共查询到20条相似文献,搜索用时 54 毫秒
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1前言山东省平邑万寿宫水泥有限公司原采用熟料作晶种进行配料,但生产的熟料质量并不理想,28d抗折抗压强度分别在8.2MPa、55MPa左右,fCaO含量在3.0%左右。且立窑操作中边部毗火现象严重,不能全风操作,中心底火拉得太深,窑中心还原气氛严重,造成熟料粉化,进而导致水泥强度低,安定性不良。1995年10月笔者到该公司挂职后针对这一情况,提出了利用电厂炉渣代替熟料晶种配料的设想。1996年3月首先在二公司东线opmXtim机立窑上试用,获得了令人满意的效果。1996年7月又在公司其余3台生产线上使用。使用炉渣配料后熟料产、质量提高… 相似文献
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用低品位石灰石生产低碱水泥 总被引:1,自引:0,他引:1
0引言使用含碱量较高的水泥施工构筑混凝土,有时会产生混凝土碱集料反应,严重影响工程的耐久性,以致造成不可修复的破坏。水泥中碱的来源主要是各种原料和燃料中的含钾和钠的矿物,我厂粘土碱含量约占3%-5%,给生产制造低碱水泥带来很大困难。1用低品位石灰石烧制低碱熟料生产低碱水泥开始时的思路是想在本地寻找一种低碱风化砂岩矿石来代替粘土,以期减少由粘土带入的碱,但先后跑了多处矿点,终因其碱高而无法采用。后来在整理统计我集团出厂水泥碱含量时发现二分厂的水泥碱含量较低,多在1.0%左右,故又进一步分析了各窑熟… 相似文献
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平凉祁连山水泥有限公司2 500t/d新型干法熟料水泥生产线于2005年3月点火投产,投产之初设定熟料的配料方案是KH:0.900;SM:2.70;SM:1.50,但从半年多的运行状况来看,由于石灰石中MgO含量高,存在生料、熟料中MgO含量高,水泥窑烧成带煅烧温度低,物料煅烧范围窄,熟料产量低,熟料强度低的状况。 相似文献
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按照结晶学理论,析晶包含晶核形成和晶体长大两个过程,晶核的形成过程是析晶的第一步,也是品种煅烧技术的理论基础,本文将首先从热力学角度分析均匀成核和非均匀成核两种成核机理,然后进一步探讨晶种煅烧水泥熟料的原理及技术问题。 相似文献
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“添加晶种水泥立窑煅烧技术”已在全国各地广泛实施。在晶种技术的实际应用中,许多厂家所持观点有很大差异。有的厂家认为,在配料中掺加熟料晶种后,窑上操作难度相对加大,对提高熟料产质量效果不明显。具体地说,有时出现立窑操作中边部吡火现象严重,不能全风操作,中心底火拉得太深,窑中心还原氛严重,造成熟料粉化,导致水泥熟料强度下降。其次需挑选优质熟料返回生料配料,这样熟料重复返回,花工多,重复劳动,造成浪费,成本高,而市场竞争激烈,必须降低成本。另外,由于晶种的掺量较小,对生料粉的均化要求较高,晶种遇水后又会水化凝结,因此晶种配料的生料不能存放太久。 相似文献
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1.引言 晶种技术是一项节能增产的新技术,在立窑熟料的煅烧过程中加入晶种,能促进熟料的矿物形成,改善熟料质量。本文结合我厂的生产实践,就立窑采用晶种技术,提高熟料的易磨性,从而达到提高水泥磨产量作一个粗浅的分析。 相似文献
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内蒙古乌兰水泥集团现拥有三条2500t/d干法熟料生产线,第四条5000t/d干法熟料生产线正在安装、调试阶段,随着第四条生产线的投产,原料石灰石的贮量成了大问题,为此,我公司研究用电石渣代替部分石灰石,并寻求新的配料方案。 相似文献
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晶种煅烧水泥熟料机理初探 总被引:2,自引:0,他引:2
晶种煅烧水泥熟料机理初探王善拔广州市建筑材料工业研究所(510030)王宁章广西大学工程技术学院(537000)1引言掺晶种煅烧水泥熟料已在不少水泥厂特别是立窑水泥厂的熟料煅烧中取得较好的经济效果。据报导,掺入3%~5%的晶种后,熟料产量提高10%左... 相似文献
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Seed crystals isolated from Ivory Coast cocoa butter were shown to differ in chemical and thermal characteristics from solidified
Ivory Coast butter. Higher concentrations of complex lipids in the seed crystals have led to speculation on the role these
polar molecules play in lipid crystallization events. Phospholipids separated from lipid seed crystal isolates were twelve-fold
more concentrated than the original cocoa butter. Seed crystals contained 3.99% phospholipids while cocoa butter samples contained
0.34%. Phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, lysophosphatidylcholine,
phosphatidylserine, and phosphatidic acid were identified in cocoa butter with phosphatidylcholine (37.7%), phosphatidylglycerol
(27.3%) and phosphatidyl-ethanolamine (15.6%) being the major phospholipid constituents. Two phospholipids not previously
reported in cocoa butter were identified as phosphatidylglycerol and diphosphatidylglycerol based on co-migration of standards.
