SOLVING RAW MATERIAL CHALLENGES

摘要

A comprehensive understanding of the chemical and physical aspects of raw material transformation intornclinker is an important foundation to increasing production, reducing costs, and improving quality at therncement plant. Clinker formation relies on numerous kiln feed properties and pyroprocessing conditions.rnUnderstanding the influential properties of the feed (chemistry, fineness, uniformity, and mineralogy) canrnlead to improvements in its burnability and therefore in the efficiency of plant operations. The paperrndiscusses clinker formation, its relation to kiln feed properties, and the importance of optimizingrnburnability by careful mix control, good mix homogeneity, and tailoring the burning process to the raw mix.rnThe burnability and kiln feed are discussed in relation to specific fuel consumption.rnWhen the raw materials available make it hard to achieve burnability goals, the use of fluxes and/orrnmineralizers may be helpful. Fluxes and mineralizers indirectly affect burnability by promoting clinkerrnphase formation to occur earlier; their effect on clinker formation and cement quality is briefly described.rnFluoride-containing compounds have proven to be the most effective mineralizers in cement clinkeringrnreactions. However, an excessive amount of fluoride may delay cement setting time.rnEmphasis is placed on the effects of changes in raw material burnability and clinker formation on kilnrnoperations, finish mill productivity, and the properties of the resulting cement.