CN113880443A - Method for preparing high-strength-toughness heat-preservation rock wool board by using nickel smelting furnace slag - Google Patents
Method for preparing high-strength-toughness heat-preservation rock wool board by using nickel smelting furnace slag Download PDFInfo
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- CN113880443A CN113880443A CN202111124740.2A CN202111124740A CN113880443A CN 113880443 A CN113880443 A CN 113880443A CN 202111124740 A CN202111124740 A CN 202111124740A CN 113880443 A CN113880443 A CN 113880443A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000011490 mineral wool Substances 0.000 title claims abstract description 69
- 238000003723 Smelting Methods 0.000 title claims abstract description 63
- 239000002893 slag Substances 0.000 title claims abstract description 47
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004321 preservation Methods 0.000 title claims abstract description 27
- 239000002699 waste material Substances 0.000 claims abstract description 20
- 239000002028 Biomass Substances 0.000 claims abstract description 19
- 239000010459 dolomite Substances 0.000 claims abstract description 14
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 14
- 239000002657 fibrous material Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 12
- 238000000197 pyrolysis Methods 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 11
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 230000002940 repellent Effects 0.000 claims abstract description 9
- 239000005871 repellent Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 5
- 239000011347 resin Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 3
- 150000001343 alkyl silanes Chemical class 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- XPBBUZJBQWWFFJ-UHFFFAOYSA-N fluorosilane Chemical compound [SiH3]F XPBBUZJBQWWFFJ-UHFFFAOYSA-N 0.000 claims description 3
- 210000003608 fece Anatomy 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 244000144972 livestock Species 0.000 claims description 2
- 239000010871 livestock manure Substances 0.000 claims description 2
- 244000144977 poultry Species 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 238000001723 curing Methods 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 7
- -1 basalt Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- PAQJKNISGWCENE-UHFFFAOYSA-N trimethyl octadecyl silicate Chemical compound CCCCCCCCCCCCCCCCCCO[Si](OC)(OC)OC PAQJKNISGWCENE-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
- C03C25/14—Spraying
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
- C03C25/32—Macromolecular compounds or prepolymers obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C03C25/34—Condensation polymers of aldehydes, e.g. with phenols, ureas, melamines, amides or amines
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/40—Organo-silicon compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of solid waste resource utilization, and discloses a method for preparing a high-strength and high-toughness heat-preservation rock wool board by using nickel smelting furnace slag. Adding nickel smelting furnace slag, dolomite and biomass waste particles into a tempering furnace, heating to 850-1250 ℃ under an anaerobic condition, carrying out smelting and high-temperature pyrolysis treatment, centrifuging the obtained melt into a fibrous shape, spraying a water repellent and a resin adhesive in the centrifuging process, collecting fiber materials, extruding, folding and overlapping by using a folding machine to form a three-dimensional loose rock wool layer, pressing the obtained rock wool layer, then sending the obtained rock wool layer into a curing furnace for curing, slicing and cooling to obtain the high-strength and high-toughness heat-preservation rock wool board. According to the invention, the biomass waste and the nickel smelting furnace slag material are subjected to high-temperature smelting and high-temperature pyrolysis treatment in the tempering furnace, so that the strength and toughness of the obtained rock wool board can be obviously improved, and the heat conductivity coefficient of the rock wool board is reduced. Obtains good synergistic effect and has good economic benefit and environmental protection benefit.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for preparing a high-strength and high-toughness heat-preservation rock wool board by using nickel smelting furnace slag.
Background
The rock wool product is produced with high quality basalt, dolomite and other material as main material, and through high temperature melting, high speed centrifuging to form fiber, spraying certain amount of functional assistant, such as adhesive, dustproof oil, water repellent, etc. and collecting in cotton collecting machine, pendulum process, three-dimensional spreading, curing and cutting.
However, as the mining amount of natural stone such as basalt, dolomite, etc. is excessively increased, the source thereof is gradually limited, and particularly, in european countries, the mining of natural stone has been prohibited. Therefore, there is a need to find a substitute for natural stone for the production of rock wool products with properties meeting the requirements of the application.
The nickel smelting slag contains a large amount of silicon dioxide and metal oxides (such as SiO)2、MgO、CaO、FeO、Al2O3) And the like. At present, the nickel smelting furnace slag is generally treated by adopting a stockpiling method, is not fully utilized, occupies a large area, seriously pollutes the surrounding environment and wastes a large amount of resources. If the nickel smelting furnace slag can be treated and reused, the environment can be improved, a large amount of resources can be saved, and the economic benefit can be improved.
