The invention relates to a method for preparing
calcium magnesium phosphate fertilizer through
cyclone furnace process by using
phosphorite floatation
tailings as raw materials, in particular to a method for preparing
calcium magnesium phosphate fertilizer through adopting a
cyclone furnace by using
phosphorite floatation
tailings as main raw materials, belonging to the technical field of
phosphate fertilizer chemical industry. The method uses the
phosphorite floatation
tailings as the main raw materials and adopts the
cyclone furnace to prepare
calcium magnesium phosphate fertilizer, and comprises the following steps: (1) the phosphorite floatation tailings are used as the raw materials, pulp
dry basis contains 8-12 percent of P2O5 by weight percent, tailing filter cakes are obtained through treatment and the tailing filter cakes contain 20-40 percent of water; (2) the tailing filter cakes obtained through the step (1) are dried to tailing power containing water less than 2 percent by using a dryer, and the required grain size of tailing
powder is that more than 80 percent of particles can pass through a 100-mesh
sieve; (3) other primary phosphorite,
coal, serpentine stone and silica to be jointly calcined are metered, mixed, cracked and crushed into joint-
calcination mixed
powder with
fineness that more than 80 percent of particles can pass through the 100-mesh
sieve; (4) 100 parts of phosphorite
raw material, 190-280 parts of pulverized
coal, 0-10 parts of silica and 0-20 parts of serpentine stone
powder are added in the
cyclone furnace by weight; and (5) the calcined powder
raw material obtained through the step (4) is used to prepare
calcium magnesium phosphate fertilizer by adopting the
cyclone furnace. The invention has the advantages that the source of the raw materials is wide and the cost is low;
sulfuric acid and
phosphoric acid are not consumed, the product quality is reliable, the use is economic and feasible, and the social benefit is remarkable.