Now gold mining in the developed countries tends to increase in volumes. Need for new developments on ways of receiving gold appears from behind high growth rates and good competitiveness of jewelry from gold.
It is required to you
- Devices for carrying out chemical processes, mercury solution, oxygen, metal zinc, sulfuric acid, cyanide solution,
Instruction
1. Gold can be received by means of process of an amalgirovaniye. For this purpose gold is dissolved in mercury, forming at the same time amalgam which at the contents as a part of more than 15% of Au, becomes firm. Further, from the received amalgam mercury is driven away in the special condensing devices, leaving Au and Ag.
2. If to receive gold by means of leaching, then for this purpose it is necessary to connect Au to solution of cyanide of sodium or a kaoiya, it is obligatory with oxygen presence. To Vrezultatya of this process complex anions are formed.
3. Further, from the received solution, gold is emitted by means of influence metalof zinc, in the colloidal rest. That to purify gold from residues of zinc, it is processed the diluted sulfuric acid, then washed out and well dried.
4. Further processing of gold happens to the help of impact of electrolysis or the hot concentrated sulfuric acid.
5. Also, gold is well dissolved in chloric water, and in the solutions of cyanides of alkaline metals blown by air.
6. Compounds of gold, it is possible to subject easily to process of decomposition by means of heating as a result of which metal Au is allocated. Because of the softness, gold is used in alloys, most often with silver and copper. Such alloys can be used also for electric contacts.