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钴和镍是性质相近的过渡金属.它们之间的分离是否彻底?是提高镍、钴回收率及其产品质量优劣的重要标志.据资料报导P_(507)是目前各国正在研究使用的一种具有高效镍、钴分离系数的酸性磷型萃取剂.在高浓度镍钴混合液中,经试验P_(507)对Co的萃取率在pH=4.8时达最高峰,其萃取率为99.9%.但对P_(507)萃取相中的大量钴如何使它释放出来?还未见报导,为此我们进行了一系列探索性试验,实验表明:在盐酸(2N)介质中,反萃其中的Co,并利用电位滴定法进行测定获得成功.方法准确、快速.测定范围为4～110g/升.一、仪器与主要试剂:ZD—2型自动电位滴定仪及铂、钨电极各一支;铁氰化钾标准液;称取铁氰化钾43.86g,溶于少量蒸馏水中,过滤于10升棕色下
Cobalt and nickel are transition metals with similar properties. Whether the separation between them is complete or not is an important indicator to improve the recovery rate of nickel and cobalt and the quality of their products. According to the report P_ (507) is currently being studied in all countries In the high concentration of nickel and cobalt mixture, the extraction rate of Co by P_ (507) reaches the peak at pH = 4.8, the extraction rate is 99.9% However, a large amount of cobalt in the P_ (507) extraction phase has been released from it. We have not reported yet. We conducted a series of exploratory experiments for this purpose. The experimental results show that in the hydrochloric acid (2N) medium, stripping Co, and the use of potentiometric titration was successful. The method is accurate and fast. The determination range of 4 ~ 110g / L. First, the instrument and the main reagents: ZD-2-type potentiometric titrator and platinum, Potassium ferricyanide standard solution; weigh potassium ferricyanide 43.86g, dissolved in a small amount of distilled water, filtered under 10 liters of brown