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Abstract The utilization of high-salt wastewater is an important direction for the treatment of heavy pollution in the electroplating industry. In order to explore the separation of mixed salt from high-salt wastewater by induced crystallization, the conditions of induced crystallization in simulated salt solution were investigated, and the results showed that the best condition for cooling and crystallization of sodium sulfate solution is pH 6, adding 0.04% analytical pure sodium sulfate particles; the best condition to induce evaporation and crystallization of saturated sodium chloride solution is to add 0.01% quartz sand crystal at pH 5. According to the optimal crystallization conditions, the mixed salt of high-salt wastewater is subjected to cycle-induced crystallization. Studies have shown that the purity of two products, purified sodium sulfate and sodium chloride, can reach 99.98% and 98.81% after 30 cycles.
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Received: 28 September 2020
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2020, Vol. 33 
