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Topic: Calcination

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Limekiln

Kiln

Calorimeter

Plaster

Quicklime

Standard molar entropy

Soluble

Calorimetry

Enthalpy

Potassium carbonate

Gypsum

Ammonia

Standard enthalpy change of formation

Standard state

Chemical formula

	Calcination - Wikipedia, the free encyclopedia
		Calcination is the process of heating a substance to a high temperature, but below its melting or fusing point, to bring about thermal decomposition or a phase transition in its physical or chemical constitution.
		Calcination reactions may include thermal dissociation, including the destructive distillation of organic compounds (i.e., heating a highly carbonaceous material in the absence of air or oxygen, to produce solids, liquids, and gases).
		In alchemy, calcination was believed to be one of the 12 vital processes required for the transformation of a substance.
	en.wikipedia.org /wiki/Calcination (421 words)

	Calcination: Purification by Fire.
		In the Arcanum Experiment, Calcination is represented by sulfuric acid, which the alchemists made from a naturally occurring substance called Vitriol.
		Calcination is usually a natural humbling process as we are gradually assaulted and overcome by the trials and tribulations of life, though it can be a deliberate surrender of our inherent hubris gained through a variety of spiritual disciplines that ignite the fire of introspection and self-evaluation.
		Calcination begins in the Base or Lead Chakra at the sacral cup at the base of the spine.
	www.alchemylab.com /calcination.htm (237 words)

	Calcination
		Calcinations is the process of subjecting a substance to the action of heat, but without fusion, for the purpose of causing some change in its physical or chemical constitution.
		The objects of calcination are usually: (1) to drive off water, present as absorbed moisture, as "water of crystallization," or as "water of constitution"; (2) to drive off carbon dioxide, sulphl11' dioxide, or other volatile constituent; (3) to oxidize a part or the whole of the substance.
		The furnaces used for calcining substances vary much in their construction, but there are three general classes: muffle, reverberatory, and shaft furnaces or kilns.
	www.lenntech.com /Chemistry/Calcination.htm (754 words)

	Modelling the Calcination of Limestone in a Solar Furnace (Site not responding. Last check: 2007-10-20)
		Derive a model for the calcination of limestone under one-dimensional heating by solar radiation.
		Calcination of limestone is an important chemical reaction that is vital to a number of industries, but it is also a significant contributor to the enhanced greenhouse effect.
		The burning of fossil fuels in addition to the unavoidable carbon dioxide emissions during the reaction of limestone in the cement and lime industries combine to contribute 5% of the world's anthropogenic carbon dioxide emissions.
	www.chemeng.adelaide.edu.au /research/reports/solar_furnace (368 words)

	Factors Affecting the Quality of Quicklime
		The density of limestone and its crystal structure are somewhat related.The shape of the crystals determines the void space between crystals, and thus, the density of the limestone.
		Calcination is done either with low temperature and high residence time, or high temperature and low residence time.
		As CO is released from limestone during calcination, the concentration of CO in the kiln atmosphere is increased.
	www.cheresources.com /quicklime.shtml (4344 words)

	calcination on Encyclopedia.com
		CALCINATION [calcination], in metallurgy, process of heating solid material to drive off volatile chemically combined components, e.g., carbon dioxide.
		Beneficiation of apatite rock phosphates by calcination: effects on chemical properties and fertiliser effectiveness.
		UAE: Project feasibility study for proposed $100,000,000 to $120,000,000-coke calcination plant was expected to be concluded in May 2002 and include a project partner search, DUBAI INVESTMENTS (DI) [UAE] - Order #: 0610502.
	www.encyclopedia.com /html/c1/calcinat.asp (355 words)

	The Seven Stages of Alchemical Transformation - First Stage - Calcination
		CALCINATION is the first of seven major operations in the alchemy of transformation.
		Chemically, the Calcination process involves heating a substance in a crucible or over an open flame until it is reduced to ashes.
		Physiologically, the Fire of Calcination can be experienced as the metabolic discipline or aerobic activity that tunes the body, burning off excesses from overindulgence and producing a lean, mean, fighting machine.
	www.deeptrancenow.com /exc3_calcination.htm (312 words)

	Method and apparatus for the production of coaldust - Patent 4236886
		It is known that to operate a calcination installation with the greatest possible economy, for the production of cement clinker, at least a part of the heat requirement of the calcination stage is provided by means of additional heating in the area of this calcination stage.
		The output of the blower 20 is an exhaust port for the calcination installation and the inert gas sucked off of the exhaust gas conduit 53 is conducted through a conduit 21 to a charging side 22 of a tube mill 23.
		And finally, the position of the grinding installation in direct vicinity of the calcination stage, results in the possibility of operating the mill, partially at least, as an injection-direct-feeding mill for possible additional calcination points in the area of the calcination stage, whereby the calcination process may be optimized and controlled in advantageous manner.
	www.freepatentsonline.com /4236886.html (3964 words)

