Authors: I.A. Ermakova

Title of the article: Width of ore flow in process of ore drawing from working face for systems with caving ores and containing breeds

Year: 2018, Issue: 3, Pages: 44-49

Branch of knowledge: Earth sciences

Index UDK: 622.646

DOI: 10.26730/1999-4125-2018-3-44-49

Abstract: The mining systems including caving of ores and enclosing rock are characterized by increased losses and ore dilution. Increasing the efficiency of the systems with sublevel caving of ores and enclosing rock is ensured by improving of ore drawing from working face. It is necessary to know the parameters of the flow that runs out into the mine roadways. The current theory of ore drawing is based on the fact that the volume of ore produced is proportional to the width of the draw raise or the diameter of the hole. This regularity does not apply to the ore flow, which changes the direction of its motion. In this paper, new regularities of the process of ore drawing are presented. A distinctive feature of the layered ore drawing is that the ore flow is formed at the wall of the ore massif, which is one of the flow boundaries. In the case of ore drawing from the working face, the outlet hole as such is absent. In the study it is established that the outflow of ore from the working face occurs through a conditional hole. It is formed at the level of the roof of the delivery workings and has a certain size. The flow boundary is described by a single parabolic equation for particles of different sizes. The obtained dependence makes it possible to calculate the width of the flow zone at different heights, depending on the ore size and the disintegration coefficient.

Key words: sublevel caving systems ore drawing width of ore flow

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