CN117229040B - Fly ash-based grouting material containing invalid rare earth polishing powder, and preparation method and application thereof - Google Patents
Fly ash-based grouting material containing invalid rare earth polishing powder, and preparation method and application thereof Download PDFInfo
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- CN117229040B CN117229040B CN202311499052.3A CN202311499052A CN117229040B CN 117229040 B CN117229040 B CN 117229040B CN 202311499052 A CN202311499052 A CN 202311499052A CN 117229040 B CN117229040 B CN 117229040B
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- 239000000843 powder Substances 0.000 title claims abstract description 125
- 238000005498 polishing Methods 0.000 title claims abstract description 110
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 105
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 104
- 239000010881 fly ash Substances 0.000 title claims abstract description 101
- 239000000463 material Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000012798 spherical particle Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 19
- 239000011230 binding agent Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 16
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 11
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 8
- 239000011812 mixed powder Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000000498 ball milling Methods 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000001694 spray drying Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- 239000001667 (E)-4-furan-2-ylbut-3-en-2-one Substances 0.000 claims description 2
- GBKGJMYPQZODMI-SNAWJCMRSA-N (e)-4-(furan-2-yl)but-3-en-2-one Chemical compound CC(=O)\C=C\C1=CC=CO1 GBKGJMYPQZODMI-SNAWJCMRSA-N 0.000 claims description 2
- 229920000877 Melamine resin Polymers 0.000 claims description 2
- 239000005062 Polybutadiene Substances 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- KGWWEXORQXHJJQ-UHFFFAOYSA-N [Fe].[Co].[Ni] Chemical compound [Fe].[Co].[Ni] KGWWEXORQXHJJQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims description 2
- SLGWESQGEUXWJQ-UHFFFAOYSA-N formaldehyde;phenol Chemical compound O=C.OC1=CC=CC=C1 SLGWESQGEUXWJQ-UHFFFAOYSA-N 0.000 claims description 2
- ANAGEECPKFGKEL-UHFFFAOYSA-N furan-2-carbaldehyde;phenol Chemical compound OC1=CC=CC=C1.O=CC1=CC=CO1 ANAGEECPKFGKEL-UHFFFAOYSA-N 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 229920002857 polybutadiene Polymers 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 239000002699 waste material Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 229910000420 cerium oxide Inorganic materials 0.000 description 8
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 8
- 239000011083 cement mortar Substances 0.000 description 7
- 238000004064 recycling Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- -1 phenolic aldehyde Chemical class 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 description 2
- 229910003447 praseodymium oxide Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 102220042174 rs141655687 Human genes 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- ONLCZUHLGCEKRZ-UHFFFAOYSA-N cerium(3+) lanthanum(3+) oxygen(2-) Chemical compound [O--].[O--].[O--].[La+3].[Ce+3] ONLCZUHLGCEKRZ-UHFFFAOYSA-N 0.000 description 1
- LPAWMRUUNWKLMO-UHFFFAOYSA-N cerium(3+) lanthanum(3+) oxygen(2-) praseodymium(3+) Chemical compound [O-2].[Pr+3].[Ce+3].[La+3] LPAWMRUUNWKLMO-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a fly ash-based grouting material containing invalid rare earth polishing powder, a preparation method and application thereof, and the fly ash-based grouting material comprises fly ash, invalid rare earth polishing powder and an adhesive, wherein the adhesive accounts for 20% -42% of the total mass of the fly ash, the invalid rare earth polishing powder and the adhesive, the invalid rare earth polishing powder accounts for 6% -12% of the total mass of the fly ash and the invalid rare earth polishing powder, and the microscopic morphology of the invalid rare earth polishing powder is spherical particles. Compared with the conventional grouting material, the heat conductivity of the fly ash-based grouting material containing the invalid rare earth polishing powder is reduced by more than 20%, and the heat insulation property is strong.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a fly ash-based grouting material containing ineffective rare earth polishing powder, a preparation method and application thereof.
