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Conversion treatment of waste coal ash to zeolite and its utilization as materials for agriculture

废粉煤灰转化处理沸石及其农业材料利用

基本信息

批准号：
04453128
负责人：
HENMI Teruo
金额：
$ 3.39万
依托单位：
Ehime Univerity
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

A lot of waste coal ash has been produced by the plants such as thermal powerstation which are using coal and/or pulverized coal for fue. There are about 45 big thermal power stations in Japan, and they are discharging approximately 4 million tons of coal ash a yer. It is expected that the amount of the useless article will increase because of the further waste ash which will be released from coal thermal power plant to be constructed in the near future. So far, more than half of the coal ash has been disposed of as solid wastes for reclamation materials. It becomes, however, difficult to make sure constantly of the reclamed site for the disposal of the wastes, and such reckless disposal is a serious problem recently. Therefore, development of technique for the utilization of coal ash is indispensable to the means of solving the problem and to recycling waste matters. Coal fly ash was treated with 3.5 M NaOH water solution by heating to 80-90 C for 24h. The alkali treatment caused an increase in cation exchange capacity (CEC) from 12-20me/100g to 158-360me/100g for the fly ash. X-ray powder diffraction analysis showed that hydroxy-sodalite, faujasite and phillipsite formed in theash after the treatment. The formation of such zeolite was most likely responsible for the increase of CEC.The zeolitized coal ash was shown to have preferable efficaciousness for soil conditioner. It was possible to apply the zeolotized ash to materials for removal of toxic heavy metal ions from soils, deodrization of excrement of domestic animals such as poultry manure. The outcome of the study is promising in further development of a tecnology for the utilization or recycling of waste coal ash which is an unwelcome by-product inevitably formed through human activities using coal as raw material and energy source. Thus, the present result is useful in opening the way for disposal of industrial solid waste products to control the pollution for environmental protection.

火力发电厂等使用煤炭和/或煤粉作为燃料的工厂产生了大量废粉煤灰。日本大约有45座大型火力发电站，它们每年排放大约400万吨煤灰。预计在不久的将来，由于将从即将建设的燃煤火力发电厂释放出更多的废灰，无用物品的数量将增加。到目前为止，一半以上的煤灰已被作为固体废物处理，用于再生材料。然而，很难不断地确定用于处置废物的填海场地，这种轻率的处置是最近的一个严重问题。因此，开发粉煤灰的综合利用技术，是解决这一问题和实现废物资源化的必由之路。用3.5M NaOH水溶液加热至80-90 ℃处理粉煤灰24小时。碱处理使粉煤灰的阳离子交换容量（CEC）从12- 20 me/100 g增加到158- 360 me/100 g。X射线粉末衍射分析表明，处理后的灰中生成了羟基方钠石、八面沸石和钙十字石。沸石的形成是导致阳离子交换量增加的主要原因，沸石化粉煤灰具有较好的土壤改良效果。沸石灰可用于去除土壤中有毒重金属离子、家禽粪便等家畜粪便的除臭等。该研究的结果是有希望的，在进一步开发的技术，用于利用或回收废煤灰，这是一个不受欢迎的副产品，不可避免地形成通过人类活动使用煤作为原料和能源。研究结果为工业固体废弃物的处理开辟了道路，为控制污染、保护环境提供了依据。