CN113831010A - Method for preparing mineral wool by using plasma molten ash - Google Patents
Method for preparing mineral wool by using plasma molten ash Download PDFInfo
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- CN113831010A CN113831010A CN202111239878.7A CN202111239878A CN113831010A CN 113831010 A CN113831010 A CN 113831010A CN 202111239878 A CN202111239878 A CN 202111239878A CN 113831010 A CN113831010 A CN 113831010A
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- 239000011490 mineral wool Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002893 slag Substances 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 44
- 239000010881 fly ash Substances 0.000 claims abstract description 39
- 239000002956 ash Substances 0.000 claims abstract description 30
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 27
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 229920000742 Cotton Polymers 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 11
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 11
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 11
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 238000000889 atomisation Methods 0.000 claims abstract description 4
- 238000002407 reforming Methods 0.000 claims abstract description 4
- 238000009987 spinning Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 33
- 239000002920 hazardous waste Substances 0.000 claims description 24
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 8
- 239000010813 municipal solid waste Substances 0.000 claims description 7
- 239000000440 bentonite Substances 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002910 solid waste Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 21
- 238000004056 waste incineration Methods 0.000 description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 13
- 239000000460 chlorine Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 125000001309 chloro group Chemical class Cl* 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- -1 etc. Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M potassium chloride Inorganic materials [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- 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 provides a method for preparing mineral wool by using plasma molten ash, which comprises the following steps: s1, material preparation and mixing: mixing fly ash and bottom slag to obtain a mixed material, wherein the acidity coefficient of the mixed material meets Mk=(SiO2+Al2O3) /(CaO + MgO) = 1.24-2.72; s2, melting by using a plasma furnace: adding the mixed material obtained in the step S1 into a plasma furnace, and melting to obtain liquid slag; s3, multi-roller centrifugal blowing is carried out to form fiber and collect cotton: the liquid slag obtained in the step S2 is led into a multi-roller centrifugal spinning fiberizer, a binding agent is added through multi-point atomization, fibers are obtained through drafting, and the fibers are sent to a cotton collecting machine to obtain a cotton felt; s4, hot air curing and reforming: pressurizing the cotton felt obtained in the step S3 in a curing furnace, blowing hot air into the curing furnace, and curing the hot air through the felt layer to obtain the mineral wool. The invention realizes the synergistic harmless treatment and high added value of the solid waste between the environmental protection and the metallurgy industriesThe resource utilization is realized.
Description
Technical Field
The invention belongs to the technical field of hazardous waste disposal, and particularly relates to a method for preparing mineral wool by using plasma molten ash.
Background
With the rapid development of urbanization in China, domestic household garbage incineration and hazardous waste incineration industries are rapidly developed. Annual production of incineration fly ash of domestic garbage, incineration fly ash of hazardous waste and bottom slag has exceeded ten million tons and increased year by year. Since fly ash (incineration fly ash of household garbage and incineration fly ash of hazardous waste) contains heavy metals and dioxin, and incineration bottom slag of hazardous waste contains heavy metals, both of them belong to hazardous waste (waste class HW 18), and must be subjected to harmless treatment.
At present, the main disposal means of the ash residue is landfill, and the landfill disposal can not effectively solve the pollution of dioxin and heavy metal, and the risk of secondary escape exists for a long time to cause environmental pollution; moreover, the landfill occupies a large amount of land resources, and the problem of land-free landfill is faced in developed areas. With the practice of the green ecological construction concept, the resource utilization is the final way to solve the ash.
The existing resource utilization method of waste incineration fly ash or hazardous waste incineration ash mainly comprises the steps of preparing glass-state slag, cement, microcrystalline glass, heat-preservation mineral wool and the like, wherein the glass-state slag, the cement and other building materials have low resource product added value; the added values of the microcrystalline glass and the heat-insulating mineral wool are relatively high, and the treatment cost of the ash slag is favorably reduced. The reported problems of high waste glass adding proportion, high melting temperature, high disposal cost and the like in the mineral wool prepared by melting waste incineration fly ash.
