摘要:
先以布袋灰、电炉灰、焦粉、水泥制成冷固结球团, 进行高温自还原试验。再以纯水泥试样进行差热试验。最后以纯试剂四氧化三铁和石墨粉, 配加纯氧化铝粉末并且不添加粘结剂制成的冷固结球团进行自还原试验。通过检测其抗压强度、扫描电子显微镜-能谱分析等方法分析了粉尘冷固结球团高温复合粘接机理, 研究表明:低温下粉尘冷固结球团的强度主要靠水泥粘结相保证, 随着温度升高, 水泥逐渐失效, 在1 000℃后金属铁连晶开始生成, 并成为主要粘结相, 未熔固态成渣物质对金属铁连晶的形成具有负面的影响, 当其含量超过15%时就会对金属体连晶的形成产生显著的影响。
关键词:
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粉尘 /
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冷固结球团 /
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复合粘结 /
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强度 /
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温度
Abstract:
The cold consolidation pellets were made by bag ash,electric furnace ash,coke powder and cement,and the high temperature self-reduction experiment was carried out on the pellet.Pure cement samples had been used for differential thermal experiments.Finally,the self-reduction experiment was carried out on the cold consolidation pellet made of pure solid iron oxide,graphite powder and pure alumina powder without adding binder.The mechanism of high temperature composite bonding of dust and cold consolidation pellets was analyzed by detecting the compressive strength,scanning electron microscopy and energy spectrum analysis.The results show that the strength of the cold consolidation pellets at low temperature is mainly determined by the cement.With the temperature increasing,the cement gradually failed,after 1000 ℃ in the metal iron began form,and become the main binder phase. Unmelted slag material has a negative impact on the formation of metal iron crystal,when its content excessing 15% it will have a significant impact on the formation of crystal.
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