Study of inhibition effect of Ca²⁺ on phosphorus-contained active groups in coal

Study of Butylated Hydroxytoluene Inhibiting the Coal Oxidation at Low Temperature: Combining Experiments and Quantum Chemical Calculations

“…In order to inhibit the coal spontaneous combustion, the inhibitors are widely used. At present, common inhibitors are mud, three-phase foam, sodium silicate gel, and halogen salt solution, − whereas halogen salt solution mainly includes MgCl, CaCl, NaCl, and Na 2 NO 3 , which are widely used because of its low cost. − After the halogen salt solution is sprayed on the coal surface, due to its strong moisture absorption, a liquid film can be formed on the surface of coal particles to isolate oxygen and active groups. At the same time, it can also accelerate the heat released by coal oxidation through moisture evaporation.…”

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

“…According to the inhibition mechanism of spontaneous coal combustion, inhibitors can be divided into two groups of physical and chemical inhibitors (Li et al., 2012a). Physical inhibitors are mostly water-absorbing salts such as CaCl 2 , MgCl 2 and NaCl (Ma et al., 2015; Wang et al., 2015; Xiao et al., 2017). On the other hand, chemical inhibitors, such as antioxidant and ionic liquids, can react with active molecules and free radicals generated by coal at low temperatures, thus interrupting free radical reaction chain of oxidized coal (Li et al., 2017, 2018; Wang et al., 2014).…”