Sodium sulfate purification treatment system and treatment process thereof

The invention belongs to the technical field of metal salt separation, and particularly relates to a sodium sulfate purification treatment system and a treatment process thereof. According to the technical key points, the system comprises the following units: a preheating unit, a forced evaporation unit, a forced cooling unit, a thermal melting unit and an evaporative crystallization unit, wherein the forced evaporation unit comprises a plurality of forced evaporation chambers which are connected in series, and each forced evaporation chamber is connected with a compressor; the forced cooling unit comprises three stages of cooling, namely a first-stage forced cooling chamber, a second-stage forced freezing crystallization chamber and a third-stage forced freezing crystallization chamber; the evaporative crystallization unit comprises a forced evaporative crystallization chamber and a compressor. According to the invention, before evaporative crystallization, sodium sulfate is purified in a three-stage cooling