![]() ![]() As cementitious additives, gibbsite reacts with portlandite, having beneficial effects on cement hydration and paste rheology. It has many valuable effects on ceramic and cement applications due to the unique properties provided by alumina. Gibbsite is mostly found in the clayed fraction of bauxite, as a secondary phase. The industrial use of bauxite and derivatives materials is mostly based on the high aluminum hydroxide content, as gibbsite or boehmite. ![]() Recently, bauxite has been used as an additive in various material compositions, to improve functional properties or for alternative sustainable products. Apart from the metallurgical usage, bauxite has found diverse applications in manufacturing various products like cement, abrasives, refractories, chemicals, etc. ![]() The correlation between the pozzolanicity, the amorphous phase content, and the specific surface area indicated that the raw and the calcined materials present an interesting reactivity for using them in alternative cement formulations.īauxite is a source of diverse aluminum ores, with a high content of hydrated aluminum oxides such as gibbsite, boehmite, and diaspore. Also, the heating at only 600 ☌ gives a significant pozzolanic activity in combination with Portland cement. ![]() During heating, the raw bauxite undergoes high densification with low linear shrinkage, motivating a potential use in dense ceramic compositions with high thermal stability. It meets the chemical composition required for bauxites used for refractory cement. It was evidenced that the raw sample is gibbsite-rich type bauxite with about 45.06 wt% of alumina, 23.80 wt% of iron oxide, and 1.74 wt% of silica. Send us feedback.Assessing the potential uses as industrial mineral, bauxite from Débélé, Guinea, has been characterised by chemical and mineralogical analyses, the determination of the amorphous content, the rate of portlandite consumption in an aqueous solution, the strength activity index, and the thermal behaviour up to 1200 ☌. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'bauxite.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2019 Last week protesters attempted to tear up Rusal’s bauxite-transporting railway line. 2019 Montenegro sits on significant deposits of minerals such as bauxite and possibly rare-earth elements.Ĭhristopher R. 2019 And in Guinea, which supplies Rusal, a Russian aluminium firm, with 27% of its bauxite, Russia is supporting efforts by President Alpha Condé to defy the constitution and run for a third term. 2019 Elsewhere, bauxite mining has had devastating consequences. 2020 Income from tourism and bauxite, the main earners of foreign exchange, had plunged in the aftermath of the global financial crisis. 2020 The Ghanain government is also considering plans to sell some of that land to Chinese developers to mine for bauxite, a mineral important for creating aluminum. 2020 Some in Guyana worry that the government’s preoccupation with oil is already displacing resources from the country’s traditional industries - sugar, rice, bauxite and gold - which are the country’s largest sources of employment.Īnatoly Kurmanaev, New York Times, 5 Mar. Recent Examples on the Web The country is braced for a rapid transitioning from a relatively poor exporter of sugar, gold and bauxite, into one of South America’s richest countries. ![]()
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