北京科技大学学报2011，Vol.33Issue(10)：1260-1264,5.
硝酸钠对改善赤泥陶粒性能的影响
Effect of sodium nitrate on improvement in the properties of ceramsite using red mud
杨慧芬 1党春阁 2马雯 1景丽丽2
作者信息
- 1. 北京科技大学土木与环境工程学院,北京100083
- 2. 北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083
- 折叠
摘要
Abstract
Based on analyzing the chemical composition,mineral composition and thermal stability of red mud,the preparation of ceramsite was investigated with calcite itself in red mud or added sodium nitrate as a foaming agent.Main components of the obtained ceramsite were analyzed by X-ray diffraction（XRD） and the internal structure was observed by scanning electron microscopy（SEM）.The results show that with calcite itself as a foaming agent,the ceramsite with a bulk density of 1.43g·cm-3,a water absorption rate（WAR） of 1.23% and a cylinder compressive strength（CCS） of 22.14 MPa is prepared when the mass ratio of red mud/waste glass/bentonite is 74∶15∶11.However the bulk density is obviously decreased by adding sodium nitrate.The ceramsite with a bulk density of 1.28g·cm-3,a WAR of 1.54% and a CCS of 12.03 MPa is prepared when the mass ratio of red mud/waste glass/bentonite/sodium nitrate is 70.0∶14.2∶10.2∶5.6.Crystalline phases present in the obtained ceramsite are mainly gehlenite,different from calcite in red mud based on XRD data.SEM images indicate that the majority of pores in the obtained ceramsite are sealed,and when sodium nitrate is used as a foaming agent,the porosity is higher in comparison with calcite in red mud,and the internal pore size is more uniform.关键词
固体废物/废物利用/赤泥/方解石/硝酸钠/陶粒Key words
solid wastes/waste utilization/red mud/calcite/sodium nitrate/ceramsite分类
资源环境引用本文复制引用
杨慧芬,党春阁,马雯,景丽丽..硝酸钠对改善赤泥陶粒性能的影响[J].北京科技大学学报,2011,33(10):1260-1264,5.
