Abstract: The present disclosure relates to the technical field of preparation of copper chloride, and in particular to a method of preparing an electronic-grade copper chloride dihydrate, which mainly includes the following steps: dissolving a copper salt in a first hydrochloric acid solution to obtain a copper salt solution; performing two solid-liquid separations for the copper salt solution to obtain a filtrate; wherein, the two solid-liquid separations do not have sequence and include an adhesive separation and a co-precipitation separation; the adhesive separation is a solid-liquid separation performed by adding a waste PCB board powder and continuously stirring; the co-precipitation separation is a solid-liquid separation performed by adding tin chloride compound and continuously stirring; adding a second hydrochloric acid into the filtrate and adjusting pH and then performing evaporation concentration to a supersaturated solution, adding copper chloride seed crystal and then performing cooling crystallization a

Abstract: A method for preparing a basic copper carbonate is provided. The method includes: mixing a copper hydroxide with water to obtain a precursor slurry; adding an accelerator to the precursor slurry and mixing the two to obtain a first mixture; introducing gaseous carbon dioxide into the first mixture for reaction whereby obtaining a crude basic copper carbonate; and purifying the crude basic copper carbonate whereby obtaining the basic copper carbonate. The accelerator is at least one selected from the group consisting of an ammonia water and an ammonium salt.