METHOD OF DECOPPERING OF NICKEL OR NICKEL-COBALT CONVERTER MATTE Russian patent published in 2005 - IPC

FIELD: metallurgy; nickel and cobalt metallurgy.

SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to nickel and cobalt metallurgy. The method of decoppering of nickel or nickel-cobalt converter matte includes: a primary calcination of the converter matte up to the residual mass share of sulfur from 1.5 up to 2.5 %; a sulfate-chlorinating calcination of a cinder at the temperature from 600°C up to 750°C at presence of a chlorine-containing reactant and oxygen; leaching with the help of the sulfuric acid solution of the water-soluble copper compounds from the chlorinated cinder. At that the primary calcinations of the converter matte is conducted up to a residual mass share of sulfur of no more than 0.3 %, and a sulfate-chlorinating calcination of the cinder is conducted at presence of a chlorine-containing reactant, oxygen and an elemental sulfur. The elemental sulfur is introduced in the reactor of chlorination of the cinder in a mass amount from 50 up to 100 % to the mass of copper in the cinder. At that it allows to achieve selectivity of the copper chlorination, because the cupric oxide is chlorinated better, than nickel and cobalt oxides, and the ratio of nickel to copper in the sulfuric acid solution after the subsequent leaching of the chlorinated cinder in the solution of sulfuric acid is three times lower, than it is in the method of the nearest analog.

EFFECT: the invention allows to achieve selectivity of the copper chlorination, a three times lower ratio of nickel to copper in the solution after the subsequent leaching of the chlorinated cinder in the sulfuric acid solution, than in the method of the nearest analog.

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