Gold resources occur and are mined in all Australian states and the Northern Territory.
Bauxite is usually strip mined because it is almost always found near the surface of the terrain, with little or no overburden. At these temperatures, the aluminium is dissolved as sodium aluminate the Bayer process.
The undissolved waste, bauxite tailingsafter the aluminium compounds are extracted contains iron oxidessilicacalciatitania and some un-reacted alumina. After separation of the residue 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 oxideAl2O3, by heating in rotary kilns or fluid flash calciners to a temperature in excess of oC.
Prior to the invention of this process, and prior to the Deville processaluminium ore was refined 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.
From this it can be extracted by a variety of methods. The most recent is the use of ion-exchange resin . Achievable extraction efficiencies critically depend on the original concentration in the feed bauxite. The remainder reports to the red mud and aluminium hydroxide streams.Aluminum is a silver-white metal and is very light in weight (less than three times as dense as water) yet strong.
Because aluminum is ductile, it can be drawn into wires or pressed into sheets or foil. Bauxite is a sedimentary rock with a relatively high aluminium content.
It is the world's main source of aluminium. Although aluminium demand is rapidly increasing, known reserves of its bauxite ore are sufficient to meet the worldwide demands for aluminium for many centuries.
Aluminum is manufactured in two phases: the Bayer process of refining the bauxite ore to obtain aluminum oxide, and the Hall-Heroult process of smelting the aluminum oxide to release pure aluminum.
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