CN112551882A - Method for treating and recycling waste agricultural rock wool and agricultural rock wool - Google Patents
Method for treating and recycling waste agricultural rock wool and agricultural rock wool Download PDFInfo
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- CN112551882A CN112551882A CN202011575575.8A CN202011575575A CN112551882A CN 112551882 A CN112551882 A CN 112551882A CN 202011575575 A CN202011575575 A CN 202011575575A CN 112551882 A CN112551882 A CN 112551882A
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- 239000011490 mineral wool Substances 0.000 title claims abstract description 177
- 239000002699 waste material Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004064 recycling Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 49
- 239000002918 waste heat Substances 0.000 claims description 36
- 238000001035 drying Methods 0.000 claims description 35
- 238000002844 melting Methods 0.000 claims description 28
- 230000008018 melting Effects 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000002243 precursor Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 14
- 229910001570 bauxite Inorganic materials 0.000 claims description 13
- 229910000514 dolomite Inorganic materials 0.000 claims description 13
- 239000010459 dolomite Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 229920000742 Cotton Polymers 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 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 9
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 241000196324 Embryophyta Species 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 6
- 230000002940 repellent Effects 0.000 claims description 6
- 239000005871 repellent Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 239000010878 waste rock Substances 0.000 claims description 5
- 210000002268 wool Anatomy 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 6
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- 239000002002 slurry Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000012271 agricultural production Methods 0.000 description 3
- 239000002154 agricultural waste Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
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- 231100000252 nontoxic Toxicity 0.000 description 1
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Classifications
-
- 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
- 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
-
- 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
Abstract
The invention relates to a method for treating and recycling waste agricultural rock wool, which solves the problem that the waste agricultural rock wool is accumulated in a large quantity to pollute the environment. In the manufacturing process, the recycling of the waste agricultural rock wool and the recycling of energy are realized. The method for treating and recycling the waste agricultural rock wool is widely applied to the technical field of rock wool production and the field of environmental protection.
Description
Technical Field
The invention relates to the field of solid waste treatment, in particular to a method for treating and recycling waste agricultural rock wool.
Background
China is a big agricultural country since ancient times, science and technology are advanced in the modern society taking people as the basis, the society is developed, and scientific planting becomes an indispensable choice for improving crop yield. With the advent of rock wool materials, rock wool for agricultural production has also been vigorously developed.
Compared with common rock wool, the agricultural rock wool has the advantages that special components are added in the production process of the rock wool, so that the agricultural rock wool has better water absorption and retention functions. As the product is used for agricultural production, the product must be nontoxic and harmless and have good chemical stability. Is an important planting substrate for modern agricultural production. The agricultural rock wool is matched with the modern irrigation technology for use, so that the growth speed of crops can be greatly increased, the growth quality of the crops can be improved, and the cost can be reduced.
With the improvement of the living standard of people, modern people pay more and more attention to health preservation, and the original ecological product greenhouse is built like a bamboo shoot in spring after rain, so that the development of the agricultural rock wool manufacturing industry is greatly promoted. Besides meeting market demands and improving crop yield, the output of a large amount of agricultural rock wool also brings serious environmental problems due to the fact that a large amount of waste agricultural rock wool is laid everywhere. And the market price of the agricultural rock wool is 61 yuan/square meter, which is much higher than that of the common rock wool. Therefore, it is very important to find a method for recycling waste agricultural rock wool.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a method for treating and recycling waste agricultural rock wool.
