Improve Buzhaoba Open Pit Blasting Lump Coal Productivity And Individual Flying Objects Controlled Pilot Study

Lump coal, as a major product in the coal market, can't meet the increasing society need of coal resource. So, improving the productivity of lump coal has been an importance mean of the economic development of coal industry. The economic benefit of opencast mine depend to a great extent on the yield of lump coal. The blasting fragmentation of coal rock is an important index for evaluating the blasting effect and increasing the production benefit. Usually, the selling price of lump coal is higher than that of powder coal. In the recent years, a lot of research on the effect factor, such as the habitude of rocks, the explosive ratio, the detonating sequence, and the way of design holes has been done. On the premise of meeting the safety production, the selection of reasonable blasting parameters has become an important part of the blasting production to increase the productivity of lump coal and obtain good economic benefit. So, it is significant to research the productivity improvement of opencast mine by blasting means.Based on the project of the research and design of the open middle-deep hole computer aided design system and the practical condition of Xiaolongtan buzhaoba cole mine, the research of this paper was done through a large number of field tests for taking half the year. The tests result is also predicted and confirmed by the theory analysis, the statistics and calculation of experimental data, and the BP neural network model. The blasting parameter for the safety and high efficiency production of this mine is obtained by doing research on the primary factors of the effect of lump coal and the controlling of flying-stone in blasting.In this paper, the recent progress of lump coal production in blasting at home and abroad is introduced and briefly reviewed. The blasting mechanism and the influential factors of improvement of lump coal blasting are analyzed according to the relevant theory. The effect of the burden in directional blasting, the explosive ratio, the hole arrangement and other blasting parameters on the lump coal ratio is discussed, respectively. The blasting factors fitted to this mine are confirmed through many field tests. The rational parameters can enhance the interaction between the explosive power and the coal-rock and reduce the energy loss and the ratio of powder coal. The large quantities test data and the distribution law of qualified lump coal ratio are processed and discussed by CAD and VB program, respectively. In order to satisfy the requirement of safety production and the control of flying-stone in blasting, this paper also analyze the influential factors to flying-stone in blasting and obtain the reasonable filling length and the burdenand requirement. The blasting lump coal ratio network model based on the property of BP neural network model is proposed and used to preliminary predict the blasting lump coal ratio at different parameters.Based on the project and combined the practical production, this paper had gain good economical benefit for mine industry.