Nagae Hajime Suzuki Kazuo Sugiyama Toyohiko

(12266-98, Anagahora, Shimoshidami, Moriyama, Nagoya 463-8560 Japan,Materials Research Institute for Sustainable Development, National Institute of Advanced industrial Science and Technology (AIST)

Abstract: A technology for recycling industrial wastes as ceramic raw materials was studied for the purpose of attaining closed material circulation and a state of sustainable development. In this report, a development of recycling ceramics, including powder preparation, body preparation, forming, and firing technology, is described. A lowering of firing temperature and a decreasing of firing duration of the ceramics were also studied with the aim of protecting the environment and energy-saving.

    Many kinds of sintered composites were prepared from powders of industrial wastes, such as ceramic wastes, refuse glass, buned ash, waste clay, Sekidei(waste from alumina production), and coal ash. Physical properties of the sintered bodies were measured to investigate the adequate firing temperature for each composite. An addition of refuse glass to the composite was extremely effective in lowering the firing temperature. One of the practical ceramic bodies obtained in this study is a composite of 80-20% fine powder of ceramic waste, 20-80% bumed waste, and 30% retuse glass. The composite could be formed by dry pressing.After firing at 1100 degrees centigrade, the water absorption and bulk density of the composite were 9.9% and 2.52g/cm, respectively. Fast firing was applicable to the composite.

Keywords: Industrial waste, recycling, low-temperature firing, ceramics