Search results
Results From The WOW.Com Content Network
Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within the ore, into soluble salts while the impurity remains insoluble. These can then be washed out and processed to give the pure metal; the materials left over are commonly known as tailings .
Autoclave leaching. Autoclave reactors are used for reactions at higher temperatures, which can enhance the rate of the reaction. Similarly, autoclaves enable the use ...
An autoclave is a machine used to carry out industrial and scientific processes requiring elevated temperature and pressure in relation to ambient pressure and/or temperature. Autoclaves are used before surgical procedures to perform sterilization and in the chemical industry to cure coatings and vulcanize rubber and for hydrothermal synthesis ...
Cyanide leaching "heap" at a gold mining operation near Elko, Nevada. On top of the large mounds of ore, are sprinklers dispensing a solution of cyanide. Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons is produced from ...
It is performed in an autoclave at high pressure and temperature, where high-purity oxygen mixes with a slurry of ore. [2] When the original sulfide minerals are oxidized at high temperature and pressure, it completely releases the trapped gold. Pressure oxidation has a very high gold recovery rate, normally at least 10% higher than roasting. [1]
By boiling away the ammonia; copper is precipitated as a sulfide and sent to a smelter. Hydrogen sulfide is added to the autoclave to remove nickel sulfide and copper sulfide which is fed back to the leaching process. Air is then passed through the solution in the autoclave for oxyhydrolysis.
In 1892, Bayer discovered that by using an autoclave, or a pressure leaching vessel, in combination with a sodium hydroxide leachant the process resulted in a very pure sodium aluminate solution that could be used for his precipitation step [8] that he discovered previously. Both steps are widely used today but have been improved upon as ...
The hydrometallurgical process of flotation and autoclave leach the ore; Tailings, the leftover sand-like particles of rock that have been stripped of their economic metals in flotation, will be collected and pumped in slurry form to the tailings basin. Some reclamation is planned and financial assurance plans are being made. [4]