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CN111018550A - 一种用于高温炉的密封保温填充料 - Google Patents

一种用于高温炉的密封保温填充料 Download PDF

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CN111018550A
CN111018550A CN201911414934.9A CN201911414934A CN111018550A CN 111018550 A CN111018550 A CN 111018550A CN 201911414934 A CN201911414934 A CN 201911414934A CN 111018550 A CN111018550 A CN 111018550A
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邓勇跃
景夫生
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Jiangsu Runmei New Material Co Ltd
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Abstract

本发明公开了一种用于高温炉的密封保温填充料，利用膨胀珍珠岩、膨胀蛭石的中温膨胀特性，以及高温下形成了莫来石反应和CaO与Fe2O3、MgO与Fe2O3的反应机理，获得较为致密的强度适中的填充料，该填充料的体积密度、耐压强度为1.4g/cm3以下、30MPa以上，开口气孔率为5％以下。组分中的粘土、超细粉等保证了密封保温填充料的可施工能，密封保温填料中添加的红柱石、石英、MgO、Fe2O3、CaO等组分在高温的反应特性保证了填料的高温反应及膨胀性能，封堵了大部分的开口气孔和孔隙，开口气孔率下降至5％以内。从而减少了30％以上的烟气的泄露和10％以上炉盖热量的损失，大大改善了高温石墨化炉窑顶部区域的工作环境。

