中南大学学报（自然科学版）2012，Vol.43Issue(6)：2029-2035,7.
铝电解 TiB2/C 复合阴极用煤沥青的无机改性
Effect of inorganic particles on properties of modified pitches and pitch based TiB2/C composite cathodes for aluminium electrolysis
摘要
Abstract
The effects of inorganic particles on microstructure and properties of modified pitches and properties of pitch based TiB2/C composite cathodes were investigated. Pitches were modified by adding 10% A12O3 particles or 10% TiB2 particles at 200 ℃, respectively. The results show that both coking value and softening point of modified pitches increase compared to those of the untreated pitch. However, the addition of inorganic particles leads to a higher coking value but a lower softening points of modified pitches. Compared to the direct treated pitch, softening points of A12O3 particles and TiB2 particles based modified pitch decrease by 4.5 ℃ and 2.0 ℃ while the coking values increase by 4.85% and 5.35%, respectively. Moreover, after carbonized at 1 000 ℃, the carbon yields increase by 3.01 % and 5.87 %, respectively. Besides, properties of inorganic particle modified pitch based cathodes are more greatly improved than that of direct treated pitch based cathode. The bulk density increases by 0.45% and 1.79% and open porosity decreases by 5.08% and 5.78%. Electrical resistivity of their cathodes reduces from 52.93 uflm to 48.86 uf2m and 49.95 uOm and the compressive strength increases from 24.21 MPa to 28.78 MPa and 28.06 MPa while modified by A12O3 particles and TiB2 particles, respectively. What is more, the electrolysis expansion is reduced by 0.10 % and 0.16 %, respectively. Inorganic particles distribute evenly in the binder carbon.关键词
铝电解/TiB2/C复合阴极/无机粒子/改性沥青/Al2O3/TiB2Key words
aluminum electrolysis/TiB2/C composite cathode/inorganic particles/modified pitch/A12O3/TiB2分类
矿业与冶金引用本文复制引用
赖延清,胥建,吕晓军,李劼..铝电解 TiB2/C 复合阴极用煤沥青的无机改性[J].中南大学学报（自然科学版）,2012,43(6):2029-2035,7.基金项目
国家重点基础研究发展规划("973"计划)项目(2005CB623703) （"973"计划）
国家高技术研究发展计划("863"计划)项目(2008AA030502) （"863"计划）
国家科技支撑计划项目 (2009BAE85B02) （2009BAE85B02）