Disclosure of Invention
In order to solve the technical problems that the ash landfill easily causes environmental pollution and occupies land resources, the invention provides a method for preparing mineral wool by melting ash through plasma.
A method for preparing mineral wool by using plasma molten ash, comprising the following steps:
s1, batching and mixing: mixing fly ash and bottom slag to obtain a mixed material, wherein the acidity coefficient of the mixed material meets Mk=(SiO2+Al2O3) /(CaO + MgO) =1.24-2.72, wherein the acidity coefficient is SiO in the mixed material2、Al2O3The ratio of the sum of the masses of CaO and MgO meets the acidity coefficient standard requirement of mineral wool specified by the state;
s2, melting by using a plasma furnace: adding the mixed material obtained in the step S1 into a plasma furnace, and melting to obtain liquid slag;
s3, multi-roller centrifugal blowing is carried out to form fiber and collect cotton: the liquid slag obtained in the step S2 is led into a multi-roller centrifugal spinning fiberizer, a binding agent is added through multi-point atomization, fibers are obtained through drafting, and the fibers are sent to a cotton collecting machine to obtain a cotton felt;
s4, hot air curing and reforming: pressurizing the cotton felt obtained in the step S3 in a curing furnace, blowing hot air into the curing furnace, and curing the hot air through the felt layer to obtain the mineral wool.
Further, the fly ash in step S1 is garbage fly ash or hazardous waste fly ash.
Further, in the step S1, iron-containing dust and mud are added to the mixture as an iron source, and the iron-containing dust and mud is used for providing iron oxide to the mixture, so that on one hand, the heat resistance of the mineral wool is increased, and the use temperature of the mineral wool is increased; in addition, when the acidity coefficient is high, the addition of the ferric oxide can obviously reduce the viscosity of the molten slag, improve the fluidity of the molten slag and form fiber smoothly, the melting process can be carried out at a lower temperature, the energy consumption is reduced, the addition of the iron-containing dust mud is beneficial to reducing the melting temperature of the melt by 70-130 ℃, and simultaneously, the maximum use temperature of the mineral wool can be increased by about 200-300 ℃; .
Further, the mixed material in the step S1 mainly comprises 13-25 parts of CaO and 25-40 parts of SiO25-11 parts of Al2O33-6 parts of MgO and 3-15 parts of Fe2O3。
Further, in the step S2, the mixed material is melted at 1250-1500 ℃, and the temperature of the molten pool is controlled by adjusting the input power of the plasma furnace, so that the viscosity of the liquid slag is maintained at 1-3 Pa.s, and the viscosity range is favorable for smooth fiber formation of the slag.
Further, the multi-roller centrifugal filament-throwing fiberizer of step S3 is a four-roller centrifuge, the flow rate of the molten slag during operation is 2-3t/h, and the rotation speeds of the rollers are respectively: 3500r/min for the first roller 2800-.
Furthermore, the adding amount of the binder in the step S3 accounts for 3-4% of the total mass of the liquid slag.
Further, the binder in step S3 is an inorganic binder, and includes water glass, aluminum sulfate or bentonite.
Further, the temperature of the hot air in the step S4 is 220-250 ℃.
The invention has the beneficial effects that:
(1) CaO in fly ash (waste incineration fly ash or hazardous waste incineration fly ash) is used for providing a calcium source of mineral wool, SiO2 and Al2O3 in hazardous waste incineration bottom slag are used for providing a silicon source and an aluminum source of the mineral wool, Fe2O3 in iron-containing dust mud is used for providing an iron oxide source, and the proportion is adjusted based on multiple oxides in various solid wastes to meet the component requirement of the mineral wool;
(2) the iron-containing dust mud is utilized to increase the content of ferric oxide in the mixture, so that the melting temperature of the mineral wool melt under high acidity coefficient is reduced, and the energy consumption is saved; meanwhile, the increase of the content of the ferric oxide can also improve the maximum use temperature of the mineral wool by about 200-300 ℃;
(3) realizes the synergistic harmless treatment and high value-added resource utilization of the solid waste between the environmental protection and the metallurgy industries.
Drawings
FIG. 1 is a schematic view of the process for the production of mineral wool according to the invention.
