CN113880444A - Boron-containing rock wool and preparation method thereof - Google Patents
Boron-containing rock wool and preparation method thereof Download PDFInfo
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- CN113880444A CN113880444A CN202111338123.2A CN202111338123A CN113880444A CN 113880444 A CN113880444 A CN 113880444A CN 202111338123 A CN202111338123 A CN 202111338123A CN 113880444 A CN113880444 A CN 113880444A
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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
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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
- C03B37/10—Non-chemical treatment
- C03B37/16—Cutting or severing
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Abstract
The invention discloses a boron-containing rock wool and a preparation method thereof, wherein the rock wool comprises the following components in parts by weight: 50-60 parts of basalt, 10-20 parts of dolomite, 20-30 parts of bricks, 5-10 parts of slag, 10-20 parts of coke, 5-10 parts of boron-containing materials and 6-10 parts of binders. The rock wool components, the proportion and the preparation method provided by the invention ensure that the melt temperature of the raw materials is reduced from 1450 ℃ to 1350 ℃, the melt viscosity is 0.5-2.5Pas, and the range span of the optimal fiber forming temperature is increased to 40 ℃ along with the temperature of 10 ℃ in the production process of the rock wool. Meanwhile, the average diameter of the rock wool fiber is reduced to 3.4 +/-0.27 mu m after the boron material is added, and the tensile strength of the rock wool fiber is increased to 2100 +/-100 MPa. The method can reduce the production energy consumption of the cupola by about 10 percent, the production control is more stable, and the quality of the prepared rock wool product is improved.
Description
Technical Field
The invention relates to the technical field of rock wool heat-insulating materials, in particular to rock wool containing boron components and a preparation method thereof.
Background
Rock wool is a building heat-insulating material with outstanding performance, and has the performances of heat preservation, sound absorption, heat insulation, fire prevention, air permeability and the like. The only heat-insulating material which can completely meet the A-level non-combustible heat-insulating material in the current national and industrial standards of China is all the heat-insulating materials outside the outer wall with mature application technology.
With the continuous expansion of rock wool productivity, energy conservation and consumption reduction become important factors for enterprise development. The traditional rock wool products all adopt high-quality basalt, dolomite and the like as main raw materials, are melted at a high temperature of over 1450 ℃, are subjected to high-speed centrifugation into fibers by adopting an international advanced four-shaft centrifuge, are sprayed with a certain amount of binder, dustproof oil and water repellent at the same time, are collected by a cotton collecting machine, pass through a pendulum bob method process, and are then cured and cut to form rock wool products with different specifications and purposes. How to reduce the energy consumption of cupola furnace becomes the key point of energy-saving modification.
In the traditional rock wool preparation process, the defects of high melt temperature and narrow melt temperature range exist, so that the energy consumption is high, and meanwhile, the temperature is not easy to control.
The patent application "the process for co-producing nickel pig iron and rock wool products by using laterite-nickel ore" (application number: CN201510119518.1) has the following description: in order to reduce the viscosity of the melt, a certain amount of dolomite and blocky blast furnace cooling slag are often added in the ingredients, and in the smelting process, in order to reduce the consumption of coke, means such as heating air supply, oxygen-enriched air supply and the like are also needed. However, the mineral such as basalt is limited by the production area, and long-distance transportation increases the cost, so that the rock wool industry cannot be generally developed. In order to reduce energy consumption, the patent application "pure oxygen combustion system for rock wool melt temperature multipoint accurate control" (application number: CN201510601219.1) adopts a pure oxygen combustion system with temperature multipoint accurate control, however, the problems of high melt temperature and narrow range cannot be thoroughly solved.
Therefore, there is room for improvement in the production of existing rock wool.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the rock wool containing the boron component and the preparation method thereof, which can effectively reduce the melting temperature of raw materials and reduce the energy consumption in the production process of the rock wool serving as a heat-insulating material, and adopts the following technical scheme:
the invention provides a boron-containing rock wool as a first aspect, which comprises the following components in parts by weight: 40-50 parts of basalt, 10-20 parts of dolomite, 20-30 parts of bricks, 5-10 parts of slag, 10-20 parts of coke, 5-10 parts of boron-containing materials and 6-10 parts of binders.
