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| 硝酸脱除褐煤粉煤灰中的砷 | |
| 引用本文： | 韩大捷,马淑花,王晓辉,丁健,郑诗礼,罗扬,郭奋.硝酸脱除褐煤粉煤灰中的砷[J].过程工程学报,2018,18(4):716-721. |
| 作者姓名： | 韩大捷 马淑花 王晓辉 丁健 郑诗礼 罗扬 郭奋 |
| 作者单位： | 1. 北京化工大学化学工程学院，北京 100029 2. 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室，北京 100190 |
| 摘 要： | 基于砷在褐煤粉煤灰中的赋存状态，建立了酸法脱除粉煤灰中部分砷的新方法，考察了反应温度、时间、pH值等对脱砷率的影响. 结果表明，褐煤灰中的砷大多富集在煤灰表面并以砷酸钙等砷酸盐形式存在，脱砷率与pH值和反应温度成反比. 综合考虑脱砷率、溶损率等因素，确定酸法最优脱砷条件为pH=1、反应温度20℃、反应时间1 h，此时脱砷率为66.34%. |
| 关 键 词： | 褐煤灰 砷酸盐 酸法 脱砷 pH 温度 时间 |
| 收稿时间： | 2017-10-18 |
Removal of arsenic in lignite fly ash by nitric acid |
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| Dajie HAN Shuhua MA Xiaohui WANG Jian DING Shili ZHENG Yang LUO Fen GUO.Removal of arsenic in lignite fly ash by nitric acid[J].Chinese Journal of Process Engineering,2018,18(4):716-721. | |
| Authors: | Dajie HAN Shuhua MA Xiaohui WANG Jian DING Shili ZHENG Yang LUO Fen GUO |
| Affiliation: | 1. School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
| Abstract: | Based on the occurrence of arsenic in lignite fly ash, a new acid removal method for some arsenic in fly ash was established. The effects of reaction temperature, time and pH on the arsenic removal rate were investigated. The results showed that most of arsenic in lignite fly ash was enriched on the surface of lignite fly ash and existed in the form of arsenate such as calcium arsenate. The arsenic removal rate was inversely proportional to the pH value and the reaction temperature. Considering the factors such as the arsenic removal rate and the dissolution rate, the optimum conditions for acid removal of arsenic were pH=1, reaction temperature 20℃, reaction time 1 h, the arsenic removal rate was 66.34%. |
| Keywords: | lignite fly ash arsenate acid method arsenic removal pH temperature time |
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