Preparation and Pb2+ Immobilization Behaviors of Blast Furnace Slag Based Geopolymer

Geoscience ›› 2008, Vol. 22 ›› Issue (5): 852-856.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Preparation and Pb²⁺ Immobilization Behaviors of Blast Furnace Slag Based Geopolymer

1Key Laboratory of Multiphase Reactions, Institute of Process Engineering, Chinese Academy of Sciences, Beijing100080, China; 2Graduate University of Chinese Academy of Sciences, Beijing100080, China;
3Research Department Institute,Beijing Hengju Oilfield Chemical Agent Co.,Ltd.,Beijing101109, China

Received:2008-04-03 Revised:2008-08-10 Online:2008-10-20 Published:2009-11-12

Abstract

Abstract:

Geopolymer, with good mechanical properties, was prepared using blast furnace slag(BFS) and calcinated kaolin clay. The synthesis tests of slag based geopolymer are done based on four different slag contents (20%, 40%, 60%, 80%),curing regime( 20 ℃) and curing time(1 d,3 d,7 d,28 d)The testing results showed that the geopolymer mortar containing 80% slag exhibited the highest mechanical strength in 28 d curing. The compressive strength of slag based geopolymer mortar is 65 MPa. Additionally, infrared(IR), Xray diffraction(XRD) techniques are used to characterize the microstructure of the slag based geopolymer paste. The analytical data indicated that significant depolymerization of the silicate or aluminosilicate networks occurred, then significant polymerization occurred. Immobilization behaviors of slag based geopolymer in presence of Pb²⁺also is carried out. The geopolymer was prepared by using Pb²⁺ solution,and the compressive strengths were tested in 28 d curing. The Pb²⁺ content had influenced on the development of compressive strength of geopolymer, but the compressive strength in 28 d did not change observably. The leaching tests were employed to investigate the immobilization behaviors of the slag based geopolymer. The leaching tests showed that the slag based geopolymer can effectively immobilize Pb²⁺content, and the immobilization rate reached 99.9%.

Key words: geopolymer, blast furnace slag, immobilization, Pb²⁺

CLC Number:

P579
TQ170.4

NI Jian-Di CHEN Wen-Yan XIE Shu-Feng CHEN Yun-Fa. Preparation and Pb²⁺ Immobilization Behaviors of Blast Furnace Slag Based Geopolymer[J]. Geoscience, 2008, 22(5): 852-856.

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Preparation and Pb²⁺ Immobilization Behaviors of Blast Furnace Slag Based Geopolymer

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