二水草酸镍在空气中热分解过程的研究

Research on process of pyrolytic decomposition of NiC_2O_4 ·2H_2O in the air

通过热重差热分析仪和激光粒度分析仪对二水草酸镍在空气中热分解过程进行分析,研究结果表明：二水草酸镍在空气中的热分解过程经历了两个阶段,在175~275℃二水草酸镍失去结晶水;从325~400℃NiC2O4被热分解为氧化镍。二水草酸镍在空气中热分解制备氧化镍过程中,在246.5~357.8℃,二水草酸镍在空气中热分解产物的粒径变化最大;在357.8~400.0℃,二水草酸镍在空气中热分解产物的粒径变化次之。因此,为了制备出超细的氧化镍,可以分段性地控制二水草酸镍的热分解条件。

Process of pyrolytic decomposition of NiC2O4·2H2O in the air was investigated by TG-DSC and laser granulometry.Results showed that there were two stages in the process of pyrolytic decomposition of NiC2O4 ·2H2O in the air.Firstly,the crystal water in NiC2O4·2H2O was lost at 175~275 ℃.Secondly,NiC2O4 was decomposed into NiO at 325~400 ℃.At the same time,the change of the particle size of pyrolytic decomposition product was the largest at 246.5~357.8 ℃ and the change was less at 357.8~400.0 ℃.Therefore,in order to prepare ultra-fine NiO powder the pyrolytic decomposition conditions of NiC2O4·2H2O can be controlled by stages.