Sudden emissions and casualty accidents caused by abnormal enrichment of hydrogen sulfide in coal mines are becoming more and more frequent. This paper reviews the existing prevention and control technologies of hydrogen sulfide (H₂S) in coal mines at home and abroad. According to the distribution characterictics, the occurrence modes and the emission forms of H₂S in coal mines, the prevention and control technologies of H₂S in coal-bearing strata, and the airflow in tunnel and underground water body have special features. The methods used include the neutralization by injecting alkalizer through drilling in coal seams with high pressure, spraying alkalizer in tunnel, the attenuation by increasing the wind amount, changing the ventilation method, pumping, dredging and blocking the water that contains H₂S as well as the comprehensive prevention and control methods. The basic agent adopted includes the sodium carbonate (with the mass percentage concentration of about 0.5%~3.0%), the sodium bicarbonate solution and some basic solution with some additives, such as the Surfactant, the Fenton reagent, the Sodium dodecylbenzene sulfonate, the Sodium hypochlorite or the Chloramine-T. The performance and the main problems of each prevention and control technology are analysed and a comprehensive method of prevention and control of H₂S in coal mines is proposed. According to the current technological level as well as the cost, for the effective prevention and control of H₂S, the occurrence, the distribution and the emission forms of H₂S in coal mines as well as its content should be taken into consideration.

coal mine  /  hydrogen sulfide  /  prevention and control technology  /  research progress