CN116573950A - 一种利用粉煤灰和锂渣合成的发泡陶瓷及其制备方法 - Google Patents
一种利用粉煤灰和锂渣合成的发泡陶瓷及其制备方法 Download PDFInfo
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- CN116573950A CN116573950A CN202310470119.4A CN202310470119A CN116573950A CN 116573950 A CN116573950 A CN 116573950A CN 202310470119 A CN202310470119 A CN 202310470119A CN 116573950 A CN116573950 A CN 116573950A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 58
- 239000010881 fly ash Substances 0.000 title claims abstract description 57
- 239000002893 slag Substances 0.000 title claims abstract description 56
- 239000000919 ceramic Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000004088 foaming agent Substances 0.000 claims abstract description 21
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 19
- 229910052656 albite Inorganic materials 0.000 claims abstract description 18
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000000454 talc Substances 0.000 claims abstract description 15
- 235000012222 talc Nutrition 0.000 claims abstract description 15
- 229910052623 talc Inorganic materials 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 238000001238 wet grinding Methods 0.000 claims abstract description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 19
- 239000011734 sodium Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 229910052708 sodium Inorganic materials 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- 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 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 18
- 238000009826 distribution Methods 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000002269 spontaneous effect Effects 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 238000009827 uniform distribution Methods 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000010433 feldspar Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- Compositions Of Oxide Ceramics (AREA)
Abstract
本发明涉及一种利用粉煤灰和锂渣合成的发泡陶瓷及其制备方法,包括步骤:将粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂均匀混合,利用球磨机湿磨制成浆料;喷雾造粒,得到粉体颗粒,煅烧处理;冷却得到发泡陶瓷材料。本发明的有益效果是:将锂渣与粉煤灰按一定配比复配使用,锂渣在较低温度下形成的熔融体可发挥迁移和渗透作用进行原料纵向高度的自发排列,导致最终烧成温度下熔融体的表面张力在不同区域具备一定的差异性;该差异性的存在有利于消除发泡陶瓷中气孔在形成、生长与分布方面的阻力变化,实现纵向结构的均匀分布;可同时实现粉煤灰与锂渣的大掺量高值化应用,有效解决因粉煤灰堆积和锂渣存放导致的环境污染问题。