Detailed Description
The present invention is further described with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the claims, and other alternatives which may occur to those skilled in the art are also within the scope of the claims.
The oxide of the waste incineration fly ash or the hazardous waste incineration fly ash is CaO and SiO2、Al2O3、MgO、Fe2O3Etc., Na, K and Cl are mainly NaCl, KCl and CaCl2Equal chlorine salt, wherein CaO of the garbage fly ash is about 45 percent, and the chlorine salt is about 25 percent; the CaO content of the hazardous waste incineration fly ash is about 35 percent, and the chlorine salt content is about 30 percent. The oxide in the hazardous waste incineration bottom slag is CaO and SiO2、Al2O3、MgO、Fe2O3、TiO2、K2O and Na2O, etc., SiO2About 45% or so, Al2O3About 5-15%. The main oxide of the iron-containing sludge is Fe2O3、CaO、SiO2、Al2O3MgO, etc., wherein Fe2O3About 60-90%, CaO about 5-8%, SiO2About 1-5%, Al2O3About 1-3% of MgO and about 1-3% of MgO. The invention provides a calcium source for mineral wool by using garbage fly ash or dangerous waste fly ash, provides a silicon source and an aluminum source for the mineral wool by using dangerous waste bottom slag, and mainly provides iron oxide for the mineral wool by using iron-containing dust mud.
Example 1
A method for preparing mineral wool by using plasma molten ash, comprising the following steps:
s1, material preparation and mixing: mixing 45 parts of hazardous waste fly ash and 55 parts of bottom slag to obtain a mixed material, wherein the weight parts of CaO and SiO are 22.9 parts225.5 parts of Al2O36.8 parts of MgO, 3.2 parts of Fe2O3Is 2.9 parts, K23.5 portions of O and Na211.4 parts of O, 12.8 parts of Cl and TiO22.0 parts of the mixed material, and the acidity coefficient of the mixed material meets Mk=(SiO2+Al2O3) /(CaO + MgO) =1.24, where the acidity coefficient is SiO in the mixture2、Al2O3The ratio of the sum of the masses of CaO and MgO.
S2, melting by using a plasma furnace: and (4) adding the mixed material obtained in the step (S1) into a plasma furnace, melting for 2 hours at 1350 ℃ to obtain liquid slag, and controlling the temperature of a molten pool by adjusting the input power of the plasma furnace to maintain the viscosity of the liquid slag at 1.5 Pa.s.
S3, multi-roller centrifugal blowing is carried out to form fiber and collect cotton: and (2) guiding the liquid slag obtained in the step (S2) into a four-roller centrifugal spinning fiberizer, adding 3% inorganic binder water glass through multi-point atomization, drafting to obtain fibers, and sending the fibers to a cotton collector to obtain a cotton felt, wherein the flow rate of the slag is 2.5t/h when the fiberizer works, and the rotating speed of each roller is respectively as follows: 3000r/min for the first roller, 4500r/min for the second roller, 5500r/min for the third roller and 5500r/min for the fourth roller.
S4, hot air curing and reforming: and (5) pressurizing the cotton felt obtained in the step (S3) in a curing furnace, blowing hot air at the temperature of 220-250 ℃, and curing the hot air through the felt layer to obtain the mineral wool.
Example 2
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 35 parts of waste incineration fly ash and 65 parts of bottom slag to obtain a mixed material, wherein 23.9 parts of CaO and SiO are mixed according to the mass part ratio231.1 parts of Al2O39.3 parts of MgO, 4.0 parts of Fe2O3Is 3.4 parts, K24.0 parts of O and Na25.9 parts of O, 8.6 parts of Cl and TiO22.4 portions, and the acidity coefficient M of the mixed materialk=1.45。
In step S2, the slag viscosity is 2.3 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2t/h, and the rotating speeds of the rollers are respectively as follows: a first roller 3300r/min, a second roller 4700r/min, a third roller 5800r/min and a fourth roller 5800 r/min.
