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Selective flocculation of zinc concentrate to reduce silica contamination.

Authors
Hirt-WC; Rice-DA; Gum-K
Source
SME Annual Meeting, February 15-18, 1993, Reno, Nevada. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., preprint 93-142, 1993 Feb; :1-9
Link
NIOSHTIC No.
10003850
Abstract
Selective flocculation was used to produce superclean zinc concentrate with minimized silica contamination. Research was carried out on a flotation concentrate from the Jersey Miniere Zinc Company (JMZ) in Gordonsville, Tennessee. The material was first dispersed with sodium silicate and then causticized tapioca starch was used to selectively flocculate the sphalerite, leaving the silica in suspension. This technique has been applied commercially to iron ore beneficiation but has never been used for processing zinc. The feed material assayed 0.45% Si02. Use of 0.56 kg/tonne (1.13 lb/st) of sodium silicate and 0.070 kg/tonne (0.141 lb/st) of causticized tapioca starch resulted in 98.2% zinc recovery in a purified zinc concentrate assaying 66.0% Zn and 0.24% silica. The present target level for silica contamination in JMZ zinc concentrates is 0.3% Si02. This work has shown that selective flocculation offers a potential method for cleaning flotation concentrates, particularly where low silica products are required.
Keywords
Mining-industry; Zinc-compounds; Silica-dusts
CAS No.
7440-66-6; 7631-86-9
Publication Date
19930201
Document Type
Conference/Symposia Proceedings
Fiscal Year
1993
NTIS Accession No.
NTIS Price
Identifying No.
OP 32-93
NIOSH Division
SLRC
Source Name
SME Annual Meeting, February 15-18, 1993, Reno, Nevada
State
UT; NV; TN
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