铝盐改性膨润土对竹浆绿液中硅酸盐的吸附动力学研究  

Kinetics of adsorption of silicate in bamboo pulp green liquor by aluminum salts modified bentonite

作　　者：林涛[1] 付玥[1] 徐永建[1,2,3] 张鼎军 朱振峰[2] 

机构地区：[1]陕西科技大学轻工与能源学院陕西省造纸技术及特种纸品开发重点实验室,陕西西安710021 [2]陕西科技大学材料科学与工程博士后流动站,陕西西安710021 [3]贵州赤天化集团有限责任公司,贵州赤水564700

出　　处：《陕西科技大学学报（自然科学版）》2015年第5期1-7,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家十二五科技支撑计划项目(2012BAD23B0201);国家自然科学基金项目(20876092);陕西科技大学学科带头人培育计划项目(20876092)

摘　　要：以钠基膨润土作为原料,通过添加铝盐为改性剂制得了一种新型高效绿液除硅剂——铝盐改性膨润土(ALMB),并全面研究了ALMB对绿液中硅酸盐的吸附动力学行为.结果表明,ALMB可以有效地吸附硅酸盐,在10min内即可完成除硅反应,且对绿液pH、总碱量等的影响较小,其最佳ALMB用量为20g/L,此时的除硅率可达79.3%.通过ALMB对绿液(硅含量分别为1g/L、2g/L、3g/L、4g/L)的吸附动力学研究,可知其吸附过程符合二级动力学模型,是物理吸附和化学吸附的共同作用.在2g/L硅浓度下的动力学模型中,其相关参数最大(R2=0.999 78),可得出最大吸附量为101.833 0 mg/g,与实验室中得出的最大吸附量100.583 3mg/g相符.A variety of novel and efficient silicate‐aluminum salts modified bentonite（ALMB） removal agent was prepared by adding the modifier of aluminum salts as the Na‐bentonite used as the raw material .And the kinetics of adsorption of silicate in green liquor by ALMB was studied .The results indicate that the ALMB can adsorb silicate effectively .The desilica‐tion reaction could be accomplished in 10 min ,and had a little effect on the green liquor pH and total alkali content .The optimum ALMB dosage was 20 g/L ,and the desilication rate could exceed 79 .3% .Study on the adsorption kinetics of green liquid （1 g/L ,2 g/L ,3 g/L ,4 g/L） by ALMB ,the kinetic mode of silicate adsorption were indicated that the whole adsorp‐tion process was suitable to the pseudo‐second‐order kinetic model embracing physical and chemical adsorption .The parameters of the kinetic model of 2 g/L silicate concentration were the largest （R2 =0 .999 78） ,the maximum adsorption capacity was 101 .833 0 mg/g coinci‐ding with the experimental adsorption capacity of 100 .583 3 mg/g .

关 键 词：竹浆绿液 铝盐改性膨润土 除硅 吸附动力学 

分 类 号：P619.255[天文地球—矿床学]