Example 3
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 35 parts of hazardous waste fly ash and 65 parts of bottom slag to obtain a mixed material, wherein the weight parts of CaO and SiO are 20.4 parts229.9 parts of Al2O38.0 parts of MgO, 3.7 parts of Fe2O3Is 3.3 parts of K23.4 portions of O and Na210.0 parts of O, 10.4 parts of Cl and TiO22.3 portions, the acidity coefficient M of the mixed materialk=1.57。
In step S2, the molten steel was melted at 1330 ℃ and the slag viscosity was 1 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 3t/h, and the rotating speeds of the rollers are respectively as follows: 3500r/min of a first roller, 5000r/min of a second roller, 6000r/min of a third roller and 7000r/min of a fourth roller.
In step S3, 4% inorganic binder water glass is added.
Example 4
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 25 parts of waste incineration fly ash and 75 parts of bottom slag to obtain a mixed material, wherein the weight parts of CaO and SiO are 20.4 parts235.2 parts of Al2O310.1 parts of MgO, 4.5 parts of Fe2O3Is 3.8 parts, K23.7 portions of O and Na25.7 parts of O, 6.8 parts of Cl and TiO22.7 portions, and the acidity coefficient M of the mixed materialk=1.82。
In step S2, the molten steel was melted at 1350 ℃ and the slag viscosity was 2.4 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2.5t/h, and the rotating speeds of the rollers are respectively as follows: the first roller 2800r/min, the second roller 4000r/min, the third roller 5000r/min and the fourth roller 5500 r/min.
In step S3, 3% of aluminum sulfate as an inorganic binder was added.
Example 5
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 20 parts of hazardous waste fly ash and 80 parts of bottom slag to obtain a mixed material, wherein the weight parts of CaO and SiO are 16.6 parts236.5 parts of Al2O39.8 parts of MgO, 4.5 parts of Fe2O3Is 4.0 parts, K23.2 portions of O and Na27.9 parts of O, 6.8 parts of Cl and TiO22.8 portions, the acidity coefficient M of the mixed materialk=2.19。
In step S2, the molten steel was melted at 1450 ℃ and the slag viscosity was 2.7 pas.
In step S3, 4% of aluminum sulfate as an inorganic binder was added.
Example 6
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 15 parts of hazardous waste fly ash and 85 parts of bottom slag to obtain a mixed material, wherein the weight parts of CaO and SiO are 15.3 parts238.7 parts of Al2O310.4 parts of MgO, 4.8 parts of Fe2O3Is 4.2 parts, K23.2 portions of O and Na27.2 parts of O, 5.7 parts of Cl and TiO23.0 parts of the mixed material, and the acidity coefficient M of the mixed materialk=2.44。
In step S2, the molten steel is melted at 1480 ℃ and the slag viscosity is 3 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2t/h, and the rotating speeds of the rollers are respectively as follows: a first roller 3300r/min, a second roller 4700r/min, a third roller 5800r/min and a fourth roller 5800 r/min.
In step S3, 3% of an inorganic binder bentonite is added.
Example 7
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, 10 parts of hazardous waste fly ash and 90 parts of bottom slag are mixed to obtain a mixed material, wherein the weight parts of CaO and SiO are 14.0 parts240.9 parts of Al2O311.0 parts of MgO, 5.1 parts of Fe2O3Is 4.4 parts, K23.1 portions of O and Na26.5 parts of O, 4.5 parts of Cl and TiO23.2 portions, and the acidity coefficient M of the mixed materialk=2.72。
In step S2, the molten steel was melted at 1500 ℃ and the slag viscosity was 2.6 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2t/h, and the rotating speeds of the rollers are respectively as follows: a first roller 3300r/min, a second roller 4700r/min, a third roller 5800r/min and a fourth roller 5800 r/min.
In step S3, 4% of an inorganic binder bentonite is added.
