Effect of calcium hydroxide concentration and stirring rate on the crystallization of the calcium carbonate on the surface of fly ash

被引：0

作者：

Fan H. ^{[1
]}

Song H. ^{[1
]}

Rao Y. ^{[1
]}

Wang X. ^{[1
]}

Zhu G. ^{[1
]}

Wang Q. ^{[1
]}

Qi Y. ^{[1
]}

Zhu G. ^{[1
]}

Gao D. ^{[1
]}

Liu J. ^{[1
]}

机构：

[1] State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou

来源：

BioResources | 2019年 / 13卷 / 03期

关键词：

Calcium carbonate; Fly ash; Heterogeneous nucleation; LaMer model;

D O I：

10.15376/biores.13.3.7017-7025

中图分类号：

学科分类号：

摘要：

To improve the whiteness of fly ash, fly ash was prepared using calcium hydroxide, water, and carbon dioxide as the reaction system to coat calcium carbonate crystals on the surface of the fly ash. This study investigated the effect of the calcium hydroxide content and stirring rate on the crystallization of the calcium carbonate on the fly ash surface. The results showed that the calcium carbonate nanoparticles prepared with a 7% calcium hydroxide concentration and stirring rate of 500 rpm were coated on the surface of the fly ash, and the whiteness of the modified fly ash reached a maximum of 59.7% ISO. The microscopic process of heterogeneous nucleation of calcium carbonate and the LaMer model were explored to explain the influence of the precursor reactant concentration and stirring rate on the nucleation and growth of the crystal. © 2018, BioResources.

引用

页码：7017 / 7025

页数：8

共 12 条

[1]

Cacciuto A., Auer S., Frenkel D., Onset of heterogeneous crystal nucleation in colloidal suspensions, Nature, 428, pp. 404-406, (2004)

[2]

Deng Z., Zhu H., Peng B., Chen H., Sun Y., Gang X., Jin P., Wang J., Synthesis of PS/Ag nanocomposite spheres with catalytic and antibacterial activities, ACS Appl. Mater. Inter, 4, 10, pp. 5625-5632, (2012)

[3]

Crystallization, (1997)

[4]

Fan S.M., Yang Y.F., Gai G.S., Miao H.Z., Effect of processing parameters on the reparation of composite GCC with nano-structure surface, Rare Metal Mat. Eng, 32, pp. 801-804, (2003)

[5]

Fan S., Surface Modification of Mineral Powder Nano-technology Research and Application, (2004)

[6]

'Inorganic chemicals for industrial use-General method for the determination of whiteness', (2009)

[7]

Hemalatha T., Ramaswamy A., A review on fly ash characteristics-Towards promoting high volume utilization in developing sustainable concrete, J. Clean. Prod, 147, pp. 546-559, (2017)

[8]

LaMer V.K., Dinegar R.H., Theory, production and mechanism of formation of monodispersed hydrosols, J. Am. Chem. Soc, 72, 11, pp. 4847-4854, (1950)

[9]

LaMer V.K., Nucleation in phase transitions, Ind. Eng. Chem, 44, 6, pp. 1270-1277, (1952)

[10]

Wang X., Microscopic model of crystal nucleation and growth, J. Weifang Eng. Vocational College, 20, 3, pp. 15-17, (2007)

← 1 2 →