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城市垃圾焚烧飞灰处理技术及其在水泥生产中资源化利用 总被引:3,自引:0,他引:3
分析了城市垃圾处理技术的现状和发展趋势;介绍了城市垃圾焚烧飞灰处理技术的发展和资源化利用的紧迫性;阐述了水泥生产中资源化利用垃圾焚烧飞灰的可行性和前景;回顾了国内外水泥生产协同处理固体废物技术的发展历程,并提出了目前亟需解决的一些关键技术。在广泛研究的基础上,明确指出了水泥生产中资源化利用垃圾焚烧飞灰是实现焚烧飞灰资源化利用和无害化处理的重要途径。 相似文献
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建筑废弃物产量大,现有技术模式下资源化利用水平较低,应当寻求新的资源化利用途径。建筑废弃物可通过物理、化学和生物过程去除水体中的污染物,具备在污水处理领域进行资源化利用的潜力。综述了建筑废弃物的种类和性质,并根据其性质不同分为水泥基建筑废弃物和非水泥基建筑废弃物,其中水泥基建筑废弃物可利用水泥水化形成的氢氧化钙和钙矾石高效稳定地去除污水中的磷、氟、含氧酸盐与重金属离子,而非水泥基建筑废弃物则可作为填料与微生物、湿地植物等协同去除污水中的悬浮物、有机物与氮磷,对建筑废弃物在污水处理中的研究和应用进行了归纳总结,指出了相关研究在实际工程应用、处理成本及能耗、研究应用领域和机理机制研究方面的不足,并展望了建筑废弃物资源化利用未来的发展方向,以期加速已有技术工程验证、研发新处理技术、拓宽技术应用领域并深化微观机理研究。 相似文献
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垃圾焚烧飞灰水洗提盐(FWD)和水泥窑协同处置技术是飞灰资源化处置技术。技术的主要原理是利用飞灰中氯盐易溶于水的特性,和飞灰成分与水泥原料成分比较相近的特点,首先将飞灰中的氯盐通过水洗的方法进行分离制盐,然后把脱氯后的飞灰利用水泥窑协同处置高温煅烧制成水泥熟料。该技术包括五个系统,分别是飞灰洗脱系统、水质净化系统、蒸发制盐系统、烘干系统和入窑系统。该项技术已成功应用于飞灰的规模化处置工程,氯元素去除率达95%以上,可将飞灰处置成工业二级副产盐和水泥熟料原料,整个工艺无废气、废水外排,完全实现了飞灰处置的资源化、无害化、减量化。该技术充分利用了水泥窑高温窑炉的特点和飞灰的特有性质,尤其适用于水泥行业的环保转型和危废的资源化处置,其有很好的发展前景。 相似文献
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垃圾焚烧飞灰资源化处理的研究状况与存在问题 总被引:3,自引:0,他引:3
就当前飞灰资源化处理的主要途径如熔融固化、药剂稳定化、作为混合材处理、烧结生态水泥和其研究状况作了简要介绍,并就当前存在的一些问题作了剖析,同时提出开发适合我国国情的飞灰资源化利用工艺技术,促进经济可持续发展. 相似文献
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为探究垃圾焚烧飞灰中重金属固化/稳定化领域的研究现状和研究方向,利用CiteSpace文献计量工具,以知网和Web of Science数据库收录的期刊作为数据来源,对近10年垃圾焚烧飞灰中重金属固化/稳定化研究领域的相关文献进行分析。分析结果指出,化学药剂螯合技术、地质聚合物固化技术和高温熔融固化技术等备受关注。传统无机化学药剂和有机螯合剂的重金属固化效果不稳定且提高了城市废弃物处置的需求。因此,广大学者聚焦于推进新型重金属固化/稳定化药剂(例如:垃圾焚烧底灰、气相二氧化硅、巯基官能化树枝状聚合物和二硫代羧基功能化四乙基五胺)的研发。地质聚合物固化/稳定化技术的研究尚在起步阶段,垃圾焚烧飞灰的添加量可能是接下来研究的重点。电阻熔融玻璃化技术因其特有的冷料层在垃圾焚烧飞灰处置领域大规模推广的潜力较大,未来在强化电阻熔融玻璃化技术的同时还需推进助熔剂的研究。综上,垃圾焚烧飞灰处理技术多样,依靠单一工艺难以彻底实现垃圾焚烧飞灰的减量化、无害化和资源化处置。因此,急需研发垃圾焚烧飞灰处置与资源化利用成套技术,以建立适应国内发展实际的垃圾焚烧飞灰处理处置与资源化利用新模式。 相似文献
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可持续发展与粉煤灰的建材资源化 总被引:4,自引:0,他引:4
对可持续发展与粉煤灰建材资源化的涵义和关系进行了讨论,进而指出粉煤灰建材资源化是粉煤灰资源化的最佳途径,以及粉煤灰建材资源化尚需开展的工作 相似文献
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The main objective of this study is to utilize a class F fly ash as base material in road pavements. Since class F fly ashes do not manifest desirable engineering properties for this purpose, it was decided to stabilize the material with cement. Fly ash may be utilized with or without aggregate as a pavement layer. It should be noted that, in this research only aggregate free stabilized mixtures (fly ash and cement only) were used since the aim was to utilize high volumes of this waste material. Cement content in the stabilized, laboratory prepared samples were between 2%, 4%, 8%, and 10% by total weight. Initially, Texas triaxial test was carried out to justify the suitability of the fly ash as pavement material. Then, mechanical tests were performed to obtain the fundamental properties of the cement stabilized material in order to analyze the pavement structure. Under repeated wheel loading, fatigue cracking is the primary mode of failure of stabilized materials in which cracks initiate due to the repeated tensile stresses. Utilizing an accelerated full scale road test data for the fatigue performance of cement stabilized fly ash and performing a mechanistic-empirical design procedure, required layer thickness for different lives were obtained for different amount of cement content. 相似文献
