Adiabatic Calculations: Material Enthalpy

Frozen-in global equilibrium calculation at T = 700 °C, taking the resulting enthalpy at the actual initial material temperature. This corresponds to a frozen-in microstructure. At initial material temperatures above 700 °C the equilibrium is instead calculated directly.

Mechanical mixture between the enthalpy of the gas components. This is no limitation because all gas components in the databases are assumed to be ideal gas.

• Mechanical mixture: If the temperature is below T=1000 °C and every single material component (such as MgO, CaO, …) is fully solid at the requested material temperature, mechanical mixture is assumed. This means that the enthalpy of every component is calculated separately and summed up (weighted by mass fraction). This corresponds to the assumption that different separate components have been added to the slag (such as burnt lime and magnesite). If any component forms gas or liquid at the initial material temperature, this mode is not used. Note that mechanical mixture is also applied if pure elements are added to the slag material, i.e. it is not the same in respect to the material enthalpy to define CaO and Ca + O.
• Equilibrium: If no mechanical mixture of the material components is possible or if the temperature is above T=1000 °C. This corresponds to the assumption of a fully homogenized slag material.