摘要
采用酸浸-煅烧方法对临江某一级硅藻土进行了增白试验研究,探讨了酸浸温度、酸浸时间、硫酸浓度、固液比、煅烧温度、煅烧时间对硅藻土增白效果的影响,并通过扫描电镜及化学成分分析等对增白前后硅藻土进行了表征。结果表明:硅藻土增白适宜工艺条件为:酸浸温度100℃,酸浸时间4 h,固液质量比1∶3.28,酸浓度5 mol/L,煅烧温度650℃,煅烧时间1.5 h;优化工艺条件下,一级硅藻土白度由67.2%提升至88.4%,SiO_2含量由89.78%提升至95.01%,Fe_2O_3含量由1.07%降低至0.21%。
Whitening experiment of Linjiang diatomite was studied by acid leaching and calcination method . The effects of acid leaching temperature, acid leaching time, acid concentration, solid-liquid ratio, calcination temperature, calcination time on the whitening effect of diatomite were discussed. The raw diatomite and purified diatomite were characterized by scanning electron microscopy, chemical element analysis, etc. The results show that the optimum conditions of whitening technology are leaching temperature 100 ℃ , leaching time 4 h, solid-liquid ratio 1 ： 3. 28, acid concentration 5 mol/L, calcination temperature 650 ℃ , calcination time 1.5 h. Through the optimized conditions, the whiteness of diatomite increase from 67. 2% to 88. 4% , SiO2 content increase from 89. 78% to 95. 01% , Fe2O3 content reduced from 1.07% to 0. 21% .
作者
董雄波
刘姝抒
孙志明
张雁鸣
李金辉
郑水林
DONG Xiong-bo LIU Shu-shu SUN Zhi-ming ZHANG Yan-ming LI Jin-hui ZHENG Shui-lin(School of Chemical and Environmental Engineering, China University of Mining and Technology （Beijing） , Beijing 100083, China Linjiang Beifeng Diatomite Limited Company, Linjiang 220681, China)
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第9期2279-2283,共5页
Journal of Synthetic Crystals
基金
国家"十二五"科技支撑计划重点项目(2011BAB03B07)
关键词
硅藻土
酸浸
煅烧
增白
diatomite
acid leaching
calcination
whitening
