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:
May. 29, 2012
Filed:
Jun. 25, 2007
Vanessa Macedo Torres, Minas Gerais, BR;
Marcelo Augusto Castro Lopes Da Costa, Minas Gerais, BR;
Omar Antunes DO Carmo, Minas Gerais, BR;
Salomão Solino Evelin, Minas Gerais, BR;
Vanessa Macedo Torres, Minas Gerais, BR;
Marcelo Augusto Castro Lopes da Costa, Minas Gerais, BR;
Omar Antunes do Carmo, Minas Gerais, BR;
Salomão Solino Evelin, Minas Gerais, BR;
Other;
Abstract
The present invention concerns a process for the instantaneous control of the precipitation of nickel and cobalt present in a leach liquor by adjustment of the pH-value. Said leach liquor is obtained by pressurized acidic leaching of laterite ores and additionally contains aluminium, ferric and ferrous iron and chromium among others. The process comprises the following steps: precipitation of aluminium, ferric and ferrous iron, chromium etc. by increasing the pH-value by adding a suitable reagent such as lime and/or limestone, following precipitation of nickel and cobalt by further increasing the pH-value of the liquor, finally separating the precipitate from the low-content nickel and cobalt solution. The nickel and cobalt precipitate can be used for further refinement. In order to keep the process conditions constant, the steps of increasing the pH-value are controlled simultaneously.