Investigating rock fragmentation mechanisms under blasting and developing new blasting technologies are important and challenging directions for blast engineering.Recently,with the development of experimental techniqu...Investigating rock fragmentation mechanisms under blasting and developing new blasting technologies are important and challenging directions for blast engineering.Recently,with the development of experimental techniques,the fundamental theory of rock blasting has been extensively studied in the past few decades and has made important achievements in the full understanding of the rock fracturing process under blast loading.It is thus imperative to systematically review the progress in this direction.This paper mainly focuses on the experimental study of rock blasting,including the distribution characteristic of blast energy,evolution of the blast stress field,propagation mechanism of cracks,interaction mechanism between blast waves and cracks,and influence of geostatic stress on rock fragmentation.In addition,some newly developed blasting technologies and their applications are briefly presented.This review could provide comprehensive insights to guide the study on the rock fracturing mechanism under blasting and further provide meaningful guidance for optimizing blast parameters in engineering.展开更多
It was very difficult for the smelting of vanadium-bearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%.After long term development and continuous improvem...It was very difficult for the smelting of vanadium-bearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%.After long term development and continuous improvement,special intensified smelting technologies for vanadium-bearing titanomagnetite by blast furnace were obtained and improved gradually.With the improvement of beneficiated material level and equipment level,smelting intensity has been increased gradually and the highest comprehensive smelting intensity reached 1.45 t/（m3·d）.Technical-economic indexes of blast furnace have also been increased remarkably.The highest utilization coefficient exceeded 2.7 t/（m3·d）on the condition that the burden grade was only about 50%.展开更多
文摘Investigating rock fragmentation mechanisms under blasting and developing new blasting technologies are important and challenging directions for blast engineering.Recently,with the development of experimental techniques,the fundamental theory of rock blasting has been extensively studied in the past few decades and has made important achievements in the full understanding of the rock fracturing process under blast loading.It is thus imperative to systematically review the progress in this direction.This paper mainly focuses on the experimental study of rock blasting,including the distribution characteristic of blast energy,evolution of the blast stress field,propagation mechanism of cracks,interaction mechanism between blast waves and cracks,and influence of geostatic stress on rock fragmentation.In addition,some newly developed blasting technologies and their applications are briefly presented.This review could provide comprehensive insights to guide the study on the rock fracturing mechanism under blasting and further provide meaningful guidance for optimizing blast parameters in engineering.
文摘It was very difficult for the smelting of vanadium-bearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%.After long term development and continuous improvement,special intensified smelting technologies for vanadium-bearing titanomagnetite by blast furnace were obtained and improved gradually.With the improvement of beneficiated material level and equipment level,smelting intensity has been increased gradually and the highest comprehensive smelting intensity reached 1.45 t/（m3·d）.Technical-economic indexes of blast furnace have also been increased remarkably.The highest utilization coefficient exceeded 2.7 t/（m3·d）on the condition that the burden grade was only about 50%.
