摘要
钼粉的性能因逐步遗传而受一次还原和二次还原工艺影响,一次还原产物的性能会一定程度保留并传递至钼粉。本研究通过对MoO_(3)在氢气氛围中还原成MoO_(2)过程进行热重分析(TG)和差热分析(DTA),并对比一次还原不同温度工艺和不同料层厚度工艺,研究温度和料层厚度对一步还原产物MoO_(2)和最终产物Mo粉的形貌、费氏粒度、堆积密度和振实密度的影响。结果表明:一步还原反应为放热反应,反应的最低起始温度为530℃;当反应温度低于530℃,一步还原反应产物主要为针状的Mo_(4)O_(11),且费氏粒度、堆积密度和振实密度偏大;温度高于530℃,一次还原可生成均匀片状的MoO 2;当料层厚度增加,还原产物MoO_(2)和Mo粉的费氏粒度、堆积密度和振实密度均增加;从形貌上看,随着料层厚度增加,MoO_(2)中的针状“过还原”产物增加。
The properties of molybdenum powder are influenced by the primary and secondary reduction processes through stepwise inheritance,with the characteristics of primary reduction products being partially retained and transmitted to the final molybdenum powder.This study investigated the effects of temperature and material layer thickness on the morphology,Fisher particle size,bulk density,and tap density of both primary reduction productMoO_(2)and final molybdenum powder.Thermogravimetric analysis(TG)and differential thermal analysis(DTA)were employed to examine the reduction process of MoO_(3)to MoO_(2)in a hydrogen atmosphere.Comparative experiments were conducted using different temperature parameters and material layer thicknesses during primary reduction.Results demonstrate that the primary reduction is an exothermic reaction with a minimum initiation temperature of 530℃.Below this temperature,the primary reduction product mainly consists of acicular Mo_(4)O_(11)accompanied by larger Fisher particle size,bulk density,and tap density.Above 530℃,uniformly flaky MoO_(2)can be obtained.Increasing material layer thickness enhances the Fisher particle size,bulk density,and tap density of both MoO_(2)and Mo powders.Morphological analysis reveals that thicker material layers lead to increased formation of acicular“over-reduction”products in MoO_(2).
作者
冯永山
李诵斌
谢琨
吴俊勇
谌日葵
李舒洋
刘孝青
FENG Yongshan;LI Songbin;XIE Kun;WU Junyong;CHEN Rikui;LI Shuyang;LIU Xiaoqing(Key Laboratory of Rare&Scattered Metal Materials in Jiangxi Province,Nanchang 330096,Jiangxi,China;Jiangxi Copper Industry Technology Research Institute Co.,Ltd.,Nanchang 330096,Jiangxi,China)
出处
《中国钼业》
2025年第4期59-63,共5页
China Molybdenum Industry
基金
赣鄱俊才支持计划,主要学科学术和技术带头人培养项目(20243BCE51179)支持。
关键词
钼粉
二氧化钼
一步还原
还原温度
料层厚度
molybdenum powder
molybdenum dioxide
primary reduction
reduction temperature
material layer thickness
