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测定Ni(OH)_2电化学氧化产物中的镍(Ⅲ)量,对于镍钴分离的冶金工艺研究,具有重要的指导作用.由于镍(Ⅲ)在通常条件下不稳定,所以镍(Ⅲ)的准确测定有很大困难.本文拟定了常量镍(Ⅲ)的测定方法—碘化钾-硫代硫酸钠容量法,对其应用条件进行了较详细的考察.方法原理:在适当酸性介质中,三氢氧化镍可迅速与碘化钾作用而被溶解,同时析出等当量的碘,以淀粉作指示剂,用硫代硫酸钠标准溶液滴定析出的碘,可间接求得镍(Ⅲ)的量,其反应为
Determination of Ni (OH) 2 electrochemical oxidation products of nickel (Ⅲ) amount of nickel and cobalt for the separation of metallurgical process has an important guiding role because nickel (Ⅲ) under normal conditions instability, so nickel (Ⅲ) Of the accurate determination of great difficulties.This paper developed a constant nickel (Ⅲ) determination method - potassium iodide - sodium thiosulfate volumetric method, its application conditions were investigated in more detail.Methods: In the appropriate acidic medium, the three Nickel hydroxide can be quickly dissolved with potassium iodide, while precipitation equivalent iodine, starch as an indicator, with sodium thiosulfate standard titration of iodine precipitation, can be indirectly obtained by the amount of nickel (III), the reaction for