Preferably, the boron-containing material is one or a mixture of several of boron magnesite, borax, colemanite and boronatrocalcite, and the boron content is 20-50%.
More preferably, the boron-containing material is colemanite.
Preferably, the binder is any one or a mixture of more of phenolic resin, ammonia water, a water repellent, a coupling agent and softened water.
Preferably, the rock wool comprises the following components:
or, preferably, the rock wool comprises the following components:
or, preferably, the rock wool comprises the following components:
or, preferably, the rock wool comprises the following components:
or, preferably, the rock wool comprises the following components:
preferably, the blockiness of the basalt is 100-300mm, the proportion of the super-particle size is less than 10 percent, the acidity coefficient is more than 1.2, and the density is more than 1.6g/cm3。
Preferably, the dolomite has a lumpiness of 60-90mm and a proportion of super-grains of < 10%.
Preferably, the block size of the brick is 100-200mm, and the proportion of the super-particle size is less than 10%. The brick is prepared according to the following steps: the brick is crushed by the recycled waste rock wool, cement is added according to the formula for mixing, the mixture is pressed and formed, and then the brick enters a steam curing kiln for curing.
Wherein the adding proportion of the cement in the brick is 30-45%, the adding proportion of the waste cotton is 30-40%, and the water content of the mixed material is 20-30%.
Preferably, the lumpiness of the slag is 100-150mm, and the proportion of the super-particle size is less than 10%.
Preferably, the lump size of the coke is 200-300mm, the proportion of the super-particle size is less than 10 percent, and the heat value is more than 6500K.
As a second aspect of the present invention, there is provided a method for preparing rock wool, comprising the steps of:
step 1, respectively weighing basalt, dolomite, bricks, slag, coke and boron-containing materials according to weight proportion, and then mixing;
step 2, adding the mixed raw materials into a cupola, and keeping the temperature in the cupola within the range of 1300-1400 ℃ to melt the raw materials to obtain a melt;
step 3, forming fibers by four-wheel high-speed centrifugation of the molten melt, and spraying 6-10 parts of adhesive in the centrifugation process; the spraying speed is 2000-3000L/h, and the spraying temperature is normal temperature.
And 4, pleating and pressurizing the rock wool fibers, then curing the rock wool fibers in a curing furnace, and then cutting the rock wool fibers to form rock wool products with different specifications and purposes.
Compared with the prior art, the invention has the beneficial effects that:
the rock wool components, the proportion and the preparation method provided by the invention ensure that the melt temperature of the raw materials is reduced from 1450 ℃ to 1350 ℃, the melt viscosity is 0.5-2.5Pas, and the range span of the optimal fiber forming temperature is increased to 40 ℃ along with the temperature of 10 ℃ in the production process of the rock wool. Meanwhile, the characterization of the rock wool fiber of the boron-containing material shows that the average diameter of the fiber is reduced from 5.6 +/-0.45 mu m to 3.4 +/-0.27 mu m after the boron material is added, and the tensile strength of the fiber is increased from 1700 +/-80 MPa to 2100 +/-100 MPa.
In addition, the preparation method provided by the invention can reduce the production energy consumption of the cupola by about 10%, the production control is more stable, and the quality of the prepared rock wool product is improved.
Detailed Description
In order to fully illustrate the preparation idea and concept of the present patent, the preparation method of the present patent is verified in the following examples, which are only for illustration and representative of specific examples and should not be interpreted or interpreted as a limitation of the protection of the present invention.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In the present invention, the proportion of the super-particle size is the proportion of the portion larger or smaller than the bulk size in the whole.
