Preparation method for electronic-grade copper chloride dihydrate

A method of preparing an electronic-grade copper chloride dihydrate, comprising the following steps:

• (1) dissolving a copper salt in a first hydrochloric acid solution to obtain a copper salt solution;
• (2) 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 printed circuit board (PCB) powder and continuously stirring, wherein the waste PCB powder comprises epoxy resin;
• the co-precipitation separation is a solid-liquid separation performed by adding tin chloride compound and continuously stirring, wherein the co-precipitation separation proceeds in a water bath of 60° C. to 90° C.;
• (3) adding a second hydrochloric acid into the filtrate and adjusting pH to 0.1 to 2.5 and then performing evaporation concentration to a supersaturated solution, adding copper chloride seed crystal and then performing cooling crystallization and centrifugal separation to obtain an electronic-grade copper chloride dihydrate product.