低品位煤矸石制备多孔莫来石研究  

Preparation of porous mullite from low grade coal gangue

作　　者：宋绍雷[1,2] 甄强[1,2] 王方方[2] 王亚丽[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海大学纳米科学与技术研究中心,上海200444

出　　处：《耐火材料》2014年第1期18-21,共4页Refractories

基　　金：国家自然科学基金资助项目(51272154;51072112);攀枝花市产业化科技推进行动项目(2012CY-S-18)

摘　　要：为了综合利用低品位煤矸石，首先对其原矿进行低温（400℃以下）煅烧和酸洗除杂的预处理，然后以预处理后的煤矸石为主要原料，适量添加氧化铝使n（Al2O3）：n（SiO2）=1：1，以平均粒径5．6～6．2μm的交联丙烯酸树脂做造孔剂，PVA溶液为结合剂，经反应烧结制备多孔莫来石，并研究了造孔剂添加量对多孔莫来石显微结构和性能的影响。结果表明：以低品位煤矸石为主要原料，经过低温煅烧和酸处理后，适量添加氧化铝和造孔剂．经1600℃2h反应烧结可一步制备出主晶相为莫来石的多孔莫来石；随着造孔剂添加量的增加，多孔莫来石的显气孔率和线收缩率明显增大，体积密度、热导率和耐压强度显著降低，但其质量分数增加到30％后．这些性能的变化趋于平稳。Natural low grade coal gangue was calcined below 400℃ and pickled to remove impurities for its comprehensive utilization. Porous mullite was prepared by reaction sintering using the pretreated coal gangue as main starting material,adding alumina to make n（Al2O3 ）： n（SiO2） = 1 ：1 ,crosslinking acrylic resin with average size of 5.6-6.2 μm as pore-forming agent,and PVA solution as binder. Effect of pore-forming agent addition on microstructure and properties of porous mullite was researched. The results show that：por- ous mullite with main crystal phase of mullite can be prepared by using low grade coal gangue after low temperature calcining and pickling,adding alumina and pore-forming agent,and reaction sintering at 1600℃ for 2 h;with the increased pore-forming agent addition,the apparent porosity and shrinkage in dimensions increase, bulk density, thermal conductivity and compressive strength decrease obviously, however, when pore-forming agent addition increases to 30 mass%, the change of properties tends to be stable.

关 键 词：低品位煤矸石 多孔莫来石 气孔率 热导率 

分 类 号：TQ174[化学工程—陶瓷工业]