EXTRACTING REAGENT USED TO EXTRACT AND SEPARATE NICKEL AND COBALT AND METHOD FOR USING SAID EXTRACTING REAGENT

摘要

A monoalkyl alkylphosphonate represented by the formula (I), (wherein R1 and R2 each represents an alkyl group, with R1 containing 4 carbon atoms and R2 containing 8 carbon atoms) is used as an extractant for separating and recovering nickel and cobalt from Ni- and Co-containing scraps, waste catalysts, etc. according to solvent extraction. The use of this extraction enables one to conduct smooth pumping or the like even when cobalt is contained in a high content since the kinematic viscosity is not increased so much, and to easily obtain highly pure nickel and cobalt due to its extremely high extractive separation coefficient of nickel and cobalt. CHEM