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    • 12. 发明公开
    • METHOD FOR EXTRACTING GALLIUM FROM FLY ASH
    • 从粉煤灰中提取镓的方法
    • EP2565284A1
    • 2013-03-06
    • EP11774394.8
    • 2011-04-27
    • China Shenhua Energy Company Limited
    • LING, WenJIANG, YinshanWEI, CundiLI, NanGU, DazhaoGUO, ZhaohuaYANG, DianfanCHI, JunzhouZOU, Ping
    • C22B58/00C22B3/24C25C1/22
    • C25C1/22B03C1/03B03C1/032B03C1/0335B03C2201/18C22B3/10C22B3/42C22B3/44C22B7/007C22B7/02C22B58/00Y02P10/234
    • Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using hydrochloride acid (2) to obtain hydrochloric acid leachate; adsorbing gallium in the hydrochloric acid leachate with macro-porous cationic resin, followed by eluting to obtain the eluent (5) containing gallium; adding sodium hydroxide (6) solution into the eluent containing gallium to react and obtaining sodium metaaluminate solution containing gallium (8); introducing CO 2 into the sodium metaaluminate solution containing gallium (8) for carbonation, followed by separating gallium from aluminum and obtaining aluminum-gallium double salt (15) with the gallium to alumina mass ratio being more than 1:340; adding the aluminum-gallium double salt (15) into sodium hydroxide (17) to react, followed by alkalinity-adjustment concentration to obtain alkali solution containing gallium and aluminum; electrolyzing (10) the alkali solution containing gallium and aluminum to obtain metal gallium (11). The method simplifies the process and improves extraction efficiency of gallium.
    • 本发明公开了一种从粉煤灰中提取镓的方法,包括以下步骤:粉碎粉煤灰并通过磁力分离除去Fe; 然后用盐酸(2)溶解得到盐酸浸出液; 用大孔阳离子树脂吸附盐酸浸出液中的镓,然后洗脱得到含镓的洗脱液(5); 在含有镓的洗脱液中加入氢氧化钠(6)溶液进行反应,得到含镓(8)的偏铝酸钠溶液; 将二氧化碳引入含镓(8)的偏铝酸钠溶液中进行碳酸化,随后从铝中分离镓并获得铝镓复盐(15),镓与氧化铝的质量比大于1:340; 将铝镓复盐(15)加入氢氧化钠(17)中反应,调节碱度浓度得到含镓和铝的碱溶液; 电解(10)含有镓和铝的碱性溶液以获得金属镓(11)。 该方法简化了工艺并提高了镓的提取效率。