Description

一种用于高温炉的密封保温填充料
技术领域
本发明涉及一种用于高温炉的密封保温填充料，具体为一种可改善高温石墨化炉窑顶部区域的工作环境，同时减少炉顶热量损失的保温填充料。
背景技术
目前高温石墨化炉窑顶部密封时，一般采用耐火浇注料浇注或者耐火砖进行砌筑然后使用填充土进行封堵。但是烟气和炉顶部热量仍然会通过材料的缝隙散发到工作区域，从而使工作环境温度升高和空气污染，对该区域的工作人员造成伤害。
发明内容
本发明要解决的技术问题是克服现有技术中高温石墨化炉窑顶部密封后仍有烟气和热量通过缝隙散发出来的缺陷，提供一种用于高温炉的密封保温填充料。
为了解决上述技术问题，本发明提供了如下的技术方案：
一种用于高温炉的密封保温填充料，包括以下重量份数的各组分：
硅石2～20份、
氧化铁0～10份、
镁砂5-20份
镁白云石0～20份
粘土2-13份、
粒度小于5μm超细粉3-12份、
石英0-8份
红柱石0-10份
膨胀珍珠岩5-25份
膨胀蛭石5-20份
高铝水泥0-10份六偏磷酸钠0～2份。
各组分优选的重量份数为：
硅石5～20份、
氧化铁5～10份、
镁砂12-20份
镁白云石3～10份
粘土3-10份、
粒度小于5μm超细粉3-10份、
石英0-5份
红柱石5-10份
膨胀珍珠岩10-25份
膨胀蛭石10-20份
高铝水泥3-7份
六偏磷酸钠0.2～0.5份。
更优选的，具体的重量份数为：
硅石10份、
氧化铁5份、
镁砂20份
镁白云石3份
粘土3份、
1μm超细粉10份、
石英5份
红柱石5份
膨胀珍珠岩20份
膨胀蛭石10份
高铝水泥7份
六偏磷酸钠0.2份。
更优选的，具体的重量份数为：
硅石5份、
氧化铁10份、
镁砂12份
镁白云石20份
粘土6份、
2μm超细粉3份、
红柱石10份
膨胀珍珠岩14份
膨胀蛭石15份
高铝水泥15份
六偏磷酸钠0.5份。
更优选的，具体的重量份数为：
硅石20份、
氧化铁8份、
镁砂15份
镁白云石12份
粘土10份、
5μm超细粉5份、
红柱石5份
膨胀珍珠岩10份
膨胀蛭石12份
高铝水泥3份
六偏磷酸钠0.3份。
进一步的，硅石的粒径＜3mm，氧化铁、镁砂和镁白云石的粒径＜2mm。
本发明的(半)干式密封填充料的中高温膨胀性能：控制密封填料的较高膨胀性的同时可以封堵炉盖和炉顶烟道的缝隙。在配方组成中添加石英、红柱石、膨胀珍珠岩、膨胀蛭石等材料，在中温环境下，利用材料固有的膨胀性能，而在高温下则利用其反应特性而获得膨胀性能。
(半)干式密封填充料的易维修性能：六偏磷酸钠、高铝水泥可保证密封填料在高温和低温时的合适强度。
本发明的密封填充料的中温膨胀机理如下：
蛭石是灼烧时能急剧膨胀层解的一组类云母矿物，蛭石在150～300℃温度区间内的膨胀，是由于和不同的阳离子结合的层间水的脱除引起的。在600℃以后的膨胀减弱。此时，温度达到800-100时，组分中的珍珠岩中的SiO2、Al2O3在有Na2O的条件下在一定温度环境中形成玻璃态物质，珍珠岩中水分汽化，在软化的含有玻璃质的珍珠岩内部膨胀，然后将填料中的孔隙封堵住。
本发明的密封填充料的高温反应机理：
当温度大于573℃时α-石英转变为β-石英，体积发生膨胀，温度继续升高至870℃以上时，β-石英转化成β-鳞石英体积继续增加，填料中的孔隙进一步减少；当温度高于1350℃时，填料中的Al2O3与SiO2开始反应生成莫来石，填料发生膨胀的体积增加。材料中的CaO在650～850℃先与组分Fe2O3生成铁酸钙，即CaO+Fe2O3＝CaFe2O4。随后是CaO与SiO2反应生成2CaO·SiO2，超过1000℃生成铁酸二钙：CaFe2O4+CaO＝Ca2Fe2O2。在更高的温度(1600℃以上)时生成熔点更高的产物，在整个过程中产生大量的液相将填充料中的孔隙填充。而填充料是持续膨胀的，因此大部分的开口气孔被其反应产物填充，堵塞了空气的通道，从而达到密封和绝热的要求。
因此，本发明的密封保温填充料干式或半干式施工用于高温炉窑、炉盖或烟道的密封保温填充料时，既具有简单的施工性能，同时具备中高温膨胀性能、抗烟气侵蚀性能和易维修性能。
本发明所达到的有益效果是：本发明摒弃了传统的高温石墨化炉采用一般耐火浇注料浇注或者耐火砖砌筑再用泥土封堵的方式，创造了一种用于高温石墨化炉炉盖和炉顶烟道密封保温的(半)干式填充料：利用膨胀珍珠岩、膨胀蛭石的中温膨胀特性，以及高温下形成了莫来石反应和CaO与Fe2O3、MgO与Fe2O3的反应机理，获得较为致密的强度适中的填充料，该填充料的体积密度、耐压强度可分别由最初的1.8g/cm3、5-10MPa经反应分别变化到1.4g/cm3以下、30MPa以上，开口气孔率可由30％下降至5％以下。组分中的粘土、超细粉等保证了密封保温填充料的可施工能，密封保温填料中添加的红柱石、石英、MgO、Fe2O3、CaO等组分在高温的反应特性保证了填料的高温反应及膨胀性能，封堵了大部分的开口气孔和孔隙，开口气孔率下降至5％以内。从而减少了30％以上的烟气的泄露和10％以上炉盖热量的损失，大大改善了高温石墨化炉窑顶部区域的工作环境。
具体实施方式
以下对本发明的优选实施例进行说明，应当理解，此处所描述的优选实施例仅用于说明和解释本发明，并不用于限定本发明。
实施例1
一种用于高温炉的密封保温填充料，包括以下重量份数的各组分：
硅石10份、
氧化铁5份、
镁砂20份
镁白云石3份
粘土3份、
1μm超细粉10份、
石英5份
红柱石5份
膨胀珍珠岩20份
膨胀蛭石10份
高铝水泥7份
六偏磷酸钠0.2份。
将上述物料按照比例称量好，放入强制搅拌机中搅拌3-5分钟后，即为(半)干式密封保温填充料。
实施例2
一种用于高温炉的密封保温填充料，包括以下重量份数的各组分：
硅石5份、
氧化铁10份、
镁砂12份
镁白云石20份
粘土6份、
2μm超细粉3份、
红柱石10份
膨胀珍珠岩14份
膨胀蛭石15份
高铝水泥15份
六偏磷酸钠0.5份。
将上述物料按照比例称量好，放入强制搅拌机中搅拌3-5分钟后，即为(半)干式密封保温填充料。
实施例3
一种用于高温炉的密封保温填充料，包括以下重量份数的各组分：
硅石20份、
氧化铁8份、
镁砂15份
镁白云石12份
粘土10份、
5μm超细粉5份、
红柱石5份
膨胀珍珠岩10份
膨胀蛭石12份
高铝水泥3份
六偏磷酸钠0.3份。
将上述物料按照比例称量好，放入强制搅拌机中搅拌3-5分钟后，即为(半)干式密封保温填充料。
最后应说明的是：以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (7)

