FIELD: chemistry.
SUBSTANCE: invention relates to field of still waste liquid recycling, which is formed in production of coda ash by ammonia method. Still waste liquid is processed with sodium hydroxide with mole ratio CaCl2:NaOH, equal 1:2÷2,25 (mainly 1:2), calcium hydroxide precipitation, which is obtained in the process, is filtered, filtrate, consisting of sodium chloride, is subjected to electrochemical processing in two-chamber electrolyser with cathion-exchanging membrane at current density 350÷1400 A/m2 with obtaining hydroxide of sodium and chlorine.
EFFECT: invention makes it possible to simplify method of still waste liquid recycling, reduce energy consumption on recycling and obtaining calcium hydroxide, hydroxide of sodium and chlorine as marketable products.
1 dwg, 2 tbl, 2 ex
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