Ammonia in APT crystal mother liquor was removed by adding sodium tungstate with sodium hydroxide and magnesium salts. The results show that the content of ammonia in the treated solution can be removed down to 0.042g/L up to 98.8 ％ removal rate. The resultant sodium tungstate solution was diluted 10 times befote prepared as ion exchange feed solution., the content of ammonia in the raffinate is less than 0.0005％, which can meet China national discharge standard .
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