Process Electrowinning For Gold Mining

Electrowinning is an electrochemical process used to reduce the metal cations to the cathode surface of an aqueous solution derived from the chemical leaching proces. Electrowinning or often referred to as electroextraction is the electrodeposition of metals from ore minerals that have dissolved into the liquid and will be processed using Electrorefining to remove impurities from the metal. Electrowinning an electrolytic process that is very old in the mining industry. 

The English chemist Humphry Davy first obtained sodium metal in the form of the element in 1807 by electrolysis of molten sodium hydroxide. And then in 1847 Maximilian, Duke of Leuchtenberg first to show an experiment about Electrorefining copper. Then James Elkington patented a commercial process in 1865 and successfully opened the first factory in Pembrey, Wales in 1870. The first commercial plant in the United States is Balbach and Sons Refining and smelting Company in Newark, New Jersey in 1883

     Electrowinning is applied to a variety of chemical solutions that are found in large mining industry. This process involves the use of alkaline cyanide solution as an electrolyte in a cell as the anode and cathode, among others, can use:

ANODE      ( - )	GOLD 99,99 %	STAINLESS STEEL 316	DICOATING MERKURY COPPER	IRON
CATHODE  ( + )	SILVER  99,99	STAINLESS STEEL 316	TIN	ALUMINUM

Cell reaction that occurs is: Merkury dicoating Copper, Lead, Iron, Aluminum
Anode: 2OH-→ O2 + H2O + 2e-
Cathode: 2Au (CN) 2 - + 2e-→ 2Au + 4CN-
Overall: 2Au (CN) 2 - + 2OH-→ 2Au + O2 + H2O + 4CN-

     

How to metal gold testing

        The testing process gold from gold bouillon is very necessary, in which the gold content so that the results we obtain can be seen the most of what percentage of karat or purity levels of the value contained in the gold metal.

How to do metal gold testing, In the process of testing the gold, there are several methods that can be used, ranging from gold assay methods in a simple way to use chemical solutions to using digital tools.

Several types of testing processes such as methods Touchstone testing, Acid testing kits, Electronic gold testers.