzyl chloride,ethylamine,carbon disulfide,and sodium hydroxide.The IPETC and BTTC yields were 94%and 95%with a purity of 91%and 82%in the process of coproducing IPETC and BTTC,respectively.Meanwhile,SBEX and IPETC were synthesized via reaction of sodium isopropyl xanthate,2-chloroethanol,ethylamine,benzyl chloride,carbon disulfide,and sodium hydroxide.The IPETC and SBEX yields were 89%and 93%with a purity of 95%and 91%in the process of coproducing IPETC and SBEX,respectively.Benzyl disulfide and IPETC were synthesized via a reaction of sodium isopropyl xanthate,benzyl chloride,ethylamine,and hydrogen peroxide.The IPETC and benzyl disulfide yields were 93%and 95%with a purity of 92%and 94%in the processof coproducing IPETC and benzyl disulfide,respectively.The flotation response of copper-molybdenum ore independent with IPETC and BBSH collectors and with their mixture was assessed.The flotation results indicate that the composite collector displays a superior collecting capability for copper sulfide ore.Further,the combination of IPETC and BBSH could give rise to a synergistic effect,significantly enhancing the overall flotation performance.The flotation performance of SBEX and BTTC on chalcopyrite and pyrite was also i

关 键 词：浮选 硫氨酯 三硫代碳酸盐 硫醇 二硫醚 捕收剂 

分 类 号：TD952[矿业工程—选矿]