CN110256033B - High-porosity foam for spontaneous combustion control of coal in goaf and preparation method thereof - Google Patents

High-porosity foam for spontaneous combustion control of coal in goaf and preparation method thereof Download PDF

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Publication number
CN110256033B
CN110256033B CN201910219596.7A CN201910219596A CN110256033B CN 110256033 B CN110256033 B CN 110256033B CN 201910219596 A CN201910219596 A CN 201910219596A CN 110256033 B CN110256033 B CN 110256033B
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foam
parts
goaf
alkaline
coal
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CN110256033A (en
Inventor
陆伟
亓冠圣
贺正龙
路瑶
吴磊
郭宝龙
胡浩
孔彪
李金亮
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/16Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00724Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/28Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • C04B2111/285Intumescent materials

Abstract

The invention discloses a high-porosity foam for spontaneous combustion prevention of coal in a goaf and a preparation method thereof, and belongs to the technical field of greenhouse gas emission reduction and coal mine safety production. The composite material comprises the following raw materials in parts by weight: 30-70 parts of an alkaline material, wherein the alkaline material is carbide slag, kiln dust, cement dust or a combination of a plurality of materials; 10-30 parts of a reinforcing agent, wherein the reinforcing agent is coal ash, blast furnace slag or a combination of the coal ash and the blast furnace slag; 1-5 parts of a foam stabilizer, wherein the foam stabilizer is a silicone polyether emulsion; 1-3 parts of a curing agent, wherein the curing agent consists of sodium aluminate and anhydrous gypsum; 15-28 parts of a foaming agent, wherein the foaming agent is composed of hydrogen peroxide and a hydrogen peroxide activator. The invention can realize the foaming of the alkaline waste, takes the foam as a carrier to convey the industrial alkaline waste to the goaf in a large flow, and realizes three-dimensional distribution in a large space of the goaf; makes full use of high-yield industrial alkaline waste, and is beneficial to environmental protection.

