Kumar, Rakesh and Biswas, A K (1986) Zinc recovery from zawar ancient siliceous slag. Hydrometallurgy, 15 . pp. 267-280.
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Abstract
Zinc is found to exist in Zawar ancient slag in India mainly as the silicate phases hemimorphite, Zn4(OH)2Si2OT"H20, and willemite, Zn2SiO4, and also as the hydroxycarbonate phase hydrozincite, Zns(CO3)2(OH) ~. Various processing techniques show that the non-silicate mineral can be easily leached by acid. Willemite and the hemimorphite phase can also be leached by acid. However, zinc recovery apparently is poor; this phenomenon has been ascribed to chelation or adsorption of Zn 2÷ by colloidal/polymeric silicic acid. Neutralisation, coagulation and precipitation of silicic acid by A13÷ ions distinctly improve zinc recovery. The "fast leaching" technique, which makes use of the water-starved nature of the silicate--acid system shows distinct promise. Recovery of zinc of more than 80% is reported.
| Item Type: | Article |
|---|---|
| Official URL/DOI: | http://sciencedirect.com |
| Uncontrolled Keywords: | Zinc; Siliceous slag; |
| Divisions: | Metal Extraction and Forming |
| ID Code: | 2419 |
| Deposited By: | INVALID USER |
| Deposited On: | 28 Jan 2011 10:04 |
| Last Modified: | 15 Nov 2011 14:21 |
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