Study On The Performance Of Geopolymers Prepared From Coal Measures And Solidification/Stablization Of Heavy Metals

Stabilization/solidification (referred to as S/S) technique is one of the most important and cost-effective method for wastes disposal that containing heavy metals. Immobilization material of traditional cement stabilization/solidification technology used is mainly ordinary Portland cement, it seems monotonous, and the durability is low, and also has poor corrosion resistance. The new type of stabilization/solidification systems-geopolymer material using fly ash, kaolin, industrial wastes that containing aluminosilicate materials as its main raw material begin to reveal strengths in nuclear waste disposal, and also attract the world’s attention due to its excellent performance of high strength, good acid resistance, strongly impermeability. It becomes to a new initiatives to handling with the environment pollution and the energy shortages.The study on geopolymer stabilization/solidification technique to deal with heavy metal ions mainly concentrate on the preparation of the geopolymer and its performance testing. And its row material is mainly fly ash and kaolin. Research objective is incorporation of a single heavy metal ions. A litter research has been done in a variety of different heavy metals alone or mutual doped in selective solidify. This thesis broaden the selection scope of raw materials for geopolymer preparing. The industrial wastes of fly ash, gangue and silica fume was widely used. And also mixed with ordinary Portland cement to prepare a new type of polymer with high performance. To obtain excellent mechanical properties of the matrix formulation by a orthogonal design. On this basis, have studied on the selective solidify of a variety of heavy metal ions(Co2+, Cr3+, Zn2+, Ni2+). So it provide technical support and reference for stabilization/solidification effects of polymer with multi-ion co-doped. Microscopic properties of solidified polymer and solidified cement was investigated by using X-ray diffraction analyzer(XRD), Fourier transform infrared spectroscopy(FI-IR), Scanning electron microscopy(SEM). A preliminary study has been done from the perspective of physical chemistry on stabilization/solidification mechanisms of polymer.