Treatment process of waste mortar in the processing course of silicon crystal

The invention discloses a treatment process of waste mortar in the processing course of a silicon crystal. Monocrystalline silicon Si is separated from silicon carbide SiC by an electrophoretic separation technology to recycle the monocrystalline silicon Si and the silicon carbide SiC, wherein the monocrystalline silicon Si and the silicon carbide SiC are contained in the waste mortar. The treatment process comprises the following steps of: firstly adding 2-5 vol.% of diluted hydrochloric acid solution to the waste mortar, wherein the volume ratio of the diluted hydrochloric acid solution to the waste mortar is 1.5 to 3; subsiding for 24-48 hours, and then discharging supernatant liquid; adding distilled water, and repeatedly subsiding to discharge the supernatant liquid 2-4 times; adding 60-80 vol.% of the distilled water and 0.1-1 wt.% of dispersing agent acacia, ball-milling for 12-24 hours, and then regulating the pH value of a suspension to 3-3.5; carrying out electrophoretic separation to obtain an anode sediment; adding the distilled water and the acacia to the obtained anode sediment to regulate the pH value of the suspension to 3-3.5, and carrying out the electrophoretic separation to obtain a secondary anode sediment; and repeating the steps three times to obtain the anode sediment by five times.