Extraction of Phosphorus from Dephosphorization Slag
In Japan, steelmaking slag is one of the most important secondary phosphorus (P) resources. The annual amount of P removed into steelmaking slag (c. 114 kt P/a) is approximately 2.8 times more than that of P imported as phosphate (Pi) rock to Japan. Increasing attention has been paid to P recovery from dephosphorization slag for mitigating the Japan’s dependency on P import. This chapter describes the smelting reduction technology for extracting P from dephosphorization slag into iron. The potential of this technology has been examined using a pilot-scale test furnace having the capacity to treat dephosphorizing slag at 2 t/day. P could be extracted from dephosphorization slag, forming Fe-P alloy with the P content of approximately 10 wt%.
KeywordsDephosphorization slag Smelting reduction process P extraction Fe-P alloy
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