废印刷线路板资源化研究进展

从废印刷线路板(WPCBs)层间热固性树脂的角度出发,将WPCBs资源化处理技术归纳为热固性树脂直接回收法、热固性树脂分解法和热固性树脂溶胀法,并对现有资源化技术进行总结,同时对将来研究方向进行了展望,为WPCBs资源化产业化发展提供参考。     

电子废弃物回收利用领域技术开发难点问题探讨

电子废弃物的资源化、减量化和无害化问题正日益受到人们的关注和重视。废弃电子线路板、硬质聚氨酯泡沫塑料、CRT显像管物料的回收利用已成为废旧电子产品处置中的三大难题。结合承担国家和省相关项目的进展，根据中国国情，提出了资源化、无害化处置上述三类电子废弃物的技术方案。     

湖南万容科技股份有限公司

<正>城乡废弃物资源化利用系统服务商湖南万容科技股份有限公司成立于2006年,注册资本6500万元。公司定位于固体废弃物环保处置与资源化利用领域,致力构建一个集"环保装备研发制造"、"电子废弃物、报废汽车回收拆解"、"产业废弃物、生活垃圾资源化利用"、"金属资源"、"绿色能源"开发于一体的循环经济产业体系。在环保装备制造领域,公司自主研发的"废印制电路板环保处理设备"、"废旧冰箱无害化处理设备""报废汽车破碎及废钢加工一体化设备"、"报废汽车快速解体机"等先后通过国家部级科技成果鉴定,获得"国家信息产业重大技术发明"、     

浅谈综合性危废处置与资源化工厂废气的焚烧协同处置

综合性危废处置与资源化工厂在实现对外来危废无害化、资源化的同时,可协同处置工厂本身的废气.在协同处置废气时,评估不同类废气的特性、安全输送方式、风量平衡等,利用焚烧系统的热分解作用有效净化废气.协同处置能带来可观的经济效益.     

废旧玻璃钢的回收利用

介绍了目前国内外热固性玻璃钢废弃物的回收利用方法,着重论述了化学热解回收法和物理粉碎回收法,对不同方法的回收料用于BMC和SMC的产品的性能进行了对比,分析了我国在玻璃钢回收方面的主要问题和发展方向.     

潮汕农村工业固废处理处置现状分析

以潮州、汕头、揭阳等地农村为研究对象,通过问卷调查和实地考察方式,对农村工业固废处理处置现状进行调查,了解潮汕农村工业固废现状及其处理处置方法。调查结果表明:潮汕农村工业固废随地域不同、行业不同而不同,其处理处置方式多以回收利用为主,但部分地区仍存在随意丢弃、就地焚烧、回收利用率低、未分类等问题。结合当地实际情况,建议革新生产工艺,健全固废回收机制,完善法律法规,同时加强宣传教育,鼓励进行专业研究,以期将工业固废减量化、资源化,实现工业循环经济。     

废弃风电叶片资源化处置与利用工艺对比分析

对不同废弃风电叶片资源化处置技术进行分析对比,了解各自优缺点,重点对热回收法中的热解及焚烧法进行了综合性试验研究,建议对于废弃风力发电叶片可优先采用利用水泥窑协同处置工艺路线。     

《废旧家电资源化技术》书评

正我国已成为家用电器的生产大国和世界家电的制造业基地,同时也正在成为废弃物产生大国。废旧家电中含有大量有色金属、黑色金属、高分子材料和无机非金属材料,不仅占用大量宝贵资源,而且对其不合理的处置和回收还会给环境造成极大污染。作者为了配合国家相关政策的出台和实施,本着为电子废弃物处理处置行业的发展提供科技支撑的意愿,在总结"江苏省电子废弃物利用与处置企业准入条件研究"、"国家科技支撑计划项目——废线     

有色金属行业含砷废弃物处置技术的研究进展

介绍了有色金属行业中含砷废弃物的两种处理技术——资源化和稳定化-固化的研究进展。从含砷的烟灰、废水及废渣3个方向对资源化处理技术的研究进展进行了介绍，含砷废弃物经资源化处理后可得到As2O3和砷酸盐产品，但砷产品品种有限，应开发新的资源化途径和砷产品。此外，综述了含砷废弃物的稳定化-固化处置技术的研究进展，指出铁盐稳定化优于钙盐稳定化，特别是臭葱石形式的沉淀具有稳定性高、堆存时间长和无需再固化的优点；对比了包胶固化、火法固化及熔融固化3种固化技术的特点，其中水泥包胶固化法的成熟度较高，但仍有改进空间。     

餐厨废弃物的环境昆虫处理途径及资源化利用探讨

餐厨废弃物的不当处理,不但直接影响城市容貌、污染地下水、食品安全及人们身体健康,同时造成巨大的资源浪费.餐厨废弃物的处理已经成为政府及社会广为关注的重大问题.介绍了餐厨废弃物处置管理的意义,分析了目前几种生物处理技术的现状,提出了利用环境昆虫进行餐厨废弃物资源化利用的有关建议.     

