真空制盐两碱净化过程成垢离子的脱除及控制

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摘要通过研究卤水两碱法净化过程成垢离子(Ca²⁺, Mg²⁺和CO₃^2-)的行为，揭示卤水净化成垢离子脱除与控制的基本规律。研究了“NaOH-Na₂CO₃”两碱用量对卤水中钙镁离子净化效果及精卤中残留碳酸根离子浓度的影响。研究结果表明，通过优化两碱用量，调控卤水pH值，可以在脱除钙镁离子的同时，实现碳酸根离子的高效利用，控制精卤中残留的碳酸根离子的含量，减少精卤中成垢离子总量。研究获得最适宜的两碱用量为NaOH 0.25 g·L^-1，Na₂CO₃ 1.35 g·L^-1，净化后精卤中钙离子和镁离子浓度总量为12.80 mg·L^-1，残留碳酸根离子浓度为151.00 mg·L^-1，成垢离子总量为163.80 mg·L^-1，与原有工艺相比，精卤中残留碳酸根离子的浓度降低了32%，成垢离子总量降低了30%，减少真空制盐过程CaCO₃结垢物的形成，真空制盐生产周期由原来的66 d延长至85 d，实现长周期运行。卤水净化过程中产生的沉淀物分析测试结果表明其主要成分为方解石型碳酸钙和少量氢氧化镁。

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	郑三强
	罗兴国
	李兴彬
	魏昶
	邓志敢
	李旻廷

关键词：真空制盐；卤水净化；成垢离子；钙镁脱除

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.

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

Received 2021-03-05;

Fund:云南省科技计划科技入滇专项（20181B030）；昆明市科技计划重点项目（2018-1-H-17215）；云南省教育厅科学研究基金项目（2021Y1117）

Corresponding Authors: 李兴彬,教授,E-mail:lixingbin2018@163.com Email: lixingbin2018@163.com

About author: 郑三强(1996-)，男，硕士研究生，现从事冶金化工方面的研究

引用本文:

郑三强, 罗兴国, 李兴彬, 魏昶, 邓志敢, 李旻廷.真空制盐两碱净化过程成垢离子的脱除及控制[J]. 化学工业与工程, 2022,39(1): 58-65

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, 2022,39(1): 58-65

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