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Bauxite • Bauxite is the ore from which most alumina is produced • Depending on the composition of the mother rock, the various bauxite deposits

A NEW METHOD OF RESOURCE ESTIMATION FOR BAUXITE AND OTHER

karst-bauxite deposits in Hungary In the following first the basic concepts of resource estimation, the advantages and the limitations of the traditional methods are discussed This is followed by a short presentation of the new mathematical methods, illustrated by test calculations, carried out on selected Hungarian bauxite deposits

WORLD BAUXITE MARKET

bauxite that yield one ton of aluminum, and T is the levy, equal to 08 for FY75-76 and 085 today (This formula is applied to long tons of bauxiteJ) Since the price of aluminum is now about 37¢ per pound, the per ton Jamaican levy is about $14 60 3An earlier study by this author [j5] computed for oil, bauxite, and copper,

Table 1: Mineral Chemical Groups and Formulae for Rock

Group Mineral Name Mineral Formula Native Elements Diamond, Graphite C (No anions) Gold Au Copper Cu Silver Ag Sulfur S Oxides Hematite Fe 2 O 3 anion = O Magnetite Fe 3 O 4 2-Corundum Al 2 O 3 Limonite FeO•OH Bauxite AlO•(OH) Silicates Quartz SiO 2 anion = Si x O y Opal SiO 2 •H 2 O Orthoclase, Microcline, Sanadine KAlSi 3 O 8 Ca

CHAPTER 7 METALLURGY EXERCISE 7 C Q1 State the position of

Name Chemical name Formula Red haematite Anhydrous ferric oxide Fe 2 O 3 Brown haematite Hydrated ferric oxide 2Fe 2 O 3 3H 2 O (b) Bauxite ore contains approximately 60 aluminium oxide The rest being sand, ferric oxide and titanium oxide (c) Red mud consists of ferric oxide, sand, etc left after bauxite dissolves in NaOH forming sodium

April 8, 2009 - INDIA

I Alumina- Bauxite is the most important aluminous ore for the production of alumina Bauxite occurs close to the surface in seams varying from one meter to nine meters, formed as small reddish pebbles (pisolites) Bauxite contains 40 to 60 mass alumina combined with smaller amounts of silica, titania and iron oxide

CHAPTER 7: Redox Reactions and Electrolysis

Extraction of aluminium from bauxite ore 1) Bauxite is impure aluminium oxide, Al 2O 3 The impurities are iron oxides, silicon dioxide and titanium dioxide Bauxite is the major aluminium ore 2) The ﬁrst step is to purify the bauxite to get pure aluminium oxide, Al 2O 3 3) Molten aluminium oxide is electrolysed in a solution of cryolite