Tributyl phosphate(TBP) was employed for the Bi(Ⅲ) extraction from hydrochloric acid medium.The effects of extraction time and material concentration were examined.The replacement mechanism between the anion(Cl^-) an...Tributyl phosphate(TBP) was employed for the Bi(Ⅲ) extraction from hydrochloric acid medium.The effects of extraction time and material concentration were examined.The replacement mechanism between the anion(Cl^-) and TBP was proposed for extraction.The results show the species extracted into the organic phase were found to be mainly BiCl_3·x TBP(x=2 or 3).Thermodynamic parameters of the extraction reaction were obtained from the thermodynamics analysis,which illustrates that higher temperatures show a negative effect on the extraction.Extraction isotherm was obtained with 2.16 mol/L TBP for a typical solution containing 0.1 mol/L of bismuth and 1.0 mol/L of hydrochloric acid.About 98.5 % of bismuth has been extracted from the leaching solution under the optimum condition.Moreover,oxalate was explored as a precipitation stripping agent for BiCl_3·x TBP(x=2 or 3) complexes,by which Bi(Ⅲ) was stripped in the form of Bi_2(C_2O_4)_3·7H_2O.A stripping efficiency of 99.3% was obtained in only one stage at the phase ratio of 1 and TBP also could be recycled.Therefore,the method is an efficient,effective and highly selective approach to extract Bi(Ⅲ) and to recover metal bismuth.展开更多
在设计的新型微孔分散轮盘塔中,采用微孔分散技术对萃取过程进行强化传质,以磷酸/水/TBP+煤油为实验体系,研究了该萃取设备净化湿法磷酸的萃取特性。考察了孔径为75μm的微孔网分散轮盘在不同相比、转速、停留时间下对萃取率和反萃取率...在设计的新型微孔分散轮盘塔中,采用微孔分散技术对萃取过程进行强化传质,以磷酸/水/TBP+煤油为实验体系,研究了该萃取设备净化湿法磷酸的萃取特性。考察了孔径为75μm的微孔网分散轮盘在不同相比、转速、停留时间下对萃取率和反萃取率的影响,并在不同转速下与普通转盘塔进行了对比,结果表明:微分散轮盘比普通转盘有较好的分散效果,其中转速对其有明显影响;萃取的适宜条件为转速250 r min 1,相比4:1,停留时间10 min,磷酸萃取率可达54.92%;当转速250 r min 1,相比为6,停留时间15 min,磷酸反萃率可达85.33%。展开更多
基金Project(2011AA061002)supported by the High-Tech Research and Development Program of ChinaProject(2010SK2010)supported by the Key Program of Science and Technology of Hunan Province,ChinaProject supported by the Hunan Nonferrous Metals Fund,China
文摘Tributyl phosphate(TBP) was employed for the Bi(Ⅲ) extraction from hydrochloric acid medium.The effects of extraction time and material concentration were examined.The replacement mechanism between the anion(Cl^-) and TBP was proposed for extraction.The results show the species extracted into the organic phase were found to be mainly BiCl_3·x TBP(x=2 or 3).Thermodynamic parameters of the extraction reaction were obtained from the thermodynamics analysis,which illustrates that higher temperatures show a negative effect on the extraction.Extraction isotherm was obtained with 2.16 mol/L TBP for a typical solution containing 0.1 mol/L of bismuth and 1.0 mol/L of hydrochloric acid.About 98.5 % of bismuth has been extracted from the leaching solution under the optimum condition.Moreover,oxalate was explored as a precipitation stripping agent for BiCl_3·x TBP(x=2 or 3) complexes,by which Bi(Ⅲ) was stripped in the form of Bi_2(C_2O_4)_3·7H_2O.A stripping efficiency of 99.3% was obtained in only one stage at the phase ratio of 1 and TBP also could be recycled.Therefore,the method is an efficient,effective and highly selective approach to extract Bi(Ⅲ) and to recover metal bismuth.
文摘在设计的新型微孔分散轮盘塔中,采用微孔分散技术对萃取过程进行强化传质,以磷酸/水/TBP+煤油为实验体系,研究了该萃取设备净化湿法磷酸的萃取特性。考察了孔径为75μm的微孔网分散轮盘在不同相比、转速、停留时间下对萃取率和反萃取率的影响,并在不同转速下与普通转盘塔进行了对比,结果表明:微分散轮盘比普通转盘有较好的分散效果,其中转速对其有明显影响;萃取的适宜条件为转速250 r min 1,相比4:1,停留时间10 min,磷酸萃取率可达54.92%;当转速250 r min 1,相比为6,停留时间15 min,磷酸反萃率可达85.33%。
