CN115140943A - Method for producing rock wool by utilizing solid wastes of iron and steel plant - Google Patents
Method for producing rock wool by utilizing solid wastes of iron and steel plant Download PDFInfo
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- CN115140943A CN115140943A CN202210770449.0A CN202210770449A CN115140943A CN 115140943 A CN115140943 A CN 115140943A CN 202210770449 A CN202210770449 A CN 202210770449A CN 115140943 A CN115140943 A CN 115140943A
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- rock wool
- potassium titanate
- raw material
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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
-
- 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
- C03B37/005—Manufacture of flakes
Abstract
The invention discloses a method for producing rock wool by utilizing solid wastes of a steel plant, which comprises the following steps: weighing solid wastes of a steel plant, quartz sand, bauxite powder and coke, and adding modified potassium titanate whiskers to obtain a raw material mixture; melting the raw material mixture into magma; throwing the magma into fine magma; cooling to obtain rock wool fibers; spraying the adhesive and other auxiliary agents on the rock wool fibers; forming a rock wool felt and pressing and forming; solidifying and cutting to obtain the rock wool board. The specific modified potassium titanate whisker plays a key role in improving the mechanical property of the rock wool, particularly the tensile strength and the compressive strength of the rock wool.
Description
Technical Field
The invention belongs to the technical field of inorganic fiber materials; relates to a method for producing rock wool by utilizing solid wastes of a steel plant.
Background
The rock wool is made up by using basalt or diabase as main raw material, adding a certain quantity of auxiliary material and making them pass through the processes of high-temp. melting and centrifugation. The rock wool board is made by adding proper amount of binder, water repellent and other additives into rock wool fiber and pressing and curing. Compared with organic heat-insulating materials, all metal oxides of the rock wool are stable oxides, and the fireproof performance reaches the A-level standard; the chemical components of the composite material are stable, can be synchronized with the life of the building; the production material is non-toxic, pollution-free and high in safety performance.
The rock wool has excellent fireproof performance and heat preservation performance, so that the rock wool can be widely applied to the heat preservation system of the outer wall in China, and related scholars develop related researches on the production method of the building heat preservation rock wool in order to reduce the cost and improve the product performance.
Chinese patent application CN101838104A discloses a method for producing rock wool, which comprises the following raw materials in percentage by weight: 60-80% of coal gangue, 15-25% of slag and 5-15% of auxiliary material, wherein the auxiliary material is one or more than two of fluorite, shale, kaolin or diatomite; firstly, crushing the coal gangue and the auxiliary material to a particle size of 5-30 mm; then the raw materials are weighed according to the proportion and mixed evenly, and are smelted to be molten at 1500-1800 ℃, and then the wire is spun. The invention opens up a new way for the comprehensive utilization of the coal gangue, can reduce the production energy consumption and save resources, and has excellent product performance.
Chinese patent application CN109399908A discloses an environment-friendly rock wool, which comprises the following components in percentage by weight: basalt: 50-60%, blast furnace slag: 8-20%, process waste: 8-20%, coke: 0 to 12 percent. According to the production method, the process waste materials generated in the production process of the rock wool are used as one of the manufacturing raw materials, so that the product quality is guaranteed, the production cost is reduced, meanwhile, the treatment of the process waste materials is omitted, in addition, the metal slag is collected and recycled in the production process, the energy is saved, the generated waste gas is filtered, the harm to the environment is reduced, and the prepared rock wool is good in quality, low in price and high in quality and has a wide application prospect.
