Coal gangue activity exciting agent and high-fluidity and high-solid-content cemented filling slurry

A technology of active activator and coal gangue, which is applied in the field of cemented filling slurry, can solve the problems of low strength, pipe plugging, and low strength of filling materials, and achieve the effects of good excitation, simple proportioning and low cost

Pending Publication Date: 2022-07-29
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to provide a coal gangue active activator to solve the current coal gangue used for goaf filling material slurry, which needs Add cement and other cementitious materials, otherwise its potential activity cannot be fully exerted, resulting in the problem of low strength of the filling material after hardening; at the same time, the invention also provides a high-fluidity, high-solid content cemented filling slurry to solve the problem of the current goaf. The surrounding environment of the filling area is destroyed due to the high water content of the filling material slurry and the strength after hardening is low, or the pipe plugging problem is caused by long-distance and long-term transportation when the water content is low

Method used

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  • Coal gangue activity exciting agent and high-fluidity and high-solid-content cemented filling slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The coal gangue activity activator of this embodiment is condensed by 5.5kg of calcined limestone, 8.5kg of sodium silicate, 77kg of caustic soda, 8.3kg of dihydrate gypsum and 0.7kg of naphthalene-based water reducing agent-sodium naphthalenesulfonate formaldehyde The material was processed as follows:

[0034] Step A: Mix 5.5kg of calcined limestone, 8.5kg of sodium silicate, 77kg of caustic soda and 8.3kg of gypsum dihydrate to obtain mixed raw material A;

[0035] Step B: The mixed raw material A is ball-milled with a ball mill for 40 min to obtain the mixed raw material B; the specific surface area of ​​the mixed raw material B reaches 380 m 3 / ㎏;

[0036] Step C: mixing raw material B and water in a ratio of 1:0.8 by mass and then placing them on a high-speed mixer and stirring for 10min, and the stirring speed of the high-speed mixer is 1100rpm; then carry out ultrasonic vibration treatment for 30min, ultrasonic frequency is 60KHz, ultrasonic wave The power is ...

Embodiment 2

[0047] The coal gangue activity activator of this embodiment is composed of 4.5kg of calcined limestone, 7.5kg of sodium silicate, 67.8kg of caustic soda, 18.8kg of hemihydrate gypsum and 1.4kg of naphthalene-based water reducing agent-sodium naphthalenesulfonate formaldehyde The condensate is obtained by the following treatment:

[0048] Step A: Mix 4.5kg of calcined limestone, 7.5kg of sodium silicate, 67.8kg of caustic soda and 18.8kg of gypsum dihydrate to obtain mixed raw material A;

[0049] Step B: The mixed raw material A is ball-milled with a ball mill for 60 min to obtain the mixed raw material B; the specific surface area of ​​the mixed raw material B reaches 520 m 3 / ㎏;

[0050] Step C: mixing raw material B and water in a ratio of 1:0.8 by mass and then placing them on a high-speed mixer and stirring for 12min, and the stirring speed of the high-speed mixer is 1500rpm; then carry out ultrasonic vibration treatment for 33min, ultrasonic frequency is 70KHz, ultraso...

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Abstract

The invention discloses a coal gangue active activator and high-fluidity high-solid-content cemented filling slurry, and the coal gangue active activator is composed of the following components: 2.5-15 parts by weight of calcined dolomite or calcined limestone, 3-9 parts by weight of silicate, 35-80 parts by weight of caustic soda, 3-22 parts by weight of gypsum and 0.025-1.4 parts by weight of a water reducing agent. The high-fluidity and high-solid-content cemented filling slurry is composed of water and a cemented filling material. The cemented filling material is composed of 65-95 parts by weight of coal gangue and 5-35 parts by weight of a coal gangue activity exciting agent; the mass fraction of water in the high-fluidity and high-solid-content cemented filling slurry is 7.2-9.8 wt%. The coal gangue can be hydrated and hardened to generate enough strength without using cementitious materials such as cement, and the cemented filling slurry is low in water content and good in fluidity, does not shrink after being hardened, and can be well topped due to micro-expansion.

Description

technical field [0001] The invention relates to the technical field of cemented filling slurry. Specifically, it is an active activator of coal gangue and a cemented filling slurry with high fluidity and high solid content. Background technique [0002] Coal gangue is a solid waste produced in the process of mine development, coal mining and coal preparation. Its output accounts for about 10% to 25% of the total coal mining, and it is the largest industrial solid waste. The long-term accumulation of coal gangue has caused serious pollution to water sources, soil, air and ecological environment. At present, the comprehensive utilization of coal gangue is mostly concentrated in the fields of road construction, power generation, brick making and chemical industry, but the utilization rate of these fields is still low. The use of coal gangue for backfill mining and gob filling is considered to be the field with the highest utilization rate. Coal gangue is rich in clay mineral...

Claims

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Application Information

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IPC IPC(8): C04B24/22C04B24/18C04B24/24C04B24/16C04B24/20C04B24/26C04B24/00C04B24/02C04B24/04C04B22/14C04B7/24C04B28/02
CPCC04B40/0039C04B7/243C04B28/02C04B2111/00146C04B2111/00724C04B22/064C04B12/04C04B22/062C04B22/143C04B24/226C04B18/12C04B22/002
Inventor 滕德强袁东锋谢福星袁帅王苏龙张杰
Owner BEIJING CHINA COAL MINE ENG CO LTD
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