CN111119977A - Steel slag-based explosion suppression material for suppressing coal dust explosion and preparation method and application thereof - Google Patents
Steel slag-based explosion suppression material for suppressing coal dust explosion and preparation method and application thereof Download PDFInfo
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- CN111119977A CN111119977A CN201911348121.4A CN201911348121A CN111119977A CN 111119977 A CN111119977 A CN 111119977A CN 201911348121 A CN201911348121 A CN 201911348121A CN 111119977 A CN111119977 A CN 111119977A
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- steel slag
- explosion
- explosion suppression
- suppression material
- coal dust
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- 238000004880 explosion Methods 0.000 title claims abstract description 118
- 230000001629 suppression Effects 0.000 title claims abstract description 68
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000002893 slag Substances 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 239000000463 material Substances 0.000 title claims abstract description 56
- 239000002817 coal dust Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000011049 filling Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 229910001653 ettringite Inorganic materials 0.000 claims abstract description 14
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 12
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 12
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 12
- 238000010025 steaming Methods 0.000 claims abstract description 10
- 239000012265 solid product Substances 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 8
- 238000010000 carbonizing Methods 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000003828 vacuum filtration Methods 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 5
- 239000000047 product Substances 0.000 claims abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 12
- 239000001569 carbon dioxide Substances 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 238000003763 carbonization Methods 0.000 claims description 4
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000011258 core-shell material Substances 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 238000005065 mining Methods 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 239000012153 distilled water Substances 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 4
- 239000001095 magnesium carbonate Substances 0.000 description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 4
- 239000000347 magnesium hydroxide Substances 0.000 description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 4
- 239000013081 microcrystal Substances 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
- E21F5/12—Composition of rock dust
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of explosion suppression materials, and particularly relates to a steel slag-based explosion suppression material for suppressing coal dust explosion and a preparation method and application thereof. The method comprises the following steps: 1) mixing steel slag particles, acid solution capable of dissolving aluminum and iron elements in the steel slag and persulfate, stirring under a heating condition, adjusting the pH of a reaction solution to be alkaline, and standing to obtain an upper-layer flocculent turbid solution and a lower-layer residue; then separating out flocculent turbid liquid and residues; 2) stirring and washing the flocculent turbid liquid with water, dropwise adding amino modified polydimethylsiloxane for reaction, separating out a solid product, drying and grinding to obtain superfine filling powder; 3) washing the residue, steaming, and carbonizing to obtain porous residue; 4) and filling the superfine filling powder into the pores of the porous residues by adopting a vacuum filtration method, adding ettringite, cement and water, mixing into particles, and drying to obtain the finished product. The invention takes the steel slag as the base to prepare the raw material, and the obtained explosion suppression material has good explosion suppression effect.
Description
Technical Field
The invention belongs to the technical field of explosion suppression materials, and particularly relates to a steel slag-based explosion suppression material for suppressing coal dust explosion and a preparation method and application thereof.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Coal dust explosion is a reaction process of rapid oxidation of oxygen in air and coal dust under the action of a high-temperature or certain ignition energy heat source, and belongs to a major disaster accident in a mine. The complex chain reaction comprises the following four processes: (1) when combustible coal exists in a state of powder fly ash, oxidation reaction rapidly occurs upon encountering a fire source due to a significant increase in the total surface area; (2) when the temperature reaches 300-400 ℃, the dry distillation phenomenon of the coal is rapidly enhanced, and combustible gases such as methane, ethane, propane, butane, hydrogen and about 1% of other hydrocarbons are released; (3) after the generated combustible gas absorbs energy at high temperature, a gas shell, namely an activation center, is formed around dust particles. When the energy of the activation center reaches a certain degree, the chain reaction process starts, the free radicals increase rapidly, and the flash combustion of dust particles occurs; (4) the heat formed by the flash combustion is transferred to the surrounding dust particles and causes them to participate in the chain reaction, resulting in a rapid cycle of the combustion process. When the combustion is continuously intensified to make the flame speed reach hundreds of meters per second, the combustion of coal dust is suddenly changed into explosion under a certain critical condition. Thus, the essential prerequisites for the occurrence of a coal dust explosion are the concentration of suspended coal dust that can explode, the high temperature heat source that ignites the detonated coal dust, and sufficient oxygen content, respectively.