The Chinese patent application CN104909554A discloses a hot-melt slag regenerated rock wool and a production method thereof, and the hot-melt slag regenerated rock wool is suitable for industrial equipment and materials for heat preservation and insulation of pipelines, thermal equipment, thermal pipelines, internal and external walls of buildings, heat preservation and insulation, sound insulation, noise prevention and the like. Hot slag with the temperature of 1400-1450 ℃ is obtained by adopting the waste heat of hot slag in an iron-making smelting furnace, enters a high-temperature resistance furnace through a hot slag channel, is added with a quartz sand material to adjust the acidity coefficient MK to 1.4-1.8, and the viscosity of the hot slag is adjusted; adding nitrogen gas to stir evenly to melt and homogenize various materials in the hot slag, enabling the prepared hot melt to flow into a high-speed centrifuge through a high-temperature-resistant sliding plate, carrying out high-speed centrifuge cotton throwing, carrying out slag removal treatment to prepare hot-melt slag regenerated rock wool, and automatically weighing, automatically compressing and packaging by an automatic packaging machine for forming.
However, the mechanical properties of rock wool obtained by the above-mentioned production methods, in particular the tensile strength and compressive strength of rock wool, are still unsatisfactory.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a rock wool production method with better mechanical properties, particularly better tensile strength and compressive strength.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for producing rock wool by utilizing solid wastes of a steel plant comprises the following steps:
1) Weighing solid wastes of a steel plant, quartz sand, bauxite powder and coke, ball-milling and crushing the four raw materials, adding modified potassium titanate whiskers, and uniformly mixing to obtain a raw material mixture;
2) Putting the raw material mixture into a cupola furnace, and simultaneously introducing preheated oxygen; melting the raw material mixture into magma at 1450-1500 deg.C;
3) The rock pulp is led into a four-roller centrifuge and thrown into fine rock pulp under the centrifugal action; the cotton throwing temperature is 1320-1400 ℃; cooling the fine rock slurry by using flowing air to obtain rock wool fibers with the average diameter of 5-7 mu m;
4) Uniformly spraying phenolic resin adhesive, polydimethylsiloxane and silane coupling agent KH-550 on the rock wool fibers;
5) The rock wool fiber is sunk and descended under the action of negative pressure suction to form a primary cotton belt; then the mixture is sent into a pendulum bob machine, forming a plurality of layers of folded uniform rock wool felts and pressing and forming;
6) And (3) feeding the rock wool felt into a curing furnace, introducing hot air at 200-260 ℃ for curing, and slitting to obtain the rock wool board.
The method of the invention comprises the following steps of mixing the solid waste of the steel plant, the quartz sand, the bauxite and the coke in a weight ratio of 56-61:14-17:10-14:12-16.
In a preferred embodiment, the weight ratio of steel plant solid waste, quartz sand, bauxite and coke is 58.5:15.5:12:14.
the method of the invention, wherein the addition amount of the modified potassium titanate whiskers is 0.5-1.1wt% of the four raw materials.
In a preferred embodiment, the addition amount of the modified potassium titanate whiskers is 0.8wt% of the four raw materials.
The method of the invention, wherein the modified potassium titanate whiskers are silica surface modified potassium titanate whiskers.
The method is characterized in that the modified potassium titanate whisker is obtained by heat preservation and aging of a potassium titanate whisker raw material and sodium silicate at the temperature of 70-90 ℃ and the pH = 8.0-10.0.
In a preferred embodiment, the modified potassium titanate whisker is obtained by aging a potassium titanate whisker raw material and sodium silicate at 80 ℃ and pH = 9.0.
The method of the invention is characterized in that the weight ratio of the potassium titanate whisker raw material to the sodium silicate is 100: (10-14).
In a preferred embodiment, the weight ratio of the potassium titanate whisker raw material to the sodium silicate is 100:12.
the method of the invention, wherein the potassium titanate whisker raw material has an average diameter of 0.5-1.0 μm and an average length of 20-50 μm.
In a preferred embodiment, the potassium titanate whisker raw material has an average diameter of 0.7 μm and an average length of 28 μm.
The method according to the invention, wherein the average chemical composition of the steel plant solid waste is: 38-43% of CaO; siO 2 2 17-22％；Fe 2 O 3 14-18％；Al 2 O 3 5-7％；MgO 4-6％；MnO 3-5％；TiO 2 1-2％；Cr 2 O 3 0.4-0.8％；V 2 O 5 0.3-0.7％；K 2 0.05 to 0.2 percent of O; the balance being ash.
