撞击流管式反应制备超细氧化锆粉体

我国氧化锆粉体产业目前基本上“精进粗出”，迫切需要开发氧化锆粉体备新工艺，特别是具有高附加值的纳米氧化锆粉体制备技术，液相反应沉淀法具有成本低，易于工业化等优点而成为研究的热点。本文采用撞击流管式反应新工艺，撞击流接触反应强化了过程的微观混合。实现了均匀成核，使得成核过程易于控制，而管式反应器的独特设计克服了返混，因而使得反应沉淀过程易于控制，粒子分布窄。用该工艺结合醇热处理表面改性制备的超细氧化锆粉体。平均粒径约为14nm，粒度分布窄并无硬团聚发生。该方法过程简单，易于工业化大生产。

Preparation of Ultrafine Powder of ZrO2 with Impinging-Tubular Reactor

Zirconia industry in our country is under developing. During the past decades, a great number of low end ZrO 2 powder were exported, but on the contrary, many high grade ZrO 2 powder were imported simultaneously. For that cause, new technology to prepare ZrO 2 powder with high extra economic value, especially ZrO 2 nano-powder with controlled particle size and its distribution, is needed to develop urgently. Method of reaction precipitation is becoming the focus of the study because of its low cost and easy industrialization. In this paper, a new technology of tubular reaction with impinging inlet was investigated. Reaction precipitation occurred when reactants contacted each other by impinging, through which micromixing was greatly intensified to ensure a homogeneous environment. In this case, the nucleation can be controlled effectively. Moreover, tubular reactor provided a homogeneous environment for growth of nuclei because back mixing was avoided as possible. So, both nucleation and growth progress can be controlled. Combination with surface modification via alcohol-thermal treating, final ZrO 2 nano powder with 14 nm of mean particle size and very narrow size distribution and no agglomeration is achieved. All the processes are operated easily, and have a good prospect of industrialization.