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Pumpable coal mine goaf backfilling material

A goaf and backfilling technology, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of lack of cohesive characteristics, inability to form a stable self-supporting filling body, etc., to improve work efficiency, Avoid road subsidence and achieve the effect of pumpability

Inactive Publication Date: 2015-04-29
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of cohesive properties of filling materials filled by hydraulic filling, a stable and self-supporting filling body cannot be formed, and there is also the problem of drainage

Method used

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  • Pumpable coal mine goaf backfilling material
  • Pumpable coal mine goaf backfilling material
  • Pumpable coal mine goaf backfilling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The pumpable coal mine goaf backfill material includes cement, fly ash, coal gangue powder, and modifiers. The modifiers are composed of water reducers, plastic stabilizers and retarders. Cement is 10%, Fly ash is 9.7%, coal gangue powder is 80%, and modifier is 0.3%. The modifier is composed of a water reducer, a plastic stabilizer and a retarder, and is calculated as a percentage by weight of the cement. Calcium lignosulfonate is 1.5%, polyacrylamide is 1.0%, and sodium gluconate is 0.5%.

[0029] The water-solid ratio is 0.8.

[0030] According to GB / T 50080-2002 Standard for Test Methods for Performance of Ordinary Concrete Mixtures and GB / T 50081-2002 Standard for Test Methods for Mechanical Properties of Ordinary Concrete, various performance indexes of pumpable coal mine goaf backfills are tested.

[0031] Its performance indicators are shown in the following table:

[0032]

Embodiment 2

[0034] The pumpable coal mine goaf backfill material includes cement, fly ash, coal gangue powder, and modifiers. The modifiers are composed of water reducers, plastic stabilizers and retarders. Cement is 15%, Fly ash is 9.83%, coal gangue powder is 75%, and modifier is 0.17%. The modifier is composed of water reducer calcium lignosulfonate, plastic stabilizer hydroxypropyl methylcellulose and retarder Sodium citrate is composed of 0.5% calcium lignosulfonate, 0.5% hydroxypropyl methylcellulose and 0.1% sodium citrate based on its weight percentage of cement.

[0035] The water-solid ratio is 0.75.

[0036] According to GB / T 50080-2002 Standard for Test Methods for Performance of Ordinary Concrete Mixtures and GB / T 50081-2002 Standard for Test Methods for Mechanical Properties of Ordinary Concrete, various performance indexes of pumpable coal mine goaf backfills are tested.

[0037] Its performance indicators are shown in the following table:

[0038]

Embodiment 3

[0040] The pumpable coal mine goaf backfill material includes cement, fly ash, coal gangue powder, and modifiers. The modifiers are composed of water reducers, plastic stabilizers and retarders. Cement is 10%, Fly ash is 19.8%, coal gangue powder is 70%, modifier is 0.2%, and the modifier is composed of water reducer calcium lignosulfonate, plastic stabilizer polyacrylamide and retarder sodium citrate and The composition of the mixture obtained by mixing sodium gluconate at a mass ratio of 1:1, in terms of its weight percentage of cement, the calcium lignosulfonate is 1%, polyacrylamide is 0.8%, sodium citrate and sodium gluconate are 0.2%.

[0041] The water-solid ratio is 0.7.

[0042] According to GB / T 50080-2002 Standard for Test Methods for Performance of Ordinary Concrete Mixtures and GB / T 50081-2002 Standard for Test Methods for Mechanical Properties of Ordinary Concrete, various performance indexes of pumpable coal mine goaf backfills are tested.

[0043] Its performance in...

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Abstract

The invention provides a pumpable coal mine goaf backfilling material which comprises the following raw materials in percentage by mass: 10-15% of cement, 10-20% of fly ash, 65-80% of coal gangue powder, 1-1.5% of water reducing agent, 0.5-1% of plastic stabilizer and 0.1-0.5% of retarder (the water reducing agent, plastic stabilizer and retarder are mass percents in cement). The water-solid ratio of the pumpable coal mine goaf backfilling material is 0.65-0.8. The invention also provides a method for preparing the pumpable coal mine goaf backfilling material, which comprises the following steps: proportionally weighing and uniformly mixing the cement, fly ash and coal gangue powder according to the formula, adding a certain amount of water in which the water reducing agent, plastic stabilizer and retarder are dissolved, and stirring to prepare the uniform slurry, thereby obtaining the pumpable coal mine goaf backfilling material.

Description

Technical field [0001] The invention relates to a coal mine goaf backfill material, in particular to a pumpable coal mine goaf backfill material. technical background [0002] At present, coal is still the main energy source in our country. Every year, our country has to mine and consume a large amount of coal. However, the harm caused by coal mining is also increasing day by day, mainly including ground subsidence caused by coal mine goaf, coal gangue accumulation and ecological damage. If the goaf area of ​​the coal mine is not followed up by reasonable follow-up treatment, the impact of ground collapse on the environment is particularly serious. [0003] Dry filling is the earliest filling method for mine goaf management at home and abroad. Dry filling is to transport the collected dry filling materials such as boulders, sand and gravel, soil, industrial waste residues to the area to be filled by manpower, gravity or mechanical equipment to form a compressible loose filling bo...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C04B18/12C04B24/06C04B24/10
CPCY02W30/91
Inventor 刘志华李园枫
Owner TIANJIN CHENGJIAN UNIV