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.