氧化物对CaO熟料的烧结过程和抗水化性的影响

在较低的煅烧温度（１６００℃）下，用优质石灰石和一些氧化物做添加剂来制造ＣａＯ熟料，并且对它们做了抗水化性试验，特别是测定了烧结温度，保温时间和Ａｌ２Ｏ３量对熟料烧结性能的影响，试验结果表明，以Ａｌ２Ｏ３作为添加剂的熟料水化速度比其它熟料慢得多。添加Ａｌ２Ｏ３可使晶粒发育好，显气孔率低，得出了煅烧温度高于１５００℃的ＣａＯ熟料显气孔率和烧结时间的对数关系，含Ａｌ２Ｏ３的ＣａＯ熟料的抗水化性好，是由     

Al2O3对CaO烧结过程的作用

在较低温度下(≤1600℃)，将添加Al2O3的高纯石灰石在不同煅烧温度下制得了CaO烧结熟科。考察了煅烧温度、保温时间及不同的Al2O3添加量对CaO烧结的作用。试验结果表明，Al2O3的加入使CaO在煅烧过程中得到发育良好的晶粒和撮低的显气孔率。在高于1500℃煅烧的试样中，显气孔率与保温时间之间呈对数关系，这种烧结熟料良好的抗水化性能在于其级低的显气孔率和发育良好的CaO晶粒自身水化活性的降低。     

红柱石粉精矿及合成莫来石的烧结性能

以河南西峡红柱石浮选粉精矿为原料，按比例配加工业氧化铝、高铝矾土生料和熟料，经成型后在１６００℃，１６５０℃和且１７００℃温度下煅烧．测定各试样的体积密度、显气孔率或吸水率。同时，用正文试验法研究了Ｔｉ０２、Ｃａｏ、Ｌａ２Ｏ３三种加入物对试样烧结性的影响。     

孝义铝土矿区半软质粘土烧结性研究

通过全面分析研究孝义铝土矿区半软质粘土的矿物构成和化学成份，证明该矿物属含有少量多水高岑石的高岑石型半软质粘土。根据矿物的性质制定出矿物原料的成型、煅烧工艺。实验表明：该矿物的烧结性与煅烧温度关系密切，且烧结温度范围较窄，是良好的陶瓷及耐火材料原料。     

MgO-MgAl2O4复合材料的制备及在耐火材料中的应用

采用烧结海水镁砂和α-Al2O4为原料，以固相反应法制备富镁尖晶石。原料Al2O，和MgO分别按比例进行混合配料。煅烧生成的镁铝尖晶石晶种量随MgO含量和温度的变化而变化，其变化范围为5％～50％。等量配比的试样，经1000℃煅烧2h，随后于1600℃烧结4h，可观察到煅烧粉末中尖晶石相占70％。初期煅烧温度和原生的尖晶石量对烧结试样的致密性和显微结构有着重要影响。探讨了尖晶石含量与结晶化效应和显微结构的关系。     

白云石烧结的试验研究

通过对不同产地高纯白云石的煅烧试验，揭示了白云石烧结的机理。由于白云石在煅烧过程中碳酸盐分解后形成多孔疏松结构，使其难以烧结致密。轻烧白云石经加水消化或机械粉碎和高压处理可破坏其团聚结构，促进烧结。添加少量Ｆｅ２Ｏ３或ＺｒＯ２等氧化物可降低白云石的烧结温度。     

添加剂对烧结刚玉材料的影响研究

本文通过对刚玉烧结材料的体积密度、气孔率、物相组成和表面形貌的分析,研究氟化钡等八种添加剂对烧结刚玉材料性能的作用效果。通过开发添加二氧化锰石墨复合添加剂的方法,在低于传统煅烧温度100℃下,制备出性能优异的烧结刚玉材料。材料的刚玉相含量>93%,体积密度、气孔率等指标都要优于传统煅烧温度煅烧制备的烧结材料原样,且耐火度也达到国家标准。     

高镁质铁尾矿制备镁橄榄石耐火材料试验研究

以河北省某高镁质铁尾矿为原料，经预先煅烧、熟料细磨后掺加少量轻烧镁砂和电熔镁砂，采用模压成型、高温烧结等工艺制备镁橄榄石耐火材料。采用正交试验探讨了铁尾矿熟料细磨时间、粘结剂乙二醇溶解酚醛树脂用量、成型压力、最高烧结温度、保温时间对烧结样品的体积密度、常温抗压强度和荷重软化温度的影响，并优化了工艺参数，结果表明：在铁尾矿熟料细磨15 min、粘结剂用量为8%、等静压成型压力为130 MPa、最高烧结温度为1 500℃、保温时间为6 h的最佳工艺条件下，得到的烧结样品体积密度为2.80 g/cm³、常温抗压强度为50.7 MPa、荷重软化温度为1 685℃、抗热震性为10次，主晶相为镁橄榄石，次晶相为方镁石，另含少量尖晶石。研究成果可为此类铁尾矿的综合利用提供技术支撑。     