The raw materials adopted by the invention are all purchased from commercial products, and if not specifically stated, the raw materials of the following components can be adopted:
the boron content of the boron-magnesium stone is low, and the use cost is high; borax and ulexite have high boron-containing components but high prices, so the embodiment of the invention adopts colemanite to research the product performance of different addition amounts.
The water repellent adopts SILRES BS 1042 produced by rock wool water repellent Wake chemistry; the coupling agent is selected from silane coupling agents for rock wool.
2, the binder adopted in the embodiment is water-soluble phenolic resin, the solid content is 30-50%, the content of free aldehyde is less than or equal to 0.7%, and the content of free phenol is less than or equal to 1%. The binder is diluted by phenolic resin and water, and the content of the binder is 5-20%.
3, the brick adopted in the embodiment is prepared according to the following steps:
the brick is crushed by the recycled waste rock wool, cement is added according to the formula for mixing, the mixture is pressed and formed, and then the brick enters a steam curing kiln for curing.
Wherein the adding proportion of the cement in the brick is 30-45%, the adding proportion of the waste cotton is 30-40%, and the water content of the mixed material is 20-30%.
The waste cotton mainly comprises waste cotton produced by a production line, unqualified rock wool boards and recycled slag balls, and the components of the waste cotton are consistent with those of the rock wool boards; the brick adding mainly solves the problem of waste cotton produced in the production line, the unqualified products produced in the production line are crushed and then are made into bricks, and then are melted again to form cotton, so that waste is utilized
Example 1 production formula of boron-containing rock wool thermal insulation material
Comprises the following components:
50 portions of basalt with the block size of 100-300mm, 8 percent of super-particle size, the acidity coefficient of 1.35 and the density of 1.71g/cm3；
10 parts of dolomite, the lumpiness of the dolomite is 60-90mm, and the proportion of the super-particle size is 8%;
20 parts of bricks, the block size is 100-200mm, and the super-particle size ratio is 3%; the cement adding proportion is 20%, the waste cotton adding proportion is 30%, and the mixed material water content is 20%;
5 parts of slag;
18.1 parts of coke;
5 parts of colemanite, wherein the boron content is 36.84 percent calculated by boron trioxide;
6 parts of a binder.
Example 2 production formula of boron-containing rock wool thermal insulation material
Comprises the following components:
40 portions of basalt with the block size of 100 plus 300mm, the proportion of the super-particle size of 9 percent, the acidity coefficient of 1.35 and the density of 1.71g/cm3；
20 parts of dolomite, the lumpiness of the dolomite is 60-90mm, and the proportion of the super-particle size is 9%;
30 parts of bricks, the block size is 100-200mm, and the super-particle size ratio is 5%; the cement adding proportion is 30%, the waste cotton adding proportion is 20%, and the mixed material water content is 10%;
10 parts of slag;
17.5 parts of coke;
6 parts of colemanite;
6 parts of a binder.
Example 3 production formula of boron-containing rock wool thermal insulation material
Comprises the following components:
45 parts of basalt, the block size of 100 plus 300mm, the proportion of the super-particle size of 6 percent, the acidity coefficient of 1.35 and the density of 1.71g/cm3；
10 parts of dolomite, the lumpiness of the dolomite is 60-90mm, and the proportion of the super-particle size is 6 percent;
20 parts of bricks, the block size is 100-200mm, and the super-particle size ratio is 4%; the cement adding proportion is 28%, the waste cotton adding proportion is 15%, and the mixed material water content is 15%;
5 parts of slag;
17.8 parts of coke;
7 parts of colemanite;
6 parts of a binder.
Example 4 production formula of boron-containing rock wool thermal insulation material
Comprises the following components:
45 portions of basalt, the block size of 100 plus 300mm, the proportion of the super-particle size of 10 percent, the acidity coefficient of 1.35 and the density of 1.71g/cm3；
10 parts of dolomite, the lumpiness of the dolomite is 60-90mm, and the proportion of the super-particle size is 10%;
20 parts of bricks, the block size is 100-200mm, and the super-particle size ratio is 8%; the cement adding proportion is 24%, the waste cotton adding proportion is 18%, and the mixed material water content is 15%;
5 parts of slag;
17.6 parts of coke;
8 parts of colemanite;
6 parts of a binder.