Example 8
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 25 parts of waste incineration fly ash, 75 parts of bottom slag and 10 parts of iron-containing dust to obtain a mixed material, wherein the mixed material comprises 19.2 parts of CaO and SiO by mass232.2 parts of Al2O39.4 parts of MgO, 4.3 parts of Fe2O310.7 parts of K23.4 portions of O and Na25.2 parts of O, 6.2 parts of Cl and TiO22.5 portions, and the acidity coefficient M of the mixed materialk=1.77。
In step S2, the molten steel is melted at 1280 ℃ and the slag viscosity is 1.7 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2.5t/h, and the rotating speeds of the rollers are respectively as follows: the first roller 2800r/min, the second roller 4000r/min, the third roller 5000r/min and the fourth roller 5500 r/min.
In step S3, 3% of aluminum sulfate as an inorganic binder was added.
Example 9
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 35 parts of hazardous waste fly ash, 65 parts of bottom slag and 12 parts of iron-containing dust to obtain a mixed material, wherein the weight parts of CaO and SiO are 19.1 parts227.0 parts of Al2O37.3 parts of MgO, 3.6 parts of Fe2O311.5 parts of K23.1 portions of O and Na29.0 parts of O, 9.3 parts of Cl and TiO22.1 portions, and the acidity coefficient M of the mixed materialk=1.51。
In step S2, the molten steel is melted at 1250 ℃ and the viscosity of the slag is 1.5 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 3t/h, and the rotating speeds of the rollers are respectively as follows: 3500r/min of a first roller, 5000r/min of a second roller, 6000r/min of a third roller and 7000r/min of a fourth roller.
In step S3, 4% inorganic binder water glass is added.
Example 10
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 1, except that:
step S1, mixing 15 parts of hazardous waste fly ash, 85 parts of bottom slag and 10 parts of iron-containing dust to obtain a mixed material, wherein the weight parts of CaO and SiO are 14.5 parts234.8 parts of Al2O39.5 parts of MgO, 4.6 parts of Fe2O3Is 12.3 portions of K22.8 portions of O and Na26.4 parts of O, 5.0 parts of Cl and TiO22.7 portions, and the acidity coefficient M of the mixed materialk=2.32。
In step S2, the molten steel was melted at 1350 ℃ and the slag viscosity was 1.7 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2t/h, and the rotating speeds of the rollers are respectively as follows: a first roller 3300r/min, a second roller 4700r/min, a third roller 5800r/min and a fourth roller 5800 r/min.
In step S3, 3% of an inorganic binder bentonite is added.
Example 11
A process for the preparation of mineral wool using plasma melted ash, the procedure being essentially the same as in example 2, except that:
step S1, mixing 10 parts of hazardous waste fly ash, 90 parts of bottom slag and 15 parts of iron-containing dust to obtain a mixed material, wherein the weight parts of CaO and SiO are 13.2 parts235.9 parts of Al2O39.8 portions of MgO, 4.8 portions of Fe2O3Is 14.2 parts, K22.7 portions of O and Na25.7 parts of O, 3.9 parts of Cl and TiO22.8 portions, the acidity coefficient M of the mixed materialk=2.54。
In step S2, the molten steel was melted at 1500 ℃ and the slag viscosity was 2.6 pas.
In step S3, the flow rate of the molten slag of the fiber forming machine in work is 2t/h, and the rotating speeds of the rollers are respectively as follows: a first roller 3300r/min, a second roller 4700r/min, a third roller 5800r/min and a fourth roller 5800 r/min.
In step S3, 4% of an inorganic binder bentonite is added.
According to the national standards GB/T25975-:
from the examples and the table above, it can be seen that:
(1) CaO in fly ash (waste incineration fly ash or hazardous waste incineration fly ash) is used for providing a calcium source of mineral wool, and SiO in hazardous waste incineration bottom slag2、Al2O3Providing mineralsSilicon and aluminium sources of cotton, Fe in iron-containing dust2O3Provides an iron oxide source, adjusts the proportion based on the multi-component oxide in various solid wastes, and meets the component requirement of the mineral wool. The mineral wool acidity coefficient is between 1.24 and 2.72, the heat conductivity coefficient is between 0.025 and 0.040W/(m.K), and the volume weight is between 76 and 105 Kg/m3The highest using temperature can reach 895 ℃, and the using standard of related mineral wool is met. The mineral wool with the acidity coefficient of less than 1.6 can be processed into various products such as boards, pipes, felts, belts, paper and the like, and can be used for heat insulation, fire prevention, sound absorption, earthquake resistance and the like of industrial equipment, pipelines and kilns. The mineral wool with acidity coefficient more than 1.6 is made into products such as rock wool boards, rock wool felts, rock wool pipe shells and the like according to different purposes, and is applied to heat insulation, fire prevention, sound absorption, earthquake resistance and the like of buildings, industrial equipment, pipelines and kilns.