不同烧结工艺制备耐高温高透过率氮化物复合材料的研究

对相同组分的氮化物复合材料,在不同温度段采用无压、气氛压力烧结,进行性能对比试验。分析了两种工艺研制的材料性能在不同温度下的变化规律,探讨了相同温度下不同烧成工艺对材料密度、强度、耐温性、耐烧蚀性及介电性能的影响。     

溶胶—凝胶法制备莫来石先驱粉末的烧结特性及材料的显微结构变化

对用溶胶－凝胶法制备的莫来石先驱粉末的晶化及烧结行为为进行了研究，先驱粉末在１０００℃煅烧１ｈ形成少量尖晶石，在更高的高度由这种尖晶石相及无定形ＳｉＯ２相形成莫来石，煅烧后的粉末具有很高的活性，在１５５０℃烧成０．５ｈ，烧结体相对密度达到９８．７％，陶瓷显微结构由细小等轴莫来石晶粒构成，随着烧成时间的延长或烧成温度的升高，烧结体中柱状莫来石晶粒变得越来越多。     

Investigation of the redox performance of pyrite cinder calcined at different temperature in chemical looping combustion

As an industrial solid waste, pyrite cinder exhibited excellent reactivity and cycle stability in chemical looping combustion. Prior to the experiment, oxygen carriers often experienced a high temperature calcination process to stabilize the physico-chemical properties, which presented significant influence on the redox performance of oxygen carriers. However, the effect of calcination temperature on the cyclic reaction performance of pyrite cinder has not been studied in detail. In this work, the effect of calcination temperature on the redox activity and attrition characteristic of pyrite cinder were studied in a fluidized-bed reactor using CH₄ as fuel. A series of pyrite cinder samples were prepared by controlling the calcination temperature. The redox activity and attrition rate of the obtained pyrite cinder samples were investigated deeply. The results showed that calcination temperature displayed significant impact on the redox performance of pyrite cinder. Considering CH₄ conversion (80%–85%) and attrition resistance, the pyrite cinder calcined at 1050?℃ presented excellent redox properties. In the whole experiment process, the CO₂ selectivity of the pyrite cinder samples were not affected by the calcination temperature and were still close to 100%. The results can provide reference for optimizing the calcination temperature of pyrite cinder during chemical looping process.     

煅烧过程中影响铁铬催化剂强度的因素

利用Dn饱合最优实验设计方法考察了铁系变换催化剂煅烧过程中强度的影响因素。并用二次型方程关联了强度均值与煅烧时的主要影响因素的关系。结果表明,温度、时间、升温速率和原料含水率对催化剂强度的均值和可靠性都有显著影响。对实验结果进行了初步讨论。     

萍乡废弃煤矸石理化特性及热活化性能研究

为研究不同种类煤矸石的理化特性及煅烧温度对其活化程度的影响,以萍乡废弃煤矸石不同矿区样A、样B、样C为研究对象,开展了XRD测试、物理性能试验、高温试验及力学性能试验,从理化特征、力学特征、表观特征等方面对煤矸石进行了基本性能及热活化性能分析。结果表明:不同种类煤矸石的理化特性不同,活性物质含量高的煤矸石活性较高;与样A相比,样B、样C更适合做填料,且样C具有更高的孔隙率、吸水性和抵抗风化破裂的能力。不同种类煤矸石的最佳煅烧温度略有差距,但都在800 ℃左右,未煅烧或未达到最佳煅烧温度的煤矸石活性较低,所制试件胶结较差,强度不高;最佳温度煅烧的煤矸石活性最高,所制试件胶结最好,强度最高。     

贵州省钾长石提钾工艺初步研究

在高温条件下,利用熔融浸渍法,对贵州万山地区钾长石进行提钾工艺研究,全面探讨助熔剂的阴离子及阳离子对钾提取率的影响,最终选定NaCl为最佳助熔剂。正交实验数据表明,钾长石提钾的较佳工艺条件为:焙烧温度900℃、焙烧时间120 min、m(钾长石)∶m(NaCl)=1.5,钾的提取率为87.97%。     

焙烧温度对氧化铝物化性质及微观结构的影响

以拟薄水铝石为前驱体,经不同温度焙烧制备氧化铝,利用X-射线衍射、N2-物理吸附、扫描电镜、透射电镜等技术对其物化性质及微观结构进行表征,系统研究了焙烧温度对氧化铝物化性质及微观结构的影响规律.结果表明:在低温(500～800℃)条件下焙烧时,氧化铝的比表面积、孔容随着焙烧温度的升高缓慢降低,平均孔径缓慢增大,分别46...     

