CN111960851A - 基于铝灰原料制备堇青石陶瓷过滤板的方法 - Google Patents
基于铝灰原料制备堇青石陶瓷过滤板的方法 Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 55
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000000919 ceramic Substances 0.000 title claims abstract description 35
- 229910052878 cordierite Inorganic materials 0.000 title claims abstract description 29
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002994 raw material Substances 0.000 title claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 15
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 14
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000006004 Quartz sand Substances 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 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
- 238000004513 sizing Methods 0.000 claims description 6
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 239000001099 ammonium carbonate Substances 0.000 claims description 5
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 238000001238 wet grinding Methods 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 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 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
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- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 claims description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 238000004939 coking Methods 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 239000012459 cleaning agent Substances 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 7
- 239000000454 talc Substances 0.000 abstract description 4
- 229910052623 talc Inorganic materials 0.000 abstract description 4
- 238000004537 pulping Methods 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 238000000498 ball milling Methods 0.000 description 3
- 125000001309 chloro group Chemical class Cl* 0.000 description 3
- 150000002221 fluorine Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
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- 239000002893 slag Substances 0.000 description 3
- 235000012222 talc Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 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
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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Abstract
本发明提供一种基于铝灰原料制备堇青石陶瓷过滤板的方法，该方法主要是以铝灰30～60%、滑石20～55%、石英砂20‑50%为主料，以粘结剂（占主料重量的1‑5%）和除杂剂（为铝灰重量的0.5‑5%）为辅料，并将所述粉料和水按照重量比1～4:1湿磨制浆；再以聚氨酯泡沫板浸入上述料浆制坯、晾晒、烘干；最后再进行高温富氧烧结，所得堇青石陶瓷过滤板气孔率≥85%，堇青石相≥95%，抗热振性≥5次；既实现了铝灰的资源化利用，又节约了自然资源，降低了陶瓷过滤板材的生产成本。
Description
技术领域
本发明涉及过滤材料制备技术领域，具体涉及一种基于铝灰原料制备堇青石陶瓷过滤板的方法。
背景技术
铝灰是铝工业生产过程中产生的废弃物，主要成分为单质铝、铝的化合物、氧化硅、氧化镁、钠盐、钾盐、氟化盐、氧化钛等，具有毒性及易燃性。电解铝工艺熔体转移、净化、除杂过程熔体表面产生的浮渣，废铝熔炼熔体转移、净化、除杂过程熔体表面产生的浮渣（盐渣和铝灰），熔盐法从铝灰、铝渣中回收金属铝的过程中产生的盐渣和二次铝灰均被列入2019版《国家危险废物名录》。据统计，每生产1吨铝，大概产生15～30kg的铝灰，2019年国内铝产量为3500万吨，产生铝灰约52.5～105万吨，其无害化和资源化是铝工业生产中迫切需要解决的问题。
另一方面，陶瓷具有耐高温、耐腐蚀、抗热振性好的特性，陶瓷过滤板内部多是相互贯通的微孔结构，比表面积大、吸附能力强，广泛应用在金属和非金属精矿的过滤脱水、金属熔体的过滤除杂、环保行业的固液分离等领域，目前陶瓷过滤板中氧化铝质、碳化硅质居多，而此类材质热振性能差，生产成本较高，需耗费大量的自然资源；而当前陶瓷类过滤板材需求量很大，现有来源难以满足各类生产中的需求。
发明内容
本发明要解决的技术问题是提供一种基于铝灰原料制备堇青石陶瓷过滤板的方法，以期在实现铝灰无害化、资源化利用的同时解决现有技术中陶瓷过滤板耗费大量自然资源、生产高且产量难以满足需要的技术问题。
为解决上述技术问题，本发明采用如下技术方案：
设计一种基于铝灰原料制备堇青石陶瓷过滤板的方法，包括以下步骤：
（1）以重量百分比计，取铝灰30～60%、滑石粉20～55%、石英砂20～50%混配成主料；
（2）再按主料重量的1～5%向其中添加粘结剂，按铝灰重量的0.5-5%向其中添加除杂剂，制得粉料；
（3）以1～4:1的重量比将所得粉料和水混合湿磨，制得浆料；
（4）取聚氨酯泡沫板充分浸润所述浆料后捞出，沥出或挤压出多余浆料，得上浆板；
（5）将上浆板晾晒并烘干后得板坯；
（6）低温焦化（300-550℃）泡沫板、高温富氧环境下烧结即得堇青石陶瓷过滤板。
所述粘结剂为聚乙烯醇、纸浆粉、羟丙基甲基纤维素、羟丙基甲基纤维素钠中的至少一种。
所述除杂剂为氟化铵、氯化铵、氟化铝、碳酸铵中的至少一种；此类除杂剂可快速彻底去除铝灰中钠盐、钾盐等杂质，同时促使铝灰中的氮化铝快速氧化脱氮，生成无毒无害的氮气，确保环保无污染。
所述聚氨酯泡沫板密度为10-60PPI。
在所述步骤（6）中，烧结温度为1300-1420℃、保温时间为2-5h，
烧结期间的升温步骤为：0-300℃阶段升温速率30℃/h，300℃-550℃阶段升温速率20℃/h，550℃-1000℃阶段升温速率15℃/h、氧含量控制为氧含量5-12%（以确保使铝灰中的金属铝和氮化铝充分氧化），1000℃-烧结终温阶段升温速率20℃/h，保温后随炉冷却。
在所述步骤（3）中，粉料湿磨粒度控制为325-400目。
在所述步骤（5）中，上浆板自然晾晒24h，于150℃烘干12h。
所述铝灰含Al≤5%、AlN≤10%、Al2O3≥80%、SiO2≤0.5%、CaO≤0.5%、MgO≤0.5、Fe2O3≤ 0.5%，粒度≥100目。
与现有技术相比，本发明的主要有益技术效果在于：
1. 本发明方法制备出的陶瓷过滤板与氧化铝、碳化硅材质陶瓷过滤板相比：本发明制备出的堇青石陶瓷过滤板具有较低的热膨胀系数，高温抗热震性能优异，可在冷热温差大的环境下长期使用。
2. 本发明实现了铝灰的无害化和资源化，节约自然资源、降低生产成本（金属铝燃烧、释放大量的热量，制备过程中燃料消耗少；铝灰原料价格远低于矾土或氧化铝的价格）。
3. 本发明所制得的堇青石陶瓷过滤板充分利用了铝灰中的铝、镁质成分，制成品气孔率≥85%，堇青石相（硅酸盐矿物）≥95%，抗热振性≥5次；其成品耐火性好、受热膨胀率低。
4. 本发明制备过程中会有少量的HF气体排出，在环保允许范围内，且能进行有效的回收利用，其成品里面则不含有氟化物。
具体实施方式
下面结合实施例来说明本发明的具体实施方式，但以下实施例只是用来详细说明本发明，并不以任何方式限制本发明的范围。
在以下实施例中所涉及的原料如无特别说明，均为市售常规原料；所涉及的试验或检测方法，如无特别说明，均为常规方法。
实施例1：制备堇青石陶瓷过滤板的方法
取37份铝灰（含Al 5%、AlN 10%、Al2O3 70%、SiO2 3%、MgO 1%，TiO2 2.2%，其余为氯盐及氟盐杂质）、45份滑石（纯度98.5%）、23份石英砂（纯度99%）混合均匀，外加3份聚乙烯醇粘结剂、1份氟化氨和0.5份碳酸铵混合物，将上述粉料和水按照4:1的重量比混合，用陶瓷球磨罐湿磨至325目，制成料浆。
取密度为30PPI的聚氨酯泡沫板浸入上述料浆；待浆体均匀浸透后，取出聚氨酯泡沫板，挤出多余的料浆；将粘有料浆的聚氨酯泡沫板坯体自然晾晒24h，在150℃烘干12h。
然后在1380℃进行烧结，具体升温曲线为：0-300℃、30℃/h，300-550℃、20℃/h，550-1000℃、5℃/h、氧含量为8%，1000-1380℃、20℃/h， 1380℃保温4h后随炉冷却，即得堇青石陶瓷过滤板。
