| 摘要 |
<p>It is intended to provide a method of producing a fertilizer by processing waste matters wherein the processing time can be reduced and the inhibitory effects of sodium and aluminum contained in the fertilizer on the growth of plants can be prevented, in the case of using waste matters containing sodium and aluminum as the starting material for producing the fertilizer. Namely, a method of producing a fertilizer which comprises: the first step of recovering an aqueous ammonia solution (12) from putrid matters (10) containing ammonia; the second step of burning the residue (14) remaining after recovering the aqueous ammonia solution (12) in the first step to give a burned ash (16); the third step of mixing the aqueous ammonia solution (12) with the burned ash (16) to give a mixture (18) and then adding a mineral component (20) to the mixture (18) to give another mixture (22); and the fourth step of adding conc. sulfuric acid (24) and wollastonite (26) to the mixture (22) to give a solidified product (28).</p> |
