半干法循环流化床脱硫副产物的综合利用

随着钢厂和燃煤电厂的大规模建设,控制钢厂及电厂SO2的排放已成为降低中国SO2排放总量的重要措施,随之而产生的大量脱硫灰的综合利用亦成为亟待解决的问题。介绍了脱硫灰的形成及其特性,并对目前国内外循环流化床烧结脱硫灰及电厂脱硫灰的利用现状进行分析,提出了烧结脱硫灰可用作水泥生产助磨剂和水泥缓凝剂及制备生态型水泥的全新利用方式,从而实现脱硫灰变废为宝。     

改良A2/O工艺在城市污水中的应用

针对石家庄市桥西污水处理厂二期工程采用的改良A2/O工艺的3种不同工况,并结合该厂污水处理工艺流程和实际运行情况进行了论述。运行结果表明:改良A2/O处理效果稳定,除磷脱氮效果明显,适宜应用于大型污水处理厂,经过二级处理,出水能够达到排放标准,三级处理后可作为中水回用。     

安徽省两淮煤矿区主要环境问题及其整治对策

探讨了安徽两淮煤矿区煤矸石,粉煤灰,矿井瓦斯及燃煤电厂引起的环境问题及一般的治理方法,并且运用系统生态学和循环经济的理论提出了煤炭资源的永续有效利用和建设生态矿区的观点,从而实现经济和社会的可持续发展。     

明清广东山区灰粪和平原泥肥应用的历史演变

传统农业时代广东地区山区和平原分别以获取灰粪和泥肥作为主要肥源.山区制作灰粪的方法有烧畲作灰、樵采制灰、采集草皮泥制作厩肥等,却是山区植被减少、水土流失加剧的一个原因.珠三角平原则以潮灌和上泥获得珠江河道上沉积的泥肥,是维护当地水环境的生态技术措施.而过度依赖天然肥源都限制了多熟种植的发展和造成了地力的下降,造成粮食产量的减少.     

Accessing capital markets: Aristocrats and new share issues in the British bicycle boom of the 1890s

The article reconsiders the mid-1890s boom in which a large number of firms in the bicycle, pneumatic tyre and related industries were floated. It investigates why so many of these issues featured aristocratic directors in their prospectuses and finds that they represented social connections that were a necessary condition for regional industrial firms to gain a London listing. The case shows that the role and value of these directors was to access capital markets and financial resources, as opposed to a temporary aberration designed to inflate share prices and mislead investors.     

Quota removal and firm-level offshoring: Theory and evidence

Recent literature indicates that offshoring can effectively increase firm productivity and improve product quality. Therefore, global value chains have increased in importance. In this paper, we investigate the impact of export growth on firm-level offshoring. Removal of the quota on textile and clothing products in importing countries boosts China's exports of quota-restricted products. This removal offers a quasi-natural experiment. Using a difference-in-differences approach, we find that export growth induced by the quota removal increases the extensive and intensive margins of firm-level offshoring. The impact is more pronounced on domestic firms and firms that are engaged in ordinary trade. Our findings suggest additional gains from trade liberalization: trade liberalization not only boosts exports, but also enhances firm productivity and product quality through encouraging firm-level offshoring.     

钢渣和改性粉煤灰处理含铬废水的研究

研究了钢渣和改性粉煤灰对六价铬离子的去除效果。研究结果表明,钢渣对六价铬离子的去除效果不是很好。用氢氧化钙对粉煤灰进行高温活化后对六价铬有良好的去除效果。改性粉煤灰对六价铬的去除效果受粉煤灰的加入量、温度、振荡速度和废水初始pH值的影响。应考虑改性粉煤灰在工业上的推广应用。     

浅析影响焦炭质量的几点因素

本文通过对焦炭化学成分、焦炭显微结构、焦炭灰分等几方面进行分析,从而提高焦炭质量。     

电容层析成像在双套管气力输送中的应用

以某公司双套管密相输送系统为试验平台,用电容层析成像技术对粉煤灰为输送物料进行了相关物理参数的测量研究。研制了适用于高压力下的8加4电极的电容层析成像传感器并进行了试验台的搭建安装。采用电容层析成像技术(ECT),对常温下气力输送的固体浓度、速度和质量流量进行了测试研究。研究结果证明电容层析成像技术在工业中的现实可行性。     

利用粉煤灰制备多孔陶瓷砖的工艺研究

本文介绍了以粉煤灰为成孔基础材料、普通粘土为集料,瓷粉为骨料,淀粉为造孔剂,加入少量粘结剂,调成含水率为34%的泥浆,采用传统注浆成型工艺成型坯体,并在1100℃下烧成显气孔率为37.68%,容重为1.41g/cm3的多孔陶瓷砖。经过XRD和SEM测试,得知该砖的主晶相为3Ca O·Al2O3·2Si O2,其气孔大小在几十到上百微米。这一方法既实现了固体废物的资源化,又降低了陶瓷制备的能源消耗,同时制备工艺简单易行,具有良好的社会效益和经济效益。