Preparation and Performance of Polymer Based on Shale Vanadium Extraction Tailings

Abstract

Abstract: In order to use shale vanadium extration tailings (vanadium tailings) as resources, the vanadium tailing was used as the main raw material and the metakaolin was used as an aluminum auxiliary material to prepare geopolymers. The effects of molding method, silicon-aluminum raw material ratio, alkali activator type, alkali activator dosage and molding pressure on the compressive strength of geopolymer samples were investigated. The test results show that the best conditions for the preparation of geopolymers: the quality ratio of raw materials (tailings/metakaolin) is 11:9, the mass fraction of NaOH alkali activator is 10%, the water-solid ratio is 0.18, and the molding pressure is 20 MPa. The compressive strength of the geopolymer after curing for 14 d reaches 58.25 MPa. The geopolymer samples were detected and characterized by XRD, FTIR, TG-DSC, SEM and pore size analysis. The results show that the main products of the geopolymerization reaction are amorphous silica-alumina gel and a small amount of sodium zeolite. Amorphous silica-alumina gel can improve the pore structure of samples and enhance the density of the microstructure of samples, resulting the increase of compressive strength of samples in macroscopic scale.

Key words: shale vanadium extraction tailing, geopolymer, alkali activation, compressive strength, compression moulding, pore structure

CLC Number:

TQ177

XU Xianqing, BAO Shenxu, ZHANG Yimin, LUO Yongpeng. Preparation and Performance of Polymer Based on Shale Vanadium Extraction Tailings[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3668-3676.

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