Development and application of modified lye for treating hydrogen sulphide in coal mine

Abstract

To improve the absorption efficiency of alkaline liquor treated with hydrogen sulphide in coal mines, a single sodium carbonate lye was taken as the basic raw material to modify the absorption of lye by adding the surfactant sodium dodecyl benzene sulfonate (SDBS) and the oxidant hydrogen peroxide. Respectively, the effects of different concentrations of surfactants and oxidants in sodium carbonate solution on the removal of hydrogen sulphide gas were investigated. The results show that the concentration of sodium carbonate solution is positively correlated with the removal rate of hydrogen sulphide. When the concentration of sodium carbonate solution increases to 2%, the initial removal rate of hydrogen sulphide is close to 100%, however, the problem of secondary dissipation of hydrogen sulphide is more significant after vibration. With the increase of SDBS and hydrogen peroxide concentration, the removal rate of hydrogen sulphide from sodium carbonate solution respectively increases to 93.1% and 86.2%. Finally, through experimental analysis and in situ measurements, the optimal ratio of the modified lye in the hydrogen sulphide treatment of this experiment is as follows: the concentration of sodium carbonate solution is shown to be 2%, the concentration of surfactant is 0.4%, and the concentration of oxidant is 0.6%. On this basis, by comparing the 40,201 working face of Xiaozhuang Coal Mine with the 40,202 working face, it is concluded that the average removal rate of the modified lye is 93.5%, and the treatment effect of removing hydrogen sulphide is significant.