The Effect of Additives on Calcium Sulfate Dihydrate Crystallization Kinetics in Gypsum Type Brine System     

ZHANG Lei  XIANG Jun  CHENG Penggao  TANG N  WANG Xuekui 《《地质学报》英文版》2014,88(Z1):399-400

正1 Introduction There exist calcium and sulfate ions outside sodium chloride in solution mining for calcium sulfate brine.The calcium and sulfate ions not only affect the purity of the vacuum salt products,but also increase the scaling of vacuum evaporation tanks and brine reusing pipes.Additives have certain impacts on the crystallization dynamics(Randolph et al.,1971).The crystallization  相似文献   

Research on the Evaporating Crystalization Behavior of the Magnesium Sulfate Subtypes Brine at High Temperature     

XIE Shaolei  ZHANG Chao  WANG Xiaohan  JING Yan  JIA Yongzhong 《《地质学报》英文版》2014,88(Z1):387-387

正Research the evaporating crystalization process of the magnesium sulfate subtypes brine at high temperature from Dalangtan salt lake in Qinghai province.It was revealed that the salt lake is a typical subtype magnesium  相似文献   

铌钽矿研究进展和攀西地区铌钽矿成因初探   总被引：12，自引：3，他引：9  

王汾连  赵太平  陈伟 《矿床地质》2012,31(2):293-308

铌钽矿主要产出类型包括伟晶岩型、富Li-F花岗岩型、碱性侵入岩型、碳酸岩型及冲积砂矿型。前2种类型以钽为主,后3种则以铌占主导。铌和钽大多以铌钽独立矿物(铌铁矿、钽铁矿、细晶石、烧绿石等)呈浸染状分布于含矿岩石中,也有部分以类质同象的形式分布于云母、榍石、霓石、钛铁矿等矿物中。关于铌钽矿的富集机制,一些学者认为可由富F-Na和稀有金属(铌、钽等)的花岗质熔体经结晶分异作用形成;另一些学者则根据铌钽矿化与岩石的钠长石化、锂云母化等紧密共生的特点,认为铌钽的富集是岩浆期后流体交代早期形成的花岗岩所致。攀西(攀枝花-西昌)地区的铌钽矿床(化)基本上都是沿着断裂带分布,矿体赋存于印支期碱性岩脉(碱性正长伟晶岩)中,有少数存在于碱性花岗岩中,与区域上邻近的正长岩体及花岗岩体关系密切。其矿石矿物主要为烧绿石、褐钇铌矿等。初步推断,攀西地区的铌钽矿与二叠纪地幔柱活动有关。碱性的正长岩体及花岗岩体与广泛分布的峨眉山玄武岩、辉长岩均是地幔柱岩浆活动的产物,长英质岩体(包括正长岩体和花岗岩体)是富铌钽岩石的母岩体。碱性伟晶岩脉(如炉库和白草地区)是碱性岩浆逐步演化的产物,含矿的碱性花岗岩是花岗质岩浆分异演化的结果。此外,在该地区的铌钽矿床中,铌钽矿物几乎都富集在钠长石化发育的地段,说明后期的热液交代对铌钽的富集也起到了一定作用。因此,攀西地区铌钽的富集是岩浆结晶分异和岩浆期后热液交代共同作用的结果。  相似文献   

