Thermal transformations in polymineral technogenic cement raw

Abstract

The results of physicochemical studies of composition and thermal transformations of large-tonnage wastes of skarn-magnetite ore dressing in Kazakhstan are presented. To determine materials’ composition of the following methods were used: X-ray, differential and thermal, Mössbauer and infrared spectroscopy. The stepwise nature of transformation of anthropogenic material during firing, due to polymineral composition of ore dressing wastes is revealed. Provides information on the chemical and mineral composition, thermal transformations of ore dressing wastes. It has been established that the chemical-mineral characteristics of natural silicates determine formation processes and properties of clinker phases. The features of the formation of clinker phases with the participation of the technogenic component of the raw mix, which consist in the activity of low-temperature interactions, the variety of intermediate phases are revealed. It has been established that the staging of belite formation with the participation of actinolite, albite, andradite, grossular, diopside, chlorite, epidote is due to gradual transformations of minerals into intermediate phases C2AS, C3MS2, of which C2S is formed at temperatures of 1000-1300oC. Alite formation is intensified due to high-temperature belite formation and doping impurities. Skarn-magnetite ores wastes are an effective cement raw material, providing high-quality portland cement clinker using low-energy and resource-saving technology.

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

“…The chemical composition listed in Table 1 was determined using X-ray diffraction. Pyroxenes, garnets, amphiboles, feldspars, chlorites, epidote, and scapolite dominate the technogenic material [15,23]. Waste also contains pyrite, calcium carbonate, magnetite, and quartz [26].…”

“…The mineral composition of the skarn-magnetite ore dressing wastes was determined by petrographic analysis performed earlier by the authors using equipment from the geological laboratory of the mining and processing enterprise [23]. According to petrographic analysis, the content of minerals in the WMS, %, are: pyroxenes 20-25, garnets 7-12, amphiboles 7-14, feldspars 8-12, chlorites 7-10, epidote 10-13, scapolite Glass breakage (sodium-calcium-silicate) is made up of fragments of sheet glass and glass containers at a ratio of 1:1.…”

“…The description of thermal effects in multicomponent mixtures (Figure 11) is hypothetical in nature and is based on thermal analysis data for individual components of the mixture. The transformations in ore dressing wastes were considered by us in the study [23]. The identification of phases in materials fired in the transformation temperature range using X-ray diffraction patterns is difficult due to the polymineral composition of the mixtures.…”

“…The combination of liquid glass with fillers makes it possible to create materials with a highly porous cellular structure. Physicochemical characteristics of liquid glass provide numerous options for foaming in the technologies of aerated concrete, granules of various sizes and purposes [23]. The technology of porous liquid glass compositions is characterized by low energy consumption.…”