CN107963897B - 一种高强型轻质耐火材料的制备方法 - Google Patents

一种高强型轻质耐火材料的制备方法 Download PDF

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CN107963897B
CN107963897B CN201711246567.7A CN201711246567A CN107963897B CN 107963897 B CN107963897 B CN 107963897B CN 201711246567 A CN201711246567 A CN 201711246567A CN 107963897 B CN107963897 B CN 107963897B
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黄旭东
蒋益
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Abstract

本发明涉及一种高强型轻质耐火材料的制备方法,属于耐火材料技术领域。本发明通过毛竹纤维制备纤维素凝胶液,与粘度较高的桃胶复合并制备复合凝胶液,由于将膨胀珍珠岩颗粒填充至凝胶材料中,在高温煅烧环境下,凝胶失水并形成固体,同时膨胀珍珠岩颗粒持续增强其体积,在凝胶颗粒中形成一个个均一的孔洞结构,再在高温环境下煅烧后凝胶炭化并部分高温分解,从而相互贯通形成连续的孔道结构,通过形成的连续的孔道结构,有效提高耐火材料的力学性能,同时有效降低材料的密度,达到轻质材料的标准。

Description

一种高强型轻质耐火材料的制备方法
技术领域
本发明涉及一种高强型轻质耐火材料的制备方法,属于耐火材料技术领域。
背景技术
耐火材料是制造炉衬与高温下使用的容器、部件不可或缺的基础材料。随着低碳经济时代的来临,作为炉衬的耐火材料对于工业炉的节能减排起着非常重要的作用。轻质耐火材料又被称为隔热耐火材料,具有体积密度小、导热系数低等特点。因此,轻质耐火材料多被用于工业窑炉的隔热层,达到节能减排目的。轻质耐火材料通常指总气孔率不低于45%的耐火材料制品。其具有气孔率高、体积密度小、热导率低等特点,也称为绝热耐火材料或隔热耐火材料。轻质耐火材料是由晶相、非晶相等固相和气相组合而成多相体,其中的固相大多数是非金属氧化物,材料气孔中气相的热导率比固相低,同时气固相之间传导热量时传导方式发生改变,使轻质耐火材料的热导率大大降低,具有了良好的隔热效果。
我国目前生产的轻质耐火材料主要为硅质、粘土质、高铝质和刚玉质。其中以高纯莫来石和刚玉质,包括氧化铝空心球,轻质耐火材料制品使用性能最为优良。但是在实际应用中,还是存在着许多不尽如人意的地方。现有的轻质耐火材料由于力学性能较差,不能满足现有材料对使用的需求,所以制备一种具有较高力学性能的耐火材料很有必要。
发明内容
本发明所要解决的技术问题:针对轻质耐火材料力学性能较差的问题,提供了一种高强型轻质耐火材料的制备方法。
为解决上述技术问题,本发明采用的技术方案是:
(1)取毛竹并将其置于刨片机中,打成刨花,洗涤干净,得毛竹刨花,收集毛竹刨花并研磨过筛,得竹刨花颗粒;
(2)按重量份数计,分别称量45~50份氢氧化钠溶液,10~15份竹刨花颗粒和3~5份尿素置于烧杯中,搅拌混合并冷冻处理,静置至室温并过滤,收集得过滤液;
(3)按重量份数计,分别称量45~50份过滤液、1~2份乙酸乙酯、0.5~1.0份乙酸和1.0~1.5份三氯甲烷置于三角烧瓶中,搅拌混合并静置固化,过滤 收集滤液得凝胶液;
(4)按质量比1:5,将桃胶粉末添加至凝胶液中,搅拌混后得混合液并重量份数计,分别称量45~50份混合液、10~15份膨胀珍珠岩和3~5份油页岩置于搅拌机中,搅拌混合得混合浆液;
(5)按重量份数计,分别称量45~50份混合浆液、10~15份去离子水、25~30份粉煤灰和3~5份硅酸盐水泥和6~8份高岭石置于搅拌机中,搅拌混合并浇注至模具中,压制成型并收集成型模具,将模具置于隧道窑中,烧制成型并静置冷却至室温,即可制备得一种高强型轻质耐火材料。
步骤(1)所述的刨花长度为20~30mm。
步骤(2)所述的冷冻处理温度为-15~-10℃。
步骤(5)所述的压制成型压强为2~3MPa。
步骤(5)所述的烧制成型温度为1250~1550℃。
本发明与其他方法相比,有益技术效果是:
(1)本发明通过毛竹纤维制备纤维素凝胶液,与粘度较高的桃胶复合并制备复合凝胶液,由于将膨胀珍珠岩颗粒填充至凝胶材料中,在高温煅烧环境下,凝胶失水并形成固体,同时膨胀珍珠岩颗粒持续增强其体积,在凝胶颗粒中形成一个个均一的孔洞结构,再在高温环境下煅烧后凝胶炭化并部分高温分解,从而相互贯通形成连续的孔道结构,通过形成的连续的孔道结构,有效提高耐火材料的力学性能,同时有效降低材料的密度,达到轻质材料的标准;
