Magnesium recycling and sulphur recovery in leaching of...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/06 (2006.01) C22B 3/20 (2006.01) C22B 23/06 (2006.01)

Patent

CA 2752254

The present invention resides in a process of recovering nickel and cobalt, regenerating the main raw materials, said process including the steps of: granulometric separation; leaching; neutralization; MHP production in only one stage and the pressure crystallization of magnesium sulphite. The process proposes a way to recovery nickel and cobalt from laterite ores through the atmospheric and heap leaching with staged addition of ore - by size separation - and H2SO4, decreasing the nickel losses and simplifying the neutralization circuit and producing a more purified MHP. The present process route is employed for nickel extraction, including the one from high magnesium containing lateritic ores.

La présente invention concerne un procédé de récupération de nickel et de cobalt, la régénération des principales matières premières, ledit procédé comprenant les étapes suivantes : la séparation granulométrique ; la lixiviation ; la neutralisation ; la production de lhydroxyde de magnésium en poudre en une seule étape et la cristallisation sous pression du sulfite de magnésium. Le procédé propose une technique de récupération de nickel et de cobalt à partir de minerais latéritiques par lixiviation atmosphérique en tas avec laddition par étapes de minerai par la séparation selon la taille et du H2SO4, permettant la réduction de pertes de nickel et la simplification du circuit de neutralisation et la production de lhydroxyde de magnésium en poudre mieux épuré. Le procédé selon la présente invention est utilisé pour lextraction du nickel, comprenant du nickel dérivé de minerais latéritiques à teneur élevé en magnésium.

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