18 19This paper gives an introduction to MTDATA, Phase Equilibrium Software from the National Physical Laboratory (NPL), and 20 describes the latest advances in the development of a comprehensive database of thermodynamic parameters to underpin 21 calculations of phase equilibria in large oxide, sulphide and fluoride systems of industrial interest. The database, MTOX, has 22

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This review critically evaluates the factors affecting the process of slag splashing. Two mechanisms are involved in slag splashing, namely 'slag wash coating' and 'slag ejection coating'. Our knowledge of slag splashing is largely based on physical modelling studies. It is necessary to optimise the following for good slag splashing:(ii) The characteristics of the nitrogen blow (Gas flow, Lance height, Lance angle, Slag depth); and (iii) Slag composition. It is important that the slag contains the right blend of low-melting and high-melting phases. The low-melting (FeO-rich) phases ensure good adhesion between the slag and refractory whereas the high-melting phases provide erosion resistance and a thermal barrier. Good slag properties are obtained with a FeO content of ca. 13 % and MgO should be supersaturated (Ͼ8 % MgO) to ensure that the slag is MgO-saturated rather than CaO-saturated so that high-melting MgO · Fe 2 O 3 is formed rather than the low-melting calcium ferrites.The factors affecting the uniformity of the slag-splashed layer are discussed.

Equations have been derived to calculate values of the thermophysical properties of all stainless steels for temperatures between 300 and 1 800 K (austenitic 3 series, ferritic-4 series and precipitation-hardened 6-series alloys). Values of the following properties are given in both figures and tables: density (r), thermal expansion coefficient (a), heat capacity (C p ), enthalpy (H T ϪH 298 ), thermal conductivity (l) and thermal diffusivity (a), electrical resistivity (R), viscosity (h) and surface tension (g).KEY WORDS: stainless steels; thermo-physical properties; density; surface tension; viscosity; heat capacity; enthalpy; thermal and electrical conductivity.