福建龙岩风化型高岭土矿床中粘土矿物的研究   总被引：4，自引：1，他引：4  

张天乐  王宗泉 《岩石矿物学杂志》1990,9(3):234-244

福建龙岩高岭土矿床风化剖面各风化带有特征的粘士矿物组合。高岭矿物在风化剖面中由下而上逐渐增多,反映出花岗岩中原生矿物高岭土化程度逐渐加强的阶段性变化。高岭石结晶较差,以薄片状或具长石、云母假象的大于2um粒级出现。埃洛石为7或10型,多富集在小于2um粒级中。埃洛石结晶形态的多样性及多变性与矿物形成时的物质来源及水化状态有关。长石蚀变为高岭矿物,可以经由水铝英石向球状或管状埃洛石直到高岭石的转变、长石的固态转变和从溶液中直接结晶等几个途径。白云母的高岭土化能直接转变为具云母假象的高岭石。  相似文献   

从高岭土中富集地开石和珍珠陶石的实验研究     

沈忠悦 《矿物岩石》1994,(2)

本文报道了用氢氟酸溶蚀的方法，从天然高岭土中分离和富集地开石或珍珠陶石。研究表明，用适当的氢氟酸溶蚀处理，与高岭石伴生的微生地开石或珍珠陶石被富集于残余粘土中，从而达到分离和富集地开石或珍珠陶石的目的．在高岭石、地开石和珍珠陶石中，以珍珠陶石耐氢氟酸的稳定性最好，地开石次之，高岭石最易被溶蚀。  相似文献   

Hydrothermal synthesis of kaolinite illustrated by X-ray diffractograms and scanning electron micrographs,part II     

Dr. O. Lahodny-Šarc  Dr. D. Došen-Šver  Dr. W. D. Keller 《Mineralogy and Petrology》1984,32(4):235-246

Summary The hydrothermal synthesis of kaolinite from various alumina and silica starting materials reacted at 200°C in aqueous solutions of oxalic acid and H₂SO₄ with the corresponding saturated water vapour pressure, in periods of time from 10 to 25 days, has been followed by X-ray diffraction measurements, scanning electron microscopy, and energy dispersive analysis of the products. The temperature and time periods of reactions were chosen on the basis of previously collected data on the effects of H₄EDTA, a complex-forming agent, and of H₂SO₄, an inorganic acid, on the rate of formation of kaolinite. Aluminium-complexing acids increase the rate of formation or decrease the temperature of formation of kaolinite as shown by evidence from X-ray diffraction patterns. The influence of the starting materials as sources of aluminum, amorphous aluminum hydroxides, pseudoboehmite, allophane or gibbsite, has also been examined by X-ray diffraction, scanning electron microscopy, and by energy dispersive analysis. Scanning electron micrographs indicated that silica is a more mobile phase than alumina, based on the progressive formation of a thin coating on gibbsite during early reaction, then by growth of clusters of platy crystals of kaolin, and finally by production of pellets of stacked crystal flakes. Where gibbsite was used in the reaction mixture, boehmite was commonly observed as an intermediate phase.With 16 Figures  相似文献   

我国北方两种高岭石的电子顺磁共振研究   总被引：4，自引：2，他引：4  

何宏平  郭九皋 《矿物学报》1994,14(3):265-269

笔者对我国北方两种不同类型的高岭石进行了化学分析、差热和热重分析、X射线衍射、红外吸收光谱及电子顺磁共振等研究。结果表明，在酸性还原条件下形成的高岭石中，铁主要以Fe2＋的形式置换结构中的Al3＋，同时也有部分铁以亚铁化合物形式存在；在氧化条件下形成的高岭石中，铁主要以Fe3＋形式存在于晶体结构和杂质铁氧化合物中，也有部分以Fe2＋置换Al3＋形式存在。  相似文献   

Possible uses of kaolin wastes and transformed materials from the Amazon region （northern Brazil） for environmental applications     

