NUMERICAL SIMULATION OF BLASTING DUST POLLUTION IN OPEN-PIT MINES

Abstract

To solve the problem of dust pollution caused by bench blasting in open-pit mines and to solve the current situation of blasting dust control efficiency in most open-pit mines, the blasting dust removal mechanism and migration law were studied in this paper. In this paper, taking the bench blasting in Fushun China open-pit mines as an example, a real-time simulation of blasting dust pollution in open-pit mines was conducted through the numerical simulation by Fluent software and field test using the theories of gas-solid two-phase flow and explosion mechanics. The results showed that in the stage of impact movement and mushroom cloud formation, the explosive gas produced by blasting expanded rapidly, and a large amount of dust rushed into the atmospheric space under the effect of blasting impact kinetic energy, and then diffused. The migration velocity of dust was very lowly without wind. The dust with a particle size of 60-100 m settled slowly, and the dust with a particle size of below 40 m settled with difficulty due to the strong disturbance by air flow. Based on the law of dust pollution, this paper provides a basis for the design of reasonable parameters of dustproof net and related parameters of remote mist emitter, and provides a theoretical and practical basis for the control of blasting dust in other open pit mines.