Background
Rare earth polishing powder in China is used in an amount of 4-5 ten thousand tons each year, and currently, rare earth polishing powder applied in a large amount is mainly divided into three types, namely cerium oxide polishing powder, lanthanum cerium oxide polishing powder and lanthanum cerium praseodymium oxide polishing powder. The rare earth polishing material is widely applied to the polishing fields of optical glass, liquid crystal glass substrates, mobile phone cover plate glass and the like. However, the rare earth polishing powder which is ineffective after polishing is converted into waste polishing powder, and the content of rare earth oxide in the waste rare earth polishing powder is generally more than 40%, and the waste rare earth polishing powder also contains silicon oxide, aluminum oxide, calcium oxide, fluorine, a small amount of magnesium oxide, ferric oxide, titanium oxide, zirconium oxide and other impurities. At present, the treatment method of the waste rare earth polishing powder mostly adopts piling or direct landfill, which not only occupies the land, but also causes rare earth resource waste and environmental pollution.
Most of enterprises at home and abroad still exist in the laboratory research stage for recycling the waste rare earth polishing powder, for example, patent CN 103215012B invents a method for recycling the rare earth polishing powder by adopting a reselection method, and the recycling of the waste rare earth polishing powder is realized; japanese patent JP11319755 proposes a method of treating waste rare earth polishing powder with a large amount of hydrofluoric acid. There are some reports of recycling rare earth elements in waste rare earth polishing powder by adopting physical and chemical methods, but because the main elements in the rare earth polishing powder are lanthanum oxide and cerium oxide, the 2 types of rare earth oxides belong to backlog products and are low in price, and industrial production is not realized all the time for recycling rare earth from the waste rare earth polishing powder.
The flyash-base grouting material is prepared by using a series of industrial solid waste flyash after impurity removal and purification processes. The adhesive is added with a certain amount of adhesive on a construction site, and the adhesive can be used after being uniformly stirred. Has the characteristics of good self-fluidity, good self-sealing property and the like. However, in the use process, the heat-conducting material has some limitations, and has the defects of higher heat-conducting coefficient, lower mechanical property and the like.
At present, the application research of improving the performance of the fly ash-based grouting material by using the invalid rare earth polishing powder is less, and the grouting material with low heat conductivity coefficient, high mechanical strength and high use value prepared by using two industrial solid wastes can fully embody the concepts of waste-free industry and environment-friendly city.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art, and provides a fly ash-based grouting material containing ineffective rare earth polishing powder, and a preparation method and application thereof.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the fly ash-based grouting material comprises fly ash, invalid rare earth polishing powder and a binder, wherein the binder accounts for 20% -42% of the total mass of the fly ash, the invalid rare earth polishing powder and the binder, the invalid rare earth polishing powder accounts for 6% -12% of the total mass of the fly ash and the invalid rare earth polishing powder, and the microscopic morphology of the invalid rare earth polishing powder is spherical particles.
Preferably, the rare earth content REO in the failure rare earth polishing powder is more than or equal to 40%, caO is less than or equal to 10%, and Al 2 O 3 ≤12%、SiO 2 Less than or equal to 35 percent, less than or equal to 3 percent of potassium sodium and less than or equal to 5 percent of impurities.
Preferably, the failure rare earth polishing powder is a failure rare earth polishing powder subjected to pretreatment, and the pretreatment comprises the following steps:
a. sieving and grading the ineffective rare earth polishing powder raw material by a vibrating screen, and removing large particle impurities above a 60-mesh screen;
b. roasting the sieved invalid rare earth polishing powder in a muffle furnace, heating to 200-260 ℃ at room temperature, preserving heat for 1-6h, heating to 850-1000 ℃ after heat preservation is completed, and preserving heat for 3-5h;
c. the failure rare earth polishing powder after roasting is ground by a high-energy air flow mill until the grain diameter is less than or equal to 5% of the screen residue rate of 1200 meshes.
Preferably, the fly ash comprises the following components in percentage by mass: 10-45% of aluminum oxide, 25-55% of silicon oxide, less than or equal to 15% of calcium oxide, less than or equal to 5% of magnesium oxide, less than or equal to 7% of ferric oxide, less than or equal to 5% of potassium sodium and the balance of insoluble matters.
