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Atomic number gold
Atomic number: 79
Atomic mass: 196.967
Melting point: 1064.43 ° c
Boiling point: 2807 ° c
Density: at 19.32 g/cm3
Electronic distribution: Xe] 4F14.5d10.6S1]
Gold history and existence in nature
Gold is the first metal was recognized by humans, in the middle of the stone age (about 8000 BC)
Dating the origin of gold label English geolo yellow means while the origin of the symbol from the Latin aurum meaning gold.
The ancient Egyptians had a long history in search of gold, extracted and acquire no gold deposit discovered only recently and had the ancients have primacy, and earliest geologic map of the mine on Papyrus for the potteries in the gold mine in the eastern desert of Egypt and saved the Louvre in France. Geologists estimate that the average concentration of gold in the crustal rocks is five per billion, this percentage varies from rock to another. And there are two basic types of raczat gold veins are tributaries.
There is gold in the individual case (free) any original condition and form veins there is also mixed with other metals including silver and various ratios, nature gold seems inherent in other elements such as copper, iron, mercury, antimony, tellurium, rhodium, palladium and other walbzmoth, and are often not attend alberit, iron sulphate, therefore often mailga to these metals are developed for the precious metal, gold is widespread in nature is widespread on the surface of the Earth’s crust below the depth of 3 km , There are very few ratios up to 100 part part of the million, a very small percentage do any meaningful recovery, sea water also contains gold in different proportions according to location, generally gold found in igneous rocks, as there is with quartz to form small granules and also with sand or riverbeds, gold can be obtained as a by-product when you draw some other metals such as copper, nickel and silver electrical methods.
Nature’s gold stocks is estimated at about 70,000 tons, which is 40 times more than the annual production of gold in the world.
There are three general ways to extract gold and chlorination (old method are not used at the moment) and mined walsindh.
Mined based on dissolution of gold in mercury, and boils down to crush ore and passed plates of copper submerged in mercury, slimming 55% so that when touching balls of mercury with gold it moistening then infiltrates the gold balls component mg gold.
Feature this way undemanding and low operating costs but use an extracting large amounts of gold in raw processor.
Alsenada is a production of 90% of the gold, and relies on dissolving gold ore in dilute solution (0.03%) of sodium cyanide or potassium in a sufficient quantity of oxygen, they reacts with gold composite component solution gold alsodiomi or albotasiomi, which dissolves well in water.
Gold can be obtained from complex solution dissolved through downsampling with zinc powder or aluminium, liberalized gold according to the following equation: