文献类型：期刊文献

中文题名：低碳醇强化铝酸钾溶液晶种分解过程研究

英文题名：Improvement of seeded precipitation from potassium aluminate solution by lower alcohols

作者：薛金[1,2];刘程琳[1,3];龚珊[1];倪佳莹[1];蔡逸凡[1];辛朝冉[1];于建国[1,2]

机构：[1]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237;[2]华东理工大学化学工程联合国家重点实验室,上海200237;[3]铜仁职业技术学院,贵州铜仁554300

年份：2019

卷号：33

期号：3

起止页码：619

中文期刊名：高校化学工程学报

外文期刊名：Journal of Chemical Engineering of Chinese Universities

收录：CSTPCD;;EI(收录号：20193107254915);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：中央高校基本科研业务探索基金(22A201514058);黔科合基础(2018)1421

语种：中文

中文关键词：种分;铝酸钾;反应强化;氢氧化铝

外文关键词：seeded precipitation;potassium aluminate;reaction improvement;aluminum hydroxide

摘要：铝酸盐溶液的晶种分解工艺是氧化铝生产过程中的关键步骤。针对铝酸钾溶液,考察了 60℃下加入水、乙醇、甲醇以及晶种对铝酸钾溶液分解效率和粒度的影响。结果表明,加入乙醇和甲醇均能强化晶种分解过程。加入水后分解率提高至约 68%,粒度仅为 24.5 μm;加入乙醇后分解率可提高至 63%,但所得的氢氧化铝晶体粒径约为 110 μm,产品呈六棱柱状附聚物;加入甲醇后分解率提高到 81%,粒度约为 90 μm,产品呈片状附聚物。同时晶种的加入可明显提高乙醇过程分解率和反应速率,而对甲醇过程的影响不大;在未加晶种的条件下,甲醇的存在会导致新晶型诺三水铝石的产生。
Seeded precipitation of aluminate solution is an important step in alumina production. Effects of water, ethanol, methanol and seeds on precipitation ratio and product particle size in potassium aluminate solution were investigated. The results show that the precipitation ratio increases to approximately 68% by adding water, and the average particle size is ~ 24.5 μm. The precipitation ratio increases to 63% by adding ethanol, but the average particle size is ~ 110 μm. The product aluminum hydroxide had a form of agglomerates of hexagonal prims. The precipitation ratio was improved to 81% by adding methanol and the average particle size was ~ 90 μm with a form of agglomerates of plate-shaped prims. Meanwhile, the seed can improve precipitation ratio and reaction rate of seeded precipitation with ethanol, but it has no significant effect on seeded precipitation with methanol. Methanol leads to the generation of new crystal form of Nordstrandite without seed.