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分别采用硫酸铵与碳酸钠焙烧活化法浸出高铝粉煤灰中的铝,考察了焙烧条件(焙烧温度、焙烧时间、试剂添加量)对铝浸出效果的影响,并对焙烧物料和浸出渣的物相进行了分析,探讨了焙烧活化及酸浸提铝的机理.经380℃焙烧,莫来石与硫酸铵活化反应生成易溶于酸的NH4Al(SO4)2,酸浸后,粉煤灰中的铝被成功提取;900℃焙烧下,莫来石及Si O2与碳酸钠活化反应生成易溶于酸的Na Al Si O4,Na2Si O3和Al2O3,酸浸后,粉煤灰中的铝被成功提出,并生成Si O2.两种方法均能实现粉煤灰中铝、硅的分别提取,铝的浸出率超过92%.相较于硫酸铵法,碳酸钠法焙烧温度高,酸浸过程中液固比大,硫酸消耗量高,且易生成凝胶状Si O2而难以过滤分离.因此,硫酸铵焙烧活化-硫酸浸出提取高铝粉煤灰中的铝更具优势.
The effects of calcination conditions (calcination temperature, calcination time and reagent addition amount) on the leaching of aluminum were investigated by ammonium sulfate and sodium carbonate roasting and activation respectively. The effects of calcination and leaching residue The phases were analyzed and the mechanisms of roasting and acid leaching were discussed. After the roasting at 380 ℃, mullite and ammonium sulfate were activated to produce acid-soluble NH4Al (SO4) 2. After acid leaching, Aluminum is successfully extracted; under the condition of 900 ℃ calcination, mullite and Si O2 react with sodium carbonate to form acid-soluble Na Al Si O4, Na2Si O3 and Al2O3. After acid leaching, the aluminum in fly ash Successfully proposed and generate Si O2. Both methods can achieve separate extraction of aluminum and silicon fly ash, aluminum leaching rate of over 92%. Compared with the ammonium sulfate method, sodium carbonate roasting temperature is high, the acid leaching process Liquid-to-solid ratio, high consumption of sulfuric acid, and easy to generate gel-like Si O2 and difficult to filter separation, therefore, ammonium sulfate roasting activation - sulfuric acid leaching extract aluminum high fly ash more advantages.