低压条件下垃圾焚烧飞灰碳酸化固碳脱毒实验研究-热能工程专业论文.docxVIP

华中科技 大学硕士 学 华 中 科 技 大 学 硕 士 学 位 论 文 II II 出浓度，但是增加了重金属 Cd 的浸出。WH1、WH2 两种灰样的 Zn 在经过碳酸化处 理之后，浸出浓度增加，而上海灰样则有增加有减少。此外，在以最佳液固比条件对 飞灰进行碳酸化处理之后，Pb、Cr、Co、Ni、Cu、As、Hg 的浸出通常都能降低至最 低。 关键词：生活垃圾焚烧飞灰; 碳酸化; 碳固定; 重金属; 浸出毒性 III III Abstract Nowadays, solid waste incineration technology has been widely used in the processing of municipal solid waste in our country. However, large amounts of toxic fly ash could be produced during the solid waste incineration process, which definitely need stabilizing treatment before its final landfill disposal since it contains high concentration of dioxin, soluble salts and heavy metals. In the meantime, certain amount of CO2 also could be released into the atmosphere to aggravate the green house effect. In this regard, fly ash carbonation treatment on the one hand can be able to absorb a part of the CO2 to form carbonate minerals, and on the other hand, the heavy metals in the fly ash can be trapped in the newly formed carbonate mineral, hence reducing its leaching toxicity. It has been recognized as a potential way of better application prospect. In this paper, fly ash samples of three different municipal solid waste incineration power plants were collected and respectively treated through carbonation process with pure CO2 under different water-solid-ratio, temperature, and reaction time conditions. The X-ray diffraction (XRD), Scanning Electron Microscopy, thermogravimetry-differential scanning calorimetry (TG-DSC) and Horizontal Vibration Method (HJ 557-2009) were used to analyze the crystalline phase and microstructure of fly ash sample, the amount of CO2 absorbed by the carbonation process and leaching characteristic of heavy metals (Pb、Cu、 Zn、Cr、Cd、Co、Ni、As、Hg) before and after the carbonation process. In addition, finish the preliminary design of cold test bench of bubbling fluidized bed for further dynamic carbonation experimental study. The XRD analysis results showed that the peak of Ca(OH)2 and CaClOH of Shanghai fly ash samples disap