Deep dechlorination method for zinc electrolyte

• Main Authors: ZHANG CUN, WU ZENGLING, CHA HYUN, WANG ZHENQI, LIU BINGBING, ZHAO BO, OH JAE-KU, JI CHANGQING
• Format: Patent
• Language: Chinese; English
• Published: 13.05.2022
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The method comprises the following steps: S1, copper-cadmium slag pretreatment: taking low-grade copper-cadmium slag generated in a zinc smelting process as a raw material, adding sulfuric acid, heating, stirring and reacting, and filtering; recovering cadmium from the filtrate, washing the filter residue, and roasting; leaching one part of the roasting slag by using sulfuric acid to prepare a copper sulfate solution; s2, dechlorination reaction: adding chlorine-containing zinc electrolyte into a dechlorination reaction tank, adjusting acid, introducing nitrogen, and then adding a copper sulfate solution and roasting slag for reaction; after the reaction is finished, carrying out solid-liquid separation to obtain dechlorination liquid and dechlorination copper slag; zinc powder is added into the obtained dechlorination liquid to remove copper, and copper-removed liquid and copper slag are obtained; the copper-removed liquid is pumped to a purification system for impurity removal, and copper slag returns to th