CN116947508A - 一种水泥窑烧成带用抗硫镁铝尖晶石砖及方法 - Google Patents
一种水泥窑烧成带用抗硫镁铝尖晶石砖及方法 Download PDFInfo
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- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 73
- 239000011029 spinel Substances 0.000 title claims abstract description 73
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000011449 brick Substances 0.000 title claims abstract description 62
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000011593 sulfur Substances 0.000 title claims abstract description 44
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 44
- 238000005526 cement kiln firing Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 27
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 19
- 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 claims abstract description 18
- 239000013535 sea water Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 7
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- -1 magnesium aluminate Chemical class 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- SMDQFHZIWNYSMR-UHFFFAOYSA-N sulfanylidenemagnesium Chemical compound S=[Mg] SMDQFHZIWNYSMR-UHFFFAOYSA-N 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 12
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Abstract
本发明提供一种水泥窑烧成带用抗硫镁铝尖晶石砖及方法。所述水泥窑烧成带用抗硫镁铝尖晶石砖制备方法包括以下步骤：S1.将镁铝尖晶石颗粒、镁铝尖晶石微粉、高纯度海水氧化镁微粉、硅灰、董青石颗粒、结合剂、外加剂和水进行混合，得到混料；S2.将混料进行压制成型，得到砖胚，然后对砖胚进行脱模，进行潮湿养护，使得砖胚达到終凝。本发明提供的水泥窑烧成带用抗硫镁铝尖晶石砖及方法通过增加低热膨胀系数的堇青石的含量，提高了浇注料的抗热震因子，使得抗热震性得到明显改善，并且通过选用高纯度海水氧化镁，使得可以加强抗硫性的优点。
Description
技术领域
本发明属于水泥窑烧成带用抗硫镁铝尖晶石砖技术领域，尤其涉及一种水泥窑烧成带用抗硫镁铝尖晶石砖及方法。
背景技术
水泥回转窑经历了漫长的演变和发展过程，目前水泥工业窑炉主要由窑口、下过渡带、烧成带、下过渡带和安全带组成；由于烧成带和过渡带的工作环境较为恶劣，故而需要在烧成带和过渡带的窑壁上设置耐火砖。理想中的耐火砖需要具有以下特点：1)优异的挂窑皮性能；2)高抗热化学反应能力；3)优异的抗渣能力；4)优异的机械强度；5)优异的热震稳定性。
但是现有的水泥回转窑中往往对有各种产业废弃物的资源再利用和低品位原燃料的使用，使水泥窑炉成为工业垃圾的消费者，由于这些废弃物的燃烧使水泥窑中的碱、氯、硫循环量增大，对耐火材料的侵蚀会加剧，结皮问题更加严重。
因此，有必要提供一种新的水泥窑烧成带用抗硫镁铝尖晶石砖及方法解决上述技术问题。
发明内容
本发明解决的技术问题是提供一种通过增加低热膨胀系数的堇青石的含量，提高了浇注料的抗热震因子，使得抗热震性得到明显改善，并且通过选用高纯度海水氧化镁，使得可以加强抗硫性的水泥窑烧成带用抗硫镁铝尖晶石砖及方法。
