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:
Feb. 15, 1983
Filed:
Jun. 21, 1982
Applicant:
Inventors:
Guy W Lussiez, Golden, CO (US);
Mahesh C Jha, Arvada, CO (US);
Assignee:
Amax Inc., Greenwich, CT (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01G / ; C23F / ;
U.S. Cl.
CPC ...
423150 ; 203-7 ; 252 80 ; 75119 ; 134-3 ;
Abstract
In the high-pressure sulfuric acid leaching of nickeliferous oxide and silicate ore, there is a tendency for the formation of scale on autoclave surfaces. The scale comprises oxides and sulfates of metals selected from the group consisting of aluminum, iron, silicon and magnesium. The scale is chemically removed by flushing the autoclave following completion of a leaching regime with a sulfuric acid solution containing about 20 to 100 gpl H.sub.2 SO.sub.4 at a temperature of about 150.degree. C. to 250.degree. C. and a pressure ranging from about 54 psig to 562 psig for a time sufficient to effect substantial removal of the scale.