Method and system for filling underground goaf by filling material slurry prepared from weathering pit sand

Abstract

The invention discloses a method and system for filling an underground goaf by filling material slurry prepared from weathering pit sand. The method mainly comprises the following major three steps of firstly, preparing -10mm particle grade weathering pit sand; 2, enabling particle-grade-qualified hill sand, bonding materials and concentration adjusting water into a metering device to be metered through the respective material supply lines; supplying the materials into stirring equipment to be mixed; after uniform stirring, preparing the materials into high-concentration high-flowability structure flow filling material slurry; storing the materials into a buffer standby material cabin; 3, conveying the filling material slurry to an underground goaf to be filled at the pressure of the filling pump through a filling drill hole and an underground filling pipe net. The coal mine filling mining safe requirements can be met; the environment protection is facilitated. The resources of filling materials are wide; the materials can be obtained in nearest places or on the spot; the filling process flow process is simple; the equipment operation is reliable; the investment is low; the filling cost is low; the economic benefits are good. The high-concentration hill sand bonding filling process is used; the water secretion quantity and the separation of the bonding materials can be reduced; the intensity of the filling body is high.

Description

technical field [0001] The invention relates to a cemented filling technology for underground mined-out areas, in particular to a method and system for filling underground mined-out areas by using weathered mountain sand to prepare filling slurry. Background technique [0002] Cemented filling technology has become an important part of today's filling mining method, representing the development direction of filling technology, which can not only meet the mining safety requirements, reduce geological disasters, but also be conducive to environmental protection. It can effectively reduce the mining dilution rate and loss rate, improve the recovery rate of useful minerals, and has good economic and social benefits. [0003] In the cemented filling mining method, tailings cemented filling currently accounts for a considerable proportion, which can make full use of tailings resources and reduce the discharge of solid waste to the surface. It is an effective way to achieve land sa...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method of using weathered mountain sand to prepare filling slurry to fill the underground goaf and the implementation system of the method, so as to solve the problems of high cost, large investment and complicated process of using tailings cemented filling

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