Carbonate ions (CO₃^2–) play a vital role in CaCO₃ scaling. The main goal of the present research was to study the inhibition of CaCO₃ scaling during the vacuum evaporation salt-making process by regulating the doses of NaOH and Na₂CO₃ to promote the utilization efficiency and reaction activity of CO₃^2–, and then to decrease the concentration of scale-forming ions, especially CO₃^2–, in the refined brine obtained from purification via the NaOH-Na₂CO₃ method. The results demonstrate that the employed method not only achieved the improved efficiency of calcium (Ca²⁺) and magnesium (Mg²⁺) ion removal, but also effectively decreased the concentration of CO₃^2– in the refined brine. The total concentration of Ca²⁺ and Mg²⁺ was decreased from 486.1 to 12.3 mg/L, and the concentration of residual CO₃^2– during the brine purification process was 128 mg/L at the optimal doses of NaOH = 0.25 g/L and Na₂CO₃ = 1.3 g/L. The optimal parameters of the NaOH–Na₂CO₃ method were used in industrial production experiments and operated for a production period. The degree of accumulation of CO₃^2– in the circulating feed brine was decreased, and the deposition ratio of CaCO₃ was inhibited effectively. Additionally, the heat-transfer efficiency of the vacuum evaporation system was improved, and the energy consumption level was decreased. Moreover, large NaCl crystals with a narrow particle size distribution were prepared, thereby improving the anticaking property of the crystals. The scanning electron microscopy (SEM) results demonstrate that the surfaces of calcite CaCO₃ were adsorbed by many spherical Mg(OH)₂ particles, and the growth rate of calcite was retarded. Furthermore, the loose structure of the scale layer is beneficial to later cleaning treatment.

碳酸根离子 (CO ₃ ^2- ) 在 CaCO ₃结垢中起着至关重要的作用。本研究的主要目的是通过调节NaOH和Na ₂ CO ₃的用量来提高CO ₃ ^2–的利用效率和反应活性，研究对真空蒸发制盐过程中CaCO ₃结垢的抑制作用，以及然后降低NaOH-Na ₂ CO ₃法提纯得到的精制盐水中结垢离子的浓度，尤其是CO ₃ ^2-。结果表明，所采用的方法不仅提高了钙（Ca²⁺ ) 和镁 (Mg ²⁺ ) 离子的去除，同时也有效地降低了精制卤水中 CO ₃ ^2-的浓度。Ca ²⁺和Mg ²⁺的总浓度从486.1 降至12.3 mg/L，盐水净化过程中残留CO ₃ ^2–浓度为128 mg/L，NaOH 最佳剂量= 0.25 g/ L和Na ₂ CO ₃  = 1.3 g/L。NaOH-Na ₂ CO ₃法的最佳参数用于工业生产实验并运行一个生产期。CO ₃ ^2-的积累程度降低循环进料盐水中CaCO ₃的沉积率，有效抑制CaCO ₃的沉积。此外，提高了真空蒸发系统的传热效率，降低了能耗水平。此外，制备了粒径分布窄的大 NaCl 晶体，从而提高了晶体的抗结块性能。扫描电子显微镜(SEM)结果表明方解石CaCO ₃表面被许多球形Mg(OH) ₂颗粒吸附，并延缓了方解石的生长速度。此外，氧化皮层的松散结构有利于后期的清洗处理。