共查询到20条相似文献，搜索用时 140 毫秒
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硅灰石合成多孔二氧化硅 ——工艺条件与产物性质研究 总被引：4，自引：1，他引：4
在一系列硅灰石酸处理实验基础上，研究了产物性质与反应速度、反应时间、中和最终pH值等工艺条件的关系。结果表明，工艺条件不同，物理性质也大不相同。 相似文献
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准噶尔盆地东南缘油页岩干馏的PY-GC模拟 总被引：1，自引：0，他引：1
采用热解气相色谱技术,通过多温度区间加热和单温度区间加热2种方式模拟了准噶尔盆地东南缘大黄山油页岩的干馏过程。多温度区间热模拟的结果表明,油页岩的干馏过程分起始阶段、高峰阶段和末尾阶段3个阶段。起始阶段热解的产物很少,到高峰阶段产物的产量突增,90%的产物在这一阶段生成,末尾阶段的热解产物以气体为主;多温度区间热模拟的结果对页岩的工业干馏工艺设计具有一定的指导意义。单温度区间热模拟的结果表明,干馏产物有以轻质组分为主和以重质组分为主2种类型。目前的研究表明,风化程度和焦油产率是影响干馏产物构成的主要因素。 相似文献
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人造金刚石合成片中的特殊产物 总被引：1，自引：0，他引：1
在人造金刚石合成片内,常见矿物为金刚石、再结晶石墨和金属碳化物.此外,在与叶腊石接触的局域空间,发现了新的特殊产物锰铝榴石、锰辉石和锰橄榄石,为人造金刚石用非金属催化剂的合成工艺提供了启示. 相似文献
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矿石工艺类型是指按矿石工艺性质,主要是矿石选矿工艺性质的差别,对矿石所作的分类.它以矿石物质成分的研究为基础,以为制定选冶工艺流程提供可靠依据为目的.矿石工艺类型通常是在矿石自然类型的基础上细分而成,它与矿石工业类型有时相似,有时又不同. “矿石工艺类型”一词主要适用于选矿学,是选矿学的重要组成部分之一.本文从应用地质学的角度提出研究矿石工艺类型的重要性.如所周知,矿石是一定地质作用下的产物,其工艺性质上的差异是由于成矿地 相似文献
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利用浮石合成13X型分子筛最佳工艺条件的研究 总被引：8，自引：0，他引：8
以吉林省长白山地区的天然浮石为原料，成功地合成了１３Ｘ型分子筛，对其合成路线，反应条件进行了研究，确定了合成１３Ｘ型分子筛的最佳工艺条件，并通过Ｘ射线衍射法及差热分析等手段证明了产物的结构。 相似文献
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以吉林省长白山地区的天然浮石为原料，成功地合成了１３Ｘ型分子筛，对其合成路线，反应条件进行了研究，确定了合成１３Ｘ型分子筛的最佳工艺条件，并通过Ｘ射线衍射法及差热分析等手段证明了产物的结构 相似文献
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In laboratory simulation of oil generation, products from closed systems pyrolysis of immature source rocks in the presence of water gives the closest match to petroleum compositions observed in nature. Fresh biomass can also be converted to fluids by pyrolysis, but in the absence of the sedimentary diagenetic transformations, the initially much higher oxygen content gives high yields of oxygen containing products. In this work, the reactions that occur during hydrous pyrolysis of a Kimmeridge source rock, a brown coal and two polymeric waste materials from alginate production are compared in terms of quantities of the main products and kinetic models of the reaction systems. The biomass pyrolysis and the simulated maturation are described in similar reaction networks. Conversion of biomass to fluids occurred with reaction networks and activation energy distributions comparable to the brown coal, while for the Kimmeridge source rock reactions a simpler reaction network could be used. The biomass samples gave a high degree of conversion to fluid products, and higher yields of bitumen than the coal. 相似文献
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土体饱和度确定的两个问题 总被引：6，自引：0，他引：6
本文探讨了有关土饱和度确定的两个问题，由于试验技术手段的限制，土堆栈 饱和度只能通过其它物理性质指标之间的关系来求取，这样换算得到的饱和度往往偏大，并且，根据实验分析，地下水位以下的粘性土并不都是饱和的，因此，在岩土工程中，非饱和土工力学亟待深入研究。 相似文献
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有机质中的纤维素和腐殖质会影响软土的力学性质,有机质含量越高,软土的力学特性就会越差。为研究高有机质软土的固结特性,通过对不同深度高有机质软土的渗透性、固结以及微、细观结构特征进行试验,并利用分解程度试验结果,分析高有机质软土的特殊渗透、固结和结构特征的形成机制。研究结果表明,不同埋深的高有机质软土渗透系数差别较大,且渗透固结速度较快,基本处于粉砂到粉质黏土数量级;0.5～1.8 m埋深的土层垂直渗透系数小于水平渗透系数,其余深度垂直渗透系数均大于水平渗透系数;分解程度的研究表明,分解程度直接影响高有机质软土的压缩固结特性,低分解程度的土层更容易发生塑性变形。由埋藏从浅到深,结构由絮凝结构逐渐向叠片结构转化,最后转变为集块结构。结合土体的分解程度分析,得出高有机质软土的分解程度高低直接影响高有机质软土的渗透、固结以及结构特性。 相似文献
