Thousands Of Vanadium Ore Thin Bedded Ore Body Mining Blasting Parameters Optimization Research

The vanadium mine of Qianjiaping was designed to adopt block stoping with horizontal fan-shaped longhole,and now is still in infrastructure stage.The ore-rock is thin-bedded with joints and fissures development.In order to obtain the best-fitting blasting parameters of the ore-rock, based on the crater tests, the thesis did optimization study about longhole blasting parameters.First the thesis designed8orthogonal test progams according to similarity theory of soil and rock blasting,when blasted we took samples from ore piles and screened them.The project did mathematical statistics analysis on that hole patterns’and detonating parameters’influence on the rate of rock size,finally find out the optimal solution of blasting parameters’.Then the project applied the optimal solution to deep hole blasting industrial tests in stopes with special bedding feature.When designing deep hole blasting parameters,the author discussed about gravity effection on ore rock with much joints and fissures,then adjusted burden after calculating bulge moving time and geometric dimensions of blasting effect.The result of screened samples showed that the rate of rock size less than40mm increased, larger than80mm reduced.At the last horizontal fan-shaped longhole blsting parameters we optimized is:ro w spacing3.0m, holes bottoms spacing3.6m,row-hole50ms blasting, bottom initiation, the explosive unit consumption about0.38kg/t.The thesis validated the blasting parameters’applicability and rationality in this kind of ore rock with joints and fissures development,provided theoretical foundation for mine to produce good economic benefit through saving the cost of mining and beneficiation. The thesis also validated it’s absolutely feasible to optimize deep hole blasting parameters with a method based on Livingston blasting crater theory, uniting similarity theory of soil and rock blasting and orthogonal test of shallowblasting. The explosive unit consumption that we had obtained was a little more than other mines which ore rock are compact and intact,this proved that the joints and fissures in rock could leak explosion energy,then cause the rise up of the explosive unit consumption.