After extraction with chelating agents, powdered irons were used to replace the chelated copper in the chelant extract, allowing for copper recovery. The recovery efficiencies of copper by the cementation process using powdered iron were 92–99%. After cementation, the extract containing EDTA or DTPA was reused to chelate supplementary fr...
Aug 17, 1999· The present invention is directed to the substantially selective extraction of tellurium from telluriumcontaining materials, and more particularly copper electrorefining slimes. Conventionally, a slurry of the shines is prepared in diluted sulphuric acid, and leached in an autoclave to extract certain metal values, including silver and tellurium.
Extracting of Copper from Other Ores. Copper can be extracted from nonsulfide ores by a different process involving three separate stages: Reaction of the ore (over quite a long time and on a huge scale) with a dilute acid such as dilute sulfuric acid to produce a very dilute copper(II) sulfate solution.
copper, silver and gold;copper replaces silver; lead replaces gold; platinum replaces gold, and so forth. However it should be noted that these reactions are not reversible and that the metals above hydrogen are soluble in acids while the metals below hydrogen are insoluble in acids. Therefore, cementation is a process in a which Table 1.
Ion exchange and cementation experiments were done to separate silver(I) from a raffinate containing silver(I), nickel(II), and zinc(II) and small amounts of copper(II) and tin(II). The raffinate resulted from the recovery of gold(III), tin(II) and copper(II) by solvent extraction from a leaching solution of anode slime. Ion exchange with anionic resins was not effective in separating silver(I ...
Extractions were also performed with four new taskspecific ionic liquids. When these liquids contain a disulfide functional group, they are efficient and selective for mercury and copper, whereas those containing a nitrile functional group are efficient and selective for silver and palladium.
THE HYDROMETALLURGICAL EXTRACTION OF ZINC BY AMMONIUM CARBONATE: A REVIEW OF THE SCHNABEL PROCESS T. G. HARVEY CSIRO Manufacturing and Infrastructure Technology, Victoria, Australia The use of ammonium carbonate for the extraction of metals such as copper and nickel is well known. Less well known is the fact that
Copper extraction techniques refers to the methods for obtaining copper from its ores.. The conversion of copper consists of a series of chemical, physical, and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local .
2 Recovery of Copper by Solution Mining Methods Solution mining replicates the natural process of oxidation and reduction, described above. Dilute acidic solutions are introduced to the copperbearing ores, causing dissolution of soluble copper minerals (Table 1) remaining in the leached cap and underlying enrichment blanket.
RECOVERY OF TIN AND COPPER BY RECYCLING OF PRINTED CIRCUIT BOARDS ... Leaching is the process of extracting a soluble constituent from a solid by means of a solvent (Habashi, 1999). In extractive ... for gold, silver, copper, iron, aluminum, tin, and .
Results countercurrent leaching process for copper extraction at 15% of solid concentration. ... In order to obtain a total recovery of metals from solution and to have an appreciation of the goldsilver cement purity, the cementation process was performed on a solution with a total volume of 1 L by using a zinc concentration of 10 g/L. The ...
metals like Gold, Silver, Copper, Selenium, mercury etc. Many of these products can be reused, refurbished, or recycled. Recovering precious metals from ewaste can also provide additional income with in the disposal process of end "of life electronics". In this paper few methods of extracting precious metals have been studied.
RECLAMATION AND CONTAINED DISPOSAL OF PREVIOUSLY PROCESSED MINE TAILINGS Task 1 Design Team B. Atkinson, H. Chuong, M. Gleason D. Hamlin, S. Mitchem, J. Watson Department of Chemical Engineering University of Arkansas Fayetteville, AR 72701 EXECUTIVE SUMMARY A process was designed to recover a pile of 50yearold mine tailings and transport