Industrial waste salt resourceful treatment method and device

An industrial waste salt resourceful treatment method, comprising the following steps:

• the industrial waste salt being sequentially subjected to steps comprising dissolving, chemical pre-purification, deep purification, organic matter concentration reduction, adsorption and oxidation decolorization and multi-effect evaporative crystallization to respectively obtain sodium sulfate, sodium chloride and sodium nitrate crystals;
• wherein sodium sulfate is crystallized in a temperature range of 75° C. to 85° C.;
• sodium chloride is crystallized in a temperature range of 60 to 70° C.;
• and sodium nitrate is crystallized in a temperature range of 45° C. to 55° C.,
• wherein the multi-effect evaporative crystallization comprises the salt solution after the adsorption and oxidation decolorization being sequentially subjected to a first-effect evaporation, a second-effect evaporation, a three-effect evaporation, and a four-effect evaporation to obtain a mother liquor that is subjected to three crystallization steps to respectively obtain sodium sulfate, sodium chloride and sodium nitrate,
• wherein a temperature of the first-effect evaporation is in a range of 110-120° C., a temperature of the second-effect evaporation is in a range of 100-110° C., a temperature of the third-effect evaporation is in a range of 85-95° C., and a temperature of the fourth-effect evaporation is in a range of 75-85° C.