Magnesite is a magnesium carbonate, its chemical formula is magnesium carbonate (MgCO3), theoretical composition: MgO47.81%, CO252.19%, density 2.9–3.1g/cm3, hardness 3–5. Magnesite can be divided into two types: crystalline and amorphous according to its crystallization state. Crystalline magnesite is rhombohexahedral, columnar, plate-like, granular, dense, soil-like and fibrous, etc. It often contains calcium and manganese isomorphs. Fe2+ can replace Mg2+ to form magnesite (MgCO3 ).
My country has abundant reserves of magnesium resources. The proven reserves of magnesite are 3.642 billion tons, accounting for 28.85% of the world’s total reserves, ranking first in the world. Among them: 3.571 billion tons of crystalline magnesite reserves, accounting for 98.05% of the country’s total reserves, and 71 million tons of aphanitic magnesite reserves, accounting for 1.95%, so it is of great significance to the development and utilization of magnesite.
Tibet Mag used differential thermal analysis to study the decomposition of magnesite, and determined the temperature for calcining magnesite accordingly. The x-ray diffraction analysis pattern and activity of calcined products obtained by different calcination temperatures and calcination times were studied, and the effects of calcination temperature and calcination time on the properties of magnesite obtained by magnesite decomposition were discussed, and the optimal calcination conditions of magnesite were obtained.
Siderite (FeCO3) complete isomorphic series. Amorphous magnesite is a…
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