硅酸盐学报2007，Vol.35Issue(12)：1657-1660,4.
用煅烧-沥滤工艺从粉煤灰中提取高纯超细氧化铝
HIGH PURITY ALUMINA POWDERS EXTRACTED FROM FLY ASH BY THE CALCINING-LEACHING PROCESS
季惠明 1卢会湘 2郝晓光 1吴萍3
作者信息
- 1. 天津大学材料科学与工程学院,先进陶瓷与加工技术教育部重点实验室,天津,300072
- 2. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072
- 3. 洛阳大学环境与化学工程系,河南,洛阳,471003
- 折叠
摘要
Abstract
A new calcining-leaching process was used to extract high purity alumina (Al2O3) powders from fly ash in this study. The fly ash was mixed with soda (Na2CO3) and calcined at 900 ℃ to yield soluble aluminates. Subsequently the calcined ash was leached with sulfuric acid (H2SO4) to produce a solution containing aluminum. The unwanted metal ions including Fe3+ and Na+ were removed by ethylene diamine tetraacetic acid (EDTA) and water washing. Then added the proper dispersant, controlling the crystallization of aluminum trihydroxide precipitation, and the drying and calcining process was carried out, resulting in ultra fine Al2O3 powders with high purity. The characteristics of the Al2O3 powders were examined by means of X-ray diffraction, transmission electron microscope and the Brunauer, Emmet and Teller (BET) surface analysis method. The extraction efficiency of Al2O3 can surpass 98%by optimization of the calcination and lixiviation processes. Well-dispersed fibriform γ-Al2O3 powders were obtained by calcining at 800 ℃ and the purity of the ultra fine Al2O3 powders was more than 99.6%.关键词
粉煤灰/氧化铝/提取/煅烧-沥滤工艺Key words
fly ash/ alumina/ extraction/ calcining-leaching process分类
化学化工引用本文复制引用
季惠明,卢会湘,郝晓光,吴萍..用煅烧-沥滤工艺从粉煤灰中提取高纯超细氧化铝[J].硅酸盐学报,2007,35(12):1657-1660,4.
