Corrosion of burning urban domestic wastes to alkali-resistant bricks and spalling-resistant high alumina bricks was researched by static crucible method and SEM in order to choose refractories for cement rotary kilns...Corrosion of burning urban domestic wastes to alkali-resistant bricks and spalling-resistant high alumina bricks was researched by static crucible method and SEM in order to choose refractories for cement rotary kilns for collaboratively disposing wastes. The result indicates that the main corrosion mechanism is slag permeation and corrosion ; the emitted high temperature gases containing alkali, sulfur and chlorine during burning the wastes re- act with refractories forming low melting point sulfate, chloride and compound salts, which metamorphose the refractories, and the loose metamorphic layer is easy to spall under thermal stress. So, corrosion resistance and spaUing resistance shall be taken into account when choosing refractories for cement rotary kilns for collaboratively disposing wastes. It is suggested that decomposition furnaces should adopt spaUing resistant high alumina bricks and anti-coating SiC castables, and preheating equipment should adopt high strength alkali-resistant bricks and castables.展开更多
High purity forsterite was prepared with magnesite tailings and quartz pounder as starting materials. The influence of the preparution process on the physical properties of the synthetic forsterite was studied. The ph...High purity forsterite was prepared with magnesite tailings and quartz pounder as starting materials. The influence of the preparution process on the physical properties of the synthetic forsterite was studied. The ph,se composition and the microstructure of the synthetic forsterite were analyzed by means of XRD and SEM. The results ,show thal the composites with 63% MgO fired at 1 670℃ exhibit the highest compact structure.展开更多
文摘Corrosion of burning urban domestic wastes to alkali-resistant bricks and spalling-resistant high alumina bricks was researched by static crucible method and SEM in order to choose refractories for cement rotary kilns for collaboratively disposing wastes. The result indicates that the main corrosion mechanism is slag permeation and corrosion ; the emitted high temperature gases containing alkali, sulfur and chlorine during burning the wastes re- act with refractories forming low melting point sulfate, chloride and compound salts, which metamorphose the refractories, and the loose metamorphic layer is easy to spall under thermal stress. So, corrosion resistance and spaUing resistance shall be taken into account when choosing refractories for cement rotary kilns for collaboratively disposing wastes. It is suggested that decomposition furnaces should adopt spaUing resistant high alumina bricks and anti-coating SiC castables, and preheating equipment should adopt high strength alkali-resistant bricks and castables.
基金Zhengzhou Municipal Science and Technology Special Fund Project(No.153PZDZX043)
文摘High purity forsterite was prepared with magnesite tailings and quartz pounder as starting materials. The influence of the preparution process on the physical properties of the synthetic forsterite was studied. The ph,se composition and the microstructure of the synthetic forsterite were analyzed by means of XRD and SEM. The results ,show thal the composites with 63% MgO fired at 1 670℃ exhibit the highest compact structure.
