Why is anode slime valuable?
Why is anode slime valuable?
As a conclusion, it is widely acknowledged that the anode slime is complex in content but of high value, and the tendency to utilize the anode slime is to shorten recovery process and production period, reduce circulating loss and increase recovery rate.
What is anode slime used for?
During the electrorefining of copper, some metals are accumulated in the byproduct anode slime, which is an important source for recycling and recovery of these metals (Petkova, 1994).
What metals are in the anode slime impurities?
The main contaminant in the anode is copper, with minor amounts of lead, cadmium, and zinc. Metals such as gold and platinum, which are insoluble in nitric acid, do not dissolve and report to the anode mud.
Why does the anode decrease after Electrorefining?
Answer: oxidation occurs at the anode. copper is oxidised During electrorefining , stage of copper production a series of A copper anode and things Tata sheet cathodes are suspended in a tank the electrolyte containing the copper and flow through tank.
What is slime in metallurgy?
In metallurgy, ore reduced to a very fine powder and held in suspension in water so as to form a kind of thin ore mud; generally used in the plural. vii. Primary slimes are extremely fine particles derived from ore, associated rock, clay, or altered rock.
What is the difference between electrowinning and electrorefining?
Electrowinning is defined as the process in which the metals from their ores are put in the solution that is they are electrodeposited to liquefy the metals. Whereas in electrorefining, it is defined as the process in which the impurities from the metal are removed.
How is electrorefining done?
Electrolytic Refining Electrorefining entails electrochemically dissolving copper from impure copper anodes into an electrolyte containing CuSO4 and H2SO4 and then electrochemically depositing pure copper from the electrolyte onto stainless steel or copper cathodes. The process is continuous.
What is slime in mining?
Most underground mines use water for drilling, cutting, washing and dust control. This water, in addition to the normal seepage of groundwater, flows to underground holding sumps. If the sumps are not cleaned of these solids, the material can become a dry, hard mud referred to as “mine slimes.”
Is electrolysis and electrowinning the same?
is that electrowinning is the electrodeposition of metals from their ores that have been put in solution or liquefied while electrolysis is (chemistry) the chemical change produced by passing an electric current through a conducting solution or a molten salt.
What is electro whining?
Electrowinning (or electroextraction) is a process of whereby metals, such as gold, silver and copper,are recovered from a solution by means of electrolytic chemical reaction. This takes place when an electric current is passed through the solution.
Why does the anode decrease after electrorefining?
Where is electrowinning used?
Electrowinning is most commonly used to recover gold, silver, copper, cadmium, and zinc. Gold and silver are the most successfully recovered metals because of their high electropotential. Chromium is the only metal commonly used in electroplating that is not recoverable by electrowinning.
What is anode slime recovery?
Copper Anode Slime Recovery. Anode slime is a byproduct from copper or lead electro-refining process. The copper/lead anode slime usually contain As, Sb, Bi and precious metals like gold and silver.
What is the hydrometallurgy of copper anode slime?
As for hydrometallurgy of copper anode slime, the process is relatively flexible and smelters adjusts the process as per the characteristics of the raw material. Whereas the lead anode slime is firstly treated with chloride leaching and then the leaching residue can be mixed with de-selenium and de-coppered copper anode slime for further recovery.
How to process anodic slimes from an Egyptian electrorefining plant?
Processing of anodic slimes from an Egyptian copper electrorefining plant, exhibiting high contents of copper, lead, tin and silver has been presented. The proposed hydrometallurgical process consists of two leaching stages for extraction of c opper with H2SO4 – O2 and silver with thiourea – Fe 3+ .
What is electrorefining anode slime made of?
Processing of copper electrorefining anode slime: a review. Anode slime is the insoluble product deposited at the bottom of the electrorefining tank during electrorefining of copper. It generally contains Cu, Ni, Se, Te, Ag, Au, platinum group metals (PGM), Pb, Ba, Fe, etc.