(2)本发明轻质耐火材料中添加了油页岩,油页岩经高温煅烧后发生分解并生成非晶石英相和莫来石相,从而产生体积膨胀,且烧成温度的升高导致二氧化硅增多,填充了材料总多余孔隙结构,加速了复合材料烧结的的速度,基质更加致密,内部孔隙趋于缩小并且分布更加均匀,降低材料显气孔率,提高了材料的力学性能。
具体实施方式
取毛竹并将其置于刨片机中,打成长度为20~30mm的刨花,用清水冲洗3~5次后再在干燥窑中干燥处理,干燥至含水量为5~8%得毛竹刨花,收集毛竹刨花并研磨过200目筛,得竹刨花颗粒并按重量份数计,分别称量45~50份质量分数10%氢氧化钠溶液,10~15份竹刨花颗粒和3~5份尿素置于烧杯中,搅拌混合并置于-15~-10℃下冷冻处理3~5h,静置至室温并过滤,收集得过滤液并按重量份数计,分别称量45~50份过滤液、1~2份乙酸乙酯、0.5~1.0份乙酸和1.0~1.5份三氯甲烷置于三角烧瓶中,搅拌混合并静置固化10~15min,过滤 收集滤液得凝胶液;按质量比1:5,将桃胶粉末添加至凝胶液中,搅拌混后得混合液并重量份数计,分别称量45~50份混合液、10~15份膨胀珍珠岩和3~5份油页岩置于搅拌机中,搅拌混合得混合浆液按重量份数计,分别称量45~50份混合浆液、10~15份去离子水、25~30份粉煤灰和3~5份硅酸盐水泥和6~8份高岭石置于搅拌机中,搅拌混合并浇注至模具中,将模具置于2~3MPa下压制成型并收集成型模具,将模具置于隧道窑中,再在1250~1550℃下烧制20~24h,静置冷却至室温,即可制备得一种高强型轻质耐火材料。
实例1
取毛竹并将其置于刨片机中,打成长度为20mm的刨花,用清水冲洗3次后再在干燥窑中干燥处理,干燥至含水量为5%得毛竹刨花,收集毛竹刨花并研磨过200目筛,得竹刨花颗粒并按重量份数计,分别称量45份质量分数10%氢氧化钠溶液,10份竹刨花颗粒和3份尿素置于烧杯中,搅拌混合并置于-15℃下冷冻处理3h,静置至室温并过滤,收集得过滤液并按重量份数计,分别称量45份过滤液、1份乙酸乙酯、0.5份乙酸和1.0份三氯甲烷置于三角烧瓶中,搅拌混合并静置固化10min,过滤 收集滤液得凝胶液;按质量比1:5,将桃胶粉末添加至凝胶液中,搅拌混后得混合液并重量份数计,分别称量45份混合液、10份膨胀珍珠岩和3份油页岩置于搅拌机中,搅拌混合得混合浆液按重量份数计,分别称量45份混合浆液、10份去离子水、25份粉煤灰和3份硅酸盐水泥和6份高岭石置于搅拌机中,搅拌混合并浇注至模具中,将模具置于2MPa下压制成型并收集成型模具,将模具置于隧道窑中,再在1250℃下烧制20h,静置冷却至室温,即可制备得一种高强型轻质耐火材料。
实例2
取毛竹并将其置于刨片机中,打成长度为20mm的刨花,用清水冲洗3次后再在干燥窑中干燥处理,干燥至含水量为5%得毛竹刨花,收集毛竹刨花并研磨过200目筛,得竹刨花颗粒并按重量份数计,分别称量45份质量分数10%氢氧化钠溶液,10份竹刨花颗粒和3份尿素置于烧杯中,搅拌混合并置于-15℃下冷冻处理3h,静置至室温并过滤,收集得过滤液并按重量份数计,分别称量45份过滤液、1份乙酸乙酯、0.5份乙酸和1.0份三氯甲烷置于三角烧瓶中,搅拌混合并静置固化12min,过滤 收集滤液得凝胶液;按质量比1:5,将桃胶粉末添加至凝胶液中,搅拌混后得混合液并重量份数计,分别称量45份混合液、10份膨胀珍珠岩和3份油页岩置于搅拌机中,搅拌混合得混合浆液按重量份数计,分别称量45份混合浆液、10份去离子水、25份粉煤灰和3份硅酸盐水泥和6份高岭石置于搅拌机中,搅拌混合并浇注至模具中,将模具置于2MPa下压制成型并收集成型模具,将模具置于隧道窑中,再在1250℃下烧制20h,静置冷却至室温,即可制备得一种高强型轻质耐火材料。
实例3
取毛竹并将其置于刨片机中,打成长度为25mm的刨花,用清水冲洗4次后再在干燥窑中干燥处理,干燥至含水量为7%得毛竹刨花,收集毛竹刨花并研磨过200目筛,得竹刨花颗粒并按重量份数计,分别称量47份质量分数10%氢氧化钠溶液,12份竹刨花颗粒和4份尿素置于烧杯中,搅拌混合并置于-12℃下冷冻处理4h,静置至室温并过滤,收集得过滤液并按重量份数计,分别称量47份过滤液、2份乙酸乙酯、0.7份乙酸和1.2份三氯甲烷置于三角烧瓶中,搅拌混合并静置固化12min,过滤 收集滤液得凝胶液;按质量比1:5,将桃胶粉末添加至凝胶液中,搅拌混后得混合液并重量份数计,分别称量47份混合液、12份膨胀珍珠岩和4份油页岩置于搅拌机中,搅拌混合得混合浆液按重量份数计,分别称量47份混合浆液、12份去离子水、27份粉煤灰和4份硅酸盐水泥和7份高岭石置于搅拌机中,搅拌混合并浇注至模具中,将模具置于2MPa下压制成型并收集成型模具,将模具置于隧道窑中,再在1450℃下烧制22h,静置冷却至室温,即可制备得一种高强型轻质耐火材料。
将本发明制备的轻质耐火材料进行性能测试,具体测试结果如下表表1所示:
表1 性能对照表
Figure 785100DEST_PATH_IMAGE001
由上表可知,本发明制备的耐火材料具有优异的力学性能。