K/SiO_2催化醋酸甲酯与甲醛合成丙烯酸甲酯

以K/Si O_2为催化剂,利用醋酸甲酯与甲醛合成丙烯酸甲酯,分别考察了活性组分来源、负载量、浸渍条件以及催化剂焙烧温度对反应的影响。研究结果表明:采用硝酸钾作为钾源,催化剂具有较好的性能,醋酸甲酯的转化率为19.94%,丙烯酸甲酯收率为4.56%。K负载量低于15%时,增加负载量有利于提高催化活性,负载量为15%时,催化活性最高,醋酸甲酯转化率为23.5%,丙烯酸甲酯收率为6.8%。此外,浸渍条件和焙烧温度对催化剂性能也有较大的影响,超声浸渍可以提高活性组分在载体表面的分散度,有利于催化活性的提高;升高焙烧温度可以促进硝酸钾的分解,增强催化剂碱性强度,提高催化活性。     

回转窑煅烧活性石灰的工艺

结合生产和实验等有关资料,对回转窑煅烧活性石灰的生产工艺进行了深人研究,分析了煅烧温度、保温时间、助燃风量以及窑体转速等对石灰活性度的影响,并对回转窑煅烧优质活性石灰的生产工艺提出几点看法。     

Influence of oxygen percentage in calcination atmosphere on structure and electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material for lithium-ion batteries

Different calcination atmospheres of air, 50% oxygen (vs. N₂) and pure oxygen have been used to prepare special LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials to observe the influence of oxygen composition. To investigate the structure and electrochemical property of the samples using different oxygen compositions, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), cycling performance tests and electrochemical impedance spectroscopy (EIS) were carried out. XRD, SEM, and XPS results show that the sample made using higher oxygen composition has less cation mixing and lower levels of Ni²⁺. However, both samples have almost the same oxygen environments on their surfaces as well as micro-morphology and size. The sample with a higher oxygen composition shows better electrochemical performance. Interestingly, the electrochemical performance of the sample made using 50% oxygen is similar to that made with pure oxygen and much better than the sample made with air. It has a specific capacity of 202.4 mAh g⁻¹ at 0.1C and a capacity retention of 85.2% after 300 cycles at 1C, which may be meaningful for balancing cost and performance.     

焙烧温度对Cu-Ce/MgO催化合成气制低碳醇性能的影响

采用并流共沉淀法在不同焙烧温度下制备Cu-Ce/Mg O催化剂,考察焙烧温度对其催化CO加氢合成低碳混合醇反应性能的影响,并借助X射线衍射(XRD)、N2物理吸附(N2-adsorption)等手段对催化剂的结构进行表征。结果表明,随着焙烧温度的升高,催化剂中Ce O2晶粒增大,催化剂比表面积减小;在CO加氢反应中,焙烧温度的适当升高明显增加了催化剂活性组元之间的相互作用,使催化剂活性及低碳醇选择性明显升高;450℃的焙烧温度下,CO的转化率为54.51%,醇的选择性达到38.40%。     

Optimizing calcination temperature of Fe/activated carbon catalysts for CWPO

The influence of the calcination temperature (within the temperature range 150–300 °C) on the chemical nature of the surface as well as on the activity of an own-made Fe/AC catalyst for catalytic wet peroxide oxidation (CWPO) has been studied. The catalyst surface was characterized by means of TG, TPD and N₂ adsorption/desorption analysis. The presence of iron promotes the oxidation of the activated carbon surface, increasing the amount of oxygen surface groups, mainly carboxylic acid, anhydride and lactone groups. On the other hand, the calcination step modifies the distribution of these groups, increasing the amount of lactone groups and reducing the pH_slurry. Within the temperature range studied, the calcination temperature does not affect to the porous structure. The changes observed in the catalyst surface led to an increase of the catalytic activity as a consequence of a higher H₂O₂ decomposition into OH radicals, probably due to a better dispersion of the active phase. Neither oxygen surface groups by themselves nor pH_slurry seemed to have influence on the catalytic activity.