Development of Technology for Obtaining Bayerite from Kaolin Clays from the Chashma-Sang Deposit in the Republic of Tajikistan

Abstract

The article presents the results of research on the technology of alkaline treatment of a sulfate-containing solution consisting mainly of aluminum and iron sulfates using sulfatization of kaolin clays from the Chashma-Sang deposit in order to obtain aluminum hydroxide. The laboratory is studying the process of alkaline treatment of a sulfate-containing solution depending on temperature, process time, sodium hydroxide concentration and caustic modulus.It is established that at a temperature of 85 °C, a process time of 30 minutes, a concentration of sodium hydroxide of 10 % and a caustic modulus of 3.0, the degree of extraction of sodium tetrahydroxoaluminate into the solution is more than 99 %, precipitation of iron hydroxide is more than 98 %, and the remaining amount of impurity aluminum hydroxide in the iron hydroxide composition is 0.9 %. Carbonation of a solution of sodium tetrahydroxoaluminate produces aluminum hydroxide, in which the content of Al(OH)₃ is more than 99 %. X-ray phase analysis revealed that the resulting aluminum hydroxide corresponds to the mineral bayerite (file number PDF 74-1119). According to the results of the physico-chemical analysis, the obtained aluminum hydroxide meets the requirements of GOST 11841--76 for technical aluminum hydroxide and TU 1711-001-00658716--99. Based on laboratory studies, a basic technological scheme for processing kaolin clays from the Chashma-Sang deposit in order to obtain aluminum hydroxide is being developed. In accordance with the results of the conducted research and the developed technological scheme, the technology of sulfatization of kaolin clays and alkaline treatment of a sulfate-containing solution to obtain a pilot amount of aluminum hydroxide is being tested in the JSC "Tajik Aluminium Company" gas treatment shop

The work was carried out with the financial support of JSC "Tajik Aluminium Company"

Please cite this article in English as:

Naimov N.A., Mirsaidov U.M., Mirpochaev Kh.A., et al. Development of technology for obtaining bayerite from kaolin clays from the Chashma-Sang deposit in the Republic of Tajikistan. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2025, no. 1 (118), pp. 137--151 (in Russ.). EDN: GHXQYF

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