Waste liquid treatment methods and boric acid recovery and manufacturing methods

Abstract

A method for treating waste liquid involves selectively recovering boric acid from waste liquid generated during the manufacturing process of a polarizing plate. The method includes the following steps: a waste liquid concentration step, in which the waste liquid is concentrated to obtain a borate concentrate; a borate separation step, in which borate is separated from the borate concentrate; and a concentration and crystallization step, in which an aqueous boric acid solution is generated from the separated borate, and the aqueous boric acid solution is concentrated and crystallized to obtain boric acid.

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