CO2 mineral sequestration by wollastonite carbonation     

Wenjin Ding  Liangjie Fu  Jing Ouyang  Huaming Yang 《Physics and Chemistry of Minerals》2014,41(7):489-496

In this paper, we demonstrated a new approach to CO₂ mineral sequestration using wollastonite carbonation assisted by sulfuric acid and ammonia. Samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and ²⁹Si nuclear magnetic resonance. The change in Gibbs free energy from ?223 kJ/mol for the leaching reaction of wollastonite to ?101 kJ/mol for the carbonation reaction indicated that these two reactions can proceed spontaneously. The leached and carbonated wollastonite showed fibrous bassanite and granular calcium carbonate, respectively, while the crystal structure of pristine wollastonite was destroyed and the majority of the Ca²⁺ in pristine wollastonite leached. The chemical changes in the phases were monitored during the whole process. A high carbonation rate of 91.1 % could be obtained under the action of sulfuric acid and ammonia at 30 °C at normal atmospheric pressure, indicating its potential use for CO₂ sequestration.  相似文献   

Design and Implementation of the Hydrographic Production and Management Information System (HYPAMIS)     

Deren Li  Haigang Sui  Xinyan Zhu  Jianya Gong 《Marine Geodesy》2013,36(2):137-157

With the development of hydrographic work and information techniques, the traditional work mode is not suitable for the Chinese Marine Safety Administration Bureau (CMSAB). Aiming at the separation of charts production and management, a new idea that is the integration of production, management, and quality control is presented. Geographic Information System (GIS), Management Information System (MIS), Office Automation (OA) and Spatial Database Management (SDM) advanced techniques are introduced into the workflows in CMSAB. To realize information sharing, a mixed mode with Browser/Server (B/S) mode and Client/Serve (C/S) mode are adopted. Based on the above ideas and strategies, an integrated system named Hydrographic Production And Management Information System (HYPAMIS) was developed. The whole workflow and three subworkflows including survey management workflow, production workflow, and quality control workflow of are outlined after re-engineering the CMSAB organization. Some design principles and key techniques of the HYPAMIS including the cooperation of GIS and MIS, object-oriented spatial data model and management, data management based on database, and security control are illustrated in detail. Then the implementation of the system is introduced briefly. Finally, performance evaluation of the system and future work is given.  相似文献   

江苏宜兴骆驼墩遗址地层全新世沉积环境研究   总被引：1，自引：1，他引：0       下载免费PDF全文

李兰  朱诚  林留根  张广胜  欧阳杰  周慎明 《第四纪研究》2010,30(2):393-401

主要通过对骆驼墩遗址地层样品的粒度和重砂矿物的鉴定、样品中锆石形态的对比研究,铷锶值的测定与分析,了解该区域全新世以来的沉积环境及其气候变化,探索气候变化与人类文明和文化发展的关系。对骆驼墩遗址文化层下的自然淤积层的粒度分析和锆石形态研究发现该区域在人类出现之前可能经历过浅水泻湖环境;  结合重矿物及铷锶研究发现,该区域在全新世早期降水量较大,气候较为湿热,之后气候逐渐变得温暖湿润,为人类文明的出现和文化的发展提供了一个优越的气候条件;  通过对地层中文化层样品的重矿物鉴定及百分含量分析、ZTR稳定系数及Rb/Sr分析发现,全新世的气候是不断变化的。尤其在马家浜文化时期、良渚文化时期和广富林文化时期气候经历过温湿与干凉的交替变化过程。同时良渚文化时期的中晚期稳定系数出现了该地层的最高值,说明当时气候较为湿热,降水量偏多,这与良渚文化的消失与洪水有关的结论相一致。  相似文献   

Element geochemistry of weathering profile of dolomitite and its implications for the average chemical composition of the upper-continental crust   总被引：1，自引：0，他引：1  

Hongbing Ji  Ziyuan Ouyang  Shijie Wang  Dequan Zhou 《中国科学D辑(英文版)》2000,43(1):23-35

Geochemical behavior of chemical elements is studied in a dolomitite weathering profile in upland of karst terrain in northern Guizhou. Two stages can be recognized during the process ofin situ weathering of dolomitite: the stage of sedentary accumulation of leaching residue of dolomitite and the stage of chemical weathering evolution of sedentary soil. Ni, Cr, Mo, W and Ti are the least mobile elements with reference to Al. The geochemical behavior of REE is similar to that observed in weathering of other types of rocks. Fractionation of REE is noticed during weathering, and the two layers of REE enrichments are thought to result from downward movement of the weathering front in response to changes in the environment. It is considered that the chemistry of the upper part of the profile, which was more intensively weathered, is representative of the mobile components of the upper curst at the time the dolomitite was formed, while the less weathered lower profile is chemically representative of the immobile constitution. Like glacial till and loess, the “insoluble” materials in carbonate rocks originating from chemical sedimentation may also provide valuable information about the average chemical composition of the upper continental crust.  相似文献   

