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Topic: Bauxite

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In the News (Wed 22 May 19)

  Olympus MIC-D: Darkfield Gallery - Bauxite Ore
Commonly, bauxite is composed of the aluminum-containing minerals gibbsite (or hydragillite), boehmite, and diaspore; iron-containing minerals hematite, goethite, magnetite, siderite, and ilmenite; titanium-containing minerals anatase, rutile, and brookite; and the silicon-containing minerals halloysite, kaolinite, and quartz.
Bauxites contain hydrated forms of aluminum oxide, which vary in the amount of water of hydration, and are usually claylike and earthy.
Bauxite forms most commonly in deeply weathered rocks as a hydrated aluminum oxide ore. In some locations, the parent material is basalt or other volcanic rocks.
www.olympusmicro.com /micd/galleries/darkfield/bauxiterockhigh.html   (472 words)

  Bauxite - Wikipedia, the free encyclopedia
Bauxite is a naturally occurring, heterogeneous material composed primarily of one or more aluminium hydroxide minerals, plus various mixtures of silica, iron oxide, titania, aluminium silicates, and other impurities in minor or trace amounts.
Bauxite is a sedimentary rock produced by in situ chemical weathering typically under tropical to subtropical climate conditions.
The principal aluminium hydroxide minerals found in varying proportions with bauxites are gibbsite and the polymorphs boehmite and diaspore.
en.wikipedia.org /wiki/Bauxite   (312 words)

 BAUXITE - LoveToKnow Article on BAUXITE   (Site not responding. Last check: 2007-11-05)
Bauxite can therefore scarcely be regarded as a simple mineral, but rather as a mixture of gibbsite and diaspore with various impurities; it is in fact strikingly like laterite, both in chemical composition and in microscopical structure.
Bauxite is of value chiefly as a source of metallic aluminium (q.v.); the material is first purified by chemical processes, after which the aluminium hydroxide is reduced in the electric furnace.
Bauxite is also largely used in the manufacture of alum and other aluminium salts used in dyeing.
92.1911encyclopedia.org /B/BA/BAUXITE.htm   (513 words)

 Bauxite Mineral,Bauxite Information,Uses of Bauxite,Bauxite Suppliers
BAUXITE is a naturally occurring, heterogeneous material composed primarily of one or more aluminum hydroxide minerals, plus various mixtures of silica, iron oxide, titania, aluminosilicate, and other impurities in minor or trace amounts.
Bauxites are typically classified according to their intended commercial application: abrasive, cement, chemical, metallurgical, refractory, etc. The bulk of world bauxite production (approximately 85%) is used as feed for the manufacture of alumina via a wet chemical caustic leach method commonly known as the Bayer process.
Bauxite mining is accompanied by land rehabilitation and environmental control to restore the area to a desirable environmentally friendly condition.
www.mineralszone.com /minerals/bauxite.html   (1589 words)

Aluminum ore, called bauxite, is most commonly formed in deeply weathered rocks.
This sample of bauxite ore is from Western Australia.
Diagram from ITAM Bauxite by the Minerals Council of Australia.
volcano.und.nodak.edu /vwdocs/minerals/bauxite.html   (113 words)

 Bauxite Mining and the Environment
On a world-wide average 4 to 5 tonnes of bauxite are needed to produce two tonnes of alumina, from which one tonne of aluminium can be produced.
Bauxite is currently being extracted in Australia (in excess of 40 million tonnes per year), Central and South America (Jamaica, Brazil, Surinam, Venezuela, Guyana), Africa (Guinea), Asia (India, China), Russia, Kazakhstan and Europe (Greece).
For all forest areas used for bauxite mining, 80% is returned to native forests, the rest is replaced by agriculture, commercial forest, or recreational area, thereby making the area more productive for the local community.
www.azom.com /details.asp?ArticleID=1529   (643 words)

