离子交换法生产碳酸钾的工艺探讨     

王秀巩固  唐明林等 《矿物岩石》1990,10(1):166-169

本文讨论以工业KCI和NH4HCO3为原料、采用离子交换法（国产732钠型树脂）生产K2CO3的工艺。小试验的结果：以20％KCI溶液上柱，以分段交换率在50％以前为穿漏点、流速为0．033(ml/min.ml树脂）时，总交换率达83．3％，工作交换容量达2．24（毫摩尔钾／ml树脂）；当以饱和NH4HCO3溶液进行解脱、流速在0．033(ml/min.ml树脂）时，解脱率达91．8％，产品的含量为98．2％。  相似文献   

大义山西北端硼矿床特征及其控矿因素     

周荣文  唐先礼 《湖南地质》1990,9(3):20-24

湖南大义山西北端的硼矿属接触交代—热液叠加型。矿体赋存于大义山花岗岩体中上石炭统壶天群白云岩接触带中,呈层状、似层状,局部为透镜状,分枝复合明显。矿石组分复杂,结构构造多样。富镁的碳酸盐岩是有利的成矿围岩;富含硼、氟的大义山花岗岩体是成矿母岩;广泛发育的节理裂隙是容矿构造。外围尚有一定的找矿远景。  相似文献   

山地自然灾害（以泥石流为主）及其防治   总被引：15，自引：1，他引：15  

唐邦兴  吴积善 《地理学报》1990,45(2):202-209

我国是一个山地自然灾害严重的国家,尤其是泥石流、滑坡灾害。八十年代以来山地自然灾害频繁,泥石流、滑坡所造成经济损失超过30亿元。本文分析了灾害成因、分布特征以及山地自然灾害的预报和防治。  相似文献   

中国岩浆硫化物矿床的主要成矿机制   总被引：38，自引：8，他引：30  

汤中立 《地质学报》1996,70(3):237-243

深部熔离—贯入成矿机制,即指母岩浆侵入现存空间之前,在深部就发生了熔离作用和部分结晶作用,使母岩浆分离为不含矿岩浆、含矿岩浆、富矿岩浆、矿浆几部分,然后对现存空间一次或多次上侵贯入成矿。一般来说,经过深部熔离后的不含矿岩浆的体积,比含矿岩浆、富矿岩浆和矿浆的体积要大得多,在上侵过程中,不含矿岩浆大部分都侵入到不同的空间或喷溢出地表,形成岩群或岩流,剩余的岩浆、含矿岩浆、富矿岩浆和矿浆可以多次贯入同一空间成岩、成矿(金川),也可以分别贯入不同的空间成岩、成矿(红旗岭)。比照就地熔离的矿床,这种深部熔离—贯入矿床的岩体体积就小得多,含矿率和矿石品位也高得多,所以这种成矿作用导致形成小岩体,大矿床。  相似文献   

Coronal Loops Above a Sunspot Region     

Fang  C.  Tang  Y. H.  Ding  M. D.  Zhao  J.  Sakurai  T.  Hiei  E. 《Solar physics》1997,176(2):267-277

By analysing the data of Yohkoh soft X-ray images, vector magnetograms and 2D spectral observations, coronal loops above a large sunspot on 16–19 May 1994 have been studied. It is shown that the loops follow generally the alignment of concentrated magnetic flux. The results indicate that the soft X-ray emission is low just above the sunspot, while some loops connecting regions with opposite magnetic polarities show strong soft X-ray emission. Especially, the part of the loops near the weaker magnetic field region tends to be brighter than the one near the stronger magnetic field. The temperature around the top of the loops is typically 3 × 10⁶ K, which is higher than that at the legs of the loops by a factor of 1.5–2.0. The density near the top of the loops is about 5 x 10⁹ cm^-3, which is higher than that of the leg parts of the loops. These loops represent probably the sites where strong magnetic flux and/or current are concentrated.  相似文献   

硅岩研究的进展   总被引：11，自引：1，他引：11  

唐世荣 《地球科学进展》1994,9(6):71-75

回顾了国外硅岩的研究历史，概述了当今的研究现状和未来的发展趋势，并与我国同一领域的研究状况作了对比分析，提出了改变国内硅岩研究落后现状的几点建议。  相似文献   

Potentials of community-based tourism in transformations towards green economies after the 2008 Wenchuan earthquake in West China     

Yong Tang 《山地科学学报》2016,13(9):1688-1700

This study investigates the contrasting sceneries of community-based tourism after the 2008 Wenchuan earthquake and focuses on the potentials of tourism in transformations towards green economies. How are tourism and environment linked in a sustainable relationship? And how can potentials of community-based tourism be directed in transformations towards green economies? A qualitative research design is used to examine contrasting sceneries and specific green elements of community-based tourism in a Qiang people's fortress village in Mao County, Sichuan Province, West China and further discuss how tourism can be compatible with human wellbeing through demonstrating a commitment to sustainable development. The study argues that potential economic, social and environmental costs of tourism need to be considered when evaluating the loss of community benefits toward sustainability. The green elements suggest the potential of community-based tourism in transformations towards green economies, involving green agricultural, green building, and green energy, green governance, green service and green consumption. This study will contribute to the debate about the relationship between tourism and environment sustainability in the green economies, as well as the critique of what can be learned for community development from green tourism in mountainous regions after the inevitable natural disasters.  相似文献   