The invention is realized by the following steps:
the method for treating and recycling the waste agricultural rock wool comprises the following raw material components of waste agricultural rock wool, basalt, dolomite and bauxite, and specifically comprises the following steps:
s1: treating a precursor: firstly, cutting waste agricultural rock wool into blocks, effectively destroying a film integrally coated by the agricultural rock wool, squeezing water in the waste agricultural rock wool by using a press, and finally drying the waste agricultural rock wool by using a drying furnace to ensure that the water content of broken rock wool residues is not more than 1%;
s2: calcining the dried waste rock wool residue in a high-temperature furnace, removing organic resins such as plant root systems, fiber attachments and the like contained in the waste agricultural rock wool, ensuring that the content of organic matters in the rock wool residue is not more than 0.5%, wherein the heat for calcining is derived from carbon monoxide generated by a melting furnace, fully combusting in an incinerator, and recovering waste heat;
s3: crushing the precursor obtained in the step S2, mixing the precursor with cement according to the mass ratio of 5:1-8:1, adding a proper amount of water, uniformly stirring, pressing into blocks, curing and drying for later use;
s4: weighing the solid block prepared by S3, basalt, dolomite and bauxite, wherein the mass parts of the components are respectively as follows: 38-41 parts of solid block, 42-44 parts of basalt, 16-19 parts of dolomite and 4-7 parts of bauxite; mixing and homogenizing for many times, and feeding into a melting furnace; after the mixture is melted into magma, the magma flows out from a siphon port of the melting furnace, and is thrown into rock wool fibers under the high-speed centrifugal action of a four-roller centrifugal machine, and at the same time, 130 parts of adhesive, 1.5-2.0 parts of water repellent and 1.2-1.5 parts of dustproof oil are sprayed;
s5: collecting the rock wool fibers spun in the step S4 on a cotton collecting screen plate of a cotton collecting machine under the dual functions of blowing-off air and negative pressure air; utilizing a pendulum to lay the collected rock wool fibers into rock wool fiber layers with a multi-layer loose structure; laminating the rock wool fibers into a three-dimensional fiber structure by using a three-dimensional pleating machine;
s6: the pressed rock wool is put into a curing furnace for curing and forming, the curing temperature is 150-250 ℃, and the chemical components of the obtained rock wool comprise SiO2、Al2O3、CaO、MgO。
As a preferred embodiment, the waste agricultural rock wool cut in the step S1 is not more than 500mm in block size; the temperature of the drying furnace is set to be 150-400 ℃, and the heat for drying is derived from the waste heat generated by the multistage heat exchanger, the waste heat generated by the curing furnace and the waste heat generated by the high-temperature furnace.
As a preferred embodiment, the heat of the drying oven used in step S1 comes from three ways: after carbon monoxide generated by the melting furnace is fully combusted in the incinerator, waste heat is exchanged by the multi-stage heat exchanger; the burner generates heat and the waste heat after passing through the rock wool curing furnace; after organic resins such as plant roots, fiber attachments and the like contained in the agricultural rock wool are incinerated by the high-temperature furnace, the waste heat of tail gas is recovered.
As a preferred embodiment, the temperature range of the high-temperature furnace incineration in the step S2 is 500 ℃ to 900 ℃; the temperature range of melting the mixture into magma in the step S4 is 1400-1800 ℃.
In a preferred embodiment, the high-temperature furnace heat is derived from waste heat of the tail of the incinerator, and the incinerator heat is derived from the sufficient combustion of carbon monoxide tail gas generated by a melting furnace for producing rock wool in the incinerator; the heat of a drying furnace for drying the waste agricultural rock wool and a high-temperature furnace for burning root systems and organic matters are both from waste heat recovery.
As a preferred embodiment, the waste heat of the pretreatment of the waste agricultural rock wool in the step S2 comes from the rock wool production process and generates different heat gradients, the waste heat in the low-temperature section is used for drying the waste agricultural rock wool, and the waste heat in the high-temperature section is used for incinerating root systems and organic matters in the waste agricultural rock wool.
As a preferred embodiment, the size of the broken pieces obtained by breaking rock wool in step S3 is not greater than 40 mm.
As a preferred embodiment, the binder used in step S4 is a phenolic resin.
As a preferred embodiment, the chemical composition of the waste agricultural rock wool should include SiO2、Al2O3CaO, MgO, and SiO in an amount of 100% by weight of the total chemical composition2The mass fraction is as follows: 42 to 48 percent; al (Al)2O3The mass fraction of is as follows: 13 to 18 percent; the CaO comprises the following components in percentage by mass: 15 to 23 percent; the mass fraction of MgO is 8-13%.
