Wood nanocellulose modified cemented filling material for deep ground structure filling and preparation method of wood nanocellulose modified cemented filling material

A technology for cementing filling materials and nanocellulose, which is applied in the field of mine filling materials, and can solve the problems that the underground space of goaf is difficult to reuse, and the solid waste of mines cannot meet the needs of filling.

Active Publication Date: 2022-03-08
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the goaf, the mine solid waste such as tailings and gangue produced by mining itself c

Method used

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  • Wood nanocellulose modified cemented filling material for deep ground structure filling and preparation method of wood nanocellulose modified cemented filling material
  • Wood nanocellulose modified cemented filling material for deep ground structure filling and preparation method of wood nanocellulose modified cemented filling material
  • Wood nanocellulose modified cemented filling material for deep ground structure filling and preparation method of wood nanocellulose modified cemented filling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Preparation of lignocellulosic modified cemented filling materials:

[0046] (1) Add 0.5kg of crushed waste wood to 10kg of citric acid-sodium citrate buffer solution with pH5.0, soak for 24h, add 5g of xylanase, heat to 50°C, enzymatically hydrolyze for 1.5h, cool Finally, add 0.25kg cationic styrene-acrylic emulsion, transfer to the ball milling device and carry out ball milling (the ball-to-material ratio is 20:1), the ball milling speed is 2000rpm, and the ball milling time is 6h, after the end, obtain the lignonanocellulose modified by cationic styrene-acrylic emulsion solution;

[0047] (2) Take 40 g of the modified lignonanocellulose solution prepared in step (1), add 4 kg of water to dilute, pour a part of the diluted solution into 12 kg of coal gangue, add to just submerged coal gangue, soak for 12 hours, and leave the rest Mix the diluent with 3kg of cement, 1.5kg of fly ash, and 5kg of tailings, mix all the materials after stirring for 10 minutes, and contin...

Embodiment 2

[0049] Preparation of lignocellulosic modified cemented filling materials:

[0050] (1) Add 0.5kg of crushed waste wood to 10kg of pH4.0 citric acid-sodium citrate buffer solution, soak for 18h, add 5g of xylanase, heat to 45°C, enzymatically hydrolyze for 1.5h, cool Finally, add 0.25kg cationic styrene-acrylic emulsion, transfer to ball milling device and carry out ball milling (ball-to-material ratio is 20:1), ball milling speed is 2200rpm, and ball milling time is 5.5h, obtains the wood nanofiber modified by cationic styrene-acrylic emulsion after finishing prime solution;

[0051] (2) Get 50 g of the modified lignonanocellulose solution prepared in step (1), add 4.5 kg of water to dilute, pour a part of the diluted solution into 10 kg of coal gangue, add to just submerged coal gangue, soak for 14 hours, The remaining dilution was mixed with 4.5kg cement, 1.0kg fly ash, and 5.5kg tailings, and after stirring for 10 minutes, all the materials were mixed, and the stirring wa...

Embodiment 3

[0053] Preparation of lignocellulosic modified cemented filling materials:

[0054] (1) Add 0.5kg of crushed waste wood to 10kg of pH4.5 citric acid-sodium citrate buffer solution, soak for 12h, add 5g of xylanase, heat to 55°C, enzymatically hydrolyze for 2h, after cooling Add 0.25kg of cationic styrene-acrylic emulsion, transfer to ball milling device and carry out ball milling (ball-to-material ratio is 20:1), ball milling speed is 2500rpm, ball milling time is 5h, after the end, obtain the lignonanocellulose solution modified by cationic styrene-acrylic emulsion ;

[0055] (2) Get 60g of the modified lignonanocellulose solution prepared by step (1), add 4.2kg of water to dilute, pour a part of the diluted solution into 11kg of coal gangue, add to just submerged coal gangue, soak for 16h, The remaining diluted solution was mixed with 4kg of cement, 1.5kg of fly ash, and 5.5kg of tailing sand. After stirring for 10 minutes, all the materials were mixed, and the stirring was...

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Abstract

The invention discloses a wood nanocellulose modified cemented filling material for deep ground structure filling and a preparation method of the wood nanocellulose modified cemented filling material, and belongs to the technical field of mine filling materials. The wood nanocellulose modified cemented filling material is prepared from the following raw materials in parts by mass: 300 to 450 parts of cement, 100 to 150 parts of coal ash, 500 to 550 parts of fine aggregate, 1000 to 1200 parts of coal gangue, 0.3 to 0.6 part of modified wood nanocellulose and 400 to 500 parts of water, the modified wood nano cellulose is wood nano cellulose modified by cationic styrene-acrylic emulsion. By optimizing the formula and the preparation process of the mine filling material, the high-strength wood nanocellulose modified cemented filling material capable of being used for filling a deep ground structure is prepared, and a foundation is provided for the idea of reutilization of an underground space formed by a goaf.

Description

technical field [0001] The invention relates to the technical field of mine filling materials, in particular to a lignonanocellulose modified cemented filling material used for deep structure filling and a preparation method thereof. Background technique [0002] For coal mine resources, a large number of coal mines have been mined out, forming goafs, resulting in the breaking of the mechanical balance of the overlying rock on the ore body. The fissure leaks into the goaf, which accelerates the destruction of the overlying rock, causes the movement of the rock strata and the surface, and finally forms the goaf subsidence area. The subsidence area will not only lead to the depletion of groundwater, destruction of cultivated land, and deterioration of the ecological environment, but also damage to local houses, ground fissures and deformation of roads, major projects such as highways, railways, airports, and urban buildings will increase the difficulty of construction due to t...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00724C04B2201/50C04B18/08C04B18/12C04B18/26C04B24/06C04B24/38C04B24/26Y02W30/91
Inventor 吴疆宇马丹浦海尹乾张凯王逸鸣杨朔
Owner CHINA UNIV OF MINING & TECH
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