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广西平果堆积型铝土矿矿石特征及工艺研究 总被引：7，自引：0，他引：7
广西平果岩溶堆积型铝土矿床赋存于岩溶洼地、谷地中的红土层中。可供露采，储量丰富，矿石具有中铝、高铁、高Al／Si比、低硫等特点。矿石的绝大部分由硬水铝石、针铁矿、赤铁矿和高岭石组成，含量约占85％，其它矿物含量甚少。是国内罕见的能运用拜耳法生产氧化铝的优质新型铝土矿资源。 相似文献
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DS1试样主要化学成分为Al2O3 64.31%,SiO2 8.92%,A/S 7.11,TS 0.30%;该试样经焙烧-湿法预脱硅处理后,A/S由7.11提高到26.37,Al2O3由63.41%升高到78.53%,TS从0.30%降低到0.11%;焙砂在温度280℃,时间60 min,配料比αk 1.45,碱浓度为220 g/l,石灰添加量4%的最佳溶出条件下,Al2O3的绝对溶出率为95.52%,相对溶出率99.59%;Ga的溶出率91.63%,溶出物在1100℃下锻烧2 h,可获得Al2O3>99%,其他各项指标均优于YS/T274-1998AO-1行业标准的氧化铝产品。 相似文献
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渭北铝土矿带是陕西省两大铝土矿带之一。矿床产于下古生界碳酸盐岩不整合面上,为岩溶型铝土矿。矿体形态有似层状、透镜状和漏斗状,空间展布严格受基底古岩溶地形的控制。矿石类型属于一水硬铝石型铝矿,主要呈碎屑状、豆鲕状和泥状结构,致密块状和层状构造。矿石主要化学成分有:Al2O3、SiO2、Fe2O3、TiO2,Al2O3平均含量为55.05%～64.97%,SiO2平均含量为12.44%～15.16%,A/S平均为3.63～5.22。矿床受沉积间断、古气候、古纬度和古地形等因素控制。与我国主要铝土矿成矿区——河南、山西相类比,渭北地区具有相似的成矿地质和古气候条件,找矿前景较好,但以低品位矿石为主。 相似文献
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以广西平果县太平铝土矿区外围的矿石为研究对象,采用化学分析、X射线粉晶衍射、光学显微鉴定、X射线能谱分析等方法对矿石的化学组成、矿物组成、矿物嵌布特征等进行了系统研究。结果表明,太平矿区外围铝土矿属于高铁的一水硬铝石型铝土矿,其中Al_2O_3含量为53. 06%,A/S值为10. 74,适用于拜耳法回收;共伴生组分中Fe_2O_3、Ti O_2、Ga、Nb达到综合回收利用指标。矿石选冶回收的目标元素Al主要以一水硬铝石、三水铝石的形式存在,平衡配分占比分别为85. 9%、6. 73%。矿石复杂的结构构造、矿物嵌布粒度、矿石中Fe、Si等元素不均匀分布等因素对Al的选冶回收有一定的影响。 相似文献
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贵州道真新民铝土矿床属于典型的古风化壳沉积型矿床,矿体主要呈层状、似层状产出,受地层控制明显,后期断裂构造破坏了地表矿体的连续性。矿石主要构成矿物为一水硬铝石、一水软铝石和高岭石。铝土矿石的主要化学组分为Al2O3、Si O2、Fe2O3和Ti O2,w(Al2O3)为31.26%~78.38%,w(Si O2)为1.06%~47.37%,w(Fe2O3)为1.21%~14.01%,w(Ti O2)为0.75%~3.08%。矿石中Cd、Li、Cr、Pb和Ga具有较高程度的富集,而Be、Sc为弱富集元素,其余元素呈不同程度的贫化(亏损)。Li、Ge和Ga在矿体中富集程度高,w(Ga)为23×10-6~119.74×10-6,平均55.24×10-6,高于铝土矿伴生元素工业指标20×10-6近一倍。矿石中稀土总量介于22.01×10-6~6339.18×10-6,具有轻稀土富集和轻、重稀土明显分异特征;矿石中Eu呈负异常,Ce呈正异常;稀散稀有元素可能以矿物质的形式存在于含铝矿物中,与铝同步迁移富集。与上覆栖霞组灰岩及下伏黄龙组灰岩或韩家店组泥岩或钙质粘土岩相比,铝土矿石与韩家店组泥岩具有相似的稀土配分模式和Eu、Ce异常特征,暗示韩家店组泥岩可能是铝土矿的成矿母岩。 相似文献
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实验研究了采用两步碱溶法从高铝粉煤灰中提取氢氧化铝的可行性。首先采用浓度为8 mol/L的NaOH溶液,在95℃的条件下溶出高铝粉煤灰中部分非晶态SiO2;所得脱硅粉煤灰再与适量CaO混合均匀,在260~280℃下以浓度18~20 mol/L的NaOH溶液溶出Al2O3,得到高苛性比的铝酸钠溶液;经降低苛性比、脱硅和碳酸化分解,制得氢氧化铝制品。化学成分分析结果表明,该氢氧化铝制品符合GB/T 4294-1997规定的一级标准。与其他从高铝粉煤灰中提取氧化铝的工艺相比,该方法避免了粉煤灰原料的高温烧结过程,生产能耗显著降低,加工过程的环境相容性良好。 相似文献
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我国对铝土矿的质量标准主要有两个指标 :Al2 O3 >4 0 % ,A/S (Al2 O3 /SiO2 ) >1 8～ 2 6 ,达到这两项标准的含铝岩石称作铝土矿。在山西省符合上述标准的铝土矿资源包括通常意义上的铝土矿资源和高铝粘土矿资源。1 山西省铝土矿资源特征1 1 资源丰富 ,储量较大山西省是铝土矿资源大省 ,截至 2 0 0 0年底 ,全省经过地质勘查的铝土矿和高铝粘土矿区共有 92处 ,保有资源量 1 0 90 2 4 50万吨。其中 ,铝土矿矿区 71处 ,保有储量936 73 90万吨 ,累计探明储量 9541 3 80万吨 ,探明储量占全国总储量的 4 1 6 3% ,居全国首位 ;高铝粘土… 相似文献
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Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
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Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
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Chronological analyses of correlations between certain global repeating events (mass extinctions of marine organisms, meteorite impacts, and flashes in the frequency of geomagnetic reversals) during the Phanerozoic Eon and the motion of the solar system in the Galaxy are presented for five rotationally symmetrical models for the regular Galactic gravitational field. Thirteen of sixteen mass-extinction events can be described by a repetition interval of 183±3 million years. This is in agreement with the anomalistic period (interval between two subsequent passages of the Sun through the apocenter of its Galactic orbit) in the model of Allen and Martos. The positions of the minima and maxima in Gaussian functions approximating the frequency distribution for geomagnetic reversals also agree with