高浓度碳分反应制备纳米氢氧化铝的实验研究  

Preparation of alumina trihydroxide by carbonation at high concentration

作　　者：曹亚鹏[1] 郭奋[1] 梁磊[1] 陈建峰[1] 

机构地区：[1]北京化工大学教育部超重力工程研究中心,北京100029

出　　处：《北京化工大学学报（自然科学版）》2006年第6期1-4,共4页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家'863'计划(2002AA302605)

摘　　要：高浓度纳米氢氧化铝(ATH)悬浮液制备的难点是黏度大导致传质困难。碳分纳米ATH悬浮液是黏度极高的时变性非牛顿流体,其黏度随质量分数增加显著增加。用流变的方法筛选出对悬浮液有明显降黏作用的分散剂,其中一种聚电解质和一种阳离子分散剂相配伍可降黏一个数量级以上。在高浓度碳分反应中添加所筛选出的分散剂,成功制得板状形貌,单个的粒度0.2μm×0.05μm(长×厚)且分散性良好的纳米ATH,产率较未添加分散剂的有明显提高。Carbonation precipitation of nano-alumina trihydroxide （ATH） suspensions at high concentrations is problematical because of poor mass-transfer characteristics associated with the high viscosity of the mixtures. The ATH suspension obtained from such carbonation is a very sticky tlme-dependent non-Newtonian fluid and its viscosity increases rapidly with the content of ATH. A rheological method has been used to select dispersants which can decrease the viscosity of the ATH suspension. Addition of a polyelectrolyte plus a cationic surfactant was found to give a decrease of more than one order of magnitude in the viscosity of the suspension. Nano-ATH can thus be prepared from a concentrated precipitation mixture. The resulting ATH has nano-tabulate morphology with size 0.2 μm×0.05 μm （length×thickness） and is well dispersed. Furthermore the yield is also increased.

关 键 词：纳米Al(OH)3 流变 分散剂 

分 类 号：TQ016.1[化学工程]