CN108503335A - 一种具有高比表面积的轻质多孔净污载体及其制备方法 - Google Patents
一种具有高比表面积的轻质多孔净污载体及其制备方法 Download PDFInfo
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- polystyrene
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 54
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002956 ash Substances 0.000 claims abstract description 23
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 18
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 18
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003365 glass fiber Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 4
- 235000019795 sodium metasilicate Nutrition 0.000 claims abstract description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 52
- 239000004793 Polystyrene Substances 0.000 claims description 37
- 229920002223 polystyrene Polymers 0.000 claims description 37
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- 239000000843 powder Substances 0.000 claims description 25
- 235000019353 potassium silicate Nutrition 0.000 claims description 24
- 239000011812 mixed powder Substances 0.000 claims description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 238000009835 boiling Methods 0.000 claims description 16
- 235000021355 Stearic acid Nutrition 0.000 claims description 14
- 229920006248 expandable polystyrene Polymers 0.000 claims description 14
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 14
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 14
- 239000008117 stearic acid Substances 0.000 claims description 14
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
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- 238000010792 warming Methods 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
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- RSWGJHLUYNHPMX-UHFFFAOYSA-N 1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylic acid Chemical compound C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 241000790917 Dioxys <bee> Species 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000004925 denaturation Methods 0.000 claims 1
