Efficient Production of High-Purity Magnesium Hydroxide from Serpentinite
Auyeshov A. Arynov K. Yeskibayeva C. Ibrayeva A. Zhumadildayeva A.
September 2025Multidisciplinary Digital Publishing Institute (MDPI)
Molecules
2025#30Issue 17
This article presents a technology for the production of magnesium hydroxide from serpentinite via sulfuric acid leaching of magnesium and purification of the resulting sulfate solution from impurity metals using thermally activated serpentinite (TA-SP) at 750 °C for one hour. Purifying the leach solution is one of the key challenges in obtaining high-purity magnesium compounds from serpentinite. It has been established that the use of thermally activated serpentinite to neutralize the acidic suspension of serpentinite to pH 8.3, prior to treatment with an alkaline agent (sodium hydroxide), has a positive effect on the purity of the precipitated magnesium hydroxide. The influence of the thermal treatment on the acid–base properties of serpentinite, its phase composition, and adsorbent structure parameters, such as specific surface area and micropore distribution, was studied, revealing improvements in the adsorption properties. Flowcharts for the acid leaching and magnesium hydroxide precipitation processes are provided. The flow-sheet that we propose is shown to reduce the number of steps in the process and amount of equipment required for the purification of sulfate solution while ensuring that the magnesium hydroxide product has a purity of at least 99.5%.
energy efficiency , magnesium hydroxide , magnesium sulfate , resource efficiency , serpentinite
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Scientific Research Laboratory “Applied Chemistry”, M. Auezov South Kazakhstan University, Tauke-Khan St. 5, Shymkent, 160012, Kazakhstan
LLP “Institute of Innovative Research and Technology”, 8th Microdistrict, Building 28, Apt. 2, Almaty, 050010, Kazakhstan
Scientific Research Laboratory “Applied Chemistry”
LLP “Institute of Innovative Research and Technology”
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