In a preferred embodiment, the average chemical composition of the steel plant solid waste is: caO 40.46%; siO 2 2 19.23％；Fe 2 O 3 15.78％；Al 2 O 3 6.35％；MgO 5.18％；MnO 4.02％；TiO 2 1.37％；Cr 2 O 3 0.68％；V 2 O 5 0.49％；K 2 0.12 percent of O; the balance being ash.
The method according to the invention, wherein the average chemical composition of the bauxite ore fines is: al (Al) 2 O 3 53-60％；SiO 2 25-32％；TiO 2 3-5％；Fe 2 O 3 2-4％；CaO 1-2％；MgO 0.2-0.6％；MnO 0.15-0.35％；K 2 0 to 0.2 percent of O; the balance being ash.
In a preferred embodiment, the average chemical composition of the bauxite ore fines is: al (Al) 2 O 3 56.48％；SiO 2 28.32％；TiO 2 3.61％；Fe 2 O 3 2.92％；CaO 1.38％；MgO 0.38％；MnO 0.24％；K 2 0.08 percent of O; the balance being ash.
The method comprises the steps of adding 1-2wt%, 0.06-0.18wt% and 0.02-0.10wt% of phenolic resin adhesive, polydimethylsiloxane and silane coupling agent KH-550 based on the weight of rock wool fibers.
In a preferred embodiment, the phenolic resin binder, polydimethylsiloxane and silane coupling agent KH-550 are added in amounts of 1.5wt%, 0.12wt% and 0.06wt%, respectively, based on the weight of the rock wool fibers.
Without wishing to be bound by any theory, the specific modified potassium titanate whiskers of the present invention play a key role in improving the mechanical properties of rock wool, in particular the tensile strength and compressive strength of rock wool.
Detailed Description
It must be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include both one and more than one (i.e., two, including two) unless the context clearly dictates otherwise.
Unless otherwise indicated, the numerical ranges in this disclosure are approximate and, thus, may include values outside of the stated ranges. The numerical ranges may be stated herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the numerical ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
References in the specification and concluding claims to parts by weight of a particular element or component in a composition or article refer to the weight relationship between the element or component and any other elements or components in the composition or article for which a part by weight is expressed.
In the present invention, unless specifically indicated to the contrary, or implied by the context or customary practice in the art, all solutions referred to herein are aqueous solutions; when the solute of the aqueous solution is a liquid, all fractions and percentages are by volume, and the volume percentages of a component are based on the total volume of the composition or product containing the component; when the solute of the aqueous solution is a solid, all fractions and percentages are by weight, and the weight percentages of a component are based on the total weight of the composition or product in which the component is included.
References to "comprising," "including," "having," and similar terms in this specification are not intended to exclude the presence of any optional components, steps or procedures, whether or not any optional components, steps or procedures are specifically disclosed. In order to avoid any doubt, all methods claimed through use of the term "comprising" may include one or more additional steps, apparatus parts or components and/or materials unless stated to the contrary. In contrast, the term "consisting of … …" excludes any component, step, or procedure not specifically recited or recited. Unless otherwise specified, the term "or" refers to the listed members individually as well as in any combination.
Furthermore, the contents of any referenced patent or non-patent document in this application are incorporated by reference in their entirety, especially with respect to definitions disclosed in the art (without being inconsistent with any definitions specifically provided by the present application) and general knowledge.
In the present invention, parts are parts by weight unless otherwise indicated, temperatures are indicated in ° c or at ambient temperature, and pressures are at or near atmospheric. The room temperature means 20-30 ℃. There are many variations and combinations of reaction conditions (e.g., component concentrations, desired solvents, solvent mixtures, temperatures, pressures, and other reaction ranges) and conditions that can be used to optimize the purity and yield of the product obtained by the process. Only reasonable routine experimentation will be required to optimize such process conditions.
