The level of electricity consumed by an aluminium smelter creates a very significant baseload demand. For example, a smelter with an annual output of 300,000 tonnes will require around 4,440 GWh of electricity.
It is estimated that the cost of electricity for the smelter is $14 per MWh (1.4 cents per kWh), and that it has cost the state more than $2 billion over 20 years. The Portland smelter is believed to consume between 8 and 10 per cent of the state's electricity.
Aluminium is the most plentiful metal in the earth's crust. It is found in the form of aluminium oxide in an ore called bauxite. Alumina and bauxite are the two main raw materials in the aluminium making process. Aluminium is obtained by the electrolysis of alumina which extracts pure aluminium metal from alumina.
It is expensive, largely because of the amount of electricity required in the extraction process. The ions in the aluminium oxide must be free to move so that electricity can pass through it. Aluminium oxide has a very high melting point (over 2000°C) so it would be expensive to melt it.
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Unlike most ores, Bauxite Ore cannot be smelted directly into ingots. Instead, it must be processed in a Macerator or Industrial Grinder to be ground into dust.
Aluminum is extracted from bauxite (sedimentary rock) during a two-step smelting process. First, the Bayer process separates alumina from bauxite. Also known as aluminum oxide, alumina then undergoes the Hall-Héroult process, producing pure aluminum. Each step decreases material quantity by half.
Bauxite ore is the world's primary source of aluminum. The ore must first be chemically processed to produce alumina (aluminum oxide). Alumina is then smelted using an electrolysis process to produce pure aluminum metal. Bauxite is typically found in topsoil located in various tropical and subtropical regions.
The electrolysis processThe diagram shows an electrolysis cell used to extract aluminium. Both electrodes are made of graphite, a form of carbon with a high melting point and which conducts electricity. During electrolysis: at the cathode , aluminium ions gain electrons and form aluminium atoms.
Aluminium is called the green metal because it is a very environmentally friendly metal. Recycling this material saves 95% of the energy required to produce aluminium from raw materials. This means it plays a key role in human ecology.
of aluminum. Some of the carbon used in aluminum smelting is a byproduct of oil refining; additional carbon is obtained from coal. Because aluminum smelting involves passing an electric current through a molten electrolyte, it requires large amounts of electrical energy.
Primary Aluminum Refining. Aluminum production from bauxite ore is a three step process. First the alumina is extracted from bauxite ore usually using the Bayer Process. In the Bayer Process, finely crushed bauxite is mixed with sodium hydroxide and placed in a `digester.
