Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 371, Issue -, Pages 643-654Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.03.041
Keywords
Sodium silicate gel; Fire prevention; Water retention capacity; Inhibition; Polyacrylamide
Categories
Funding
- National Key R&D Program of China [2018YFC0807900]
- National Natural Science Foundation of China [51674038, 51874193]
- Shandong Province Natural Science Foundation [ZR2018JL019, ZR2017PEE024]
- Shandong Province Science and Technology Development Plan [2017GSF220003]
- Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents [2017RCJJ010, 2017RCJJ037]
- Shandong Province First Class Subject Funding Project [01AQ05202]
- SDUST Research Fund [2018TDJH102]
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Novel gel materials are proposed for fire prevention and extinction in coal mines, where spontaneous combustion of coal continues to pose a significant risk. Cationic polyacrylamide (CPAM), anionic polyacrylamide (HPAM), and carboxymethyl cellulose (CMC) were each introduced separately into a sodium silicate (WG) gel, to obtain three gels labeled as CPAM/WG, HPAM/WG, and CMC/WG. A crosslinking agent, aluminum citrate, was subsequently added to the HPAM/WG and CMC/WG gels to afford two novel interpenetrating network hydro gels, HPAM-Al3+/WG and CMC-Al3+/WG, respectively. Among the various gels, the HPAM-Al3+/WG hydrogel exhibits the best seepage capacity, water retention capacity, compressive strength, and inhibition characteristics, which effectively resolve the post-water-loss cracking and pulverization problems commonly associated with inorganic consolidated silica gels. The microstructures of all the gels were investigated by scanning electron microscopy and their inhibitory effects on the oxidation of hydroxyl and methylene groups in coal at high temperatures were analyzed by Fourier transform infrared spectroscopy. Elemental mapping by energy dispersive X-ray spectroscopy indicated that the inorganic silica gel blends uniformly with the polymeric gel. Fire
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