摘要
以含稀土的石膏为原料运用常压酸化法合成硫酸钙晶须,探讨了不同工艺条件对生成的硫酸钙晶须形貌的影响,同时还考察了晶型助长剂的种类和晶型助长剂的含量对硫酸钙晶须生长的影响,利用SEM和XRD分别对硫酸钙晶须的表面形貌、物相特征做了表征分析。实验得到制备硫酸钙晶须的最佳的反应条件:稀土石膏质量浓度为0.22 g/mL、反应时间为25 min、盐酸浓度为2.8 mol/L、反应温度为70℃、陈化时间为4 h,在此条件下合成的硫酸钙晶须平均长度为61μm,平均长径比为30.5;通过对比实验选出了CuCl2作为促进硫酸钙晶须生长的助长剂,在添加5%(质量分数)的CuCl2的情况下可使硫酸钙晶须长径比从30.5增至41,长度从61μm增至81μm。
Calcium sulfate whiskers were synthesized by atmospheric pressure acidification using rare earth-containing gypsum as raw material.The effects of different process conditions on the morphology of the formed calcium sulfate whiskers were investigated.At the same time,the effects of the type of crystal growth promoter and the content of crystal growth promoter on the growth of calcium sulfate whiskers were also investigated.The surface morphology and phase characteristics of calcium sulfate whiskers were characterized by SEM and XRD,respectively.The experimental results showed that the optimal reaction conditions for preparing calcium sulfate whiskers were rare earth gypsum mass concentration of 0.22 g/mL,reaction time of25 min,hydrochloric acid concentration of 2.8 mol/L,reaction temperature of 70℃and aging time of 4 h.The average length of the calcium sulfate whiskers synthesized under these conditions was 61μm,and the average aspect ratio was 30.5.CuCl2 was selected as a growth promoter for promoting the growth of calcium sulfate whiskers by contrast experiments.With the addition of 5%(mass fraction)CuCl2,the aspect ratio of calcium sulfate whisker was increased from 30.5 to 41,and the length was increased from 61μm to 81μm.
作者
徐伟
李梅
张栋梁
高凯
李健飞
Xu Wei;Li Mei;Zhang Dongliang;Gao Kai;Li Jianfei(School of Chemistry and Chemical Engineering,Inner Mongolia University of Science and Technology,Inner Mongolia,Baotou 014010,China;Key Laboratory of Green Extraction and Efficient Utilization of Light Rare-Earth Resources,Ministry of Education)
出处
《无机盐工业》
CAS
CSCD
北大核心
2020年第8期66-71,共6页
Inorganic Chemicals Industry
基金
典型轻稀土及伴生资源高效清洁提取关键技术基础研究,国家自然科学基金重点项目(51634005)。
关键词
稀土石膏
常压酸化法
硫酸钙晶须
晶型助长剂
rare earth gypsum
atmospheric pressure acidification
calcium sulfate whisker
crystal growth promoter