Patent CN 108975717A discloses a method for recycling nickel smelting slag, which comprises the following steps: (1) smelting 20-40% of dolomite and 8-15% of coke in nickel smelting slag in a quenching and tempering furnace; (2) separating iron produced by smelting, and cooling and casting ingots; (3) and (3) feeding the melt after iron separation into a multi-roller centrifuge for drawing into rock wool fibers. And (3) pleating, solidifying, slicing and cooling the rock wool fibers to obtain rock wool products. The patented technology realizes the preparation of rock wool products from the nickel smelting furnace slag and recovers the useful iron elements. However, subsequent researches show that the rock wool product obtained by the method has further improved strength, toughness and heat-insulating property.
Patent CN 106639011A discloses a high waterproof heat preservation rock wool board, which is prepared from the following raw materials in parts by weight: 55-65 parts of iron ore, 10-15 parts of perlite, 12-16 parts of slag, 10-13 parts of glass, 6-8 parts of water repellent, 5-6 parts of urea, 8-10 parts of phenolic resin, 1-2 parts of 3-aminopropyltriethoxysilane and 3-5 parts of vinyl t-butyl-tri-peroxide silane. The formula of the rock wool board can ensure that the proportion of magnesium, calcium and iron elements in the rock wool board reaches triangular balance, and the rock wool fiber with high quality is obtained. However, the method needs a large amount of natural iron ore and has higher cost.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide a method for preparing a high-strength and high-toughness heat-preservation rock wool board by using nickel smelting furnace slag.
The invention also aims to provide the high-strength and high-toughness heat-preservation rock wool board prepared by the method.
The purpose of the invention is realized by the following technical scheme:
a method for preparing a high-strength and high-toughness heat-preservation rock wool board by using nickel smelting furnace slag comprises the following preparation steps:
(1) adding nickel smelting furnace slag, dolomite and biomass waste particles into a tempering furnace, heating to 850-1250 ℃ under an oxygen-free condition, and carrying out smelting and high-temperature pyrolysis treatment;
(2) centrifuging the melt obtained in the step (1) into fibers, and spraying a water repellent and a resin adhesive in the centrifuging process;
(3) collecting the fiber materials in the step (2), and extruding, folding and superposing the fiber materials by using a folding machine to form a three-dimensional loose rock wool layer;
(4) and (4) pressing the rock wool layer obtained in the step (3), then sending the rock wool layer into a curing furnace for curing, slicing and cooling to obtain the high-strength and high-toughness heat-preservation rock wool board.
Further, the nickel smelting slag in the step (1) comprises 3-9% of main chemical components and SiO in percentage by weight242%~55%、MgO 3%~16%、CaO 5%~25%、Al2O32%~8%。
Further, the mass ratio of the nickel smelting furnace slag, the dolomite and the biomass waste particles added in the step (1) is 1 (0.2-0.4) to (0.5-1).
Further, the biomass waste in the step (1) comprises at least one of farmland straws, shells, sawdust, branches, dehydrated livestock and poultry manure and dehydrated sludge, and the particle size of biomass waste particles is 0.01-2 mm.
Further preferably, the biomass waste in step (1) is selected from dewatered sludge. The carbon, nitrogen and metal elements contained in the dewatered sludge are beneficial to improving the melt structure of the nickel smelting furnace slag, and the strength, toughness and heat preservation performance of the obtained rock wool fiber are obviously enhanced.
Further, the water repellent in the step (2) refers to at least one of an alkyl silane coupling agent and a fluorosilane coupling agent.
Further, in the step (2), the resin binder is a phenolic resin binder or a urea resin binder.
A high-strength and high-toughness heat-insulation rock wool board is prepared by the method.
