利用共沉淀-共还原方法制备FeNi_(27)Co_3触媒粉的研究

Preparation of catalyst powder FeNi_(27)Co_3 by using co-precipitation-decomposition method

介绍了利用化学共沉淀-共还原方法制备FeNi27Co3触媒粉的过程,研究了pH值、金属离子浓度、加料速度、添加剂用量对沉淀物产生和粒度的影响,确定出工艺条件为:溶液pH值为3左右,沉淀物450℃煅烧3h,然后再通过650℃氢气还原3h;并得到了D50约为9μm,氧含量为0.418%,铁、镍、钴的质量比为68.9∶26.5∶3.57的触媒粉末;最后,进行了金刚石合成实验并与气雾化触媒合成金刚石的效果进行了对比。

This paper introduces the method of preparation of catalyst powder FeNi27Co3 by the way of co-precipitation-decomposition, and studies the influence of pH value, metal ion concentration, feed rate and the amount of additives on sediment formation and particle size. As a result, the technical conditions have been confirmed as followed： pH value is about 3. Sediment is calcined at 450℃ for 3 hours and then is reduced by hydrogen at 650℃ for 3 hours. The catalyst powder which contains 9μm D50, 0. 418% oxygen content and 68. 9 ： 26.5 ： 3.57 of Fe-Ni-Co quality ratio can be obtained. Finally, the test of synthesizing diamond has been carried out and the test result has been compared with the effect of synthesizing catalyst by gas atomization.