Evolution of the Late Cretaceous Yongfeng-Chongren Basin in Jiangxi Province,southeast China: insights from sedimentary facies analysis and pebble counting   总被引：2，自引：0，他引：2  

Liu-qin Chen  Fu-sheng Guo  Chao Tang 《山地科学学报》2016,13(2):342-351

The Gan-Hang Belt in Southeast China is characterized by several igneous and siliciclastic basins associated with crustal extension during Late Mesozoic. The sedimentary evolution of the red basins is still poorly understood. In this study, sedimentary facies analysis and pebble counting were performed on outcrop sections of the Late Cretaceous Guifeng Group in the Yongfeng-Chongren Basin in central Jiangxi Province. Thirty-five conglomerate outcrops were chosen to measure pebble lithology, size, roundness, weathering degree and preferred orientation. Results show that gravels are mostly fine to coarse pebbles and comprise dominantly quartzites, metamorphic rocks, granitoids and sandstones. Rose diagrams based on imbricated pebbles indicate variable paleocurrent directions. Combining with typical sedimentary structures and vertical successions, we suggest that the Guifeng Group were deposited in alluvial fan, river and playa lake depositional systems. The proposed depositional model indicates that the Hekou Formation represents the start-up stage of the faulted basin, accompanied by sedimentation in alluvial fan and braided river environments. Then this basin turned into a stable expansion stage during the deposition of the Tangbian Formation. Except for minor coarse sediments at the basin margin, the other area is covered with fine-grained sediments of lake and river environments. The Lianhe Formation, however, is once again featured by conglomerates, suggesting a probable tectonic event. Therefore, the study region possibly suffered two tectonic events represented by the conglomerates of the Hekou and Lianhe formations in the context of the crustal extension in Southeast China.  相似文献   

Matched field localization based on CS-MUSIC algorithm     

Shuangle Guo  Ruichun Tang  Linhui Peng  Xiaopeng Ji 《中国海洋大学学报(英文版)》2016,15(2):254-260

The problem caused by shortness or excessiveness of snapshots and by coherent sources in underwater acoustic positioning is considered. A matched field localization algorithm based on CS-MUSIC (Compressive Sensing Multiple Signal Classification) is proposed based on the sparse mathematical model of the underwater positioning. The signal matrix is calculated through the SVD (Singular Value Decomposition) of the observation matrix. The observation matrix in the sparse mathematical model is replaced by the signal matrix, and a new concise sparse mathematical model is obtained, which means not only the scale of the localization problem but also the noise level is reduced; then the new sparse mathematical model is solved by the CS-MUSIC algorithm which is a combination of CS (Compressive Sensing) method and MUSIC (Multiple Signal Classification) method. The algorithm proposed in this paper can overcome effectively the difficulties caused by correlated sources and shortness of snapshots, and it can also reduce the time complexity and noise level of the localization problem by using the SVD of the observation matrix when the number of snapshots is large, which will be proved in this paper.  相似文献   

山东铁矿时空分布与成矿规律研究     

张增奇  郭宝奎  程伟  倪振平  孙斌  杨德平  迟乃杰 《地质论评》2016,62(S1):243-244

山东省铁矿资源较丰富,根据山东省矿产资源储量表,截止2015年底,累计查明资源储量6.267Gt,其中鲁西地区保有资源储量占全省总量的94%左右,且以大、中型矿床居多;鲁东地区矿床规模一般较小,多分散分布,保有资源储量占全省总量的6%左右。共发现铁矿矿产地278处,其中大型矿产地18处,中型矿产地72处,小型矿产地188处,形成了莱芜、金岭、苍峄、韩旺等重要铁矿供应基地。近年来,山东省铁矿勘查工作发展迅猛,发现多个大型、超大型铁矿床,尤其在隐伏区和主要成矿区带的的深部及外围勘查找矿成果显著。主要成果有济宁颜店超大型铁矿（1.579Gt）、临沂兰陵超大型铁矿（0.622Gt）、苍峄铁矿东端超大型铁矿（王埝沟铁矿、凤凰山铁矿、沟西铁矿和宋楼铁矿,总储量达0.6Gt）、东阿单庄中型铁矿（0.069Gt）等。最近山东省煤田地质局和山东化工地质勘查院在禹城李屯和齐河县仁里集镇大张村地区进行铁矿勘查工作,发现隐覆在第四系之下的富铁矿矿床,类型为接触交代型铁矿。矿体分布在闪长岩与奥陶纪灰岩接触带上,矿体厚近百米,TFe品位56%～65%,资源量预计超过亿吨,是目前我省品位最高的铁矿床,具有良好的勘查前景。  相似文献