The principle of the invention is as follows: the nickel smelting furnace slag, the dolomite and the biomass waste particles are subjected to high-temperature smelting and high-temperature pyrolysis treatment in a tempering furnace simultaneously, so that on one hand, the reduction effect generated by the high-temperature pyrolysis of the biomass waste improves the ratio of metal oxide to metal components in a melt, and the rock wool fiber obtained after centrifugation has higher strength and better toughness; on the other hand, the residual high-temperature carbonization products such as porous carbon powder and the like after the biomass waste is subjected to high-temperature pyrolysis can reduce the heat conductivity coefficient of the rock wool fiber to a certain extent, and have better heat preservation performance.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method can simultaneously realize the treatment and the full reutilization of the nickel smelting furnace slag and the biomass waste, overcomes the defects of the prior art of nickel smelting furnace slag stockpiling treatment and biomass waste stockpiling treatment or incineration treatment, and generates good economic benefit and environmental protection benefit.
(2) According to the invention, the nickel smelting furnace slag, the dolomite and the biomass waste particles are subjected to high-temperature smelting and high-temperature pyrolysis treatment in the tempering furnace at the same time, and the strength, the toughness and the heat preservation performance of the rock wool board can be obviously improved through verification.
(3) The preparation method of the invention utilizes the iron element in the nickel smelting slag to achieve the balance of the proportion of magnesium, calcium and iron elements, and obtains the rock wool fiber with high quality.
(4) According to the preparation method, the alkyl silane coupling agent or the fluorosilane coupling agent is used as the water repellent, the combination of the water repellent and the rock wool fiber is firm, and the alkyl polysiloxane film or the fluorine-containing polysiloxane film formed after condensation has excellent waterproof performance.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting furnace slag comprises the following specific preparation steps:
(1) nickel smelting slag (smelting slag of certain nickel smelting plant in China, which contains 7.92 percent of FeO and SiO)254.31%、MgO 9.78%、CaO 13.20%、Al2O33.08 percent), dolomite aggregate and dewatered sludge (the dewatered activated sludge of a certain domestic sewage treatment plant is crushed and has the grain diameter of about 0.1 mm) are added into a tempering furnace according to the mass ratio of 1:0.2:0.5, and the temperature is raised to 1200-1250 ℃ under the anaerobic condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers, and spraying octadecyl trimethoxy silanol solution and phenolic resin adhesive in the centrifuging process;
(3) collecting the fiber materials in the step (2), and extruding, folding and superposing the fiber materials by using a folding machine to form a three-dimensional loose rock wool layer;
(4) and (4) pressing the rock wool layer obtained in the step (3), then sending the rock wool layer into a curing furnace for curing, slicing and cooling to obtain the high-strength and high-toughness heat-preservation rock wool board.
Example 2
The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting furnace slag comprises the following specific preparation steps:
(1) nickel smelting slag (smelting slag of certain nickel smelting plant in China, which contains 7.92 percent of FeO and SiO)254.31%、MgO 9.78%、CaO 13.20%、Al2O33.08 percent), dolomite granules and dehydrated sludge (dehydrated activated sludge of a sewage treatment plant in China, warp-knitted fabricThe particle size after crushing is about 0.1 mm) is added into a tempering furnace according to the mass ratio of 1:0.3:0.7, and the temperature is raised to 1200-1250 ℃ under the anaerobic condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers, and spraying octadecyl trimethoxy silanol solution and phenolic resin adhesive in the centrifuging process;
(3) collecting the fiber materials in the step (2), and extruding, folding and superposing the fiber materials by using a folding machine to form a three-dimensional loose rock wool layer;
(4) and (4) pressing the rock wool layer obtained in the step (3), then sending the rock wool layer into a curing furnace for curing, slicing and cooling to obtain the high-strength and high-toughness heat-preservation rock wool board.
Example 3
The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting furnace slag comprises the following specific preparation steps:
(1) nickel smelting slag (smelting slag of certain nickel smelting plant in China, which contains 7.92 percent of FeO and SiO)254.31%、MgO 9.78%、CaO 13.20%、Al2O33.08 percent), dolomite aggregate and dewatered sludge (the dewatered activated sludge of a certain domestic sewage treatment plant is crushed and has the grain diameter of about 0.1 mm) are added into a tempering furnace according to the mass ratio of 1:0.4:1, and the temperature is raised to 1200-1250 ℃ under the anaerobic condition for smelting and high-temperature pyrolysis treatment.
(2) Centrifuging the melt obtained in the step (1) into fibers, and spraying perfluorodecyl trimethoxy silanol solution and urea resin adhesive in the centrifuging process;
(3) collecting the fiber materials in the step (2), and extruding, folding and superposing the fiber materials by using a folding machine to form a three-dimensional loose rock wool layer;
(4) and (4) pressing the rock wool layer obtained in the step (3), then sending the rock wool layer into a curing furnace for curing, slicing and cooling to obtain the high-strength and high-toughness heat-preservation rock wool board.
