PROCESO PARA EL CONTROL INSTANTÁNEO DE PRECIPITACIÓN DE NÍQUEL Y COBALTO PRESENTES EN EL LICOR PERMEADO, MEDIANTE EL AJUSTE DEL PH DE LA SOLUCIÓN

• Main Authors: SALOMAO SOLINO EVELIN, MARCELO AUGUSTO CASTRO LOPES DA, OMAR ANTUNES DO CARMO, VANESSA MACEDO TORRES
• Format: Patent
• Language: Spanish
• Published: 31.05.2010

The present invention is directed to a process for the instantaneous control of precipitation of nickel and cobalt present in the leach liquor, by adjusting the pH of the solution, which process comprises the steps of adjusting the pH of a leach liquor containing nickel, cobalt and other elements dissolved in the acidic leaching process under pressure, since the balanced io concentration in solution of the elements that should be precipitated (nickel and cobalt) varies as a function of the pH, so that said adjustment takes place after the leach liquor solution is subjected to at least a previous step of selective precipitation of aluminum, ferric iron, ferrous iron, chromium, among others, by adjusting the pH through the use of a suitable reagent such as lime and/or limestone; by carrying out a second adjustment of the pH an instantaneous precipitation control of nickel and cobalt is accomplished, and as a consequence the nickel and cobalt will precipitate from said leach liquor; such precipitated material separated from the low nickel and cobalt solution will be used in refineries for the recovery of such elements later on.