共查询到20条相似文献，搜索用时 100 毫秒
1.
本文引用了大量国内外文献,就我国应用最广的各种金的分离富集技术与发射光谱测定方法、金样及其分析结果的处理方法、结合作者个人经验作了讨论。实践表明:当前,影响微金分析误差的主要因素,已不是光谱定量测定方法,而是金样均匀性及由制样而引起的加工误差。到目前为止,活性炭吸附与泡塑吸附仍然是最适于发射光谱定量测定的两项分离富集技术。 相似文献
2.
3.
4.
5.
笔者认为,在目前改革开放政策的形势下,岩矿实验工作者要走向社会.向开放的技术市场迈步,只能立足于技术上的某些优势,服务于社会。本文从岩矿实验工作者熟知的领域中,以泡塑吸附法为例,通过技术横向开发可能性的探讨,抛砖引玉.试图推动分离富集技术的横向开发利用。 相似文献
6.
7.
制备条件对聚乙烯醇-壳聚糖凝胶性能的影响 总被引：1，自引：0，他引：1
以戊二醛为交联剂,由聚乙烯醇(PVA)和壳聚糖(CTS)混合交联得到一种水凝胶,考察了聚乙烯醇和壳聚糖的配比、交联剂用量和反应时间对聚乙烯醇/壳聚糖凝胶吸水率的影响。通过单因素实验,得出了聚乙烯醇/壳聚糖凝胶具有最佳溶胀性能时的条件:聚乙烯醇与壳聚糖的摩尔比为6∶1,交联剂戊二醛的体积分数为0.05%,反应时间9h。测定了该凝胶在不同pH值下的吸水率和吸附铜离子的性能,得出聚乙烯醇/壳聚糖凝胶在酸性介质的吸水率远远大于碱性介质,对铜离子(Cu2+)的吸附量比壳聚糖凝胶提高了33.7%,因此该凝胶吸附剂在工业废水处理重金属离子方面具有一定的优越性。 相似文献
8.
针对页岩储层气体滑脱效应特征及其影响机制不清问题，选取四川盆地长宁地区志留系龙马溪组页岩样品，开展了低温氮气吸附孔隙结构表征实验，并利用非稳态脉冲衰竭方法测量了不同围压下氦气、氮气在页岩岩心上的气体渗透率，分析了平均孔隙压力、气体类型、围压对滑脱效应的影响，建立了滑脱因子的预测关系式。结果表明:压力低于2.5 MPa时，页岩气体滑脱效应不能忽略。由于“分子筛效应”的影响，页岩克氏渗透率与测试流体介质类型有关，以氦气为流动介质测试得到的克氏渗透率大于以氮气为流动介质的测试结果。滑脱效应与气体类型有关，龙马溪组页岩的氦气滑脱因子约为氮气滑脱因子的1.7倍。利用滑脱因子计算得到围压为10~40 MPa时，氦气在页岩上的有效渗流孔径为113~166 nm，氮气的有效渗流孔径为66~99 nm，均远大于液氮吸附法测试的平均孔径。建立了龙马溪组页岩气体滑脱因子与克氏渗透率的幂函数关系，为页岩气流动模型的建立提供了基础。 相似文献
9.
本文研究了在ＨＣｌ介质中，Ｄ４０１（ＥＤＴＡ）螯合树脂对铂、钯的吸附性能。实验表明，在ｐＨ＝２～４范围内，树脂对钯有良好的吸附性能，饱和吸附量７０．５ｍｇＰｄ（Ⅱ）／ｇ—Ｒ。ＰＨ≥４时对铂不吸附；钯的负载柱可用［０．１ｍｏｌＴｕ（硫脲）＋０．５ｍｏｌＨＣｌ］／Ｌ混合液定量洗脱，洗脱率为９９．２％、获得了ｐＨ＝４盐酸溶液中树脂柱分离铂、钯的方法。 相似文献
10.
