环境工程学报2017，Vol.11Issue(12)：6415-6420,6.DOI:10.12030/j.cjee.201702147
拜耳赤泥中镓的酸法浸出及残渣的除氟
Leaching gallium from Bayer red mud by acid process and removing fluoride from solution with leaching residues
摘要
Abstract
Guizhou bauxite ores are generally rich in gallium element,in Bayer process approximately 70％ of gallium,occurring as Ga2O3 in bauxite,is dissolved out and accumulates in Bayer liquor,the other of 30％ un dissolved Ga of the ores left in red mud without treatment,resulting in significant waste of gallium resources.In the present study,the gallium in red mud was investigated by employing four-factor three-level L9 (34) orthogonal experiments with hydrochloric acid leaching process.Moreover the property of leaching residues for removal fluoride from solution were examined.The results were as following:leaching tests:the priority of factors affecting on the gallium leaching from red mud follows hydrochloric acid addition amount ＞ leaching temperature ＞ liquid-solid ratio ＞ leaching time.The leaching of gallium was maximum of 94.92％ while the corresponding Ga3 + concentration in leaching solution was 3.91 mg · L-1in complementation tests under the optimal condition which was determined for 50 g of red mud as hydrochloric acid excessive coefficient of 1.2,leaching temperature of 70 ℃,liquid-solid ratio of 8 mL · g-1 for 3 h.Removal fluoride tests:an average removal efficiency for fluoride was 57.54％ under the conditions of leaching residues 25 g · L-1 at pH =4.7 for 6 h with 200 r · min-1 in room temperature,which showed that the leaching residues exhibited a good removal performance for fluoride solution treatment.关键词
拜耳赤泥/金属镓/浸出/浸出残渣/除氟Key words
Bayer red mud/Gallium/leaching/residues/removal fluoride分类
资源环境引用本文复制引用
路坊海,曾英,肖唐付,梁杰,伍玉娇,黄芳,龙琼,肖立华,刘冰,周登凤..拜耳赤泥中镓的酸法浸出及残渣的除氟[J].环境工程学报,2017,11(12):6415-6420,6.基金项目
国家自然科学基金资助项目(551664010,51664009,51664008) （551664010,51664009,51664008）
贵州省科学技术基金项目(黔科合J字[2014]2083号,黔科合LH字[2016]7095) （黔科合J字[2014]2083号,黔科合LH字[2016]7095）
