【摘要】：針對(duì)現(xiàn)有粉煤灰提取氧化鋁方法中存在的問(wèn)題,采用硫酸固相轉(zhuǎn)化法從粉煤灰中提取氧化鋁,考察了硫酸用量、反應(yīng)溫度和時(shí)間、升溫速度等因素對(duì)鋁轉(zhuǎn)化率的影響。利用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)和能譜分析(EDS)等手段對(duì)粉煤灰提取鋁工藝過(guò)程中各樣品的微觀形貌和結(jié)構(gòu)組成變化進(jìn)行研究。結(jié)果表明,粉煤灰與濃硫酸反應(yīng)后,粉煤灰中的偏高嶺石、莫來(lái)石等鋁硅酸鹽礦物顆粒受到硫酸浸蝕轉(zhuǎn)變成硫酸鋁和二氧化硅;固相轉(zhuǎn)化后的熟料用水洗即可將鋁浸出而與硅分離;硫酸用量、溫度及升溫速度對(duì)轉(zhuǎn)化率的影響較大,轉(zhuǎn)換率可達(dá)94%以上。
[Abstract]:Aiming at the problems existing in the existing methods of extracting alumina from fly ash, the effects of the amount of sulfuric acid, reaction temperature and time, and heating rate on the conversion of aluminum were investigated by using solid phase transformation of sulfuric acid to extract alumina from fly ash. By means of X-ray diffraction (XRD),) scanning electron microscope (SEM) and energy dispersive analysis (EDS), the changes of microstructure and composition of the samples in the process of extracting aluminum from fly ash were studied. The results show that after the reaction of fly ash with concentrated sulfuric acid, the aluminosilicate particles in fly ash, such as metacolinite and mullite, are transformed into aluminum sulfate and silica by sulfuric acid erosion. After solid phase transformation, aluminum can be leached and separated from silicon by washing with water, and the amount of sulfuric acid, temperature and heating rate have great influence on the conversion rate, and the conversion rate can reach more than 94%.
【作者單位】： 北京礦冶研究總院;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)資助項(xiàng)目(2007AA06Z128) 北京礦冶研究總院科研基金項(xiàng)目(02-1502)
【分類號(hào)】：TQ133.1;X705

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本文編號(hào)：2261314