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- 244000005700 microbiome Species 0.000 abstract description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
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- 241000251468 Actinopterygii Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000015895 biscuits Nutrition 0.000 description 2
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- 238000002309 gasification Methods 0.000 description 2
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- 201000004384 Alopecia Diseases 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种具有高比表面积的轻质多孔净污载体和一种具有高比表面积的轻质多孔净污载体的制备方法,包括壳壁,所述壳壁为若干个曲面薄壁相互连接而成的骨架状结构,所述壳壁内部有多个相互连通的孔洞,所述壳壁材质包括灰渣、高岭土、氧化铁、氧化铝、硅酸钠和玻璃纤维。所制备的轻质多孔净污载体具有比表面积大、透水率高,结构强度高、吸附性能强和生产成本低等优点,可作为微生物或催化材料的载体对水体污染物进行高效去除。
Description
技术领域
本发明涉及一种具有高比表面积的轻质多孔净污载体及其制备方法,属于复合材料成形技术领域。
背景技术
随着经济的发展和人口的增多,大量未经有效处理的污水排放使我国水污染问题越来越严重。目前我国城市水环境污染主要体现在河道、湖泊水体黑臭或富营养,而治理技术大多采用截污、驳岸、清淤等工程手段,由于城市河湖面源污染和内源污染的存在,工程手段不可能彻底解决城市水环境黑臭或富营养问题,特别是富营养问题严重地威胁着社会的可持续发展和人类的生存。大量工业废水、农业污水和生活污水在未经处理或处理不彻底时便排入河流、湖泊和海洋等,且污水中具有污染种类多、成分复杂、可生化性差等特点,尤其我国作为发展中国家,不及时处理大量排出的污水将时刻威胁着生态环境,阻碍着经济的可持续性发展。
生物修复和生态恢复是近几年兴起的城市水环境治理方法,实践证明,生物修复和生态恢复是城市河道、湖泊治理的有效方法和必要手段。城市水环境生物修复和生态恢复主要采用植物修复、生物操纵技术、人工湿地、氧化塘技术、人工砾石接触氧化等技术和手段,其根本在于恢复河道湖泊洁净好氧生态系统,提高其自净能力。而我国目前大部分城市河(湖)护岸主要考虑其蓄洪、排洪泄洪功能,采用钢筋混凝土结构或混凝土砌块衬砌,护坡坚固,阻隔了水土的生态联系,造成河岸光秃,水生植物无法生长;河岸带无多孔结构,微型动物、鱼类、昆虫等无法栖息繁衍;以上原因造成城市河(湖)生物多样性差、自净能力降低、生态系统脆弱、一旦少量污水排入,即可能造成河湖水体富营养甚至黑臭。虽然有人对混凝土护岸进行了部分改进,但混凝土介质无大的孔道,不利于鸟类和鱼类栖息繁衍;仍然不能满足河湖生态恢复的需要。
生态多孔载体技术是近年来在国际上研究和发展的热点技术,通过将多孔载体固定在现有的混凝土护坡上使之成为生态护岸或作为浮床基体提高净化效率。多孔介质具有较高的比表面积和透水率,有利于促进微生物附着和微型动物生长繁殖,从而提升对受污染水体的净化能力。
目前对净污型多孔材料的研究热点主要集中在系列天然多孔材料上,如硅胶、沸石、陶粒等。但上述基体材料在工程应用中普遍具有成本高、结构强度低、成形性差的缺点,不适合在水利环保工程中大规模的使用。因此研发一种具有较大孔隙率的人造净污载体,不但具有较高的透水性能,而且具有较大的比表面积,进一步提高其生物附着性及水力停留时间,这将对我国环境治理水平与资源循环利用具有积极的意义。
发明内容
本发明所要解决的技术问题是克服现有技术的缺陷,提供一种具有高比表面积的轻质多孔净污载体和一种具有高比表面积的轻质多孔净污载体的制备方法,所制备的轻质多孔净污载体具有比表面积大、透水率高,结构强度高、吸附性能强和生产成本低等优点,可作为微生物或催化材料的载体对水体污染物进行高效去除。
为达到上述目的,本发明提供一种具有高比表面积的轻质多孔净污载体,包括壳壁,所述壳壁为若干个曲面薄壁相互连接而成的骨架状结构,所述壳壁内部有多个相互连通的孔洞,所述壳壁材质包括灰渣、高岭土、氧化铁、氧化铝、硅酸钠和玻璃纤维。
优先地,所述壳壁壁厚2~5mm。
一种具有高比表面积的轻质多孔净污载体的制备方法,包括以下步骤:
1)先将灰渣球研磨分散,再将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维放入烘箱中烘干,然后将将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维进行均匀混合获得混合粉料,将混合粉料倒入粉料沸腾槽中;
