Waste residue comprehensive utilization method for trichlorosilane leaching system

The invention discloses a waste residue comprehensive utilization method for a trichlorosilane leaching system. The waste residue comprehensive utilization method comprises the following steps: filter pressing a leaching waste residue mixed solution formed by the leaching system by using a filter press to obtain leaching waste residue; putting the leaching waste residue into a drum mixer, adding an appropriate amount of tap water, and stirring to obtain a slurry; discharging the slurry to a dissolving tank by utilizing a high potential difference, adding the appropriate amount of the tap water, mechanically stirring to dissolve for 1.5-4 hours, and obtaining a feed liquid containing sodium chloride; filter pressing the feed liquid to obtain insoluble residue and filtrate, storing the insoluble residue for later use, performing secondary refined filtration on the obtained filtrate, injecting a refined filtration mother liquid into a double-effect evaporator through a centrifugal pump to evaporate and crystallize, and obtaining a finished product, sodium chloride with the purity of more than 99%. According to the waste residue comprehensive utilization method for the trichlorosilane leaching system, soluble salt and insoluble salt are effectively separated, and a purpose of recycling leaching waste residue in a classifying manner is achieved; the environment pollution and the wasting of resources are reduced, and the economic benefits are increased.