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Apatite ore mine tailings as an amendment for remediation of a lead-contaminated shooting range soil 总被引:1,自引:0,他引:1
Venäläinen SH 《The Science of the total environment》2011,409(21):4628-4634
This study investigated the use of tailings from apatite ore beneficiation in the remediation of a heavily contaminated shooting range soil. The tailings originating in Siilinjärvi carbonatite complex, Finland, consist of apatite residues accompanied by phlogopite and calcite. In a pot experiment, organic top layer of a boreal forest soil predisposed to pellet-derived lead (Pb) was amended with tailings of various particle-sizes (Ø > 0.2 mm, Ø < 0.2 mm and unsieved material) differing in their mineralogical composition. After 9-, 10-, 14- and 21-month incubation, the samples were monitored for tailings-induced changes in the different Pb pools by means of sequential fractionation. Following the incubation, the samples were extracted with water and the extracts were analyzed for Pb species distribution by means of a cation exchange resin. The results revealed that Pb was continuously released from the shotgun pellet fragments due to weathering. However, the apatite and calcite compartments in the tailings counteracted the mobility of the released Pb through the formation of sparingly soluble fluorpyromorphite and cerussite. Furthermore, the tailings efficiently reduced the bioavailability of Pb by transferring it from the water-soluble and exchangeable pools into the organic one. The material also increased the proportion of the less toxic non-cationic Pb to the total dissolved Pb from the initial level of 5% to 9-12%. The results suggest that the tailings-induced stabilization of Pb may be an environmentally sound remediation technique at polluted sites. 相似文献
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钙镁磷肥发展前景综述 总被引:6,自引:2,他引:4
我国主要磷资源形成于距今6.5亿至5.5亿年前,1亿年内在扬子古海沉积了105亿t以中、低品位为主的胶磷矿。这类磷矿中的大多数含镁高,是制造钙镁磷肥的最佳原料。利用玻璃结构因子配料法可充分利用磷矿开采过程中废弃的低品位磷矿及顶板剥离层生产钙镁磷肥。并介绍中国的钙镁磷肥与日本、韩国熔成磷肥的生产现况及对比3国的售价,提出中国钙镁磷肥应与世界熔成磷肥的标准与价格接轨,有利于我国磷资源的合理利用。 相似文献
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支持用户界面自动生成的界面模型 总被引:27,自引:4,他引:27
为实现软件用户界面的工程设计,论文提出了一种支持用户界面自动生成的界面模型FMP。它利用功能模型(F)和对象模型(M)捕捉与界面相关的功能和数据信息,用交互模型(M)表达这些信息和控制关系。然后依据交互模型的描述,利用表示模型(P)建立内部对象和外部显示元素的对应关系,规划界面布局,从而指导实现用户界面的自动生成。 相似文献
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为满足某研究项目的需要,对我国原有在CHALLENGE工作站上运行的燃料管理程序系统FMP进行微机化改造,大幅提高了该程序系统的计算速度和程序可移植性。该程序系统中两个主要程序TPFAP-E和CFMP的计算结果与原程序计算结果的比较表明,程序系统的微机化改造非常成功。在此基础上,针对堆芯设计计算报告《秦山300 MWe核电厂堆芯第十次换料后续循环换料方案设计》的内容进行4个循环的燃料管理验证计算,主要参数计算结果与原报告的计算结果均吻合得较好,为利用该程序系统开展深入的燃料管理研究奠定了基础。 相似文献
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基于模型的用户界面代码自动生成 总被引:9,自引:1,他引:8
基于模型的用户界面开发环境(MB_UIDEs)旨在通过使用某种特定的方法给设计人员提供一种更加系统的用户界面开发途径。文章介绍的就是一个新的基于FMP模型的用户界面开发环境。文中主要介绍它的系统机构,代码生成模型,代码生成过程中所采用的技术和算法等。它能够自动地生成交互系统的源代码,当然也包括图形用户界面的源代码。 相似文献
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