China Nonferrous Metallurgy

In the study, advanced vitrification technology is adopted to achieve harmless treatment of hazardous side-blown smelting ferrous smelting slag. Various proportions of silica were added to control the basicity of the raw materials, and different melting temperatures as well smelting atmospheres were set to prepare glassy products. The results showed that: with the decrease of alkalinity, the vitrification degree of the slag system increased, the hemispheric temperature decreased significantly, the Fe³⁺/Fe²⁺ ratio decreased slightly, and the viscosity increased; meanwhile, when the oxygen partial pressure of the smelting atmosphere decreased, the vitrification degree, the hemispheric temperature and the Fe³⁺/Fe²⁺ ratio of the slag system all showed a decreasing trend; in the range of 1380~1420℃, smelting temperature had little effect on the above comprehensive properties; the vitrification degree, hemispherical temperature and viscosity decreased slightly with the increase of temperature; under the optimal experimental conditions (temperature 1400℃, COCO₂=1∶1, holding time 3h and basicity 0.7), the toxic substances and acid dissolution rate in the glassy products prepared from side-blown ferrous smelting slag were much lower than that of the limited value, and could realize the harmless disposal.