<報文>高炉スラグからの硫黄の溶出防止に関する研究

概要

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Sometimes yellow-colored and corrosive water was generated from ironmaking slags when using in road construction. The yellow-colored water contains polysulfide ions which are generated by the following reactions : K_2S(or CaS in slag)+H_2O=2K^+(or Ca^<2+>)+HS^-+OH^- 2HS^-+O_2=2S+2OH^- (1-x)S+HS^-=Sx^<2->+H^+ For the protection of the generation of yellow-colored water from ironmaking slags, it is necessary to convert sulfide into insoluble form or to prevent the formation of elemental sulfur in the slags. All of iron works in Japan carry out the aging treatment in which ironmaking slags are weathered for one to three months to oxidize sulfide in slags. It has been seen from the state analysis of sulfur compounds that elemental sulfur also dissolved out as polysulfide ions during the aging treatment. Sulfides in the slags are converted into insoluble ferrous sulfide by an addition of iron-bearing materials when the basicity of slags (CaO/SiO_2 ratio) is lower than 1.1.
東北大学の論文
1984-02-29