Preferably, the fly ash is pretreated fly ash, and the pretreatment comprises the following steps:
(1) Sieving the fly ash raw material by a 17-28K vibration grading conveyor to obtain floating beads with a diameter of more than 300 mu m;
(2) Roasting the screened fly ash at a high temperature of 750-900 ℃ for 1-5h to remove residual carbon;
(3) Immersing the calcined fly ash into a water bath pool with the temperature of 55-85 ℃, stirring at 10-60rpm for 0.5-3h, settling for 1-2h, and repeating for 1-3 times;
(4) Ball milling the settled fly ash with the solid content of 25% -80%, wherein the ball milling linear speed is 1-13m/s, the slurry passes through an electromagnetic scraping plate channel in the grinding circulation process to remove iron-cobalt-nickel magnetic impurities, the grinding temperature is controlled to be 45-70 ℃, and the slurry is ground to be 3-D90-5 mu m for discharging;
(5) Spray drying the slurry at a feeding speed of 0.1-60L/min at a spraying opening at 210-280 ℃, wherein the appearance of the spray dried fly ash is spherical particles.
Preferably, the particle sizes of the failure rare earth polishing powder and the fly ash are all 7 μm or less and D90. Ltoreq.13 μm or less.
Preferably, the binder is one or more of melamine formaldehyde, furfural phenol, furfural acetone, furfuryl alcohol, polybutadiene, phenol formaldehyde, organohalosilane polymers, silica sol, alumina sol, zirconium sol, and CA70 cement.
The invention also provides a preparation method of the fly ash-based grouting material containing the failure rare earth polishing powder, which specifically comprises the following steps:
s1: uniformly mixing the pretreated fly ash with the pretreated invalid rare earth polishing powder;
s2: and uniformly mixing the mixed powder of the invalid rare earth polishing powder and the fly ash with a binder to obtain a blend.
In a third aspect, the invention also provides application of the fly ash-based grouting material containing the ineffective rare earth polishing powder in preparing an operation layer of an industrial kiln.
Preferably, the operation layer is an operation layer on the surface of the furnace body, the waist or the throat part of the industrial furnace.
In a fourth aspect, the present invention also provides a curing process using the grouting material, where the curing process is: and (3) injecting the grouting material into a mould, then raising the temperature to 180-350 ℃ at a heating rate of 0.1-5 ℃/min, and preserving the heat for 1-10 hours to obtain the cured molding.
Compared with the prior art, the invention has the following advantages:
(1) Compared with the conventional grouting material, the heat conductivity of the fly ash-based grouting material containing the invalid rare earth polishing powder is reduced by more than 20%, and the heat insulation property is strong. The heat conductivity coefficient of the pretreated fly ash is about 0.6 w/m.k, most components of the pretreated ineffective rare earth polishing powder are composite rare earth oxides, the heat conductivity coefficient of the pretreated ineffective rare earth polishing powder is between 0.25 and 0.48 w/m.k, and the heat conductivity coefficient can be effectively reduced by more than 20 percent by adding the ineffective rare earth polishing powder and the fly ash into the grouting material.
(2) The compression strength of the fly ash-based grouting material containing the failure rare earth polishing powder is improved by more than 30% compared with that of the conventional grouting material. After the invalid rare earth polishing powder is used as a polishing material and a polishing task is finished, the powder shape is changed into a biased spherical shape due to a large amount of grinding impact in a fluid medium, and the self-morphology is used in the fly ash grouting material, so that micropores can be fully filled in the grouting material due to the excellent fluidity of the spherical morphology, the bonding strength of a binder and micro powder is increased, and the compressive strength of a grouting material spline is increased.
(3) The fly ash-based grouting material containing the invalid rare earth polishing powder has the advantages that the change rate of a line is reduced by more than 50%, the compactness of grouting material is improved by adding the rare earth oxide into the invalid rare earth polishing powder after pretreatment, the dispersion is uniform, the self heat conductivity coefficient is low, the structural porosity and the apparent porosity of the cured grouting material are reduced, and the line change stability is effectively enhanced.
(4) The fly ash-based grouting material containing the invalid rare earth polishing powder can consume a large amount of industrial solid waste fly ash and the invalid rare earth polishing powder.
Drawings
FIG. 1 is an electron microscope schematic view of the pretreated spent rare earth polishing powder of example 1 of the present invention.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concepts pertain. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The invention will be described in detail with reference to examples.
