Optimization Study On Stope Ventilation System In Baishitan Underground Iron Mine

With the mining time become longer and longer and shallow resource wasexhausted constantly, the mining depth of the non-coal mining is increasing and theventilated environment underground (such as temperature, humidity, etc.) become worse.The mining ventilated and the harmful gases produced by the stope blasting haveseriously affected the mine safety production..The paper aims at the ventilation problems in non-coal underground miningcombining with the actual field conditions of Baishitan iron mining area in Qijiang. Andit has carried out a research about the movement law of toxic gases after undergroundstope blasting, which has important theoretical and practical significance for effectivelyand economically ventilating to the working face and rapidly reducing the smokedensity of working face to ensure the life safety and health of underground workers.The major accomplishments are as follows:①The stope of the iron ore underground mine and ventilation physical model areestablished based on the air-flow theory in stope.②Establishing the numerical simulation about the ventilation law in stope inunderground mine by hydrodynamics simulations software FLUENT, it determines themovement law of air-flow in the stope. The research shows that, the air-flow is notmade full use of when it through the stope. And It doesn’t work in the process of smokein deep stope, which lead the waste of air-flow. Toxic and harmful gases areaccumulated in the rear of the stope, which cause great difference in CO concentrationsnear the working-face and the rear of the stope, the time of stope exhaust is too long, theefficiency of ventilation is low.③According to the distribution condition of the air-flow in the stope, the paperdetermines the mine stope ventilation optimization methods and put forward the specificmine ventilation technology. Setting up an air intake and an air return grille in eachintake airway and air return laneway close to the rear of the stope, shutting advancedIntake entrance, which formed two inlet and return stope ventilation system, and it willstrengthen the stope ventilation after blasting. The optimized stope can obtain flowvelocity and concentration field in any position by numerical simulation. Simulationresults show that when the air intake at the speed of1.5m/s, stope face and the rear ofstope CO down significantly, there is little difference in the concentration, and the time also greatly decrease.The research results have a certain practical significance for similar mine to mineventilation measures. Because of the complexity of the different of undergroundnon-coal mine ventilation system, on the part of the non-coal mining ventilationoptimization and gas diffusion should become deep and diverse in the future. We needto further in-depth study and solve these problems.