Cocoa butter and its seed crystals contained the same phospholipid entities; however, individual phospholipids differed significantly
in concentration. Phosphatidylethanolamine (30.4%) and phosphatidylcholine (30.2%) were the major phospholipids in seed crystal
samples. Fatty acid composition of cocoa butter and seed crystal phospholipids were found to be similar, with the exception
of myristic, stearic and oleic acids. Myristic acid was three-fold higher in phosphatidylglycerol and phosphatidylethanolamine
in the seed crystals, whereas stearic acid was significantly lower in the seed crystals when compared to the cocoa butter.
Concentrations of oleic acid were twice as high in seed crystal phosphatidylethanol-amine and almost four times as high in
seed crystal phosphatidylcholine than in corresponding cocoa butter samples. The possible role phospholipids play in seed
crystal development and in crystallization events is discussed. 相似文献
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Rudolf K. Potucek Alykhan Sumar Petr Vanýsek Viola I. Birss 《Electrochimica acta》2007,52(28):8031-8038
Crystal impedance (CI) is a well-known technique which extends the capabilities of the quartz crystal microbalance (QCMB) technique by refining the apparent mass change reported by QCMB resonance frequency measurements into a corrected mass change and an energy loss or dissipation component. In addition to mass change, the energy loss component can provide information about additional sample properties, such as surface rigidity or roughness, as well as the viscoeleastic properties of the medium in which measurements are performed. Previous reports of CI measurements involve the use of a network analyzer, an instrument not commonly found in an electrochemical research group. Here, we describe how to utilize a more common electrochemical impedance spectroscopy (EIS) system with sufficient bandwidth for the purpose of collecting CI data. Specifically, we discuss the measurement setup required to minimize impedance mismatch and a means of mathematically correcting for the impedance of the measurement system itself. We demonstrate the utility of this system using the CI response of a Pt-coated crystal to D-fructose solutions with known density and viscosity. 相似文献
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率值和矿化剂或晶种对水泥生料易烧性的影响 总被引:3,自引:3,他引:3
通过对138个常用水泥生料样的易烧性试验结果进行统计比较后得知,熟料烧成率值的变化对生料易烧性系数K1400℃影响较大。其中KH平均每降低0.01,K1400℃提高0.36%;n平均每升高0.10,K1400℃、降低0.61%;P平均每升高0.10,K1400℃降低0.58%左右。掺加适量的复合矿化剂、晶种、萤石矿化剂后均使生料易烧性得到明显改善,其改善效果由好到差顺序依次为复合矿化剂≥晶种≥萤石矿化剂,外掺后分别使K1400℃比未掺时平均提高3.69%、2.77%和2.22%左右。 相似文献
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针对中国石油抚顺石化公司石油一厂润滑油过滤速度差异大的问题,研究了润滑油各侧线所含不同蜡组分对应的晶型特点和蜡晶改进剂的作用机理,提出了蜡晶改进剂的选用原则。 相似文献
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安徽省东关水泥厂立窑采用晶种煅烧工艺后,原用LFEF袋除尘器出现了结露等一系列不良工况,为此,该厂对其采取了强化密封,减少漏风;进风管上设置水冷蝶阀和冷风阀调控温度,选用经特殊表面处理的抗结露滤料和微机自动化控制系统等技术措施,确保了LFEF除尘器的正常运行。文章对立窑等用品种煅烧工艺,LFEF除尘器的操作技术和不良工况的处理措施也作了详细介绍。 相似文献
