An improved purification method for preparation of basic nickel carbonate of high purity via chemical precipitation

Abstract

The adsorption mechanism of Na⁺, Cl⁻ and other impurities on the surface of basic nickel carbonate was clarified by electric double layer model. Based on the mechanism, a new purification method was studied. The method can be described as washing-drying-rewashing-drying. The experimental results indicate that the process is very efficient to remove impurities adsorbed by the precipitate when using NiCl₂ and Na₂CO₃ as the raw materials. The finished product’s contents of sodium and chlorine are both less than 0.01 wt%.

Keywords

basic nickel carbonate / purification / electric double layer / adsorption / chemical

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