2011年我国废钢铁市场将持续健康运行

全面分析了2010年我国废钢铁市场的整体运行情况,在此基础上,对2011年我国废钢市场的供需及运行状况进行预测,指出2011年我国废钢市场将迎来良好发展机遇和诸多利好因素,并将持续健康发展,日本地震将给中国废钢铁进口及国内市场带来较大影响.     

废钢产业转型升级与废钢行业预测

随着我国经济社会的快速发展及城镇化水平的提高,作为基础材料的钢铁工业也随之快速发展。介绍了处于废钢产业前端的废钢采集供应、废钢铁应用企业、废钢加工设备制造业等由于钢铁工业的发展而加快转型升级,并对2011年废钢行情的总体趋势进行判断。     

给废钢铁应用加把“火”

循环使用废钢铁节能、环保,2009年1—9月,我国废钢进口总量为1119万t,远远超出2008年全年进口359万t的总量,并且恢复到2004年、2005年的历史最好水平。进口废钢的迅猛增长说明国内废钢市场逐渐回暖,但废钢真的"火"起来了吗?     

国内废钢铁市场触底上扬动态浅析

2010年7月中旬至8月中旬,中国废钢铁市场连续五周持续上扬。进口矿石的上扬、国际废钢市场的全面涨价、国际钢材市场的普遍回升及我国钢铁工业低利润格局的变化等,都是支撑我国废钢铁市场回升的内在动力。     

突破与引领 开启废钢铁产业发展新征程

2011年两家以废钢加工配送为主业的专业化金属再生资源公司双双跻身于中国企业500强,显现了我国废钢铁产业的成就和希望。指出创造一个具有中国特色的现代化废钢铁产业体系需要大企业骨干群体的创新和引领,打造大企业的着力点在于扩大规模、系统管理及承担社会责任,其动力核心在于突破和创新。     

2012年我国废钢铁将继续供不应求

概述了2011年我国废钢铁市场和进口废钢市场的运行情况,对我国废钢铁资源酌供需形势进行分析,预测了2012年我国废钢铁市场的发展趋势;并针对目前废钢铁市场供不应求的局面,提出几点建议。     

我国废钢铁市场的发展前景及废钢电子交易推荐标准

随着我国钢铁工业高速发展和国家对节能减排的高度重视,废钢铁资源的应用倍受业内关注。对我国废钢供需市场的规模、现状及发展前景进行分析和预测,并对我国废钢电子交易推荐标准进行详细介绍,指出作为大宗商品交易发展方向的电子交易模式,是我国废钢贸易的发展趋势,有利于废钢市场有序健康发展。     

首届中国废钢电子交易论坛举行中国将推出废钢价格指数

<正>由江阴市人民政府和中国东盟商品交易所联合主办,中国再生资源回收利用协会、中国废钢铁应用协会、中国拆船协会、中国物资再生协会、联合金属网共同协办的首届中国废钢电子交易论坛2010年1月17日在江苏江阴举行,南宁(中     

安徽省首条废钢铁破碎生产线在合肥投产再生资源回收利用迈向精细化

2011年12月26日，在合肥市南淝河滨河路皖中再生资源示范基地，安徽省第一条废钢铁破碎生产线顺利投产。 该生产线投资约1000多万元，年可回收处理废钢10万t。通过这条废钢铁破碎生产线，可以对废钢进行分拣、粉碎，将黑色金属、有色金属、非金属废物分离，使废钢纯净化，提高钢水质量，降低炼钢成本。而夹在非磁性物质中的铜、铝等有色金属挑选出来，又提高了回收效益。从难以处理的废钢铁，变成可为钢厂直接使用的优质炼钢原料，该生产线的投产标志着安徽省再生资源回收利用迈上新台阶，由低水平、粗放型生产，逐步向精细化、深加工方向发展。     

经济转型中的中国废钢铁投资市场

废钢铁产业是我国再生资源产业的主体,其节能减排、低碳环保和不可替代的钢铁原料功效十分显著。阐述了我国废钢铁产业在经济转型中的主导地位、应用价值、投资环境及今后的发展战略。指出我国经济发展方式的转变,赋予了废钢铁产业良好的发展机遇和重大的历史使命,中国废钢产业具有良好的投资市场和巨大的发展空间。     

Pyrolysis of virgin and waste polypropylene and its mixtures with waste polyethylene and polystyrene

A comparison of waste and virgin polypropylene (PP) plastics under slow pyrolysis conditions is presented. Moreover, mixtures of waste PP with wastes of polyethylene (PE) and polystyrene (PS) were pyrolyzed under the same operating conditions. Not only the impact of waste on degradation products but also impacts of the variations in the mixing ratio were investigated. The thermogravimetric weight loss curves and their derivatives of virgin and waste PP showed differences due to the impurities which are dirt and food residues. The liquid yield distribution concerning the aliphatic, mono-aromatic and poly-aromatic compounds varies as the ratio of PP waste increases in the waste plastic mixtures. In addition to this, the alkene/alkane ratio of gas products shows variations depending on the mixing ratio of wastes.     

