Transformation of Asbestos into Harmless Waste and Recycle to Zeolite by Hydrothermal Technique
Seiji TAKAHASHI, Hiroyuki ITO and Masato ASAI
Abstract:Asbestos is typically disposed of as hazardous waste in limited managed landfill sites. Recently, it has been difficult to secure the landfill and the cost soaring of disposing the waste has been watched with misgiving. In this research, hydrothermal treatments were studied as a method to decompose asbestos and recycle to zeolite, because the method was considered to enable the cost reduction and zero-emission for disposal of asbestos. Chrysotile, a kind of asbestos was found to be decomposed by a hydrothermal treatment; 175C-24h-14N NaOH soln. Other asbestos were decomposed by the method under similar conditions. Real composite materials including asbestos were confirmed to be decomposed by the hydrothermal method. Zeolite was synthesized from asbestos waste by 2nd hydrothermal treatment with Al(OH)3 after 1st decomposition process. Key Words:Asbestos, Zeolite, harmless, Recycle, Hydrothermal treatment