Physical and chemical characteristics of after-reclamation dust from used sand moulds     

Rafał Dańko  Jan Jezierski  Mariusz Holtzer 《Arabian Journal of Geosciences》2016,9(2):153

The paper presents the results of investigations of physical and chemical properties of after reclamation dust that is generated in the foundry industry. Universally applied mechanical reclamation processes of spent moulding sands generate large amounts of after-reclamation dusts containing mainly rubbed spent binding agents and quartz dusts. An amount of after-reclamation dusts—in dependence of the reclamation system efficiency and the reclaim dedusting system—can reach 5–10 % in relation to the total reclaimed spent moulding sand. After-reclamation dusts originated from spent moulding sands with different kinds of resins mostly belong to dangerous wastes, since they contain chemo-setting binders with dangerous substances removed in the reclamation process. None of the companies producing mechanical reclamation systems offers presently the complex technology and equipment for utilisation of after reclamation dusts, which would meet technical and economic expectations of foundry plants. The paper presents the results of research carried out at the Faculty of Foundry Engineering AGH UST in Cracow which aims on the determination of possibilities of using the post-reclamation dust generated during mechanical reclamation of used moulding sands with organic resins as a source of energy. Different dusts generated in the mechanical reclamation process of used organic sands, delivered from foundries, were tested to determine their chemical composition, granular characterisation and physicochemical properties. As a result of the investigations, possible ways to utilise the dusts are presented.  相似文献   

The Seismic Response Characteristics of Polyhalite with Shaded Potash Mine in Central Sichuan     

DING Feng  ZHANG Yan  LI Meng  LIU Wei  PENG Da  XU Xiang 《《地质学报》英文版》2014,88(Z1):211-212

正Potash deposition is the result of final phase of brine sedimentary evolution,it’s a limited distribution and easily soluble mineral,it is difficult to find the features on the ground,therefore the prospecting is extremely tough.  相似文献   

内蒙古达茂旗哈力齐矿区含金石英脉特征及金矿找矿标志     

郑云龙  曹希英  荆振刚  徐达 《吉林地质》2014,(1):31-34

内蒙古达茂旗哈力齐地区金矿的主要类型是石英脉型,本区存在两种空间分布、形态、产状截然不同的石英脉。本文作者阐述了含金石英脉的特征,尤其是含金石英脉标型特征;同时得出结论:本区含金石英脉,分布于奥陶纪中酸性岩浆岩带附近,走向为近东西向,且地表表现为呈浅灰—灰白色、透明度低、网格状破裂、裂隙中有大量黄色、褐色次生矿物的石英脉可作为本区石英脉型金矿的找矿指示标志。  相似文献   

Tectonically controlled sedimentation: impact on sediment supply and basin evolution of the Kashafrud Formation (Middle Jurassic,Kopeh-Dagh Basin,northeast Iran)     

Mehrdad Sardar Abadi  Anne-Christine Da Silva  Abdolhossein Amini  Ali Akbar Aliabadi  Frédéric Boulvain  Mohammad Hossein Sardar Abadi 《International Journal of Earth Sciences》2014,103(8):2233-2254

The Kashafrud Formation was deposited in the extensional Kopeh-Dagh Basin during the Late Bajocian to Bathonian (Middle Jurassic) and is potentially the most important siliciclastic unit from NE Iran for petroleum geology. This extensional setting allowed the accumulation of about 1,700 m of siliciclastic sediments during a limited period of time (Upper Bajocian–Bathonian). Here, we present a detailed facies analysis combined with magnetic susceptibility (MS) results focusing on the exceptional record of the Pol-e-Gazi section in the southeastern part of the basin. MS is classically interpreted as related to the amount of detrital input. The amount of these detrital inputs and then the MS being classically influenced by sea-level changes, climate changes and tectonic activity. Facies analysis reveals that the studied rocks were deposited in shallow marine, slope to pro-delta settings. A major transgressive–regressive cycle is recorded in this formation, including fluvial-dominated delta to turbiditic pro-delta settings (transgressive phase), followed by siliciclastic to mixed siliciclastic and carbonate shoreface rocks (regressive phase). During the transgressive phase, hyperpycnal currents were feeding the basin. These hyperpycnal currents are interpreted as related to important tectonic variations, in relation to significant uplift of the hinterland during opening of the basin. This tectonic activity was responsible for stronger erosion, providing a higher amount of siliciclastic input into the basin, leading to a high MS signal. During the regressive phase, the tectonic activity strongly decreased. Furthermore, the depositional setting changed to a wave- to tide-dominated, mixed carbonate–siliciclastic setting. Because of the absence of strong tectonic variations, bulk MS was controlled by other factors such as sea-level and climatic changes. Fluctuations in carbonate production, possibly related to sea-level variations, influenced the MS of the siliciclastic/carbonate cycles. Carbonate intervals are characterized by a strong decrease of MS values indicates a gradual reduction of detrital influx. Therefore, the intensity of tectonic movement is thought to be the dominant factor in controlling sediment supply, changes in accommodation space and modes of deposition throughout the Middle Jurassic sedimentary succession in the Pol-e-Gazi section and possibly in the Kopeh-Dagh Basin in general.  相似文献   

