FIELD: chemistry.
SUBSTANCE: invention relates to removal of manganese from nickel chloride solutions used in nickel electrolysis. Content of the chloride ion in the nickel chloride solution is increased to 8.2-9.0 M by adding nickel chloride with concentration of 190-210 g/l nickel or hydrochloric acid with concentration of 9-11 M HCl. The nickel solution is then treated with an extraction mixture containing 33-41% trioctylamine in chloride or sulphate form, 35-60% 2-octanone and an inert diluent - Exide-100 or Shellsol D-40. Extraction treatment is carried out in 1-2 steps for 2-3 minutes with extraction of manganese (II) into an organic phase and obtaining a pure nickel chloride solution.
EFFECT: purifying nickel chloride solution to residual manganese (II) concentration of 5-8 mg/l while reducing the number of extraction steps and duration of the process.
6 cl, 7 ex
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