添加CaCO3对煤灰熔融性影响及其机理的研究
Journal Title: Science Paper Online - Year 2008, Vol 3, Issue 9
Abstract
考察了CaCO3不同添加量对三种低灰熔点煤样的软化温度(ST)的影响，揭示了CaCO3对煤灰熔融性的影响规律。同时结合X射线衍射技术及CaO—Al2O3—SiO2 三元相图探讨了加入CaCO3后的煤灰熔融机理。结果表明，煤灰熔点随CaCO3加入量的提高先降后升，当煤灰CaO 超过一定含量后可起到提高灰熔点的阻熔剂作用。机理表明氧化钙在加热过程中与其他成分会生成多种高含钙化合物，各物质之间会形成低温共熔化合物，造成灰熔点降低，当钙含量过高时，由于过剩氧化钙的存在，灰熔点上升。
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