抄録
In the present study, we developed a technology to produce iron phosphate, which is a cathode material for lithium iron phosphate batteries, by using the slag produced from the double-slag refining process (DRP® slag), that is a by-product of a new resource-saving and environmentally friendly steelmaking process used by JFE Steel Co. We demonstrated that iron phosphate could be obtained from this DRP® slag using the following two methods. First, we treated DRP® slag using our developed wet treatment process, which is a combination of processes consisting of acid-dissolution, alkali-precipitation, a second acid-dissolution, and ion exchange, to obtain an aqueous solution of phosphoric acid. Iron nitrate was then added to this aqueous solution to obtain iron phosphate. We also found that when DRP® slag was treated using our newly developed wet-treatment method, the resultant solid was iron phosphate.
