硅酸盐学报

膨润土常压低温焙烧法制备活性白土及其性能

作者：杨梦娜1 2 孙红娟1 2 彭同江1 2 解颜岩1 2

单位：(1. 西南科技大学固体废物资源化教育部重点实验室四川绵阳 621010 2. 西南科技大学矿物材料及应用研究所四川绵阳 621010)

关键词：膨润土低温焙烧法常压浓硫酸活性白土

分类号：TD985

出版年,卷(期):页码：2019,47(4):0-0

DOI：

摘要：

以江西某地钙基膨润土为原料，浓硫酸为活化助剂，常压下低温焙烧活化制备高效活性白土，通过X射线衍射、紫外-可见吸收光谱等分析手段考察了不同浓硫酸/膨润土质量比、焙烧温度及焙烧时间对活化产物物相结构、脱色率及活性度的影响。结果表明：常压低温焙烧法中焙烧温度是影响活性白土性能的首要因素；在优化条件为浓硫酸/膨润土质量比25%、焙烧温度200 ℃，焙烧时间40 min时，制备得到的活性白土脱色率为99.22%，活性度为232 mmol/kg，游离酸含量为0.19%，其他性能也均满足我国行业标准各类型活性白土一等品要求。

Activated clay was prepared via low-temperature calcination at atmospheric pressure with Ca-bentonite as a raw material and sulfuric acid as an activator. The influences of mass ratio of sulfuric acid/bentonite, calcination temperature and calcination time on the phase structure, decolorization rate and activity of the activated products were investigated by X-ray diffraction, ultraviolet-visible adsorption spectroscopy and other analytical methods. The results show that the calcination temperature is a dominant factor affecting the performance of activated clay in this method. An activated clay with the decolorization rate of 99.22%, the activity degree of 232 mmol/kg and the free acid content of 0.19% can be obtained under the optimized conditions (i.e., mass ratio of sulfuric acid/bentonite of 25%, calcination temperature of 200 ℃, and calcination time of 40 min). Besides, this activated clay can be used as a first-class activated clay to meet the industrial requirements.

基金项目：

西南科技大学龙山创新团队支持项目(17LZXT11)；西南科技大学研究生创新基金资助项目(18ycx038)。

作者简介：

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