The previous gold beneficiation methods are as follows:
Its chemical properties are very stable. Under normal circumstances, it does not react with acids and bases, but it reacts with mixed acids and some special reagents to form soluble complexes. There are many methods for extracting gold from gold-bearing ore. The specific method to choose depends on the chemical composition of the ore, the mineral composition, the occurrence of gold and the requirements of the product.
Leaching is divided into two categories: physical methods and chemical methods. The physical methods are divided into amalgamation method, re-selection method, and flotation method. The amalgamation method is an effective method for recovering coarse-grained monomer gold. The method is to grind gold-containing ores with mercury, dissolve Au in mercury to form a gold amalgam, and then evaporate the mercury to obtain crude gold.
The gold yield of amalgamation method is between 50%-60%, and this method is more suitable for the treatment of high-grade gold ore. Gravity separation is a method of gravity separation using the density difference between gold and gangue. It is an ancient method for people to recover gold from gold mines. In the beneficiation or extraction process of vein gold ore, the gravity separation method is mainly used in the grinding loop to recover coarse-grained single gold, and this method is dominant in the gold extraction of placers.
Flotation is an important and effective method for enriching metal ore. This method is very suitable for recovering 0.84mm gold particles. This method is commonly used in smelting low-grade gold mines and gold mine tailings. This method is also applicable to sulfide ores containing gold, copper, lead, and zinc.
