Effects of Admixtures on the Anti-oxidation Property of MgO/Si_3N_4 Composite Refractory

The effect of the admixtures of Al and Si metals and B4 C and MgAlON compounds on the oxidation of MgO/ Si3N4 composite refractory has been studied, which is a promising carbon free refractory for steel-making application . The four kinds of admixtures can be used as anti-oxi-dants for Si3N4, but the mixture of Al and Si achieved the best result. The mixture can not only play the role as anti-oxidant, but also assist the sintering process and help form dense sintering layer, improving the property of the composite.

钒钛铁尾矿综合利用概述

承德毗邻京津,通达辽蒙,资源富集,是矿业大市,多年的矿业开发在有力的支撑了全市经济和社会发展的同时,也形成了大量的尾矿。钒钛铁尾矿作为承德地区典型工业固废,通过对其产排情况及综合利用情况分析,对尾矿综合开发利用探索和实践和首都生态环境及水资源安全提供了良好的参考,同时对推进承德市工业资源综合利用,打造京津冀水源涵养功能区,以及促进经济调结构、转方式的可持续发展模式具有重要意义。