Ashapura’s diversification into bauxite in the late 90’s was a masterstroke as it has rapidly moved to the position of a global player and is moving from strength to strength with its calcined bauxite and alumina refinery project (in the implementation stage).Ashapura is among the largest private bauxite mining companies in India.
Bauxite is a naturally occurring sedimentary rock produced by insitu chemical weathering and composed primarily of one or more aluminium hydroxide minerals plus various mixtures of silica, iron oxide, titanium and other elements.
Gibbsitic bauxite is in great demand even in refineries that have access to the other varieties of bauxite because the cost of transporting gibbsitic bauxite is still lower than the increment fuel and power cost for digesting other bauxites.
www.ashapura.com /bauxite.html   (529 words)

 Bauxite Geology   (Site not responding. Last check: 2007-11-05)
Bauxite occurs in three main forms depending on a) the number of molecules of water of hydration and b) the crystalline structure.
Of the bauxite ores currently being mined the dominant form is Gibbsite, followed by a mixed ore of Gibbsite and Böhmite.
Bauxite is found in four types of deposit: blanket, pocket, interlayered and detrital.
www.world-aluminium.org /production/mining/geology.html   (460 words)

 Highbeam Encyclopedia - Search Results for bauxite
Bauxite is a mixture of several minerals, such as diaspore, gibbsite, boehmite and iron.
A noncrystalline substance formerly thought to be a mineral, bauxite is claylike and earthy and ranges in color from white to deep brown or red according to the nature and quantity of its...
Its economy is based on the processing and shipment of minerals (gold, bauxite, diamonds, and gold) found in the surrounding region.
www.encyclopedia.com /SearchResults.aspx?Q=bauxite   (758 words)

Bauxite is a sedimentary rock that is an aluminum ore. It is formed in weathered volcanic rocks.
The water in bauxite is taken out of the ore. This leaves a white powder that is called alumina which is another name for aluminum oxide.
Bauxite is thought of as a rock because the minerals in it can be very different depending on where it is found.
library.thinkquest.org /05aug/00461/bauxite.htm   (253 words)

 Bauxite, Arkansas - Wikipedia, the free encyclopedia
Bauxite is a town located in Saline County, Arkansas.
Bauxite is located at 34°33'33" North, 92°30'51" West (34.559107, -92.514038)
The town experienced a large "boom" in the early 1940s, due to its ability to produce the mineral bauxite, the source ore for aluminum.
en.wikipedia.org /wiki/Bauxite,_Arkansas   (419 words)

 Worsley: About Us: Bauxite
Bauxite is formed by the weathering of clay in warm regions that experience wet and dry weather cycles.
The clay content of the bauxite needs to be low if the resources is to be economically viable because it is expensive to separate from alumina in the refining process.
Gibbsitic bauxite is the most common form, found in tropical or subtropical regions, very close to the ground surface.
worsley.geo.net.au /pages/bauxite.php4   (227 words)

 Alcoa in Australia: Pinjarra Efficiency Upgrade Project: Questions & Answers: Bauxite Mining
Bauxite for the Pinjarra refinery is sourced from the Huntly mine in the Darling Range.
Potential bauxite deposits are identified initially by a process of geological mapping, which is followed by a program of drilling, sampling and chemical analysis.
The results are plotted and the extent of each bauxite deposit is then determined by a number of considerations including the chemical characteristics of the ore and the feasibility of access to the area by mining equipment.
www.alcoa.com /australia/en/info_page/PUREFAQ_BauxiteMining.asp   (706 words)

Bauxite, Jamaica's main mineral resource, is a vital element of the country's economy.
Bauxite mining began in 1952, with an initial output of half a million tons per year and increasing to a maximum output of 15 million tons by 1974.
Even though bauxite mining is responsible for the removal of sugar cane, coffee, cocoa and citrus and banana trees from the environment, their growth however is not adversely threatened.
www.american.edu /projects/mandala/TED/bauxite.htm   (2546 words)

