PHASE CHANGES OF QUARTZ-PYROPHYLLITE ROCK OF BOYNAKSAY DEPOSIT BY THERMAL INFLUENCE

X-ray studies have established that as a result of the thermal impact on the quartz-pyrophyllite rocks of the Boynxaksa deposit, the decomposition of the pyrophyllite phase begins at temperatures above 600 °C. The formation of the mullite phase is fixed at 1200 °C. The phase of cristobalite appears at 1300 oC and begins to prevail over the content of quartz at 1400 °C

Peculiarities of mullite formation during heat treatment of shale from the Jerdanak deposit

The chemical and mineralogical composition of the clay slate of the Dzherdanak deposit is determined. Four species were investigated in the natural and heat-treated state in the range of 800-1400 °C using the X-ray method. Established phase changes undergoing breed. The phase composition of the original rock, intermediate substances during roasting up to 1400 oC has been determined. The initial phases in all varieties are quartz and mica of different composition. One variety contains kaolinite. The main phases formed during high-temperature processing are mullite, quartz and cristobalite. The structure of natural and heat-treated samples was studied by scanning electron microscopy. The sizes of mullite crystals are in the range of 3.5 to 0.15 μm, depending on the type of rock. For the three varieties of shale C-1, C-2, and C-3, amorphous regions are separated, separated by a lighter bounded phas

Features of crystallization of a bioactive alkali free glass

In this work, bioactive alkali free glass was synthesized in the RO-CaF2-P2O5-Al2O3-SiO2 system and the results of crystallization of glass in the temperature range 700-1000 °C were investigated. The glass microstructure, phase composition and structural changes of crystallized glass by powder X-ray diffraction and IR spectroscopy were studied. The effect of temperature on the phase composition of the resulting glass-ceramic material and their amount is established. At 700 °C, fluorapatite is formed with a small amount of anorthite. With an increase in the crystallization temperature, anortite and vitlocite become the main phases, and fluorapatite is present in smaller quantities

Phase changes in crystallization of some glasses synthesized in the RO-CaF2-P2O5-Al2O3-SiO2 system

The aim of the relearn was to study the phase changes during crystallization of some compositions of biocompatible glasses obtained in the RO-CaF2-P2O5-Al2O3-SiO2 (R=Zn, Mg) system. For this purpose, crystallization of glasses in the range of 700-1000 °C was carried out and X-ray analysis was carried out. A change in the phase composition of crystallized glass with a change in crystallization temperature and composition has been established. During crystallization, the phases of whitlockite, zinc-substituted fluorapatite, fluorapatite, anorthite, and gahnite were identified