The invention further claims an agricultural rock wool prepared by the method for treating and recycling the waste agricultural rock wool.
The invention has the following effects:
(1) the surplus heat emitted by the incinerator is collected, the temperature is converted into dry waste agricultural rock wool fragments through the heat exchanger, energy recycling is guaranteed, and production cost is saved.
(2) The agricultural rock wool prepared by the method has stable water content and guaranteed quality and strength; the root system and the fiber resin are moderate, the tensile force between fibers is better, and the fibers are not easy to be broken.
(3) Chemical composition of agricultural rock woolContains SiO in2、Al2O3CaO and MgO, and the mass fraction of each chemical component is calculated by reasonable collocation, and the recycled waste added in the raw materials can still keep the reasonable chemical components of the produced rock wool, so that the stability of the rock wool fiber can be improved.
(4) The acidity coefficient of the agricultural rock wool can reach 2.0-2.1, so that the rock wool product has high stability and good weather resistance.
(5) The rock wool has a multi-layer three-dimensional fiber structure, good gaps are beneficial to improving the heat preservation effect of the rock wool, and the integral strength of the rock wool is ensured by the hooked fiber structure.
(6) The rock wool is prepared by adopting the recovered waste materials such as furnace slag, cutting crushed aggregates, old rock wool removed and eliminated by building disassembly and the like generated in the production and use processes of the rock wool, so that the generation of solid waste in the production and use processes of the rock wool is greatly reduced, the cost of raw materials is saved, and the method has higher environmental protection and economic benefits.
Detailed Description
The present invention will be further described with reference to specific examples to assist understanding of the invention. The method used in the invention is a conventional method if no special provisions are made; the raw materials and the apparatus used are, unless otherwise specified, conventional commercially available products.
Example 1
The invention provides a preparation method of rock wool prepared by adopting recycled waste, which comprises the following steps:
s1: treating a precursor: cutting waste agricultural rock wool into blocks with the size of 400mm, enabling the recovered waste agricultural rock wool to pass through a press to squeeze water in the waste agricultural rock wool, drying the waste agricultural rock wool through a drying furnace, setting the drying temperature to be 180 ℃, and drying for 3 hours, wherein heat for drying is derived from waste heat of a multi-stage heat exchanger, waste heat of a curing furnace and waste heat of a high-temperature furnace for burning rock wool, so that the heat achieves the effect of recycling, and the water content of rock wool residues is detected to be not more than 1%;
s2: burning the dried waste rock wool residue in a high-temperature furnace at 700 ℃ for 1h to burn organic resins such as plant roots, fiber attachments and the like contained in the waste agricultural rock wool, detecting that the content of organic matters in the rock wool residue is not more than 0.5%, fully burning carbon monoxide generated by a burning heat source melting furnace in the burning furnace, and recovering waste heat;
s3: crushing the precursor obtained in the step S2, wherein the average particle size is 20mm, and the precursor and the cement are mixed according to the weight ratio of 7: 1, adding a proper amount of water, uniformly stirring, pressing into a cylindrical shape with the height of 100mm and the diameter of 100mm into blocks, and completely curing and drying cement for later use;
s4: weighing the solid block prepared by the step S3, basalt, dolomite and bauxite according to the mass parts, wherein the mass parts of the components are as follows: 38 parts of solid block, 42 parts of basalt, 16 parts of dolomite and 4 parts of bauxite; mixing and homogenizing for many times, and feeding into a melting furnace; melting the mixture into magma at 1800 ℃; the rock slurry flows out from a siphon port of the melting furnace, is thrown into rock wool fibers under the high-speed centrifugal action of a four-roller centrifugal machine, and is sprayed with 122 parts of binder, 1.6 parts of water repellent and 1.3 parts of dustproof oil;
s5: collecting the rock wool fibers spun in the step S4 on a cotton collecting screen plate of a cotton collecting machine under the dual functions of blowing-off air and negative pressure air; utilizing a pendulum to lay the collected rock wool fibers into rock wool fiber layers with a multi-layer loose structure; laminating the rock wool fibers into a three-dimensional fiber structure by using a three-dimensional pleating machine;