2)将可发性聚苯乙烯颗粒放置于密闭容器中,通入水蒸气加热,将聚苯乙烯颗粒预发泡并在空气中冷却至室温;
3)向预发泡的聚苯乙烯颗粒表面喷洒水玻璃溶液,喷洒过程中不断翻动聚苯乙烯颗粒直至所有颗粒表面均包覆了一层水玻璃溶液,然后静置一段时间以提高包覆层的粘度及流变性;
4)将包覆了水玻璃溶液的聚苯乙烯颗粒倒入粉料沸腾槽的筛网上,进气管中通入二氧化碳气体一段时间,使聚苯乙烯颗粒表面均匀包裹一层混合粉料;
5)重复上述步骤3)和步骤4)若干次,即获得表面包覆了壳壁的颗粒坯料;
6)将颗粒坯料放置于密闭不锈钢成形模具中,模具上开设有排气孔,加入颗粒坯料;将模具放置于电炉中从室温开始随炉升温,然后再随炉冷却至室温,开模即可获得成形的轻质多孔净污载体。
优先地,步骤1)中,先将灰渣球研磨分散至20~30目,再将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和长度为4~6mm的短切玻璃纤维放入烘箱中60℃的烘干2~3h,然后将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维按重量比70:25:2:2:0.5:0.5进行均匀混合获得混合粉料,将混合粉料倒入粉料沸腾槽中。
优先地,步骤2)中,将直径为0.4~0.5mm的可发性聚苯乙烯颗粒放置于密闭容器中,通入100~130℃的水蒸气加热2~6min,将聚苯乙烯颗粒预发泡至6~12mm并在空气中冷却至室温。
优先地,步骤3)中,向预发泡的聚苯乙烯颗粒表面喷洒模数为2.5~3.0的水玻璃溶液,喷洒过程中不断翻动聚苯乙烯颗粒直至所有颗粒表面均包覆了一层水玻璃溶液,然后静置10~15min,以提高包覆层的粘度及流变性。
优先地,步骤4)中,将包覆了水玻璃溶液的聚苯乙烯颗粒倒入粉料沸腾槽的筛网上,底部进气管7中通入70℃~80℃的二氧化碳气体3~5min,使聚苯乙烯颗粒表面均匀包裹一层混合粉料。
优先地,步骤5)中,重复上述步骤3)和步骤4)2~3次,即获得表面包覆了壳壁的颗粒坯料。
优先地,步骤6)中,将颗粒坯料放置于密闭的不锈钢成形模具中,模具上开设有排气孔,向模具中加入颗粒坯料,加入的颗粒坯料体积为不锈钢成形模具内腔容积的1/2~2/3;将模具放置于电炉中从室温开始随炉升温,首先以3~5℃/min的速度升温至600℃并恒温30min,然后以20~25℃/min的速度升温至1285℃并恒温30min,然后随炉冷却至室温,开模即可获得成形的轻质多孔净污载体。
本发明所达到的有益效果:
1)本发明所制备的轻质多孔净污载体具有比表面积大、透水率高,结构强度高、吸附性能强和生产成本低等优点,可作为微生物或催化材料的载体对水体污染物进行高效去除;所制备的净污载体为曲面薄壳搭接结构,比表面积远高于普通骨架状泡沫陶瓷材料,可以为微生物提供大量的附着表面,从而提高净污载体的水质净化效率;
2)本发明具有较高的孔隙率和开孔率,外界的污水可以进入到载体内部,被净化后又从载体内流出,同时由于本发明内部结构的复杂性,水力停留时间远高于普通多孔材料,这有利于延长反应时间,提高净污效率;
3)壳壁采用多种矿物粉料经高温烧结而成,烧结固化后的结构具有较高的强度和硬度,且耐腐蚀性强,适合在污水中长期工作。
3)采用粉料沸腾法进行表面制壳,包裹均匀性好,且采用了二氧化碳气体促进水玻璃覆膜固化方法,不但使得粉料粘附稳定,不易脱落,而且提高了生产效率。
4)通过控制预发泡时间可以获得不同粒径的预发泡聚苯乙烯颗粒,从而制备出具有不同孔隙率和比表面积的净污载体,操作方便可靠。
5)制备方法简单,成本低,适宜进行大批量生产。
附图说明
附图1是本发明的微观结构图;
附图2是粉料沸腾槽的结构图;
附图3是本发明的实施例一示意图;
附图4是本发明的实施例二示意图。
图中的1是壳壁、2是孔洞、3是粉料沸腾槽、4是颗粒坯料、5是筛网、6是混合粉料、7是进气管。
具体实施方式
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案,而不能以此来限制本发明的保护范围。
一种具有高比表面积的轻质多孔净污载体,包括壳壁,所述壳壁为若干个曲面薄壁相互连接而成的骨架状结构,所述壳壁内部有多个相互连通的孔洞,所述壳壁材质包括灰渣、高岭土、氧化铁、氧化铝、硅酸钠和玻璃纤维。
进一步地,所述壳壁壁厚2~5mm。
一种具有高比表面积的轻质多孔净污载体的制备方法,包括以下步骤:
1)先将灰渣球研磨分散,再将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维放入烘箱中烘干,然后将将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维进行均匀混合获得混合粉料,将混合粉料倒入粉料沸腾槽中;
