PROCESS FOR PREPARING SODIUM PERBORATE FROM WASTED WATERS

摘要

The process comprises use of waste from boric acid prepn. from refined borax, etc.. The sodium sulphate is sepd. from the BO3(3-) ion by treatment with 50 per cent NaOH soln., pref. with 1.02 molar ratio of NaOH:H3BO3. After neutralisation, the boric acid is converted to sodium metaborate and sodium sulphate, and cooling crystallises the sulphate at the perborate crystallisation point e.g. 0 deg.C. The obtd. metaborate soln. is oxidised by 35 per cent oxygenated water.