Aiming at controlling explosion, scholars at home and abroad respectively carry out research on prevention and reduction of explosion hazards from the aspects of explosion suppression, explosion venting, explosion suppression and the like, and achieve great results. Currently, most of the most widely used explosion suppression materials are solid powders with fire extinguishing properties, which mainly utilize the extinguishing effect on flames to prevent the propagation of explosion flames. However, the present inventors found during use that: the explosion suppression effect of some existing explosion suppression materials is not matched with the explosion mechanism and course, so that the explosion suppression effect is poor. Therefore, there is a need for further research and study of explosion suppression materials having better explosion suppression effects.
Disclosure of Invention
Aiming at the problems, the invention provides the steel slag-based explosion suppression material for suppressing coal dust explosion and the preparation method and application thereof.
The first object of the present invention: provides a preparation method of a steel slag-based explosion suppression material for suppressing coal dust explosion.
Second object of the invention: provides the steel slag-based explosion suppression material for suppressing coal dust explosion prepared by the method.
The third object of the present invention: provides the application of the steel slag-based explosion suppression material for suppressing coal dust explosion.
In order to realize the purpose, the invention discloses the following technical scheme:
firstly, the invention discloses a preparation method of a steel slag-based explosion suppression material for suppressing coal dust explosion, which comprises the following steps:
(1) mixing steel slag particles, acid solution capable of dissolving aluminum and iron elements in the steel slag, stirring persulfate under a heating condition, adjusting the pH of a reaction solution to be alkaline, and standing to obtain an upper-layer flocculent turbid solution and a lower-layer residue; then separating out the flocculent turbid liquid and the residue for later use;
(2) stirring and washing the flocculent turbid liquid obtained in the step (1) by using water, then dropwise adding amino modified polydimethylsiloxane into the flocculent turbid liquid for reaction, heating the flocculent turbid liquid in the dropwise adding process, separating a solid product after the reaction is finished, drying the solid product and grinding the dried solid product to obtain superfine filling powder for later use;
(3) washing the residue obtained in the step (1), steaming under a pressure heating condition, and continuously carbonizing the residue under a carbon dioxide atmosphere and a heating condition to obtain porous residue for later use;
(4) and filling the superfine filling powder into the pores of the porous residues by adopting a vacuum filtration method, adding ettringite, cement and water for mixing, and drying the obtained particles to obtain the steel slag-based explosion suppression material.
Further, in the step (1), the steel slag particles and the persulfate are added in a proportion of 40-70 parts by weight: 0.5-1 weight part.
Optionally, the acid solution is a hydrochloric acid solution, and the mass concentration of the acid solution is 20-40%. The addition amount of the acid solution can dissolve aluminum and iron elements in the steel slag particles.
Alternatively, the persulfate includes any one of ammonium persulfate, sodium persulfate, potassium persulfate, and the like. Under the oxidation action of ammonium persulfate, ferrous ions dissolved from steel slag by hydrochloric acid are converted into ferric ions, so that hydroxide microcrystal floccules of salt can be formed conveniently.
Further, in the step (1), the alkalinity is 8.5-9.5, and optionally, ammonia water, sodium hydroxide, potassium hydroxide and the like are used for adjusting the pH value, so that dissolved aluminum ions and iron ions can be precipitated by adjusting the pH value with the three substances, and no new impurities are introduced.
Further, in the step (1), the heating conditions are as follows: stirring at 50-60 deg.C for 1-1.5 h. The reaction under the low-temperature heating condition is more beneficial to the rapid dissolution of aluminum and iron elements in the steel slag particles.
Furthermore, in the step (1), the obtained residue may be extracted for a plurality of times (preferably 3 to 5 times), and the method is the same as the step (1) of treating the steel slag particles, so as to further dissolve out aluminum and iron elements in the residue and fully utilize the steel slag.
In step (2), the addition amount of the amino-modified polydimethylsiloxane is as follows: steel slag particles: 40-70 parts of amino modified polydimethylsiloxane: 0.5-2 parts by weight.
Further, in the step (2), the heating temperature is 30-55 ℃, and the reaction time is 7-9 h.
Further, in the step (2), the particle size of the superfine filling powder is more than 300 meshes.
Further, in the step (3), the steam curing under the pressure heating condition is as follows: steaming at 200 deg.C and 1.2-1.6MPa for 9-12 h.
