Method for removing F and Cl in secondary zinc oxide soot and preparing pure electrolyte

• Main Author: CHEN KEYAN
• Format: Patent
• Language: Chinese; English
• Published: 19.06.2020
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a method for removing F and Cl in secondary zinc oxide soot and preparing a pure electrolyte. The method comprises the following steps that industrial sulfuric acid is added into the secondary zinc oxide soot, and granulating is carried out; the particles obtained in the step (1) are roasted in a rotary kiln at the temperature of 600-800 DEG C for 3-5 hours; the roasted particles are added into electrolyte residual liquid which is 3-5 times the volume of the roasted particles for leaching, the pH value of a leaching end point is controlled to be 3.3-4.1 by supplementing industrial sulfuric acid, leaching is carried out for 4-5 hours, and filtering and separating are carried out to obtain leachate; hydrogen peroxide and lime milk are added into the leachate, the pHvalue is controlled to be 5.0 and the temperature is controlled to be 45-65 DEG C, maintaining is carried out for 1-2 hours, and filtering is carried out; and CuOH and Ni (OH) 2 are added into the leachate, the pH value is co