摘要
针对废加氢催化剂熔炼合金加压氧化酸浸液,采用N235萃取剂萃取分离回收其中的钼与镍。考察了酸浸液中SO_(4)^(2‒)浓度、酸浸液pH值、有机相组成、有机相与水相的相比V(O)/V(A)对钼萃取过程的影响,以及氨水浓度、相比对钼反萃过程的影响。结果表明,较优萃取条件为酸浸液中SO_(4)^(2‒)浓度为1.2 mol/L、酸浸液pH值为0.9、有机相组成(V/V)为10%N235/15%仲辛醇/75%磺化煤油及V(O)/V(A)为1/1,单级钼的萃取率可达99.80%,而镍的萃取率仅为2.35%;较优反萃条件为反萃剂6 mol/L氨水与V(O)/V(A)为1/1,单级钼的反萃率可达90.63%。含镍萃余液及含钼反萃液通过后续的常规净化、结晶制备得到的三氧化钼与硝酸镍,从而实现了废加氢催化剂中有价金属的循环利用。
Molybdenum and nickel were extracted and recovered from the pressurized oxidation acidic leaching solution of a melted alloy of a waste hydrogenation catalyst by using N235 extraction.This work investigated the effects of SO_(4)^(2‒)concentration,pH value of acidic leaching solution,organic phase composition and V(O)/V(A)ratio on molybdenum extraction and the effects of ammonia concentration and V(O)/V(A)ratio on molybdenum reverse extraction.The results show that the optimal extraction conditions are SO_(4)^(2‒)concentration in the acidic leaching solution of 1.2 mol/L,pH value of the acidic leaching solution of 0.9,organic phase composition(V/V)of 10%N235/15%secoctanol/75%sulfonated kerosene and V(O)/V(A)ratio of 1/1.The extraction rate of single-stage molybdenum reaches 99.80%,while that of nickel is only 2.35%.The optimal reverse extraction conditions are ammonia of 6 mol/L and V(O)/V(A)ratio of 1/1,and the stripping rate of single molybdenum is up to 90.63%.High-purity products of molybdenum trioxide and nickel nitrate are prepared from raffinate containing Ni and strip liquor containing Mo by subsequent conventional purification and crystallization,thus realizing the recycling of valuable metals from waste hydrogenation catalysts.
作者
窦中堃
张家靓
陈永强
王成彦
DOU Zhongkun;ZHANG Jialiang;CHEN Yongqiang;WANG Chengyan(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals,Beijing 100083,China)
出处
《有色金属科学与工程》
CAS
北大核心
2024年第1期1-7,共7页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金重点资助项目(51834008)。
关键词
废加氢催化剂
钼镍分离
萃取
N235
waste hydrogenation catalyst
separation of molybdenum and nickel
solvent extraction
N235
