How to extract gold


  • 1 stages of gold mining and mining
  • 2 Extract gold using starch
  • 3 History of gold mining
  • 4 References

The stages of gold mining and mining

Gold passes during its extraction and mining several stages, as follows: [1]
  • Access to gold: The location of gold deposited underground is determined within the rocks, and accessed by drilling or blasting, or drifting the surrounding rocks, where miners dig columns into the ground using small explosives, and then remove the gold ore from the rocks, collect, and transport To the treadmill.
  • Removal of residual precipitates: Gold-containing precipitates known as residues are removed using hydraulic mining, or shoveling, where the force of ground gravity is relied upon as the primary sorting force, using a machine called the hydraulic giant in the first method, where gold is exposed to a strong water stream for washing and shoveling In order for it to be deposited in special pits, as for the shoveling process, the same technique is used but with different shovels and buckets, where large quantities of sand and gravel carrying gold are extracted using huge machines such as shovels, and it is worth noting that many countries have banned p Mechanism of hydraulic mining being destroyed land and river pollution.
  • Grinding extracted gold: The gold is transferred to the mills after washing and filtering, where it is mixed with water and soil, and the resulting mixture is placed in a spherical mill containing for polishing.
  • Gold separation from the ore: This is done by following the buoyancy method that relies on separating the gold using certain chemicals in addition to the air, where the gold ore is placed in a solution that contains a foaming agent that bonds to the gold and forms an oil layer that sticks to the air bubbles, in addition to a mixture of organic chemicals that Other pollutants prevent it from sticking to it, after which the solution is ventilated, thus inflating air bubbles, which leads to the attachment of gold to them, and then the bubbles float and the gold is skimmed off the surface. As for the use of chemicals to separate the gold, the gold ore is placed in a tank containing Shop For cyanide dilute, and then zinc is added to the tank, a chemical reaction occurs to lead to the deposition of gold ore, and then separates the gold deposit in the piston filtration.
  • Gold smelting : gold is smelt if the cam is not pure enough, as the gold is heated using a special chemical, where it is bound with pollutants and floats on the melted gold, to be cooled after that and poured into molds.

Gold extraction using starch

Gold extraction by cyanide is considered dangerous, because it produces high-toxic by-products, and a new method of extracting gold has been discovered by researcher Zichang Liu, using corn starch instead of cyanide, where he mixed the gold bromide solution with a solution of sugary starch known as cyclodextrins The reaction output was gold needles and a mild alkaline salt that could be easily disposed of, unlike harmful cyanide residues. [2]  

The history of gold extraction

The process of extracting gold is defined as the preparation and preparation of raw materials that make up gold for use in various products, and gold mining and purification operations began during the sixteenth century, during the colonization of South and Central America before its transfer to Europe, and large gold deposits were discovered in Brazil, and on The eastern slopes of the Ural Mountains in Russia in the early eighteenth century, and in 1840 large silt deposits were found in Siberia. [3]