Blood tests are very common. When you have routine checkups, your doctor may recommend blood tests to see how your body is working. Many blood tests don't require any special preparations. For some, you may need to fast (not eat any food) for 8 to 12 hours before the test. Your doctor will let you know how to prepare for blood tests. During a blood test, a small sample of blood is taken from your body. It's usually drawn from a vein in your arm using a needle. A finger prick also might be used.
Extraction of aluminium. Aluminium is the most abundant metal on Earth. Despite this, it is expensive, largely because of the amount of electricity used up in the extraction process. Aluminium ore is called bauxite.The bauxite is purified to yield a white powder, aluminium oxide, from which aluminium can be extracted.The extraction is done by electrolysis. But first the aluminium oxide must be made molten so that electricity can pass through it.nstead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium. Diagram showing cell for aluminium extraction. The diagram shows an aluminium oxide electrolysis tank.
For nearly all metals a chemical reaction is used to extract the metal from its ore. Since chemical reactions are accompanied by either the release or absorption of heat, a form of energy, it can be concluded that for most metals the extraction reactions require the input of considerable amounts of energy (heat).he more common a metal is and the easier it is to extract and produce the. lower the commercial price. Aluminium is the most abundant metal, but is very. reactive and therefore requires large amounts of electricity to extract it from its. ore, Bauxite. Iron on the other hand is cheaper to extract from its ore.