Calcination: Heat treatment carried out in a stream of air or inert gas at very high temperatures is called calcination or roasting. Calcination is the process of thermal dissociation or crystal transformation of natural or artificial compounds; At this point, the compound dissociates into simpler compounds or undergoes a crystalline transformation by heating. The thermal decomposition of carbonate is called roasting. Calcination operations can be used to directly process mineral raw materials to suit the requirements of subsequent processes, and can also be used in chemical beneficiation post-treatment to prepare chemical concentrates to meet user requirements for products.
The main physical and chemical changes in the calcination process of high-temperature furnaces are: thermal decomposition. It is mainly to remove volatile impurities such as chemically bonded water, CO2, NOx, etc. At higher temperatures, solid-phase reactions may also occur in oxides to form an active compound state. Recrystallization yields tiny crystal forms, crystal sizes, pore structures, and specific surface areas. Sinter microcrystallites appropriately to increase mechanical strength.
The main factors affecting the calcination process of high-temperature furnaces are: calcination temperature, gas phase composition, thermal stability of compounds, etc. Therefore, according to the thermal stability of various compounds, such as carbonates, oxides, hydrogen hydroxides monosulfide, oxygenates, etc. By controlling the calcination temperature and gas phase composition, the composition of certain compounds can be selectively changed. Crystal form transitions occur and appropriate methods are used to remove impurities and isolate and enrich useful genes.
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