垃圾焚烧飞灰基本特性研究
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摘要: 以三个正在运行的垃圾发电厂的除尘器飞灰为研究对象，实验测出它们的化学组成、热灼减率、灰熔点等物化特性和浸出毒性、腐蚀性等有害特性，对三种灰样的特性进行了对比、分析。结果表明，飞灰的物化特性主要受飞灰中MgO、CaO、SiO2和CaCl2等几种主要成分质量分数的影响。MgO和Al2O3质量分数较高而CaCl2质量分数较低的飞灰其灰熔点相对较高；CaO和CaCl2质量分数较高的飞灰其水分和热灼减率也相对较高；SiO2质量分数较高的飞灰其重金属的浸出率相对较低；CaO和Al2O3等碱性氧化物质量分数较高的飞灰其浸出液的pH值相对较高。Abstract: The basic properties of three fly ash samples taken from three different municipal solid waste (MSW) incinerators in China were explored by a serious of experiments, concerning their chemical composition, weight loss during calcination, melting point and leaching toxicity etc. The effect of chemical composition of fly ash on its chemical and physical characteristics as well as leaching toxicity was mainly investigated. It was found that physical and chemical characteristics of fly ash are mainly affected by the mass percentage of MgO, CaO, SiO2 and CaCl2. Fly ash with higher MgO and Al2O3 content and lower CaCl2 content has relatively higher melting point. Fly ash with higher CaO and CaCl2 content has relatively higher moisture and weight loss in calcination. Fly ash with higher SiO2 content has lower leaching rate of heavy metal.
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Key words:
- combustion of municipal solid waste (MSW) /
- fly ash /
- leaching toxicity /
- causticity
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