The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2002
Filed:
Oct. 24, 2000
Applicant:
Inventor:
Jan-Eric Sundkvist, Skellefteå, SE;
Assignee:
Boliden Mineral AB, , SE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22B 3/06 ; C22B 1/100 ;
U.S. Cl.
CPC ...
C22B 3/06 ; C22B 1/100 ;
Abstract
A method of increasing the leaching yield of gold in the cyanide treatment of refractory ores or concentrates of such ores, while delivering air in an alkaline environment at atmospheric pressure, wherein gold present in said ores or concentrates is bound as tellurides. The method is characterised by carrying out the cyanide treatment at a temperature above room temperature, up to a temperature immediately beneath the boiling point of the leaching liquid. The treatment is suitably carried out at a temperature of 60-80° C., and at a pH between 10 and 12.