The role of polyaluminum chloride in kaolinite aggregation in the sequent coagulation and flocculation process

Long Liang; Jiakun Tan; Yaoli Peng; Wencheng Xia; Guangyuan Xie

doi:10.1016/j.jcis.2016.01.039

The role of polyaluminum chloride in kaolinite aggregation in the sequent coagulation and flocculation process

J Colloid Interface Sci. 2016 Apr 15:468:57-61. doi: 10.1016/j.jcis.2016.01.039. Epub 2016 Jan 21.

Authors

Long Liang¹, Jiakun Tan¹, Yaoli Peng², Wencheng Xia², Guangyuan Xie³

Affiliations

¹ School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
² School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China; National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China.
³ School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China; National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China. Electronic address: xieguangyuan1962@sina.com.

PMID: 26828274
DOI: 10.1016/j.jcis.2016.01.039

Abstract

The role of polyaluminum chloride (PAC) in kaolinite aggregation is studied in this paper by the aggregation of kaolinite with the single and combined use of PAC and polyethylene oxide (PEO). The sequent coagulation and flocculation pattern with the combined use of PAC and PEO shows higher aggregation efficiency than that with the single use of PAC or PEO. In the sequent coagulation and flocculation pattern, the settling velocity and the Zeta potential of kaolinite steadily increase with the PAC concentration, which indicates that the role of PAC is to render the interaction between kaolinite and PEO rather than charge neutralization. This conclusion is supported by the X-ray photoelectron spectroscopy analysis, which shows steady increase of Al-OH group on kaolinite with the PAC concentration.

Keywords: Aggregation; Coagulant; Kaolinite; Polyaluminum chloride; Polyethylene oxide.

Publication types

Research Support, Non-U.S. Gov't