Method and apparatus for separating metal values

C - Chemistry – Metallurgy – 22 – B

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C22B 23/00 (2006.01) B03C 1/00 (2006.01) B03C 1/005 (2006.01)

Patent

CA 2476784

Methods and apparatuses for separating metal values, such as nickel and nickel compounds, from mineral ores, including lateritic ores are disclosed. The method includes providing a mixture of particles (e.g., crushed and sized ore) that is composed of at least a first group of particles and a second group of particles. Group members have similar chemical composition, while particles belonging to different groups have dissimilar chemical compositions. The mixture of particles is exposed to microwave/millimeter wave energy in order to differentially heat the first and second group of particles, thereby increasing differences in magnetic susceptibility between the first and second gorup of particles. The mixture of particles is then passed through a magnetic field gradient, which causes the particles to separate into magnetic and non- magnetic fractions.

l'invention concerne des procédés et des appareils de séparation de valeurs de métal, notamment de nickel et de composés de nickel, à partir de minerais, y compris de minerais latéritiques. Le procédé consiste à apporter un mélange de particules (p.ex. minerai concassé et dimensionné) composé d'au moins un premier groupe de particules et d'un second groupe de particules. Des éléments de groupe présentent une composition chimique semblable, alors que les particules appartenant à différents groupes possèdent des compositions chimiques dissemblables. Le mélange de particules est exposé à une énergie d'onde micro-onde/millimétrique de manière à chauffer de manière différentielle le premier et second groupes de particules, augmentant ainsi les différences en termes de susceptibilité magnétique entre le premier et second groupes de particules. Le mélange de particules est ensuite soumis à une gradient de champ magnétique, qui sépare les particules en fractions magnétiques et non magnétiques.

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