球形镍氧化物制备硫酸镍的方法研究

以球形镍氧化物为原料,研究了制备高纯硫酸镍的方法。首先借助X射线衍射仪（XRD）和X射线光电子能谱仪（XPS）对球形镍氧化物的主要成分进行表征,确认其主要成分为氧化镍;其次对球形镍氧化物浸取制备较高纯度的硫酸镍条件进行了优化,确立了硫酸浓度为1.84 mol/L、反应温度为200 ℃、固液比为0.3 g/mL、反应时间为6 h为最优反应条件;最后利用高温条件下（250 ℃）获得的一水合硫酸镍固体,提出了将其再次溶解生产pH和镍浓度可控的高纯硫酸镍溶液的方法。

Preparation method of nickel sulfate from spherical nickel oxide

The preparation method of high purity nickel sulfate was disclosed basing on the spherical nickel oxide.Firstly,the components of spherical nickel oxide were characterized by the powder of X-ray diffraction and X-ray photoelectron spectro-scopy.The major component was nickel oxide.Then the optimal conditions of leaching nickel oxide into nickel sulfate were established,and the optimal conditions were 1.84 mol/L sulphuric acid,200 ℃,solid-liquid ratio 0.3 g/mL and reaction time 6 h.Finally,high refined nickel sulfate solution with controllable pH value and nickel concentration,could be obtained by re-dissolving of nickel sulfate monohydrate, which was the byproduct obtained at the higher temperature（250 ℃）.