A two-stage reduction process for the production of high-purity ultrafine Ni particles in a micro-fluidized bed reactor

作     者：Jun Li Xinwei Liu Li Zhou Qingshan Zhu Hongzhong Li 

作者机构：State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of Sciences 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第2期

页      面：27-34页

核心收录：

学科分类：080706[工学-化工过程机械] 081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 

基　　金：the National Special Project for Development of Major Scientific Equipment(2011YQ12003908) the China National Funds for Distinguished Young Scientists(21325628) for their financial support 

主　　题：Ultrafine Ni powder Production Fluidized bed reactor Two-stage reduction 

摘      要：A novel two-stage reduction process for synthesis of ultrafine nickel powder with a high purity and low density in a fluidized bed reactor has been developed in this work. The raw ultraflne NiO particles are first pre-reduced using hydrogen at lower temperatures （340-400 ℃）, followed by further reduction at higher temperatures （500-600℃）. The self-agglomeration of Ni particles formed during low-temperature reduction decreases the sintering activity of the newly formed ultrafine Ni particles, leading to good fluidization quality, even for the subsequent high-temperature reduction process. The agglomerated Ni particles have a high Ni content （above 99wt%）, a low density （0.78g/cm^3） and a uniform particle size （approximately 100 μm）. A concept design for a novel two-stage fluidized bed reactor process used to produce high-purity Ni powder was also proposed. This approach may be extended to the synthesis of other ultrafine/nanosized metals or metal oxides through a fluidization method.