CN112939583B - 一种铝矾土尾矿制备的rto蜂窝陶瓷蓄热体及其制备方法 - Google Patents
一种铝矾土尾矿制备的rto蜂窝陶瓷蓄热体及其制备方法 Download PDFInfo
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Abstract
本发明提供了一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,其中RTO蜂窝陶瓷蓄热体包括基料、添加剂和水,其中基料按重量份计,由以下重量份的组分制成:30‑65份铝矾土尾矿、10‑50份铬铁矿、15‑35助熔剂;添加剂包括粘结剂、润滑剂、塑化剂,粘结剂为基料质量的2‑5%,润滑剂为基料的3‑5%,塑化剂为基料的3‑5%,水的用量为基料的20‑24%。本发明实现了铝矾土尾矿高值化利用,减少了铝矾土尾矿带来的侵占土地、污染环境、破坏生态等问题,变废为宝,具有重大的经济效益和社会效益,服务生态文明建设。
Description
技术领域
本发明涉及陶瓷材料制备技术领域,尤其是涉及一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体及其制备方法。
背景技术
蜂窝陶瓷因比表面积大、蓄热能力高、抗热冲击性能好、压降小、热阻小、导热性能好、适应性强等等优点,用作RTO蜂窝陶瓷蓄热体,被广泛的用于汽车、化工、石油、印刷、医药、涂料、电力等行业的挥发性有机废气(VOCs)蓄热燃烧处理。
目前,常见的RTO装置中蜂窝陶瓷蓄热体常见的材质有莫来石质、堇青石质、钛酸铝质、刚玉质、石英质、碳化硅质的一种或多种材质的复合。虽然目前蜂窝陶瓷蓄热体的材质种类繁多,但存在原料价格昂贵、烧成温度高导致成本高的缺点。如中国发明专利申请号为201611218000.4,使用碳化硅、莫来石、高岭土等,为主要原材料,在1300-1400℃温度下烧成,焙烧时间为36-38小时,得到蜂窝陶瓷蓄热体,中国发明专利申请号为201410704755.X,使用稀土尾砂、铝矾土、莫来石为主要原材料,在1350-1400℃温度下烧成,保温2-3小时,获得蜂窝陶瓷蓄热体。
目前每年均会产生大量的铝矾土尾矿,带来了环境污染、土地占用和安全堆存等系列问题,而且造成了资源浪费,因此对铝矾土尾矿的再生利用,将产生巨大的环境效益和经济效益。
发明内容
为此,本发明的目的之一是,提供利用铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,在充分利用铝矾土尾矿等工业固废的同时,降低蜂窝陶瓷蓄热体的生产成本,从而促进铝矾土尾矿等工业固废的高值利用、以及蜂窝陶瓷蓄热体技术的应用和发展。本发明的另一目的在于提供一种利用铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备工艺。
本发明是通过以下技术方案实现的。
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,所述RTO蜂窝陶瓷蓄热体包括基料、添加剂和水,
其中基料按重量份计,由以下重量份的组分制成:30-65份铝矾土尾矿、10-50份铬铁矿、15-35助熔剂;
所述添加剂包括粘结剂、润滑剂、塑化剂,所述粘结剂为基料质量的2-5%,所述润滑剂为基料的3-5%,所述塑化剂为基料的3-5%,所述水的用量为基料的20-24%。
具体地,所述基料中各成分的粒度为220目筛以下。
具体地,所述助熔剂为锂瓷石、透灰石、硅灰石中的一种或几种。
具体地,所述粘结剂为羟丙基甲基纤维素、乙基纤维素、羧甲基纤维素、聚乙烯醇中的一种或几种按任意比例的混合物。
具体地,所述润滑剂为豆油、桐油、白色矿物油、黄色矿物油中的一种或几种按任意比例的混合物。
具体地,所述塑化剂为甘油。
具体地,所述铝矾土尾矿主要包括35-60%的Al2O3,30.00-38.16%的SiO2,4.00-15.18%的Fe2O3,1.00-2.00%的TiO2,0.50-1.00%的CaO。
本发明还提供一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)将基料和粘结剂干法混合后,制得具有紧密堆积的均匀混合物;
(2)然后将步骤(1)制得的均匀混合物置于捏合机中加入水进行捏合6-8分钟,加入润滑剂和塑化剂捏合8-12分钟,制得泥料;
(3)将步骤(2)制得的泥料制成泥段;
(4)将步骤(3)制得的泥段,挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥,得到坯体;
(5)将步骤(4)中干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结,得到RTO蜂窝陶瓷蓄热体。
由以上的技术方案可知,本发明的有益效果是:
1)使用铝矾土尾矿作为原材料大大降低了蜂窝陶瓷蓄热体的生产成本;
2)实现了铝矾土尾矿高值化利用,减少了铝矾土尾矿带来的侵占土地、污染环境、破坏生态等问题,变废为宝,具有重大的经济效益和社会效益,服务生态文明建设;