河南三门峡贯沟铝土矿矿物组成及其特征     

冯跃文 《地质与勘探》2012,48(3):471-478

[摘 要] 河南三门峡市贯沟铝土矿属喀斯特型铝土矿。研究区内地层发育相对完全,除上奥陶统、 志留系、泥盆系和下石炭统地层缺失外,从太古界到新生界均有出露。铝土矿层主要产出于中石炭系本 溪组下段。矿石以鲕粒和隐晶质结构为主,少量碎屑结构。矿物学分析显示,铝土矿矿石的主要组成矿 物有硬水铝石、锐钛矿、伊利石,另外,还包括少部分高岭石、锆石等。硬水铝石呈隐晶质结构组成矿石 的基质,少部分呈现细小的板状、长柱状形态。锐钛矿存在两种形态:第一种是锐钛矿与硬水铝石二者 同期形成;第二种锐钛矿以脉状穿插在硬水铝石组成的基质中,形成稍晚于硬水铝石。伊利石主要呈鳞 片状集合体形态组成矿石的基质。锆石主要分散在硬水铝石组成的基质中。进一步研究发现:硬水铝 石电子探针分析显示晶体中存在Fe、Si 和Ti 等其它元素,其主体呈隐晶质与锐钛矿密切共生,指示硬水 铝石主要为简单的成岩结晶成因。矿石中的锐钛矿和硬水铝石共生,互相包含和穿插,反映大量的锐钛 矿是成矿期或成岩期结晶形成。对风化作用中形成的伊利石主要由云母转化而形成,该过程中矿物结 构并未发生明显改变。  相似文献   

Underplating and assimilation–fractional crystallization of Mesozoic intrusions in the Tongling area,Anhui Province,East China: evidence from xenoliths and host plutons     

《International Geology Review》2012,54(6):542-555

This paper presents new petrographic observations and geochemical and microprobe analyses for the Laomiaojishan, Xiaotongguanshan, and Tianebaodanshan intrusions in the Tongguanshan mineral district, East China. The plutons vary in composition from quartz monzonitic diorite to pyroxene monzonitic diorite, and contain gabbroic to dioritic xenoliths. The Xiaotongguanshan intrusion yields a SHRIMP zircon U–Pb age of 139.5±2.9 Ma, indicating Late Jurassic to Early Cretaceous magmatism in the Lower Yangtze River Valley. Relative to host rocks, the gabbro and diorite xenoliths are low in SiO₂ (52.03–54.61 wt‐%), Al₂O₃ (12.87–14.43 wt‐%), and total alkalis (Na₂O+K₂O; 5.26–6.30 wt‐%), but high in MgO (5.41–11.66 wt‐%); the host rocks have high SiO₂ (59.97–64.44 wt‐%), Al₂O₃ (16.43–17.59 wt‐%), and total alkalis (6.67–8.25 wt‐%), but are low in MgO (1.52–2.50 wt‐%). Concentrations of rare earth elements (REEs) in the xenoliths (165.70–190.40 ppm) are similar to those in the host rocks (166.12–185.95 ppm), although the ratio of light REEs to heavy REEs in the xenoliths (3.39–4.27) is lower than that in the host plutons (4.86–5.94). All of the analysed rocks show similar REE patterns, although the xenoliths display marked positive Eu anomalies and the host rocks show slightly negative Eu anomalies. Values of epsilon Nd (t) ranges from ?4.9 to ?9.9 in the gabbro xenoliths and from ?11.4 to ?11.9 in the host intrusives. Initial ⁸⁷Sr/⁸⁶Sr ratios are 0.7064–0.7073 in the xenoliths and 0.7072–0.7084 in the quartz monzonitic diorite host rocks. Crystallization temperatures of hornblende and plagioclase in the gabbro xenoliths, diorite xenoliths, and host rocks are 816, 773–790, and 664–725°C, respectively, based on an amphibole–plagioclase geothermometer. The pressures recorded by these phases indicate that they formed at depths of 26, 12–15, and 3–4 km, respectively, based on an aluminum‐in‐hornblende geobarometer. The petrological and geochemical features of the analysed intrusions and xenoliths are consistent with their derivation from basic to intermediate‐acidic magmas that possibly formed via a series of complex interactions between underplated, mantle‐derived basaltic magma and varying amounts of middle‐ to lower‐crustal material, followed by assimilation–fractional crystallization.  相似文献   

Effects of Melt Fractional Crystallization on Whole-Rock Sr-Nd and Zircon Lu-Hf Isotope Systems: a Case Study on Weihai Migmatitic Gneiss, Sulu UHP Metamorphic Terrane, Eastern China     