(2) By comparing the example 3 with the example 9, the example 4 with the example 8, the example 6 with the example 10, and the example 7 with the example 11, the iron oxide content in the mixture is adjusted by using the iron-containing dust mud, the melting temperature of the mixture can be reduced by about 70-130 ℃ when the acidity coefficient is high, and the energy consumption is saved; the content of ferric oxide in the mixture is increased to 10-14%, and the maximum heat-resisting temperature of the mineral wool is increased by 200-300 ℃.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A method for preparing mineral wool by using plasma molten ash is characterized in that: the method comprises the following steps:
s1, material preparation and mixing: mixing fly ash and bottom slag to obtain a mixed material, wherein the acidity coefficient of the mixed material meets Mk=(SiO2+Al2O3) /(CaO + MgO) =1.24-2.72, wherein the acidity coefficient is SiO in the mixed material2、Al2O3The ratio of the mass sum of (a) to the mass sum of CaO and MgO;
s2, melting by using a plasma furnace: adding the mixed material obtained in the step S1 into a plasma furnace, and melting to obtain liquid slag;
s3, multi-roller centrifugal blowing is carried out to form fiber and collect cotton: the liquid slag obtained in the step S2 is led into a multi-roller centrifugal spinning fiberizer, a binding agent is added through multi-point atomization, fibers are obtained through drafting, and the fibers are sent to a cotton collecting machine to obtain a cotton felt;
s4, hot air curing and reforming: pressurizing the cotton felt obtained in the step S3 in a curing furnace, blowing hot air into the curing furnace, and curing the hot air through the felt layer to obtain the mineral wool.
2. The method for preparing mineral wool using plasma melted ash as claimed in claim 1, wherein: the fly ash of step S1 is garbage fly ash or hazardous waste fly ash.
3. The method for preparing mineral wool using plasma melted ash as claimed in claim 1, wherein: in step S1, iron-containing dust and mud is added to the mixture as an iron source.
4. The method for preparing mineral wool using plasma melted ash as claimed in claim 1 or 3, wherein: the mixed material of the step S1 comprises 13-25 parts of CaO and 25-40 parts of SiO according to the mass part ratio25-11 parts of Al2O33-6 parts of MgO and 3-15 parts of Fe2O3。
5. The method for preparing mineral wool using plasma melted ash as claimed in claim 1, wherein: in step S2, the mixed material is melted at 1250-1500 ℃, and the temperature of the molten pool is controlled by adjusting the power of the plasma furnace, so that the viscosity of the liquid slag is maintained at 1-3 Pa.s.
6. The method for preparing mineral wool using plasma melted ash as claimed in claim 1, wherein: the multi-roller centrifugal melt-spun fiberizer of the step S3 is a four-roller centrifuge, the flow rate of the slag is 2-3t/h when in work, and the rotating speed of each roller is respectively as follows: 3500r/min for the first roller 2800-.
7. The method for preparing mineral wool using plasma melted ash as claimed in claim 1, wherein: in the step S3, the adding amount of the binder accounts for 3-4% of the total mass of the liquid slag.
8. The method for preparing mineral wool using plasma melted ash as claimed in claim 1 or 7, wherein: the binder in the step S3 is an inorganic binder, and comprises water glass, aluminum sulfate or bentonite.
9. The method for preparing mineral wool using plasma melted ash as claimed in claim 1, wherein: the temperature of the hot air in the step S4 is 220-250 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114538785A (en) * | 2022-04-02 | 2022-05-27 | 郑州大学 | Method for preparing mineral wool by high-temperature melting of phosphogypsum and mineral wool |
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Application publication date: 20211224 |