Example 1
The method comprises the steps of carrying out vibration classification on fly ash by 17K, removing floating beads above 300 microns, carrying out high-temperature roasting on the rest screened fly ash at 800 ℃ for 5 hours to remove residual carbon, carrying out water bath pool at 55 ℃ on the rest fly ash, stirring at 30rpm rate for 30 minutes, standing for 1 hour, replacing upper clean water, repeating the water bath impurity removal step for 3 times, proportioning into 60% -65% solid content after replacing upper clean water for 3 times, feeding the mixture into a ball mill for high-energy grinding at a linear speed of 8m/s, carrying out spray drying treatment when the slurry is ground to D90=5 microns by an electromagnetic aggregate plate channel at a discharge temperature of 55 ℃, carrying out feeding speed of 2L/min, carrying out thermal spraying at a temperature of 270 ℃, and drying spherical micro powder with a D90 particle size of 12 microns. The components of the composite material are 26 percent of aluminum oxide, 45 percent of silicon oxide, 11 percent of calcium oxide, 3 percent of magnesium oxide, 6.05 percent of ferric oxide, 1.25 percent of potassium sodium and the balance of indissolvable matters.
The ineffective rare earth polishing powder is screened by a vibrating screen, large particle impurities above a 60-mesh screen are removed, the ineffective rare earth polishing powder is roasted for 5 hours at the high temperature of 900 ℃ in a muffle furnace and then cooled to room temperature, and the ineffective rare earth polishing powder is ground by a high-energy air flow mill to ensure that the screen residue rate of 1200 meshes is less than or equal to 5 percent, wherein the ineffective rare earth polishing powder comprises the components of cerium oxide 35 percent, lanthanum oxide 14.91 percent, silicon oxide 33.09 percent, aluminum oxide 6.63 percent, calcium oxide 9.13 percent and the balance of impurities.
An electron microscope image of the pretreated failure rare earth polishing powder is shown in figure 1.
Taking undersize and the fly ash after impurity removal according to the mass percentage of 6:94 are evenly mixed in a three-dimensional powder mixer, the mixture is transferred into a cement mortar mixer for low-speed stirring, and a binder (organohalosilane: phenolic aldehyde=1:4 mixed resin) and a mixed powder of invalid rare earth polishing powder and fly ash are added according to the mass percentage of 32:68 are thoroughly mixed and poured into a casting mold. And (3) placing the grouting material mould filled with the failure rare earth polishing powder and the fly ash into an oven to be insulated for 1 hour at 70 ℃, heating at the speed of 0.167 ℃/min, and then insulating for 2 hours after heating to 150 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Example 2
The fly ash and the ineffective rare earth polishing powder are pretreated according to the step of the example 1, and spherical micro powder with the D90 particle size of 10 mu m is obtained after the fly ash is dried. 29% of fly ash, 43% of silicon oxide, 8% of calcium oxide, 2% of magnesium oxide, 3% of ferric oxide, 3% of potassium sodium and the balance of insoluble matters. 89.1% of cerium oxide, 8.8% of silicon oxide, 1.2% of magnesium oxide and the balance of impurities. Taking undersize and the fly ash after impurity removal according to the mass percentage of 7.75:92.25 are evenly mixed in a three-dimensional powder mixer, the mixture is transferred into a cement mortar mixer for low-speed stirring, and a binder (silica sol: phenolic aldehyde=1:4 mixed resin) and a mixed powder of invalid rare earth polishing powder and fly ash are added according to the mass percentage of 30:70, fully mixing and pouring into a casting material mould. And (3) placing the grouting material mould filled with the failure rare earth polishing powder and the fly ash into an oven to be insulated for 1 hour at 70 ℃, heating at a speed of 0.3 ℃/min, and then insulating for 2 hours after heating to 150 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Example 3
The fly ash and the ineffective rare earth polishing powder are pretreated according to the step of the example 1, and the spherical micro powder with the D90 particle size of 12 mu m is obtained after the fly ash is dried. 24% of fly ash, 48% of silicon oxide, 5% of calcium oxide, 3% of magnesium oxide, 5% of ferric oxide, 0.8% of potassium sodium and the balance of insoluble matters. 29.3 percent of rare earth polishing powder for failure comprises 29.1 percent of lanthanum oxide, 61.1 percent of cerium oxide, 7.2 percent of calcium oxide, 2 percent of silicon oxide and the balance of impurities. Taking undersize and the fly ash after impurity removal according to the mass percentage of 10:90 are evenly mixed in a three-dimensional powder mixer, the mixture is transferred into a cement mortar mixer for low-speed stirring, and a binder (aluminum sol: organohalosilane=2:3 mixed resin) and a mixed powder of invalid rare earth polishing powder and fly ash are added according to the mass percentage of 38:62 are thoroughly mixed and poured into a casting mold. And (3) placing the grouting material mould filled with the failure rare earth polishing powder and the fly ash into an oven to be insulated for 1 hour at 70 ℃, heating at a speed of 0.5 ℃/min, and then insulating for 2 hours after heating to 150 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Example 4