The discovery of bauxite deposits in Western Australia’s Darling Range led to the establishment of a mining industry around Jarrahdale in 1963.
When mining for bauxite about half a metre of topsoil and overburden is removed and conserved for later rehabilitation, then the next one to two metres of bauxite is drilled and blasted for extraction.
Bauxite extracted from the Darling Range is a low-grade ore with a content of more than 27 percent aluminium oxide.
www.liswa.wa.gov.au /wepon/mining/html/bauxite.html   (227 words)

 Bauxite - Search Results - MSN Encarta
Bauxite, important ore of aluminum, consisting of aluminum oxide of various degrees of hydration, usually mixed with impurities, particularly iron...
arsenic, asbestos, asphalt, bauxite, carbon, clay, coal, coke, feldspar, fluorite, graphite, gypsum, jet, lime, mica, pyrite, quartz, rock, silicate,...
Bauxite : pictures of bauxite mines and plants
ca.encarta.msn.com /Bauxite.html   (112 words)

 Earlham College Geo 211 Bauxite
Bauxite exists in three forms: loose pisolitic, with small and rounded marble-size grains, cemented pisolitic, with small grains are cemented together, and tubular, larger chunks with erratic cavities.
Bauxite is found predominantly in tropical and subtropical areas near the equator, but there are some regions in Europe that contain bauxite, and there was once a great deal of bauxite in Arkansas.
Bauxite is found in four different types of deposits, blanket, pocket, interlayered, and detrital.
www.earlham.edu /~lambca/Geo/lamb.htm   (2409 words)

 CRB Fundamentals
Bauxite is a naturally occurring, heterogeneous material comprised of one or more aluminum hydroxide minerals plus various mixtures of silica, iron oxide, titanium, alumina-silicates, and other impurities in trace amounts.
Bauxite is an important ore of aluminum and forms by the rapid weathering of granite rocks in warm, humid climates.
Bauxite is dull in appearance and may vary in color from white to brown.
www.crbtrader.com /fund/articles/bauxite.asp   (503 words)

 [No title]   (Site not responding. Last check: 2007-11-05)
Bauxite occurs close to the surface in seams varying from one metre to nine metres, formed as small reddish pebbles (pisolites).
Bauxite is added at the high temperature point, red mud is separated at an intermediate temperature, and alumina is precipitated at the low temperature point in the cycle.
Bauxite usually consist of two forms of alumina - a monhydrate form Boehmite (Al O) and a trihydrate form Gibbsite (Al QAL uses the Bayer Process to refine two grades of Weipa bauxite, the bulk of which is "monohydrate" grade bauxite.
www.qal.com.au /a_process/a_process.html   (359 words)

Bauxite deposits in Ghana occur mainly at Setwi Bekwai in the Western Region, Aya-Nyinahin in the Ashanti Region, Kibi and at Mount Ejuanema, both in the Eastern Region.
The effect of solid to liquid ratio (ratio of solid bauxite in grammes to liquid acid in mls) on leaching was investigated by keeping the weight of bauxite constant and increasing the volume of the liquid phase.
Commercial leaching is reported to be in the range 100-120 °C. The degree of size reduction in the bauxite is a critical parameter, which influenced the optimum extraction of alumina.
home.att.net /~africantech/GhIE/Awaso1.htm   (1202 words)

Bauxite (the chief ore of aluminium) is so called because it was first discovered at Les Baux, in France.
Principal ore of aluminium, consisting of a mixture of hydrated aluminium oxides and hydroxides, generally contaminated with compounds of iron, which give it a red colour.
Chief producers of bauxite are Australia, Guinea, Jamaica, Russia, Kazakhstan, Suriname, and Brazil.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0015221.html   (182 words)

 2000 Field Trip, Lafayette Geological Society - A professional organization for earth scientists
Located on the property of this former bauxite mine is an outcrop of the huge batholith underlying Saline and Pulaski Counties.
A sketch of the batholith outcrop and the embedded xenolith is reproduced from Howard's brochure.
The principal ore mineral in Arkansas bauxite is gibbsite, the trihydrate of alumina, rather than the dihydrate of aluminum in the original type specimen.
www.lgsweb.org /field00a.html   (970 words)

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