Coal Mine Cemented Filling Technology

Abstract

The invention discloses a coal mine consolidated fill technical skill; the filling material formulation of which is as follows according to the weight percentage: skeletal material: 15-30% of coal tailing coal gangue and / or 15-30% of industrial slag, coarse waste: 10-20% of poor-quality sand discarded by construction trades and / riversand, fine stuff: 25-35% of lime sludge with more than 10% of sandy soil and calcium oxide and / or fly ash; the fill slurry concentration of the filling material processed by batching, watering and stirring is controlled to be 50-85%; the fill slurry is conveyed into a goaf operation surface by an industrial filling pump and a pipeline for filling. The technical skill implements the consolidated fill on an underground dead area, controls underground water burst problem, increases safe coefficient of production, furthest liberates the pressed coal amount, increases recovery ratio, controls ground surface sedimentation, protects environment and ground surface vegetation, prolongs the mining age limit of the mine, and increases the industrial economic benefits.

Description

technical field [0001] The invention relates to a coal mine waterproof filling method, in particular to a coal mine cementation filling process technology method. Background technique [0002] The problem of water damage in underground coal mine production enterprises is common. Water is a great threat to the safe production of mines. [0003] In order to solve the problem of water damage, the filling method is widely used in China. In the early 1980s, my country began to study the filling technology of high-water cementitious materials, and established a theoretical system of hydration, hardening and synthesis of high-water materials. During the operation period in the 1980s, during the first successful study of the high-water entry filling technology of gobside entry retention without coal pillars, experiments were carried out in Hebi and Kailuan Bureaus, and achieved complete success. However, due to high filling costs, progress was slow. In the early 1990s, filling wi...

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Problems solved by technology

[0008] Since the minefield is located 2.5km away from the Laoha River, the water-bearing sand layer at the bottom of the riverbed covers the upper part of the coal-measure strata, which is the Quaternary sand layer containing water in the pores. The hydrogeological conditions are very complicated, which has caused great difficulties and inconveniences to underground coal mining. Potential safety hazards, and even major flood accidents

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