豫西登封寒武系馒头组碳酸盐岩中的风暴沉积及相关的生物成因构造     

齐永安  姚倩  代明月  李妲 《华北地质》2014,(4)

豫西登封地区寒武系第三统馒头组三段发育了一套含大量生物成因构造的碳酸盐岩风暴沉积。风暴沉积标志包括冲刷面构造、砾屑灰岩及各类交错层理,生物成因构造包括微生物成因构造-叠层石及后生动物扰动构造-各类垂直潜穴。该区风暴沉积包括3种沉积序列:序列1由侵蚀底面、砾屑灰岩段和交错层理段组成,代表了风暴高峰期和衰减期形成的原地型风暴沉积;序列2由侵蚀底面、砾屑灰岩段和泥岩、泥灰岩段组成,为风暴高峰期和间歇期形成的近源型风暴沉积;序列3由侵蚀底面、交错层理段和叠层石灰岩段组成,反映了风暴衰减期和间歇期形成的远源型风暴沉积。这些风暴沉积代表了不同风暴作用留下的多期不完整风暴沉积记录。  相似文献   

一种新型近景式测绘采集器的设计与实现     

张涛  刘晶东  刘达 《测绘与空间地理信息》2022,45(4)

  相似文献   

Sound propagation in two-axis underwater channel based on beam-displacement ray-mode theory     

张林  笪良龙  卢晓亭 《中国海洋湖沼学报》2007,25(3):300-303

Sound propagation in a deep ocean two-axis underwater channel is often complex and difficult to simulate between surface channel and sound fixing and ranging (SOFAR) channel. The beam-displacement ray-mode (BDRM) theory is a normal mode method for propagation modeling in horizontally stratified shallow water. An improved method for computing the upper boundary reflection coefficient in the BDRM is proposed and applied to calculate the acoustic fields of a two-axis underwater channel. Transmission losses in the two-axis underwater channel are calculated in the new BDRM. The corresponding results are in good agreement with those from the Kraken code, and furthermore the computed speed of the new BDRM excels the other methods.  相似文献   

北京市土地利用变化的空间分布特征   总被引：45，自引：10，他引：45  

庄大方  邓祥征  战金艳  赵涛 《地理研究》2002,21(6):667-674

土地利用变化是全球变化中的重要组成部分 ,是短期内人类活动对自然环境施加影响的显著表现形式。本文基于遥感和地理信息系统技术 ,利用LandsatTM图像的解译成果 ,分析了北京市 1985～ 2 0 0 0年土地利用变化的空间分布特征。研究表明 ,在这 15年的时间里 ,北京市林地和城乡、工矿、居住用地的转移趋势明显 ,两者的转移率分别达到 4 0 78%和37 60 % ,主要以林地内部、林地向草地转移、居住用地的内部和工矿废弃地还林还草等类型为主。同时 ,各类土地利用类型的净变化呈现出明显的区域差异。  相似文献   

含激电效应的航空瞬变电磁数据横向约束反演     

路俊涛  雷达  任浩 《地球物理学进展》2022,37(1):220-229

受激电效应影响,航空瞬变电磁响应曲线经常出现异常快速衰减和符号反转现象,使用Cole-Cole模型的等效电阻率代替原模型实电阻率能很好的解释该现象,但由于激电多个参数的引入,使得反演多解性问题更加严重.本文基于Cole-Cole模型实现了航空瞬变电磁一维正演,采用横向约束反演同时计算激电参数及层厚,增加约束条件改善多解...  相似文献   

福建漳平北坑场钼多金属矿床辉钼矿Re-Os同位素年龄及其地质意义   总被引：7，自引：0，他引：7  

张达  吴淦国  刘乃忠  狄永军  吕良冀  曹文融 《地质学报》2010,84(10)

福建漳平钼多金属矿床位于闽西南晚古生代坳陷东缘。中生代以来,闽西南坳陷经历了强烈的构造岩浆作用的改造,并伴随多期次成矿作用的发生。已有同位素年代学研究成果表明该区存在早侏罗世、中侏罗世以及早白垩世成矿作用,但缺少与晚侏罗世大规模岩浆作用相关的成矿年代学记录。本文选取漳平北坑场钼多金属矿床开展辉钼矿的Re-Os同位素年代学研究。根据Re-Os同位素测年结果,结合矿床围岩蚀变及矿化特征以及与岩体的相互关系,指出钼矿化的形成经历了多个成矿阶段,其中小规模的矿化发生在148.8±2.2Ma。主矿化阶段形成的矿床以细脉或网脉状赋存于下二叠统翠屏山组石英细砂岩中,其等时线年龄为139.8±2.3～143.7±2.1Ma,为晚侏罗世—早白垩世成矿。成矿物质主要来源于特提斯向环太平洋构造域转换后闽西南地区晚侏罗世—早白垩世壳源花岗岩浆。  相似文献