Recycle of inorganic wastes by hydrothermal technology

2005 4th International Symposium on Environmentally Conscious Design and Inverse Manufacturing Pub Date : 2005-12-12 DOI:10.1109/ECODIM.2005.1619231

M. Oida, H. Maenami, N. Isu, E. H. Ishida

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Abstract

In order to build up a sustainable society, the authors have investigated the recycling technology of inorganic wastes with low energy consumption. Sewage sludge ash, concrete waste, and construction sludge were used as raw materials. These waste were mixed with Ca(OH) ₂ and formed by uniaxial pressing. The specimens were autoclaved for 6 h at 180degC under saturated steam pressure. The flexural strength of the specimens varied from 3.2 to 9.4 MPa with the bulk density of 1200 to 1550 kg/m³. The strength development was caused by filling of the initial void among the particles with tobermorite (Ca₅(Si₆O₁₈H₂)middot4H ₂O) and hydrogarnet (Ca₃Al₂(SiO₄)(OH)₈) formed by hydrothermal treatment. To apply these solidified inorganic waste to paving tile, determined that Ca(OH) ₂/wastes mass ratio is 15/85 for plant production condition. The paving tile had comparable performance with brick, block and concrete pavement

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水热法回收无机废弃物

为了建设可持续发展的社会，对低能耗无机废弃物的回收利用技术进行了研究。以污水污泥灰、混凝土废料和建筑污泥为原料。将这些废渣与Ca(OH) 2混合，通过单轴压合形成。在饱和蒸汽压力下，180℃高压灭菌6小时。试件抗弯强度为3.2 ~ 9.4 MPa，容重为1200 ~ 1550 kg/m3。强度的发展是由水热作用形成的托贝莫来石(Ca5(Si6O18H2) middot4h2o)和水榴石(Ca3Al2(SiO4)(OH)8)填充颗粒之间的初始空隙引起的。将这些固化后的无机废弃物应用于铺装瓷砖，确定了工厂生产条件下Ca(OH) 2/废弃物质量比为15/85。铺装瓦具有与砖、砌块、混凝土路面相当的性能

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2005 4th International Symposium on Environmentally Conscious Design and Inverse Manufacturing

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