北京市居民衣服消费处置及对其回收利用认识调查与分析

首先对北京市居民每年购买新衣服的数量、支出、穿着时间、淘汰原因,以及闲置衣服的处理方式、数量等进行了调查与分析,然后对北京市居民对旧衣物回收利用的认识、回收形式及其处理方式,对旧衣物如何处理回收、再利用的担忧,对希望旧衣物回收箱摆放的场所等进行了调查与分析。其研究结果对废旧纺织品回收体系建设、制度及政策制定具有一定的参考价值。     

Photo-oxidation and Photo-toxicity of Crude and Refined Oils

The fate and effects of an oil spill are effected by solar radiation through the action of photo-oxidation and photo-toxicity. Photo-oxidation, an important process in the weathering of oil, produces a variety of oxidized compounds, including aliphatic and aromatic ketones, aldehydes, carboxylic acids, fatty acids, esters, epoxides, sulfoxides, sulfones, phenols, anhydrides, quinones and aliphatic and aromatic alcohols. Some of these compounds contribute to the marine biota toxicity observed after an oil spill. Photo-toxicity occurs when uptake of certain petroleum compounds, e.g. certain polycyclic aromatic hydrocarbons and benzothiophenes, is followed by solar exposure which results in much greater toxicity than after dark uptake. The mechanism of PAH photo-toxicity includes absorbance of solar radiation by the PAH which produces a free radical and this free radical in turn reacts with oxygen to produce reactive oxygen species that can damage DNA and other cellular macromolecules. While most studies on photo-toxicity have been carried out in the laboratory, there are studies showing that water from an oil spill is photo-toxic to bivalve embryos for at least a few days after the spill. Other studies have found that oil contaminated sediments are photo-toxic to several marine invertebrates. More studies are required to determine if marine fauna at an oil spill site are effected by the action of photo-toxicity and photo-oxidation.     

Synthesis and Characterization of Polyols and Polyurethane Foams from PET Waste and Crude Glycerol

In this study, polyethylene terephthalate (PET) waste from post-consumer soft-drink bottles and crude glycerol from the biodiesel industry were used for the preparation of polyols and polyurethane foams. PET waste was firstly depolymerized by the glycolysis of diethylene glycol. The glycolyzed PET oligomers were then reacted with crude glycerol at different weight ratios to produce polyols via a series of reactions, such as esterification, transesterification, condensation, and polycondensation. The polyols were characterized by titration, viscometry, gel permeation chromatography (GPC), and differential scanning calorimetry. Subsequently, polyurethane (PU) foams were made via the reaction between the produced polyols and polymeric methylene-4,4′-diphenyl diisocyanate and were characterized by mechanical testing, scanning electron microscopy, and thermogravimetric analysis. Polyols from crude glycerol and their PU foams were also prepared to compare properties with those of polyols and PU foams from PET and crude glycerol. The influence of aromatic segments existing in glycolyzed PET and glycerol content on the properties of the polyols and PU foams was investigated. It was found that aromatic segments of polyols from glycolyzed PET helped increase their molecular weights and improve thermal stability of PU foams, while high glycerol content in polyols increased the hydroxyl number of polyols and the density and compressive strength of PU foams.     

电厂建设运行中的水土流失预测与水土保持设计

在燃煤电厂建设运行的同时,将引起一系列的水土流失问题.以四川国电金堂电厂二期扩建工程为例,简要说明项目区水土流失预测的内容和方法,并在其基础上对可能产生的水土流失和危害进行了分析,同时介绍了建设期和运行期采取的综合防治措施,为类似工程的水土保持提供借鉴.     

磷对环境的污染及防治对策

我国水体富营养化严重，其主要控制因子是磷。在分析磷污染的污染状况，污染源的基础上，介绍了防治对策，采用低磷循环冷却水处理剂，减少磷排放，是防止工业磷污染的有效方法。     

Novel and innovative pyrolysis and gasification technologies for energy efficient and environmentally sound MSW disposal

Within the context of European Union (EU) energy policy and sustainibility in waste management, recent EU regulations demand energy efficient and environmentally sound disposal methods of Municipal Solid Waste (MSW). Currently, landfill with its many drawbacks is the preferred option in the EU and many other industrialised countries. Within the waste management hierarchy thermal disposal especially incineration is a viable and proven alternative. But, the dominating method, mass-burn grate incineration has drawbacks as well particularly hazardous emissions and harmful process residues. In recent years, pyrolysis and gasification technologies have emerged to address these issues and improve the energy output. To keep the many players in the field comprehensively informed and up-to-date, novel and innovative technology approaches emphasising European developments are reviewed.     

微生物絮凝剂及其在水处理中的应用

近年来对微生物絮凝剂的研究不断深入，新的高效菌种不断被发现。简要介绍了微生物絮凝剂的絮凝机理、分关、絮凝效果及影响因素，重点介绍了新型微生物絮凝剂在水处理中的应用。     

Laboratory Experiments and Estimation of Cumulative Infiltration and Sorptivity

Soil water cumulative infiltration affects the environment by controlling the irrigation rate and consequently the water and pollutants movement through the ground. In order to study the cumulative infiltration in a sandy soil sample, experiments were performed in the laboratory. The sample was placed uniformly in a transparent column with an inner diameter of 6 cm. A constant head boundary condition of a 2 mm height was applied on the surface of the sample and the cumulative volume of the incoming water was measured. Soil moisture at four locations of the column was measured, by using the TDR method in order to obtain the moisture profiles. By comparing the values of the infiltrated water volumes with those calculated by the integration of the moisture profiles, a good agreement was found out. Also the Parlange theoretical model fitted very well with the infiltration experimental points.