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Topic: Cement kiln

	Cement Kiln Dust Wastes \| Wastes \| US EPA
		Cement kiln dust (CKD) is the fine-grained, solid, highly alkaline waste removed from cement kiln exhaust gas by air pollution control devices.
		Cement kiln dust is one of the wastes exempted.
		Cement kiln dust is included as one of the six special wastes.
	www.epa.gov /epaoswer/other/ckd/index.htm (1591 words)

	Fcb ciment : cement industry, mineral grinding equipment, machinery manufacturer, cement plant supplier
		Fcb ciment is fully dedicated to the cement industry and to the mineral grinding applications, offering a wide range of equipment, from the spare part to the turnkey plant, thanks to a double expertise of Turnkey General Contractor and Process Mechanical Equipment Supplier.
		cement manufacturing equipment Fcb ciment is fully dedicated to the cement industry and to the mineral grinding equipment.
		From the spare part (revamping, rotary kiln alignment) to the turnkey cement plant, thanks to a double expertise of Turnkey General Contractor and Process Mechanical Equipment Supplier.
	www.fcb-ciment.com /EN/toc.asp (886 words)

	Cement kilns - preheater - precalciner - long cement kiln - waste to energy recycling (Site not responding. Last check: 2007-10-17)
		Cement kilns are enormous cylindrical ovens, some as long as 1000 feet and as much as 24 feet in diameter.
		The kiln is fueled by powdered coal, oil, gas, or liquid waste-derived fuel in the burner end and solid waste-derived fuels in the center or calcining zone via Cadence's patented process.
		Preheater and precalciner kilns are shorter than a long cement kiln and contain tall preheater towers that use the heat produced by the kiln to preheat the raw materials as they move through the various stages of the tower.
	www.temarry.com /Cement%20Kilns/Cement_Kiln2.htm (349 words)

	#314 (12/02/92): Cement And Kiln Dust Contain Dioxins (Site not responding. Last check: 2007-10-17)
		Cement kiln dust is a byproduct of cement manufacture and is routinely given or sold to farmers as a soil treatment, or is discarded into pits or is piled on the ground near cement kilns in an uncontrolled fashion.
		Cement kiln dust has previously been reported to contaminate groundwater with the toxic metals lead and chromium,[1] but until now no one has reported dioxins, furans, plutonium or cesium-137 in cement or cement kiln dust.
		Cement is a key raw material in concrete pipe for water delivery systems, and in concrete block and other concrete materials used in construction of private homes, commercial dwellings, public buildings, bridges and highways.
	www.monitor.net /rachel/r314.html (1325 words)

	Patent 5123739
		An apparatus for monitoring the firing condition of a clinker in a kiln, in accordance with claim 1, wherein said processor is connected to a process computer which controls, the revolution of the kiln, and the feed rate of materials to the kiln, through the value of said degree of radiation absorption or emission.
		In an ordinary cement kiln, there are sodium and potassium atoms vaporized between the firing zone and the kiln hood, which atoms emit the radiation, and then the line spectrum of the radiation is measured.
		While the cement kiln was operated at very low revolution rate, with little supply of the materials to nearly stop the movement of the material in the kiln, the radiation from the kiln was detected or measured to result in emission intensity at the potassium lines.
	www.freepatentsonline.com /5123739.html (3623 words)

	What is a cement kiln? (Site not responding. Last check: 2007-10-17)
		A typical cement kiln is a huge cylindrical furnace 12 to 25 feet in diameter and 450 to 1,000 feet in length.
		Kilns are set on a slight incline and rotate from one to three revolutions per minute.
		Cement kilns can process up to 200 tons of raw materials such as limestone, clay, and sand per hour.
	0-www.deq.state.ne.us.library.unl.edu /Newslett.nsf/9d6f473384f9022086256fb800613a71/bbe6591db83d369386256fb9006342e4?OpenDocument (197 words)

	NETL/CCTC: Cement Kiln Flue Gas Recovery Scrubber - Summary
		This CKD, representing about 10% of the cement feedstock otherwise lost as waste, is formed into a water-based slurry and mixed with the flue gas as the slurry passes over a perforated tray that enables the flue gas to percolate through the slurry.
		Waste cement kiln dust, exhaust gases (including waste heat), and wastewater are the only inputs to the process.
		Renovated cement kiln dust, potassium-based fertilizer, scrubbed exhaust gas, and distilled water are the only proven outputs.
	www.netl.doe.gov /cctc/summaries/pass/cemkilndemo.html (1472 words)

