从热力学计算分析H_2气氛下Cr_2O_3的烧结机理  

Analysis the Sintering Mechanism of Cr_2O_3 at Hydrogen Atmosphere from Thermodynamic Calculation

作　　者：钱跃进[1,2] 蒋明学[1] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]洛阳理工学院材料科学与工程系,洛阳471023

出　　处：《武汉理工大学学报》2009年第20期47-49,共3页Journal of Wuhan University of Technology

摘　　要：通过对H2还原Cr2O3进行热力学计算分析,结果表明:H2可还原Cr2O3但难以持续;当系统中有过量C存在时,还原反应产生的H2O被C还原为H2和CO,使H2可持续还原Cr2O3。还原反应产生的新生金属相Cr在消除Cr2O3表面不平衡的O2-时使2个Cr2O3颗粒通过离子键结合,从而促进Cr2O3的烧结,通过理论分析认为这是纯Cr2O3和高铬耐火材料烧结的根本原因。同时,通过热力学计算分析,表明在煤气化炉中使用高铬耐火材料是安全的。Through thermodynamic calculation for the reaction of H2 and Cr2O3, the Cr2O3 could be reduced continuance by H2 but don＇ t last out. The vapor produced by deoxidization reaction could be reduced by carbon in the system, then produce CAD and H2, which make H2 reducing Cr2O3 last long time. The new phase of Cr metal can make the imbalance surface structure of materials vanished by combine two Cr2O3 grain through electrovalent bond, which make the Cr2O3 sintered well, that would be the true reason of pure chromium oxide sintering well. At the same time, it is safe that the Cr2O3 refractory use in coal gasification by thermodynamic calculation .

关 键 词：还原反应 热力学计算 氧化铬 氢气 烧结机理 

分 类 号：TQ175.65[化学工程—硅酸盐工业]