s6: curing and forming the pressed rock wool in a curing furnace at the curing temperature of 150 ℃ to prepare the new rock wool and ensure that the chemical components of the new rock wool comprise SiO2、Al2O3、CaO、MgO。
The test results of the rock wool prepared from the recycled waste are shown in table 1:
TABLE 1
Example 2
The invention provides a preparation method of rock wool prepared by adopting recycled waste, which comprises the following steps:
s1: treating a precursor: cutting waste agricultural rock wool into blocks with the size of 400mm, enabling the recovered waste agricultural rock wool to pass through a press to squeeze water in the waste agricultural rock wool, drying the waste agricultural rock wool through a drying furnace, setting the drying temperature to be 200 ℃, and setting the drying time to be 2.5h, wherein heat for drying is derived from waste heat of a multi-stage heat exchanger, waste heat of a curing furnace and waste heat of a high-temperature furnace for incinerating rock wool, so that the heat achieves the effect of recycling, and the water content of rock wool residues is not more than 1% through detection;
s2: burning the dried waste rock wool residue in a high-temperature furnace at the temperature of 750 ℃ for 1h to burn organic resins such as plant roots, fiber attachments and the like contained in the waste agricultural rock wool, detecting that the content of organic matters in the rock wool residue is not more than 0.5%, and fully burning carbon monoxide generated by a burning heat source melting furnace in a burning furnace to recover waste heat;
s3: crushing the precursor obtained in the step S2, wherein the average particle size is 20mm, and the precursor and the cement are mixed according to the weight ratio of 6: 1, adding a proper amount of water, uniformly stirring, pressing into a cylindrical shape with the height of 100mm and the diameter of 100mm into blocks, and completely curing and drying cement for later use;
s4: weighing the solid block prepared by the step S3, basalt, dolomite and bauxite according to the mass parts, wherein the mass parts of the components are as follows: 38 parts of solid block, 42 parts of basalt, 17 parts of dolomite and 3 parts of bauxite; mixing and homogenizing for many times, and feeding into a melting furnace; melting the mixture into magma at 1800 ℃; the rock slurry flows out from a siphon port of the melting furnace, is thrown into rock wool fibers under the high-speed centrifugal action of a four-roller centrifugal machine, and is sprayed with 127 parts of binder, 1.6 parts of water repellent and 1.4 parts of dustproof oil;
s5: collecting the rock wool fibers spun in the step S4 on a cotton collecting screen plate of a cotton collecting machine under the dual functions of blowing-off air and negative pressure air; utilizing a pendulum to lay the collected rock wool fibers into rock wool fiber layers with a multi-layer loose structure; laminating the rock wool fibers into a three-dimensional fiber structure by using a three-dimensional pleating machine;
s6: curing and forming the pressed rock wool in a curing furnace at the curing temperature of 150 ℃ to prepare the new rock wool and ensure that the chemical components of the new rock wool comprise SiO2、Al2O3、CaO、MgO。
The results of the tests on rock wool produced from recycled waste are shown in table 2:
TABLE 2
Example 3
The invention provides a preparation method of rock wool prepared by adopting recycled waste, which comprises the following steps:
s1: treating a precursor: cutting waste agricultural rock wool into blocks of 400mm, allowing the recovered waste agricultural rock wool to pass through a press to squeeze water in the waste agricultural rock wool, and drying the waste agricultural rock wool in a drying furnace at a drying temperature of 230 ℃ for 2.5 hours, wherein the heat for drying is derived from waste heat of a multi-stage heat exchanger, waste heat of a curing furnace and waste heat of a high-temperature furnace for burning rock wool, so that the heat achieves the effect of recycling, and the water content of rock wool residues is detected to be not more than 1%;
s2: burning the dried waste rock wool residue in a high-temperature furnace at the temperature of 750 ℃ for 1.5h to burn organic resins such as plant roots, fiber attachments and the like contained in the waste agricultural rock wool, detecting that the content of organic matters in the rock wool residue is not more than 0.5%, and fully burning carbon monoxide generated by a burning heat source melting furnace in a burning furnace for waste heat recovery;
s3: crushing the precursor obtained in the step S2, wherein the average particle size is 20mm, and the precursor and the cement are mixed according to the weight ratio of 8:1, adding a proper amount of water, uniformly stirring, pressing into a cylindrical shape with the height of 100mm and the diameter of 100mm into blocks, and completely curing and drying cement for later use;
