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    • 5. 发明申请
    • A METHOD FOR TREATING ASBESTOS
    • 一种治疗ASBESTOS的方法
    • WO1988010234A1
    • 1988-12-29
    • PCT/DK1988000105
    • 1988-06-27
    • FORSKNINGSCENTER RISOBJERRE, BelindaSORENSEN, Emil
    • FORSKNINGSCENTER RISO
    • C01B33/22
    • A62D3/36A62D2101/41B09B3/0066C01F5/00C01F5/20
    • Asbestos fibers, especially chrysotile mineral fibers, are decomposed and eliminated by being reacted with an acid component, e.g. sulphuric acid. The reaction is carried out at a pH of less than 5 for a period of time (e.g. up to several weeks or months) which is sufficient to obtain a substantially total decomposition of the fibers. The reaction may be speeded up by being subjected to heating, e.g. of a temperature in the range of 5-100 DEG C, and/or by a physical treatment. The decomposition may be carried out continuously or in batch. Also, the asbestos fibers may be decomposed by reaction with an aqueous solution of ammonium sulfate at a temperature of above 200 DEG C, preferably about 260 DEG C. The ammonium sulfate reaction is carried out in an autoclave, e.g. in the form of a pipe reactor or tubular reactor, in which the suspension of asbestos fibers and ammonium sulfate is subjected to a turbulent flow, i.e. having a Reynolds number of above 2000, and the reaction is generally terminated within 30 minutes. The magnesium which is released from the asbestos material during the treatment may be recovered.
    • 石棉纤维,特别是温石棉矿物纤维,通过与酸成分反应而被分解和消除,例如, 硫酸。 反应在小于5的pH下进行一段时间(例如达数周或数月),足以获得纤维的基本上全部的分解。 反应可以通过加热加速,例如 的温度在5-100℃范围内,和/或通过物理处理。 分解可以连续或分批进行。 此外,石棉纤维可以在高于200℃,优选约260℃的温度下与硫酸铵水溶液反应而分解。硫酸铵反应在高压釜中进行,例如, 以管式反应器或管状反应器的形式,其中石棉纤维和硫酸铵的悬浮液经受湍流,即雷诺数超过2000,反应通常在30分钟内终止。 可以回收在处理期间从石棉材料释放的镁。