Nitric Acid Processing of Serpentenites from the Karakalpak Deposit
G.D. SAPAROVA1, B.KH. KUCHAROV2, M.S. DZHANDULLAEVA3, A.U. ERKAEV3, B.S. ZAKIROV2
1Karakalpak Research Institute of Natural Sciences, Karakalpak Branch of the Academy of Sciences of the Republic of Uzbekistan, Nukus, Uzbekistan
2Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan
3Tashkent Institute of Chemical Technology, Tashkent, Uzbekistan
Keywords: magnesium nitrate, serpentinite, processing, nitric acid treatment, fertilisers
Pages: 82-90
Abstract
Physicochemical foundations for the technology of nitrogen acid processing of serpentinite from the Karakalpak deposit with the formation of pure magnesium nitrate and magnesium-containing compound fertiliser are developed. The chemical and mineralogical composition of serpentinite from the Karakalpak deposit is studied. As determined by X-ray diffraction analysis, microscopic and thermogravimetric studies, serpentinite sample contains clinoenstatite, pyrope, spinel, magnetites and other minerals with various crystal structures. Data on the extraction of serpentinite components in nitric acid by decomposition under different conditions (temperature, duration, nitric acid concentration) are presented. The subsequent stages of nitric acid extract processing have been carried out: removal of silica residue, ammonisation of the filtrate in order to precipitate undesirable impurities to obtain magnesium nitrate. The process of evaporation and crystallization of the filtrate to obtain pure magnesium nitrate has been studied.
DOI: 10.15372/CSD2024534
EDN: XLJLKN
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