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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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
Uncontrolled Keywords: Zinc; Siliceous slag;
Subjects: Metallurgy
Divisions: Metal Extraction and Forming
Depositing User: Users 6 not found.
Date Deposited: 28 Jan 2011 04:34
Last Modified: 02 Sep 2026 19:25
URI: http://eprints.nmlindia.org/id/eprint/2419

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