Romulo Simoes Angelica 《中国地球化学学报》2006,25(B08):25-25

The most important Brazilian kaolin district is located in the Amazon region. The beneficiation of this kaolin produces great volumes of wastes, mainly composed of coarse-grained kaolinite not suitable for the paper industry but still very fine and ideal for several other purposes. About 1000 M ton kaolinite-rich wastes are produced annually. The sludge is disposed on artificial sedimentary lakes that occupy extensive areas, with huge impacts on the environment due to extensive deforested areas needed for their construction. This work is indeed to present the different studies that have been carried out in order to characterize and find proper applications of such wastes and transformed products. Possible applications include： （1） production of high-reactivity metakaolinite and fine-grained silica for construction materials; （2） alumina for different applications （ceramic and adsorbents）. Methods used include： drying and calcination of the kaolin-residue, Al-extraction for low-granulometry alumina and silica （here named as sioclay） production. Start- and transformed materials were characterized by means of XRF, XRD, DTS-TG-DSC, FTIR, SEM-EDS, BET, among others. Technological assays were also carried out for ceramic purposes. The mineralogy is dominated by kaolinite, quartz and trace amounts of anatase, rutile, hematite and goethite. Total chemical analyses of all worked materials also reflect the theoretical composition of kaolinite. Both metakaolinite and sioclay do not exhibit X-ray diffraction patterns and present a very small grain size. Metakaolinite, alumina and sioclay exhibit increasingly values of specific area. For the ceramic products, sintering increases its mechanical resistance. Adsorption tests of different metals on kaolin-transformed products were carried out in a batch reactor. Tests will be presented for As, which is a toxic and carcinogenic metalloid. Results for As （V） adsorption carried out in this investigation reveal the ability of sioclay〉alumina〉metakaolin to remove this element by sorption from the solution.  相似文献   

姬塬地区上三叠统长2油层组高岭石胶结与储层评价   总被引：3，自引：0，他引：3       下载免费PDF全文

朱世全  黄思静  姚鹏  吴素娟  胡作维 《沉积与特提斯地质》2006,26(1):88-91

姬塬地区长2油层组次生孔隙在储层砂岩的孔隙构成中比值偏大,成岩作用对储集空间的发育具有明显的控制优势。同时,该区长2油层组高岭石分布是鄂尔多斯盆地中南部较为集中且相对偏高的地区,显示出姬塬地区长2油层组在大气水作用、次生孔隙发育等方面具有特殊性。通过对该区高岭石胶结物含量和分布特征的研究,综合考虑储层物性的平面变化特征、沉积相带、构造高点等影响因素,对有利的储层区块提出了建议。  相似文献   

苏州高岭石的热变过程研究     

姚林波  高振敏 《矿物学报》2007,27(3):255-261

运用X射线衍射、红外光谱及固体高分辨核磁共振等手段，研究了苏州高岭石560～1600℃热变产物，结果显示：①高岭石．偏高岭石．莫来石的转变系列存在结构上的连续性，其转变经历了脱羟阶段（约400～600℃），偏高岭石阶段（600～800℃），相分离阶段（800～1100℃），莫来石阶段（1100～1600℃）；②莫来石形成过程没有出现AlO3的大量分凝，但存在SiO2分凝；③偏高岭石．莫来石转变过程的中间相为Al-Si尖晶石和准莫来石；④引起1000℃放热反应的主要因素是SiO2的大量分凝，其次是准莫来石等过渡相的形成。  相似文献   

Control Factors of Solutional Voids in Feldspars and Favorable Zone Forecast of Chang 2 Oil Reservoir Group in the Midwest Ordos Basin          下载免费PDF全文

GUO Shaobin ZHAO Pengda 《《地质学报》英文版》2007,81(5):798-804

The development of pores in a clastic reservoir is one of the most important research subjects in oil-gas exploration and development,whereas the many reasons for the formation of secondary porosity have increased the degree of difficulty in such research.Thus the research aims are to discover the controlling factors of solutional voids in feldspars and to predict favorable regions for these voids. Macroscopic and systematic researches into the relationship between the kaolinite content in the feldspar solutional void developed area of the Chang 2 reservoir group of the Triassic Yanchang Formation in the Midwest Ordos Basin and the solutional void in feldspar have been made,and from this it can be determined that the kaolinite content has an indicative function to the distribution of the solutional void in feldspar.Solutional void in feldspar is relatively well developed at the area where kaolinite content is high.Although the factors affecting kaolinite content are complicated,yet that of the research area is mainly affected by the impact of the leaching atmospheric water acting on the palaeogeomorphology.Three favorable zone belts for the development of solutional voids in feldspars are forecasted on the basis of restoration of palaeogeomorphology.  相似文献   