Description

High-porosity foam for spontaneous combustion control of coal in goaf and preparation method thereof
Technical Field
The invention relates to the technical field of greenhouse gas emission reduction and coal mine safety production, in particular to a high-porosity foam for coal spontaneous combustion prevention, filling reinforcement and carbon retention in a goaf and a preparation method thereof.
Background
The economic mode based on low energy consumption, low pollution and low emission becomes the currentMajor features and trends in the development of the world economy. China uses coal as main energy source and has about 50% of CO2From coal-based power generation, research and application of CCS technology to CO realization in China2The emission reduction has very important significance.
The goaf formed after coal mining, especially the old goaf of the deep well, has good CO2Adsorptivity and airtightness. The existing 7000 coal mines in China have CO2A great potential for sequestration, low cost CO2Underground sequestration provides an important approach. Meanwhile, the coal left in the underground goaf is naturally and seriously ignited, so that serious disasters and accidents are easily caused. The method is an effective fire-proof and explosion-proof method by filling the plugging material into the goaf to plug the air leakage channel. Carbide slag, kiln dust, cement dust and the like are industrial alkaline wastes with huge annual output (more than 1000 ten thousand tons per year) in China, occupy valuable land resources and cause serious harm to soil, water and human health. The main component of the alkaline waste is CaO or Ca (OH)2Isobasic substances with great CO absorption2Thereby greatly reducing the potential of emission. A goaf is formed after coal mining, and the ground surface is easy to sink. After being injected into the goaf, the alkaline material can also play a role in filling and reinforcing and preventing the ground surface from sinking along with the evolution of mechanical properties.
Based on the actual demands of the goaf on filling fire prevention and extinguishing materials and filling reinforcing materials and high-yield basic waste material to CO2The huge potential of sealing and reducing emission needs to be developed based on industrial alkaline waste materials, and CO can be reserved2Can also prevent and treat disasters to form deep well underground space CO2An integrated method for sealing, storing, reducing emission and preventing and controlling disasters.
Disclosure of Invention
The invention aims to provide a high-porosity foam for spontaneous combustion prevention and control of coal in a goaf and a preparation method thereof, which are low in cost, environment-friendly and capable of absorbing a large amount of CO in the goaf under a coal mine2
One of the tasks of the invention is to provide a high-porosity foam for spontaneous combustion control of coal in a goaf, which adopts the following technical scheme:
a foam for preventing spontaneous combustion of coal in a goaf comprises the following raw materials in parts by weight:
30-70 parts of an alkaline material, wherein the alkaline material is one or a combination of more of carbide slag, kiln dust and cement dust;
10-30 parts of a reinforcing agent, wherein the reinforcing agent is one or a combination of fly ash and blast furnace slag;
1-5 parts of a foam stabilizer, wherein the foam stabilizer is a silicone polyether emulsion;
1-3 parts of a curing agent, wherein the curing agent consists of sodium aluminate and anhydrous gypsum;
15-28 parts of a foaming agent, wherein the foaming agent is composed of hydrogen peroxide and a hydrogen peroxide activator;
2-8 parts of a surfactant, wherein the surfactant consists of sodium dodecyl sulfate and alpha-sodium alkenyl sulfonate.
As a preferable scheme of the invention, the weight ratio of the sodium aluminate to the anhydrous gypsum is 3: 1; the hydrogen peroxide is 15-25 parts by weight of industrial hydrogen peroxide with the mass fraction of 30%, and the hydrogen peroxide activator is 0.5-3 parts by weight.
In another preferred embodiment of the present invention, the weight ratio of the sodium dodecyl sulfate to the sodium α -alkenyl sulfonate is 1: 1.
The invention also aims to provide a preparation method of the foam for preventing spontaneous combustion of coal in the goaf, which sequentially comprises the following steps:
a. adding an alkaline material, a reinforcing agent, a curing agent and a foaming agent into a stirring tank, and stirring to form alkaline material powder;
b. b, sequentially adding water, a foam stabilizer and a surfactant into the alkali powder in the step a, and stirring to form alkaline foam slurry;
c. adding hydrogen peroxide into the alkaline foam slurry obtained in the step b, uniformly stirring, and continuously conveying to a goaf by using a grouting pump, wherein the alkaline foam slurry is subjected to secondary foaming under the action of the hydrogen peroxide, and after the alkaline foam slurry is solidified, high-porosity foam is formed in the goaf;
d. conveying CO to goaf2,CO2Is absorbed by foam to realize CO in the goaf2A large amount of minerals are stored, and meanwhile, the fire prevention, explosion prevention and filling reinforcement are realized.
Further, in the step d, CO is conveyed to the goaf in a pipeline pre-buried or drilling mode2
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the preparation method of the foam with high porosity provided by the invention fully utilizes high-yield industrial alkaline waste, and is beneficial to environmental protection;
(2) the preparation method of the high-porosity foam body provided by the invention can realize foaming of the alkaline waste, takes the foam as a carrier to convey the industrial alkaline waste to the goaf in a large flow, and realizes three-dimensional distribution in a large space of the goaf;
(3) according to the preparation method of the high-porosity foam body, the alkaline waste carries a large amount of air under the action of the surfactant and stirring to form foam slurry, after the foam slurry is conveyed to the goaf, secondary foaming of the foam slurry can be initiated by decomposition of hydrogen peroxide, high porosity and high specific surface area of the foam slurry are further promoted, and CO is avoided2The problem that the CO can only be absorbed on the surface of the foam slurry and can not enter the foam slurry is that the CO is absorbed on the surface of the foam slurry2The adsorption provides huge adsorption reaction sites, which is beneficial to realizing the high-efficiency utilization of the alkaline waste;
(4) according to the preparation method of the high-porosity foam body, after the foam slurry is covered on the surface of the residual coal in the goaf, the coal oxygen contact is blocked, the spontaneous combustion of the coal is inhibited, the high-porosity foam body can be prevented from being fired and exploded, and the safety production of a mine is guaranteed;
(5) according to the preparation method of the high-porosity foam body provided by the invention, the high-porosity foam slurry formed in the goaf has a plurality of mutually-penetrated compact pore channel structures and is CO injected in the later stage2The mineralization of (A) provides sufficient reaction sites to realize CO2And (5) performing large-scale sealing for a long time.
Detailed Description
The invention provides a high-porosity foam for spontaneous combustion control of coal in a goaf and a preparation method thereof, and the invention is described in detail below by combining specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
The raw materials selected by the invention can be purchased from commercial sources.
Example 1:
the raw materials and the parts by weight are as follows:
30 parts of carbide slag, 30 parts of fly ash, 5 parts of silicone resin polyether emulsion, 3 parts of curing agent, 28 parts of foaming agent and 4 parts of surfactant.
The preparation method comprises the following steps:
step one, adding carbide slag, fly ash, a curing agent and a foaming agent into a stirring tank, and stirring to form alkali powder;
step two, sequentially adding water, a foam stabilizer and a surfactant into the alkali powder obtained in the step one, and stirring to form alkaline foam slurry;
thirdly, adding hydrogen peroxide into the alkaline foam slurry obtained in the second step, uniformly stirring, and continuously conveying to a goaf by using a grouting pump, wherein the alkaline foam slurry is subjected to secondary foaming under the action of the hydrogen peroxide, and after the alkaline foam slurry is solidified, high-porosity foam is formed in the goaf;
fourthly, conveying CO to the goaf2,CO2Is absorbed by foam to realize CO in the goaf2A large amount of minerals are stored, and meanwhile, the fire prevention, explosion prevention and filling reinforcement are realized.
Example 2:
the raw materials and the parts by weight are as follows:
70 parts of kiln dust, 10 parts of blast furnace slag, 1 part of silicone polyether emulsion, 1 part of curing agent, 15 parts of foaming agent and 3 parts of surfactant.
The preparation method is the same as example 1.
Example 3:
the raw materials and the parts by weight are as follows:
65 parts of cement dust, 10 parts of blast furnace slag, 1 part of silicone resin polyether emulsion, 1 part of curing agent, 15 parts of foaming agent and 8 parts of surfactant.
The preparation method is the same as example 1.
Example 4:
the raw materials and the parts by weight are as follows:
50 parts of cement dust and carbide slag, 20 parts of blast furnace slag, 1 part of silicone resin polyether emulsion, 1 part of curing agent, 25 parts of foaming agent and 3 parts of surfactant.
The preparation method is the same as example 1.
Example 5:
the raw materials and the parts by weight are as follows:
60 parts of carbide slag, 15 parts of blast furnace slag and fly ash in total, 3 parts of silicone resin polyether emulsion, 3 parts of curing agent, 15 parts of foaming agent and 4 parts of surfactant.
The preparation method is the same as example 1.
The invention can be realized by taking the prior art as a reference to the parts which are not described, and the combination mode which is obvious to the technical personnel in the field and is obtained by the teaching of the invention is within the protection scope of the invention.

