Abstract
In the this publication, readers will find the results of the analytical and experimental research into the physical and chemical processes in the consecutive formation of structures at the major technological stages of the present-day production of portland cement. Dispersed systems of raw mixtures, which in different methods of production are formed at the stage of grinding, mixing and homogenization of raw materials, belong to different classification groups. In wet and combined methods is produced cement sludge - aqueous dispersed system, which belongs to the 2nd group: two-phase systems such as solid dispersed phase - liquid dispersion medium. In the dry method dispersed system is formed, which belongs to the 3rd group: three-phase systems such as solid dispersed phase - water-liquid and air-gas dispersion medium. The structural-mechanical and rheological properties of the coagulation structure of cement slurries, wich differ in the main raw material components, are shown. The study of deformation processes of aqueous dispersed systems showed that the nature of the development of deformations - rapid elastic ε<sub>0</sub>’, slow elastic ε<sub>2</sub>’ and plastic ε<sub>1</sub>’τ sludge samples belong to different structural - mechanical types. At the same time differences in quantitative values and a ratio of the specified types of deformation are noted. Readers will also find the particularities of the phase changes in the process of the crystallization structure formation at baking to maximum temperature 1450°С.
Highlights
The technology of cement production is developing in the direction of expanding the raw material base with the involvement of waste from other industries as man-made raw materials, mechanization and increasing the productivity of equipment, reducing specific energy consumption during firing and grinding [1–3]
In wet and combined methods due to grinding, mixing, homogenization of a mixture of raw materials with water is produced cement sludge - aqueous dispersed system, which belongs to the 2nd group: two-phase systems such as solid dispersed phase liquid dispersion medium
Features of formation of coagulation structure of cement sludge in technological process are defined by stages: interaction of a surface of particles of components of a dispersed phase with the water dispersion environment → change of chemical-mineralogical and granulometric structures at joint grinding of carbonate and clay components and mineral additives → partial destruction and change of external characteristics. during transportation → increase in concentration of a dispersed phase at partial ab intense dehydration in the rotary kiln
Summary
The technology of cement production is developing in the direction of expanding the raw material base with the involvement of waste from other industries as man-made raw materials, mechanization and increasing the productivity of equipment, reducing specific energy consumption during firing and grinding [1–3]. The urgency of these tasks is enhanced in modern conditions, when ensuring the competitiveness of the cement industry requires increased production efficiency, addressing resource conservation and ecology on an innovative basis This necessitates the development of physico-chemical bases of binder technology, based on the concept of the relationship "composition structure - properties"
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