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:
Jun. 25, 2002
Filed:
Nov. 19, 1999
Applicant:
Inventors:
Ricardo Arancibia Cifuentes, Santiago, CL;
Donald C. Roe, Jamison, PA (US);
Jorge Vergara Chavez, Chuquicamata, CL;
Andres Reghezza Inzunza, Chuquicamata, CL;
Assignee:
Betzdearborn Inc. & Corporacion Nacional del Cobre de Chile, Trevose, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 1/100 ; B01F 1/00 ; C21B 1/500 ; C22B 1/500 ;
U.S. Cl.
CPC ...
B01D 1/100 ; B01F 1/00 ; C21B 1/500 ; C22B 1/500 ;
Abstract
Methods for enhancing the leaching of copper from copper bearing ores with an aqueous sulfuric acid leach solution are disclosed wherein an antifoam formulation stable at a solution pH of about 1 to 2 is added. A preferred antifoam formulation comprises a glycol ester and an alkyl phenol ethoxylate in a paraffinic oil solvent added to the aqueous sulfuric acid leach solution.