粉煤灰中有价元素的强化浸出研究  

Research on Strengthening Leaching of the Valuable Elements in Fly Ash

作　　者：梁金奎[1,2] 刘晓荣[2] 罗林根[2] 潘婷[2] 胡鹤炯[2] 

机构地区：[1]上海水产大学食品学院,上海200090 [2]上海应用技术学院材料工程系,上海200235

出　　处：《矿冶工程》2008年第6期76-79,83,共5页Mining and Metallurgical Engineering

基　　金：上海市重点学科建设基金资助项目(P1502)

摘　　要：采用焙烧-微波场酸浸联合工艺,强化粉煤灰中有价元素的浸出。研究表明,焙烧-酸浸时,硅、铝、铁的浸出率分别仅有0.72%、40.05%、41.30%;采用焙烧-微波场酸浸联合工艺,硅、铝、铁的浸出率分别达到1.63%、59.17%、49.20%,提高了126%、48%、19%。对原料粉煤灰和焙烧后粉煤灰进行XRD、SEM及EDS分析表明,焙烧-微波场酸浸联合工艺的强化浸出机理是:粉煤灰和钠盐混合焙烧破坏了粉煤灰中莫来石的SiO2—Al2O3键,生成活性高的物质;同时微波加热能提高反应物分子的内能,降低反应活化能,从而加快粉煤灰中有价元素的浸出速率,缩短反应时间,提高浸出率。Calcination-microwave acid leaching combination process was used to strengthen the leaching of valuable elementsin fly ash. The results showed that the leaching rates of silicon aluminum and iron were 0.72% 40.05% and 41.30% respectively by calcination-acid leaching process while the leaching rates of silicon, aluminum and iron were up to 1.63%, 59.17% and 49.20% respectively by calcination-microwave acid leaching combination process, which increased by 126%, 48% and 19%. Analysis on raw material fly ash and calcined fly ash by XRD, SEM and EDS indicated that the mechanism of strengthening leaching by calcination-microwave acid leaching calcination process was that SiO2-Al2O3 bond of mullite in fly ash was destroyed by the combination calcination of fly ash and sodium salt and high active material generated. Meanwhile microwave heating raised the internal energy of reactant molecular and decreased activation energy of reaction, which speeded up the leaching velocity of valuable elements in fly ash, shortened reaction time and increased the leaching rate.

关 键 词：粉煤灰 有价元素 微波场 强化浸出 

分 类 号：TF111[冶金工程—冶金物理化学]