The fly ash and the ineffective rare earth polishing powder are pretreated according to the step of the example 1, and the spherical micro powder with the D90 particle size of 12 mu m is obtained after the fly ash is dried. 24% of fly ash, 48% of silicon oxide, 5% of calcium oxide, 3% of magnesium oxide, 5% of ferric oxide, 0.8% of potassium sodium and the balance of insoluble matters. 29.3 percent of rare earth polishing powder for failure comprises 29.1 percent of lanthanum oxide, 61.1 percent of cerium oxide, 7.2 percent of calcium oxide, 2 percent of silicon oxide and the balance of impurities. Taking undersize and the fly ash after impurity removal according to the mass percentage of 12:88 are evenly mixed in a three-dimensional powder mixer, the mixture is transferred into a cement mortar mixer for low-speed stirring, and a binder (aluminum sol: organohalosilane=2:3 mixed resin) and a mixed powder of invalid rare earth polishing powder and fly ash are added according to the mass percentage of 20:80, fully mixing and pouring into a casting material mould. And (3) placing the grouting material mould filled with the failure rare earth polishing powder and the fly ash into an oven to be kept at 70 ℃ for 1 hour, heating at a speed of 2 ℃/min, and keeping the temperature for 10 hours after the temperature is raised to 120 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Example 5
The fly ash and the ineffective rare earth polishing powder are pretreated according to the step of the example 1, and the spherical micro powder with the D90 particle size of 12 mu m is obtained after the fly ash is dried. 24% of fly ash, 48% of silicon oxide, 5% of calcium oxide, 3% of magnesium oxide, 5% of ferric oxide, 0.8% of potassium sodium and the balance of insoluble matters. The rare earth polishing powder comprises 29.3 percent of lanthanum oxide, 55.1 percent of cerium oxide, 6.3 percent of praseodymium oxide, 7.2 percent of calcium oxide, 2 percent of silicon oxide and the balance of impurities. Taking undersize and the fly ash after impurity removal according to the mass percentage of 7:93 in a three-dimensional powder mixer, transferring into a cement mortar mixer for low-speed stirring, adding a binder (aluminum sol: organohalosilane=2:3 mixed resin) and a mixed powder of invalid rare earth polishing powder and fly ash according to the mass percentage of 42:58 are thoroughly mixed and poured into a casting mold. And (3) placing the grouting material mould filled with the failure rare earth polishing powder and the fly ash into an oven to be kept at 70 ℃ for 1 hour, heating at a speed of 3 ℃/min, and keeping the temperature for 5 hours after the temperature is raised to 160 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Example 6
The fly ash and the ineffective rare earth polishing powder are pretreated according to the step of the example 1, and the spherical micro powder with the D90 particle size of 12 mu m is obtained after the fly ash is dried. 24% of fly ash, 48% of silicon oxide, 5% of calcium oxide, 3% of magnesium oxide, 5% of ferric oxide, 0.8% of potassium sodium and the balance of insoluble matters. The rare earth polishing powder comprises 29.3 percent of lanthanum oxide, 55.1 percent of cerium oxide, 6.3 percent of praseodymium oxide, 7.2 percent of calcium oxide, 2 percent of silicon oxide and the balance of impurities. Taking undersize and the fly ash after impurity removal according to the mass percentage of 7:93 in a three-dimensional powder mixer, transferring into a cement mortar mixer for low-speed stirring, adding a binder (aluminum sol: organohalosilane=2:3 mixed resin) and a mixed powder of invalid rare earth polishing powder and fly ash according to the mass percentage of 42:58 are thoroughly mixed and poured into a casting mold. And (3) placing the grouting material mould filled with the failure rare earth polishing powder and the fly ash into an oven to be insulated for 1 hour at 70 ℃, heating at a speed of 5 ℃/min, and insulating for 2 hours after heating to 180 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Comparative example 1
The method comprises the steps of carrying out vibration classification on fly ash by 17K, removing floating beads above 300 microns, carrying out high-temperature roasting on the rest screened fly ash at 800 ℃ for 5 hours to remove residual carbon, carrying out water bath pool at 55 ℃ on the rest fly ash, stirring at 30rpm rate for 30 minutes, standing for 1 hour, replacing upper clean water, repeating the water bath impurity removal step for 3 times, proportioning into 60% -65% solid content after replacing upper clean water for 3 times, feeding the mixture into a ball mill for high-energy grinding at a linear speed of 8m/s, carrying out spray drying treatment when the slurry is ground to D90=5 microns by an electromagnetic aggregate plate channel at a discharge temperature of 55 ℃, carrying out feeding speed of 2L/min, carrying out thermal spraying at a temperature of 270 ℃, and drying spherical micro powder with a D90 particle size of 12 microns. The components of the composite material are 26 percent of aluminum oxide, 45 percent of silicon oxide, 11 percent of calcium oxide, 3 percent of magnesium oxide, 6.05 percent of ferric oxide, 1.25 percent of potassium sodium and the balance of indissolvable matters.
