5. Reactors for solids processing

Reactions between a fluid (mainly a gas) and a solid play a major role in materials production technology: metallurgy, cements, combustion, refractories, etc. Typical examples are the reduction of iron oxides, the roasting of pyrites and the combustion of coal. Typical examples are the reduction of iron oxides, the roasting of pyrites and the combustion of coal.

Although these various applications present a great diversity of cases, a certain number of common points can be identified to serve as a basis for the choice and design of reactors adapted to the problems to be addressed [10][11] .

The chemical reaction can be represented by different diagrams, such as :