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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- rock wool
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- slag
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Classifications
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- 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
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- 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
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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