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用2-乙基-1-己基磷酸单2-乙基-1-己基脂(M2EHPA)从硫酸镍溶液中分离钴的方法进行了研究。M2EHPA的分离系数比D2EHPA大很多倍(D2EHPA是熟知的一种阳离子交换萃取剂)。 使用3级混合澄清装置,将含20％(体积)M2EHPA的有机试剂与含30克/升镍和12克/升钴的原始水溶液接触后,能获得这样的结果:萃余相含29.9克/升镍和0.002克/升钴,萃取相含0.14克/升镍和12克/升钴。将萃取相与含有CoSO_4的洗涤液混合,能有效地从有机相中除掉镍;与稀硫酸溶液接触很容易从有机相中反萃取出钴。在工业性设备中,是使用钴电解工序的废电解液作为反萃取液。使用N.M.C.法,反萃取液中的钴浓度被控制在100克/升左右。 根据本研究的结果,建立了一种分离钴和镍的方法。日本矿业公司利用这种方法,目前已能有效地分别生产出1300吨/年和3300吨/年高纯的钴和镍。
A method for separating cobalt from nickel sulfate solution with 2-ethyl-1-hexylphosphate mono-2-ethyl-1-hexyl lipid (M2EHPA) was studied. The separation factor of M2EHPA is many times greater than that of D2EHPA (D2EHPA is a well known cation exchange extractant). Using a 3-stage mixer and clarification unit, an organic reagent containing 20% by volume of M2EHPA was brought into contact with a raw aqueous solution containing 30 g / l of nickel and 12 g / l of cobalt to obtain the result that the raffinate phase contained 29.9 g / L of nickel and 0.002 g / l of cobalt. The extract phase contained 0.14 g / l of nickel and 12 g / l of cobalt. The extraction phase is mixed with the wash liquor containing CoSO_4 to effectively remove nickel from the organic phase; the cobalt is stripped back from the organic phase by contact with a dilute sulfuric acid solution. In industrial equipment, waste electrolytes in the cobalt electrolysis process are used as the stripping solution. Using the N.M.C. method, the concentration of cobalt in the stripping solution is controlled at about 100 g / l. According to the results of this study, a method of separating cobalt and nickel was established. Japanese mining companies using this method, has been able to effectively produce 1,300 tons / year and 3,300 tons / year of high purity cobalt and nickel.