Investigating the parameters of dispersion in the plane system of charges at granular quartz deep mining

摘要

Introduction. There is much concern about raw material overgrinding as a result of blasting when mining granular quartz. The main blasting method of deep mining is borehole blasting with rings of continuous charges. The main drawbacks of the method include nonuniform distribution of explosives along the plane of the broken layer and the fact that the significant energy of continuous charges is spent on the shattering effect which automatically overgrinds the material in the area nearest the blast. Research aim is to develop the technology of blasting and optimize its parameters ensuring the reduced output of overgrinded quartz fraction.Methodology includes the development and application of a mathematical model of drilling and blasting parameters forecast in granular quartz deep mining.Research concept. A technology of breaking has been proposed by way of solution to the given problem. The technology lies in the concept that the uniformity of explosive energy concentration distribution in the broken layer is ensured by charges dispersion by air gaps and the particular order of their arrangement in the plane of the ring. To implement the technology, a method of forming dispersed charges in deep upholes has been developed;;the method does not require additional efforts and equipment.Results. A special technique has been created, which makes it possible to determine the parameters of dispersion ensuring the relevant specific consumption of explosives along the whole plane of the broken layer. The dependence between the output of the overgrinded quartz fraction and the parameters of dispersion in the plane system of charges has been determined. Engineering and economic evaluation of breaking technology options has been carried out as compared to the conventional one. Potential economic benefit has been estimated from the developed technology application for It of produced ore.