The invention discloses a method for producing
humic acid and salt thereof through the
oxidative degradation of young lignite. The method comprises the following steps: carrying out the oxidation reaction of the lignite containing the
humic acid and aqueous
hydrogen peroxide solution; after the reaction, obtaining
water soluble fulvic acid through
centrifugal separation, supernatant
filtration, concentration and
drying; adding alkali into the
fulvic acid to prepare a
fulvic acid salt product; carrying out the alkaline extraction and
centrifugal separation of the residue deposit of the production of the fulvic acid, adding acid into the supernatant till the pH value is 1 to 2, carrying out a reaction at an increased temperature or
room temperature, carrying out
centrifugal separation after the reaction is finished, and obtaining purified ulmic acid after
precipitation and
drying; and directly concentrating and
drying the supernatant in the previous step to obtain the humate. The method can improve the yield of the fulvic acid and total
humic acid in the young lignite, and simultaneously increase the
active group in the humic acid. The method can be used for producing fulvic acid, fulvic
acid salt, ulmic acid and ulmic
acid salt products. In particular, the method puts an end to the environmental
pollution caused by the
nitric acid which is taken as an oxidation degradation agent. In addition, the method has a short technological line, low cost, simple requirements on equipment, and moderate conditions. The method which can be applied to the industrialized production has good application prospect.