In the invention, the average chemical composition of the solid wastes of the steel plant is as follows: caO 40.46%; siO 2 2 19.23％；Fe 2 O 3 15.78％；Al 2 O 3 6.35％；MgO 5.18％；MnO 4.02％；TiO 2 1.37％；Cr 2 O 3 0.68％；V 2 O 5 0.49％；K 2 0.12 percent of O; the balance being ash.
The average chemical composition of bauxite powder is: al (Al) 2 O 3 56.48％；SiO 2 28.32％；TiO 2 3.61％；Fe 2 O 3 2.92％；CaO 1.38％；MgO 0.38％；MnO 0.24％；K 2 0.08 percent of O; the balance being ash.
The quartz sand is SiO 2 Mainly, the purity is 98.6%.
In order to explain the objects, concepts, features and functions of the present invention in further detail, the present invention is fully and clearly explained by referring to the following examples and comparative examples. It is understood that the following examples are merely particular embodiments of the present invention, rather than all embodiments, and that all other embodiments within the scope of the present invention are contemplated as would occur to one skilled in the art to which the invention pertains without the benefit of this disclosure.
Example 1
According to the weight ratio of 58.5:15.5:12:14, weighing the solid wastes of the iron and steel plant, quartz sand, bauxite powder and coke, ball-milling the four raw materials to 10-20 meshes, adding modified potassium titanate whiskers accounting for 0.8wt% of the weight of the four raw materials, and uniformly mixing to obtain a raw material mixture. The modified potassium titanate whisker is prepared by the following method: mixing a potassium titanate whisker raw material (with the average diameter of 0.7 mu m and the average length of 28 mu m) according to a weight ratio of 1:9 dispersing in water; heating to 80 ℃, and adding 12wt% of sodium silicate based on the weight of the potassium titanate whisker in the form of aqueous solution under stirring; adding acid to adjust the pH =9.0, and aging for 8h under the condition of heat preservation. Filtering, washing and drying at 120 ℃ to obtain the modified potassium titanate whisker.
And (3) putting the raw material mixture into the cupola from a skip feeder, and simultaneously introducing preheated oxygen. The feed mixture melted to magma at 1500 ℃.
The rock pulp is guided into a four-roller centrifuge by a chute and thrown into fine rock pulp under the centrifugal action; the cotton throwing temperature is 1360 ℃. The fine rock slurry was cooled using flowing air to obtain rock wool fibers with an average diameter of 6 μm.
Based on the weight of the rock wool fiber, 1.5wt% of phenolic resin adhesive, 0.12wt% of polydimethylsiloxane and 0.06wt% of silane coupling agent KH-550 are uniformly sprayed on the rock wool fiber.
The rock wool fiber is sunk onto a cotton collecting machine under the action of negative pressure suction to form a primary cotton belt; then the obtained product is sent into a pendulum bob machine to form a multilayer folded uniform rock wool felt and is pressed and formed.
And (3) feeding the rock wool felt into a curing furnace, introducing hot air of 220 ℃ for curing, and slitting to obtain the rock wool board.
The density of the rock wool board is 74kg/m 3 (ii) a The thermal conductivity coefficient is 0.035W/(mK); the acidity coefficient was 1.72; the combustion performance is class A.
The mechanical property index of the rock wool board is tested according to the national standard GB/T25975-2018 rock wool products for external thermal insulation of building external walls. The tensile strength of the rock wool board is 27.5kPa; the compressive strength was 87.1kPa.
Comparative example 1
According to the weight ratio of 58.5:15.5:12:14, weighing the solid wastes of the iron and steel plant, quartz sand, bauxite powder and coke, ball-milling the four raw materials to 10-20 meshes, adding 0.8wt% of potassium titanate whisker raw material (with the average diameter of 0.7 μm and the average length of 28 μm) based on the weight of the four raw materials, and uniformly mixing to obtain a raw material mixture.
