How to extract noble metals from waste electronic products
Combustion melting process, high temperature oxidation smelting process, scum technology, electric arc furnace sintering process, etc..
The extraction from the waste electronic products in the precious metal technology is an important precious metal recycling technology, basic principle is the use of metallurgical furnace heating stripping non metal material, metal material or other metal smelting melting in molten salt, then separation. Non-metallic materials, mainly printed circuit board materials, etc., are generally dross removal, and precious metals and other metal substances in alloy form after the outflow of refined or electrolytic treatment. The main process methods are combustion melting process, high temperature oxidation smelting process, scum technology, arc furnace sintering process and so on.
Advantages and disadvantages of noble metal extraction by flame metallurgy process:Although the technology of extracting noble metals by means of metallurgy has many advantages, such as simplicity, convenience and high recovery rate, there are many disadvantages:1. Burning adhesives and other organic substances on printed circuit boards will produce a large amount of harmful gas and cause two pollution;2, a large number of scum emissions increased by two times solid waste, and at the same time, residue in the residue of some useful metal industry was discarded together; 3, this method can only recover some precious metals, other non-ferrous metals recovery rate is low;4, energy consumption, processing equipment expensive, economic benefits are not high.