Claims (1)

1.一种高强型轻质耐火材料的制备方法,其特征在于具体制备步骤为:
(1)取毛竹并将其置于刨片机中,打成刨花,洗涤干净,得毛竹刨花,收集毛竹刨花并研磨过筛,得竹刨花颗粒;所述的刨花长度为20~30mm;
(2)按重量份数计,分别称量45~50份氢氧化钠溶液,10~15份竹刨花颗粒和3~5份尿素置于烧杯中,搅拌混合并冷冻处理,静置至室温并过滤,收集得过滤液;所述的冷冻处理温度为-15~-10℃;
(3)按重量份数计,分别称量45~50份过滤液、1~2份乙酸乙酯、0.5~1.0份乙酸和1.0~1.5份三氯甲烷置于三角烧瓶中,搅拌混合并静置固化,过滤 收集滤液得凝胶液;
(4)按质量比1:5,将桃胶粉末添加至凝胶液中,搅拌混后得混合液并重量份数计,分别称量45~50份混合液、10~15份膨胀珍珠岩和3~5份油页岩置于搅拌机中,搅拌混合得混合浆液;
(5)按重量份数计,分别称量45~50份混合浆液、10~15份去离子水、25~30份粉煤灰和3~5份硅酸盐水泥和6~8份高岭石置于搅拌机中,搅拌混合并浇注至模具中,压制成型并收集成型模具,将模具置于隧道窑中,烧制成型并静置冷却至室温,即可制备得高强型轻质耐火材料;所述的压制成型压强为2~3MPa;所述的烧制成型温度为1250~1550℃。
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