	Waste Glass - User Guidelines - Granular Base (Site not responding. Last check: 2007-10-17)
		Fresh cement kiln dusts can be classified as belonging to one of four categories, depending on the kiln process employed and the degree of separation in the dust collection system.
		There are two types of cement kiln processes: wet-process kilns, which accept feed materials in a slurry form; and dry-process kilns, which accept feed materials in a dry, ground form.
		These stockpiles are usually located relatively close to the cement and lime manufacturing plants, and vary in age and composition, with exposure to the elements (moisture in particular) reducing the chemical reactivity of the dusts.
	www.tfhrc.gov /hnr20/recycle/waste/kd1.htm (2319 words)

	Danes burn fingers on cement kiln project (Site not responding. Last check: 2007-10-17)
		Controversy is growing over a Danish funded project to convert a cement kiln in Mozambique for the incineration of obsolete pesticides.
		However, emission controls are less sophisticated on cement kilns than on dedicated toxic waste incinerators and there is a risk that seriously hazardous pollutants such as dioxins will be emitted.
		Advocates of cement kilns claim that the higher incineration temperatures (up to 2000°C in cement kilns; around 1200°C in dedicated incinerators), longer residence times of the waste at those temperatures and the emission controls which are in place prevent the formation and emission of dioxins or other pollutants.
	www.pan-uk.org /pestnews/pn41/pn41p16b.htm (409 words)

	Deputy PM pulls plug on cement kiln
		In those localities with access to quality infrastructure and materials, vertical kilns will be upgraded to reverter kilns with designed capacities of between 700 and 1,000 tonnes of clinker produced daily.
		In 2003, the domestic cement industry produced 23.2 million tonnes of cement, 16.8 of which was produced by vertical kilns.
		The Sai Son Cement Plant in Ha Tay Province and the Dong Ha Cement Factory in Quang Tri Province have been awarded the title of Heroic Unit for their contributions to the national construction and renovation.
	vietnamnews.vnagency.com.vn /2004-04/21/Stories/06.htm (293 words)

	Patent 4584179
		A cement kiln dust treating apparatus including a reaction chamber for receiving kiln dust, nozzles in an upper region of the reaction chamber for atomizing and discharging spray to the kiln dust, mixing blades for mixing the dust in contact with the spray, and a pelletizer for pelletizing the mixed and contacted kiln dust product.
		It is a further object of the present invention to provide kiln dust processing apparatus of the type described in the preceding paragraph including means for passing gas through the reaction chamber for reacting the dust with the gas and fog.
		The medial chamber opening 43 provides for the introduction of waste cement kiln dust to the interior of the chamber 30, which dust may be introduced continuously during the process, or intermittently.
	www.freepatentsonline.com /4584179.html (2408 words)

	Cement Process Engineers, Cement kiln process trouble-shooter
		Loesche vertical roller mills for raw and cement grinding.
		Kiln uses Orimulsion (coal in emulsion with water) as fuel.
		Responsibility for process design during the feasibility stage of upgrading a long dry kiln to preheater / precalciner, and upgrading of a 100% by-pass precalcining kiln to 30% by-pass.
	www.cement-process.com /postlecv.htm (1547 words)

	Sources of PCDDS/PCDFs in Cement Kiln Emissions.
		Kiln "A" is a large pre-heater precalciner kiln that utilizes hazardous waste fuel.
		Kiln "B" and "E" are large long wet kilns that utilize hazardous waste fuel.
		Kiln "C" and Kiln "D" are moderately sized long wet kilns that do not utilize hazardous waste fuel.
	www.environmental-expert.com /articles/article23/article23.htm (1806 words)

	Kiln Accessories / Firing Supplies
		Kiln shelf scraper, Stilt mark cleaning stone, Peep Hole Plugs,
		A protective coating for kiln shelves and other areas inside the kiln that may be subjected to dripping glaze during firing.
		Mix this dry kiln wash with water to a creamy consistency and apply with a brush to the top side of the kiln shelves.
	www.bigceramicstore.com /Supplies/KilnFurniture/KilnFurnitureIndex.htm (601 words)

