Abstract：Circulating cooling water in the iron and steel industry accounts for 70%-80% of industrial water consumption. It is mainly used in factories to condense steam and cool products or equipment. Facing the increasingly serious shortage of water resources in China, increasing the circulation rate of the water treatment system, reducing the new water index per ton of steel, and increasing the concentration multiple of the circulating cooling water system are one of the important water-saving technologies. With the increase of the concentration ratio, chloride ions could continually concentrate, which greatly aggravates the risk of intergranular corrosion of equipment and pipelines, affects normal production and shorten the service life of equipment, and even leads to personal safety accidents. Therefore, it is an inevitable choice to remove chloride ions from circulating water in the iron and steel industry. Experts and scholars at home and abroad have devoted themselves to studying the removal of chloride ions in various types of waste-water, forming four major types of chlorine removal technologies, namely precipitation salt method, separation method, ion exchange method, and oxidation-reduction method. In addition to their advantages, these technologies also have some shortcomings. The articles describe different chloride ion removal technologies and their mechanism of action, and compares and analyzes their advantages and limitations in the removal of chloride ions in water, highlights the advantages of the lime aluminum salt precipitation method, and proposes a process technology for the removal of chloride ions in circulating water in the iron and steel industry. At the same time, this also provides a new idea for the continuous concentration of chloride ion removal problems. It is believed that the technology of removing chloride ions from water will become more and more perfect in the future, and it will also play an increasingly important role.
张晓英, 李素芹, 雷海萍, 李永奎. 钢铁工业循环水中氯离子脱除工艺技术探讨[J]. 钢铁, 2022, 57(3): 153-159.
ZHANG Xiao-ying, LI Su-qin, LEI Hai-ping, LI Yong-kui. Discussion on removal of chloride ion from circulating water in iron and steel industry[J]. Iron and Steel, 2022, 57(3): 153-159.
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2022, Vol. 57 
