共查询到18条相似文献，搜索用时 187 毫秒
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利用广西红辉沸石资源水热制备纳米微孔材料——沸石分子筛，其工艺流程为“红辉沸石”(预处理) 氢氧化钠 铝酸钠 水→水热反应→晶化合成→过滤、洗涤、烘干→沸石分子筛产品。基于大量实验研究，确定了水热制备A型、P型和X型沸石的最佳工艺技术参数，制备出了质量较高的沸石分子筛产品，并综合分析了红辉沸石粒度、石英杂晶、晶化时间以及反应混合物组成对沸石分子筛水热制备的影响，指明了今后研究工作的努力方向。 相似文献
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渗透系数是可渗透反应墙(PRB)正常运行的关键参数之一,与PRB活性填充材料的选择密切相关。本试验采用常水头渗透系数测试法,首先选用斜发沸石、红辉沸石为作为PRB的活性介质材料,考察了沸石矿物的类型和粒径对PRB渗透系数的影响,试验结果显示,同一粒径的斜发沸石PRB和红辉沸石PRB渗透系数相差一个数量级;处于同一数量级渗透系数沸石PRB,斜发沸石的粒径大于红辉沸石的粒径。在此基础上,以膨润土作为掺和活性介质材料,讨论了渗透系数处于同一数量级沸石PRB,掺和比例对渗透系数的影响,结果表明,膨润土的掺和能导致沸石PRB渗透系数量级上的差异,与斜发沸石相比,红辉沸石更有利于实现沸石PRB系统渗透系数的可调性。 相似文献
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文章研究了采用酸、碱、盐改性红辉沸石和加热活化红辉沸石对改性红辉沸石去除水溶液中氨氮的影响效果。实验结果表明：（1）用红辉沸石去除溶液中氨氮的实验条件选择如下：1搅拌时间为30min;2沸石粒度为40～60目;3沸石用量为2g;4氯化氨溶液浓度为40mg/L;5氯化氨溶液用量为80ml。（2）采用高温活化对提高红辉沸石去除氨氮效率的作用不明显。（3）酸和碱改性对提高红辉沸石去除氨氮的效率有一定的作用,其中盐酸改性的红辉沸石去除氨氮效率为16.2%,硫酸改性的红辉沸石去除氨氮效率为13.1%,碱改性的红辉沸石去除氨氮效率为25.6%。（4）盐改性对红辉沸石去除水溶液中氨氮的影响效果巨大：经盐改性后,去除率由9.6%升高至72.6%。 相似文献
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沸石类矿物因其具有特殊的离子交换与吸附性能,因而较早尝试性地应用于一些工业技术领域。随着研究逐步深入,沸石矿物物理化学已经成为当今矿物学科中的一个研究热点。然而同有色金属密切共生的红辉沸石的产出及对其矿床矿物学研究的报道在国内外却为数不多。最近作者在新疆东天山三岔口铜矿考察中发现一种橙红色矿物,经扫描电镜、化学成分、差热-热重、X射线衍射物相鉴定等分析,确认系一种富铜红辉沸石,在新疆地区尚未有见报道。其晶体化学式为(Na2,Ca)Al2Si7O18.7H2O。该矿物同前人资料相比,地质产状虽很相似,但含铜量w(CuO)高达1.02%,超出微含量的范围,Na、Mg含量高而Si低。 相似文献
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江苏某抽水蓄能电站,上库主坝为混凝土面板堆石坝,由于上库防渗面板基础开挖量大,开挖料大多数为强风化粉砂质泥岩和强风化泥质粉砂岩,拟利用部分强风化中下部开挖料作为主坝填筑料,对于达到挖填平衡、保护环境、减少弃料及提高经济效益具有重要意义。为此对强风化岩石进行了岩石物理性质、抗压强度、压缩变形、矿物成份分析、化学分析等试验研究,同时进行了岩石干湿、变温多次循环疲劳物理力学特性试验,揭示了强风化岩石在干湿、变温循环条件下的变化规律,对于强风化岩石的可利用性及预测其长期稳定性提供了科学依据。 相似文献
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煤层水力压裂模拟实验是研究煤矿井下水力压裂煤岩体致裂增透、弱化机理的有效手段。然而,大尺寸煤岩体原位保真取样技术不成熟,已有大尺寸煤样块多取自卸压区,其在运输和制备过程中会发生二次破坏,导致实验结果失真。因此,使用煤岩体相似材料代替大尺寸原煤执行室内水力压裂模拟实验成为一种可行的选择。煤岩体相似材料试样的力学特性是影响水力压裂效果最重要因素。为精确表征煤岩体相似材料的基础力学特征,选择煤粉、水泥、石膏、砂子为相似材料,设计制作7种配比试样,进行超声波与力学特性耦合响应规律研究。结果表明:煤岩体相似材料试样超声波波速(P波和S波)和强度(单轴抗压和抗拉强度)随着密度的增大而增大,随着孔隙率的增大而减小;相似材料对于超声波波速、强度和密度增大幅度的影响为水泥>砂子>石膏,孔隙率正相反;相似材料水泥和石膏分别在调节试样强度和变形特性方面起主要作用;根据超声波P波波速与强度之间的二次多项式数学模型,通过测定超声波P波波速可提前预测试样的强度;试样力学参数可调整范围大,通过改变相似材料配比可以调整试样的力学性质,精确模拟煤岩体,且试样制作方法简单。此研究可为煤层水力压裂模拟用煤岩体相似材料力学特征相似设计提供依据,促进矿井瓦斯防治技术的发展,具有广泛的应用价值。 相似文献
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Chengping Wu Changchun Yu Weiping Wang Xunbiao Ma Zhengguo Fan Hongwei Zhu 《地球科学进展》2019,34(10):1099-1107