水体中S2-与砷(As)的迁移富集密切相关, 但不同含水介质中其作用机理尚不明确。为了查明潜流带中常见含水介质河砂在S2-作用下对As的吸附特征, 设计并开展了As在河砂上的吸附动力学实验, 以及S2-作用下河砂对As的吸附实验, 结合PHREEQC模拟计算, XRD、SEM-EDS、XPS和FTIR等表征测试技术, 进一步识别其作用机理。结果表明: 固液比为25 g/L情况下, 河砂对As的吸附在200 h左右达到吸附平衡, 且对As(Ⅴ)的吸附量明显高于As(Ⅲ); 随着S2-浓度的增加, 河砂对As吸附能力逐渐减弱; 模拟及表征测试结果显示, 少量As被吸附在河砂表面, 主要与其表面的Fe、Al结合, 其中As(Ⅲ)的吸附可能还与Si-O键断裂后与S2-结合形成的SiS2有关。S2-对河砂吸附As的主要影响机理为: ①S2-的加入使得溶液pH值升高、Eh值降低, 从而抑制了As的吸附; ②添加S2-条件下河砂表面的Fe、Al等能与S和As形成AlAs、AlAsO4、FeS2及Fe4As2O11等化合物, 减少了河砂表面吸附As的活性位点。研究结果有助于丰富As-S作用机理, 以及As在地下水环境中迁移过程的认识。 相似文献
11.
伍良海 《广东海洋大学学报》1992,(2)
用正交试验方法对聚硫橡胶改性环氧树脂粘接性能的配方进行了设计试验。正交试验(9次比常规试验(27次)少试验18次,得出同样结果。并对塑料配方技术作初步探讨。 相似文献
12.
Research and development on foam breaking and recycling technology in air-foam drilling 总被引：1，自引：0，他引：1
In recent years, air-foam combining the advantages of both liquid and air drilling has been utilized as a drilling medium. Air-foam drilling has proved its efficiency in numerous situations where serious problems were encountered, such as in fractured formations and depleted or high permeable zones. However, the major disadvantage of air-foam drilling system is that the foam can only be used once, so that an extremely large pit is required to contain the foam to allow sufficient room for cuttings and for the foam to dissipate. Moreover, it needs enormous volume prepared, consuming abundance of water and ingredient additives, which results in the high cost of foam drilling. The recycling foam fluid by using foam breaking technology is the only effective method to solve these problems associated with the known foam drilling. Various types of equipment and technique have been employed to suppress foam formation in biological and process equipment in foam drilling. The study described various methods of foam breaking technology, and the trend of the foam breaking technology for foam drilling is discussed. 相似文献
13.
浙北龙潭组C2煤层底板高岭石泥岩经差热、X线衍射、红外吸收光谱和电镜分析，表明它含丰富的粘土矿物，以高岭石和7埃洛石为主，而石英、菱铁矿、蒙托石和有机质等为次。文中对粘土矿物的特征及形成环境和成因进行了讨论。高岭石泥岩层位稳定、蕴藏量大，对煤系对比、煤层勘探开采和综合开发利用均有重要的地质意义。 相似文献
14.
CAO Pinlu ZHANG Jincheng WU Xia HUANG Jinyun Institute of Drilling Engineering Technology Zhongyuan Petroleum Exploration Bureau Puyang Henan China 《东北亚地学研究》2009,(4):204-209,214
In recent years, air-foam combining the advantages of both liquid and air drilling has been utilized as a drilling medium. Air-foam drilling has proved its efficiency in numerous situations where serious problems were encountered, such as in fractured formations and depleted or high permeable zones. However, the major disadvantage of air-foam drilling system is that the foam can only be used once, so that an extremely large pit is required to contain the foam to allow sufficient room for cuttings and for the foam to dissipate. Moreover, it needs enormous volume prepared, consuming abundance of water and ingredient additives, which results in the high cost of foam drilling. The recycling foam fluid by using foam breaking technology is the only effective method to solve these problems associated with the known foam drilling. Various types of equipment and technique have been employed to suppress foam formation in biological and process equipment in foam drilling. The study described various methods of foam breaking technology, and the trend of the foam breaking technology for foam drilling is discussed. 相似文献
15.
