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探讨了将铁尾矿砂作为制备保温隔热复合材料原料的可行性,其核心技术是先将铁尾矿砂微纳米化,再掺混SiO2气凝胶并添加少量粘合剂和玻璃纤维等制成性能优良的微纳孔保温隔热材料。通过正交试验得到保温性能最优状态下的各因素配方;研究了微纳米化对基体材料性能的改善状况及不同掺量气凝胶对基体材料性能的影响;通过扫描电镜观察了复合材料内部各成分在基质中的存在状态,微观结构显示气凝胶形态保持完好。 相似文献
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Web2.0互联网时代里即便是没有自己搭建个人网站或者个人博客,至少也都有在各大门户网站注册使用博客这样的个人空间服务吧。在博客网站注册一个帐号,拥有一个属于自己的博客十分容易;利用网络上各式各样的免费网站源代码,搭建出一个个人网站也并非难事。但是,要设计一个个性、 相似文献
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This study investigated the effects of sampling conditions on composition of VOCs including different flow restrictors, SUMMA volumes, sampling heights and wind speed. Results showed that under the six sampling heights, the concentrations of main species of VOCs were slightly different, while wind speed has a greater impact on the content of VOCs source profiles. With the increase in wind speed, the weighted percentage of high-carbon aromatic hydrocarbons was higher. In addition, there were an extremely different profile between the normal production and shutdown conditions of delayed coking unit. In order to compare the emission characteristics of VOCs in process units from S and C refineries, the samples were collected in catalytic cracking unit, continuous catalytic reforming unit, and delayed coking unit. C3-C5 alkanes and low-carbon aromatic hydrocarbons were the main components in continuous catalytic reforming unit, about 67.1% and 34.9%, respectively. For delayed coking unit, the total content of high carbon alkane C6-C12 was significantly higher than other units, about 30.5% and 24.4%, respectively. The weighted percentage of C2-C5 low-carbon alkane were abundant, and propylene was higher in catalytic cracking unit. The emission characteristics obtained were consistent with the processing technology of production units. The results indicated that the source profiles from the same production unit in different refineries have similarities, but there were also significant differences. The emission characteristics of VOCs in the device could provide data support for source apportionment work in the production units. 相似文献
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