The invention discloses a
humic acid compound
fertilizer spraying, granulating and
drying process and granulating and
drying equipment. The
humic acid compound
fertilizer spraying, granulating and
drying process comprises the steps that lignite is crushed into 60-80 mesh particles, then water and dilute alkali liquor with the concentration of 2% are added,
coal, alkali and the water are added into a mixing dissolving tank, the ratio of the
coal to the alkali to the water is 100: 6: 400, steam is introduced, when the temperature reaches 80 DEG C, the temperature is controlled to be 80 DEG C, and heat preservation is performed for 1 hour; S2,
slurry is pumped into a
settling tank for
settling for not less than 24 hours so as to fully settle insoluble impurities, after
settling is finished, liquid containing
humic acid on the upper layer is pumped, the liquid is pumped into a filter tank for filtering and filter pressing treatment, and impurities and insoluble substances in a humic acid
aqueous solution are removed by utilizing a filtering and filter pressing method. According to the humic acid compound
fertilizer spraying, granulating and drying process and the granulating and drying equipment, the problems that traditional monoammonium
phosphate spraying, granulating and drying equipment is not suitable for humic acid compound fertilizer, and
continuous production is difficult are solved, particle breaking and
softening deformation caused by high temperature are avoided, and a good effect is achieved.