工业贮池防腐材料及其施工性能

总结了常用的工业贮池防腐蚀处理方法、防腐蚀材料的性能及施工过程和要点,比较了玻璃钢衬里、玻璃鳞片与乙烯基酯树脂混合衬里和耐酸块材砌筑等防腐蚀处理工艺的工艺条件,并介绍了玻璃钢衬里工艺中所用树脂的类型及性能.     

Efficient chemical recycling of waste fiber-reinforced plastics: use of reduced amounts of dimethylaminopyridine and activated charcoal for the purification of recovered monomer

We have achieved major improvements in the efficient chemical recycling of waste fiber-reinforced plastics (FRPs). The effects of reduction in the amounts of dimethylaminopyridine (DMAP) used for depolymerization were examined. The treatment of waste FRP in the presence of 1 or 2 wt% DMAP resulted in the successful recovery of monomeric materials that could be employed in the polymerization process to produce recycled plastic. The separation of linker units from glass fiber, however, was unsuccessful. The purity of the recovered monomeric material, when treated with activated charcoal, was improved to about 70%. This resulted in effective decoloration of the recovered monomer. Finally, the purified material, after undergoing repolymerization, provided high-quality recycled plastic comparable to new plastics produced from new monomers.     

废旧塑料的再生及其在制管行业中的应用

总结了再生、降解、焚烧及填埋等几种废旧塑料处置方式的特点,指出对于品种单一、老化程度低的废旧塑料应优先选择再生利用.重点介绍了废旧聚氯乙烯塑料、聚乙烯塑料、聚丙烯塑料、氯化聚氯乙烯塑料的再生及其在制管行业中的利用情况进展.     

Recycling of an acrylate–glass fiber reinforced polyester composite

Journal of Material Cycles and Waste Management - Recycling possibilities were evaluated for a composite waste composed of glass fiber reinforced polyester bound to a layer of crosslinked...     

Sustainable Bio-Composites from Renewable Resources: Opportunities and Challenges in the Green Materials World

Sustainability, industrial ecology, eco-efficiency, and green chemistry are guiding the development of the next generation of materials, products, and processes. Biodegradable plastics and bio-based polymer products based on annually renewable agricultural and biomass feedstock can form the basis for a portfolio of sustainable, eco-efficient products that can compete and capture markets currently dominated by products based exclusively on petroleum feedstock. Natural/Biofiber composites (Bio-Composites) are emerging as a viable alternative to glass fiber reinforced composites especially in automotive and building product applications. The combination of biofibers such as kenaf, hemp, flax, jute, henequen, pineapple leaf fiber, and sisal with polymer matrices from both nonrenewable and renewable resources to produce composite materials that are competitive with synthetic composites requires special attention, i.e., biofiber–matrix interface and novel processing. Natural fiber–reinforced polypropylene composites have attained commercial attraction in automotive industries. Natural fiber—polypropylene or natural fiber—polyester composites are not sufficiently eco-friendly because of the petroleum-based source and the nonbiodegradable nature of the polymer matrix. Using natural fibers with polymers based on renewable resources will allow many environmental issues to be solved. By embedding biofibers with renewable resource–based biopolymers such as cellulosic plastics; polylactides; starch plastics; polyhydroxyalkanoates (bacterial polyesters); and soy-based plastics, the so-called green bio-composites are continuously being developed.     

Use of selected waste materials in concrete mixes

A modern lifestyle, alongside the advancement of technology has led to an increase in the amount and type of waste being generated, leading to a waste disposal crisis. This study tackles the problem of the waste that is generated from construction fields, such as demolished concrete, glass, and plastic. In order to dispose of or at least reduce the accumulation of certain kinds of waste, it has been suggested to reuse some of these waste materials to substitute a percentage of the primary materials used in the ordinary portland cement concrete (OPC). The waste materials considered to be recycled in this study consist of glass, plastics, and demolished concrete. Such recycling not only helps conserve natural resources, but also helps solve a growing waste disposal crisis. Ground plastics and glass were used to replace up to 20% of fine aggregates in concrete mixes, while crushed concrete was used to replace up to 20% of coarse aggregates. To evaluate these replacements on the properties of the OPC mixes, a number of laboratory tests were carried out. These tests included workability, unit weight, compressive strength, flexural strength, and indirect tensile strength (splitting). The main findings of this investigation revealed that the three types of waste materials could be reused successfully as partial substitutes for sand or coarse aggregates in concrete mixtures.     

