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

Malononitrile Extraction of Gold from Ores.

Authors
Heinen-HJ; Eisele-JA; Scheiner-BJ
Source
NTIS: PB 196 691 :11 pages
Link
NIOSHTIC No.
10009213
Abstract
Malononitrile [ch2(cn)2], which forms a carbanion in basic solutions, was investigated as a potential leachant for gold and was shown to be an effective extractant in alkaline pulps. Malononitrile was comparable to equal molar quantities of sodium cyanide (nacn) in leaching gold from an oxide ore and yielded 10 to 20 percent higher recovery in leaching a refractory carbonaceous ore, although dissolution was slower with malononitrile than with cyanide. Complete recovery of the gold from the pregnant solutions was achieved by coprecipitation with a lead salt on zinc dust; the leachant was shown to be capable of regeneration and recycling a limited number of times. Addition of an anion-exchange resin to the carbonaceous pulp containing malononitrile increased gold recovery from 67 to 95 percent. Some malononitrile derivatives were also shown to be gold solvents.
Publication Date
19700101
Document Type
IH; Report of Investigations
Fiscal Year
1970
NTIS Accession No.
PB-196691
NTIS Price
A03
Identifying No.
RI 7464
NIOSH Division
RERC;
Source Name
NTIS: PB 196 691
TOP