In order to understand the physical characteristics of rocks and ores in Qihe, western Shandong and serve to basic geology and mineral resources investigation, the magnetic and density properties were collected in the survey area and the surrounding area, and statistics and analysis were given on the physical properties in terms of different kinds of rocks and ores. The result is that magnetite has the maximum value of magnetic property, the values of magnetic properties of basic rocks are bigger than the intermediate-acidic intrusive rocks, and the values of magnetic properties of sedimentary rocks are the smallest. The density of the Cenozoic strata is obviously different from formations and intrusive rocks under the covered area. Their interfaces cause the obvious gravity anomalies. The density value of magnetite is the biggest, and the density value of iron pyrite is the second biggest. The density of the metamorphic rocks of the Archeozoic Taishan rock group can cause certain gravity anomaly. Taking advantage of the relationship between the physical characteristics and the geophysical field, this paper mapped the lithology synthesizing other data, determined the ranges of metamorphic rocks and intrusive rocks, and delimited the ranges of ferromagnetic geological bodies as the target prospecting areas. Based on the physical characteristics, the depth and thickness information about the magnetite ore was inferred by conducting gravity and magnetic joint inversion. The result was nearly the same as the result of the verification borehole. The work of the research has promoted the understanding of physical characteristics of rocks and ores in this area, and provided more reliable basis for geophysical inversion and interpretation, geological structure and mineral resources research. 相似文献
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以石膏、浮石、硅藻土等材料为相似材料对多孔含水岩层进行相似材料模拟。试验中采用四因素（硅藻土水泥石膏比、标准砂浮石比、骨胶比、重晶石骨料比）、五水平的正交试验方法,分别对多孔含水岩层的相似材料试件进行密度、单轴抗压强度、孔隙率、弹性模量以及软化系数的测定,得出相应的物理力学性质指标,采用直观分析法分析各因素对物理力学性质的影响规律。分析结果表明：由于各配比度不同,相似材料强度分布范围较广,在与多孔岩层的岩石参数对比中发现,在一定的相似条件下,基本符合多孔岩层岩石的相似要求;硅藻土含量与密度、抗压强度、弹性模量、孔隙率呈负相关,与软化系数呈正相关;浮石含量与密度、抗压强度、弹性模量、软化系数呈负相关,与孔隙率呈正相关。所加入的两种材料可较好地模拟样品的多孔特性。在允许波动范围之内,所建立的模拟多孔含水岩层的经验方程可用于工程实践。 相似文献
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通过相似配比试验,研制不同砂胶比的低强度相似材料,分析了砂胶比和胶结材料中水泥含量对其物理和力学性质的影响及其变化规律。根据上横山多层页岩矿床赋存条件和相似模拟试验要求,确定了3个可行的、有效的相似材料配比,结合相似模拟条件构筑了多层页岩矿床相似材料模型。试验结果表明,相同砂胶比的低强度相似材料的密度、抗压强度、弹性模量和泊松比均随胶结材料中水泥含量的增加而增大;密度、孔隙率、弹性模量和泊松比在低砂胶比条件下具有更小的波动性。进一步研究发现,选择的低强度页岩相似材料实际相似常数与设计相似常数误差≤1.77%;利用数值模拟回采矿床矿柱的变形特征与相似模拟试验基本相似,应变变化幅度≤8.76%,试验模型在多层页岩矿床模型试验研究上具有一定的合理性。研究结果为有效的进行多层页岩矿床地下开采研究提供科学依据和试验基础。 相似文献
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《Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy》1999,24(10):861-870
