化工进展2019，Vol.38Issue(3)：1468-1475,8.DOI:10.16085/j.issn.1000-6613.2018-1031
稀土电解槽石墨内衬高温氧化过程中孔隙结构演化规律及其分形特征
Evolution of pore structure and fractal characteristics of graphite lining in rare earth electrolytic cell during high temperature oxidation
摘要
Abstract
In view of the breakage of graphite lining in rare earth electrolytic cell, micro-CT was used to study the evolution characteristics of internal micro-pore structure of rare-earth electrolytic cell graphite lining under different oxidation time. The variation rules of the porosity, pore throat size, pore throat shape factor, pore fractal dimension and other parameters were investigated. The result showed that the average porosity of the graphite lining was gradually increased after 0, 1 h, 2 h and 3 h of oxidation time, and the porosity were 4.02％, 8.53％, 11.18％, and 13.35％, respectively. The number of pore throats with size between 5-25μm and shape factor between 0.02-0.05 increased from 17903 to 39388. Therefore, fractal dimension can be used indirectly to judge the degree of oxidation corrosion of graphite lining.Finally, a fractal expression of the permeability of the graphite liner was established. The theoretical permeability of the graphite liner under the oxidation time of 0, 1 h, 2 h, and 3 h was calculated to be0.10μm2, 0.25μm2, 0.37μm2, and 0.52μm2, respectively. The calculated result were similar to the actual permeability which were 0.09μm2, 0.18μm2, 0.38μm2 and 0.57μm2, therefore, it can be used to predict the permeability of graphite lining.关键词
石墨内衬/渗透率/多孔介质/氧化/孔隙演化/分形Key words
graphite lining/permeability/porous media/oxidation/pore evolution/fractal分类
矿业与冶金引用本文复制引用
刘庆生,段旭,谈成亮..稀土电解槽石墨内衬高温氧化过程中孔隙结构演化规律及其分形特征[J].化工进展,2019,38(3):1468-1475,8.基金项目
国家自然科学基金(51564019) （51564019）
