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Leaching studies of magnesite using perchloric acid thermochemical and electrochemical treatment of magnesium chloride

Ramesh Naidu Mandapati, Venkata Swamy Nalajala, Naga Jyothi Kothamasu, Chandanasri Paladugu, Ch. R. V. S. Nagesh, and Tondepu Subbaiah

Department of Chemical Engineering, Vignan’s Foundation for Science, Technology and Research, Vadlamudi, Guntur, India



Received: 8 May 2023  Accepted: 17 October 2023


Natural impurities such iron, sulphates, chlorides, and heavy metals that cannot be removed by recrystallization are present in the magnesia that is formed. One method for making magnesium perchlorate includes combining per chloric acid and magnesite dust, a process that generates a lot of heat and hydrogen gas during the reaction. Magnesite is leached using an aqueous per chloric acid solution with a 500 rpm stirring speed. The following factors were taken into account in this study: fluctuation in leaching temperature (°K), per chloric acid volume percentage, and time of leaching. Magnesium perchlorate recovery is 97.3% with a temperature increase to 333.15 K and 100% with an increase in leaching time to 1 h. Dehydration of magnesium chloride was tried through thermochemical processing with several compounds and the results are not encouraging. Experimental studies have also been carried out on the electrochemical preparation of magnesium hydroxide from magnesium chloride.

Keywords: Magnesite; Perchlorate; Leaching; Magnesium hydroxide; Magnesium chloride

Full paper is available at

DOI: 10.1007/s11696-023-03158-8


Chemical Papers 78 (3) 2053–2059 (2024)

Monday, May 20, 2024

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