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采用煤基直接还原-磁选工艺对某高铁锰矿进行铁-锰分离的试验研究。不配加添加剂时磁性产物铁品位为59.42%, 锰品位为20.73%; 非磁性产物锰品位为48.88%, 铁品位为5.91%。为强化铁-锰分离, 选择Na2CO3、Na2SO4和Na2S2O3作为添加剂进行还原试验, 结果表明3种添加剂在还原过程中都能促进铁-锰分离, 且Na2S2O3效果最优。在Na2S2O3用量为5%时, 磁性产物的铁品位提高至85.38%, 锰品位降低至9.08%; 非磁性产物的锰品位提高至54.72%, 铁品位降低至2.59%。研究了加入添加剂前后焙烧矿的微观结构和物相转变, 结果表明Na2S2O3有利于MnS和Mn2SiO4的形成并促进了铁晶粒的聚集长大。 相似文献
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建筑设计在建筑项目中有着非常关键的作用,建筑设计对工程建设经济效益的实现有着直接的影响,科学可行的建筑设计方案可以为建筑工程带来良好的社会效益和经济收益。本文以金大元·御珑宫廷项目为例,从建筑总体规划、建筑单体设计、防水设计、无障碍设计等方面论述了建筑设计的具体实施过程。 相似文献
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建筑·环境·文化--以环境和文化的观点考察乡土建筑保护 总被引:1,自引:0,他引:1
作为中国传统文化的重要组成部分,乡土建筑中蕴含大量的文化信息,尤其是广大的被忽略的普通村落.本文拟从乡土环境和乡土文化的角度对乡土建筑做一些探索,探究在乡土建筑的演变过程中乡土建筑与它所处的乡土环境和乡土文化之间的冲突.在此基础上笔者提出应该以发展的眼光来看待最广大的乡土建筑所起的变化,并合理的引导这种变化,达到乡土建筑与现代文化的真正融合. 相似文献
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Calcium ferrite formation characteristic during iron ore sintering with different oxygen atmospheres
It is generally known that the large formation amount of calcium ferrite is favorable for the iron ore sintering. The effects of sintering temperature and O2 content of inlet gas on the calcium ferrite formation characteristic of typical iron ores, including hematite, limonite, specularite and magnetite, were investigated. And the effect of O2 content on the microstructure of the roasted briquettes was also studied in detail. The results show the amount of calcium ferrite initially increases then decreases with the increase of the sintering temperature. The temperature of maximum calcium ferrite generation amount is determined as follows: for hematite and limonite it is 1275 ~C, whereas for specularite and magnetite, 1250℃. The maximum contents of calcium ferrite for hematite, limonite, specularite and magnetite under the optimal sintering temperature are 73%, 82%, 67% and 63%, respectively. Increasing O2 content of the airflow is advantageous to the formation of calcium ferrite. Relatively, the effect of O2 content on the calcium ferrite formation of magnetite is the most pronounced, while O2 content of inlet gas has little effect on the calcium ferrite formation of limonite. 相似文献
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