Preparation and application of CMC-Na composite nano-SiO2 coal dust suppressant
In order to solve the problems of dust pollution and spontaneous combustion in coal storage and transportation,a polymer coal flame retardant and dust suppressant was synthesized by aqueous solution polymerization method using modified nano-silicon dioxide(SiO2)and sodium carboxymethyl cellulose(CMC-Na)as the main raw materials and sodium dodecylbenzene sulfonate(SDBS)as the surfactant.The structure of the product was analyzed and characterized using FTIR,XRD,SEM and TG,and its ap-plication properties such as flame retardancy,film-forming flexibility,water retention,wind erosion resist-ance,contact angle and permeability were tested.The results showed that the synthesized flame retardant and dust suppressant was flexible;the CO release of the coal samples added with this flame retardant and dust suppressant was 63.6％lower than that of the coal samples added with water during high tempera-ture combustion,and the flame retardant performance was significantly improved,the water retention was 53.4％higher,and the resistance to wind erosion was 43.1％higher,which meets the requirements of dust prevention in coal storage and transportation;the contact angle of the flame retardant and dust sup-pressant on the surface of the coal was reduced by 36.46° compared with that of water and the penetration rate is 5 times higher than that of water,so it has good penetration and consolidation performance.
silica nanoparticlessodium carboxymethyl celluloseflame retardant and dust suppressantsolidified layer
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