Study on carbon dioxide blasting mining and driving equipment and technology

According to the slow driling and blasting driving speed.low saietydust occurred from the blasting and many harmful gas problems of the seam gateway in the trial mine,a carbon dioxide blasting fechnology sitable for the seam gateway drving in the iral mine was proided.Acaoon dioide basting miner was researched and developed with the National Patent.T'he operation principle of the equipment was to apply the high prssure from the phase transitin during the lituid cabon dokide and then would be aff cted to the surounding cal and rock mass.Therefore,the coal and rock breaking was realied. The drwving experiment practices o a 1 600 m sean gatewvay in the underground mine showed that in comparison with the conventional blasting.the cabon dioxide blasting would have the high safety igh blastng effect and good basting effct.The lump cal rate could be improved over 20% and would be reached at 65%~78%.The coal throw distance was reduced about 40 % and was 0 ~ 3 m.The dust and blasting fume volume was reduced about 50%,the caroon dioxide volume fraction was 0.02%～0.09% generally and the cabon monoxide volume fraction was 3~15)×*10Rgenefal All thosecould create an excelent drving working environment in the underground mnine,could be favorableto the physical health of the operation personnel and could realize the safety and high efficient driving.