Thermochemical data required for heat balances

This article provides steelmakers with all the thermochemical data they need to establish heat balances in pyrometallurgy, and in particular in steelmaking.

The data comes from the most recent compilations, and in particular from the Thermochemical Data Bank files used at IRSID's Maizières-lès-Metz test station.

These data, expressed in the units of the International System (SI), are for the most part presented in the form of computer-generated tables.

This text brings together the following data:

• enthalpy variation of pure bodies (elements and compounds) between 25 °C and t °C ;

• temperature and enthalpy variation of phase transformations of pure bodies ;

• enthalpy of formation of compounds at various temperatures ;

• enthalpy of dissolution of elements in liquid iron.

In addition, a section is devoted to the presentation of thermochemical data for complex industrial bodies of particular importance to the steel industry: liquid and solid slags, solid, liquid and gaseous fuels, metallurgical coke and solid and liquid pig iron.

Finally, concrete examples of the use of data in the steel industry are discussed.

The heat balance of a process is one of the most important steps in the study of an industrial reactor. The tables below contain the thermochemical data needed to perform heat balance calculations in pyrometallurgy, and more specifically in steelmaking.

These data are expressed as enthalpy variations of the system under consideration during temperature rises or chemical reactions. The values are taken from the Thermodata thermochemical database and other thermochemical compilations available in the literature .

In the first part of this article, the system studied consists...