Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Production of High-purity Gold from Zinc Precipitates and Steel Wool Cathodes by Hydrometallurgical Refining.

Authors
McClelland-GE; Wroblewski-MD; Eisele-JA
Source
MISSING :11 pages
Link
NIOSHTIC No.
10004333
Abstract
The Bureau of Mines investigated chemical methods for producing high- purity gold from precious-metal-bearing zinc precipitates and steel wool cathodes. Precious-metal-bearing zinc precipitates and steel wool cathodes are unrefined products from conventional cyanidation and heap leaching-cyanidation operations. The zinc precipitates contained 14.40 pct au and 0.35 pct ag. The precious-metal-bearing steel wool cathodes contained 20.65 pct au and 4.84 pct ag. The precipitates and cathodes were treated with dilute acid to solubilize the silver and/or base metals. The gold-bearing residue was leached in dilute aqua regia to solubilize the gold. High- purity gold was precipitated from the aqua regia solution with oxalic acid, sulfurous acid, sodium bisulfite, and gaseous sulfur dioxide. The leaching-precipitation experiments recovered 99.9 pct of the gold. The gold precipitates ranged in fineness from 997 to 999 fine. The chemical refining method provides a viable technique for the smaller operator to produce high-purity gold without using pyrometallurgical refining methods.
Publication Date
19850101
Document Type
IH; Information Circular;
Fiscal Year
1985
NTIS Accession No.
NTIS Price
Identifying No.
IC 9002
NIOSH Division
RERC;
Source Name
MISSING
TOP