bauxite


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bauxite

(bôk`sīt, bŏk`–), mixture of hydrated aluminum oxides usually containing oxides of iron and silicon in varying quantities. 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 components. Bauxite occurs characteristically in pisolitic form, i.e., composed of small, round concretions. Its composition varies, alumina constituting from about 50% to about 70%. First discovered in Les Baux, France, bauxite is widely distributed, with important deposits occurring in Africa, South America, Russia, the West Indies, and the United States (Alabama, Arkansas, and Georgia). It is the chief source of aluminum and of its compounds, including alumina, alums, and alundum. It is used in the preparation of abrasives and as a refractory for spark plugs and furnace linings.

bauxite

[′bȯk‚sīt]
(petrology)
A whitish, grayish, brown, yellow, or reddish-brown rock composed of hydrous aluminum oxides and aluminum hydroxides and containing impurities such as free silica, silt, iron hydroxides, and clay minerals; the principal commercial source of aluminum.

bauxite

a white, red, yellow, or brown amorphous claylike substance comprising aluminium oxides and hydroxides, often with such impurities as iron oxides. It is the chief ore of aluminium. General formula: Al2O3.nH2O
References in periodicals archive ?
Gain an understanding of the global bauxite mining industry, reserves, historic and forecast data on bauxite production, aluminium prices, trade data for major exporting and importing countries, demand drivers, active, exploration and development bauxite projects and the competitive landscape.
Consumption of domestic bauxite will peak in China in 2019, while refineries in Henan and Shanxi provinces are forecast to be converted to utilize imported bauxite, the Melbourne-based company said.
4 percent of Al2O3 and Altogether Gibbsite is recovered with a purity of 90% [3] In China diaspore bauxite is recognized with high volume of Al2O3 and SiO2 and relatively low Al2O3 to SiO2 (usually the amount is m (Al2O3)/m (SiO2) = A/S (5-6)) and this ratio of Gibbsite bauxite and Boehmite bauxite is compared with other countries.
The upper layer is mainly composed of a small amount of bauxite blocks, carbonate fragments and soils.
Bauxite Resources Limited (ASX:BAU) was established in May 2006 to become a part of the bauxite and alumina industries in Western Australia where four of the seven Australian alumina refineries and four of Australia's bauxite mines are located.
A Mineral Resource estimate for the Cardea 3 Bauxite Deposit was completed during October 2011 by Bauxite Alumina Joint Venture personnel.
The right to develop Dian-Dian, the worlds largest bauxite minefield with confirmed reserves of 564 mln tonnes, belongs exclusively to RUSAL.
Bauxite Resources Ltd: Bauxite Resources' CEO Peter Canterbury speaks to Proactive Investors about resource growth and opportunities into China.
Vedanta Aluminium, India's largest producer of aluminium, gave no date for a restart of operations at its refinery in Lanjigarh, which has struggled to secure bauxite since opening in 2007.
It halted bauxite mining and suspended operations at its Kirkvine and Ewarton refineries a year ago due to a worldwide downturn in demand for aluminum.