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Selected Aspects of the Assessment of the Quality of Slag

Bydałek A. W., Holtzer M.

Archives of Foundry Engineering

2015

Vol. 15, iss. 1 spec.

9--12

Two approaches have been proposed to analyze the quality of the slag: metallurgical evaluation of and environmental impact assessment. The analysis of the metallurgical quality of the slag using the DTA methods was carried. In the paper a method of determining the reduction capability of slag solutions was used. There are the oxides complexes used in to the slag composition for the purpose to establish two quality indicators in reduction processes: EW - indicator showing the direction and intensity of reaction in to the slag composition and r - indicator of the rate of coal consumption. Proposed to other qualitative criteria. The analysis was conducted on the example of slag from aluminium metallurgical processes, and slag from the smelting processes of copper and its alloys. Divided influence on the environment and the use slag in other processes. Discusses the quality of the slag as a function of their operating qualities. Highlighted the need qualitative assessment of slag in a broad sense. Indicated the necessity to analysis including the quality of the slag more criteria, including: - technology - suitability for further processes, - operational, environmental and economic benefits.

Interactions between liquid slag and graphite during the reduction of metallic oxides

Migas P., Karbowniczek M.

Archives of Metallurgy and Materials

2010

Vol. 55, iss. 4

1147-1157

High global demand for metallic elements such as Fe, Cr, Ti, Mn leads to an intensive technological development of metal recovery. One of the ways is to recover metals from metallurgical slag. The sessile drop method was adopted in order to study the interactions between liquid slag and graphite. Steelmaking slag was used during this research. The slag used included converter slag and slag from chrome steel melting as well as their mixtures with other modifiers. The analysis covered six types of slag in the temperature ranging from 1100°C to 1600°C in the argon atmosphere. In the course of research mass spectrometry and scanning microscope were used. The following were set for the examined samples during the reduction process: liquidus temperature and the nature of interactions (wettability or its lack). It was observed that the volume of slag samples dynamically changed in the course of the reduction of metallic oxides.

Duże zapotrzebowanie dzisiejszego Świata na pierwiastki metaliczne np. Fe, Cr, Ti, Mn, powoduje bardzo intensywny rozwój technologii ich odzysku m.in. z żużli metalurgicznych. Przy użyciu techniki leżącej kropli wykonano badania współoddziaływania ciekłych żużli z grafitem. Do badań wykorzystano żużle stalownicze: konwertorowy i z wytopu stali chromowych oraz ich mieszanin z innymi modyfikatorami, analizie poddano sześć żużli w zakresie temp 1100-1600°C w atmosferze argonu. W badaniach wykorzystano również spektrometr masowy oraz mikroskop skaningowy. Określono temperaturę liquidus dla analizowanych próbek, jak również charakter interakcji - zwilżanie lub jego brak - w trakcie trwania procesu redukcji. Zaobserwowano dynamiczne zmiany objętości próbek żużlowych w trakcie zachodzenia procesu redukcji tlenków metalicznych.