METHOD OF PRODUCING WATER-SOLUBLE HUMIC ACIDS Russian patent published in 2012 - IPC C05F11/02 

FIELD: chemistry.

SUBSTANCE: invention relates to agriculture. The method of producing water-soluble humic acids from caustobioliths of the coal family, which involves exposing caustobioliths to a potassium or sodium hydroxide solution with concentration of 2.0-4.0 wt %, separating the liquid phase, treating the liquid phase with acid, followed by separation in a centrifugal force field and separating the heavy phase, treating the obtained heavy phase with a hydroxide of alkali or alkali-earth metals until obtaining a ready product, wherein the caustobioliths are subjected to attrition with a potassium or sodium hydroxide solution to obtain particles with size of 250-5 mcm in amount of not less than 90 wt %, wherein the heavy phase is also subjected to attrition with a hydroxide of an alkali or alkali-earth metal until achieving pH 3.5-5.0.

EFFECT: invention increases output of humic acids while maintaining their natural state and cutting the duration of the process.

5 cl, 6 dwg, 5 tbl, 18 ex