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EGTA—EDTA直接滴定法测定水泥中的氧化镁 总被引：1，自引：0，他引：1
根据水泥的化学组成,利用ＥＧＴＡ与Ｃａ＾２＋、Ｍｇ＾２＋配位能力相差较大的特性提出了ＥＧＴＡ作为Ｃａ＾２＋的掩蔽剂,ＥＤＴＡ直接滴定镁的方法并讨论了Ｆｅ＾３＋、Ａｌ＾３＋、Ｔｉ＾４＋、Ｍｕ＾２＋等离子的干扰及消除。 相似文献
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Activities of FeO in CaO-SiO2-Al2O3-MgO-FeO slags were determined at 1673 K by electrochemical of the solid electrolyte cell： Mo [Mo＋MoOu[ZrO2（MgO）[Fe＋（CaO-SiO2-Al2O3-MgO-FeO）＋Ag[Fe. The influences of slag compositions and basicity on FeO activities were analyzed. The results reveal that, for slags of fixed （%CaO）/（%SiO2） ratio, MgO and Al2O3 content, there was an increase of FeO activities with increase of FeO content. For slags with constant {（%CaO）＋ （%MgO）}/（%SiO2） ratio, fixed FeO and A1203 content, FeO activities decreased when MgO content increased from 5% to 10%, and increased with the increase of MgO content when it was over 10%. The FeO activities increased when （%CaO）/（%SiO2） ratio changed from 1.03 to 1.30 in the slags of constant MgO, FeO and Al2O3 content. 相似文献
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本文阐述了煤的灰成分测定的方法及一些相关问题的研究,特别对煤灰中SiO2测定时一些注意问题进行了深入讨论。 相似文献
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A plane wave density functional theory method was used to investigate the adsorption properties of isolated alkali metal atoms, including Li, Na, K, Rb and Cs on-top of the F 0 s defective center of MgO(001) surface. Among all the alkali metals, the lithium atom binds most strongly with the highest adsorption energy of 0.67 eV and the shortest distance of about 0.257 nm between metal and the surface, the binding energy for the sodium atom comes second, and just half of this value for the other alkali metal ... 相似文献
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Activities of FeO in CaO-SiO2-Al2O3-MgO-FeO slags were determined at 1673 K by electrochemical measurements of the solid electrolyte cell: Mo |Mo MoO2[ZrO2(MgO)[Fe (CaO-SiO2-Al2O3-MgO-FeO) Ag|Fe. The influences of slag compositions and basicity on FeO activities were analyzed. The results reveal that, for slags of fixed (?O)/(%SiO2) ratio, MgO and Al2O3 content, there was an increase of FeO activities with increase of FeO content. For slags with constant {(?O) (%MgO)}/(%SiO2) ratio, fixed FeO and Al,2O3 content, FeO activities decreased when MgO content increased from 5% to 10%, and increased with the increase of MgO content when it was over 10%. The FeO activities increased when (?O)/(%SiO2) ratio changed from 1.03 to 1.30 in the slags of constant MgO, FeO and Al2O3 content. 相似文献
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应用格子Boltzmann方法对MgO颗粒CO2吸附过程流动与传输特性进行模拟。基于二级反应动力学模型,研究孔隙率和粒径对颗粒内渗流速度、CO2浓度、CO2吸附速率和MgO颗粒固体转化率的影响。结果表明：沿流动方向颗粒内CO2浓度与颗粒转化率逐渐递减;在相同时间下,颗粒粒径越大,颗粒内渗流速度和CO2浓度越低,转化率和吸附速率越低;相同粒径和相同时间下,孔隙率越大,CO2浓度和MgO固体转化率越高,平均吸附速率越快。 相似文献
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刘碧蕊 《宁夏师范学院学报》2012,33(3):45-49,65
采用共沉淀合成法,制备了纳米MgO:Eu3+发光材料.通过X射线衍射(XRD)、激发光谱和荧光发射光谱等手段,对所合成样品的相结构、发光特性等进行了表征,探讨了激发光波长对样品光致发光性能的影响.XRD表征结果显示,所合成的纳米MgO:Eu3+材料具有立方晶相结构,颗粒平均尺寸在50nm～60 nm.通过激发光谱和荧光发射光谱的测量,研究了纳米MgO:Eu3+发光材料在不同发射波长下的激发谱特性,以及不同激发波长激发时,样品的荧光发射特性,讨论了激发波长对MgO:Eu3+样品发光特性的影响. 相似文献
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A plane wave density functional theory method was used to investigate the adsorption properties of isolated alkali metal atoms, including Li, Na, K, Rb and Cs on-top of the F0s defective center of MgO(001) surface. Among all the alkali metals, the lithium atom binds most strongly with the highest adsorption energy of 0.67 eV and the shortest distance of about 0.257 nm between metal and the surface, the binding energy for the sodium atom comes second, and just half of this value for the other alkali metal atoms. The relatively strong interaction of Li with the F0s center can be explained by a more covalent bonding involved, evidenced by results of both the projected density of states and the projected charge density. The bonding mechanism is discussed in detail. 相似文献