2)将可发性聚苯乙烯颗粒放置于密闭容器中,通入水蒸气加热,将聚苯乙烯颗粒预发泡并在空气中冷却至室温;
3)向预发泡的聚苯乙烯颗粒表面喷洒水玻璃溶液,喷洒过程中不断翻动聚苯乙烯颗粒直至所有颗粒表面均包覆了一层水玻璃溶液,然后静置一段时间以提高包覆层的粘度及流变性;
4)将包覆了水玻璃溶液的聚苯乙烯颗粒倒入粉料沸腾槽的筛网上,进气管中通入二氧化碳气体一段时间,使聚苯乙烯颗粒表面均匀包裹一层混合粉料;
5)重复上述步骤3)和步骤4)若干次,即获得表面包覆了壳壁的颗粒坯料;
6)将颗粒坯料放置于密闭不锈钢成形模具中,模具上开设有排气孔,加入颗粒坯料;将模具放置于电炉中从室温开始随炉升温,然后再随炉冷却至室温,开模即可获得成形的轻质多孔净污载体。
进一步地,步骤1)中,先将灰渣球研磨分散至20~30目,再将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和长度为4~6mm的短切玻璃纤维放入烘箱中60℃的烘干2~3h,然后将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维按重量比70:25:2:2:0.5:0.5进行均匀混合获得混合粉料,将混合粉料倒入粉料沸腾槽中。
进一步地,步骤2)中,将直径为0.4~0.5mm的可发性聚苯乙烯颗粒放置于密闭容器中,通入100~130℃的水蒸气加热2~6min,将聚苯乙烯颗粒预发泡至6~12mm并在空气中冷却至室温。
本实施例中,可发性聚苯乙烯颗粒直径取值0.4或0.5mm,水蒸气为100℃或130℃,水蒸气加热2或6min,将聚苯乙烯颗粒预发泡至6或12mm。
进一步地,步骤3)中,向预发泡的聚苯乙烯颗粒表面喷洒模数为2.5~3.0的水玻璃溶液,喷洒过程中不断翻动聚苯乙烯颗粒直至所有颗粒表面均包覆了一层水玻璃溶液,然后静置10~15min,以提高包覆层的粘度及流变性。
进一步地,步骤4)中,将包覆了水玻璃溶液的聚苯乙烯颗粒倒入粉料沸腾槽的筛网上,底部进气管7中通入70℃~80℃的二氧化碳气体3~5min,使聚苯乙烯颗粒表面均匀包裹一层混合粉料。
进一步地,步骤5)中,重复上述步骤3)和步骤4)2~3次,即获得表面包覆了壳壁的颗粒坯料。
进一步地,步骤6)中,将颗粒坯料放置于密闭的长方体形的不锈钢成形模具中,模具上开设有排气孔,向模具中加入颗粒坯料,加入的颗粒坯料体积为不锈钢成形模具内腔容积的1/2~2/3;将模具放置于电炉中从室温开始随炉升温,首先以3~5℃/min的速度升温至600℃并恒温30min,然后以20~25℃/min的速度升温至1285℃并恒温30min,然后随炉冷却至室温,开模即可获得成形的轻质多孔净污载体,如图3所示。
本实施例步骤6)中,加入的颗粒坯料体积为不锈钢成形模具内腔容积的1/2或2/3;将模具放置于电炉中从室温开始随炉升温,首先以3或5℃/min的速度升温至600℃并恒温30min,然后以20或25℃/min的速度升温至1285℃并恒温30min。
本发明的工作原理
本发明制备的材料主要包括灰渣、高岭土、氧化铁、氧化铝、硬脂酸、短切玻璃纤维、可发泡聚苯乙烯颗粒和水玻璃溶液,其中灰渣和高岭土是主要烧结骨架材料;氧化铁和氧化铝作为助溶剂,用于调节烧结温度;硬脂酸的熔点为70℃,气化温度383℃,用作烧结前壳壁粉料的粘结剂以提高颗粒坯料的表面强度;短切玻璃纤维作为壳壁的纤维增强材料,用于提高烧结过程中壳壁的强度,避免烧结时出现塌陷;可发泡聚苯乙烯可在水蒸气或直接加热条件下发生体积胀大,完全发泡后的体积可增大80~100倍,气化温度为330℃~380℃;水玻璃溶液具有较好的粘性和成膜性,在二氧化碳作用下可快速固化生成膜,用于将粉料固定于颗粒表面。
可发泡聚苯乙烯颗粒经过预发泡后,粒径增大10~30倍,表面喷涂了水玻璃溶液后,在粉体沸腾槽3中可将混合粉料6粘附于表层。由于粉体沸腾槽3底部通入的是70℃~80℃的二氧化碳气体,水玻璃快速固化成膜,从而将聚苯乙烯表面的粉料层牢固固定于其表面。同时粉料层中的硬脂酸发生熔化,可将各种粉料粘结成牢固的外壳。经过多次反复成壳后,聚苯乙烯颗粒外壳厚度逐步增加。
颗粒坯料4在电炉内加热初期(低于350℃),升温速度较慢,颗粒坯料4芯部的聚苯乙烯继续膨胀,由于此时外壳强度不高,在内部强大的膨胀力作用下外壳破裂,颗粒坯料4内的聚苯乙烯继续膨胀和溢出,并相互连接。颗粒坯料在模具型腔内成形。
颗粒坯料4在电炉内加热中期(350℃~600℃),颗粒坯料4内的聚苯乙烯及壳壁1内的硬脂酸逐步气化,此时由壳壁搭接而成的骨架结构已经形成,但强度较低,水玻璃膜及玻璃纤维继续对壳壁1提供强度支持,以保证骨架结构不发生变形。
颗粒坯料4在电炉内加热中期(600℃~1285℃),这一段升温速度较快,壳壁1中的各组分开始烧结粘结,同时各颗粒坯料4之间也相互烧结连接,冷却至室温后壳壁1强度快速升高,开模后即可获得具有一定形状的轻质多孔载体。
实施例二
与实施例一不同的是,本实施例步骤2)中,将直径为0.5mm的可发性聚苯乙烯颗粒放置于密闭容器中,通入110或120℃的水蒸气加热3或5min,将聚苯乙烯颗粒预发泡至7-10mm并在空气中冷却至室温。