s4: weighing the solid block prepared by the step S3, basalt, dolomite and bauxite in parts by mass, wherein the parts by mass of the components are as follows: 38 parts of solid block, 42 parts of basalt, 16 parts of dolomite and 4 parts of bauxite; mixing and homogenizing for many times, and feeding into a melting furnace; melting the mixture into magma at 1800 ℃; the rock slurry flows out from a siphon port of the melting furnace, is thrown into rock wool fibers under the high-speed centrifugal action of a four-roller centrifugal machine, and is sprayed with 120 parts of binder, 1.9 parts of water repellent and 1.2 parts of dustproof oil;
s5: collecting the rock wool fibers spun in the step S4 on a cotton collecting screen plate of a cotton collecting machine under the dual functions of blowing-off air and negative pressure air; utilizing a pendulum to lay the collected rock wool fibers into rock wool fiber layers with a multi-layer loose structure; laminating the rock wool fibers into a three-dimensional fiber structure by using a three-dimensional pleating machine;
s6: curing and forming the pressed rock wool in a curing furnace at the curing temperature of 150 ℃ to prepare the new rock wool and ensure that the chemical components of the new rock wool comprise SiO2、Al2O3、CaO、MgO。
The results of the tests on rock wool produced from recycled waste are shown in table 3:
TABLE 3
Comparative example 1
S1: crushing and screening the untreated agricultural waste rock wool and the slag, cutting scraps or recovered waste materials formed by old rock wool removed by building disassembly in the production and use process of the rock wool to ensure that the average particle size is 20mm, wherein the waste agricultural rock wool contains one amount of moisture and residual root system;
s2: cement with strength grade 42.5R and recycled waste were mixed according to 7: 1, adding a small amount of water according to the weight proportion, uniformly stirring, pressing into a cylinder with the height of 100mm and the diameter of 100mm, and in the pressing process, because the root system is remained in the agricultural waste rock wool and a large amount of water is separated out from the large rock wool, the slurry is separated, and the obtained waste material block is basically not formed.
Comparative example 2
S1: crushing and screening the untreated agricultural waste rock wool and the recovered waste material formed by slag, cutting scraps or old rock wool removed and eliminated by building disassembly in the production and use process of the rock wool to ensure that the average particle size is 20mm, wherein the waste agricultural rock wool contains one amount of moisture and residual root system, and the mass ratio of the water content is more than 90%;
s2: strength grade 42.5 cement and recycled waste were mixed as 5: 2, adding a proper amount of water in the weight ratio, stirring for 6min to uniformly mix the materials, pressing the materials into a cylinder with the height of 100mm and the diameter of 100mm, and curing and solidifying the cement thoroughly; through a simulation melting furnace for feeding materials, a free falling body experiment from a high place (about 2 meters) shows that a part of waste material blocks are seriously crushed and even become powder particles, the leaked rock wool part still has root systems and water, and the waste material blocks are not damaged for later use;
s3: weighing the solid block prepared by the step S2, basalt, dolomite and bauxite in parts by mass, wherein the parts by mass of the components are as follows: 38 parts of solid block, 42 parts of basalt, 17 parts of dolomite and 3 parts of bauxite; mixing and homogenizing for many times, and feeding into a melting furnace; melting the mixture into magma at 1800 ℃; the rock slurry flows out from a siphon port of the melting furnace, is thrown into rock wool fibers under the high-speed centrifugal action of a four-roller centrifugal machine, and is sprayed with 122 parts of binder, 1.6 parts of water repellent and 1.3 parts of dustproof oil;
s4: collecting the rock wool fibers spun in the step S3 on a cotton collecting screen plate of a cotton collecting machine under the dual functions of blowing-off air and negative pressure air; utilizing a pendulum to lay the collected rock wool fibers into rock wool fiber layers with a multi-layer loose structure; laminating the rock wool fibers into a three-dimensional fiber structure by using a three-dimensional pleating machine;
s5: curing and forming the pressed rock wool in a curing furnace at the curing temperature of 150 ℃ to prepare the new rock wool and ensure that the chemical components of the new rock wool comprise SiO2、Al2O3、CaO、MgO。
The results of the tests on rock wool produced from recycled waste are shown in table 4:
TABLE 4
The product prepared by the comparative example 2 is not durable and can not reach the parameters required by agricultural rock wool.
