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Use of alternative raw materials
for cement clinker production
Dr. T. Roppelt, Rohrdorfer Zement, Rohrdorf,
Dr. W. Dienemann, HC Technology Center GmbH, Leimen,
Prof. Dr. R. Klaska, HeidelbergCement AG, Werk Enningerloh,
I. Leth, Karsdorfer Zement GmbH, Werk Sötenich,
Th. Sievert, Dyckerhoff AG, Wiesbaden, Germany
At the end of the eighties of the last century a looming, long-term scarcity of raw materials and increasing environmental awareness initiated a rethinking process that led to new priorities in waste management. Numerous laws, directives and regulations have now been enacted with the aim of minimizing the consumption of raw materials, energy and ground and maximizing the re-use of materials. For the cement industry this resulted in a social contract for sustainable material and thermal utilization of waste materials in order to conserve natural resources and -reduce the quantities deposited in landfills. A large number of materials are available for use as replacements for raw materials or as correction materials. The types of waste materials that could be used have to be assessed on the basis of the facilities at the individual sites. However, the use of secondary materials must not have any detrimental effects on the process or the product quality. Confirmed availability, a material quality that is as uniform as possible and an efficient quality management system contribute substantially to the successful use of secondary materials.
Summary CEMENT INTERNATIONAL 01/2006 pp 54-63
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