Minerals Engineering, Wol. 6. No. 3, pp. 339-340, 1993 0892-6875/93 $6.00+0.00 Printed in Great Britain Pergamon Press Ltd
This section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent application filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the PATSEARCH ~ online database in accordance with interest profiles developed by the Editors.
Further information about online patent searching can be obtained from Research on Demand, Inc., 2421 Fourth Street, Ste. C., Berkeley, CA 94710, U.S.A. [Tel. 510-841 1145; Fax 510-841 6311].
P R O C E S S F O R T R E A T I N G O R E H A V I N G R E C O V E R A B L E G O L D
V A L U E S A N D I N C L U D I N G A R S E N I C - , C A R B O N - A N D
S U L F U R - C O N T A I N I N G C O M P O N E N T S B Y R O A S T I N G I N
A N O X Y G E N - E N R I C H E D G A S E O U S A T M O S P H E R E
Rene R Fernandez, K Le Vier, Anthony L Han- naford, Gopalan Ramadorai assigned to New- mont Mining Corporation; Newmont Gold Compa
Recovery of a precious metal value from refrac- tory carbonaceous and sulfidic ores, con- centrates or tailings which also include arsenic- containing components is improved by roasting the ore or ore concentrate in an oxygen-enriched gaseous atmosphere having an initial oxygen content from about 25 percent (by volume) to about 65 percent (by volume) while maintaining a reaction temperature of less than about 600 degrees Celsius during the roasting and while maintaining a minimum amount of iron to react with arsenic and for forming ferricarsenate; thereafter recovering a thus-roasted ore as cal- cine, whereby the calcine is amenable to recovery of precious metal values in it; gold ores are pre- ferred candidate ores.
M E T H O D O F E X T R A C T I O N O F V A L U A B L E M I N E R A L S A N D
P R E C I O U S M E T A L S F R O M O I L S A N D S O R E B O D I E S A N D O T H E R
RELATED ORE BODIES
John S Rendall, Valentine W Vaughn assigned to Solv-Ex Corporation
A method for the extraction of valuable minerals and precious metals from oil sands ore bodies or other related ore bodies that is synergistically unique in the arrangement of processes for pro- duction of valuable minerals and precious metals in an economically and environmentally ac- ceptable manner. The oil sands ores from oil sands ore bodies and other related ores from other related ore bodies including overburden and interburden mineral ores are crushed, the hydrocarbons, if any exists in worthwhile quan- tities, are recovered and the resulting coarse sands, other related ores and fines streams are processed in a definite sequence using known processes to recover the valuable minerals and precious metals values. All reactants and rea- gents, including water, are recycled in the method and tailings ponds are not required. Heat recovery is used extensively to cogenerate almost all of the process steam and process elec- trical requirements for the method. The spent damp coarse sands and spent damp fines are stockpiled and/or returned to the mine.
F R O T H F L O T A T I O N O F S I L I C A O R S I L I C E O U S G A N G U E
Richard Klimpel assigned to The Dow Chemical Company
Silica and siliceous gangue are separated from desired mineral values, particularly iron and phosphate, by reverse froth flotation in the pre- sence of amine collectors and effective amounts of alkanol amines such as diethanol amine.