Dissolution of Chromium from Steelmaking Slag–Cr-containing Mineral Phases and Synthetic Slags–
Takayuki Iwama, Shigeru Ueda, Ryo Inoue
Steelmaking slags are reused for civil engineering and roadbed materials. When the slag containing Cr oxide is reused, there is a slight case of toxic Cr6+ elution from the mineral phase containing CrO3 into the environment. Therefore, in order to effectively utilize slag as resources, the development of a technology to suppress Cr elution is urgently required. Regarding the formation of Cr6+ at high temperature and the elution of Cr6+ and Cr3+, many researches have been carried out as functions of the synthesis conditions of mineral phases and slags and elution conditions. Furthermore, the Cr6+ dissolution from actual slags has been reported. In this paper, the studies on the synthesized Cr-containing mineral phase and slags are reviewed, and the research issues of the technology to suppress Cr6+ elution from slag are discussed.
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