Comparative example 1
Compared with the example 2, the comparative example has the following specific preparation steps without adding dehydrated sludge:
(1) nickel smelting slag (smelting slag of certain nickel smelting plant in China, which contains 7.92 percent of FeO and SiO)254.31%、MgO 9.78%、CaO 13.20%、Al2O33.08%) and dolomite granules according to the mass ratio of 1:0.3, and heating to 1200-1250 ℃ under an oxygen-free condition for smelting.
(2) Centrifuging the melt obtained in the step (1) into fibers, and spraying octadecyl trimethoxy silanol solution and phenolic resin adhesive in the centrifuging process;
(3) collecting the fiber materials in the step (2), and extruding, folding and superposing the fiber materials by using a folding machine to form a three-dimensional loose rock wool layer;
(4) and (4) pressing the rock wool layer obtained in the step (3), then sending the rock wool layer into a curing furnace for curing, slicing and cooling to obtain the rock wool board.
The rock wool boards obtained in the above examples and comparative examples were subjected to performance tests, the test items including tensile strength (TR15), compressive strength (thickness 50mm, 10% deformation) and thermal conductivity, the test standards being GB/T25975-2018, and the test results being shown in Table 1 below.
TABLE 1
As can be seen from the results in Table 1, the dehydrated sludge and the nickel smelting slag material are subjected to high-temperature smelting and high-temperature pyrolysis treatment in the tempering furnace simultaneously, so that the strength and toughness of the rock wool board can be obviously improved, and the heat conductivity coefficient of the rock wool board can be reduced. Obtains good synergistic effect, realizes the recycling of the nickel smelting furnace slag and the biomass waste, reduces the environmental pollution, and generates good economic benefit and environmental protection benefit.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A method for preparing a high-strength and high-toughness heat-insulation rock wool board by using nickel smelting furnace slag is characterized by comprising the following preparation steps:
(1) adding nickel smelting furnace slag, dolomite and biomass waste particles into a tempering furnace, heating to 850-1250 ℃ under an oxygen-free condition, and carrying out smelting and high-temperature pyrolysis treatment;
(2) centrifuging the melt obtained in the step (1) into fibers, and spraying a water repellent and a resin adhesive in the centrifuging process;
(3) collecting the fiber materials in the step (2), and extruding, folding and superposing the fiber materials by using a folding machine to form a three-dimensional loose rock wool layer;
(4) and (4) pressing the rock wool layer obtained in the step (3), then sending the rock wool layer into a curing furnace for curing, slicing and cooling to obtain the high-strength and high-toughness heat-preservation rock wool board.
2. The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting slag as claimed in claim 1, wherein the method comprises the following steps: the nickel smelting slag in the step (1) comprises 3-9% of main chemical components and SiO in percentage by weight242%~55%、MgO 3%~16%、CaO 5%~25%、Al2O32%~8%。
3. The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting slag as claimed in claim 1, wherein the method comprises the following steps: in the step (1), the mass ratio of the nickel smelting furnace slag, dolomite and biomass waste particles is 1 (0.2-0.4) to 0.5-1.
4. The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting slag as claimed in claim 1, wherein the method comprises the following steps: the biomass waste in the step (1) comprises at least one of farmland straws, shells, sawdust, branches, dehydrated livestock and poultry manure and dehydrated sludge, and the particle size of biomass waste particles is 0.01-2 mm.
5. The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting slag as claimed in claim 4, wherein the method comprises the following steps: the biomass waste is selected from dewatered sludge.
6. The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting slag as claimed in claim 1, wherein the method comprises the following steps: the water repellent in the step (2) refers to at least one of an alkyl silane coupling agent and a fluorosilane coupling agent.
7. The method for preparing the high-strength and high-toughness heat-preservation rock wool board by using the nickel smelting slag as claimed in claim 1, wherein the method comprises the following steps: in the step (2), the resin adhesive is a phenolic resin adhesive or a urea resin adhesive.
8. The utility model provides a tough heat preservation rock wool board of high, which characterized in that: prepared by the method of any one of claims 1 to 7.
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