Abstract
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) because tin(II) and zinc(II) were selectively adsorbed into the anionic resins. It was possible to separate silver(I) by cementation with copper sheet. Treatment of the cemented silver with nitric acid solution increased the purity of silver(I) in the solution from 50.9% to 99.99%. Adjusting the pH of the AgNO3 solution to higher than 6, followed by adding ascorbic acid as a reducing agent, led to the synthesis of silver particles with micron size.
Highlights
In recent years, resources recycling has become an important issue in the chemical and metallurgical industries
Thesethat results indicate thatstep the mass recovery percentagepercentage of silver(I) remained constant. These results indicate the mass transfer transfer step plays a vital role during the cementation of silver(I)
Ion exchange and cementation experiments were done in this work to separate silver(I) from this raffinate
Summary
Resources recycling has become an important issue in the chemical and metallurgical industries. In order to recover pure metals or compounds with high purity from secondary resources, the valuable components together with some impurities are dissolved in the adequate leaching medium. Separation of the valuable component from the impurities is necessary to obtain a pure solution of the target component. There are several separation methods, such as solvent extraction, ion exchange, precipitation and cementation. Solvent extraction and ion exchange are widely employed for the separation of chemically similar ions in the solution. Ion exchange is employed when the concentration of the impurities is less than 100 ppm [1]
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