	BBC NEWS \| Wales \| North East Wales \| Cement kiln remains closed
		Castle Cement in Padeswood was ordered to stop using one of its kilns in March following a breach of emission limits for dioxins.
		The kiln was due to close shortly anyway to make way for the new fourth kiln which is expected to come into operation on a trial basis in June.
		The kiln is designed to run on Cemfuel, a controversial concoction of waste solvents and chemicals - which protesters fear will pollute the environment.
	news.bbc.co.uk /go/newsFeedXML/moreover/-/1/hi/wales/north_east/4492941.stm (287 words)

	Kiln Online Direct cement kiln dust (Site not responding. Last check: 2007-10-17)
		Sometimes when you're trying to find top-quality information relating to cement kiln dust, you'll find it hard separating superior advice from unprofessional cement kiln dust suggestions or help so it is wise to recognize how to judge the information you are offered.
		A great tip to pursue when you are presented with information and suggestions on a cement kiln dust page is to research who is behind the website.
		This may divulge who is behind the site cement kiln dust integrity The easiest way to work out who is at the back of the cement kiln dust website is to look on the 'contact' page or 'about this site' information.
	www.kiln-online.info /cement-kiln-dust.htm (244 words)

	Cement Kiln Dust (Site not responding. Last check: 2007-10-17)
		As this mix passes through the kiln, burning fuel is forced into its lower end, causing the temperature to rise to 1400-1650° resulting in the formation of cement clinker.
		Upon cooling and pulverizing of the clinker, cement kiln dust is removed.
		While the bulk of this dust is recycled into the cement manufacturing process (this amount is limited by the necessity of respecting alkali levels in the kiln), a significant amount of Cement Kiln Dust (CDK) is removed as industrial waste.
	www.trinitystone.com /5b%20Kiln%20Dust.htm (116 words)

	Effective Temperature Control for Cement Kiln Off-Gases
		As many of the fuels used in kilns today have increasingly high sulfur levels, temperatures must be kept above the sulfuric acid dewpoint so as to prevent corrosion in the ductwork, towers, baghouses or electrostatic precipitators (ESP).
		Monitoring of two or more of these variables allows the operator to troubleshoot nozzles in operation to ensure that proper drop size is being achieved at all times and with all sprays.
		A 4500 ton/day cement manufacturer was having wetting problems in the cooling towers ahead of his electrostatic precipitator.
	www.cheresources.com /cementkiln.shtml (1675 words)

	Heavy Metal Outputs (Site not responding. Last check: 2007-10-17)
		Measured data from a kiln equilibration tests are analyzed for heavy metal outputs from a cement kiln co-fired with hazardous waste fuels.
		Measured concentrations of arsenic, beryllium, cadmium, chromium, and lead in wasted kiln dust, at the highest intended hazardous waste feed rates to the kiln, are 68, 10, 72, 18, and 68 times those predicted for feed rates with no hazardous waste.
		If metals are assumed not to accumulate in the kiln, the intermediate metal concentrations in cement clinker are predicted to be substantially higher than those at the final steady state.
	www.civeng.rutgers.edu /water/abstracts/hmoutput.htm (217 words)

	Earthjustice: Urgent Cases: Cement Kiln Emissions
		EPA’s own estimates reveal that the cement kiln industry emits approximately 5 tons of mercury, 580 tons of organic HAPs, and more than 15,000 tons of hydrogen chloride each year.
		The cement kiln industry operates facilities in thirty-seven states spanning every region of the country.
		Cement kilns release toxins during the cement manufacturing process, which involves burning both fossil fuels and various types of waste-derived fuels.
	www.earthjustice.org /urgent/display.html?ID=227 (260 words)

	Rising From The Ashes:What is claimed to be the world's largest cement kiln precipitator was rebuilt in record time ...
		Operators at the plant were bringing the kiln on-line when a crack in the shell was discovered.
		The subsequent shutdown to allow the rewelding of the shell took approximately 24 hours, during which time a light preheat flame was kept in the kiln to maintain the temperature of 200 degrees F (93 degrees C) already obtained in the preheat.
		The fire apparently occurred when the kiln was restarted after the repair causing extensive damage to the collecting plates and the discharge electrodes.
	cementamericas.com /mag/cement_rising_asheswhat_claimed/index.html (808 words)