变质矿物生长的局部平衡体系——以贺兰山北段孔兹岩系为例   总被引：1，自引：0，他引：1  

刘建忠  卢良兆  李铁胜  欧阳自远 《矿物学报》2000,(1)

贺兰山北段孔兹岩系详细的岩石学和矿物学的研究表明 ,岩石中的特征变质矿物如石榴子石、堇青石等的成分与其周围相邻的同世代变质矿物具有很好的相关性 ,而与其寄生主岩成分的相关性较小 ,而贯通矿物如斜长石却与其寄生主岩成分的相关性较为密切 ,同时天然块状样品的脱水熔融实验的结果也显示 ,变质反应是在一个局部平衡体系中进行的。说明在变质作用过程中 ,变质反应的进行以及新矿物的形成是在一个局部平衡的体系下完成的 ,因此在矿物对温压计的使用上 ,应利用处于平衡状态的相邻变质矿物来计算。  相似文献   

湖北银洞沟银金矿构造特征及构造控矿作用     

魏兴炎  秦正永 《华北地质》1999,(1)

武当地区位于华北板块与扬子板块的接合部位,属秦岭造山带。武当群组成一系列大型韧一脆性剪切带巨型推覆体,银洞沟推覆岩席是其中之一。该区早期构造样式为伸展作用及其伴生的韧性或韧脆性面型剪切,晚期为推覆线性剪切。根据面理、线理、褶皱、剪切带等研究成果,作者总结了银洞沟地区构造性质、成矿作用及模式。武当地区多重滑脱是在古地壳演化的不同阶段发育的不同层次的顺层剪切带,发育于变火山岩与变沉积岩之间的滑脱面（DF_2）控制了银、金矿床的形成。  相似文献   

太阳黑子对东海气旋及热带气旋活动的影响     

陈文玉  何翔 《海洋预报》1999,16(1):35-40

本文利用１９４９～１９９７年的资料,以统计分析的方法,对太阳黑子及东海气旋①,热带气旋②活动的互相关系,进行了初步探讨,归纳出几点有参考价值的结论  相似文献   

多点锚泊系统吸引子和吸引域的计算   总被引：1，自引：0，他引：1  

欧阳茹荃  朱继懋 《海洋工程》1999

  相似文献   

矿物3CaO·3Al_2O_3·BaSO_4形成过程研究   总被引：1，自引：0，他引：1  

张文生  李北星  欧阳世翕  冯修吉 《矿物岩石地球化学通报》1999,(4)

ｅｏｒｅａｎｕ等［１］研究ＣａＯＡｌ２Ｏ３Ｍｘ（ＳＯ４）Ｙ［Ｍ＝Ｍｇ２＋、Ｓｒ２＋、Ｂａ２＋、Ｚｎ２＋、Ｆｅ２＋、Ｆｅ３＋、Ａｌ３］系统中,形成类似于矿物３ＣａＯ·３Ａｌ２Ｏ３·ＣａＳＯ４（硫铝酸钙）的可能性时,报道合成了新矿物３ＣａＯ·３Ａｌ２Ｏ３·ＢａＳＯ４（简写为３ＣＡ·ＢａＳＯ４）;部分学者［２,３］研究过它的胶凝性能等。在有关文献中,研究者制备研究用纯矿物的煅烧条件、获得样品的矿相组成不尽相同。如文献［１］在温度１４００℃保温２４０ｍｉｎ,制备的样品包括铝酸钙（ＣａＯ·Ａｌ２Ｏ３…  相似文献   

On the Compensation of Systematic Errors in Marine Gravity Measurements   总被引：1，自引：0，他引：1  

Huang Motao  Guan Zheng  Zhai Guojun  Ouyang Yongzhong 《Marine Geodesy》1999,22(3):183-194

Based on an analysis of the source of errors in marine gravity measurements, an error model, firstly, is constructed mathematically which can characterize the change of systematic errors and with which a new crossover adjustment model is presented in this paper. Then, two methods of compensating the systematic errors are proposed, i.e., the self-calibrating adjustment and the a-posteriori compensation. Some questions involved in solving the adjustment problem, such as the rank deficiency, the choice of error model, the weighting of model parameters and the significance test of compensation efficiency, etc., are discussed in detail. Finally, a practical survey network is used as a case study to test the efficiency and reliability of the two compensation methods.  相似文献