| 摘要 |
FIELD: agriculture.SUBSTANCE: method of production of water-soluble humic acids which includes drying of brown coal with a content of humic acids of at least 50%, crushing the brown coal, processing the crushed coal with the alkaline reagent, and brown coal before crushing is dried to a residual moisture content of no more than 20%, after crushing it is divided into fractions : more than 10 mm, 4-10 mm, 2-4 mm, 0.5-2.0 mm and less than 0.5 mm; fractions of more than 10 mm and 4-10 mm are returned for recrushing, fractions of 2-4 mm or less than 0.5 mm in the solid phase are processed with dry alkaline reagent with intensive stirring while maintaining the temperature in a range 40-80° C; the fraction of 0.5-2.0 mm is dispersed with intensive stirring in softened water and processed with an aqueous solution of an alkaline reagent while maintaining the pH of the reaction mixture in the range of 10.0-10.5 and the temperature in the range of 40-80° C, the solution obtained as a result of the reaction is purified from water-insoluble substances by centrifugation, the solution is concentrated by vaporisation under discharging with the residual pressure of 5000-6000 Pa and the temperature of 50-60° C, and then dried in a fluidised bed at the temperature of 130-140° C.EFFECT: waste-free production of water-soluble salts of humic acids.1 dwg, 1 ex |
