A caving mining method induced by liquid carbon dioxide blasting

Abstract

The invention discloses a liquid carbon dioxide blasting induced caving mining method. During operation, a reusable carbon dioxide blaster instead of an explosive is delivered into a blast hole; the liquid carbon dioxide in the tube is vaporized under an electrified heating condition to form a high-pressure gas; the blasting energy of the high-pressure gas leads to quick development of joint fissures inside the ore body, and therefore, the ore body is capable of collapsing continuously and naturally under the action of the gravity stress. The liquid carbon dioxide blasting induced caving mining method is suitable for exploiting fracture, joint or structure developed large massive ore deposits or above medium-thick steep-dip solid underground mines crushed to medium solid degree. The method is controllable in blasting energy and release manner, and has the characteristics of operation safety, high production efficiency and low mining cost; the blaster is reusable.

Description

Technical field [0001] The invention relates to a mining method, in particular to an underground mine caving mining method, and is particularly suitable for the mining of thick, massive, medium and solid ore bodies with developed cracks, joints and other structures. Background technique [0002] The mining of thick, medium and solid ore bodies is traditionally mined by subsection or staged ore house method and caving method. Some deposits with high grade and poor rock stability are mined by filling method. When the thickness of this type of ore body changes greatly, the joints and fissures are developed, the direction is discontinuous, and the ore grade is high and the change is large, the mining loss and dilution are large, and the safety of the operation cannot be guaranteed. [0003] This type of ore body can also be mined by natural caving method. Although natural caving mining has the advantages of large production capacity, easy organization and management, safe operation, a...

AI Technical Summary

Problems solved by technology

Although natural caving mining has the advantages of large production capacity, easy organization and management, safe operation, and low mining cost, it is rarely used in China, mainly because it has high requirements for the caving property of the ore body itself and its surrounding rock, and requires If the development of joints and fissures in the ore body is low, it will be difficult for the rock mass to collapse effectively

Some mines at home and abroad have drilled blastholes in the rock-drilling roadway arranged at the caving boundary, and used explosive blasting pre-splitting to control the caving boundary. There are many problems such as large dynamic damage to the surrounding rock of the roof and floor of the ore body, difficulty in controlling the blasting range and block size, and difficulty in blind blasting, which limit the application of the natural caving method.

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