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 major trend is that phosphorus solubility in all 3 extractants increased as calcination temperature increased up to the maximum calcination temperature of 1000[degrees]C.
2] emissions reduction realized in alternative calcination.
In the second reaction, the so-called calcination reaction, CaC[O.
Meanwhile, eggshell containing most of CaO composition after the calcination process is a suitable material to be used as a catalyst.
the counter effects of synthesis parameters, including hexane additive, hydrothermal temperature, synthesis temperature and calcination method has also been studied on the structure and final performance of the product.
Influence of calcination temperature on leaching rate of aluminum and iron impurities in oil shale ash.
Products, which are not blends, result from solid-state synthetic reactions that take place under calcination conditions; and include lemon yellows, blues, greens and black.
A post-treatment like calcination and sintering is usually necessary to create roughness on the coating surface.
which consists of 8 packages--package I for Jetty & Facilities, package II for: Belt Conveyors, package III FeNi Plant-1, package IV Ore Preparation & Calcination, package V Ladle Furnace, package VI Electric Smelting Furnace, package VII Oxygen Plant and package VIII a coal-fired power plant.
Mesut Sahin, MD for the German Technip, said: "This contract follows the successful completion of the process design package for this new coke calcination unit for Takreer last year.
Technip has won a "significant" contract comprising technology, engineering services and supply of core equipment for Abu Dhabi Oil Refining Company's (Takreer) new coke calcination unit.
Meanwhile, calcination at a temperature above 1250 degrees Celsius transforms the hydrated aluminum chloride into aluminum oxide (alumina), ready for sale.