所制备出的该批次堇青石陶瓷过滤板经检测，含MgO 13.5%、Al2O3 34.3%、SiO250.2%，堇青石相占96.2%，气孔率85%，孔隙均匀度为28，抗热振性6次。
实施例2：制备堇青石陶瓷过滤板的方法
取42份铝灰（含Al 2%、AlN 5%、Al2O3 70%、SiO2 5%、MgO 10%，TiO2 2.2%，其余为氯盐及氟盐杂质）、25份滑石（纯度98.5%）、33份石英砂（纯度99%）混合均匀，外加3份聚乙烯醇粘结剂、1份氟化氨和0.5份碳酸铵混合物，将上述粉料和水按照1:1的重量比混合，用陶瓷球磨罐湿磨至400目，制成料浆。
取20PPI的聚氨酯泡沫板浸入上述料浆；待浆体均匀浸透后，取出聚氨酯泡沫板，挤出多余的料浆；将粘有料浆的聚氨酯泡沫板坯体自然晾晒24h，在150℃烘干12h。
然后在1350℃进行烧结，具体升温制度为：0-300℃、30℃/h，300-550℃、20℃/h，550-1000℃、5℃/h、氧含量为5%，1000-1350℃、20℃/h， 1350℃保温2h后随炉冷却，即得堇青石陶瓷过滤板。
所制得的该批次堇青石陶瓷过滤板经检测，含MgO 13.5%、Al2O3 34.6%、SiO2 50%，堇青石相占95.6%，气孔率87.5%，孔隙均匀度为19，抗热振性7次。
实施例3：制备堇青石陶瓷过滤板的方法
取36份铝灰（含Al 5%、AlN 8%、Al2O3 75%、SiO2 1%、MgO 1%，TiO2 2.5%，其余为氯盐及氟盐杂质）、40份滑石（纯度98.5%）、24份石英砂（纯度99%）混合均匀，外加3份聚乙烯醇粘结剂、1份氟化氨和0.5份碳酸铵混合物，将上述粉料和水按照3:2的重量比混合，用陶瓷球磨罐湿磨至350目，制成料浆。
取密度为10PPI的聚氨酯泡沫板浸入上述料浆；待浆体均匀浸透后，取出聚氨酯泡沫板，沥出多余的料浆。
将粘有料浆的聚氨酯泡沫板坯体自然晾晒24h，在150℃烘干12h。
然后在1300℃进行烧结，具体升温步骤为：0-300℃、30℃/h，300-550℃、20℃/h，550-1000℃、5℃/h、氧含量为5%，1000-1300℃、20℃/h， 1300℃保温6h后随炉冷却，即得堇青石陶瓷过滤板。
所制得该批次的堇青石陶瓷过滤板，经检测含MgO 13.2%、Al2O3 34%、SiO2 50%，堇青石相占96.8%，气孔率87.5%，孔隙均匀度为19，抗热振性5次。
上面结合实施例对本发明作了详细的说明；但是，所属技术领域的技术人员能够理解，在不脱离本发明构思的前提下，还可以对上述实施例中的各个具体参数进行变更，或者是对相关材料及步骤进行等同的替代，从而形成多个具体的实施例，均为本发明的常见变化范围，在此不再逐一详述。
Claims (9)
1.一种基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，包括以下步骤：
（1）以重量百分比计，取铝灰30～60%、滑石粉20～55%、石英砂20～50%混配成主料；
（2）再按主料重量的1～5%向其中添加粘结剂，按铝灰重量的0.5～5%向其中添加除杂剂，混配成粉料；
（3）以1～4:1的重量比将所得粉料和水混合湿磨，制得浆料；
（4）取聚氨酯泡沫板充分浸润所述浆料后捞出，沥出或挤压出多余浆料，得上浆板；
（5）将上浆板晾晒并烘干后得板坯；
（6）低温焦化泡沫板、高温富氧环境下烧结即得堇青石陶瓷过滤板。
2.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，所述粘结剂为聚乙烯醇、羟丙基甲基纤维素、羟丙基甲基纤维素钠、纸浆粉中的至少一种。
3.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，所述除杂剂为氟化铵、氯化铵、氟化铝、碳酸铵中的至少一种。
4.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，所述聚氨酯泡沫板密度为10～60PPI。
5.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，在所述步骤（6）中，烧结温度为1300-1420℃、保温时间为2-5h。
6.根据权利要求5所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，烧结期间的升温步骤为：0-300℃阶段升温速率30℃/h，300℃-550℃阶段升温速率20℃/h，550℃-1000℃阶段升温速率15℃/h、氧含量控制为氧含量5-12%，1000℃至烧结终温阶段升温速率20℃/h，保温后随炉冷却。
7.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，在所述步骤（3）中，粉料湿磨粒度控制为325-400目。
8.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，在所述步骤（5）中，上浆板自然晾晒24h，于150℃烘干12h。
9.根据权利要求1所述基于铝灰原料制备堇青石陶瓷过滤板的方法，其特征在于，所述铝灰含Al≤5%、AlN≤10%、Al2O3≥80%、SiO2≤0.5%、CaO≤0.5%、MgO≤0.5、Fe2O3≤ 0.5%，粒度≥100目。
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