CN116217248A - 一种低成本长寿命中包挡渣墙及制备方法 - Google Patents
一种低成本长寿命中包挡渣墙及制备方法 Download PDFInfo
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- 239000000463 material Substances 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052609 olivine Inorganic materials 0.000 claims abstract description 14
- 239000010450 olivine Substances 0.000 claims abstract description 14
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 13
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- 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 abstract description 5
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 5
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 8
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 5
- 229910052839 forsterite Inorganic materials 0.000 abstract description 4
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
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- 239000000126 substance Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 description 1
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- 229940005740 hexametaphosphate Drugs 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种低成本长寿命中包挡渣墙及制备方法，其包括主料和辅料；所述主料各原料的质量百分含量为：橄榄石54%～60%、镁砂35%～40%、硅灰3.5%～4%、氧化铬绿1%～2.5%；所述辅料各原料占主料总重的配比为：六偏磷酸钠0.10%～0.15%、防爆纤维0.08%～0.12%、钢纤维1%～1.2%。本挡渣墙充分利用镁橄榄石浇注料高温热抗折强度高的优势，引入高熔点、抗渣侵蚀性能优良的氧化铬绿，弥补低成本橄榄石在高温条件下非均质液相较多的缺陷，提高了整个机体的耐火度，增强了挡渣墙的综合使用性能；通过引入氧化铬绿微粉避免了烘烤过程中的开裂现象，提高了挡渣墙的抗渣性能，保证了挡渣墙高的使用寿命。
Description
技术领域
本发明涉及一种炼钢用耐火材料，尤其是一种低成本长寿命中包挡渣墙及制备方法。
背景技术
中间包作为钢水冶炼过程中最后的容器，其冶金功能已尤为突出，如何提高钢水产量和质量仍是中间包耐材需要讨论的重要内容。中间包挡渣墙在控制流场和温度场方面起着重要的作用，延长钢水在中包内的停留时间，充分进行热交换和夹杂物碰撞、聚集、上浮，均匀温度和钢水成分，提高钢坯质量。
中间包挡渣墙普遍采用耐火浇注料浇注成型,材质有刚玉质、铝镁质等，经过养护、脱模、烘烤等工艺制成预制件后在中间包上安装使用。使用上述材质虽然已经成熟，但是随着钢厂整合的大趋势的进行，耐火材料市场竞争激烈，中包耐材的承包价格不断下降，而且铝矾土、镁砂等耐火材料原料价格不断上涨，造成了中包耐材制品包括挡渣墙等预制件成本压力增大，企业的盈利空间被进一步压缩。
发明内容
本发明要解决的技术问题是提供一种低成本长寿命中包挡渣墙；本发明还提供了一种低成本长寿命中包挡渣墙的制备方法。
为解决上述技术问题，本发明所采取的技术方案是：其包括主料和辅料；所述主料各原料的质量百分含量为：橄榄石54%～60%、镁砂35%～40%、硅灰3.5%～4%、氧化铬绿1%～2.5%；所述辅料各原料占主料总重的配比为：六偏磷酸钠0.10%～0.15%、防爆纤维0.08%～0.12%、钢纤维1%～1.2%。
进一步的，所述橄榄石的粒径为1mm≤粒径≤8mm。更进一步的，各粒径的橄榄石在主料中的的质量百分含量为：5mm＜粒径≤8mm 30%～35%；3mm＜粒径≤5mm 5%～10%；1mm≤粒径≤3mm 15%～18%。
进一步的，所述镁砂采用两种粒径，分别为粒径≤1mm和粒径≤200目。更进一步的，各粒径的镁砂在主料中的的质量百分含量为：粒径≤1mm 17%～20%；粒径≤200目 18%～20%。
进一步的，所述氧化铬绿粒径≤5μm。
本发明方法为：所述主料和辅料加水搅匀后，在模具中成模；成模后的挡渣墙带模进行养护、脱模；脱模后的挡渣墙经高温烘干，即得所述挡渣墙。