Further, in the step (3), the carbonization conditions under the carbon dioxide atmosphere and the heating condition are as follows: carbonizing for 2.5-4h under the conditions of 2-3MPa, carbon dioxide concentration not lower than 80% and 30-55 ℃; through the actions of pressure steaming and carbonization, a large amount of calcium hydroxide, magnesium hydroxide, calcium carbonate and magnesium carbonate are attached to the surface layer of the porous residue particles, and can be decomposed into water vapor or carbon dioxide after being heated, so that the explosion is stopped.
In step (4), the addition amounts of ettringite, cement and water are as follows: ettringite: cement: water: 100 portions of steel slag particles: 10-15 parts by weight: 3-10 parts by weight: 40-70 parts by weight.
Further, in the step (4), the drying method comprises the following steps: placing the obtained granules on a screen mesh, and introducing hot air of 45-65 ℃ from the lower part for drying to obtain the product.
Secondly, the invention discloses the steel slag-based explosion suppression material for suppressing coal dust explosion, which is obtained by the preparation method.
Further, the steel slag-based explosion suppression material has the following structure: the superfine filling powder is filled and wrapped in the pores of the porous residue particles, and the wrapping layer consisting of the ettringite and the cement hardened body wraps the porous residue particles filled and wrapped with the superfine filling powder, so that the core-shell type steel slag-based explosion suppression material with a double-shell structure is formed, and can be highly matched with an explosion mechanism and a course in an explosion suppression process.
Finally, the invention discloses application of the steel slag-based explosion suppression material for suppressing coal dust explosion in the mining field.
The explosion suppression material prepared by the invention has the following characteristics: when the explosion flame meets the explosion suppression material, the wrapping layer consisting of the ettringite and the cement hardened body firstly plays a role: the ettringite containing 32 crystal water absorbs heat and decomposes a large amount of crystal water at 75 ℃, the crystal water continuously absorbs heat and evaporates into water vapor, the process absorbs heat to rapidly reduce the flame temperature of the coal dust explosion precursor to be below the lowest ignition temperature, and simultaneously, the water vapor enables the coal dust to agglomerate to reduce the concentration of combustible substances, so that the explosion cannot be continuously propagated.
The preparation method of the explosion suppression material has the following two characteristics: the superfine filling powder is an organic-inorganic hybrid formed by compounding ferric hydroxide, aluminum hydroxide microcrystal and amino modified polydimethylsiloxane. When the coating layer cracks and falls off, the iron hydroxide and aluminum hydroxide microcrystal absorbs heat at about 150 ℃ to decompose free water, the free water is instantly changed into water vapor, and the coal dust is agglomerated again to reduce the concentration of combustible materials. And the siloxane in the amino modified polydimethylsiloxane contains a silicon-oxygen bond, and the amino and the siloxane can be quickly attached to the surface layer of the coal dust, so that the heat insulation and oxygen isolation are realized, the combustion reaction chain is interrupted, and the further development of explosion is prevented.
The explosion suppression material prepared by the invention has the third characteristic that: the porous residue particles are adhered with a large amount of calcium hydroxide, magnesium hydroxide, calcium carbonate and magnesium carbonate on the surface layer thereof through the actions of pressure steaming and carbonization. Wherein: calcium hydroxide and magnesium hydroxide can be dehydrated to produce a large amount of water vapor at the temperature of 350-450 ℃, and the coal dust is agglomerated again to reduce the concentration of combustible materials to the lower explosion limit of the coal dust, so that the explosion is stopped; and the calcium carbonate and the magnesium carbonate are thermally decomposed at the temperature of 600-700 ℃, carbon dioxide gas is released, the oxygen concentration in the air is diluted, and the combustion reaction chain is interrupted.
The fourth characteristic of the explosion suppression material prepared by the invention is that: because of the decomposition of calcium hydroxide, magnesium hydroxide, calcium carbonate and magnesium carbonate, special micropores and gaps are formed in the porous residue particles, active free radicals OH and H necessary for maintaining combustion enter and lose reaction activity due to the cold wall effect, so that the flame propagating through the particles is quenched, the explosion reaction chain is interrupted, and the explosion development is further inhibited.
