球磨时间对快堆MOX粉末搅拌球磨效果的影响

Effect of Milling Time on the Stirring Ball Milling of Fast Reactor MOX Powder

在前期球磨实验确定的不同物料搅拌转速基础上,在不同球磨时间条件下,对MOX粉末进行搅拌球磨工艺的研究工作。通过激光粒度仪、库仑仪分别对球磨过的MOX混合粉末粒度、钚分布均匀度的变化情况进行测试。实验结果表明:当球磨时间过短时,球磨效果不佳,粉末粒度较大,均匀性不佳;随着球磨时间的延长,粉末粒度逐渐减小,钚分布均匀性逐步改善;当球磨时间过长时,粉末粒度达到极限粒度后,粒度会增大,钚分布均匀度变化不明显,趋向于均匀化分布。在现有实验条件下,最合理的球磨工艺为:对于MOX原料粉末,在600r/min转速下,球磨2.5h;对于经过煅烧处理过的MOX混合粉末,以800r/min的转速处理3h。采用上述工艺制备获得的粉末粒度<1μm,均匀度≥98%,满足指标控制的要求。

During the ball milling experiment in the early stage,the stirring speed of different materials was determined.Under different milling time,the ball milling process of MOX powder was studied respectively in this paper.The granularity of milled MOX mixed powders was tested by laser granularity detector.The variations of plutonium distribution homogeneity in milled MOX mixed powders were tested by a coulometric meter.The results showed that the milling effect was poor when the milling time was too short.The particle size of powder was large.The homogeneity is poor.With the extension of milling time,the granularity of powder decreased,and the distribution of plutonium was more homogenized.When the ball milling time was too long,the particle would increase after the powder particle size reached the limit granularity.The homogeneity of plutonium was not obvious and tended to be homogenized.Under the existing experimental conditions,the most reasonable ball milling process for MOX raw powder was milling at 600r/min for 2.5 hours.For the calcined MOX mixed powders,the most reasonable ball milling process was 800r/min milling3 hours.The granularity of the powder obtained by the above process was less than 1 micron.The plutonium distribution homogeneity was greater than or equal to 98%.The above indexes met the requirements of quality control.