Nikitin S. Porous glass-crystalline materials based on natural and recycled row materials

PhD Thesis., specialty 05.17.11 - refractory nonmetallic materials technology. State Higher Education Institution "Ukrainian State University of Chemical Technology", Dnipropetrovsk, 2014. The thesis is devoted to the development of technology of obtaining of new porous glass-crystalline materials based on non-deficient natural and technogenic materials with high performance mechanical strength. Regularities quantitative relationship between the charge composition, firing mode and physic-mechanical properties of porous glass-crystalline materials using gas-forming additive complex action experimentally have been established. It is shown that when used as a gas-forming additives loam, breakage of asbestos-cement products and open-hearth slag to produce porous materials with high physical and mechanical characteristics (compressive strength of 2,5-5,16 MPa, density of 218-350 kg/m3, thermal conductivity 0,05-0,068 W/m·deg, water absorption 5,12 %), firing temperature should be at 750 °C, in the case of blast furnace slag and fly ash are introduced - 850 °C. The model of viscos-elastic fracture of porous glass-crystalline materials under load is proposed. It is established that prototypes after reaching the maximum load is not destroyed completely brittle and can withstand pressure 1.5-2.5 MPa even after paying 30 % of deformation. Developed energy and resource saving technology of cleaner production of porous glass-crystalline materials in three forms of production (blocks or shell, pellets and crushed stone) with one part by weight based on recycled materials. The estimated technical and economic performance of porous glass-crystalline materials in blocks and granules are calculated.