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| Effect of Modified Pitch-Coal Tar Mixed Binder with B4C on Properties of Ramming Paste for Aluminum Electrolysis |
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Received:May 22, 2017
Revised:May 24, 2017
Accepted:May 31, 2017
Published Online:September 18, 2017
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| DOI：doi：10.3969/j.issn.1007-7545.2017.10.008 |
| KeyWord:ramming paste; B4C addition; expansion/shrinkage process; mixed binder; boron oxide |
| Author | Institution |
| liuwei |
贵州师范大学材料与建筑工程学院 |
| YAO Zhen |
贵州师范大学 材料与建筑工程学院 |
| chenyi |
贵州师范大学 材料与建筑工程学院 |
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| Abstract: |
| Modified binder consists of modified pitch and coal tar mixed with boron carbide powders. Ramming paste was synthesized applying modified binder and calcined anthracite coal, coal derived pitch coke, baked scrap as aggregates. Effect of B4C addition on properties and microstructure of ramming paste were investigated. The results indicate that increasing addition of B4C, results in rises of ash, electrical resistivity, compressive strength and carbon yield, and drops of volatile matter and expansion/shrinkage. Obtained through high temperature chemical reaction between B4C and small molecular compounds such as O2, CO, B2O3 can reduce volume change and weight loss rate of ramming paste, and improve compact degree of binder coke. The optimal comprehensive properties of ramming paste are obtained with addition of B4C of 3%. |
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