And (3) putting the raw material mixture into the cupola from a skip feeder, and simultaneously introducing preheated oxygen. The feed mixture melted to magma at 1500 ℃.
The rock pulp is guided into a four-roller centrifuge by a chute and is thrown into fine rock pulp under the centrifugal action; the cotton throwing temperature is 1360 ℃. The fine pulp was cooled using flowing air to obtain rock wool fibres with an average diameter of 6 μm.
Based on the weight of the rock wool fiber, 1.5wt% of phenolic resin adhesive, 0.12wt% of polydimethylsiloxane and 0.06wt% of silane coupling agent KH-550 are uniformly sprayed on the rock wool fiber.
The rock wool fiber is sunk onto a cotton collecting machine under the action of negative pressure suction to form a primary cotton belt; then the obtained product is sent into a pendulum bob machine to form a multilayer folded uniform rock wool felt and is pressed and formed.
And (3) feeding the rock wool felt into a curing furnace, introducing hot air of 220 ℃ for curing, and slitting to obtain the rock wool board.
The density of the rock wool board is 76kg/m 3 (ii) a The thermal conductivity coefficient is 0.039W/(mK); the acidity coefficient was 1.66; the combustion performance is class A.
The mechanical property index of the rock wool board is tested according to the national standard GB/T25975-2018 rock wool products for external thermal insulation of building external walls. The tensile strength of the rock wool board is 21.9kPa; the compressive strength was 71.8kPa.
Comparative example 2
According to the weight ratio of 58.5:15.5:12:14, weighing the solid wastes of the iron and steel plant, quartz sand, bauxite powder and coke, ball-milling the four raw materials to 10-20 meshes, and uniformly mixing to obtain a raw material mixture. And (3) putting the raw material mixture into the cupola from a skip feeder, and simultaneously introducing preheated oxygen. The feed mixture melted to magma at 1500 ℃.
The rock pulp is guided into a four-roller centrifuge by a chute and is thrown into fine rock pulp under the centrifugal action; the cotton throwing temperature is 1360 ℃. The fine pulp was cooled using flowing air to obtain rock wool fibres with an average diameter of 6 μm.
Based on the weight of the rock wool fiber, 1.5wt% of phenolic resin adhesive, 0.12wt% of polydimethylsiloxane and 0.06wt% of silane coupling agent KH-550 are uniformly sprayed on the rock wool fiber.
The rock wool fiber is sunk onto a cotton collection machine under the action of negative pressure suction to form an initial cotton belt; then the obtained product is sent into a pendulum bob machine to form a multilayer folded uniform rock wool felt and is pressed and formed.
And (3) feeding the rock wool felt into a curing furnace, introducing hot air of 220 ℃ for curing, and slitting to obtain the rock wool board.
The density of the rock wool board is 77kg/m 3 (ii) a The thermal conductivity coefficient is 0.038W/(mK); the acidity coefficient was 1.64; the combustion performance is class A. The mechanical property index of the rock wool board is tested according to the national standard GB/T25975-2018 rock wool product for external thermal insulation of building external walls. The tensile strength of the rock wool board is 22.6kPa; the compressive strength was 69.5kPa.
Furthermore, it should be understood that various changes, substitutions, deletions, modifications or adjustments may be made by those skilled in the art after reading the disclosure of the present invention, and such equivalents are also within the scope of the invention as defined in the appended claims.
