Point pillar type full-ore-deposit middle-section-free upward high-layering continuous propelling fill mining method

Abstract

The invention relates to an underground mining technology, in particular to a point pillar type full-ore-deposit middle-section-free upward high-layering continuous propelling fill mining method. In the technical scheme, large panel mining is adopted; point pillars are reserved in a stope; an accurate mining project is arranged on rock; the height of a slice drift is 20 meters; light exposure roof control is adopted; the layering height is increased to 7.5-8 meters; a headspace of 2 meters is reserved after every filling for serving as the operating space of a next layer; no middle section lane or roof and bottom pillars are reserved; and continuous propelling and mining of a full ore deposit from bottom to top layer after layer is adopted. The method has the beneficial effects that: the middle section exploration and transportation work amount is reduced, the slice drift work amount is reduced, the layering height is increased, and the mining efficiency is increased; a full-ore-deposit upward continuous propelling fill mining process is adopted, so that the continuity of a milling, filling and discharging process is enhanced, the using amount of cement is reduced greatly, and thefilling cost is reduced; and the problems of large quantity of layering filling times, low mining efficiency and high cost are solved.

Description

Technical field [0001] The invention relates to an underground mining technology, in particular to a point-pillar type full ore bed continuous advancing filling mining method from the middle section up to the high layer. Background technique [0002] The shallow high-grade and easy-to-mining reserves of China's iron ore resources are gradually exhausted, while most of the newly added reserves are low-grade and difficult-to-mining resources. Among them, the low-grade deposits of sedimentary metamorphic rocks account for 10% of my country's total iron ore resources. More than 50%, it has become the main mining ore body of new mines. At the same time, the recovery rate of this type of ore is between 60-70%, the beneficiation ratio is as high as 3.4-4.2, and the discharge of tailings is relatively large. [0003] In the past, the underground mining of iron ore was mainly based on the pillarless sub-level caving method, which was at a high dilution rate and a low recovery rate. A...

AI Technical Summary

Problems solved by technology

Through technical measures, optimize and innovate ore block mining layout, stope structural parameters, mining and filling promotion methods, reduce the amount of development and mining, shorten the connection time of mining and filling, improve mining intensity, reduce mining and filling costs, and improve mining technology mechanization and continuity, thus solving the problem of high cost and low efficiency in layered filling mining, which is conducive to the promotion in iron mines

Images