CN108059453A - 一种干熄焦炉环风管道用镁铝尖晶石砖 - Google Patents

一种干熄焦炉环风管道用镁铝尖晶石砖 Download PDF

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CN108059453A
CN108059453A CN201610984729.6A CN201610984729A CN108059453A CN 108059453 A CN108059453 A CN 108059453A CN 201610984729 A CN201610984729 A CN 201610984729A CN 108059453 A CN108059453 A CN 108059453A
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pipe road
dry quenching
quenching furnace
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洪建国
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Shanghai Meishan Iron and Steel Co Ltd
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Abstract

本发明涉及一种干熄焦炉环风管道用镁铝尖晶石砖，解决现有干熄焦炉环风管道用镁铝尖晶石砖易开裂、抗侵蚀性能差、使用寿命低的技术问题。本发明的技术方案为：一种干熄焦炉环风管道用镁铝尖晶石砖，其原料组分的重量百分比为：电熔镁砂46％～55％、富镁铝尖晶石25％～35％、硅微粉7％～9％、氧化铝超细粉7％～9％，氧化锆2％～3％。本发明镁铝尖晶石砖的抗侵蚀性能、抗剥落性能有了大幅提升，采用本发明镁铝尖晶石砖砌筑成的干熄焦炉环风管道的使用寿命从现有的18月提高到5年以上。

