Aqueous three-phase foam supported by fly ash for coal spontaneous combustion prevention and control

作者：Qin, Botao^*; Lu, Yi; Li, Yong; Wang, Deming

来源：Advanced Powder Technology, 2014, 25(5): 1527-1533.

DOI：10.1016/j.apt.2014.04.010

• Three-phase foams
• Fly ash
• Coal mine fires
• Foam stability

This work deals with the preparation and characterization of fly ash (FA) supported aqueous three-phase foams containing N-2 for coal spontaneous combustion prevention and control. Uniform and dense three-phase foams featuring FA contents between 20 wt.% and 33 wt.% are prepared in batch mode using a home-made foam generating column with an internal Venturi tube. The effect of FA on the foamability, static and dynamic stability of the three-phase foams is discussed. Compared with two phase foams, the FA supported three-phase foams manifest higher static and dynamic stability, which increases with the FA content. Base on the excellent static and dynamic stability, a structure model to attach FA particles at the N-2-water interfaces of the three-phase foams was proposed to elucidate the observed behaviors. The as prepared FA supported three-phase foams, exhibiting excellent coal fire extinguishing characteristic, can be used as a promising fire extinguishing material, especially for preventing the large coal area spontaneous combustion or extinguishing fire in high and unknown locations in goaf.

• 出版日期2014-9
• 单位中国矿业大学（北京）