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Recycled materials in cement . In 2006, the cements manufactured by Lafarge had an average additive content of 23%. These additives were of natural origin, such as limestone and volcanic rock, or industrial origin, for example blast furnace slag (a steel industry byBioglycerol use in cement manufacture - Aggregate Research,Researchers show that it is possible to employ bioglycerol as a multipurpose grinding additive for the manufacture of cement, with better performance than pure glycerol, reports Decoded Science in article by Clara Piccirillo. Bioglycerol, or crude glycerol, is impure glycerol obtained as a by-product in the biodiesel industry.Crusher, Grinding Mills, Crushing,- Mining & World Quarry,Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of minerals.