Bauxite - an overview | ScienceDirect Topics
Bauxite is defined as a mineral ore composed primarily of aluminum oxides and/or hydroxides, along with smaller amounts of iron oxyhydroxides and clay minerals. It is specifically classified based on its aluminum content and weight ratios, meeting industrial standards for …
Bauxite - an overview | ScienceDirect Topics
Bauxite occurs mainly in tropical and subtropical areas. In 2000, Australia was the leading worldwide bauxite producer with a production share of 39%, followed by Guinea (13%), Brazil (10%), and Jamaica (8%) (Table II). Bauxite reserves are estimated to be 23,000 million tons.
A comparative review of the mineralogical and chemical …
2023年8月1日 · Bauxite is the main source of the world's aluminium, supplying 99% of metallic aluminium. Thus Bauxites are economic concentrations of aluminum, developed from the weathering of aluminosilicate-rich parent rocks [4]. Aluminium in bauxites is known to be precipitated in the form of gibbsite [Al(OH) 3] or amorphous Al-hydroxides.
Provenance and genesis of karstic bauxite deposits in China ...
2024年10月1日 · The bauxite-bearing rock series of the karstic bauxite deposits is primarily composed of bauxite and claystone interlayers, and the bauxite primarily is light gray in color (Fig. S1K and L) and exhibits oolitic, clastic, and nodular textures (Fig. S2G and H; Zhang et al., 2022).
Research progress on the enrichment of gallium in bauxite
2023年9月1日 · Bauxite is the product of surface weathering under humid tropical–subtropical conditions, and is one kind of aluminum hydroxides and oxides containing Si, Fe, and Ti (Bárdossy, 1982, Bárdossy and Aleva, 1990). The aluminum hydroxides in bauxite mainly consists of gibbsite [Al(OH) 3], boehmite [γ
Geologic characteristics and potential of bauxite in China
2020年5月1日 · Small sized bauxite deposits are also associated with upper Permian Formations such as Wujianping and Xuanwei, both of which overlie Carboniferous-Permian limestones. Paleocene–Neogene lateritic bauxite deposits in China are derived either from Quaternary basalts or upper Paleozoic carbonates in Hainan and Guangxi. (Gao et al., 2015)
Role of bauxite residue as a binding material and its effect on ...
2023年12月15日 · The safe disposal of bauxite residue (BR) poses significant economic challenges due to the large land area required, which increases the overall cost of alumina production. As a rough estimate, a 1-million-ton-per-year alumina factory needs 1,000,000 m 2 land every 5 years to accommodate the waste generated during the production process [46] .
Socio-environmental impact of mining activities in Guinea: The …
2023年2月10日 · Bauxite subsoil assets may be found in several parts of the planet. Guinea holds the largest bauxite reserves in the world, with an outstanding quantity of 7.4 billion dry tons. They are larger than those in Australia (5,1 billion dry tons), which is to date the first largest producer of bauxite in the world (U.S. Geological Survey, 2021).
Mineralogical and geochemical investigations on the Early …
2023年2月1日 · The clayey bauxite displays a massive structure with a small amount of oolitic particles (Figs. 4 a-b and 5 f). The fresh surface is cyan-gray (Fig. 4 a-b), and the thickness is between 1 and 2 m. The oolitic bauxite exhibits a dominant oolitic structure, accompanied by clastic and cryptocrystalline structures (Figs. 4 c-d and 5 a-c).
Climatic and hydrologic controls on upper Paleozoic bauxite …
2019年2月1日 · The bauxite deposits overlie a paleo-karstic surface developed on limestones of the Middle Ordovician Majiagou Formation, and they are covered by coal-bearing siliciclastic sediments or marlstone. The bauxite ore bodies fill shallow solution holes and deep dolines, and their shapes are thus controlled by the paleokarst topography.