Thermal Transformations of the Technogenic Component of the Cement Raw Material Mixture

Abstract

There are presented the results of physicochemical studies of the composition and thermal transformations og large-tonnage wastes of beneficiation of scarnified-magnetite ores from Kazakhstan. To determine the composition of materials and thermal transformations, the following methods were used: X-ray phase analysis, differential-thermal analysis, Mцssbauer and infrared spectroscopy. There was revealed the stepwise nature of the transformation of anthropogenic material during roasting, due to polymineral composition of ore beneficiation. It has been established that the chemical-mineral characteristics of natural silicates determine the formation processes and properties of clinker phases. An integrated approach to the study of technogenic raw materials allowed not only to substantiate the possibility and expedience of using scarnified-magnetite ore beneficiation wastes in cement production, but also to determine the preference for the phase composition of cement clinker. Research result from the basis for the development of low-energy cement clinkers with a high content of belite phase.

Environmental Aspects of Resource-Saving Cement Technology

“…The silicate base of the mineral composition, the content of clinker-forming oxides, the presence of non-carbonate lime, the presence of alloying and modifying elements precluded the possibility and feasibility of using DMS tailings in the production of Portland cement clinker [14].…”