The explosion effects and physical process in rock mass by cylindrical charges are discussed.The maximum explosion cavity radius and the coefficient of effective explosion work are found through mechanical model and n...The explosion effects and physical process in rock mass by cylindrical charges are discussed.The maximum explosion cavity radius and the coefficient of effective explosion work are found through mechanical model and numerical method.The dependance of explosion parameters on time is got.The results show that the maximum explosion cavity radius produced by cylindrical charge of ammonium trinitro-toluene No.2 explosive in limestone and diabase is 1.50 and 1.26 times respectively as much as that of blasthole;and the coefficient of effective explosion work is 0.71 and 0.54 respectively as much as that of the blasthole.展开更多
The zeta potential of different lithotypes of two coals with high content of inertinite in Shenfu Coalfield has been studied Moreover, the effects of pH value and the addition of surfactants and inorganic salts on zet...The zeta potential of different lithotypes of two coals with high content of inertinite in Shenfu Coalfield has been studied Moreover, the effects of pH value and the addition of surfactants and inorganic salts on zeta po-tential have also been discussed. It has been concluded that the zero potential point (ZPP) of vitrain is between about 3 30 and 3. 40 of pH value, hut that of fusain is between 2. 00 and 2.10 of pH value. Furthermore, it has been found thai vitrain could reach its ZPP once a small amount of cationic surfactants and some inorganic salts were added to pulps However, only when a large amount of cationic surfactants and some inorganic salts were added to pulps, could fusain reach its ZPP The conclusions are useful in the efficient separation and preparation of single petrographic constituent展开更多
文摘The explosion effects and physical process in rock mass by cylindrical charges are discussed.The maximum explosion cavity radius and the coefficient of effective explosion work are found through mechanical model and numerical method.The dependance of explosion parameters on time is got.The results show that the maximum explosion cavity radius produced by cylindrical charge of ammonium trinitro-toluene No.2 explosive in limestone and diabase is 1.50 and 1.26 times respectively as much as that of blasthole;and the coefficient of effective explosion work is 0.71 and 0.54 respectively as much as that of the blasthole.
基金Project supported by the Foundation of China Coal Sciences.
文摘The zeta potential of different lithotypes of two coals with high content of inertinite in Shenfu Coalfield has been studied Moreover, the effects of pH value and the addition of surfactants and inorganic salts on zeta po-tential have also been discussed. It has been concluded that the zero potential point (ZPP) of vitrain is between about 3 30 and 3. 40 of pH value, hut that of fusain is between 2. 00 and 2.10 of pH value. Furthermore, it has been found thai vitrain could reach its ZPP once a small amount of cationic surfactants and some inorganic salts were added to pulps However, only when a large amount of cationic surfactants and some inorganic salts were added to pulps, could fusain reach its ZPP The conclusions are useful in the efficient separation and preparation of single petrographic constituent
