Zn粉在水溶液中球磨的生成相演化规律研究  

Investigation on Rule of Phase Transformation of Products of Ball Milling of Zinc in Water Solution

作　　者：陈更莉[1] 郝亮[1] 陈刚[1] 陈鼎[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《矿冶工程》2007年第6期61-63,68,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(50574039)资助项目

摘　　要：将纯度为99.9%的Zn粉在水溶液中进行高能球磨,调节溶pH值,制取Zn(OH)2和ZnO纳米粉末。不同球磨时间间隔进行取样,样品经低温烘干,由XRD与SEM进行相成分分析及粉末形貌的分析。结果表明,酸性条件(pH=3)时球磨90 h,得到几乎全部Zn(OH)2;中性条件pH=7时,得到大部分ZnO和少部分Zn(OH)2,碱性条件pH=11时,得到大部分Zn(OH)2和部分ZnO,所有产物皆为纳米粉末。经热力学和动力学分析,初步得出碱性环境促进了Zn与水的反应,加速了Zn(OH)2的生成;球磨一定时间后中性环境下大部分Zn(OH)2会向ZnO转变,达到一定球磨时间后逐渐保持平衡。Zinc powder with purity of 99.9% was used to prepare Zn(OH)2 and ZnO nanopowder by grinding it in water solution in a high-energy ball-mill with adjustment of the solution pH value.The samples sampled at different intervals during milling were baked.XRD and SEM were adopted to analyze the compositions and patterns of the samples.The results indicated that almost all Zn(OH)2 was obtained under the conditions of milling for 90 hrs in acid solution(pH=3);most of ZnO and a small part of Zn(OH)2,at pH=7;most of Zn(OH)2 and a small part of ZnO,at pH=11.All the products are nanoscale powders.The thermodynamic and dynamic analyses displayed that the alkaline solution accelerated the reaction of Zn with H2O and the formation of ZnO while most of Zn(OH)2 tended to transform to ZnO in neutral solution after a certain time of milling and gradually keep balance when the milling time reached to a certain length.

关 键 词：纳米粉末 Zn(OH)2 ZNO 固液反应 球磨 PH值 相转变 

分 类 号：TB34[一般工业技术—材料科学与工程]