Example 5 production formula of boron-containing rock wool thermal insulation material
Comprises the following components:
45 portions of basalt, the block size of 100 plus 300mm, the proportion of the super-particle size of 7 percent, the acidity coefficient of 1.35 and the density of 1.71g/cm3；
10 parts of dolomite, the lumpiness of the dolomite is 60-90mm, and the proportion of the super-particle size is 7%;
20 parts of bricks, the block size is 100-200mm, and the super-particle size ratio is 5%; the cement adding proportion is 26%, the waste cotton adding proportion is 18%, and the mixed material water content is 16%;
5 parts of slag;
16.9 parts of coke;
10 parts of colemanite;
6 parts of a binder.
Comparative example 1:
the rock wool formula adopting the following components is as follows:
example 6: the preparation method of the rock wool comprises the following steps:
step 1, respectively weighing basalt, dolomite, bricks, slag, coke and boron-containing materials according to weight proportion, and then mixing;
step 2, adding the mixed raw materials into a cupola, and keeping the temperature in the cupola within the range of 1300-1500 ℃ to melt the raw materials to obtain a melt;
step 3, forming fibers by four-wheel high-speed centrifugation of the molten melt, and spraying 6-10 parts of adhesive in the centrifugation process; the spraying speed is 2000-3000L/h, and the spraying temperature is normal temperature.
And 4, pleating and pressurizing the rock wool fibers, then curing the rock wool fibers in a curing furnace, and then cutting the rock wool fibers to form rock wool products with different specifications and purposes.
The rock wool products prepared according to the preparation methods provided in example 6 in examples 1 to 5 and comparative example 1 were tested for tensile strength and thermal conductivity, and the results are summarized in the following table:
wherein, the tensile strength of the rock wool finished product is detected according to rock wool standard GB/T25975-2018.
The detection method or standard of the thermal conductivity coefficient is GB/T25975-2018
The average fiber diameter standard is GB/T5480-2017
TABLE 2 comparison table of energy consumption and performance of rock wool products prepared in examples 1-5 and comparative example 1
| Melt temperature | Coke dosage | Tensile strength of rock wool | Average fiber diameter | Coefficient of thermal conductivity | |
| Example 1 | 1400℃-1430℃ | 18.1 parts of | 197kpa | 4.55um | 0.039W/(M·K) |
| Example 2 | 1390℃-1415℃ | 17.5 parts of | 224kpa | 4.38um | 0.0381W/(M·K) |
| Example 3 | 1385℃-1412℃ | 17.8 parts of | 202kpa | 4.11um | 0.0363W/(M·K) |
| Example 4 | 1368℃-1398℃ | 17.6 parts | 235kpa | 3.85um | 0.0361W/(M·K) |
| Example 5 | 1350℃-1390℃ | 16.9 portions | 252kpa | 3.37um | 0.0342W/(M·K) |
| Comparative example 1 | 1450℃-1460℃ | 18.6 parts | 150kpa | 4.82um | 0.0410W/(M·K) |
The coke amount in the table is the coke amount providing heat, which is related to the production energy consumption.
The melt temperature is the apparent temperature of the melt exiting from the cupola siphon.
By comparison, the formula and the preparation method of the rock wool containing the boron component provided by the invention have the advantages that the production energy consumption of the cupola furnace is reduced by about 10%, the production cost is obviously reduced, the production control is more stable, and the strength of the prepared rock wool product is increased.
When the melt viscosity is 0.5-2.5pas, the rock wool fiber produced by centrifuging the melt is the best, and the fiber is difficult to form when the melt viscosity is too low and too high; the melt viscosity is reduced along with the increase of the melt temperature, in the prior art, when the melt viscosity is 0.5-2.5pas, the melt temperature is 1450-.
