METHOD OF PRODUCING FERTILIZER FROM POULTRY DUNG Russian patent published in 1998 - IPC

FIELD: organic fertilizers (versions). SUBSTANCE: crude dung is crushed and dried in fluidized bed using inert carrier with grain size 4-6 mm and varied velocities of gas-air stream, namely: 6-8 m/s in crushing step and 3-5 m/s in drying step. The two steps are conducted at 110-170 C and, as inert carrier, glass and/or corundum grains are utilized. In another embodiment of invention, the two operations are conducted simultaneously using inert carrier with grain size 8-14 mm at temperature 110-170 C. Inert carrier in the latter case is haydite and/or pumice from blast-furnace or open-hearth furnace slag. EFFECT: achieved environmental safety of fertilizer. 4 cl