Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第3期    总第252期    2020年3月

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文章编号:1004-0609(2020)-03-0657-09
稀土分离AB/BC分馏萃取理论的研究
钟学明,李艳容,徐玉娜,刘俊辰

(南昌航空大学 环境与化学工程学院,南昌 330063)

摘 要: 为了建立AB/BC分馏萃取理论,采用理论分析法建立AB/BC分馏萃取体系的基本关系式,提出出口分量、出口分数、有效分离系数和萃取参数的计算方法。采用计算机动态仿真法研究TmYb/YbLu分馏萃取体系的产品纯度、出口分量、出口组成、分离系数和各级的两相组成。结果表明:产品纯度相对误差在(-3.0~ 10.0)×10-7范围内,萃取参数的计算方法是正确的;当进料量为1 mol/min时,出口分量误差在-50.0~50.0 mmol/min范围内,出口分量的计算结果是准确的;出口组成的误差在(-15.0~10.0)×10-7范围内,AB/BC分馏萃取理论是可靠的。萃取段有效分离系数的相对误差为3.53%;洗涤段有效分离系数的相对误差为0.00%。

 

关键词: 稀土;分馏萃取;AB/BC分组分离;基本关系式;有效分离系数;萃取参数;动态仿真

Study on theory of AB/BC fractional extraction for rare earth separation
ZHANG Xue-ming, LI Yan-rong, XU Yu-na, LIU Jun-chen

School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China

Abstract:In order to establish the theory of AB/BC fractionation extraction, the basic relations of AB/BC fractionation extraction were established by theoretical analysis method. And then, the calculation method of outlet components, outlet ratios, effective separation factors and extraction parameters were presented. The product purity, outlet components, outlet composition, separation factors and rare earth composition both in aqueous and organic phase at every stage of TmYb/YbLu fractionation extraction system were studied by computer dynamic simulation. The results show that the relative error of product purity is within the range from -0.000030% to 0.00010%, so the calculation method of extraction parameters is correct. The error of the outlet components is within the range from -0.0000005 mol/min to 0.0000005 mol/min when the feed amount is 1mol/min, hence the calculation result of the outlet components is accurate. The error of the composition of the outlet is within the range from -0.0000015 to 0.0000010, therefore, the theory of AB/BC fractionation extraction is reliable. The relative error of the effective separation factor in the extraction section is 3.53%, while the relative error in the scrubbing section is 0.00 %.

 

Key words: rare earth; fractional extraction; AB/BC group separation; basic relations; effective separation factor; extraction parameter; computer dynamic simulation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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