The invention relates to a medium-trace granular
fertilizer prepared from
phosphate tailings and a preparation method, the medium-trace granular
fertilizer prepared from
phosphate tailings comprises 68-94.8 parts of
phosphate tailings, 3-10 parts of a strengthening auxiliary agent, 1-10 parts of a binder, 1-10 parts of an activating auxiliary agent and 0.2-2 parts of a
micronutrient element material, and a penetrant
aqueous solution is based on 100 parts of the above components. And then adding 4-10 parts of a penetrant
aqueous solution. A preparation method; the method comprises the following steps:
drying the phosphate tailings, ball-milling and crushing to 100-200 meshes; the preparation method comprises the following steps: mixing a
micronutrient element material, a binder, an activating auxiliary agent and a strengthening auxiliary agent, and crushing to 100-200 meshes to obtain a synergist; the phosphate tailing
powder and a synergist are mixed and put into a granulator, a penetrant
aqueous solution with the
mass concentration of 0.1-5% is sprayed according to the proportion,
granulation, screening and
drying are conducted, and the medium-trace granular
fertilizer prepared from the 3-5 mm phosphate tailings is obtained. By adding the penetrant, the requirement on the composition of the phosphate tailings is greatly reduced, so that the medium-trace granular fertilizer prepared from the phosphate tailings has better dissolvability, the preparation cost is low, and the medium-trace granular fertilizer can be applied to large-scale industrial production.