calcination


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calcination

(kăl'sənā`shən), in metallurgymetallurgy
, science and technology of metals and their alloys. Modern metallurgical research is concerned with the preparation of radioactive metals, with obtaining metals economically from low-grade ores, with obtaining and refining rare metals hitherto not used, and with the
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, process of heating solid material to drive off volatile chemically combined components, e.g., carbon dioxide. It is sometimes a step in the extraction of metals from ores. Calcination is distinguished from drying, in which mechanically held water is driven off by heating, and from roasting, in which a material is heated in the presence of air to oxidize impurities. Originally calcination meant the method of obtaining lime (calcium oxide) from limestone by heating it to drive off carbon dioxide.

calcination

[‚kal·sə′nā·shən]
(chemical engineering)
A process in which a material is heated to a temperature below its melting point to effect a thermal decomposition or a phase transition other than melting.
References in periodicals archive ?
Calcination at 800 AdegC transformed MnCO3 to Mn2O3 particles, while particle shape integrity retained to a significant extent.
From the Table 3 it is clear that after calcinations the quantity of quartz (raw impurities) was 82.
Non hydraulic / fat lime could be obtained by calcinations of nearly pure Lime-stone.
The new calcination technology guarantees highly efficient process management that is optimized for quality.
4] powder using two different fuels, and by varying the calcination temperature and the calcination time that can be used as oxygen carrier in CLC application.
When calcination temperature increases, the fibers are mainly necklace-like well- crystallized nanofibers.
A possible mechanism was that by calcination of PMMA@Fe[(OH).
2] emissions reduction realized in alternative calcination.
The experimental calcination temperatures established in the rotary kiln were restricted between 750[degrees]C and 940[degrees]C, since according the STA analysis, the dehydroxilation of the kaolinite occurs from 400[degrees]C to 900[degrees]C Due to the formation of particle aggregates during the calcination process, some of the calcinated materials (MK-830, MK-850, MK-900 and MK-940) were submitted to a soft mechanical disaggregation (Table 4).
83) After calcination and conversion to zinc oxide, the size is reported to diminish to 25 nm, calculated by Scherrer equation.
In the second reaction, the so-called calcination reaction, CaC[O.