共查询到19条相似文献,搜索用时 187 毫秒
1.
2.
3.
4.
5.
6.
7.
塑料的回收利用是近些年来再生资源研究的一个非常重要的方向。废旧塑料,尤其是消费后的废旧塑料是回收利用的重点。本文从回收方法和途径阐述了有关废旧塑料各类最新的塑料循环周期模型,进而说明积极的研究废旧塑料循环利用的新方法、新工艺具有十分重要的意义。 相似文献
8.
低碳经济驱动废旧塑料回收再生大市场 总被引:1,自引:0,他引:1
在污染日益严重的今天,废旧塑料造成的白色污染受到人们的广泛关注,因而废旧塑料回收也成了时下非常热门的话题。根据废旧塑料回收再生的紧迫性,本文阐述了废旧塑料的节能环保循环利用,欧美各国旧塑料的回收再生动态和“以旧换新”有利于塑料的节能环保循环利用,以及汽车市场火爆由此车用废塑料处理难题显现及对应措施,同时指出了塑料再生利用存在的瓶颈、对策及塑料资源回收利用任重道远。 相似文献
9.
10.
11.
随着塑料使用量的大增,废旧塑料己造成了严重的环境污染,同时又蕴含着重要的再生资源。石油和煤不可再生,资源紧缺,从节约地球资源和保护地球环境的角度考虑,目前各国对废旧塑料回收都非常重视,投入大量人力、物力乃至立法,开发各种废旧塑料回收利用的关键技术.废旧塑料回收方法主要有熔融再生,热裂解,能量回收,回收化工原料及其它。主要用途以及技术研究方向有制造燃油、生产防水抗冻胶、制取芳香族化合物、制备多功能树脂胶、防火装饰板、再生颗粒、生产克漏王、制备环保漆、沥青改性材料、流化床气化。相应的设备研制还未跟上。 相似文献
12.
The recycling of plastic waste is of particular interest in large urban areas where municipal waste represents a large ecological problem. To achieve their objective (consumer products from plastic waste), formulators of a recycling program have to understand the implications of working with mixtures of different resins. Furthermore, in a multiphase system, the thermomechanical history experienced by the resins during processing represents an important link between operating conditions, resin properties, and final product performance. High-density polyethylene/low-density polyethylene (HDPE/LDPE) blends (10, 20, 35, 50, 65, 80, and 90 percent by weight HDPE) were melt blended in an internal mixer. A complete rheological characterization was performed on each blend. The resulting blends were extruded under different processing conditions. The extruded sheets were further characterized to determine their mechanical properties, The experimental results show important differences in the mechanical properties (transverse and longitudinal) of the sheets obtained from the blends. These differences are explained on the basis of the processing conditions (thermomechanical history) and the rheological properties of the molten blends. 相似文献
13.
随着锂电池市场需求的不断扩大,锂资源的提取与回收成为研究的热点。介绍了盐湖卤水提锂工艺中沉淀法和萃取法的研究进展。重点阐述了废旧锂离子电池正极材料回收锂资源的研究现状。介绍了金属锂的制备工艺,包括熔盐电解法和真空热还原法,其中真空热还原法包括硅热还原法、铝热还原法和铁热还原法。目前盐湖卤水萃取法提锂的工业化是需要解决的重点问题;废旧锂离子电池锂资源的绿色回收是当前研究的热点,在保证锂回收效率的同时尽量选用有机酸以减少污染,同时废旧锂离子电池的工业化回收前景广阔;真空热还原制备锂单质目前仍处于实验室研究阶段,连续化生产是研究的主要方向。 相似文献
14.
总结了废旧线路板中塑料的回收处置方法和废旧线路板中塑料的回收利用现状。重点介绍了废旧线路板中塑料的物理回收法、热解回收法和溶液回收法,在综合比较废旧线路板中塑料回收利用的各种方法的基础上展望了废旧线路板中塑料回收利用的发展趋势。 相似文献
15.
16.
利用真空干燥原理,以双螺杆挤出机产生的废热为热源,采用单螺旋混合干燥机在真空状态下混合烘干物料.实践表明,该真空混合烘干技术节能效果明显,可满足物料的干燥技术要求,尤其适用于热敏性塑料的干燥. 相似文献
17.
18.
The possibility of producing wood‐plastic panels using a melt blend/hot press method was studied in this research. The studied panels were compared with conventional medium density fiberboard (MDF) and particleboard (PB) panels. Wood‐plastic panels were made from high density polyethylene (as resin) and MDF waste and PB waste (as natural fiber) at 60, 70, and 80% by weight fiber loadings. Nominal density and dimensions of the panels were 1 g/cm3 and 35 × 35 × 1 cm3, respectively. Mechanical properties of the panels including flexural modulus, flexural strength, screw and nail withdrawal resistances, and impact strength were studied. Results indicated that the mechanical properties of the composites were strongly affected by the proportion of the wood flour and polymer. Maximum values of flexural modulus of wood plastic panels were reached at 70% fiber content. Flexural strength, screw and nail withdrawal resistance, and impact strength of wood plastic composites declined with the increase in fiber content from 60 to 80%. This was attributed to the lack of compatibility between the phases. The produced panels outperformed conventional PB panels regarding their mechanical properties, which were acceptable when compared with MDF panels as well. The best feature in the produced panels was their screw withdrawal resistance, which is extremely important for screw joints in cabinet making. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers 相似文献
19.
人类生产生活对塑料制品日益增长的需求使得塑料废弃物迅速增加,由此引起的环境问题和社会问题亟待解决。本文综述了碳中和背景下国内外废塑料裂解法回收进展,从废塑料裂解催化剂、废塑料裂解反应器、废塑料与其他固废共裂解三个方面对废塑料裂解技术进展进行总结,归纳了国内外塑料回收企业和石油石化企业在废塑料裂解回收方面的进展,分为裂解法制油和裂解法制化学品两个方面。阐明了废塑料回收在节约能源、碳减排和经济性方面的意义,指出国内废塑料裂解法回收存在法规缺失、废塑料分类不清晰、产业链条不完善、相关学术研究不深入等问题,提出国内石油石化企业应从全生命周期角度出发对废塑料进行裂解法回收处理,结合上下游产业链,分阶段实施废塑料裂解产油品路线和产化学品路线。 相似文献