Solvent Extraction Technology for Nickel

As an important technology for improving the efficiency of impurity removal in traditional smelting processes or as a high-purity extraction technology for intermediate products, solvent extraction can be used. To improve the purity of nickel, the key is how to remove one of the extremely difficult impurities to separate - cobalt. In this sense, solvent extraction is also an important technology for extracting high-purity nickel. Although solvent extraction can preferentially and effectively remove impurities from nickel salt aqueous solutions, there are not many types of extractants that can be used in industry.

PC-88A and CYANEX-272 can be used as practical extractants when using solvent extraction to remove impurities coexisting in nickel sulfate aqueous solution. Regardless of the type of extractant, it is necessary to dilute it with an organic solvent to an appropriate concentration of solution as the organic phase, allowing it to mix and come into contact with the raw material nickel sulfate solution (aqueous phase). Impurities in the aqueous phase, such as diamond ions, are extracted and removed into the organic phase by forming complexes with the extractant of the organic phase.

For example, when extracted at pH 5-6, difficult to separate and remove drilling ions are easily extracted into the organic phase, while nickel ions remain in the aqueous phase. It can also be indicated that if Fe, Zn, Al, Cu, Mn, Mg, and Ca plasmas coexist as impurities at this time, they can be extracted and removed together with the drill. In this way, solvent extraction is an excellent refining method that can simultaneously remove various impurities.

Nickel chloride is another important salt in nickel intermediate products. The use of tertiary amines as extractants can remove impurities cobalt coexisting in nickel chloride through solvent extraction. The mechanism of extracting cobalt from nickel chloride solution using tertiary amines is that the chloride anion of cobalt forms ion pairs with the tertiary amines diluted to an appropriate concentration in organic solvents.

For example, in a nickel chloride solution with a chloride ion concentration of 280-300g/L, diamonds coexisting in the form of impurities can be preferentially extracted and removed from the organic phase, while nickel remains in the aqueous phase. Moreover, if impurities such as Zn, Fe, Cu, Mn coexist at this time, they can also be extracted and removed together with the drill.

In this way, if solvent extraction technology is used, drilling and other impurities in nickel sulfate or nickel chloride solutions can be simultaneously extracted and removed, and high-purity nickel higher than existing purity can be obtained from refined nickel acetate or nickel chloride solutions through electrolytic reduction.

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