The fly ash after impurity removal is uniformly mixed in a three-dimensional powder mixer, the mixture is transferred into a cement mortar mixer for low-speed stirring, and a binder (organohalosilane: phenolic aldehyde=1:4 mixed resin) and fly ash powder are added according to the mass percentage of 32:68 are thoroughly mixed and poured into a casting mold. And (3) placing the mold filled with the fly ash grouting material into an oven at 70 ℃ for heat preservation for 1 hour, heating at a speed of 0.167 ℃/min, and heat preservation for 2 hours after heating to 150 ℃. And after the temperature in the oven is reduced to room temperature, demolding the coal ash grouting material sample strips, and testing the removed sample strips, wherein the results are shown in Table 1.
Comparative example 2
The comparative example is the same as the treatment process of example 1, except that the decontaminated spent rare earth polishing powder and the fly ash which is not pretreated are mixed according to the mass percentage of 6: 94. The prepared grouting material sample strip is demoulded, and the removed sample strip is tested, and the result is shown in table 1.
Comparative example 3
The comparative example is the same as the treatment process of example 1, except that the decontaminated spent rare earth polishing powder and the fly ash which is not pretreated are mixed according to the mass percentage of 5:95 are uniformly mixed in a three-dimensional powder mixer. The prepared grouting material sample strip is demoulded, and the removed sample strip is tested, and the result is shown in table 1.
Comparative example 4
The comparative example is the same as the treatment process of example 1, except that the decontaminated spent rare earth polishing powder and the fly ash which is not pretreated are mixed according to the mass percent of 13:87 are mixed uniformly in a three-dimensional powder mixer. The prepared grouting material sample strip is demoulded, and the removed sample strip is tested, and the result is shown in table 1.
Comparative example 5
The comparative example was the same as example 1 except that the grout mold containing the spent rare earth polishing powder and fly ash was placed in an oven at 70 c for 1 hour, and then heated at a rate of 5.1 c/min, and then heat-preserved for 2 hours after being heated to 150 c. The sample bar cannot be taken out, the temperature rises too fast to cause the boiling of the solidified resin, and the sample bar cannot be molded. No experimental data were present.
Comparative example 6
500g of commercial grouting material is taken, and the components of the grouting material comprise 26% of high-alumina powder, 33% of flint clay, 5% of calcined kaolin, 1% of borax, 12% of silicon carbide and 1% of lithium oxide. The powder was thoroughly mixed with (organohalosilane: phenolic=1:4) resin 22% and poured into the casting mold. After the temperature is kept at 70 ℃ for one hour, the temperature is raised at the speed of 0.167 ℃/min, and the temperature is kept for 2 hours after the temperature is raised to 150 ℃. And after the temperature in the oven is reduced to room temperature, demolding the grouting material sample strip, and testing the removed sample strip, wherein the result is shown in table 1.
