Ore drawing technique for controlling fluidity of ore rocks via pillarless cornice end-wall sublevel caving method
A stage caving and pillarless technology, which is applied in ground mining, mining equipment, underground mining, etc., can solve problems such as difficult release of rocks, easy release of ore, loss and dilution of ore at the end, and achieve small loss and dilution , low cost and high production capacity
Active Publication Date: 2012-08-01
ANSTEEL GRP MINING CO LTD
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[0011] The present invention aims at the big problem of mining loss and dilution at the end, and adopts a method of injecting a liquid medium that plays a bonding role in the overburden rock, so that the overburden rock is in a bonded state and changes the fluidity of the overburden rock. According to "overburden rock and caving The fluidity of the ore is obviously different, so that the ore is easy to be released and the rock is not easy to be released". A kind of ore-drawing process is proposed to control the fluidity of the ore by the stage caving method of the end wall without the bottom pillar and the overhanging eaves. The purpose is to effectively improve the ore recovery. rate, reduce the loss of ore dilution
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[0029] The specific embodiments of the present invention will be further described below in conjunction with the drawings.
[0030] Such as figure 1 , 2 , 3, 4, 5, and 6, the present invention’s sill-pillar overhanging end wall stage caving method for controlling the fluidity of the ore rock includes dividing the ore body into stages, which are arranged in a rhombic staggered manner. Stoping approach 1, divide the stages into sections, and complete rock drilling, blasting and ore extraction in the mining tunnel 1. figure 1 Middle 2 is the overburden rock, and 3 is the ore body caving range line for each access road. Pre-concentrated rock drilling is used in the mining roadway 1 to arrange the upward fan-shaped medium and deep holes 5, and the reverse mining is carried out under the overburden. When the inner subsections stop until the end wall is at a position where the lower subsection is one eaves distance from the upper subsection, the stoping is based on the stage, and each su...
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The invention relates to an ore drawing technique for controlling fluidity of ore rocks via pillarless cornice end-wall sublevel caving method. The pillarless cornice end-wall sublevel caving method is characterized by comprising the following steps of: after ore drawing at each sublevel is completed, injecting and permeating a liquid medium into overlaying rocks surrounding the ore drawing port and the end wall at both sides and front part of the end part of a mining roadway besides the lowest sublevel roadway in each sublevel by using a grouting method, laying aside for 1-3 days, eliminating excessive water in the overlaying rocks through water drainage ditches on both sides of the mining roadway, and performing blasting and actual mining in the next ore caving step. Therefore, the overlaying rocks have obviously different fluidity from caved ores, ores are easy to discharge and rocks are not easy to discharge, the ore extraction rate is effectively increased, and the dilution loss of ores is reduced. The ore drawing technique has the advantages that the cornice structure is convenient to inject water and ores are basically discharged in the form of pure ores and also has the advantages of small loss dilution, simple technique, great production capacity, low cost, safety, reliability, easiness, feasibility and good benefits.
Description
Technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to a ore drawing process for controlling the fluidity of ore and rock by a stage caving method without a sill pillar and eaves end wall. Background technique [0002] The underground mining method includes three basic procedures: mining, cutting and stoping. According to the method of ground pressure maintenance, it is divided into three categories: open mining method, filling method and caving mining method. Caving mining method is to fill the goaf with caving surrounding rock. The mining method to control and manage the ground pressure, the end-drawing caving method of large-scale drawing has been obtained worldwide due to its simple process structure, high mining intensity, high efficiency, high degree of mechanization, safety, and low mining cost. Wide range of applications. There are two main types of end-drawing caving methods for large-scale ore dra...
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IPC IPC(8): E21C41/22E21F16/00
Inventor 邵安林
Owner ANSTEEL GRP MINING CO LTD