Compared with the prior art, the invention has the following beneficial effects:
(1) the solid waste steel slag is used as a basic raw material, on one hand, a vitreous body structure of the steel slag is decomposed and active ions are increased under the erosion action of hydrochloric acid, on the other hand, part of iron simple substance is converted into ferrous salt and further converted into ferric salt under the oxidation action of ammonium persulfate, and then a large amount of hydroxide microcrystal floccules of the ferric salt and the aluminum salt are generated under an alkaline environment; the method effectively utilizes the steel slag waste, changes waste into valuable, and has simple whole preparation process and low cost.
(2) The explosion suppression material prepared by the invention has the explosion suppression effect which is highly matched with the explosion mechanism and the course, thereby forming an excellent explosion suppression effect.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described above, some existing explosion suppression materials have an explosion suppression effect that is not matched with the explosion mechanism and course, thereby causing poor explosion suppression effect. Therefore, the invention provides a steel slag-based explosion suppression material for suppressing coal dust explosion and a preparation method thereof; the invention will now be further described with reference to specific embodiments.
Example 1
A preparation method of a steel slag-based explosion suppression material for suppressing coal dust explosion comprises the following steps:
(1) adding 40 parts by weight of steel slag particles, 3 parts by weight of hydrochloric acid solution with the mass concentration of 20% and 0.5 part by weight of ammonium persulfate serving as oxidants into a four-neck flask, stirring at 50 ℃ for 1 hour, adjusting the pH value to 9.0 by adopting ammonia water with the mass concentration of 10%, standing for 10 minutes, and separating upper-layer flocculent turbid liquid and lower-layer residues;
the obtained residue is extracted for a plurality of times: adding the residue, 3 parts by weight of hydrochloric acid solution with the mass concentration of 20% and 0.5 part by weight of ammonium persulfate into the four-neck flask again, stirring for 1 hour at 50 ℃, standing for 10 minutes, separating, repeating for 3 times, combining flocculent turbid liquids obtained by multiple extractions, and combining the residues obtained by multiple extractions for later use;
(2) and (2) stirring and washing the flocculent turbid liquid obtained in the step (1) by using distilled water, then transferring the flocculent turbid liquid into a four-neck flask, dropwise adding 0.5 part by weight of amino modified polydimethylsiloxane, reacting for 8 hours at the temperature of 30 ℃, filtering out a solid product, drying, and grinding to more than 300 meshes to obtain the superfine filling powder.
(3) Washing the residue obtained in the step (1) with distilled water, then steaming at 150 ℃ and 1.2MPa for 12 hours, and then carbonizing at 2MPa, 85% carbon dioxide concentration and 30 ℃ for 4 hours to obtain porous residue.
(4) Filling superfine filling powder into a porous residue pore by adopting a vacuum filtration method, then adding 100 parts by weight of ettringite, 10 parts by weight of cement and 3 parts by weight of water to mix slurry, stirring for 2 minutes, placing particles on a screen, and introducing 45 ℃ hot air from the lower part for drying to obtain the steel slag-based explosion suppression material.
Example 2
A preparation method of a steel slag-based explosion suppression material for suppressing coal dust explosion comprises the following steps:
(1) 70 parts by weight of steel slag particles, 10 parts by weight of hydrochloric acid solution with the mass concentration of 40% and 1 part by weight of ammonium persulfate as oxidants are added into a four-neck flask, stirred at 60 ℃ for 1.5 hours, adjusted to the pH value of 9.5 by using 1mol/L sodium hydroxide, stood for 20 minutes, and separated into an upper layer flocculent turbid liquid and a lower layer residue.
The obtained residue is extracted for a plurality of times: adding the residue, 10 parts by weight of hydrochloric acid solution with the mass concentration of 40% and 1 part by weight of ammonium persulfate into the four-neck flask again, stirring for 1.5 hours at 60 ℃, standing for 10 minutes, separating, repeating for 5 times, combining flocculent turbid liquids obtained by multiple extractions, and combining residues obtained by multiple extractions for later use;
(2) and (2) stirring and washing the flocculent turbid liquid obtained in the step (1) by using distilled water, transferring the flocculent turbid liquid into a four-neck flask, dropwise adding 2 parts by weight of amino modified polydimethylsiloxane (dropwise adding is completed within about 0.5 h), reacting for 7h at the temperature of 55 ℃, filtering out a solid product, drying, and grinding to more than 300 meshes to obtain the superfine filling powder.