3)铝矾土尾矿中的铁钛含量较高,促进高温熔体的形成,降低了蜂窝陶瓷蓄热体的烧结温度,有利于节能减排,降低生产成本;
4)本发明制备的蜂窝陶瓷蓄热体密度为2.46g/cm3,甚至2.89g/cm3,强度高,轴向抗压强度达到45MPa,甚至52MPa,CTE为7.25-7.82×10-6/℃,可满足各种RTO蓄热式装置中蓄热材料的性能要求。
附图说明
图1为220目筛下铝矾土尾矿SEM 500倍显微照片。
图2为本发明制得的蜂窝陶瓷蓄热体SEM 500倍显微照片。
具体实施方式
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明,但不以任何形式限制本发明。应当指出的是,对本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进。这些都属于本发明的保护范围。
实施例1
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合65份的铝矾土尾矿粉,10份的铬铁矿,25份锂瓷石,2%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为铝矾土尾矿粉、铬铁矿、锂瓷石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量22%的水进行捏合7分钟,加入基料质量3%的豆油和基料质量4%的甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1170-1120℃的高温中进行烧结。
实施例2
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合55份的铝矾土尾矿粉,15份的铬铁矿,25份锂瓷石,3%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为铝矾土尾矿粉、铬铁矿、锂瓷石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入3份的豆油和3%甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结。
实施例3
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合55份的铝矾土尾矿粉,10份的铬铁矿,35份透辉石,3%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为铝矾土尾矿粉、铬铁矿、透辉石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入基料质量3%的黄色矿物油和基料质量4%的甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结。
实施例4
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合45份的铝矾土尾矿粉,25份的铬铁矿,30份锂瓷石,4%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为铝矾土尾矿粉、铬铁矿、锂瓷石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入基料质量4%的桐油和基料质量4%的甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结。
实施例5
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合35份的铝矾土尾矿粉,30份的铬铁矿,35份锂瓷石,2%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为铝矾土尾矿粉、铬铁矿、锂瓷石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入基料质量3%的豆油和基料质量4%的甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结。
对比例1
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合65份的特级铝矾土尾,35份锂瓷石,2%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为特级铝矾土尾、锂瓷石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入基料质量3%的豆油和基料质量4%的甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结。
对比例2