1.一种用于高温炉的密封保温填充料，其特征在于，包括以下重量份数的各组分：
硅石2～20份、
氧化铁0～10份、
镁砂5-20份
镁白云石0～20份
粘土2-13份、
粒度小于5μm超细粉3-12份、
石英0-8份
红柱石0-10份
膨胀珍珠岩5-25份
膨胀蛭石5-20份
高铝水泥0-10份
六偏磷酸钠0～2份。
2.如权利要求1所述的用于高温炉的密封保温填充料，其特征在于，包括以下重量份数的各组分：
硅石5～20份、
氧化铁5～10份、
镁砂12-20份
镁白云石3～10份
粘土3-10份、
粒度小于5μm超细粉3-10份、
石英0-5份
红柱石5-10份
膨胀珍珠岩10-25份
膨胀蛭石10-20份
高铝水泥3-7份
六偏磷酸钠0.2～0.5份。
3.如权利要求2所述的用于高温炉的密封保温填充料，其特征在于，包括以下重量份数的各组分：
硅石10份、
氧化铁5份、
镁砂20份
镁白云石3份
粘土3份、
1μm超细粉10份、
石英5份
红柱石5份
膨胀珍珠岩20份
膨胀蛭石10份
高铝水泥7份
六偏磷酸钠0.2份。
4.如权利要求1所述的用于高温炉的密封保温填充料，其特征在于，包括以下重量份数的各组分：
硅石5份、
氧化铁10份、
镁砂12份
镁白云石20份
粘土6份、
2μm超细粉3份、
红柱石10份
膨胀珍珠岩14份
膨胀蛭石15份
高铝水泥15份
六偏磷酸钠0.5份。
5.如权利要求1所述的用于高温炉的密封保温填充料，其特征在于，包括以下重量份数的各组分：
硅石20份、
氧化铁8份、
镁砂15份
镁白云石12份
粘土10份、
5μm超细粉5份、
红柱石5份
膨胀珍珠岩10份
膨胀蛭石12份
高铝水泥3份
六偏磷酸钠0.3份。
6.如权利要求1-5任一项所述的用于高温炉的密封保温填充料，其特征在于，硅石的粒径＜3mm，氧化铁、镁砂和镁白云石的粒径均＜2mm。
7.如权利要求1-5任一项所述的用于高温炉的密封保温填充料的用途，其特征在于，干式或半干式施工用于高温炉窑、炉盖或烟道的密封保温填充料。
CN201911414934.9A 2019-12-31 2019-12-31 一种用于高温炉的密封保温填充料 Pending CN111018550A (zh)

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