Claims (10)
1. A method for treating and recycling waste agricultural rock wool comprises the following raw material components: the method specifically comprises the following steps:
s1: treating a precursor: firstly, cutting waste agricultural rock wool into blocks, effectively destroying a film integrally coated by the agricultural rock wool, squeezing water in the waste agricultural rock wool by using a press, and finally drying the waste agricultural rock wool by using a drying furnace to ensure that the water content of broken rock wool residues is not more than 1%;
s2: calcining the dried waste rock wool residue in a high-temperature furnace, removing organic resins such as plant root systems, fiber attachments and the like contained in the waste agricultural rock wool, ensuring that the content of organic matters in the rock wool residue is not more than 0.5%, wherein the heat for calcining is derived from carbon monoxide generated by a melting furnace, fully combusting in an incinerator, and recovering waste heat;
s3: crushing the precursor obtained in the step S2, mixing the precursor with cement according to the mass ratio of 5:1-8:1, adding a proper amount of water, uniformly stirring, pressing into blocks, curing and drying for later use;
s4: weighing the solid block prepared by S3, basalt, dolomite and bauxite, wherein the mass parts of the components are respectively as follows: 38-41 parts of solid block, 42-44 parts of basalt, 16-19 parts of dolomite and 4-7 parts of bauxite; mixing and homogenizing for many times, and feeding into a melting furnace; after the mixture is melted into magma, the magma flows out from a siphon port of the melting furnace, and is thrown into rock wool fibers under the high-speed centrifugal action of a four-roller centrifugal machine, and at the same time, 130 parts of adhesive, 1.5-2.0 parts of water repellent and 1.2-1.5 parts of dustproof oil are sprayed;
s5: collecting the rock wool fibers spun in the step S4 on a cotton collecting screen plate of a cotton collecting machine under the dual functions of blowing-off air and negative pressure air; utilizing a pendulum to lay the collected rock wool fibers into rock wool fiber layers with a multi-layer loose structure; laminating the rock wool fibers into a three-dimensional fiber structure by using a three-dimensional pleating machine;
s6: the pressed rock wool is put into a curing furnace for curing and forming, the curing temperature is 150-250 ℃, and the chemical components of the obtained rock wool comprise SiO2、Al2O3、CaO、MgO。
2. The method for treating and recycling waste agricultural rock wool according to claim 1, wherein the method comprises the following steps: the size of the blocks cut by the waste agricultural rock wool in the step S1 is not more than 500 mm; the temperature of the drying furnace is set to be 150-400 ℃, and the heat for drying is derived from the waste heat generated by the multistage heat exchanger, the waste heat generated by the curing furnace and the waste heat generated by the high-temperature furnace.
3. The method for treating and recycling waste agricultural rock wool according to claim 1 or 2, wherein the method comprises the following steps: the heat of the drying oven used in step S1 comes from three ways: after carbon monoxide generated by the melting furnace is fully combusted in the incinerator, waste heat is exchanged by the multi-stage heat exchanger; the burner generates heat and the waste heat after passing through the rock wool curing furnace; after organic resins such as plant roots, fiber attachments and the like contained in the agricultural rock wool are incinerated by the high-temperature furnace, the waste heat of tail gas is recovered.