为解决上述技术问题，本发明提供的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法包括以下步骤：
S1.将镁铝尖晶石颗粒、镁铝尖晶石微粉、高纯度海水氧化镁微粉、硅灰、董青石颗粒、结合剂、外加剂和水进行混合，得到混料；
S2.将混料进行压制成型，得到砖胚，然后对砖胚进行脱模，进行潮湿养护，使得砖胚达到終凝；
S3.对終凝的砖胚进行干燥、烧制和冷却，最终得到水泥窑烧成带用抗硫镁铝尖晶石砖。
作为本发明的进一步方案，所述结合剂为MgO微粉、Al2O3微粉、活性SiO2和H2O。
作为本发明的进一步方案，所述外加剂为三聚磷酸钠、六偏磷酸钠和聚羧酸系高效减水剂。
作为本发明的进一步方案，所述镁铝尖晶石颗粒的粒度为5-3mm、3-1mm和≤1mm，所述镁铝尖晶石微粉的粒度为≤0.010mm，所述高纯度海水氧化镁为d50＝5μm。
作为本发明的进一步方案，所述镁铝尖晶石的化学组成包括28.3％的MgO和71.7％的Al2O3，所述高纯度海水氧化镁的化学成分为98.6％的MgO，0.06％的Al2O3，0.81％的CaO，0.19％的SiO2和0.07％的Fe2O3，所述董青石颗粒≤1mm。
作为本发明的进一步方案，所述步骤S2的潮湿养护时间为24-48h，所述步骤S3的干燥的温度为110℃，时间为24h，烧制温度为1200℃，时间为3h，自然冷却到室温。
作为本发明的进一步方案，所述水泥窑烧成带用抗硫镁铝尖晶石砖的化学成分为0.21％的SiO2，11.2％的Al2O3，0.13％的Fe2O3，0.80％的CaO和87.1％的MgO。
作为本发明的进一步方案，所述镁铝尖晶石颗粒为54％，所述5-3mm的镁铝尖晶石颗粒占镁铝尖晶石颗粒的1/3，所述镁铝尖晶石微粉基质比为0.42，所述高纯度海水氧化镁微粉为2.8％。
作为本发明的进一步方案，所述硅灰为2.3％，所述董青石颗粒6％。
一种水泥窑烧成带用抗硫镁铝尖晶石砖，所述水泥窑烧成带用抗硫镁铝尖晶石砖通过水泥窑烧成带用抗硫镁铝尖晶石砖的制备方法制备而得。
与相关技术相比较，本发明提供的水泥窑烧成带用抗硫镁铝尖晶石砖及方法具有如下有益效果：
1、本发明通过增加低热膨胀系数的堇青石的含量，提高了浇注料的抗热震因子，使得抗热震性得到明显改善，并且通过选用高纯度海水氧化镁，使得可以加强抗硫性。
附图说明
为了便于本领域技术人员理解，下面结合附图对本发明作进一步的说明。
图1为本发明中堇青石的掺量的的示意图；
图2为本发明中镁铝尖晶石砖的截面示意图；
图3为本发明中镁铝尖晶石砖抗硫对比抗硫。
具体实施方式
请结合参阅图1、图2和图3，其中，图1为本发明中堇青石的掺量的的示意图；图2为本发明中镁铝尖晶石砖的截面示意图；图3为本发明中镁铝尖晶石砖抗硫对比抗硫。水泥窑烧成带用抗硫镁铝尖晶石砖制备方法包括以下步骤：
S1.将镁铝尖晶石颗粒、镁铝尖晶石微粉、高纯度海水氧化镁微粉、硅灰、董青石颗粒、结合剂、外加剂和水进行混合，得到混料；
S2.将混料进行压制成型，得到砖胚，然后对砖胚进行脱模，进行潮湿养护，使得砖胚达到終凝；
S3.对終凝的砖胚进行干燥、烧制和冷却，最终得到水泥窑烧成带用抗硫镁铝尖晶石砖。
所述结合剂为MgO微粉、Al2O3微粉、活性SiO2和H2O。
所述外加剂为三聚磷酸钠、六偏磷酸钠和聚羧酸系高效减水剂。
所述镁铝尖晶石颗粒的粒度为5-3mm、3-1mm和≤1mm，所述镁铝尖晶石微粉的粒度为≤0.010mm，所述高纯度海水氧化镁为d50＝5μm。
所述镁铝尖晶石的化学组成包括28.3％的MgO和71.7％的Al2O3，所述高纯度海水氧化镁的化学成分为98.6％的MgO，0.06％的Al2O3，0.81％的CaO，0.19％的SiO2和0.07％的Fe2O3，所述董青石颗粒≤1mm。
所述步骤S2的潮湿养护时间为24-48h，所述步骤S3的干燥的温度为110℃，时间为24h，烧制温度为1200℃，时间为3h，自然冷却到室温。
所述水泥窑烧成带用抗硫镁铝尖晶石砖的化学成分为0.21％的SiO2，11.2％的Al2O3，0.13％的Fe2O3，0.80％的CaO和87.1％的MgO。
所述镁铝尖晶石颗粒为54％，所述5-3mm的镁铝尖晶石颗粒占镁铝尖晶石颗粒的1/3，所述镁铝尖晶石微粉基质比为0.42，所述高纯度海水氧化镁微粉为2.8％。
所述硅灰为2.3％，所述董青石颗粒6％。
根据分析和实践经验，在常温性能优化试验中，镁铝尖晶石浇注料抗热震性能有所提高，可能是由于基质组成在高温下原位生成了堇青石结合相，但是堇青石相的结晶度不够或者含量较少，导致抗热震性欠佳，因此，在浇注料配料中加入预合成的堇青石颗粒和细粉作为次晶相，以进一步提高镁铝尖晶石浇注料的抗热震性，具体如图1所示。
