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为了节省能源,改进水泥熟料的烧成方法,本文研究了快速升温煅烧(快速煅烧)与仿回转窑煅烧(普通煅烧)。并从动力学角度比较这两种方法的优劣。结果表明快速煅烧法的熟料形成活化能大大低于普通煅烧法。为了探讨其原因,将水泥熟料的主要原料石灰石进行同样方式的煅烧,分析其产物石灰的结构,发现快速煅烧与普通煅烧相比产生的石灰,晶体结构松散,晶格常数大,晶格缺陷多,石灰的颗粒微细,反应活性大,故而熟料的形成活化能低。 相似文献
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将水泥样置于水中,加少许HNO_3使其溶解后过滤,用阳离子交换树脂除去滤液中的干扰离子,调整PH使其达6~7,再加入乙醇丙酮,以铅电极为指示电极,用0.01Mpb(NO_3)_2溶液进行电位滴定。本方法快速、准确、精密度高,与重量分析相比,节省时间4倍;与离子交换法相比,准确度与精密度都较高。 相似文献
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本文用正电子湮没和电子顺磁共振相结合的方法对施主掺杂BaTiO_3陶瓷的缺陷进行了研究。正电子湮没寿命测量说明与Ba/Ti=1的样品相比Ba过量或Ti过量都会引起材料中的空位增加。顺磁共振图谱表明,g=1.997峰的强度在铁电相变为顺电相后,强度有很大的增长(约20倍)。该峰强度随Ba/Ti的变化与正电子捕获率随Ba/Ti的变化相同。因此该峰是由阳离子空位(V_(Ba)和V_(Ti))引起的。它实质上是由O~-产生的,随施主掺量的增加g=1.997峰急剧增强,这很可能是由于施主增加引起V_(Ti)大量生成的缘故。 相似文献
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前言离子选择性电极是一种用于进行离子活度电位法测定的指示电极,它对溶液中某一特定离子具有选择性的响应。在硅酸盐材料分析方面,我们继采用PNa玻璃电极及pvc膜钾电极测定水泥、玻璃、陶瓷中的Na_2O、K_2O之后,又进行了用氟电极测定水泥及其原料中SiO_2含量的研究。是一种简便、快速、精度较高的测定SiO_2含量的方法。 相似文献
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In this paper for saving energy two differentburning methods of cement clinker formation havebeen studied.One is the rapid burning method andthe other is ordinary burning method simulatingrotary kiln,and they are compared by the kineticpoint of view.The result reveals that theactivation energy of rapid burning is much lowerthan ordinary burning.For looking into the cause,the main raw material—lime stone was burnt bythe same two methods and the structure of productCaO has been detected.It can be found that themicrostructure of CaO produced by rapidburning is looser;lattices constants aregreater;crystal defects are more and particlesize is smaller than that produced by ordinaryburning.These cause the chemical reaction moreactive.So the activation energy of clinkerformation of rapid burning is much lower thanthat of the ordinary burning. 相似文献
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水泥熟料中游离氧化钙测定方法的研究 总被引:1,自引:1,他引:0
用热的乙二醇萃取波特兰水泥与水泥熟料中的游离氧化钙,整个测定可于30分钟内完成。此方法的准确度与甘油—酒精法相同,且有简单、快速的优点。 相似文献
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The photochromic properties of photochromicglasses containing both copper halides and cadmiumhalides depend mainly upon the body glass composi-tion. The composition range of glass matrix can bedescribed by F=[(R_20+MO)-Al_20_3]/B_20_3·In this paper,the basic structure of the glasses is investigatedin terms of IR and Raman spectroscopy in detail.The results demonstrate that the network of bodyglass is constructed by [SiO_4], [BO_3], [BO_4] and[Al0_4], in which [BO_3] and [BO_4] are interconnec-ted into two kinds of borate groups and a kind ofboroxol ring. Finally, the relationships betweenstructure and properties have been discussed on thescale of molecules and molecular groups. 相似文献