Oxidation of brown coal of Angren deposit with a mixture of nitric and sulfuric acids
M. O. ZhumanovaInstitute of General and Inorganic Chemistry, Uzbekistan Academy of Sciences, Tashken, UzbekistanN. Kh. UsanboevInstitute of General and Inorganic Chemistry, Uzbekistan Academy of Sciences, Tashken, UzbekistanШ. С. НамазовInstitute of General and Inorganic Chemistry, Uzbekistan Academy of Sciences, Tashken, UzbekistanB. M. BeglovInstitute of General and Inorganic Chemistry, Uzbekistan Academy of Sciences, Tashken, Uzbekistan
ABI
Abstract
Oxidation of brown coal of Angren deposits by a mixture of nitric and sulfuric acids was studied in respect of dependence on the concentration of nitric acid (5–30%), concentration of sulfuric acid in nitric acid solution (2.5–20%), and temperature (40–80°C) at the process duration 2 h and the ratio of coal: HNO3 = 1: 2. Optimal conditions of the process in terms of maximum yield of humic acids and the minimum loss of nitrogen oxides were found.
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