Inorganic Chemicals Industry >
Research on synthesis of flaky tobermorite from diatomite and its mechanism
Received date: 2020-08-07
Online published: 2021-01-08
Using diatomatomite as siliceous raw materials,tobermorite with lamellar structure was synthesized by dynamic hydrothermal method.In addition,the influences of the aluminum content in the raw materials and the sodium dodecyl sulfate(SDS) on the morphology of the products were investigated.The results showed that under the conditions of synthesis tempera-ture of 200 ℃,time of 6 h,liquid-solid ratio of 20 mL/g,SDS addition amount of 2.4% and stirring speed of 160 r/min,the tobermorite product with good lamellar structure was prepared. Based on the comparative experiments using pure SiO2 as the silicon source,it was found that aluminum impurities in the diatomite was one of the main factors for the formation of flakye tobermorite.The substitution of aluminum atoms for silicon atoms in bridged tetrahedra prevented the formation of silicon-oxygen tetrahedron double chained and promoted the growth of crystals into plate-like crystal forms.On the other hand,the sodium dodecyl sulfate,as an anionic surfactant,could bond with the H—O on the(001) crystal plane of tobermorite,hinder-ing the growth of crystals on the(001) crystal plane and promoting the growth of flaky crystal form as well.
Key words: diatomite; tobermorite; flaky crystal form; sodium dodecyl sulfate
Ruchun Li , Shuilin Zheng , Zhiming Sun , Chunquan Li . Research on synthesis of flaky tobermorite from diatomite and its mechanism[J]. Inorganic Chemicals Industry, 2021 , 53(1) : 24 -29 . DOI: 10.11962/1006-4990.2020-0102
[1] | Taylor H F W. Crestmoreite and riversideite[J]. Mineral.Mag., 1953,30:155-165. |
[2] | Luke K. Phase studies of pozzolanic stabilized calcium silicate hydra-tes at 180 ℃[J]. Cement and Concrete Research, 2004,34(9):1725-1732. |
[3] | 张美云, 李琳, 宋顺喜, 等. 新型粉煤灰基硅酸钙造纸填料的物化特性[J]. 陕西科技大学学报:自然科学版, 2014,32(6):1-4. |
[4] | Huang Xiang, Jiang Dongliang, Tan Shouhong. Novel hydrothermal synjournal method for tobermorite fibers and investigation on their thermal stability[J]. Materials Research Bulletin, 2002,37(11):1885-1892. |
[5] | 郭晓潞, 宋猛, 鲍梦燕. 不同阴离子对固废基铝掺杂托贝莫来石的影响[J]. 硅酸盐学报, 2018,46(8):1059-1066. |
[6] | 李光辉, 张吉清, 罗骏, 等. 硅酸钠溶液合成托贝莫来石晶须[J]. 硅酸盐学报, 2012,40(12):35-41. |
[7] | Werner D. The Biology of Diatoms[M]. California: University of Ca-lifornia Press, 1977. |
[8] | 郑水林, 孙志明, 胡志波, 等. 中国硅藻土资源及加工利用现状与发展趋势[J]. 地学前缘, 2014,21(5):274-280. |
[9] | Maeda H, Ishida E H. Hydrothermal preparation of diatomaceous earth combined with calcium silicate hydrate gels[J]. J.Hazard.Ma-ter., 2011,185(2/3):858-861. |
[10] | Zhang Y, Jing Z, Li Y, et al. Hydrothermal synjournal of tobermorite from diatomite and its adsorption performance for methylene blue[J]. Materials Research Innovations, 2015,19(S2):63-69. |
[11] | 于怠. 微孔硅酸钙硅质原料硅藻土的研究[J]. 云南建材, 1998,20(2):28-31. |
[12] | Shaw S, Clark S M, Henderso C M. Hydrothermal formation of the calcium silicate hydrates,tobermorite(Ca5Si6O16(OH)2·4H2O) and xonotlite(Ca6Si6O17(OH)2) an in-situ synchrotron study[J]. Che-mical Geology, 2000,167(2):129-140. |
[13] | 王亚洲, 赵青林, 周尚群. 温度对溶液法合成的水化硅酸钙微观结构影响[J]. 硅酸盐通报, 2018,37(9):130-134. |
[14] | Ding Jian, Tang Zhenhua, Ma Shuhua, et al. A novel process for synjournal of tobermorite fiber from high-alumina fly ash[J]. Cem.Concr.Compos., 2016,65:11-18. |
/
〈 |
|
〉 |