| 摘要 |
The present invention relates to a method for recovering high purity potassium iodide and borides from aqueous waste from a polarizing film manufacturing process with high efficiency by concentrating, cooling, and filtering aqueous waste of pH 9 or more from a polarizing film manufacturing process in multiple steps and applying a specific aging step to the aqueous waste. [Reference numerals] (AA) Collect B compound;(BB) 1-4% KI waste solution;(CC) Control pH;(DD) First concentrate/cool/filter;(EE) Second concentrate/cool/filter;(FF) Third concentrate;(GG) Maturing;(HH) Filtering;(II) Fourth concentrate;(JJ) Crystal;(KK) Organic solvent washing;(LL) Heat treatment;(MM) Impurity removal |
