Development of Waste Melting System and the Utilization of the Melted Slag

垃圾熔化系统的研制及熔化炉渣的利用

基本信息

批准号：
10555191
负责人：
MOMONOI Kiyoshi
金额：
$ 6.4万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Solid waste melting, which vitrifies wastes by thermal treatment, is accepted as an effective recycling technology. In this study, effects of the main composition (SiO2, CaO, and Al2O3) of ash on various properties in melting were studied. Items examined were such as : (1) melting characteristics of ash from an economic view, (2) physical strength of melted slag in view of its quality, (3) leaching characteristics of heavy metal (Pb) from melted slag in view of environmental safety.Melting characteristics was evaluated by method of microheating (JIS K 2151). The lowest melting point was found in the basicity (Cao/SiO2) of 0.54-1.07 with Al2O3 ratio of about 10mol%. Physical strength of slag was evaluated by an abrasion test. The strength had a close relationship with the crystallinity of slag, and the weight loss of crystallized slag in the test was much lower that of uncrystallized slag. Leaching of Pb from melteh slag was examined by leaching test with acid condition of pH=4. Pb leaching concentration was more than 1mg/L in the basicity of 0.53-3.2 with Al2O3 ratio of 6-15 mol%.As the results, it was shown that the properties were greatly influenced not only by basicity but also by a change of Al2O3 ratio, and trade-off relations existed in the properties. Therefore, adjustment of main ash composition should be done according to the purpose of recycling.In addition, the utilization of the melted slag such as a material for a self-compacting concrete, was investigated.

固体废物熔化通过热处理将废物液化为有效的回收技术。在这项研究中，研究了灰分主要组成（SiO2，CAO和Al2O3）对熔化中各种特性的影响。所检查的项目如下：（1）从经济角度来看，灰分的熔化特性，（2）鉴于其质量的融化炉灶的物理强度，（3）通过融化的矿石的浸出特性，鉴于环境安全性。熔化的特征是通过微热处理方法评估的（JIS K 2151）。最低的熔点在0.54-1.07的碱性（CAO/SIO2）中发现，Al2O3比约为10mol％。通过磨损测试评估炉渣的身体强度。强度与炉渣的结晶性有着密切的关系，测试中结晶炉灶的重量损失大大低于未结合的炉渣。通过浸出测试的酸性状态pH = 4，通过浸出测试检查了PB的浸出。在0.53-3.2的碱性中，Pb浸出浓度超过1mg/L，Al2O3比为6-15 mol％。结果，结果表明，这些性质不仅受碱性不仅受碱性的影响，而且还受Al2O3比的变化，并且在这些特性中存在权衡关系。因此，应根据回收的目的进行主要灰分组合物的调整。此外，研究了融化的炉渣的利用，例如一种自我压缩混凝土的材料。