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The reductive degree and rate of Bama ilmenite concentrate by graphite under argon atmosphere were measured by using thermogravimetric analysis system at the temperatures from 850 °C to 1400 °C. The reduction degree of the ilmenite increased with temperature rise, the case similar to reaction rate. The higher the temperature was, the faster the reaction rate was. The phases before and after reduction and the morphology of reduced samples were identified by using X-ray diffraction and optical microscopy analysis, respectively. The reduction degree of the ilmenite decreased due to the presence of impurities. Manganese and magnesium oxide-rich zones formed which prevented complete reduction of Fe2+. In general, the reaction products were iron, Ti3O5, reduced rutiles and pseudobrookite solid solution. The kinetics was also discussed and it was found that the rate-controlling steps were different in the different temperature ranges. 相似文献
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通过对不同变质程度煤的Ｘ射线衍射分析，探讨了各种煤的结构特点，提出了考察煤变质程度的新指标－变质系数，不仅合理，而且能较精确地反映出煤的变质程度。 相似文献
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滑坡危险性评价与预测是滑坡灾害防治中的首要任务,科学合理地评价滑坡危险性十分重要。以岩桑树水电站库区发育的潜在滑坡为例,据其特有的地质环境条件,选取坡体风化程度、斜坡坡度等9个影响因素作为滑坡危险性评价的指标,并建立分级标准将滑坡危险性分为轻度危险、中度危险、重度危险和极度危险4个等级。将突变理论运用到滑坡危险性评价中,从而建立了新的稳定性评判模型。基于突变级数法的滑坡危险性评价方法,综合考虑了各评价指标间的相关性,真实地描绘了滑坡系统的内在机制。实例分析结果表明,该方法评判结果准确率高,可为滑坡的防治提供依据。 相似文献
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Polycyclic aromatic hydrocarbons (PAHs) with a hydrous or an unhydrous mineral matrix were impacted and analyzed, to study the behavior of PAHs against shock. Results of the shock experiments suggested that volatiles discharged from the hydrous mineral did not influence the behavior of PAHs against shock. The shocked samples contained unreacted starting PAHs, soot-like materials insoluble in dichloromethane, and secondarily formed PAHs with molecular weights ranging from 128 to 404. Approximately 95% of starting PAHs decomposed at ∼30 GPa and the dominant product was the soot-like materials. Formation mechanisms of the shock products were explained by reaction processes under static high pressure-temperature conditions (e.g., carbonization, radical addition reaction, ring cross linking, and methylation).We applied these results to estimate the survival degree of organic matter delivered by carbonaceous asteroids against their impact pressures at the accretion stage of early Earth. If we use a simplified homogeneous accretion model without atmosphere to represent the stage, the radius of Earth causing 30 GPa, the pressure at which PAHs almost decompose, was calculated as 2270 km (4.0 km s−1 of impact velocity) for the impact of carbonaceous asteroids. In the case of impactors striking not land but oceans on the early Earth, the impact velocity for the decomposition of PAHs was estimated to be 6.0 km s−1. These impact velocities should have been commonly realized on the early Earth, due to the airburst and the aerobreak of impactors in the dense atmosphere. The early Earth should have been a favorable environment for obtaining and maintaining a large quantity of prebiotic organic materials leading to life. 相似文献