用硫进行实验，所用的硫成分是将硫酸钙与鳞状石墨以3:1重量比混合而成的，将该混合物12g投入到制作的坩埚中，然后,将镁铝尖晶石砖切割成65mm四方形的砖设置在坩埚上，设置时要注意坩埚部分要埋入鳞状石墨中，用电炉加热到1200℃保持5h，加热后,自然冷却至室温，再加入硫酸钙和鳞状石墨的混合物，进行同样的热处理。将这种操作反复20次后,将设置在坩埚上的砖从中央切割,用SEM观察横截面，如图2所示，镁铝尖晶石砖中的CaSO4要少，是因为镁铝尖晶石砖含有CaO杂质，在工业炉中,该CaO与还原气氛气化的SO3反应，CaO从工作面一侧砖组织中释放出来，在工作面深处生成CaSO4，此时,由于CaO从组织中去除，产生组织破坏。
如图3所示，由左向右分别为传统的13NL、50S及本发明的镁铝尖晶石砖，很明显，13NL侵蚀最严重，其坩埚孔增大24％，坩埚壁减薄13.3％，侵蚀料粘结在坩埚孔内壁，50S的侵蚀相对较轻，少量侵蚀料粘结在坩埚孔底部，坩埚孔表面有很多鼓泡，而MA*侵蚀基本上不与侵蚀料反应，结果表明本发明的镁铝尖晶石砖浇注料的抗水泥物料和碱硫组分的侵蚀性最好。
本发明通过增加低热膨胀系数的堇青石的含量，提高了浇注料的抗热震因子，使得抗热震性得到明显改善，并且通过选用高纯度海水氧化镁，使得可以加强抗硫性。
一种水泥窑烧成带用抗硫镁铝尖晶石砖，所述水泥窑烧成带用抗硫镁铝尖晶石砖通过水泥窑烧成带用抗硫镁铝尖晶石砖的制备方法制备而得。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (10)
1.一种水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于，包括以下步骤：
S1.将镁铝尖晶石颗粒、镁铝尖晶石微粉、高纯度海水氧化镁微粉、硅灰、董青石颗粒、结合剂、外加剂和水进行混合，得到混料；
S2.将混料进行压制成型，得到砖胚，然后对砖胚进行脱模，进行潮湿养护，使得砖胚达到終凝；
S3.对終凝的砖胚进行干燥、烧制和冷却，最终得到水泥窑烧成带用抗硫镁铝尖晶石砖。
2.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述结合剂为MgO微粉、Al2O3微粉、活性SiO2和H2O。
3.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述外加剂为三聚磷酸钠、六偏磷酸钠和聚羧酸系高效减水剂。
4.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述镁铝尖晶石颗粒的粒度为5-3mm、3-1mm和≤1mm，所述镁铝尖晶石微粉的粒度为≤0.010mm，所述高纯度海水氧化镁为d50＝5μm。
5.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述镁铝尖晶石的化学组成包括28.3％的MgO和71.7％的Al2O3，所述高纯度海水氧化镁的化学成分为98.6％的MgO，0.06％的Al2O3，0.81％的CaO，0.19％的SiO2和0.07％的Fe2O3，所述董青石颗粒≤1mm。
6.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述步骤S2的潮湿养护时间为24-48h，所述步骤S3的干燥的温度为110℃，时间为24h，烧制温度为1200℃，时间为3h，自然冷却到室温。
7.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述水泥窑烧成带用抗硫镁铝尖晶石砖的化学成分为0.21％的SiO2，11.2％的Al2O3，0.13％的Fe2O3，0.80％的CaO和87.1％的MgO。
8.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述镁铝尖晶石颗粒为54％，所述5-3mm的镁铝尖晶石颗粒占镁铝尖晶石颗粒的1/3，所述镁铝尖晶石微粉基质比为0.42，所述高纯度海水氧化镁微粉为2.8％。
9.根据权利要求1所述的水泥窑烧成带用抗硫镁铝尖晶石砖制备方法，其特征在于：所述硅灰为2.3％，所述董青石颗粒6％。
10.一种水泥窑烧成带用抗硫镁铝尖晶石砖，其特征在于：所述水泥窑烧成带用抗硫镁铝尖晶石砖通过权利要求1-9中任意一项所述的制备方法制备而得。
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