Preparation of porous cordierite from coal gangue and abandoned refractory materials
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摘要: 以煤矸石、用后滑板磚和用后鎂碳磚為原料,采用石墨、淀粉和復合添加劑為造孔劑,制備出多孔堇青石材料,并研究造孔劑種類、造孔劑加入量和合成溫度對材料合成和材料性能的影響.實驗結果表明:采用煤矸石和用后耐火材料為原料,在1350～1400℃高溫下可以合成高純度的堇青石材料;復合添加劑為最佳造孔劑,其合適加入量為15%～25%;當復合添加劑加入量為20%,在1350℃保溫3h條件下,合成材料的氣孔分布均勻貫通,其顯氣孔率為44.9%,熱膨脹系數為2.14×10-6 K-1,荷重軟化點為1290℃,綜合性能良好,具有優良的高溫使用性能.Abstract: Porous cordierite ceramics were synthesized from coal gangue,wasted slide gates and wasted magnesia carbon bricks with graphite,starch and compound additives as pore-forming materials.The relationships between properties and synthesis conditions,such as the type and addition of pore-forming materials and heating temperature,were investigated.The result showed that high-purity porous cordierite was synthesized from coal gangue and used refractories at 1 350 to 1 400 ℃ while the compound additives was used as pore-forming materials and their addition is 15% to 25%.At the addition of the compound additives of 20%,1 350 ℃ and sintering for 3 h,porous cordierite ceramics with homogeneous pores distribution were obtained,their apparent porosity is 44.9%,thermal expansion coefficient is 2.14×10-6 K-1,and softening point load is 1 290 ℃.Because of these good comprehensive performances,all bricks can meet the demands of service at high temperature.
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Key words:
- porous ceramics /
- cordierite /
- material synthesis /
- pore-forming agent /
- coal gangue
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