| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of a phosphate fertilizer capable of obtaining a fertilizer at low cost having excellent quality, by utilizing phosphorus included in sewage.SOLUTION: A production method of a phosphate fertilizer B2 comprises the step of calcining sewage sludge S9 generated in a sewage treatment facility and a calcium source A2 using an exist melting furnace 16. The calcination is performed at a calcination temperature of 1150°C or more and 1350°C or less, and a coke bed furnace, a swirling melting furnace, or a surface melting furnace is used as the melting furnace 16. |