贵州新民铝土矿矿床Li的地球化学特征与富集机制探究   总被引：2，自引：2，他引：0  

龙珍  付勇  何伟  唐波  龙克树  刘阳  王天顺 《矿床地质》2021,40(4):873-889

新民铝土矿床位于黔北务川-正安-道真地区(简称务正道地区)大塘向斜东翼,铝土矿(岩)型Li资源丰富.含矿岩系大竹园组(P1d)不同岩性的w(Li)有差别:土状-半土状铝土矿平均w(Li)为16.34×10-6,致密块状铝土矿平均w(Li)是803.84×10-6,铝土岩平均w(Li)是1436.22×10-6,黏土岩的平均w(Li)是786.62×10-6,梁山组泥岩的平均w(Li)是51.82×10-,韩家店群泥岩(页岩)的平均w(Li)是48.52×10-6,黄龙组灰岩的平均w(Li)是 11.99×10-6.由此可知,研究区铝土矿(岩)型Li资源主要富集在含矿岩系中上部的致密块状铝土矿、铝土岩和黏土岩中,顶板、底板以及土状-半土状铝土矿w(Li)较低.Li主要赋存于高岭石中,伊利石(水云母)和残存的三水铝石、勃姆石也可富集少量Li,当样品中赋锂矿物(高岭石、伊利石(水云母)、三水铝石和勃姆石)都存在时,高w(Li),主量元素w(Al3O2)、w(SiO2)、w(MgO)、w(K2O)、w(TiO2)和w(TFe2O3)与w(Li)的相关性也证实了上述结果.研究区的地球化学比值 CIA、w(Sr)/w(Cu)、u(CaO)/w(MgO)、w(Sr)/w(Ba)、w(V)/w(V+Ni)和 w(La)/w(Y)综合显示,炎热潮湿的古气候下,有机质腐烂形成酸性环境,半封闭海湾环境下,黏土化阶段中等强烈的化学风化程度和适宜的风化暴露剥蚀时间利于铝硅酸盐矿物和硅酸盐矿物化学键断裂,富集Al3+形成高岭石;风化程度过于强烈和长时间的风化剥蚀,继续脱Si富Al形成以硬水铝石为主的铝土矿;弱酸性-弱碱性以及氧化-还原过渡条件下,使得高岭石能最大程度的吸附Li元素.  相似文献   

煅烧温度对高岭石相转变过程及Si、Al活性的影响   总被引：9，自引：0，他引：9  

魏存弟  杨殿范  李益  三国彰 《矿物学报》2005,25(3):197-202

通过对吉林通化煤系高岭石和美国Georgia高岭石在200～1300℃热处理产物的MASNMR谱和XRD,IR,DTA等的研究,主要获得如下结论：①煅烧高岭石的相转变经历了四个阶段——脱羟阶段（约550℃）,偏高岭石阶段（550～850℃）,SiO2分凝（850～1100℃）及Al2O3分凝阶段（950～1100℃）,莫来石、方英石形成阶段（1100℃以上）;②偏高岭石-莫来石的相转变过程中存在SiO2和Al2O3的分凝,其中SiO2的分凝温度是850℃,而Al2O3的分凝温度是950℃;③1100℃开始,由偏高岭石分凝形成的非晶质SiO2一部分和Al2O3-γ发生反应生成了莫来石,一部分结晶为方英石;④煅烧高岭石Si、Al活性总体上随着煅烧温度的增高逐渐增强,其中Al的活性在900℃时达到最高,Si在1100℃时达到最高,当温度超过这两个临界点时,Si、Al活性将迅速下降。  相似文献