Recycling of non-metallic fractions from waste electrical and electronic equipment (WEEE): A review

The world’s waste electrical and electronic equipment (WEEE) consumption has increased incredibly in recent decades, which have drawn much attention from the public. However, the major economic driving force for recycling of WEEE is the value of the metallic fractions (MFs). The non-metallic fractions (NMFs), which take up a large proportion of E-wastes, were treated by incineration or landfill in the past. NMFs from WEEE contain heavy metals, brominated flame retardant (BFRs) and other toxic and hazardous substances. Combustion as well as landfill may cause serious environmental problems. Therefore, research on resource reutilization and safe disposal of the NMFs from WEEE has a great significance from the viewpoint of environmental protection. Among the enormous variety of NMFs from WEEE, some of them are quite easy to recycle while others are difficult, such as plastics, glass and NMFs from waste printed circuit boards (WPCBs). In this paper, we mainly focus on the intractable NMFs from WEEE. Methods and technologies of recycling the two types of NMFs from WEEE, plastics, glass are reviewed in this paper. For WEEE plastics, the pyrolysis technology has the lowest energy consumption and the pyrolysis oil could be obtained, but the containing of BFRs makes the pyrolysis recycling process problematic. Supercritical fluids (SCF) and gasification technology have a potentially smaller environmental impact than pyrolysis process, but the energy consumption is higher. With regard to WEEE glass, lead removing is requisite before the reutilization of the cathode ray tube (CRT) funnel glass, and the recycling of liquid crystal display (LCD) glass is economically viable for the containing of precious metals (indium and tin). However, the environmental assessment of the recycling process is essential and important before the industrialized production stage. For example, noise and dust should be evaluated during the glass cutting process. This study could contribute significantly to understanding the recycling methods of NMFs from WEEE and serve as guidance for the future technology research and development.     

The origins of municipal solid waste: The relations between residues from packaging materials and food

Data for the composition of municipal solid waste (MSW) from around the world are used to further examine a previously reported statistical correlation between the fraction of food residues and the fractions of paper and board, metal, glass and plastics residues in MSW. For data from many locations, these correlations are statistically significant; multiple linear regressions are computed. The fraction of food waste decreases as the fractions of waste from paper and board, metals and glass increase.The situation in the U.S.A. is examined further for just packaging waste. Similar correlations are established for the fraction of food residues and the fractions of paper and board and plastics packaging residues for predicted compositions for 1980 to 2000. Similar correlations for the U.K. are not statistically significant. Some reasons for this are postulated.The results of the statistical analyses predict that a strategy for decreasing the fraction of food waste in MSW is to increase the use of food packaging by some amount, especially plastics and metals, contrary to conventional wisdom.     

环保型塑料产业进展

本文在持续跟踪环保型塑料产业动态的基础上,从原料开发、产品设计、废弃物回收利用等方面,综述了生物基和石油基环保型塑料产业的最新进展,旨在为塑料研发人员和相关产业工作者开拓思路。指出:环保型塑料是未来塑料产业发展的重要方向,非环保型塑料的市场份额将逐步被环保型塑料占据,最后稳定在较低的水平上。     

Waste plastics recycling process using coke ovens

The Japan Iron and Steel Federation (JISF), as its voluntary energy-saving action plan, proposed a 10% energy reduction by 2010 with 1990 as the basis. Further, it has suggested an additional 1.5% energy saving by the use of waste plastics as a metallurgical raw material. The amount of processing of waste plastics which corresponds to this amount of energy conversion is about 1 million t scale during 1 year. Conventional known methods for recycle-processing of waste plastics include, for example, the method of injection into a blast furnace to use waste plastics as an iron-ore reducing agent instead of coal. On the other hand, the coking process is considered to be suitable as a waste plastic recycling facility because the process involves coal carbonization in a high-temperature and reducing atmosphere. Carbonization tests with mixed waste plastics were conducted with laboratory equipment and in actual coke ovens. As a result, it was confirmed that the waste plastics recycling process using coke ovens is feasible. Therefore, a waste plastics recycling process using coke ovens was started as a chemical recycling technology at Nippon Steel.