	Gypsum - Wikipedia, the free encyclopedia
		Temperatures as high as 170°C are used in industrial calcination, but at these temperatures the anhydrite begins to be formed.
		In a fire the structure behind a sheet of drywall will remain relatively cool as water is lost from the gypsum, thus preventing (or substantially retarding) damage to the framing (through combustion of wood members or loss of strength of steel at high temperatures) and consequent structural collapse.
		Small amounts of calcined gypsum are added to earth to create strong structures directly from cast earth, an alternative to adobe (which loses its strength when wet).
	en.wikipedia.org /wiki/Gypsum (937 words)

	Plant and method for regenerating sand from foundry cores and moulds by calcination in a fluidized-bed furnace - Patent ...
		It has already been proposed to use the fumes leaving the calcining furnace in order to heat the sand to be treated at its inlet to the furnace in order to reduce the consumption of the gaseous fuel which must be fed into the calcining bed.
		The purified sand leaves the calcining furnace through the outlet duct 17, passes onto the upper stage 19 of the fluid bed 18 and thence passes through the passage 25 controlled by the shutter 26 onto the lower stage 20 and thence into the discharge duct 27 through the chamber 28.
		The air coming from the duct 21 is thus heated by means of the purified sand leaving the calcining furnace and is then used as the combustion air in the calcining furnace, being made to pass through the inlet duct 7 which communicates with the chamber 22.
	www.freepatentsonline.com /4478572.html (1930 words)

	Nanci Shandera
		As Calcination burns away the ego’s influence by deflating it, we are without the ego’s protection from the unknown.
		The essential task in Calcination is to surrender to it, learn from it and allow it to burn away the barriers and obstacles to our wholeness.
		After Calcination, the ego’s rigid control is released temporarily, and we may become aware of underlying fears of the unknown, of feeling too much, or of expressing ourselves.
	www.themessenger.info /archive/NovDec2002/NanciShandera.html (1219 words)

	Personal Alchemy Quiz - Unexplained Mysteries Discussion Forums
		In the laboratory, it is the heating of a substance in the fire until all that is left is a pile of white ashes.
		Psychologically, Calcination is the destruction of the leaden center of consciousness, which is the ego and all the illusions and self-deceptions it maintains to protect or enshrine itself.
		During Calcination, you use the flames of consciousness to burn through illusion, self-deception, defense mechanisms, bigotry, and all the other dogmas and dramas of the Tyrant Ego that has usurped the throne of the transpersonal Self, who is the rightful ruler of the personality.
	www.unexplained-mysteries.com /forum/index.php?showtopic=27575 (6791 words)

	Project Background Info (Site not responding. Last check: 2007-10-20)
		Calcination is the final stage in the Bayer Process, used to extract alumina from bauxite.
		In Calcination, high temperatures are used to dry aluminium hydrate into alumina, which is a fine white powder.
		The three calciners will be fitted with 'baghouses' (similar to large vacuum cleaner bags) to eliminate all visible dust emissions.
	www.qal.com.au /calciners/background/BG_fact_sheet.htm (332 words)

	AllRefer.com - calcination (Metallurgy And Mining: Terms And Concepts) - Encyclopedia
		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.
	reference.allrefer.com /encyclopedia/C/calcinat.html (210 words)

	A Brief History of Plaster
		Throughout the centuries, expertise was gained in many parts of the World with gypsum calcinations.
		In the 1700's, Paris was already the "capital of plaster" ("Plaster of Paris") since all the walls of wooden houses were covered with plaster, as a protection against fire.
		Controlling some critical calcination parameters is essential to master the growth of the plaster crystals.
	www.artmolds.com /ali/history_plaster.html (643 words)

	Calcination (Site not responding. Last check: 2007-10-20)
		The resulting filter cake is fed to a series of calcining units - an 1800 tonnes a day circulating fluidised bed calciner or one of nine rotary kilns each 100m long and 4m in diameter.
		The feed material is calcined to remove both free moisture and chemically-combined water.
		Rotary or satellite coolers are used to cool the calcined alumina from the rotary kilns, and to pre-heat secondary combustion air for the kilns.
	www.qal.com.au /a_process/process4.html (187 words)

	ASC 2004: Technical Program (Site not responding. Last check: 2007-10-20)
		In this method, it is necessary to control heating conditions of both calcination and crystallization processes, in order to obtain the superconducting films with high critical current density (JC).
		In the present work, we have investigated the effects of heating rates in calcination process on microstructures of YBa2Cu3O7-y(Y123) precursor films and final films, which were formed by advanced MOD method using trifluoroacetates(TFA).
		It is important to optimize the heating rate during the calcination with considering that a high deposition rate should be attained through all the processes in the advanced TFA-MOD.
	www.ascinc.org /asc04/Format.asp?paperNumber=1MK01&Category=2 (266 words)

	Alchemy Journal Vol.2 No.1
		Calcination, over which the ego has no control, makes us feel like all we hold dear is threatened.
		In an alchemist’s laboratory, Calcination involves heating a substance until it is reduced to ashes.
		Calcination is only the beginning of the creation of a healthy, productive, supportive ego structure.
	www.alchemylab.com /AJ2-1.htm (8356 words)

