Precious metals. Precious metal refining is the separation of precious metals from noble-metalliferous materials. Examples of these materials include used catalysts, electronic assemblies, ores or metal alloys. Process. In order to isolate noble-metalliferous materials, pyrolysis and/or hydrolysis procedures are
Dec 19, 2013· Refining of Metals: The most widely used method for refining impure metals is electrolytic refining. Electrolytic Refining:Take a solution of the metal
Refining of Metals the removal of impurities from crude metals. After extraction from raw materials, crude metals are between 96 and 99 percent principal metal, the rest being impurities. Crude metals cannot be used by industry at this stage because of inferior physical, chemical, and mechanical properties. The impurities found in crude metals may have
This a very convenient method for refining many impure metals. Most of the metals such as copper, silver, gold, zinc and chromium are refined electrolytically. The impure metal is made the anode and a thin sheet of the pure metal as cathode. A solution of a salt of the metal serves as the electrolyte.
Zone refining: Metals such as germanium, silicon, gallium, indium and boron are made free from impurities using this method.In this process the impure metal is attached to a circular mobile heater at one end. As the heater is moved, the pure metal crystallizes out and the impurities pass on to the adjacent part of the metal.
Sep 08, 2012· Chemistry Metal & Non Metals part 16 (Refining of metals) CBSE class 10 X.
