Obtaining nickel(II) hydroxide for rechargeable batteries from multi-component aqueous solutions: effect of synthesis conditions
Keywords:
nickel hydroxide, co-precipitation, Caron process, rechargeable batteries.Abstract
Nickel(II) hydroxide is used in rechargeable batteries. This compound can be obtained from the sulfate solution resulting from the leaching of nickel sulphide that is obtained by processing lateritic ores by using Caron technology. The purpose of this work is to evaluate the influence of the variables: temperature, concentration of reagents, pH and stirring intensity, on the chemical-physical characteristics of nickel (II) hydroxide obtained by the way previously described. The chemical co-precipitation with ammonium and sodium hydroxides was used and the hydroxide was characterized, determining the chemical composition, the apparent density, the mineralogical phases as well as the specific surface area. Atomic absorption spectrophotometry, X-ray diffraction and the nitrogen adsorption method (BET) were the used techniques. It was determined that the evaluated variables have an similar effect to the results obtained with high purity nickel solutions, and they positively influence the nickel content in the hydroxide, the apparent density, and the specific surface area; It is obtained beta nickel hydroxide as the main mineralogical phase with satisfactory values of the studied properties, except the apparent density, for possible use in rechargeable batteries.Downloads
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