Description
技术领域
本发明属于粉煤灰基建筑材料制备领域,尤其涉及一种利用粉煤灰和锂渣合成的发泡陶瓷及其制备方法。
背景技术
发泡陶瓷作为墙体保温材料,具有轻质、隔音、高强、环保等优点;相比于传统有机保温材料,其耐高温和耐久性优势明显。发泡陶瓷的合成所需原料多种多样,目前工业上主要是将尾矿作为原料,添加石英、粘土和长石等优质的硅酸盐材料作为其基础原料,以碳化硅、碳黑等作为其发泡剂,添加硼酸、三氧化二锑等作为助熔剂和稳泡剂烧结而成。
粉煤灰是我国燃煤电厂的固体废弃物,存量庞大。粉煤灰中富含丰富的Al2O3和SiO2,两者含量在60%以上,主要以莫来石、刚玉、非晶态二氧化硅、铝硅酸盐玻璃相等形式存在,具备制备铝硅发泡陶瓷材料的基本化学组成。但目前以粉煤灰为原料制备的发泡陶瓷材料,会因粉煤灰原料本身复杂的晶相、不均匀的成分分布、不规则的晶粒形状以及原料本身的重量压迫导致产品内部气孔差异较大,特别是纵向气孔尺寸分布的均一性难以保证,导致产品性能不佳。
锂渣是指在碳酸锂生产过程中排放的一种工业废渣。当前随着锂电池的高速发展,碳酸锂的需求不断增加,相应的锂渣成为我国高速增长的固体废弃物之一。锂渣中含有大量的二氧化硅和氧化铝、一定量的氧化铁以及微量的锂、氟等元素,直接用于发泡陶瓷的制备时,坯体熔融温度低,难以形成结构稳定的骨架。
当前在改善发泡陶瓷纵向结构均匀性方面,有研究者通过在原料中引入分散剂进而提高发泡剂的整体分散均匀性;有研究者通过分层分区布料,在模具的中心区域和外侧区域,以及上层和下层,分别放置不同发泡剂含量的原料,克服气泡生长阻力;也有研究者通过引入优化剂改善高温熔融体黏度,降低气泡生长阻力。然而这些操作要么需要引入高价原料,增加产品成本;要么操作复杂,不利于实际生产应用。
因此,亟需一种新的制备方法,用以制备发泡陶瓷,以解决上述问题。
发明内容
本发明的目的是克服现有技术中的不足,提供一种利用粉煤灰和锂渣合成的发泡陶瓷及其制备方法。
这种利用粉煤灰和锂渣合成的发泡陶瓷制备方法,包括以下步骤:
步骤一、将粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂均匀混合,利用球磨机湿磨制成浆料;浆料中水的重量百分比为10~60%;
步骤二、将所述浆料进行喷雾造粒,得到粉体颗粒,将粉体颗粒充填到模具中,进行空气气氛下的煅烧处理;烧结温度为1180~1300℃,并保温15~180min;
步骤三、自然冷却,依照所需尺寸进行切割得到发泡陶瓷材料。
作为优选,步骤一中,粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂的比例具体为:按重量份计具体为,40~80份粉煤灰,10~40份锂渣,0~20份滑石,5~35份钠长石,5~35份钾长石,0.2~5份发泡剂。
作为优选,所述粉煤灰包括SiO2、Al2O3、Fe2O3、CaO和镁、钾、钠元素的氧化物;按重量份计具体为,40~80份SiO2,10~40份Al2O3,2~10份Fe2O3,4~8份CaO,镁、钾、钠元素的氧化物重量占比为5~15%。
作为优选,所述滑石包括SiO2、MgO、Fe2O3和CaO;按重量份计具体为,15~80份SiO2,20~50份MgO,0~1份Fe2O3,0~1份CaO。
作为优选,所述钠长石包括SiO2、Al2O3、Fe2O3、CaO、K2O和Na2O;按重量份计具体为,40~80份SiO2,10~30份Al2O3,0~2份Fe2O3,0~5份CaO,1~4份K2O,4~15份Na2O。
作为优选,所述钾长石包括SiO2、Al2O3、Fe2O3、CaO、K2O和Na2O;按重量份计具体为,40~80份SiO2,10~30份Al2O3,0~2份Fe2O3,0~5份CaO,4~15份K2O,1~4份Na2O。
作为优选,所述发泡剂包括碳化硅、氧化铁、二氧化锰、碳酸钙、碳酸钠、碳酸锂、石墨和氮化硅中的一种或多种。
利用粉煤灰和锂渣合成的发泡陶瓷,由上述任一所述方法得到的。
本发明的有益效果是:
1)本发明将锂渣与粉煤灰按一定配比复配使用,锂渣在较低温度下形成的熔融体可发挥迁移和渗透作用进行原料纵向高度的自发排列,导致最终烧成温度下熔融体的表面张力在不同区域具备一定的差异性;该差异性的存在有利于消除发泡陶瓷中气孔在形成、生长与分布方面的阻力变化,实现纵向结构的均匀分布。
2)本发明引入锂渣,还可以减少原料中作为助熔剂的钠长石和钾长石的用量,降低产品的原料成本;并与粉煤灰发挥固废协同作用,在较低的烧结温度下得到密度小、抗压强度高的大掺量固废基发泡陶瓷材料。
