WO2.72流态化预还原过程调控  

Regulation process of WO_(2.72) fluidization pre-reduction

作　　者：刘家义 潘锋[2] 祝京旭[1,3] Liu Jiayi;Pan Feng;Zhu Jess(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Dept.of Chemical and Biochemical Engineering,Western University,London Ontario N6A 5B9,Canada)

机构地区：[1]天津大学化工学院,天津300072 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]加拿大西安大略大学化学与生物化工系,加拿大安大略省伦敦市N6A 5B9

出　　处：《石油化工》2021年第10期1019-1025,共7页Petrochemical Technology

基　　金：国家自然科学基金项目(21878305,22078326)。

摘　　要：在流化床反应器上,采用CO和CO_(2)混合气模拟深还原尾气对工业紫钨(WO2.72)进行预还原,建立了还原过程中还原率的定量分析方法,考察了反应温度、CO分压和反应时间对WO2.72预还原过程的影响。实验结果表明,建立的还原氧化物标准曲线具有良好的线性;反应体系中CO分压对反应影响显著,CO_(2)对还原过程有明显的抑制作用;反应温度与还原率呈正相关,在CO/(CO+CO_(2))体积比为0.8、950℃下反应1h,WO2.72的还原率可达93.8%;所获得的预还原产物主要是粒径约为150nm的WO2(低氧指数钨氧化物)粉体。通过建立WO2.72预还原过程调控机制,可为WO2.72或WO3等高氧指数钨氧化物进行预还原-深还原碳化制备超细碳化钨粉体奠定理论基础。Industrial violet tungsten(WO2.72)was pre-reduced in a fluidized bed reactor by using CO and CO_(2) mixture to simulate deep reduction tail gas.The quantitative analysis method of reduction rate in the reduction process was established,and the effects of reaction temperature,partial pressure of CO and reaction time on the pre-reduction process of WO2.72 were investigated.The results showed that the standard curve of reduced oxide had good linearity.The partial pressure of CO had a significant effect on the reaction,and the presence of CO_(2) had obvious inhibitory effect on the reduction process.The reaction temperature was also positively correlated with the reduction rate.Under the condition of volume ratio of CO to CO_(2) of 0.8,reaction temperature of 950℃,reaction time of 1 h,the reduction rate of WO2.72 reached 93.8%.The pre-reduction product was mainly WO2(low oxygen index tungsten oxide)powder with a particle size of about 150 nm.By establishing the regulation mechanism of WO2.72 pre-reduction process,it lays a theoretical foundation for the preparation of ultrafine tungsten carbide powder by pre-reduction&deep reduction carbonization of high oxygen index tungsten oxides such as WO2.72 or WO3.

关 键 词：紫钨 流化床 预还原 过程调控 

分 类 号：TQ136.1[化学工程—无机化工]