Abstract: In order to efficiently remove potassium chloride present in the magnesia-iron-aluminum spinel bricks used in cement kilns, and realize the industrial applications of refractory materials used in cement kilns, this article mainly uses different acid solutions such as nitric acid, formic acid, oxalic acid, and citric acid to soak the bricks for cement kilns, and explores the effect of different acid solutions on the removal of potassium chloride in the bricks for cement kilns. Through the analysis of the sample composition, phase composition and microscopic surface scan analysis after treatment, it was found that the acid solution is beneficial to the diffusion and dissolution of potassium chloride, and the organic carboxylic acid can accelerate the potassium chloride’s hydrolytic ionization and promotes the removal of potassium chloride. The citric acid solution has the best effect of removing potassium chloride. The materials treated by the citric acid solution meet the standard requirement that the chloride (calculated as chloride ion content) in the national standard for light aggregates is not more than 0.02%, and the treated materials can be reused in industrial production.
贾小东, 田琳, 高伟, 陈树江, 李国华. 基于酸浸法去除水泥窑用后砖中氯化钾的研究[J]. 材料导报, 2021, 35(11): 11034-11038.
JIA Xiaodong, TIAN Lin, GAO Wei, CHEN Shujiang, LI Guohua. Research on Removal of Potassium Chloride from Brick Used in Cement Kilns by Acid Leaching. Materials Reports, 2021, 35(11): 11034-11038.
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2021, Vol. 35 
