高铝粉煤灰制备陶瓷膜支撑体的性能研究

发布时间：2018-04-02 21:27

本文选题：多孔陶瓷　切入点：高铝粉煤灰　出处：《中国陶瓷》2017年04期

【摘要】：粉煤灰是电厂燃烧煤之后的固体废弃物,粉煤灰的高附加值应用是国家重点扶持的一个方向。采用高铝粉煤灰制备多孔陶瓷支撑体可以代替氧化铝多孔陶瓷在污水处理、固液分离等方面的应用,可以大大减少成本。以高铝粉煤灰为原料,分别使用淀粉和碱式碳酸镁作为造孔剂,羧甲基纤维素钠(CMC)为粘结剂,采用模压法成型,分别在1200~1500℃烧结下制备5组不同含量的多孔陶瓷样品,并测试其孔隙率、收缩率、气通量、水通量、抗折强度等性能。实验结果表明,烧结温度和造孔剂的种类和含量对多孔陶瓷的性能影响显著。碱式碳酸镁造孔作用明显优于淀粉,且随着造孔剂含量的增高,孔隙率、气通量、水通量逐渐升高,抗折强度略有降低。随着烧结温度的提高,气通量、水通量先升高后降低,在1350℃时达到最大值4854.24m~3/(m~2·h·bar)、48.61m~3/(m~2·h·bar)。综合考虑,造孔剂为20%碱式碳酸镁在1350℃温度下烧结2~3 h,作为多孔陶瓷支撑体性能最佳。
[Abstract]:Fly ash is a power plant burning solid waste after coal, fly ash and high added value application is a key support of the state. The preparation of porous ceramic support can replace the porous alumina ceramics in wastewater treatment using high alumina fly ash system, application of solid-liquid separation and so on, can greatly reduce the cost of using high alumina fly ash as raw materials. Starch, and magnesium carbonate were used as pore forming agent, sodium carboxymethyl cellulose (CMC) as the binder, using the method of moulding and sintering respectively at 1200~1500 DEG C prepared under 5 different content of porous ceramic samples, and to test its porosity, shrinkage, gas flux, water flux, flexural strength and other performance. The experimental results show that the performance of sintering temperature and pore type and content of porous ceramics was significant. Magnesium carbonate pore was superior to that of starch, and with the increase of the content of pore forming agent, the porosity, Gas flux, water flux increased, the flexural strength decreased slightly. With the increase of sintering temperature, gas flux, water flux increased first and then decreased, reached the maximum value of 4854.24m~3/ at 1350 DEG C (m~2 h bar), 48.61m~3/ (m~2 h bar). Considering the pore forming agent is 20% basic magnesium carbonate sintering at the temperature of 1350 DEG C under 2~3 h, as the best performance of porous ceramic support.

【作者单位】：合肥工业大学材料科学与工程学院;北京低碳清洁能源研究所;
【分类号】：TQ174.7

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