4. The method for treating and recycling waste agricultural rock wool according to any one of claims 1 to 3, wherein the method comprises the following steps: the temperature range of the high-temperature furnace incineration in the step S2 is 500-900 ℃; the temperature range of melting the mixture into magma in the step S4 is 1400-1800 ℃.
5. The method for treating and recycling waste agricultural rock wool according to claim 4, wherein the method comprises the following steps: the heat of the high-temperature furnace is derived from the waste heat of the tail of the incinerator, and the heat of the incinerator is derived from the full combustion of carbon monoxide tail gas generated by a melting furnace for producing rock wool in the incinerator; the heat of a drying furnace for drying the waste agricultural rock wool and a high-temperature furnace for burning root systems and organic matters are both from waste heat recovery.
6. The method for treating and recycling waste agricultural rock wool according to claim 5, wherein the method comprises the following steps: the waste heat of the pretreatment of the waste agricultural rock wool in the step S2 comes from the production process of rock wool, different heat gradients are generated, the waste heat in the low-temperature section is used for drying the waste agricultural rock wool, and the waste heat in the high-temperature section is used for burning root systems and organic matters in the waste agricultural rock wool.
7. The method for treating and recycling waste agricultural rock wool according to any one of claims 1 to 6, wherein the method comprises the following steps: the size of the broken rock wool pieces obtained in the step S3 is not greater than 40 mm.
8. The method for treating and recycling waste agricultural rock wool according to any one of claims 1 to 7, wherein the method comprises the following steps: the binder used in step S4 is a phenolic resin.
9. The method for treating and recycling waste agricultural rock wool according to any one of claims 1 to 8, wherein the method comprises the following steps: the chemical components of the waste agricultural rock wool comprise SiO2、Al2O3CaO, MgO, and SiO in an amount of 100% by weight of the total chemical composition2The mass fraction is as follows: 42 to 48 percent; al (Al)2O3The mass fraction of is as follows: 13 to 18 percent; the CaO comprises the following components in percentage by mass: 15 to 23 percent; the mass fraction of MgO is 8-13%.
10. An agricultural rock wool prepared by the method for treating and reusing waste agricultural rock wool according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185133A (en) * | 2021-04-16 | 2021-07-30 | 宁夏领航岩棉科技有限公司 | Waste rock wool capable of being recycled and regenerated for secondary time and production process thereof |
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| JPH0656474A (en) * | 1992-07-31 | 1994-03-01 | Nippon Steel Chem Co Ltd | Feedstock for producing rock wool |
| CN103922641A (en) * | 2014-04-28 | 2014-07-16 | 河北金源建材科技有限公司 | Composition and method for preparing novel farm-oriented rock wool |
| CN107337353A (en) * | 2017-08-30 | 2017-11-10 | 惠州市嘉良保温材料有限公司 | A kind of environmentally friendly rock wool and the production method of environmentally friendly rock wool |
| CN107827366A (en) * | 2017-12-14 | 2018-03-23 | 威海博盛新材料有限公司 | A kind of rock wool prepared using recovery waste material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0656474A (en) * | 1992-07-31 | 1994-03-01 | Nippon Steel Chem Co Ltd | Feedstock for producing rock wool |
| CN103922641A (en) * | 2014-04-28 | 2014-07-16 | 河北金源建材科技有限公司 | Composition and method for preparing novel farm-oriented rock wool |
| CN107337353A (en) * | 2017-08-30 | 2017-11-10 | 惠州市嘉良保温材料有限公司 | A kind of environmentally friendly rock wool and the production method of environmentally friendly rock wool |
| CN107827366A (en) * | 2017-12-14 | 2018-03-23 | 威海博盛新材料有限公司 | A kind of rock wool prepared using recovery waste material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113185133A (en) * | 2021-04-16 | 2021-07-30 | 宁夏领航岩棉科技有限公司 | Waste rock wool capable of being recycled and regenerated for secondary time and production process thereof |
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Application publication date: 20210326 |