Calumite – an essential raw material for the glass industry
Calumite is a glassy calcium-alumino-silicate, produced from granulated blast furnace slag. Its unique melting and refining properties enable glassmakers to reduce energy consumption and reduce CO2 and NOx emissions while improving glass quality.
Calumite is a granular material that is 99% glassy in nature. It has traditionally been viewed as an alumina source but it is a valuable source of all the major glass making oxides. The particle size distribution ensures it is compatible with other glass making raw materials.
Table 1 typical Calumite chemical composition
|CaO||38 – 44|
|SiO2||36 – 40|
|Al2O3||6 – 14|
|MgO||7 – 10|
|S2 –||0.7 – 0.9|
|Fe2O3||0.15 – 0.3|