	Public - Organizations - GEC - Cement Kiln
		Tire Burning in Cement Kilns - Part I(750K) Communities for a Better Environment in the San Francisco area arguments against the Kaiser Cement Company for burning tires in their cement kiln.
		Downwinders At Risk- a Texas-based group dedicated to ending kiln incineration of hazardous waste at the TXI Midlothian, Texas cement plant.
		The National Citizens Alliance (NCA) - a coalition of grassroots environmental groups from communities in 18 states where cement or aggregate companies are burning or proposing to burn hazardous waste in their kilns.
	www.greenlink.org /gec/cement.html (529 words)

	Cement Kiln Dust (Site not responding. Last check: 2007-10-17)
		The EPA has excluded cement kiln dust from the hazardous waste regulations of the RCRA regulations since the 1980s.
		The general consensus met by the EPA and industries that produce and utilize cement kiln dust is that CKD is a non-hazardous material as long as it is handled properly, and necessary precautions are always taken.
		Landfills for the disposal of cement kiln dust must be designed and continually managed to meet EPA standards.
	useit.umeciv.maine.edu /regulations/ckd_reg.htm (318 words)

	Kiln Online Direct cement process kiln (Site not responding. Last check: 2007-10-17)
		When you are trying to find better-quality advice concerning cement process kiln, you'll find it's complex sorting out quality information from misguided cement process kiln suggestions and directions so it is sensible to know how to qualify the information you are often given.
		A good hint to pusue when you're presented with help or advice concerning a cement process kiln web page is to ascertain who owns the site.
		This may show you the people behind the site cement process kiln identifications The easiest way to work out who is at the back of the cement process kiln web site is to find the sites 'about' page.
	www.kiln-online.info /cement-process-kiln.htm (232 words)

	rotary cement kiln (Site not responding. Last check: 2007-10-17)
		Method of converting a rotary kiln cement making plant to a calcining furnace cement making plant United States Patent 4260369 View Patent Images...
		Cement Kiln Burners rotary iron ore pelletizing cement limestone...
		80 percent of the joint venture's kilns would be the superior rotary kiln by the end of 2006, which will enable it charge a premium for better quality cement.
	rotary.33all.info /rotary-cement-kiln (441 words)

	National Citizens Cement Kiln Coalition-Welcome
		The National Cement Kiln Coalition was founded as a result of repeated requests from citizens living near cement kilns for organizing and technical expertise.
		The organizations in the coalition have each participated in or are currently active in a cement kiln struggle.
		The National Citizens Cement Kiln Coalition is a coalition of grassroots environmental groups from communities across the United States where cement or aggregate companies are burning or proposing to burn hazardous waste in their kilns.
	www.downwindersatrisk.org /DownwindersAtRisk-NCCKCWelcomeToTheNationalCitizensCementKilnCoalition.htm (137 words)

	Infrared linescanner improves cement kiln performance. - Hub4
		With the kiln operating at up to 500 degrees C and an ambient temperature of around 45 degrees C, collecting readings was an extremely difficult task for the operating and maintenance engineers.
		Linescanning heads are normally used to monitor the shell temperature of a cement kiln, scanning a section from a distance of around 30 to 40 metres.
		Of the three versions offered, the LSP62 is the most appropriate for kiln applications, covering temperatures from 100 to 600 degrees C. It is sufficiently compact to be installed where space is limited, and has a sapphire protection window for added durability.
	www.hub-4.com /news/151/infrared-linescanner-improves-cement-kiln-performance (895 words)

	Kilns, potters wheels, bisqueware, Mayco Glaze & more!
		For use during kiln firing-- stays strong in extreme heat over long periods of time.
		For use with kiln firing, stamen wire is designed to be used for decoration, jewelry, and armatures.
		Tough and durable, these gloves are convenient for handling hot kiln lids and raku tongs and protect hands at very high temperatures.
	www.clay-king.com /equiplist.htm (773 words)

	ATSDR - Health Consultation - Cemex, Incorporated, Lyons, Boulder County, Colorado
		They requested CEMEX expand the planned stack test of its kiln emissions to analyze for a more extensive list of chemicals and conduct a risk assessment to determine if any health effects were possible in the community due to emissions from burning TDF.
		To change the time that the materials are in the kiln or change the mixing and turbulence that occurs in the kiln would take a major modification of the facility, such as, the design of the kiln, its length or diameter, the angle of incline or speed of rotation.
		Because the kiln operating conditions that make good cement also cause good combustion, there is unlikely to be a wide variation in the stack emissions from a cement kiln while using the same fuel and raw materials.
	www.atsdr.cdc.gov /HAC/PHA/cemex/cem_p1.html (5689 words)

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