炼铁高炉用碳化硅风口组合大砖的制备与性能  

Preparation and properties of SiC assembled large block for blast furnace tuyere

作　　者：吕春江[1] 常赪[1] 黄一飞 曹会彦[1] 李杰[1] 朱冲[1] Lyu Chunjiang;Chang Cheng;Huang Yifei;Cao Huiyan;Li Jie;Zhu Chong(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China;不详)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2023年第2期139-144,共6页Refractories

摘　　要：以碳化硅颗粒(3~1、1~0.088 mm)与细粉(<0.088 mm)、硅粉(<0.088 mm)、工业炭黑(牌号N990)、二氧化硅微粉和ρ-Al_(2)O_(3)粉等为原料制备了炼铁高炉用碳化硅风口组合大砖,并与氮化硅结合碳化硅砖、自结合碳化硅砖、国外进口自结合碳化硅砖对比,分析与评估新型碳化硅风口组合大砖的使用性能。结果表明:1)0~100 mm区域主要由O’-SiAlON、β-SiAlON、α-Si_(3)N_(4)、Si_(2)N_(2)O等一种或多种氮化物与β-SiC复相结合而成,体积密度2.68~2.70 g·cm^(-3),显气孔率14%~15%,组织结构均匀。2)0~100 mm区域β-SiC纳米晶须与氮化物有穿插生长现象;随着深度增加,絮状β-SiC纳米晶须增多,氮化物减少,深度150 mm后结合相主要为β-SiC和莫来石。3)与参比制品比较,新型碳化硅风口组合大砖具有良好的基础性能指标,熔碱侵蚀后质量变化率-0.1%,明显优于进口自结合碳化硅和国产氮化硅结合碳化硅材料。SiC assembled large blocks for blast furnace tuyere were prepared using silicon carbide particles(3-1 and 1-0.088 mm) and fine powder(0.088 mm),silicon powder(0.088 mm),industrial carbon black(N990),microsilica,and ρ-Al_(2)O_(3),etc.as raw materials.The new blocks were compared with silicon nitride bonded silicon carbide brick,self-bonded silicon carbide brick and imported self-bonded silicon carbide brick to analyze and evaluate their service performance.The results show that:(1)in the 0-100 mm zone,the new SiC large block manly consists of composites of β-SiC and one or more nitrides such as O'-SiAlON,β-SiAlON,α-Si_(3)N_(4),and Si_(2)N_2O,the bulk density is 2.68-2.70 g·cm^(-3),the apparent porosity is 14%-15%,and the material structure is uniform;(2)in the 0-100 mm zone,β-SiC nano-whiskers intercalate with nitrides;with the depth increasing,the flocculent β-SiC nano-whiskers increase,while the nitrides decrease;when the depth reaches 150 mm or more,the main bonding phases are β-SiC and mullite;(3)compared with the reference products,the new SiC block has a good basic performance,and after alkali corrosion,the mass change rate is-0.1%,which is obviously superior to the imported self-bonded silicon carbide and the homemade silicon nitride bonded silicon carbide materials.

关 键 词：炼铁高炉 风口 碳化硅 抗碱侵蚀性能 

分 类 号：TQ175[化学工程—硅酸盐工业]