A concentration process of zinc silicated minerals, particularly willemite and calamine concentration, by single operations, or conventional steps of ore treatment, some of which include the following: Preparation of stockpiles of different mineralogical and contents compositions, crushing, screening, storage, dense separation, washing, homogenization, magnetic separation, grinding, classification, rubbing, conditioning, flotation, thickening, filtering, calcination, storage and waste deposition.

 
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> Positive electrode active material, non-aqueous electrolyte secondary battery and method for producing positive electrode active material

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