Table 1: grouting material performance data sheet
As can be seen from the data of examples 1-5 and comparative example 6 in the above table, the heat conductivity of the grouting material of the invention is reduced by more than 20% compared with that of the conventional grouting material, the compressive strength is improved by more than 30%, and the linear change rate is reduced by more than 50%.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A fly ash-based grouting material containing failure rare earth polishing powder is characterized in that: the polishing agent comprises fly ash, invalid rare earth polishing powder and a binder, wherein the binder accounts for 20% -42% of the total mass of the fly ash, the invalid rare earth polishing powder and the binder, the invalid rare earth polishing powder accounts for 6% -12% of the total mass of the fly ash and the invalid rare earth polishing powder, and the microscopic morphology of the invalid rare earth polishing powder is spherical particles;
the REO in the failure rare earth polishing powder is more than or equal to 40%, caO is less than or equal to 10%, al 2 O 3 ≤12%、SiO 2 Less than or equal to 35 percent, less than or equal to 3 percent of potassium sodium and less than or equal to 5 percent of impurities;
the failure rare earth polishing powder is failure rare earth polishing powder subjected to pretreatment, and the pretreatment comprises the following steps:
a. sieving and grading the ineffective rare earth polishing powder raw material by a vibrating screen, and removing large particle impurities above a 60-mesh screen;
b. roasting the sieved invalid rare earth polishing powder in a muffle furnace, heating to 200-260 ℃ at room temperature, preserving heat for 1-6h, heating to 850-1000 ℃ after heat preservation is completed, and preserving heat for 3-5h;
c. grinding the failure rare earth polishing powder after roasting by a high-energy air flow mill until the grain diameter is less than or equal to 5% of the screen residue rate of 1200 meshes;
the fly ash comprises the following components in percentage by mass: 10-45% of aluminum oxide, 25-55% of silicon oxide, less than or equal to 15% of calcium oxide, less than or equal to 5% of magnesium oxide, less than or equal to 7% of ferric oxide, less than or equal to 5% of potassium sodium and the balance of insoluble matters;
the fly ash is pretreated fly ash, and the pretreatment comprises the following steps:
(1) Sieving the fly ash raw material by a 17-28K vibration grading conveyor to obtain floating beads with a diameter of more than 300 mu m;
(2) Roasting the screened fly ash at a high temperature of 750-900 ℃ for 1-5h to remove residual carbon;
(3) Immersing the calcined fly ash into a water bath pool with the temperature of 55-85 ℃, stirring at 10-60rpm for 0.5-3h, settling for 1-2h, and repeating for 1-3 times;
(4) Ball milling the settled fly ash with the solid content of 25% -80%, wherein the ball milling linear speed is 1-13m/s, the slurry passes through an electromagnetic scraping plate channel in the grinding circulation process to remove iron-cobalt-nickel magnetic impurities, the grinding temperature is controlled to be 45-70 ℃, and the slurry is ground to be 3-D90-5 mu m for discharging;
(5) Spray drying the slurry at a feeding speed of 0.1-60L/min at a spraying opening at 210-280 ℃, wherein the appearance of the spray dried fly ash is spherical particles;
the binder is one or more of melamine formaldehyde, furfural phenol, furfural acetone, furfuryl alcohol, polybutadiene, phenol formaldehyde, organohalosilane polymer, silica sol, alumina sol, zirconium sol and CA70 cement.
2. The fly ash-based grouting material containing the ineffective rare earth polishing powder according to claim 1, wherein: the particle sizes of the failure rare earth polishing powder and the fly ash are all 7 mu m and less than or equal to D90 and 13 mu m.
3. The method for preparing the fly ash-based grouting material containing the ineffective rare earth polishing powder as claimed in claim 1 or 2, which is characterized in that: the method specifically comprises the following steps:
s1: uniformly mixing the pretreated fly ash with the pretreated invalid rare earth polishing powder;
s2: and uniformly mixing the mixed powder of the invalid rare earth polishing powder and the fly ash with a binder to obtain a blend.
4. Use of the fly ash-based grouting material containing the ineffective rare earth polishing powder according to claim 1 or 2 for preparing an operation layer of an industrial kiln, wherein the operation layer is an operation layer of the surface of a kiln body, a waist or a throat part of the industrial kiln.
5. A curing process of grouting material is characterized in that: the curing process comprises the following steps: the grouting material according to claim 1 or 2 is injected into a mould, and then is heated to 180-350 ℃ at a heating rate of 0.1-5 ℃/min, and is preserved for 1-10 hours, so that the grouting material can be cured and molded.
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