Nayak Alok Kumar, Behera Binapani, Sarangi Kadambini, Ghosh Malay Kumar, Basu Suddhasatwa
CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.
Academy of Scientific and Innovative Research, Ghaziabad 201002, India.
ACS Omega. 2020 Dec 22;6(1):188-196. doi: 10.1021/acsomega.0c04132. eCollection 2021 Jan 12.
A complete process flowsheet to recover metal values from SmCo-type magnet scrap was investigated. The magnet scrap was leached in chloride medium at pulp density of 2% (w/v) under the optimum conditions of 15% (v/v) HCl and 5% (v/v) HO at 70 °C for 3 h, which yielded 98.5% Sm and 99% Co extractions. The full factorial Design of Experiment technique was adopted for the optimization of leaching conditions. Sm was selectively separated from the leach liquor as precipitated double salt using NaSO. The precipitated double sulfate was later converted to Sm-oxalate, which was subsequently calcined to produce pure SmO. Following Sm separation, Fe was removed through precipitation by raising the pH to 3.0. For Cu and Co recovery, solvent extraction techniques using LIX 84I and Na-CYANEX 272, respectively, were followed. The McCabe-Thiele diagrams for extraction as well as stripping were presented for both Cu and Co.
研究了从钐钴型磁体废料中回收金属价值的完整工艺流程。磁体废料在氯化物介质中，于纸浆密度为2%（w/v）的条件下，在15%（v/v）盐酸和5%（v/v）过氧化氢的最佳条件下，于70℃浸出3小时，钐的浸出率为98.5%，钴的浸出率为99%。采用全因子实验设计技术优化浸出条件。使用硫酸钠将钐从浸出液中选择性地分离为沉淀复盐。沉淀的硫酸复盐随后转化为草酸钐，随后煅烧以生产纯氧化钐。钐分离后，通过将pH值提高到3.0，通过沉淀去除铁。对于铜和钴的回收，分别采用了使用LIX 84I和Na-CYANEX 272的溶剂萃取技术。给出了铜和钴萃取以及反萃取的麦凯布-蒂勒图。
