METHOD AND APPARATUS FOR PRODUCING PHOSPHATE FERTILIZER UTILIZING INCINERATION ASH

摘要

[PROBLEMS] To provide a method and an apparatus for adjusting the change of the content of a phosphate component, to thereby produce a stable phosphate fertilizer at a low cost. [MEANS FOR SOLVING PROBLEMS] An apparatus for producing a phosphate fertilizer wherein a mixture of a sludge incineration ash as a main raw material and magnesium, calcium, potassium and the like as sub-materials is heated in a melting furnace, the heated product is separated into a molten metal and a molten slag, and then the molten slag is discharged and rapidly cooled, to produce a phosphate fertilizer, which comprises an arithmetic device for following the change in the phosphate concentration based on the measured values obtained by the analysis of the total phosphate concentration, grasping the total phosphate concentration in the incineration ash, and determining the proportion of wastes having a high phosphorus content to be added to the sub-materials, and an addition device for adding, before the melting treatment for raw materials, sub-materials such as a waste having a high phosphorus content to the main raw material in response to the phosphate concentration determined by the output of the above arithmetic device.