	Preparation and Characterization of Li1-xNi1+xO2 Powder Used as Cathode Materials
		The FTIR spectra of the precursors and the calcined powder are shown in Figure 3.
		The concentration of CO is decreased with an increase in the calcination temperature.
		C calcination was kept constant and the time was varied between 14 and 48 h, the maximum and minimum intensity ratios are shown in Figure 8.
	www.azom.com /Details.asp?ArticleID=3024 (2463 words)

	TAPPI -- leading technical association for the pulp, paper, and converting industry.
		Effects of mud washing and calcining temperature on lime properties, Journal of Pulp and Paper Science, June 2003, Vol.
		We determined the combined effects of mud washing and calcining conditions on the properties of reburned lime and lime-mud.
		Whatever the degree of mud washing was, an important residual fraction of water-insoluble sodium remains in the mud.
	www.tappi.org /index.asp?pid=27141 (191 words)

	Optimization of calcination conditions on the Bi-2223 kinetic formation and grain size
		The effects of the calcination conditions (time, temperature, intermediate milling) on the kinetics of formation of Bi-2223 and on the grain size were studied using a powder precursor synthesized by the polymer matrix method.
		The grain size and the kinetics of formation of Bi-2223 strongly depend on the calcination conditions and thus on the phase assemblages formed at the end of the calcination that determines the reactivity during sintering.
		The higher the calcination temperature is the larger the grain size.
	stacks.iop.org /0953-2048/13/602 (277 words)

	Lavoisier tin calcination: teaching notes (Site not responding. Last check: 2007-10-20)
		Reference: Antoine Lavoisier, "Memoir on the calcination of tin in closed vessels and on the cause of the gain in weight which this metal acquires in the operation,"
		The explanation of combustion, calcination, and respiration in terms of oxygen is surely the best known of Lavoisier's important contributions to chemistry.
		Lavoisier also was a key figure in a group of French scientists who revised the language of chemistry, introducing a systematic nomenclature whose terms were supposed to convey information about the substances to which they were applied.
	web.lemoyne.edu /~giunta/classicalcs/lavoisiernote.html (488 words)

	Fused Glass Former Evaluation in the 5" Cylindrical Induction Melter (Site not responding. Last check: 2007-10-20)
		A series of crucible tests were conducted to investigate the cause of the severe bed expansions during recovery from an interlock during the calcination phase of the process [14].
		When cullet is used as the glass former, recovery from a calcination interlock results in a severe bed expansion [14].
		The fused glass former process mitigated expansions during recovery from an interlock that occurs during the calcination phase of the heat cycle.
	sti.srs.gov /fulltext/tr2000162/tr2000162.html (1890 words)

	Timeline
		Calcination is the process of converting Limestone (or marble or chalk) CaCO3 to Lime CaO by means of heat.
		The change in weight of a substance during combustion or calcination was due entirely to its reaction with oxygen.
		For the proponent of PT, the release of Phlogiston is observed in combustion and calcination, and the measure of its actual negative weight or positive lightness in a substance is attainable by weighing that substance before and after combustion or calcination.
	www.sethi.org /phlogiston/data/timeline.html (5589 words)

	Temperature-Programmed Reduction Study on Calcination of Nano-Palladium (Site not responding. Last check: 2007-10-20)
		Effects of calcination treatment on samples of mono-metallic Pd and Pd -Ag alloy with primary particles around 8 nm were studied with the temperature-programmed reduction technique.
		Temperature profiles of hydrogen consumption for calcined samples from a stream of 10% H
		Two distinct peaks, i.e., a consumption of hydrogen for PdO reduction and a subsequent desorption of hydrogen from bulk palladium hydride, were observed.
	pubs.acs.org /cgi-bin/abstract.cgi/jpcbfk/2001/105/i38/abs/jp011170g.html (232 words)

	021997rf.html
		Calcination is the baseline technology to be used for stabilization of the 28,000 kg of ash-like residues at Rocky Flats.
		This heating, or calcination, is intended to stabilize the residues by eliminating pyrophoric plutonium and unoxidized reactive metals, such as calcium and magnesium.
		The off-gas from the calcination furnaces will be treated in a dry off- gas system containing a sintered ceramic filter and carbon canister.
	www.dnfsb.gov /pub_docs/rfets/sir_19961009_rf.html (2626 words)

	Biringuccio calcination (Site not responding. Last check: 2007-10-20)
		The calcination of lead in a reverberatory furnace seems to me to be such a fine and important thing that I cannot pass it by in silence.
		This is a remarkable thing when we consider that the nature of fire is to consume everything with a diminution of substance, and for this reason the quantity of weight ought to decrease, yet actually it is found to increase.
		We know, as Biringuccio did not, that calcination is really oxidation, the reaction of the metal with oxygen.
	web.lemoyne.edu /~giunta/classicalcs/biringuccio.html (210 words)

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