3)本发明所得发泡陶瓷产品原料来源丰富且成本低,合成工艺简单且能耗低;该产品可通过发挥锂渣与粉煤灰的固废协同作用提高性能,兼顾高的纵向结构均匀性和低的体积密度,产品综合性能优异,具有显著的市场竞争力。
4)本发明可同时实现粉煤灰与锂渣的大掺量高值化应用,有效解决因粉煤灰堆积和锂渣存放导致的环境污染问题。
附图说明
图1为实施例三中制备所得发泡陶瓷材料的截面照片;
图2为对比例一所得发泡陶瓷材料的截面照片。
具体实施方式
下面结合实施例对本发明做进一步描述。下述实施例的说明只是用于帮助理解本发明。应当指出,对于本技术领域的普通人员来说,在不脱离本发明原理的前提下,还可以对本发明进行若干修饰,这些改进和修饰也落入本发明权利要求的保护范围内。
实施例一
利用粉煤灰和锂渣合成的发泡陶瓷制备方法,包括以下步骤:
步骤一、将粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂均匀混合,粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂的比例具体为:按重量份计具体为,40~80份粉煤灰,10~40份锂渣,0~20份滑石,5~35份钠长石,5~35份钾长石,0.2~5份发泡剂。
所述粉煤灰包括SiO2、Al2O3、Fe2O3、CaO和镁、钾、钠元素的氧化物;按重量份计具体为,40~80份SiO2,10~40份Al2O3,2~10份Fe2O3,4~8份CaO,镁、钾、钠元素的氧化物重量占比为5~15%。
所述滑石包括SiO2、MgO、Fe2O3和CaO;按重量份计具体为,15~80份SiO2,20~50份MgO,0~1份Fe2O3,0~1份CaO。
所述钠长石包括SiO2、Al2O3、Fe2O3、CaO、K2O和Na2O;按重量份计具体为,40~80份SiO2,10~30份Al2O3,0~2份Fe2O3,0~5份CaO,1~4份K2O,4~15份Na2O。
所述钾长石包括SiO2、Al2O3、Fe2O3、CaO、K2O和Na2O;按重量份计具体为,40~80份SiO2,10~30份Al2O3,0~2份Fe2O3,0~5份CaO,4~15份K2O,1~4份Na2O。
所述发泡剂包括碳化硅、氧化铁、二氧化锰、碳酸钙、碳酸钠、碳酸锂、石墨和氮化硅中的一种或多种。
将上述原料利用球磨机湿磨制成浆料;浆料中水的重量百分比为10~60%;
步骤二、将所述浆料进行喷雾造粒,得到粉体颗粒,将粉体颗粒充填到模具中,进行空气气氛下的煅烧处理;烧结温度为1180~1300℃,并保温15~180min;
步骤三、自然冷却,依照所需尺寸进行切割,即可得到发泡陶瓷材料。
实施例二
作为另一种实施例,实施例一中提出的利用粉煤灰和锂渣合成的发泡陶瓷制备方法的具体实施例,包括以下步骤:
步骤一、将粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂均匀混合,其中按重量份计粉煤灰60份,锂渣10份,滑石9.5份,钠长石5份,钾长石15份,发泡剂为碳化硅0.5份;利用球磨机湿磨制成浆料;浆料中水的重量百分比为50%;
步骤二、将所述浆料进行喷雾造粒,得到粉体颗粒,将粉体颗粒充填到模具中,进行空气气氛下的煅烧处理;烧结温度为1210℃,保温时间为20min;
步骤三、自然冷却,依照所需尺寸进行切割得到发泡陶瓷材料;检测后得到发泡陶瓷材料产品密度为0.38g/cm3,抗压强度为2.27MPa。
实施例三
作为另一种实施例,本实施例中根据实施例二中提出的具体实施例,将步骤一中粉煤灰和锂渣的重量份分别修改为50份和20份,最终得到的发泡陶瓷材料,其微观形貌的截面照片如图1所示,内部布满闭孔,孔径尺寸集中,整体分布均匀。
检测后得到这种发泡陶瓷材料产品密度为0.34g/cm3,抗压强度为2.49MPa。
实施例四
实施例四,作为另一种实施例,本实施例中根据实施例二中提出的具体实施例,将步骤一中粉煤灰和锂渣的重量份分别修改为40份和30份,得到的发泡陶瓷材料密度为0.33g/cm3,抗压强度为2.73MPa。
结合实施例二和实施例三中的检测结果,可以看出,随着发泡陶瓷制备原材料中粉煤灰和锂渣的比例变化,制备得到的发泡陶瓷的材料密度和抗压强度发生一定趋势的变化,具体为:
当其它条件均相同的前提下,而粉煤灰的比重降低,锂渣的比重提升时,发泡陶瓷的材料密度减小,而抗压强度增强;
当其它条件均相同的前提下,而粉煤灰的比重提升,锂渣的比重降低时,发泡陶瓷的材料密度增大,而抗压强度减弱。
实施例五
作为另一种实施例,本实施例中提出实施例一中所述方法制备得到的利用粉煤灰和锂渣合成的发泡陶瓷,所述发泡陶瓷的密度为0.30~0.70g/cm3,抗压强度为1.5~3.0MPa。
对比例一
作为一种对比例,根据实施例二中提出的具体实施例,在步骤一中不加入锂渣,并将粉煤灰的重量份修改为70份,即相当于保持粉煤灰和锂渣的总占比不变,只是其中锂渣的占比为0,最终得到的发泡陶瓷材料,其样品截面照片如图2所示。
