Removal and control of scale-forming ions in the process of vacuum salt-making alkali purification

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Abstract By studying the behavior of scale-forming ions (Ca²⁺, Mg²⁺ and CO₃^2-) in the process of brine two-alkali purification, the basic rules of removal and control of scale-forming ions in brine purification was revealed. The effects of the amount of "NaOH-Na₂CO₃" two alkalis on the purification effect of calcium and magnesium ions in brine and the concentration of residual carbonate ions in refined brine were studied. The results show that by optimizing the dosage of two alkalis and adjusting the pH value of brine, calcium and magnesium ions can be removed, and the efficient utilization of carbonate ions can be realized. The content of residual carbonate ions in refined brine can be controlled, and the total amount of scale-forming ions in refined brine can be reduced. The optimal dosages of NaOH and Na₂CO₃ were 0.25 g·L^-1 and 1.35 g·L^-1, respectively. After purification, the total concentration of calcium and magnesium ions in the refined brine was 12.80 mg·L^-1, the concentration of residual carbonate ions was 151 mg·L^-1, and the total amount of scale-forming ions was 163.80 mg·L^-1. Compared with the original process, the concentration of residual carbonate ions in the refined brine was reduced by 32%, and the total amount of scale-forming ions was reduced by 30%. The formation of CaCO₃ scale in the vacuum salt production process was reduced. The production cycle of vacuum salt production was extended from 66 days to 85 days, and the long-term operation was realized. It was found that the main components of the sediment produced in the brine purification process were calcite calcium carbonate and a small amount of magnesium hydroxide.

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	ZHENG Sanqiang
	LUO Xingguo
	LI Xingbin
	WEI Chang
	DENG Zhigan
	LI Minting

Keywords： vacuum salt-making； brine purification； scale-forming ions； removal of calcium and magnesium

Received 2021-03-05;

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ZHENG Sanqiang, LUO Xingguo, LI Xingbin, WEI Chang, DENG Zhigan, LI Minting.Removal and control of scale-forming ions in the process of vacuum salt-making alkali purification[J] Chemcial Industry and Engineering, 2022,V39(1): 58-65

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