【Ten Years of Rapid Development in Chemical Equipment】Commissioning of the Potassium Chloride Production Unit for the Comprehensive Utilization of Salt Production Waste Liquids Project, 1266–2023

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Recently, the commissioning trial of the potassium chloride production unit in Tianjin Changlu Haijing Group’s Marine Technology Company (abbreviated as Changlu Haijing Marine Technology) for the comprehensive utilization of salt-making waste liquids was a complete success. The main function of this project is to treat the mother liquor resulting from salt production at the first branch plant, thereby preventing pollution caused by the direct discharge of concentrated seawater into the sea; it is a comprehensive environmental protection system. The design of this project utilizes advanced domestic steam-jet compression heat pump TVR+III-effect evaporation + concentration process technology; compared to the two-effect evaporation process used before the relocation, it reduces the steam consumption per unit of product. The cleaning cycle is extended from 16 hours to 2 days, which **slows down the rate of scaling in the heating chamber and reduces energy consumption. In addition, both potassium chloride and magnesium chloride are controlled by a DCS automated control system, which enables precise control and optimization of the production process, **increasing production efficiency and reducing production costs. It is reported that the commissioning of the potassium chloride production unit in this project took 10 days from the start of feeding materials for trial production; qualified potassium chloride and double-effect salt products were produced for the first time, thereby establishing the entire production process and enabling continuous and stable operation of the unit. According to laboratory analysis, the quality of potassium chloride products meets or exceeds the first-class national standards, while the quality of the secondary-effect salt products satisfies the top-grade standards. In addition, they produced concentrated brine for use in the magnesium chloride production process, thereby preparing for the trial production phase; the first goal of this trial production was achieved, with a successful start from the very beginning. Changlu Haijing Marine Technology stated that in the next phase, it will focus on optimizing the process flow of the magnesium chloride production facility, with the goal of increasing the production capacity and product quality of potassium chloride and magnesium chloride. It will continue to refine process parameters and improve the management and maintenance of equipment, striving to successfully complete all the testing tasks related to the comprehensive utilization of salt production waste, thereby laying a solid foundation for the company’s high-quality and sustainable development.