陈月飞 《东北石油大学学报》2012,(6):65-70,10
油藏储层内药剂吸附有效性和泡沫细分层注水长段塞连续注入方式容易导致气窜和吸液剖面反转,影响整体措施效果,采用目标油田油砂填制模型,考察药剂动态吸附后再生能力和泡沫综合性能,分析泡沫小段塞间隔注入和长段塞连续注入分流增产效果.结果表明:在多孔介质吸附后,不同药剂再生能力和泡沫综合性能下降,但随着驱替体积增大有效性逐步增强;泡沫小段塞间隔注入好于泡沫大段塞连续注入方式.渤海SZ36-1油田非混相泡沫段塞细分层注水单井试注表明,泡沫小段塞间隔注入比长段塞连续注入方式日增油提高23m3,日降水率提高2.6%,累计增油提高1.72×104 m3,有效期提高7个月以上,进一步验证泡沫小段塞间隔注入的技术优势. 相似文献
16.
为了优选良好储层适应性起泡剂及评价注入参数和封堵性能,通过实验静态评价泡沫高度最高、持续时间最长、表面张力最低的起泡剂.模拟真实储层环境,采用动态方法优选泡沫气液比、起泡剂质量分数、注入参数和在多孔介质中生成泡沫的封堵有效期,其中气液比对储层压力比较敏感,优选时需要设置回压;质量分数优选可以在无回压的条件下进行.结果表明:氮气泡沫在多孔介质中的封堵有效期远大于在体相中的有效期.采用静态和动态相结合的方法对氮气泡沫封堵性能进行评价是合理的,可以为矿场应用提供指导. 相似文献
17.
Permittivity of a sea foam layer is very important in investigating ocean brightness temperature model. At microwave frequency, the Rayleigh method is developed to estimate the effective permittivity of the sea foam layer. To simplify the tedious calculation of sea foam effective permittivity at L band(1.4 GHz), Pade’ approximation is adopted to fit the sea foam effective permittivity computed by the Rayleigh method. With this fitting formula, a new brightness temperature model of sea foam layer defined by certain geophysical parameters, such as air volume fraction(AVF), sea surface temperature(SST), sea surface salinity(SSS) and thickness of foam layer d, is given. Furthermore, the sensitivities of the brightness temperature model to SST, SSS, d and AVF of a sea foam layer at L band are discussed. The sensitivities are ranked from most to least in the order:(1) d;(2) AVF;(3) SSS;(4) SST. This result indicates that the measurement errors of d and AVF have significant impacts on the retrievals of SSS and SST. With the experimental brightness temperature data, the SSS and AFV are retrieved by cost function. 相似文献
18.
Research on experiment and calculation of foam bursting device 总被引：1，自引：0，他引：1
Hazaea Mohammed Youhong SUN Ould El HousseinYarbana Longxiang XU Al-Aswar Fahmi 《世界地质(英文版)》2007,10(1)
This research presents experimental data on mechanical foam bursting device, based on the high speed of air fluid impinging insidethe foam bursting device, foam bubbles disrupted as a consequence of pressures changed very quickly as shear force and their impact forces. Experimental data on foam-bursting capacity have been presented. Designed device can provide effective foam bursting on collapse foam. 相似文献
19.
References： 《东北亚地学研究》2007,10(1):34-38
This research presents experimental data on mechanical foam bursting device,based on the high speed of air fluid impinging insidethe foam bursting device,foam bubbles disrupted as a consequence of pressures changed very quickly as shear force and their impact forces.Experimental data on foam-bursting capacity have been presented.Designed device can provide effective foam bursting on collapse foam. 相似文献
20.
The authors presented indoor practice experiments of parameters affect on foaming and foam stability. Experiments were carried out and special equipments were used to determine foaming and foam stability; tests were tabulated and charted. The effects of chemical and physical parameters on foaming and foam stability have been conducted. 相似文献