共查询到20条相似文献,搜索用时 93 毫秒
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FENG Changgen ZHUO Xiaoxi LIU Xia 《中国稀土学报(英文版)》2009,27(5):717-722
A series of photocatalysts, K11[Ln(PW11O39)2]/PVA (Ln=La, Ce, Pr, Nd, Sm) were prepared by K11[Ln(PW11O39)2] (Ln=La, Ce, Pr,Nd, Sm) containing five kinds of lanthanides and polyvinyl alcohol as the support. The catalysts obtained were characterized by Fourier trans-form infrared spectra, UV-vis spectra, powder X-ray diffraction, and scanning electron microscopy, indicating that the structure of K11[Ln(PW11O39)2] and polyvinyl alcohol remained intact, respectively. The photocatalysts exhibited efficient catalytic activity to degrade methyl orange, Congo Red, Ponceau 2R. The maximal degradation conversions of the three kinds of dyes were 99.58%, 47.61%, 72.42%, respectively. 相似文献
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在香港校园里,常常有这么一群特殊的人,她们每天早早地来到学校,为学生测量体温,观摩学校早会,协助管理图书,课余为学生讲故事,中午帮学生盛饭,甚至为学校编辑刊物,放学为低年级学生辅导作业……俨然是学校的正式教师,其实是学生家长,她们为学校,帮老师做了很多事情,都是义务的,没有任何报酬,在香港,通常把她们称之为“家长义工”。 相似文献
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业绩略低于预期第三季度公司实现营业收入1471394万元,同比上涨30.67%,净利润91950万元,同比下降26.9%,每股收益0.30元,前三季度实现营业收入4154476万元,同比上涨45.46%,净利润369876万元,同比增长13.76%,每股收益1.22元,业绩略低于市场的普遍预期。 相似文献
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提出了用火焰原子吸收光谱法测定金锭中Cu,Ag,Fe,Pb,Bi,Sb的方法。用乙酸乙脂萃取分离金,水相浓缩后测定6种待测元素,方法的检出限:Cu,Ag,Fe为0.021mg/L,Pb,Bi,Sb为0.24mg/L;回收率94%~106%;RSD小于10.6%。该方法快速、简便,样品用量少,测定结果与ICP AES法和国家标准方法一致。 相似文献
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型铁中Si,Mn,P,S四大元素的测定是型铁质量评价的主要内容。以往化学法分析Si,Mn,P,S四大元素,劳动强度大,工序繁琐,偶然误差因素多,分析周期长,准确度低。近年来,X射线荧光光谱仪在冶金、地矿、水泥等分析应用方面,得到迅速发展,它具有自动化程度高,操作简单、快速、准确、非破坏性等优点,本文应用3530荧光光谱仪,分析型铁中的Si,Mn,P,S四大元素,取得了成功,方法简单、准确、快速。1实验部分1.1仪器和试剂3530X射线荧光光谱仪(日本理学),Rh靶,端窗X射线管;PR—10气体;… 相似文献
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浮选过程泡沫图像特征识别研究 总被引:2,自引:0,他引:2
在浮选过程中,通过观测矿浆泡沫状态来判断药剂添加量的程度。运用图像检测方法,提取矿浆中泡沫图像特征,获取浮选过程加药量的程度,实现加药量进行调节,浮选过程加药量的自动控制提供条件。 相似文献
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R. Herrera Urbina 《Mineral Processing and Extractive Metallurgy Review》2013,34(2):139-182
Over the last two decades, significant advances have been made in the field of chemical reagents used in froth flotation, a solids separation technique whose success depends on the use of a wide variety of both inorganic and organic reagents, including polymers, for controlling the wetting behavior of solid surfaces, particle dispersion or aggregation, and bubble stability. Novel discoveries include new chemistries of reagents, especially collectors, depressants and frothers, new blends of known chemical compounds, new applications of known reagents, and the development of scientific methodologies for reagents design and testing of potential formulations. Even though the most important application of froth flotation has been the processing of raw materials, in recent years new applications of flotation continue to grow. Depletion of easy-to-process, high-grade ores and an increasing demand for clean technologies require new flotation reagents, that are environmentally friendly, more versatile, and economic. This article reviews recent developments of new chemistries for froth flotation, some of which are now available as commercial products, and their applications. 相似文献
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消除矿泥对汤丹难选氧化铜矿浮选影响的研究进展 总被引:10,自引:0,他引:10
基于汤丹矿泥的组成和浮选特性针对矿泥对汤丹难选氧化铜矿的影响进行了长时间的试验研究,主要是通过寻找新的浮选药剂及符合新药剂特性的浮选工艺,使浮选指标获得了改善。 相似文献
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浮选分离药剂选择是萤石选矿的重点和难点之一. 总结萤石浮选的捕收剂和调整剂的种类、作用机理及使用现状,清洁、高效捕收剂和选择性强抑制剂是萤石浮选药剂的优选;重点介绍低温浮选捕收剂的研究现状及其在萤石浮选中的优势;组合药剂和新型浮选药剂的开发,性能及作用机理的研究仍然是今后研究的主要方向. 相似文献
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