(3) Washing the residue obtained in the step (1) with distilled water, then steaming at 200 ℃ and 1.6MPa for 9 hours, and then carbonizing at 3MPa, 80% carbon dioxide concentration and 55 ℃ for 2.5 hours to obtain a porous residue.
(4) Filling superfine filling powder into a porous residue hole by adopting a vacuum filtration method, then adding 120 parts by weight of ettringite, 15 parts by weight of cement and 10 parts by weight of water to mix slurry, stirring for 5 minutes, placing particles on a screen, and introducing 65 ℃ hot air from the lower part for drying to obtain the steel slag-based explosion suppression material.
Example 3
A preparation method of a steel slag-based explosion suppression material for suppressing coal dust explosion comprises the following steps:
(1) 50 parts by weight of steel slag particles, 8 parts by weight of a hydrochloric acid solution having a mass concentration of 30% and 0.8 part by weight of sodium persulfate as an oxidizing agent were put into a four-necked flask, stirred at 55 ℃ for 1.5 hours, adjusted to pH 8.5 with aqueous ammonia having a mass concentration of 10%, allowed to stand for 15 minutes, and separated into an upper layer flocculated liquid and a lower layer residue.
The obtained residue is extracted for a plurality of times: adding the residues, 8 parts by weight of a hydrochloric acid solution with the mass concentration of 30% and 0.8 part by weight of ammonium persulfate into the four-neck flask again, stirring for 1.5 hours at 55 ℃, standing for 10 minutes, separating, repeating for 5 times, combining flocculent turbid liquids obtained by multiple extractions, and combining the residues obtained by multiple extractions for later use;
(2) and (2) stirring and washing the flocculent turbid liquid obtained in the step (1) by using distilled water, transferring the flocculent turbid liquid into a four-neck flask, dropwise adding 1.5 parts by weight of amino modified polydimethylsiloxane (dropwise adding is finished within about 0.5 h), reacting for 10h at the temperature of 40 ℃, filtering, drying, and grinding to be more than 300 meshes to obtain the superfine filling powder.
(3) Washing the residue obtained in the step (1) with distilled water, then steaming at 180 ℃ and 1.5MPa for 10 hours, and then carbonizing at 3MPa, 90% carbon dioxide concentration and 45 ℃ for 3 hours to obtain porous residue.
(4) Filling superfine filling powder into a porous residue hole by adopting a vacuum filtration method, then adding 110 parts by weight of ettringite, 13 parts by weight of cement and 5 parts by weight of water to mix slurry, stirring for 5 minutes, placing particles on a screen, and then introducing 55 ℃ hot air from the lower part for drying to obtain the steel slag-based explosion suppression material.
Performance testing：
The red mud-based powder explosion suppression material prepared by the method disclosed in patent document with application number 201810692866.1 is used as a comparison; the explosion suppression performance of the red mud-based powder explosion suppression material and the explosion suppression materials prepared in examples 1-3 was tested, wherein the data of the red mud-based powder explosion suppression material was collected from the above patent documents, and the test results are shown in table 1.
TABLE 1
| Absorbed heat (kJ/kg) | Flame propagation velocity (m/s) | Maximum explosion pressure (mbar) | |
| Example 1 | 1395 | 36 | 72.1 |
| Example 2 | 1372 | 38 | 70.6 |
| Example 3 | 1436 | 32 | 74.4 |
| Comparative example | 985 | 60 | 89.8 |
The detection data in table 1 show that the explosion suppression material prepared by the invention has high heat absorption amount, small maximum explosion pressure and low flame propagation rate in the explosion process, so that the explosion suppression material has good explosion suppression performance and strong adsorption capacity to explosion, and the core-shell type steel slag-based explosion suppression material with the double-shell structure has higher matching degree with the explosion mechanism and course, thereby forming excellent explosion suppression effect.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A preparation method of a steel slag-based explosion suppression material for suppressing coal dust explosion is characterized by comprising the following steps:
(1) mixing steel slag particles, acid solution capable of dissolving aluminum and iron elements in the steel slag, stirring persulfate under a heating condition, adjusting the pH of a reaction solution to be alkaline, and standing to obtain an upper-layer flocculent turbid solution and a lower-layer residue; then separating out the flocculent turbid liquid and the residue for later use;
(2) stirring and washing the flocculent turbid liquid obtained in the step (1) by using water, then dropwise adding amino modified polydimethylsiloxane into the flocculent turbid liquid for reaction, heating the flocculent turbid liquid in the dropwise adding process, separating a solid product after the reaction is finished, drying the solid product and grinding the dried solid product to obtain superfine filling powder for later use;
(3) washing the residue obtained in the step (1), steaming under a pressure heating condition, and continuously carbonizing the residue under a carbon dioxide atmosphere and a heating condition to obtain porous residue for later use;
(4) and filling the superfine filling powder into the pores of the porous residues by adopting a vacuum filtration method, adding ettringite, cement and water for mixing, and drying the obtained particles to obtain the steel slag-based explosion suppression material.
