What Is Aluminium And How It Is Mined By Underground Mining And Also Tell About Its Ores?
It can be drawn out into wires that are finer than the finest hairs, and hammered into sheets as thin as a sheet of newspaper. It may surprise you to learn that it is the most abundant of an the metals in the world. Nearly 8 per cent of the earth’s crust is Aluminum. But aluminum is never found free in nature. It is combined with various substances to form parts of many rocks and soils. Did you know that sapphires, rubies, garnets, and other beautiful gems are compounds of aluminum? The problem was how to separate cheaply aluminum from the other substances. On February 23rd, 1886, a twenty-two-year-old chemist named Charles Martin Hall found a way to make this metal cheaply and in large quantities. In melted cryolite, which is a compound of aluminium and sodium with fluorine, he dissolved a small amount of aluminium oxide. Then he placed the mixture in a carbon vessel and passed a direct electric current through it. After about two hours, little “buttons” of metallic aluminium were fou