Claims (4)

1. The preparation method of the foam for the spontaneous combustion control of the coal in the gob is characterized in that the foam for the spontaneous combustion control of the coal in the gob comprises the following raw materials in parts by weight:
30-70 parts of an alkaline material, wherein the alkaline material is carbide slag, kiln dust, cement dust or a combination of a plurality of materials;
10-30 parts of a reinforcing agent, wherein the reinforcing agent is coal ash, blast furnace slag or a combination of the coal ash and the blast furnace slag;
1-5 parts of a foam stabilizer, wherein the foam stabilizer is a silicone polyether emulsion;
1-3 parts of a curing agent, wherein the curing agent consists of sodium aluminate and anhydrous gypsum;
15-28 parts of a foaming agent, wherein the foaming agent is composed of hydrogen peroxide and a hydrogen peroxide activator;
2-8 parts of a surfactant, wherein the surfactant consists of sodium dodecyl sulfate and alpha-sodium alkenyl sulfonate;
the preparation method of the foam for the spontaneous combustion control of the coal in the goaf sequentially comprises the following steps of:
a. adding an alkaline material, a reinforcing agent, a curing agent and a foaming agent into a stirring tank, and stirring to form alkaline material powder;
b. b, sequentially adding water, a foam stabilizer and a surfactant into the alkali powder in the step a, and stirring to form alkaline foam slurry;
c. adding hydrogen peroxide into the alkaline foam slurry obtained in the step b, uniformly stirring, and continuously conveying to a goaf by using a grouting pump, wherein the alkaline foam slurry is subjected to secondary foaming under the action of the hydrogen peroxide, and after the alkaline foam slurry is solidified, high-porosity foam is formed in the goaf;
d. conveying CO to goaf2,CO2Is absorbed by foam to realize CO in the goaf2A large amount of minerals are stored, and meanwhile, the fire prevention, explosion prevention and filling reinforcement are realized.
2. The method for preparing the foam for goaf coal spontaneous combustion control according to claim 1, wherein the method comprises the following steps: the weight ratio of the sodium aluminate to the anhydrous gypsum is 3: 1; the hydrogen peroxide is 15-25 parts by weight of industrial hydrogen peroxide with the mass fraction of 30%, and the hydrogen peroxide activator is 0.5-3 parts by weight.
3. The method for preparing the foam for goaf coal spontaneous combustion control according to claim 2, wherein the method comprises the following steps: the weight ratio of the sodium dodecyl sulfate to the sodium alpha-alkenyl sulfonate is 1: 1.
4. The method for preparing the foam for goaf coal spontaneous combustion control according to claim 1, wherein the method comprises the following steps: in the step d, CO is conveyed to the goaf in a pipeline pre-buried or drilling mode2
CN201910219596.7A 2019-03-22 2019-03-22 High-porosity foam for spontaneous combustion control of coal in goaf and preparation method thereof Active CN110256033B (en)

