The calcined carbide slag was used to prepare xonotlite by replacing quicklime as the
calcareous materials. Effects of calcination temperature on the mineral composition of the carbide slag,
lime activity and synthesized xonotlite were studied. The results indicated that carbide slag after proper
calcination can be used to prepare xonotlite. Calcination temperature has no effect on the synthesized
xonotlite, but has a great impact on lime activity and morphology of secondary particles of xonotlite.
For buliding the mathmatical model of elastic deformation for rolls system with a composite back-up roll assemblled by the shrinkage fit, the roll sleeve and roll mandrel was studied individually, the bending force was acted on the working roll and the load acted on the contact zone was discreted segment by segment, then the deflection model of the working roll and the roll sleeve and roll mandrel was put forward based on the influence function method. According to the force equilibrim function and the deformation compatibility function between the roll sleeve, the roll mandrel and working roll, the solution matrix was listed and the solving programe was compiled to solve the deflection of working roll and composite back-up roll, the pressure between the working roll and the roll sleeve and the cross-section thickness of rolled strip. Therefore, it is an important theoretical foundation to improve the manufacturing technology and practical application of the composite back-up roll.
Iron oxide nanometer powders were prepared by using sol-gel method and the supercritical
fluid drying technology (SCFD) from inorganic salts. The characteristics of the iron oxide nanometer
powders were characterized systematically. The results showed that the drying and crystallization of the
production could be achieved in one step by SCFD method; furthermore, a highly dispersed, size
uniformed and with better crystallization magnetite (Fe3O4) nanoparticles can be obtained. Phase
transformation of the as-synthesized powders occurs at about 80°C, and only hematite (α-Fe2O3) can be
obtained when being heated at temperatures higher than 400°C. The production synthesized by SCFD
exhibits significant magnetic properties. As the heat-treated temperature increase, the magnetic
properties of the sample decrease gradually.
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