Claims (10)
1. A method for producing rock wool by utilizing solid wastes of a steel plant is characterized by comprising the following steps:
1) Weighing solid wastes of a steel plant, quartz sand, bauxite powder and coke, ball-milling and crushing the four raw materials, adding modified potassium titanate whiskers, and uniformly mixing to obtain a raw material mixture;
2) Putting the raw material mixture into a cupola furnace, and simultaneously introducing preheated oxygen; melting the raw material mixture into magma at 1450-1500 deg.C;
3) The rock pulp is led into a four-roller centrifuge and thrown into fine rock pulp under the centrifugal action; the cotton throwing temperature is 1320-1400 ℃; cooling the fine rock slurry by using flowing air to obtain rock wool fibers with the average diameter of 5-7 mu m;
4) Uniformly spraying phenolic resin adhesive, polydimethylsiloxane and silane coupling agent KH-550 on the rock wool fibers;
5) The rock wool fiber is sunk and descended under the action of negative pressure suction to form a primary cotton belt; then the mixture is sent into a pendulum bob machine to form a multilayer folded uniform rock wool felt and is pressed and formed;
6) And (3) feeding the rock wool felt into a curing furnace, introducing hot air at 200-260 ℃ for curing, and slitting to obtain the rock wool board.
2. The method of claim 1, wherein the weight ratio of the steel plant solid waste, the quartz sand, the bauxite and the coke is 56-61:14-17:10-14:12-16.
3. The method according to claim 1, wherein the modified potassium titanate whiskers are added in an amount of 0.5 to 1.1wt% of the four raw materials.
4. The method of claim 1, wherein the modified potassium titanate whiskers are silica surface modified potassium titanate whiskers.
5. The method according to claim 4, wherein the modified potassium titanate whiskers are obtained by heat-preserving aging of a potassium titanate whisker raw material and sodium silicate at 70-90 ℃ and pH = 8.0-10.0.
6. The method according to claim 5, wherein the weight ratio of the potassium titanate whisker raw material to the sodium silicate is 100: (10-14).
7. The method of claim 5, wherein the potassium titanate whisker raw material has an average diameter of 0.5-1.0 μm and an average length of 20-50 μm.
8. The method of claim 1, wherein the average chemical composition of the steel plant solid waste is: 38-43% of CaO; siO 2 2 17-22％；Fe 2 O 3 14-18％；Al 2 O 3 5-7％；MgO 4-6％；MnO 3-5％；TiO 2 1-2％；Cr 2 O 3 0.4-0.8％；V 2 O 5 0.3-0.7％；K 2 0.05 to 0.2 percent of O; the balance being ash.
9. The method of claim 1, wherein the bauxite ore fines have an average chemical composition of: al (Al) 2 O 3 53-60％；SiO 2 25-32％；TiO 2 3-5％；Fe 2 O 3 2-4％；CaO 1-2％；MgO 0.2-0.6％；MnO 0.15-0.35％；K 2 0 to 0.2 percent of O; the balance being ash.
10. The method as claimed in claim 1, wherein the phenolic resin binder, the polydimethylsiloxane and the silane coupling agent KH-550 are added in amounts of 1-2wt%, 0.06-0.18wt% and 0.02-0.10wt%, respectively, based on the weight of the rock wool fibers.
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| US20180319692A1 (en) * | 2015-11-09 | 2018-11-08 | Eco'ring | Method for producing rock wool and recoverable cast iron |
| US9796635B1 (en) * | 2016-06-22 | 2017-10-24 | Usg Interiors, Llc | Large diameter slag wool, composition and method of making same |
| CN108218238A (en) * | 2017-12-11 | 2018-06-29 | 鞍钢股份有限公司 | A kind of rock wool and its production method using metallurgical waste and blast furnace cinder as raw material |
| CN111533459A (en) * | 2020-05-14 | 2020-08-14 | 南京彤天岩棉有限公司 | Formula of high-durability rock wool |
| CN112159113A (en) * | 2020-10-10 | 2021-01-01 | 安徽岩棉建材科技有限公司 | High-strength flame-retardant black rock wool and preparation method thereof |
| CN114426395A (en) * | 2020-10-29 | 2022-05-03 | 中环正奇科技有限公司 | Process method for producing mineral wool by using blast furnace slag |
| CN113526943A (en) * | 2021-07-30 | 2021-10-22 | 天长市康美达新型绝热材料有限公司 | High-durability rock wool and preparation method thereof |
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