XU Haijin  YE Kai  ZHANG Junfeng 《《地质学报》英文版》2013,87(Z1):511-512

  相似文献   

花岗伟晶岩结构结晶动力学的研究进展   总被引：1，自引：0，他引：1  

李建康 《地学前缘》2012,19(4):165-172

在地质流体演化方面,花岗伟晶岩位于花岗岩与热液石英脉的过渡位置,对其结构的实验研究对理解火成岩结构具有重要意义。长期以来,花岗伟晶岩被认为是花岗岩浆平衡结晶、缓慢冷却的结果,但近年来的一系列结晶动力学计算和实验发现伟晶岩在过冷却状态下快速生长,其结构主要受到结晶动力学参数的制约,F、B、P等助熔剂和H2O是影响这些参数的主要因素,富助溶剂的硅酸盐水溶液可作为伟晶岩的结晶介质。但由于快速淬火式实验设备的弊端,这些实验只能由淬火后的实验产物估算各类结晶动力学参数,只能以易淬火成玻璃的含水硅酸盐熔体作为结晶介质,只能静态地研究某一过冷却度下的结晶动力学状态。近年来,最新式热液金刚石压腔已经定型,可以模拟包括富助溶剂硅酸盐水溶液在内的各类伟晶岩结晶介质,能够在控制冷却速率的同时原位观测和微束分析晶体生长的动态特征,是模拟伟晶岩结构的理想工具,具有广阔的应用前景。  相似文献   

萃取结晶法回收碳酸钠实验研究          下载免费PDF全文

樊光友  刘有智  祁贵生  张秀东  尚海茹 《盐湖研究》2009,17(3):44-47

研究了萃取结晶回收无机盐的过程,提出了萃取结晶回收盐的优势,并以水-碳酸钠-正丁醇体系为研究对象,分别考察了加料方式、正丁醇与碳酸钠溶液的溶剂比、温度、搅拌速率等因素对碳酸钠收率的影响。结果表明采用反加法、较大的溶剂比和搅拌速率有利于提高碳酸钠的收率,温度的影响不是特别明显。  相似文献   

Complex relationships between salt type and rock properties in a durability experiment of multiple salt–rock treatments     

Swe Yu  Chiaki T. Oguchi 《地球表面变化过程与地形》2009,34(15):2096-2110

A laboratory salt weathering experiment was performed using five salts to attack eight types of rocks to determine the relative significance of rock durability and salt aggressivity to salt crystallization damage. The influence of individual rock properties on the salt susceptibility of the rocks was also evaluated. To study the relation between pore characteristics, salt uptake, and damage, the pre‐ and post‐experiment pore size distributions of the rocks were also examined. It is observed that both salt type and rock properties influenced the damage pattern. The durability ranking of the rocks became significantly altered with the salt type while the variation in salt efficacy ranking with rock type was less pronounced. Of the five salts used, sodium chloride and aluminium sulfate were invariably ineffective with all rock types while sodium carbonate, sodium sulfate, and magnesium sulfate, were markedly more effective in damaging most types of rock used. Of the rock properties investigated, the microporosity (of pores smaller than 0·05 or 0·1 µm) showed the most significant influence on deterioration of the rocks associated with salt crystallization, whereas microporosity of pores smaller than 5 µm played a more important role in salt uptake. Pore size distribution was thus the key factor controlling salt uptake and damage. Rocks with a large number of pores (<5 µm) and a high proportion of pores (<0·05 or 0·1 µm) were particularly susceptible to salt crystallization damage. However, anomalies arose that could not be explained in terms of rock properties or salt efficacy alone. Overall, the relative influences of salt type/efficacy and rock type/properties on salt damage propensity were not clear enough to draw a reasonable conclusion. Salt crystallization damage appears to be influenced by the individual interactions between salts and rocks, which could explain the anomalous results. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

X射线衍射和红外光谱法分析高岭石结晶度     

许乃岑  沈加林  骆宏玉 《火山地质与矿产》2014,(2):152-156

用X射线衍射和红外光谱法研究了浙江临安纤岭一带高岭石样品（A,B,C,D四个样品）的结晶度,并考察两种方法分析结果的相关性.分析结果表明B样品的Hinckley指数为1.28、红外结晶指数为1.57,结晶度最好.两种方法相关性较好,均可用来分析高岭石结晶度.  相似文献