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Bauxite

Bauxite formation

Lateritic bauxites (silicate bauxites) are distinguished from karst bauxite ores (carbonate bauxites). The early discovered carbonate bauxites occur predominantly in Europe and Jamaica above carbonate rocks (limestone and dolomite), where they were formed by lateritic weathering and residual accumulation of intercalated clays or by clay dissolution residues of the limestone.

The lateritic bauxites are found mostly in the countries of the tropics. They were formed by lateritization of various silicate rocks such as granite, gneiss, basalt, syenite, and shale. In comparison with the iron-rich laterites, the formation of bauxites demands even more on intense weathering conditions in a location with very good drainage. This enables the dissolution of the kaolinite and the precipitation of the gibbsite. Zones with highest aluminium content are frequently located below a ferruginous surface layer. The aluminium hydroxide in the lateritic bauxite deposits is almost exclusively gibbsite.

In the case of Jamaica, recent analysis of the soils showed elevated levels of cadmium suggesting that the bauxite originates from recent Miocene ash deposits from episodes of significant volcanism in Central America.

Processing

Bauxite is usually strip mined because it is almost always found near the surface of the terrain, with little or no overburden. Approximately 70% to 80% of the world's dry bauxite production is processed first into alumina, and then into aluminium by electrolysis as of 2010. Bauxite rocks are typically classified according to their intended commercial application: metallurgical, abrasive, cement, chemical, and refractory.

Usually, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of 150 to 200 °C. At these temperatures, the aluminium is dissolved as an aluminate (the Bayer process). After separation of ferruginous residue (red mud) by filtering, pure gibbsite is precipitated when the liquid is cooled, and then seeded with fine-grained aluminium hydroxide. The gibbsite is usually converted into aluminium oxide, Al2O3, by heating. This mineral becomes molten at a temperature of about 1000 °C, when the mineral cryolite is added as a flux. Next, this molten substance can yield metallic aluminium by passing an electric current through it in the process of electrolysis, which is called the Hall–Héroult process after its American and French discoverers in 1886.

Prior to the Hall–Héroult process, elemental aluminium was made by heating ore along with elemental sodium or potassium in a vacuum. The method was complicated and consumed materials that were themselves expensive at that time. This made early elemental aluminium more expensive than gold.

Numbers for 2010's total proven bauxite reserves x1,000 tonne.

Country Mine production Reserves Reserve base
2010 2011 (est.)
 Guinea 17,400 18,000 7,400,000 8,600,000
 Australia 68,400 67,000 6,200,000 7,900,000
 Vietnam 80 80 2,100,000 5,400,000
 Jamaica 8,540 10,200 2,000,000 2,500,000
 Brazil 28,100 31,000 3,600,000 2,500,000
 Guyana 1,760 2,000 850,000 900,000
 India 18,000 20,000 900,000 1,400,000
 China 44,000 46,000 830,000 2,300,000
 Greece 2,100 2,100 600,000 650,000
 Iran 500
 Suriname 4,000 5,000 580,000 600,000
 Sierra Leone 1,090 1,700 180,000  ?
 Kazakhstan 5,310 5,400 160,000 450,000
 Venezuela 2,500 4,500 320,000 350,000
 Russia 5,480 5,800 200,000 250,000
 United States NA NA 20,000 40,000
Other countries 2,630 2,600 3,300,000 3,800,000
World total (rounded) 209,000 220,000 29,000,000 38,000,000

Source Wikipedia

Al2O3 80,0% min.
SiO2 14,00% max.
Fe2O3 2,50% max.
TiO2 4,20% max.
Packaging Big Bags
Size 0-1 / 0-3 / 1-3 / 2-8 / 3-8 mm
Spezification
Bauxit 80Bauxit 80

 

Al2O3 90,0% min.
SiO2 5,00% max.
Fe2O3 1,50% max.
TiO2 3,00% max.
Packaging Bulk, Big-Bags
Size 0-1 / 1-3 / 3-6 mm
Spezification
Bauxite 90Bauxite 90