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Publication number Priority date Publication date Assignee Title
CN110812771A (en) * 2019-11-22 2020-02-21 安徽理工大学 Foam fire prevention and extinguishing material and preparation method and application thereof
CN113018749A (en) * 2021-03-08 2021-06-25 中国矿业大学 Preparation method of vaporization slag fire prevention and extinguishing material

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CN101445353A (en) * 2008-12-26 2009-06-03 西安森兰科贸有限责任公司 Foaming expansive filling agent used for mine fire prevention
CN101955341A (en) * 2010-09-27 2011-01-26 丁雅荣 Fly ash-based grouting filling material
CN102701672A (en) * 2012-05-25 2012-10-03 徐州中国矿大岩土工程新技术发展有限公司 Foam filling body for coal mine goaf filling and preparation filling method of foam filling body
CN103570316A (en) * 2013-11-06 2014-02-12 天地科技股份有限公司 Filled expanding material
CN103964766A (en) * 2014-04-29 2014-08-06 胡相明 Pulverized fuel ash-cement foam material for controlling spontaneous combustion of coal and preparation method of pulverized fuel ash-cement foam material
CN103977517A (en) * 2014-05-08 2014-08-13 董福明 Coal mine fire preventing and extinguishing gel
CN104074542A (en) * 2014-05-10 2014-10-01 河北充填采矿技术有限公司 Coal mine CO2 concrete type filling method
CN105218023A (en) * 2015-09-24 2016-01-06 东南大学 A kind of drift-sand foam material and preparation method
CN107129203A (en) * 2017-04-25 2017-09-05 三峡大学 A kind of electrolytic manganese residues base paste filling material and preparation method thereof
CN107285677A (en) * 2017-08-09 2017-10-24 中国矿业大学 Solidification CO is sealed up for safekeeping using foam geopolymer filling mine goaf2Method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101445353A (en) * 2008-12-26 2009-06-03 西安森兰科贸有限责任公司 Foaming expansive filling agent used for mine fire prevention
CN101955341A (en) * 2010-09-27 2011-01-26 丁雅荣 Fly ash-based grouting filling material
CN102701672A (en) * 2012-05-25 2012-10-03 徐州中国矿大岩土工程新技术发展有限公司 Foam filling body for coal mine goaf filling and preparation filling method of foam filling body
CN103570316A (en) * 2013-11-06 2014-02-12 天地科技股份有限公司 Filled expanding material
CN103964766A (en) * 2014-04-29 2014-08-06 胡相明 Pulverized fuel ash-cement foam material for controlling spontaneous combustion of coal and preparation method of pulverized fuel ash-cement foam material
CN103977517A (en) * 2014-05-08 2014-08-13 董福明 Coal mine fire preventing and extinguishing gel
CN104074542A (en) * 2014-05-10 2014-10-01 河北充填采矿技术有限公司 Coal mine CO2 concrete type filling method
CN105218023A (en) * 2015-09-24 2016-01-06 东南大学 A kind of drift-sand foam material and preparation method
CN107129203A (en) * 2017-04-25 2017-09-05 三峡大学 A kind of electrolytic manganese residues base paste filling material and preparation method thereof
CN107285677A (en) * 2017-08-09 2017-10-24 中国矿业大学 Solidification CO is sealed up for safekeeping using foam geopolymer filling mine goaf2Method

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