Evaluation of Coal Fly Ash and Incineration Ash as Raw Material for Zeolite Synthesis.
Evaluation of Coal Fly Ash and Incineration Ash as Raw Material for Zeolite Synthesis.
复制标题
粉煤灰和焚烧灰作为沸石合成原料的评价。
DOI：
10.2473/shigentosozai.117.501
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Shibata
中科院分区：
文献类型：
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作者：
N. Murayama;Yousuke Yamakawa;K. Ogawa;Hideki Yamamoto;J. Shibata
以粉煤灰、造纸污泥灰、城市垃圾焚烧飞灰、垃圾焚烧飞灰和污泥焚烧飞灰为原料，研究了沸石的合成。水热反应条件为：NaOH浓度为1.5或2.0mol/dm ~ 3，反应时间为3或5 h，料浆浓度为20wt%，反应温度为393 K。研究了不同灰渣合成产物的颗粒表面结构、阳离子交换容量、化学组成等性能。还评价了原材料的适当性。本文以粉煤灰和造纸污泥灰为原料，分别制备了P型沸石和羟基方钠石，并对其进行了实验研究。以城市垃圾焚烧飞灰为原料，通过水洗和酸洗去除焚烧飞灰中的可溶性或酸溶性杂质，合成了具有足够阳离子交换能力的沸石。影响沸石固液分离的因素主要是焚烧灰中钙组分和未燃碳的含量。当钙组分和未燃碳的含量分别超过30%和10wt%时，沸石的固液分离变得非常困难。这是由于焚烧灰中的钙成分和未燃碳在碱溶液中转化为密度小的小漂浮物。
Zeolite syntheses were examined using coal fly ash, paper sludge ash, municipal waste incineration fly ash, RDF fly ash and swage sludge incineration ash as raw material. The hydrothermal reaction was performed under the following conditions; NaOH concentration of 1.5 or 2.0mol/dm3, reaction time for 3 or 5h, slurry concentration of 20wt% and reaction temperature at 393K. Properties such as structure of particle surface, cation exchange capacity, chemical composition and so on were investigated for the products synthesized from various ashes. The propriety of the raw material was also evaluated. These characterized various natures including solid-liquid separation habit, which is an important factor for designing the production equipment of zeolite.Zeolite P and hydroxysodalite could be produced from raw materials of coal fly ash and paper sludge ash in the present work. Zeolite with sufficient cation exchange capacity was synthesized from municipal waste incineration fly ash, when it was treated with water washing and acid washing in order to remove soluble or acid-soluble impurities in incineration ash. The factors affecting solid-liquid separation of zeolite owe mainly to the contents of calcium component and unburned carbon in the incineration ash. The solid-liquid separation of zeolite becomes extremely difficult when the contents of calcium component and unburned carbon exceed 30% and 10wt%, respectively. This is explaned by the phenomenon that the calcium component and unburned carbon in the incineration ashes are converted to the small floating materials with small density in alkali solution.