Description

一种干熄焦炉环风管道用镁铝尖晶石砖
技术领域
本发明涉及一种镁铝尖晶石砖，特别涉及一种干熄焦炉环风管道用镁铝尖晶石砖，属于耐火材料领域。
背景技术
干法熄焦工艺由于其具有回收能源、节约水资源、保护环境、提高焦炭质量等优点，成为中国焦化行业准入标准中明确必须采用的工艺，但干熄焦本体内衬砌体由于所处环境恶劣，集中在环风管道用砖被侵蚀和斜道支柱砖(牛腿)的开裂掉损等影响砌体寿命问题。现有环风管道用砖用的镁铝尖晶石砖在急冷急热的环境下，使用不满18月就出现了开裂问题，需要频繁的对其进行更换修复，限制了干熄焦炉产能的正常发挥。
现有技术中，授权公告号为CN203432338U中国专利文件公开了一种碱性窑炉用镁铝尖晶石砖，包括砖体，所述砖体的上、下表面的几何形状均为矩形；所述砖体的左、右侧面分别设有凹槽和凸棱，砖体的前、后表面分别设有凹槽和凸棱；所述凹槽和凸棱均位于其各自所在表面的中间位置，并且所述凹槽和凸棱的形状以及尺寸大小相适配。本实用新型通过在砖体的两组相对应的表面分别设置凹槽或凸棱，使每块相邻砖体之间的凹槽和凸棱相适配，使得砖体与砖体之间连接更紧密；并且在使用过程中，经过高温烧制后，砖体之间更加具有整体性，从而可以有效避免砖体的掉落和蹿火现象的出现，本实用新型可用于窑内的不同段带，具有广泛的使用范围，本技术主要从砖的形状方面进行改进。申请公布号为CN104230351A的中国专利文件公开了一种RH炉用无铬镁铝尖晶石砖修补料，其主要由方镁石、烧结镁砂、六水氯化镁、促凝剂等物质组成，该材料为修补材料。
因此，提高环风管道用砖用的镁铝尖晶石砖的使用寿命是行业内迫切需要解决的问题。
发明内容
本发明的目的是提供一种干熄焦炉环风管道用镁铝尖晶石砖，解决现有干熄焦炉环风管道用镁铝尖晶石砖易开裂、抗侵蚀性能差、使用寿命低的技术问题。
本发明采用的技术方案是：一种干熄焦炉环风管道用镁铝尖晶石砖，其原料组分的重量百分比为：电熔镁砂46％～55％、富镁铝尖晶石25％～35％、硅微粉7％～9％、氧化铝超细粉7％～9％，氧化锆2％～3％。
本发明干熄焦炉环风管道用镁铝尖晶石砖的组分限定在上述范围内的理由如下：
电熔镁砂是镁的氧化物，主要由菱镁矿、水镁矿或从海水中提取的氢氧化镁经高温煅烧而成，其氧化镁活性度高。本发明选择碱性物质电熔镁砂的骨料，电熔镁砂中的氧化镁重量百分含量≥98％；经过多年研究试验，本发明限定电熔镁砂的含量为46％～55％。
本专利采用的电熔镁砂为高纯电熔镁砂，其熔点为2800℃，体积密度≥3.6g/cm3,显气孔率低≤3％，因此该镁铝尖晶石砖抗侵蚀性能好。
富镁铝镁尖晶石的热膨胀系数(约8.6×10-9/℃)比电熔镁砂的热膨胀系数(约13.8×10-9/℃)低，具有更好的热震稳定性能。本发明限定富镁铝尖晶石的含量为25％～35％；富镁铝尖晶石中的氧化镁重量百分含量≥42％。
为了增强材料抗渗透性，提高材料的致密度，同时为了不增加材料的含水量，本发明中选用硅微粉和氧化铝超细粉作为结合剂，有利于在使用温度下的热态强度，从而保证其耐冲刷性。硅微粉和氧化铝超细粉的作用还在于提高填充性，降低加水量、改善流动性和促进低、中温强度的发展，以防止镁铝尖晶石砖在高温下发生开裂，提高其抗剥落性能。在本技术方案中，氧化铝超细粉和氧化镁反应生成的原位活性尖晶石和加入的富镁铝镁尖晶石，能提高石灰石和石灰的抗渗透性。
本发明技术方案在现有镁铝尖晶石砖组分中通过创造性的添加了氧化锆，以期解决其开裂、抗侵蚀性能差的问题；添加氧化锆的机理是基于其在高温烧结时，氧化锆颗粒以四方相存在，烧结致密后冷却时，四方相氧化锆的相变膨胀受基体束缚，相变受到抑制，在室温下仍以四方相存在。当外力作用在耐材中形成裂纹时，在裂纹尖端应力场作用下，氧化锆粒子发生m-单斜→t-四方转变，吸收裂纹扩展的能量，从而提高了整体耐材的断裂韧性。进而增加材料的抗侵蚀性，其加入量不易过高，太高反而导致材料的不稳定性，太低起不到作用，经过多年研究试验，本发明限定氧化锆的含量为2％～3％。
本发明的配制和施工方法是：将电熔镁砂、富镁铝尖晶石、硅微粉、氧化铝超细粉、氧化锆按照本发明的配比进行搅拌，然后通过压力机压出不同的砖型，砖型根据干熄焦炉环风管道的图纸进行。施工按照现有的砖方法进行。
本发明相比现有技术具有如下积极效果：本发明镁铝尖晶石砖的抗侵蚀性能、抗剥落性能有了大幅提升；采用本发明镁铝尖晶石砖砌筑成的干熄焦炉环风管道的使用寿命从现有的18月提高到5年以上；降低了干熄焦炉维护成本和检修时间；进而降低干熄焦炉生产成本。
具体实施方式
一种干熄焦炉环风管道用镁铝尖晶石砖，其原料组分的重量百分比为：电熔镁砂46％～55％、富镁铝尖晶石25％～35％、硅微粉7％～9％、氧化铝超细粉7％～9％，氧化锆2％～3％。
本发明实施例镁铝尖晶石砖的组分见表1。
表1本发明实施例镁铝尖晶石砖的组分(按重量百分比计)
本发明的配制和施工方法是：将电熔镁砂、富镁铝尖晶石、硅微粉、氧化铝超细粉、氧化锆按照本发明的配比进行搅拌，然后通过压力机压出不同的砖型，砖型根据干熄焦炉环风管道的图纸进行。施工按照现有的砖方法进行。
本发明使得其抗侵蚀性能、抗剥落得到提高，体现在使用本发明使得干熄焦炉环风管道的使用寿命从原先的18月提高到5年以上。

Claims (3)

1.一种干熄焦炉环风管道用镁铝尖晶石砖，其原料组分的重量百分比为：电熔镁砂46％～55％、富镁铝尖晶石25％～35％、硅微粉7％～9％、氧化铝超细粉7％～9％，氧化锆2％～3％。
2.如权利要求1所述的一种干熄焦炉环风管道用镁铝尖晶石砖，其特征是，所述的电熔镁砂为高纯电熔镁砂，熔点为2800℃，体积密度≥3.6g/cm3，电熔镁砂中的氧化镁重量百分含量≥98％。
3.如权利要求1所述的一种干熄焦炉环风管道用镁铝尖晶石砖，其特征是，所述的富镁铝尖晶石中的氧化镁重量百分含量≥42％。
CN201610984729.6A 2016-11-09 2016-11-09 一种干熄焦炉环风管道用镁铝尖晶石砖 Pending CN108059453A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112250454A (zh) * 2020-10-30 2021-01-22 德清县钢友耐火材料有限公司 一种新型干熄焦用耐火材料
CN113929438A (zh) * 2021-10-22 2022-01-14 河南瑞泰耐火材料科技有限公司 一种水泥窑烧成带用耐火材料的制备方法

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