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 ?
The samples were recorded as the CaAl-x-y, where x and y meant the calcination temperature and carbon black dosage, respectively.
In addition, depending iron oxides formed during the sample calcination, the acid-base properties can be modified [12, 13].
The coloration of pigments obtained at different calcination temperatures was evaluated by the CIELAB colorimetry or the [L.sup.*][a.sup.*][b.sup.*] colorimetric parameters.
Completion of the calcination process facility was marked at a ceremony attended by Riita Swan, the Finnish Ambassador to the UAE, EGA's managing director and chief executive officer Abdulla Kalban, and Kalle Harkki, executive vice president , Metals, Energy & Water of Outotec, the Finnish minerals and metals technology company that is the main contractor on the calcination process facility.
The influence of calcination temperature on the iron removal was studied in the temperature range of 500-1000 [degrees]C with holding time 2 h.
The shape of periclase in LHC clinkers was mostly polygonal or circular with clear boundaries, and it did not vary with calcination conditions changing.
Calcination. Figure 5(e) showed the TGA thermograms of the RC3 granule with and without silica coating where silica-coating condition was fixed to be at a concentration of TEOS, ammonia, and deionized water and reaction time of 0.13 M, 1.0 M, 2.0 M, and 2 hr, respectively.
It was used to optimize the calcination temperature and time in the experimental domains described in Table 1.
Subsequently, the sample was subjected to 15 carbonation-decarbonation cycles, where a cycle consists of 15 min of carbonation at 923 K with pure C[O.sub.2] flow (50 mL [min.sup.-1]) and 10 min of calcination at 1 073 K in [N.sub.2] (50 mL [min.sup.-1]) with a heating and cooling rate of 10 K [min.sup.-1].
Soft modeling methods based on neural network, support vector machines, and subspace method were used to predict the output index, the calcination temperature, and tail temperature of the kiln, respectively [9-11].
The efficient mixing of a pozzolanic material in OPC is a consequence of the calcination of an industrial waste [13].
At the same time, standards are also rising for the pigments used.The CICPs, manufactured in a high-temperature calcination process (above 800[degrees]C/1500[degrees]F),meet these rising quality standards while taking ecological issues into account.