步骤6)中,将颗粒坯料放置于密闭的圆柱形的不锈钢成形模具中,模具上开设有排气孔,向模具中加入颗粒坯料,加入的颗粒坯料体积为不锈钢成形模具内腔容积的7/12;将模具放置于电炉中从室温开始随炉升温,首先以4℃/min的速度升温至600℃并恒温30min,然后以22℃/min的速度升温至1285℃并恒温30min,然后随炉冷却至室温,开模即可获得成形的轻质多孔净污载体,如图4所示。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和变形,这些改进和变形也应视为本发明的保护范围。
Claims (9)
1.一种具有高比表面积的轻质多孔净污载体,其特征在于,包括壳壁,所述壳壁为若干个曲面薄壁相互连接而成的骨架状结构,所述壳壁内部有多个相互连通的孔洞,所述壳壁材质包括灰渣、高岭土、氧化铁、氧化铝、硅酸钠和玻璃纤维。
2.根据权利要求1所述的一种具有高比表面积的轻质多孔净污载体,其特征在于,所述壳壁的壁厚2~5mm。
3.一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,包括以下步骤:
1)先将灰渣球研磨分散,再将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维放入烘箱中烘干,然后将将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维进行均匀混合获得混合粉料,将混合粉料倒入粉料沸腾槽中;
2)将可发性聚苯乙烯颗粒放置于密闭容器中,通入水蒸气加热,将聚苯乙烯颗粒预发泡并在空气中冷却至室温;
3)向预发泡的聚苯乙烯颗粒表面喷洒水玻璃溶液,喷洒过程中不断翻动聚苯乙烯颗粒直至所有颗粒表面均包覆了一层水玻璃溶液,然后静置一段时间以提高包覆层的粘度及流变性;
4)将包覆了水玻璃溶液的聚苯乙烯颗粒倒入粉料沸腾槽的筛网上,进气管中通入二氧化碳气体一段时间,使聚苯乙烯颗粒表面均匀包裹一层混合粉料;
5)重复上述步骤3)和步骤4)若干次,即获得表面包覆了壳壁的颗粒坯料;
6)将颗粒坯料放置于密闭不锈钢成形模具中,模具上开设有排气孔,加入颗粒坯料;将模具放置于电炉中从室温开始随炉升温,然后再随炉冷却至室温,开模即可获得成形的轻质多孔净污载体。
4.根据权利要求3所述的一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,步骤1)中,先将灰渣球研磨分散至20~30目,再将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和长度为4~6mm的短切玻璃纤维放入烘箱中60℃的烘干2~3h,然后将灰渣、高岭土、氧化铁、氧化铝、硬脂酸和短切玻璃纤维按重量比70:25:2:2:0.5:0.5进行均匀混合获得混合粉料,将混合粉料倒入粉料沸腾槽中。
5.根据权利要求3所述的一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,步骤2)中,将直径为0.4~0.5mm的可发性聚苯乙烯颗粒放置于密闭容器中,通入100~130℃的水蒸气加热2~6min,将聚苯乙烯颗粒预发泡至6~12mm并在空气中冷却至室温。
6.根据权利要求3所述的一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,步骤3)中,向预发泡的聚苯乙烯颗粒表面喷洒模数为2.5~3.0的水玻璃溶液,喷洒过程中不断翻动聚苯乙烯颗粒直至所有颗粒表面均包覆了一层水玻璃溶液,然后静置10~15min,以提高包覆层的粘度及流变性。
7.根据权利要求3所述的一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,步骤4)中,将包覆了水玻璃溶液的聚苯乙烯颗粒倒入粉料沸腾槽的筛网上,底部进气管7中通入70℃~80℃的二氧化碳气体3~5min,使聚苯乙烯颗粒表面均匀包裹一层混合粉料。
8.根据权利要求3所述的一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,步骤5)中,重复上述步骤3)和步骤4)2~3次,即获得表面包覆了壳壁的颗粒坯料。
9.根据权利要求3所述的一种具有高比表面积的轻质多孔净污载体的制备方法,其特征在于,步骤6)中,将颗粒坯料放置于密闭的不锈钢成形模具中,模具上开设有排气孔,向模具中加入颗粒坯料,加入的颗粒坯料体积为不锈钢成形模具内腔容积的1/2~2/3;将模具放置于电炉中从室温开始随炉升温,首先以3~5℃/min的速度升温至600℃并恒温30min,然后以20~25℃/min的速度升温至1285℃并恒温30min,然后随炉冷却至室温,开模即可获得成形的轻质多孔净污载体。
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