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合45份的特级铝矾土尾,30份的氧化铝粉,25份的锂瓷石,2%基料质量的甲基纤维素,制得具有紧密堆积的均匀混合物,其中基料为特级铝矾土尾、氧化铝粉、锂瓷石;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入基料质量3%的豆油和基料质量4%的甘油捏合10分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结。
对比例3
一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,包括以下操作步骤:
(1)按重量份计,采用干法混合17份的石英石、18份的莫来石、12份的堇青石、10份的高岭土、15份的钾长石、3份的氮化硅、4份的氮化硼、3份的氧化铝,并添加基料质量2%的甲基纤维素、基料质量1%的氰乙基纤维素、基料质量1%的羟乙基纤维素、基料质量1%的聚乙烯醇、基料质量1%的聚氧化乙烯、基料质量2%的丁二醇制得具有紧密堆积的均匀混合物,其中基料为石英石、莫来石、堇青石、高岭土、钾长石、氮化硅、氮化硼、氧化铝;(2)将混合完毕的均匀混合物置于捏合机器中加入基料质量21%的水进行捏合7分钟,加入基料质量3%的桐油和基料质量4%的甘油捏合30分钟;(3)练制步骤(2)中捏合的泥料成泥段;(4)将具有塑性的泥段挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥;(5)干燥后的坯体切割成固定高度后在1550-1600℃的高温中进行烧结。
分别对上述实施例和对比例制得的RTO蜂窝陶瓷蓄热体进行性能测试,性能测试结果如表1所示:
为了对实施例和对比例制得的RTO蜂窝陶瓷蓄热体的轴向抗压强度作对比,这里制备了150mm×150mm×150mm,单边20孔的蜂窝陶瓷,当然材料的规格不仅仅局限于此。
本专利列举了部分实施例说明本发明,并不构成对本发明的限制,可以进行许多修改。
从实施例1-5和比较例1-3可以看出,在CTE、轴向抗压强度、体积密度等性能方面没有大的差距,烧使用铝矾尾矿制备蜂窝陶瓷蓄热体,烧结温度降低了300-400℃,铝矾土尾矿中的铁钛含量较高,促进高温熔体的形成,降低了蜂窝陶瓷蓄热体的烧结温度,有利于节能减排,降低生产成本。另外,铝矾土尾矿价格远远低于其它陶瓷原材料的价格,大大减少了蜂窝陶瓷蓄热体的生产成本。
以上所述,仅是本申请的几个实施例,并非对本申请做任何形式的限制,虽然本申请以较佳实施例揭示如上,然而并非用以限制本申请,任何熟悉本专业的技术人员,在不脱离本申请技术方案的范围内,利用上述揭示的技术内容做出些许的变动或修饰均等同于等效实施案例,均属于技术方案范围内。
Claims (5)
1.一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,其特征在于,所述RTO蜂窝陶瓷蓄热体由基料、添加剂和水制成,
其中基料按重量份计,由以下重量份的组分制成:30-65份铝矾土尾矿、10-50份铬铁矿、15-35助熔剂;
所述添加剂为粘结剂、润滑剂、塑化剂,所述粘结剂为基料质量的2-5%,所述润滑剂为基料的3-5%,所述塑化剂为基料的3-5%,所述水的用量为基料的20-24%;所述铝矾土尾矿由35-60%的Al2O3,30.00-38.16%的SiO2,4.00-15.18%的Fe2O3,1.00-2.00%的TiO2,0.50-1.00%的CaO组成,铝矾土尾矿所有成分加和为100%;
所述助熔剂为锂瓷石、透辉石中的一种或两种。
2.根据权利要求1所述的一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,其特征在于,所述基料中各成分的粒度为220目筛以下。
3.根据权利要求1所述的一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,其特征在于,所述润滑剂为豆油、桐油、白色矿物油、黄色矿物油中的一种或几种按任意比例的混合物。
4.根据权利要求1所述的一种铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体,其特征在于,所述塑化剂为甘油。
5.一种如权利要求1所述的铝矾土尾矿制备的RTO蜂窝陶瓷蓄热体的制备方法,其特征在于,包括以下操作步骤:
(1)将基料和粘结剂干法混合后,制得具有紧密堆积的均匀混合物;
(2)然后将步骤(1)制得的均匀混合物置于捏合机中加入水进行捏合6-8分钟,加入润滑剂和塑化剂捏合8-12分钟,制得泥料;
(3)将步骤(2)制得的泥料制成泥段;
(4)将步骤(3)制得的泥段,挤出成蜂窝状结构,带外皮挤出,然后进行微波干燥,得到坯体;
(5)将步骤(4)中干燥后的坯体切割成固定高度后在1070-1120℃的高温中进行烧结,得到RTO蜂窝陶瓷蓄热体。
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