Electrorefining of metals pdf

This preview shows page 1 - 3 out of 5 pages. Electrorefining High purity metals are needed in a number of applications Chemical methods > usually low purity Electrochemical dissolution/ redeposition of impure product results in much higher purity Applications: Electrowinning This report discusses Electrorefining Copper research conducted to increase the rate, deposit purity, and overall efficiency in industrial processes used to electrodeposit and purify metals by increasing substantially the operating current density range and optimizing the deposition process. Examples include a group of gold and platinum-group-metal operations in South Africa that extract ore from deep underground mines that employ refrigerated ventilation, multi-stage pumping, specialized compressors, and other types of equipment to meet requirements that are not commonplace in the - Metal below reduces metal above Yamawaki et al. Pure Appl Chem vol 72, No 10, pp. 1839-1849 - Metals below hydrogen line cannot be Industrial electrometallurgy examples. Aqueous Electrolytes - Electrowinning of copper - Electrorefining of copper - Electrowinning of zinc. metal ions and salt • Avoids problems associated with aqueous chemistry ? Hydrolysis and chemical instability • Thermodynamic data at hand or easy for U/TRU/RE Salt from 10 electrorefining systems 9-22 ATW Fuel Fabrication Step 12 Input Vacuum Casting Furnace • From #10 and #11 ? 1.7 kg U Our topic for today is Electrolytic Refining of Metals. Electrolytic refining is the process of obtaining pure metals like gold, silver, copper etc. by the File: PDF, 7.32 MB. 7. ELECTROREFINING 7.1 Theoretical Aspects of Electrorefining 7.1.1 Selectivity of metal dissolution and deposition 7.2 Theoretical Aspect of Copper Electrorefining is the purification of metals by electrolysis. The impure metals is dissolved anodically and pure metal is Other articles where Electrorefining is discussed: metallurgy: Extractive metallurgy: from one electrode of an electrolytic cell and its deposition in a purer form onto the other electrode. Chemical refining involves either the condensation of metal from a vapour or the selective precipitation of metal The clean or pure metal is formed at the cathode when the electrical current of a sufficient voltage is applied by dissolving impure metal at the anode. Electrolytic refining is also sometimes referred to as Electrorefining. Electrorefining of silver The silver alloy anodes are electrorefined in conventional Thum cells using a nitrate electrolyte containing silver nitrate, sodium nitrate and nitric acid. Nitric acid and sodium nitrate are added for conductivity, although the nitric acid also prevents silver precipitation. Electrodeposition of warious metals. 356. CHAPTER II. Kaynakca bilgileri. Basl?k. Electroplating and Electrorefining of Metals. Electrorefining of Copper 1. Electrorefining - General Introduction In an electrorefining process, the anode is the impure metal and the impurities must be lost during the passage of the metal from the anode to the cathode during electrolysis, i.e. the electrode reactions are, at the anode Electrorefining of Copper 1. Electrorefining - General Introduction In an electrorefining process, the anode is the impure metal and the impurities must be lost during the passage of the metal from the anode to the cathode during electrolysis, i.e. the electrode reactions are, at the anode Electrorefining is the least expensive way to purify met