gold
Gold is one of the most sought-after minerals and love of possession because of its glamor, which catches the attention of the most beautiful pieces of adornment adorned by women. Due to their high material value and price stability, gold bars and gold pieces are among the most important investments by big businessmen. The methods and of extracting gold from the earth vary according to the type of gold and its concentration and methods of formation. The method of extracting gold from the earth depends on several bases:
- Percentage of the amount of gold present in the earth.
- Metal molten with gold and its quantity.
- The size of the gold particles you see in the naked eye or microscopic.
Methods of extracting gold
There are many ways to extract gold either manually or to the most important of these methods:
- Cyanide method.
- Lead method: This method extracts 100% of the gold to be extracted, especially with gold with microscopic particles, but this method is very expensive and dangerous because of lead gas emitted from them, and it is difficult to recover gold after the completion of this method.
- The method of royal water: used by experts in chemistry and need to be very accurate in the process of melting gold and sediment and purification of the surrounding minerals, and is dangerous because of the gas emitted from them.
- Method of mercury: This method is used with visual samples of the naked eye and does not exceed the proportion of gold extracted from us 40% so do not use as many as the previous methods.
- Centrifuge method: Used with visual samples that do not contain silica particles.
How to extract gold
How to extract gold and purify of molten metals with it:
- Grinding: The special mills are formed with the aim of grinding gold and metals.
- Concentration: Since gold is one of the highest densities, its density is 19, which helps to separate it from the rest of the material by inserting the molten resulting from the milling process in the focusing machine, which is to roll the particles in a large cylindrical container so that the molten gold particles fall down because of the high density of the other metal particles and thus accumulate gold particles in the bottom of the container, which facilitates the separation and collection.
Due to the importance of gold and its high value and price since ancient times, many people tried to convert other metals to gold and could not. With the development of technology and science, it is possible to convert other metals to gold by coating them with an outer shell of gold. The 14-gauge or 24-caliber gold is the most sought-after market by consumers.