A process for the instantaneous control of precipitation of...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/44 (2006.01) C22B 3/04 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2656951

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.

La présente invention concerne un procédé permettant le contrôle instantané, par ajustement du pH, de la précipitation du nickel et du cobalt présents dans un lixiviat. Ledit lixiviat résulte de la lixiviation acide sous pression de minerais latéritiques et il contient également de l'aluminium, du fer sous forme ferrique et ferreuse et du chrome, entre autres. Le procédé comprend les étapes suivantes : précipitation de l'aluminium, du fer ferrique et ferreux, du chrome et des autres éléments par augmentation du pH, ladite augmentation étant obtenue par ajout d'un réactif approprié tel que de la chaux et/ou de la castine ; précipitation du nickel et du cobalt en augmentant encore le pH du lixiviat ; enfin séparation du précipité de la solution à faible teneur en nickel et cobalt. Le précipité de nickel et de cobalt peut être soumis à un raffinage ultérieur. Les étapes d'augmentation du pH sont simultanément contrôlées, afin de garder constantes les conditions du procédé.

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