A RECYCLING AND TREATMENT METHOD OF WASTE LIQUID IN CUTTING MONO SILICON

摘要

The present invention relates to a method for recovering a single crystal silicon wastewater treatment, wherein the method for recovering a single crystal silicon wastewater treatment comprises the following steps: (1) the waste solution is treated with dilute hydrochloric acid, (2) the mixed material is heated and separated into solid form liquid, and water and polyethylene glycol are evaporated together, condensed, dehydrated, polyethylene glycol is recovered, separated (3) the crude solid mixture is subjected to a second washing step using water to obtain a silicon carbide and a second washing solid mixture, and (4) continuously Silicon and silicon carbide can be recovered through a mixed acid solution treatment using HNO ₃ + HF. The operation of the method is easy to control, simple to install, low in production cost, high recovery rate, a total recovery of 26-46% based on waste liquid weight calculation, The mass of the product can be reached or close to the indicator of the standard product and can be applied directly during the process of producing the solar cell. This results in enormous economic benefits, a tremendous contribution to environmental protection, and a very large development prospect.