将图2与图1对比,可以看出图2中的样品截面内部布满闭孔,但孔径分布范围较大,纵向方向孔结构均匀性较差。
检测后得到发泡陶瓷材料产品密度为0.45g/cm3,抗压强度为2.29Mpa,也符合实施例四中所总结的材料密度和抗压强度的变化趋势。
将本对比例与实施例二至四中制备的发泡陶瓷性能比较后得到:与现有技术相比,本发明在相同的烧结温度下可得到密度更小、气孔纵向分布更为均匀的发泡陶瓷材料,充分利用了粉煤灰与锂渣的固废协同作用,克服了粉煤灰基发泡陶瓷合成过程中纵向结构不均匀的问题,提高了产品的孔径分布均匀性及抗压强度。
且由于本发明利用锂渣作为发泡陶瓷的原材料之一,实现了锂渣的回收利用,充分利用其低廉的经济优势可实现产品原料成本的进一步降低,具有极高的经济效益。
对比例二
作为另一种对比例,根据实施例一中提出的方法,制备发泡陶瓷:
步骤一、粉煤灰50份,滑石9.5份,钠长石10份,钾长石30份,发泡剂为碳化硅0.5份均匀混合;利用球磨机湿磨制成浆料;浆料中水的重量百分比为50%;
步骤二、将所述浆料进行喷雾造粒,得到粉体颗粒,将粉体颗粒充填到模具中,进行空气气氛下的煅烧处理;烧结温度为1240℃,保温时间为20min;
步骤三、自然冷却,依照所需尺寸进行切割得到发泡陶瓷材料;检测后得到发泡陶瓷材料产品密度为0.35g/cm3,抗压强度为1.02MPa。
对比实施例三中得到的发泡陶瓷,发现两种方法得到的材料密度相近,但使用本发明提出的方法制得的发泡陶瓷的抗压强度有着显著提升。可见提升原材料中固体废弃物即粉煤灰与锂渣的整体掺量,并使用稍低的烧结温度,即使降低钠长石和钾长石的掺量,依旧能够得到抗压强度更高的发泡陶瓷。因此本发明能够通过提升固体废弃物的掺量生产质量更高的发泡陶瓷,且能够有效降低对钠长石和钾长石的需求,有效降低生产成本,具有很高的经济效益。
Claims (8)
1.一种利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,包括以下步骤:
步骤一、将粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂均匀混合,利用球磨机湿磨制成浆料;浆料中水的重量百分比为10~60%;
步骤二、将所述浆料进行喷雾造粒,得到粉体颗粒,将粉体颗粒充填到模具中,进行空气气氛下的煅烧处理;烧结温度为1180~1300℃,并保温15~180min;
步骤三、自然冷却,依照所需尺寸进行切割得到发泡陶瓷材料。
2.根据权利要求1所述的利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,步骤一中,粉煤灰、锂渣、滑石、钠长石、钾长石和发泡剂的比例具体为:按重量份计,40~80份粉煤灰,10~40份锂渣,0~20份滑石,5~35份钠长石,5~35份钾长石,0.2~5份发泡剂。
3.根据权利要求2所述的利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,所述粉煤灰包括SiO2、Al2O3、Fe2O3、CaO和镁、钾、钠元素的氧化物;按重量份计具体为,40~80份SiO2,10~40份Al2O3,2~10份Fe2O3,4~8份CaO,镁、钾、钠元素的氧化物重量占比为5~15%。
4.根据权利要求2所述的利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,所述滑石包括SiO2、MgO、Fe2O3和CaO;按重量份计具体为,15~80份SiO2,20~50份MgO,0~1份Fe2O3,0~1份CaO。
5.根据权利要求2所述的利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,所述钠长石包括SiO2、Al2O3、Fe2O3、CaO、K2O和Na2O;按重量份计具体为,40~80份SiO2,10~30份Al2O3,0~2份Fe2O3,0~5份CaO,1~4份K2O,4~15份Na2O。
6.根据权利要求2所述的利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,所述钾长石包括SiO2、Al2O3、Fe2O3、CaO、K2O和Na2O;按重量份计具体为,40~80份SiO2,10~30份Al2O3,0~2份Fe2O3,0~5份CaO,4~15份K2O,1~4份Na2O。
7.根据权利要求2所述的利用粉煤灰和锂渣合成的发泡陶瓷制备方法,其特征在于,所述发泡剂包括碳化硅、氧化铁、二氧化锰、碳酸钙、碳酸钠、碳酸锂、石墨和氮化硅中的一种或多种。
8.利用粉煤灰和锂渣合成的发泡陶瓷,其特征在于,由权利要求1至7中任一所述方法得到的。
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