Digestion reactions of paper sludge combustion ash in strong alkaline solutions at 60 °C
Digestion reactions of paper sludge combustion ash in strong alkaline solutions at 60 °C
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造纸污泥燃烧灰在60℃强碱性溶液中的消化反应
DOI：
10.1007/s10163-014-0320-4
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发表时间：
2016
影响因子：
3.1
通讯作者：
Lindemann
中科院分区：
文献类型：
--
作者：
Hartmann;Petrov;Rübner;Lindemann
使用富含方解石的纸灰（PA 1）和富含钙铝黄长石的灰（PA 2）在低温（60 °C）下进行造纸污泥燃烧灰的碱性反应。在1-4 h和12-24 h的反应时间下显示出强碱性条件（8、12、16 M NaOH）。反应用纯灰和在NaAlO 2的存在下进行。采用XRD、FTIR、SEM/EDX、重量分析和化学分析等手段对产物进行了表征。发现转化主要在1至4小时之间的时间段内进行。在8 M NaOH中从PA 1中观察到钙钛矿和水石榴石。在PA 1在12 M和16 M NaOH中反应后，可以分析除了Ca（OH）2之外的Ca4Al2O6CO3.11H2O形成的开始。NaAlO 2的加入有利于水石榴石和Ca_4Al_2O_6CO_3·11H_2O的结晶。对于PA 2钙铝黄长石保持稳定，但观察到高的氢氧钙石分数。在8 M NaOH溶液中加入NaAlO 2，除钙铝黄长石外，还得到水石榴石。较高的碱度有利于Ca_4Al_2O_6CO_3.11H_2O的结晶和钙铝黄长石的溶解。最后观察到Ca_4Al_2O_6CO_3·11H_2O转化为水合硅酸铝钠。所有的结果进行了讨论，关于重金属分布的初始PA之间的碱性消化溶液和产品。最后提出了产品的应用前景。
Alkaline reactions of paper sludge combustion ash at low temperature (60 °C) were performed using a calcite-rich paper ash (PA 1) and a gehlenite-rich ash (PA 2). Strong alkaline conditions (8, 12, 16 M NaOH) were revealed at reaction times of 1–4 h and 12–24 h. Reactions were performed with pure ashes and in the presence of NaAlO2. The products were characterized by XRD, FTIR, SEM/EDX, gravimetry and chemical analysis. The conversion was found to proceed mainly in the period between 1 and 4 h. Portlandite and hydrogarnet were observed from PA 1 in 8 M NaOH. Onset of formation of Ca4Al2O6CO3.11H2O beside Ca(OH)2could be analyzed after reaction of PA 1 in 12 M and 16 M NaOH. Addition of NaAlO2favored crystallization of hydrogarnet and Ca4Al2O6CO3.11H2O. For PA 2 gehlenite remained stable, but a high portlandite fraction was observed. Addition of NaAlO2yielded hydrogarnet beside gehlenite in 8 M NaOH. Higher alkalinities favored crystallization of Ca4Al2O6CO3.11H2O and onset of dissolution of gehlenite. Finally transformation of Ca4Al2O6CO3.11H2O into sodium aluminum silicate hydrate was observed. All results were discussed with regard to heavy metal distribution of the initial PA between the alkaline digestion solution and the products. In conclusion suitable applications of the products were proposed.
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