The possible reasons for the analysis are as follows: in the rock wool component, the content of silicon dioxide is more than 45%, and the boron-containing material B-O tetrahedron and SiO2The S-O tetrahedron is directly connected, and the original regular tetrahedron configuration is changed in the connection process, so that SiO is generated2The stability itself is lowered, thereby lowering the melting temperature thereof.
In the prior art, the melt has proper viscosity only after being heated to about 1450 ℃, and the range is narrow; after the boron-containing material is added, the melt only needs to be heated to 1350 ℃, the required coke amount is reduced, and the energy consumption is reduced.
In the production process of the rock wool, because the optimal fiber forming temperature range of the melt is enlarged, the viscosity of the melt is more stable, and the produced rock wool fiber is more uniform. The uniform fiber of the rock wool also reduces the heat transfer coefficient, mainly because the space in the rock wool material is uniform after the fiber is uniform, which is beneficial to the heat loss and radiation. The heat transfer coefficient is small, the heat transfer is slow, and the heat preservation effect is good.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The rock wool containing the boron component is characterized by comprising the following components in parts by weight: 50-60 parts of basalt, 10-20 parts of dolomite, 20-30 parts of bricks, 5-10 parts of slag, 10-20 parts of coke, 5-10 parts of boron-containing materials and 6-10 parts of binders.
2. The boron component-containing rock wool as claimed in claim 1, wherein the basalt has a lumpiness of 100-300mm, a super-particle size ratio of < 10%, an acidity coefficient of > 1.2, and a density of greater than 1.6g/cm3。
3. The boron component-containing rock wool according to claim 1, wherein said dolomite has a lumpiness of 60 to 90mm and a proportion of super grains of < 10%.
4. The boron component-containing rock wool as claimed in claim 1, wherein the block size of the brick is 100-200mm, and the proportion of the super-particle size is less than 10%;
the brick is prepared according to the following steps: the brick is prepared by crushing recycled waste rock wool, mixing the materials by adding cement according to a formula, performing compression molding, and then curing in a steam curing kiln.
5. The boron component-containing rock wool according to claim 4, wherein the cement is added in the brick at a ratio of 30-45%, the waste cotton is added at a ratio of 30-40%, and the water content of the mixed material is 20-30%.
6. The boron component-containing rock wool as claimed in claim 1, wherein said slag has a lumpiness of 100-150mm and a super-particle-size ratio of < 10%.
7. The boron component-containing rock wool as claimed in claim 1, wherein the lump size of said coke is 200-300mm, the proportion of ultra-particle size is less than 10%, and the calorific value is greater than 6500K.
8. The rock wool containing boron according to claim 1, wherein the boron content of said boron-containing material is 20-50%; the boron-containing material is selected from one or more of ascharite, borax, colemanite and boronatrocalcite.
9. The boron component-containing rock wool according to claim 1, wherein the binder is any one or a mixture of more of phenolic resin, ammonia water, water repellent, coupling agent and softened water; the phenolic resin is water-soluble phenolic resin, the solid content is 30-50%, the content of free aldehyde is less than or equal to 0.7%, and the content of free phenol is less than or equal to 1%; the content of the binder is 5-20%.
10. The method for preparing rock wool according to claim 1, comprising the following steps:
step 1, respectively weighing basalt, dolomite, bricks, slag, coke and boron-containing materials according to weight proportion, and then mixing;
step 2, adding the mixed raw materials into a cupola, and keeping the temperature in the cupola within the range of 1300-1400 ℃ to melt the raw materials to obtain a melt;
step 3, forming fibers by four-wheel high-speed centrifugation of the molten melt, and spraying a binder in the centrifugation process;
and 4, pleating and pressurizing the rock wool fibers, then curing the rock wool fibers in a curing furnace, and then cutting the rock wool fibers to form rock wool products with different specifications and purposes.
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