进一步的，所述养护温度80～100℃，养护时间12～14h。
进一步的，所述高温烘干温度280～300℃，烘干时间3～6h。
采用上述技术方案所产生的有益效果在于：
（1）本发明使用低成本的镁橄榄石为主要原料，引入氧化铬提高橄榄石浇注料的抗渣侵蚀性能，从而提高中包使用寿命，降本增效；
（2）本发明充分利用镁橄榄石浇注料高温热抗折强度高的优势，引入高熔点、抗渣侵蚀性能优良的氧化铬绿，弥补低成本橄榄石在高温条件下非均质液相较多的缺陷，提高了整个机体的耐火度，增强了挡渣墙的综合使用性能；通过引入氧化铬绿微粉，一方面提高挡渣墙的强度，避免烘烤过程中的开裂现象，另一方面利用氧化铬绿微粉的良好的高温性能，提高挡渣墙的抗渣性能，与橄榄石浇注料高温抗折高的性能相结合，保证挡渣墙高的使用寿命；
（3）使用含铬绿镁橄榄石浇注料，成本要比传统的铝镁浇注料低800元/吨～1000元/吨，大大降低了成本，提高产品的竞争能力；
（4）尤其是采用不同粒径的微粉，能够有效填充浇注料的空隙，增加浇注料的密实度，提高其常温强度，能够有效避免预制件的开裂，提高产品的成品率。
具体实施方式
下面结合具体实施方式对本发明作进一步详细的说明。
本低成本长寿命中包挡渣墙原料设计原理：橄榄石浇注料属于镁硅***，本身具有优良的高温性能，但是目前所使用的橄榄石成分较杂，挡渣墙在使用的过程中，抗渣性能有很大下降。通过引入氧化铬绿这一高温物相，与基质（细粉）中的氧化镁在900℃左右开始生成镁铬尖晶石，提高浇注料的抗渣性能，而不明显降低浇注料的耐火度。
本低成本长寿命中包挡渣墙的原料包括主料和辅料；所述主料各原料的质量百分含量为：橄榄石54%～60%、镁砂35%～40%、硅灰3.5%～4%、氧化铬绿1%～2.5%；所述辅料各原料占主料总重的配比为：六偏磷酸钠0.10%～0.15%、防爆纤维0.08%～0.12%、钢纤维1%～1.2%。所采用的主要原料的化学组成见表1；
表1：主要原料的化学组成（w/%）
优选的，各原料的配比见表2；
表2：挡渣墙原料的配比
表2中，主料总和100%，辅料六偏磷酸钠、防爆纤维和钢纤维的配比按与主料总重的配比计算；所述硅灰最好采用埃肯951u。
本低成本长寿命中包挡渣墙的制备方法采用步骤：（1）取合格原料按照配比准确称重，放入强制式搅拌机，干搅至少5min；（2）在搅拌机中进行加水，加水量为原料总重的4.5%～5wt%，湿搅至少5min，使料浆充分搅匀、无生料；（3）卸料，放入到挡渣墙模具中，使用振动平台进行振动，使浇注料泛浆、排出气泡、充分振实，放到成型区静置至少2h；（4）将挡渣墙带模放入养护窑中，养护温度（窑温）80℃～100℃、养护12～14h，脱模，防止磕碰；（5）将脱模后的挡渣墙送入高温窑中，按照升温曲线进行升温，最终达到高温烘干温度280～300℃、进行烘干3～6h；最终出窑即得成品。
实施例1-6：本低成本长寿命中包挡渣墙及制备方法具体如下所述。
（1）各实施例原料的成分配比见表3；
表3：各实施例原料的成分配比（wt）
表3中，D为粒径，六偏为六偏磷酸钠；辅料的配比按主料总重计算。
（2）采用上述工艺过程，各实施例具体的工艺参数见表4；
表4：各实施例的工艺参数
（3）对比实验：上述实施例1-6所得挡渣墙的使用时间和下线侵蚀情况见表5。选用常规挡渣墙作为对比，常规挡渣墙的使用时间和下线侵蚀情况见表5。
表5：实施例和对比例的使用效果
由表5可见，本挡渣墙的使用时间明显变长，且下线侵蚀情况明显变好。
Claims (9)
1.一种低成本长寿命中包挡渣墙，其特征在于，其包括主料和辅料；所述主料各原料的质量百分含量为：橄榄石54%～60%、镁砂35%～40%、硅灰3.5%～4%、氧化铬绿1%～2.5%；所述辅料各原料占主料总重的配比为：六偏磷酸钠0.10%～0.15%、防爆纤维0.08%～0.12%、钢纤维1%～1.2%。
2.根据权利要求1所述的一种低成本长寿命中包挡渣墙，其特征在于：所述橄榄石的粒径为1mm≤粒径≤8mm。
3.根据权利要求2所述的一种低成本长寿命中包挡渣墙，其特征在于：各粒径的橄榄石在主料中的的质量百分含量为：5mm＜粒径≤8mm 30%～35%；3mm＜粒径≤5mm 5%～10%；1mm≤粒径≤3mm 15%～18%。
4.根据权利要求1所述的一种低成本长寿命中包挡渣墙，其特征在于：所述镁砂采用两种粒径，分别为粒径≤1mm和粒径≤200目。
5.根据权利要求4所述的一种低成本长寿命中包挡渣墙，其特征在于：各粒径的镁砂在主料中的的质量百分含量为：粒径≤1mm 17%～20%、粒径≤200目 18%～20%。
6.根据权利要求1-5任意一项所述的一种低成本长寿命中包挡渣墙，其特征在于：所述氧化铬绿粒径≤5μm。
7.权利要求1-6任意一项所述一种低成本长寿命中包挡渣墙的制备方法，其特征在于：所述主料和辅料加水搅匀后，在模具中成模；成模后的挡渣墙带模进行养护、脱模；脱模后的挡渣墙经高温烘干，即得所述挡渣墙。
8.根据权利要求7所述的一种低成本长寿命中包挡渣墙的制备方法，其特征在于：所述养护温度80～100℃，养护时间12～14h。
9.根据权利要求7或8所述的一种低成本长寿命中包挡渣墙的制备方法，其特征在于：所述高温烘干温度280～300℃，烘干时间3～6h。
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