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粉煤灰是火电厂燃煤过程中产生的固体残渣, 其成分复杂, 具有毒性, 若处理不当会对环境造成危害。因此, 粉煤灰的高附加值利用迫在眉睫。然而, 粉煤灰的品质是制约其高附加值利用的主要因素。目前, 中国粉煤灰品质参差不齐, 缺少完善的品质评价体系, 由此造成粉煤灰利用领域的局限性。针对上述问题, 首先分析了中国粉煤灰的资源化特性, 总结了粉煤灰的品质评价方法, 并重点阐述了适用于粉煤灰高附加值利用的品质评价方法;其次, 详细介绍了粉煤灰高附加值利用技术(高附加值提取技术、高附加值材料制备技术);最后, 对粉煤灰高附加值利用的发展趋势做出了展望。 相似文献
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Triboelectrostatic separation of fly ash and charge reversal 总被引:1,自引:0,他引:1
John P. Baltrus 《Fuel》2002,81(6):757-762
Triboelectrostatic separation has been investigated as a method for separating unburned carbon from coal combustion fly ash. It was found that when a fly ash is exposed to moisture before it undergoes separation, the charging properties of the components of the fly ash change significantly. The mineral and carbon components of the fly ash appear to charge oppositely to how they were charged before exposure to moisture. A correlation was found between the degree of charge reversal and the relative amounts of leachable ions, especially calcium and sodium ions, present on the surface of the ash. 相似文献
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Using fly ash as a reinforcing filler can be very cost effective; however, the recycling of postconsumer products containing fly ash is of a considerable concern. In this study, the recycling of processed polyvinyl chloride (PVC) foam reinforced with fly ash was investigated by evaluating the effect of regrind content (up to 40 wt%) and fly ash content (up to 20 wt%) on the physical, mechanical, microstructural, and processing properties of the composites. Experimental results show an increase in the foam density with increasing regrind and fly ash contents. The melt viscosity increased with increasing the regrind concentration; however, it dropped with increasing the fly ash content. The tensile strength increased with increasing the regrind content, indicating a good degree of gelation in the composites. Meanwhile, the charpy impact strength of the composites decreased due to the high rigidity of fly ash particles. Dynamic mechanical analysis show that the storage modulus improved with both the addition and increasing the amount of regrind, which confirmed good stress transformation between the polymer foam matrix and the fly ash particles. The polymer matrix morphology, as was determined by scanning electron microscopy (SEM), confirmed uniform foam structure even with the addition of 40 wt% regrind in the virgin PVC. J. VINYL ADDIT. TECHNOL., 24:154–161, 2018. © 2016 Society of Plastics Engineers 相似文献
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