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利用2(2-乙基已基)磷酸(D2EHPA)和2(2-乙基已基醛肟(EHO)的混合物,对萃取硫酸铵溶液中的镍进行了研究,给出了这两种体系的萃取和反萃取平衡等温线,以及小型多级混合澄清器中连续逆流操作的比较试验数据,每批试验都持续40小时。D2EHPA体系的缺点是在镍的有效萃取pH范围内,发生了大量的氨被共萃取,从而导致了氨和反萃取酸的耗量高,而且在反萃取液中,还会沉淀出硫酸镍铵复盐。采用D2EHPA—EHO混合体系时,可在很低的pH值范围内萃取镍,因此,实际上消除了氨的共萃取。用电解法可从溶剂萃取试验中制得的反萃取液中获得质地优良的沉积镍。
Nickel from the extraction of ammonium sulfate solution was studied using a mixture of 2 (2-ethylhexyl) phosphoric acid (D2EHPA) and 2 (2-ethylhexyl aldoxime (EHO) Of the extraction and back-extraction equilibrium isotherm, as well as the comparative test data of continuous countercurrent operation in a small multi-stage mixer-settler, each batch of test lasted 40 hours.The disadvantage of D2EHPA system is that in the effective pH range of nickel extraction, a large amount of Of ammonia is co-extracted, resulting in a high consumption of ammonia and stripping acid, but also in the stripping solution, ammonium sulfate ammonium salt is also precipitated.When using D2EHPA-EHO mixed system, at a very low pH Value of the nickel extraction, thus virtually eliminating the co-extraction of ammonia.Electrolysis can be obtained from the solvent extraction of the stripping solution obtained from the nickel-rich texture of the deposition.