Abstract
CLT acid (2-amino-4-methyl-5-chlorobenzenesulfonic acid) is a red organic pigment intermediate, which is widely used in textile printing and dyeing industry, but a large amount of acidic MgSO4 high-salt wastewater will be generated during the production process. Direct discharge not only wastes sulfates in wastewater, but also damages the environment. In this paper, a new treatment process is developed to separate and recover MgSO4 from high-salt wastewater by thermal evaporation crystallization method, which realizes the resource utilization and ensures the treatment effect. Through the evaporative crystallization kinetic experiment and the pilot experiment of acidic MgSO4 high-salt wastewater, the influence of operating conditions on the product crystal size and crystal size distribution was investigated. The results show that the crystal growth is completed when the residence time is 40 min, the stirring speed is 200 r/min, and the seed content is 3 g/L. In industrial production, crystallization and recrystallization should be carried out after removing organic matters. When the concentration ratio is 1.6, the purity of MgSO4 crystal reach 96 %, and the resources can be maximized.
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