| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for recovering a raw material for a slag phosphatic fertilizer by concentrating the content of POin dephosphorization slag to a level of "not less than 3.0% citric acid-soluble phosphoric acid" with an easy and low-cost method.SOLUTION: A method of recovering a raw material for slag phosphatic fertilizer containing not less than 3.0% citric acid-soluble phosphoric acid from dephosphorization slag which is generated in dephosphorization treatment of hot metal, includes carbonation-treating dephosphorization slag while introducing the slag into water in which carbon dioxide gas is dissolved and agitating it to elute the 2CaO/SiOphase in the dephosphorization slag, recovering a solid residue, and then repeating the operation of the carbonation treatment of the solid residue multiple times. The phosphorus is recovered from the treatment water subjected to the treatment at least twice. |
