VIGIL-ESCALERA GUIRADO, Alfonso. Los primeros paisajes altomedievales en el interior de Hispania: Registros campesinos del siglo quinto d. C. Universidad del País Vasco. Bilbao: 2015, 348 pp.

The injection of non fuel materials (iron ores, fluxs, slags, ilmenite sands), siderurgical wastes, plastics, and others, both in single form and in mixture with pulverized coal, is analyzed. As the characteristics of the injected materials, variations in the operation of blast furnace can be introduced.