2. The preparation method of the steel slag-based explosion suppression material for suppressing coal dust explosion as claimed in claim 1, wherein in the step (1), the addition ratio of the steel slag particles to the persulfate is 40-70 parts by weight: 0.5-1 weight part;
preferably, the acid solution is a hydrochloric acid solution, and the mass concentration of the acid solution is 20-40%;
preferably, the persulfate includes any one of ammonium persulfate, sodium persulfate, and potassium persulfate.
3. The method for preparing a steel slag-based explosion suppression material for suppressing coal dust explosion according to claim 1, wherein in the step (1), the alkalinity is 8.5-9.5, and preferably, ammonia water, sodium hydroxide or potassium hydroxide is used for adjusting the pH value.
4. The method for preparing a steel slag-based explosion suppression material for suppressing coal dust explosion according to claim 1, wherein in the step (1), the heating conditions are as follows: stirring at 50-60 deg.C for 1-1.5 h;
or, in the step (2), the heating temperature is 30-55 ℃, and the reaction time is 7-9 h;
or in the step (2), the particle size of the superfine filling powder is more than 300 meshes.
5. The method for preparing a steel slag-based explosion suppression material for suppressing coal dust explosion according to claim 1, wherein in the step (3), the carbonization conditions under carbon dioxide atmosphere and heating condition are as follows: carbonizing for 2.5-4h under the conditions of 2-3MPa, carbon dioxide concentration not lower than 80% and 30-55 ℃.
6. The method for preparing the steel slag-based explosion suppression material for suppressing coal dust explosion according to claim 1, wherein in the step (2), the addition amount of the amino modified polydimethylsiloxane is as follows: steel slag particles: 40-70 parts of amino modified polydimethylsiloxane: 0.5-2 parts by weight;
or, in the step (3), the steam curing under the pressure heating condition is carried out under the following conditions: steaming at 150-;
or in the step (4), the addition amounts of the ettringite, the cement and the water are as follows: ettringite: cement: water: 100 portions of steel slag particles: 10-15 parts by weight: 3-10 parts by weight: 40-70 parts by weight.
7. The method for preparing the steel slag-based explosion suppression material for suppressing coal dust explosion according to claim 1, wherein in the step (4), the drying method comprises the following steps: placing the obtained granules on a screen mesh, and introducing hot air of 45-65 ℃ from the lower part for drying to obtain the product.
8. The method for preparing a steel slag-based explosion suppression material for suppressing the explosion of coal dust according to any one of claims 1 to 7, wherein in the step (1), the obtained residue is extracted for a plurality of times in the same way as the step (1) of treating the steel slag particles; preferably 3-5 times.
9. A steel slag-based explosion suppression material for suppressing coal dust explosion, which is obtained by the production method according to any one of claims 1 to 8; preferably, the steel slag-based explosion suppression material has the structure as follows: the coating layer composed of ettringite and cement hardened body coats the hole residue particles filled and coated with superfine filling powder in the coating layer to form the core-shell steel slag-based explosion suppression material with a double-shell structure.
10. Use of the steel slag-based explosion suppression material for suppressing coal dust explosion according to claim 9 in the mining field.
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| CN109882233A (en) * | 2019-03-07 | 2019-06-14 | 山东科技大学 | A kind of superfine powder composition and preparation method thereof inhibiting coal-dust explosion |
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| DE2408410A1 (en) * | 1973-02-23 | 1974-08-29 | Calcium Products Corp | LIMESTONE CORES AND THE PROCESS FOR THEIR PRODUCTION |
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| CN114738039B (en) * | 2022-04-19 | 2023-06-23 | 常州大学 | Preparation method of polydopamine coated mixed powder modified explosion suppression material |
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