Zinc recovery from zawar ancient siliceous slag

Kumar, Rakesh and Biswas, A K (1986) Zinc recovery from zawar ancient siliceous slag. Hydrometallurgy, 15 . pp. 267-280.

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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 On:28 Jan 2011 10:04
Last Modified:15 Nov 2011 14:21
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