Method for reinforcing pre-controlled roof room pillar method ore pillars

A ore pillar and slag technology, which is applied in the field of reinforcement and pre-control roof pillar reinforcement, can solve the problems of increasing mining loss and dilution rate, increasing difficulty in mining ore bodies, and threatening the safety of operators. The effect of improving the reinforcement effect, improving the supporting effect, and shortening the installation time

Active Publication Date: 2020-04-14
河北大白阳金矿有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the pillar becomes unstable, it will cause the surrounding rocks of the roof to fall, which may lead to large-scale ground pressure disasters, such as: smashing the operating equipment in the stope, causing casualties; the mining of the ore body becomes more difficult, and the mining loss dilution rate Increase; compressed air forms a shock flow, threatening the safety of operators, etc.

Method used

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  • Method for reinforcing pre-controlled roof room pillar method ore pillars
  • Method for reinforcing pre-controlled roof room pillar method ore pillars
  • Method for reinforcing pre-controlled roof room pillar method ore pillars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A kind of grouting slurry, comprising liquid A and liquid B with a volume ratio of 1:1, wherein,

[0073] -Liquid A, by weight percentage, includes 52% of 42.5 grade Portland cement, 33% of fly ash, 4.5% of slag, 1.2% of aluminum dihydrogen phosphate and 2.4% of sodium hexametaphosphate, and the water-cement ratio is 0.8; , the chemical composition of cement, fly ash and slag is shown in Table 1, and the particle size is shown in Table 2;

[0074] -Liquid B, by weight percentage, comprises water glass 22%, fly ash 16% and surplus water; Wherein, the concentration of water glass is 25-35 Baume degrees, and the amount of unburned carbon in fly ash is 12.3wt% , the particle size D50 is 22.4 μm.

[0075] The chemical composition (wt%) of table 1 raw material

[0076] raw material silica Aluminum oxide iron oxide Calcium Oxide magnesium oxide sulphur trioxide LOSS f-CaO cement 22.82 4.53 2.63 63.07 1.83 2.71 1.63 0.69 fly ash 52.4...

Embodiment 2

[0084] A kind of grouting slurry, comprising liquid A and liquid B with a volume ratio of 1:1, wherein,

[0085] -Liquid A, by weight percentage, comprises 42.5 grade Portland cement 52%, fly ash 33%, slag 4.5%, aluminum dihydrogen phosphate 1.2% and sodium hexametaphosphate 2.0%, water-cement ratio is 0.8; , the chemical composition and particle size of cement and fly ash are shown in Table 1 and Table 2 respectively;

[0086] -Liquid B, by weight percentage, comprises 22% of water glass, 28% of fly ash and the balance of water; wherein, the concentration of water glass is 35 degrees Baume, and the amount of unburned carbon in fly ash is 12.3wt%. The diameter D50 is 22.4 μm.

[0087] The preparation method of the grouting slurry is the same as Example 1.

Embodiment 3

[0089] A kind of grouting slurry, comprising liquid A and liquid B with a volume ratio of 1:1, wherein,

[0090] - Liquid A, by weight percentage, including 52% of 42.5 grade Portland cement, 33% of fly ash, 4.5% of slag, 2.0% of aluminum dihydrogen phosphate and 3.0% of sodium hexametaphosphate, and the water-cement ratio is 0.7-1.1 ; Wherein, the chemical composition and particle size of cement and fly ash are shown in Table 1 and Table 2 respectively;

[0091] -Liquid B, by weight percentage, comprises 22% of water glass, 5% of fly ash and the balance of water; wherein, the concentration of water glass is 35 degrees Baume, and the amount of unburned carbon in fly ash is 12.3wt%. The diameter D50 is 22.4 μm.

[0092] The preparation method of the grouting slurry is the same as Example 1.

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Abstract

The invention provides a method for reinforcing pre-controlled roof room pillar method ore pillars, and belongs to the technical field of mining. According to the method, anchor rod operation is conducted on the ore pillars through a grouting method, a grouting slurry comprises a liquid A and a liquid B, the liquid A comprises, by weight, 45%-63% of Portland cement, 25%-46% of coal ash, 3%-7% of slag, 1.0%-2.0% of aluminum dihydrogen phosphate and 2.0%-3.0% of sodium hexametaphosphate, and the water-cement ratio is 0.7-1.1; and the liquid B comprises 15-25% of water glass, 5-28% of fly ash andthe balance of water. The grouting slurry provided by the invention has good stability, fluidity and stone rate, the gelation time is adjustable, and the stone body has high compressive strength anddurability; according to the invention, the supporting effects of anchor rods and grouting are organically combined together, the double effects of anchor rod supporting and grouting reinforcement areachieved, the integrity of the ore pillars can be ensured, the rock mass structure and the stress state of the ore pillars are improved, the stress concentration is reduced, and the self-bearing capacity of the ore pillars is improved.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a method for reinforcing and reinforcing ore pillars by the pre-controlled roof pillar method. Background technique [0002] Mineral resources are non-renewable resources, and the realization of safe, efficient and full exploitation of mineral resources has always been the goal pursued by mining engineering and management personnel. On the premise that the ore rock is stable, the room-and-pillar mining method is the most effective mining method for mining horizontal and gently inclined ore bodies. In the process of mining, it is generally necessary to leave various types of ore pillars. As the mining face advances, The engineering environment of the stope is also constantly changing, and the goaf is getting larger and larger, making the stability of the stope more prominent, which is directly related to the safe production of the mine and the excavation planning of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26E21D20/02E21D21/00C04B111/70
CPCC04B28/26C04B2111/70E21D20/021E21D21/0026C04B7/02C04B18/08C04B18/141C04B22/16C04B12/04Y02W30/91
Inventor 唐涛张伟陈海文
Owner 河北大白阳金矿有限公司
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