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 ?
'We have never heard of anything regarding the bauxite mining project.
Bauxite ore is transported from GAC's jetty at the port of Kamsar by self-propelled barge to a transshipment point operated by EGA in deeper water.
ABx has declared large Mineral Resources at Inverell & Guyra in northern NSW, Taralga in southern NSW, Binjour in central QLD & in Tasmania, confirming that ABx has discovered significant bauxite deposits including some of outstandingly high quality.
'Despite the government's assertions, bauxite mining would forever destroy the Atiwa Forest, leaving extinct species and dried up water sources in its wake, said deputy national director of A Rocha Ghana, Daryl Bosu.
As a result, while Australia has doubled its exports of bauxite in the past decade, our exports of aluminium have fallen by 40 per cent.
Bauxite residue is a by-product of alumina refining - the process of turning bauxite ore into alumina, which is the feedstock for aluminium smelters.
Abdulla Kalban, EGA's managing director and CEO, said: "The arrival of this huge piece of equipment in Guinea is another big step forward in the GAC project, bringing us ever closer to producing and exporting our first bauxite ore."
The mine development project is estimated to create approximately 4,000 direct and indirect jobs in the Bok region, increase Guinea's GDP by more than 10 per cent annually and solidify Guinea's position as the world's largest exporter of bauxite, thus providing a significant uplift to the country's foreign earnings.
The agreement was first signed in 1992 to ship 4 million tons of bauxite per year to Iran, but the operation never started.
Bauxite is mined near the surface and refined into alumina, an intermediate product that's further refined into aluminum, the metal used in cans and window frames.
The sintered bauxite has a density between chromite and silica sand, indicating molds and cores using sintered bauxite would be lighter than chromite sand and heavier than silica sand.
All bauxite reserves are scattered sporadically around the earth in a way that 90% of these reserves are located in the 12 countries which were mentioned and the amount of their reserves, can be estimated as 22 billion tones that this amount could be adequate for the future of the considered countries until 2003 [2] Aluminum production in America is mostly provided by the metallurgical bauxite reserves that are essentially used for the industries of country and no change has been made in terms of production compared to 2001.