Characterization of coal fly ash from Israel
Characterization of coal fly ash from Israel
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DOI：
10.1016/s0016-2361(98)00144-6
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发表时间：
1999-01-01
期刊：
影响因子：
7.4
通讯作者：
Mimran, I
中科院分区：
文献类型：
--
作者：
Nathan, Y;Dvorachek, M;Mimran, I
以色列发电厂使用煤是相对较新的（1982年）。然而，哈代拉和阿什凯隆发电厂在1996年就已经产生了大约85万吨粉煤灰。大部分用作熟料（水泥）的添加剂。然而，由于发电量的增加，产生的灰量将按比例增加。据预测，到2000年，我国煤灰产量将达到120万吨。由于根据现行法律，80万吨灰是可以添加到熟料中的最大量，这意味着必须使用大量灰（每年约40万吨）（除了水泥生产）或在不污染环境的情况下处理掉。因此，在以色列开展了一项大型国家计划，以确定以色列产生的煤灰的特性，并研究煤灰沥滤液对地下水和土壤的潜在毒性影响。特别是，两个符合性测试进行了研究：欧洲CEN/TC 192和美国TCLP 1311方法。结果表明，TCLP 1311方法更适合于测试以色列产碱性粉煤灰。煤灰中的细颗粒，特别是极细颗粒（< 1 μ m），由于其大的活性表面积，在其重量浓度以上起着重要的作用。这对于浸出和物理性质都是重要的。我们使用计算机扫描电子显微镜特征分析来表征这些颗粒，并确定它们在两个工业粉煤灰中不同的小粒径之间的分布。虽然结果不是定量的，但它们为粉煤灰表征增加了相当多的知识。(C)1998爱思唯尔科技有限公司。保留所有权利。
The use of coal in electric power plants in Israel is relatively recent (1982). However, already in 1996, the Hadera and Ashqelon power plants had produced about 850 000 tons of fly ash. Most of it was used as an additive to clinker (cement). Nevertheless, because of the increase in electricity production, the amount of ash produced will increase proportionally. It is predicted that 1.2 million tons of coal ash will be produced by the year 2000. Since 800 000 tons of ash is the maximum that can be added to clinker under present legislation, this means that considerable quantities of ash (some 400 000 tons per year) will have to be used (apart from cement production) or disposed off without polluting the environment. As a consequence, a large national program was carried out in Israel to characterize coal ash produced in Israel and study the potential toxic effect of coal ash leachates on groundwater and soils. In particular, two compliance tests were studied: the European CEN/TC192 and the US TCLP 1311 methods. The results show that the TCLP 1311 method is more appropriate for testing the alkaline fly coal ash produced in Israel. The fine particles and particularly the very fine particles ( < 1 mu m) in coal ash play an important role above their weight concentration because of their large active surface area. This is significant both for leaching and physical properties. We used computerized scanning electron microscope feature analysis to characterize these particles and to determine their distribution among the different small grain sizes in two industrial fly coal ashes. While the results are not quantitative, they add considerable knowledge to coal fly ash characterization. (C) 1998 Elsevier Science Ltd. All rights reserved.