Geopolymer taking stone coal vanadium extracted tailings as major raw materials and preparation method thereof

Abstract

The invention relates to a geopolymer taking stone coal vanadium extracted tailings as major raw materials and a preparation method thereof. According to the technical scheme, the geopolymer is prepared from the following components in percentage by weight: 57-78 percent of stone coal vanadium extracted tailings, 5.5-10 percent of silicon-aluminum corrective addition, 10-18 percent of solid base excitant, 1-3.5 percent of water-proofing agent, 2-10 percent of stuffing and 2-10 percent of deionized water. The preparation method comprises the following steps of: adding a base excitant solution prepared by dissolving the solid base excitant in the deionized water into a mixture prepared from the stone coal vanadium extracted tailings and the silicon-aluminum corrective addition, and stirring; adding the water-proofing agent and stuffing, and stirring; and performing press forming, coating a molded blank with a plastic film, curing, demolding and standing at room temperature. The preparation method has a simple process, low cost and low energy consumption; and the geopolymer has high compression strength, high dry-shrinkage resistance and high impermeability, and is prevented from scumming after standing for a long time.

Description

technical field [0001] The invention belongs to the technical field of geopolymers, and in particular relates to a geopolymer whose main raw material is vanadium extraction tailings from stone coal and a preparation method thereof. Background technique [0002] French material scientist Joseph Davidovits initially used kaolinite and calcined kaolinite as raw materials for the preparation of geopolymer materials, and first proposed the term Geopolymer in 1978, which originally meant geochemical or artificial Aluminosilicate mineral polymer produced by imitating geosynthesis. It has a link structure similar to organic polymers, and has the characteristics of organic polymers, ceramics, and cement, but it is different from the above materials. It is characterized by high strength, rapid curing, high temperature resistance, heat insulation, acid resistance Erosion, adsorption of harmful poisons, etc. [0003] In research at home and abroad, metakaolin or fly ash are generally ...

AI Technical Summary

Problems solved by technology

In the traditional preparation process, the silicon-aluminum raw materials are generally directly reacted with the activator without activation pretreatment (Wang Dongmin, Chen Liangcheng. Fly ash-based mineral polymer cement production method and prepared materials [P].CN 200510077649.4, 2006 ), so that the active Al contained in the amorphous component in the silicon-aluminum raw material 2 o 3 and active SiO 2 Can not be fully leached, the active potential of the raw material has not been fully utilized, and the strength of the generated geopolymer cannot be fundamentally improved

[0004] The traditional preparation process adopts the method of vibration molding, and on the basis of ensuring good working performance of the slurry, a certain amount of water needs to be added (Z.Zuhua, Y Xiao, Z.Huajun, et al.Role of water in the synthesis of calculated kaolin-based geopolymer [J] Applied Clay Science, 2009, 43: 218~213; P.Chindaprasirt, T. Chareerat, VSirivatnanon. Workability and strength of coarse high calcium fly ash geopolymer [J] Cement & Concrete Composites, 2007, 29: 224~229), However, as the amount of water added increases, the shrinkage resistance and impermeability of the geopolymer will decrease; in most studies on geopolymers or other building materials, the effect of crystalline substances in the system on water will appear. After passing through the pores and reaching the surface of the reaction product, a pan-frost phenomenon is formed (S Xiujiang. Development and Performance of Class F Fly Ash Based Geopolymer Concretes against Sulphuric Acid Attack[D].Sydney: The University of New South Wales, 2007; Ana Andres, Ma Carmen Diaz , Alberto Coz, et al.Physico-chemical characterization of bricks all through the manufacture process in relation toefforescence salts[J]Journal of the European Ceramic Society, 2009, 29:1869~1877), and then peel off and fall off, which affects the test The appearance of the test piece also has a negative impact on the strength of the test piece

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