Weathering rates based on temporal changes in a variety of rock properties were examined for four dated lava domes made of porous rhyolite. The lava domes were erupted at 1.1, 2.6, 20 and 40 ka BP. The time from each eruptive event to the present provide elapsed weathering times. The lava domes have many cooling joints formed immediately after eruption. Joint-bounded blocks have a high porosity, resulting in deep weathering. The blocks have almost uniform characteristics from top to bottom in one outcrop. The mineralogical, chemical, physical and mechanical properties of the four rhyolites were analysed. These results show that the chemical properties and physical properties, including specific surface area, change slowly in the early stage of weathering (0–20,000 years) and quickly in the later stage (20,000–40,000 years), while mechanical strength and bulk density or porosity of the rhyolites change rapidly in the early stage and slowly in the later stage. Mechanical strength reduces by 70–90% relative to fresh rock in 40,000 years, although chemical and physical properties change by only 1023̄0 %. It is concluded that different weathering properties exhibit different rates and patterns of change over 40,000 years, and that mechanical strength is the property most susceptible to weathering. 相似文献
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结合大型地下洞室群地震模拟振动台模型试验研究,根据相似原理,利用正交试验和二次细化试验相结合的试验方法,对岩体相似材料进行配比试验。选用铁精粉、重晶石粉和石英砂作为骨料,石膏为胶凝材料,甘油为调节剂。正交试验以相似材料的密度、抗压强度和变形模量为控制指标,通过极差分析得到各影响因素的重要程度,并在此基础上进行二次细化试验,二次细化试验增加测试相似材料的抗拉强度。这种组合试验方法可通过较少的试验次数得到符合相似指标要求的材料配比,大大提高了配比试验的效率。试验得出的相似材料配比与物理力学指标的变化规律及运用组合试验高效确定具体配比的方法,对类似工程动静力模型试验相似材料模拟具有一定的参考意义。 相似文献
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The physical and mechanical properties of soil are determined by microstructure. Sandy silt, silty sand and other weak cohesive materials have low strength in the dry state, limiting the apply scope of scanning electron microscope and mercury porosimeter in such material. The experiment proposes the use of solid–liquid–gas three-phase transformation principle of menthol to strengthen the soil particle, include related sampling device and experimental procedures, to obtain parameters of the microscope image and porosity characteristics. Scanning electron microscopy show the clear photograph of particle form, spatial position, contact mode, plane pore characteristics and so on for undisturbed silty sand and sandy silt in Shanghai area. Freeze–thaw action can change the micro-pore parameters of soil. The mercury intrusion porosimetry test demonstrates that the pore volume, accumulated pore area, the most probable pore size and appearance probability of frozen-thawed silty sand increase with the decrease of freezing temperature. The pore size shows a normal distribution. Besides, pore size distribution of frozen-thawed sandy silt shows the interval distribution. Increasing the freezing temperature, the pore volume and accumulated pore area for sandy silt increase, while bigger value and smaller probability of the most probable pore diameter are obtained. 相似文献