Roof bolt protection and sectioned empty field method for phosphorate rock mining

Abstract

The present invention relates to underground exploitation of phosphorate rock mineral and aims at providing slow inclined middle thick ore body exploiting method. The said exploitation process includes tunneling adit and main inclined tunnel, tunneling middle section main entry, dividing ore body into several panels, tunneling inclined panel slope, dividing the middle section into subsections, dividing subsection ore body into small room via subsection horizontal gallery and cutting raise, supporting roof with anchorage bar and metal net; drilling to bring down with rock drilling machine with cutting raise as free plane; stoping along strike direction; exploding residual ore column to empty area; conveying ore with carry scraper to ore chute and transporting ore with truck. The present invention is suitable for phosphate ore of ore body inclination 0-90 deg and ore body thickness 2-20 m.

Description

technical field [0001] The present invention relates to mining methods, and more particularly, to methods of underground mining of phosphate deposits. Background technique [0002] The underground mining method of gently inclined and inclined medium-thick ore bodies is a worldwide problem, and there is no successful experience at home and abroad. At present, the commonly used mining method in China is evolved from the segmental caving method with pillars or without pillars, the segmental open field method with pillars along the end retreat, or the pillarless pillars along the end retreat and approach retreat. Segmented empty field method, such as Chinese Patent No. 85103513 "Segmented open field caving mining method for continuous withdrawal along the strike". Although these methods have the characteristics of simple technology and easy mastery, because the mining technology is still not perfect so far, the caving of the direct roof cannot be contro...

AI Technical Summary

Problems solved by technology

Although these methods have the characteristics of simple technology and easy mastery, because the mining technology is still not perfect so far, the caving of the direct roof cannot be controlled, and there has always been a large dilution loss (according to measurements, the loss rate reaches 41.12%, and the dilution rate reaches 12.04%), low stope production capacity (only 100 tons per day and night on average), poor safety conditions and other three major problems

At the same time, the existing method of shaft support adopts wood support and concrete shaft support, and the ore extraction method uses low-efficiency pneumatic equipment to extract the ore.

Therefore, the existing underground mining of phosphate deposits is relatively backward in terms of mining methods, shaft support methods, and mining technology and equipment.

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