the times of passage of the Sun through the apocenter and pericenter, respectively, of its Galactic orbit in this model. The maximum in the distribution of the deviations of the dates of mass extinctions from the nearest dates of impacts of large, crater-forming bodies is close to zero, providing evidence that many such events are correlated. As a rule, extinctions follow impact events. The impacts of large bodies have occurred most often when the solar system passes through the Galactic plane, while mass extinctions occur more often at some distance from the Galactic plane (about 40 pc). As a rule, intervals of increases in the frequency of geomagnetic reversals coincide with dates of impacts of large bodies. At the same time, these intervals do not show a clear correlation with the dates of mass extinctions. The intensity of mass extinctions, like the energy released by impacts, is consistently higher in periods when the Sun is moving from the apocenter toward the pericenter of its orbit, than when it is moving from the pericenter toward the apocenter. Thus, there is evidence for a variety of relationships between repeating global events in the Phanerozoic and the motion of the Sun in the Galaxy. Long-period variations in the frequency of geomagnetic reversals are correlated with the orbital motion of the Sun, and increases in the frequency of geomagnetic reversals are correlated with impacts. Mass extinctions are correlated with the impacts of large bodies, whose motions may have been perturbed by clouds of interstellar material concentrated toward the Galactic plane and by the shock front associated with the Perseus spiral arm, through which the solar system passes. The velocity of the Sun relative to the spiral pattern is estimated. 相似文献
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位于华北和扬子两板块碰撞带中的苏鲁榴辉岩形成的温压条件不但是超高压，而且是高温。榴辉岩的PTt轨迹表明其为陆-陆磁撞俯冲带的产物。榴辉岩的区域性围岩花岗质片麻岩为新元古代同碰撞期花岗岩，榴辉岩及其他直接围岩皆呈包体存在于其中，并见新元古代花岗岩呈脉状侵入榴辉岩包体中。区域性围岩新元古代花岗岩的锆石中发现有柯石英、绿辉石等包裹体，表明新元古代花岗岩的组成物质也经受过超高压变质作用，且榴辉岩与围岩新元古代花岗岩的锆石U-Pb体系同位素年龄基本相同。但新元古代花岗岩所记录的变质作用和变形作用期次（或阶段）却少于榴辉岩。椐上述可得如下推断：超高压榴辉岩与新元古代花岗岩岩浆是同时在碰撞带底部（俯冲板块前部）形成的；榴辉岩的第一折返阶段是由新元古代花岗岩岩浆携带上升的，其第二折返阶段是和新元古代花岗岩一起由逆冲及区域性隆起而上升，遭受剥蚀。 相似文献
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某高速公路下伏煤矿采空区稳定性分析 总被引：10，自引：0，他引：10
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。 相似文献
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摩擦桩基桩土间极限摩阻力取值问题探讨 总被引：1，自引：0，他引：1
通过对广珠东线高速公路横沥大桥的试桩及土体的工程地质条件分析,总结出影响摩擦桩基桩土间极限摩阻力取值的一般问题以及解决问题的方法和措施。 相似文献
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The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献
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The structure of the eastern Pyrenees consists mainly of south-directed thrusts involving basement and cover rocks. An antiformal stack developed by the piling up of basement thrust sheets which outcrop in the Axial zone. These structures account for a thin-skinned thrust model rather than a vertical fault model in which the Axial zone would be essentially autochthonous, and the North-Pyrenean fault the axial plane of a fan thrust system. New data from the Eastern Pyrenees and the thin-skinned model suggest that(1) the structure east of the Pedraforca nappe is similar to that of the Central Pyrenees; (2) the cover rocks of the South-Pyrenean units and of the Axial zone-after restoration—built up a northwards-thickening prism consistent with the existence of a unique Pyrenean sedimentary basin during Mesozoic time; (3) the Axial zone is only a complex antiformal stack developed as a part of South-Pyrenean system related to the Paleogene thrusting-tectonics. The Axial zone palaeogeographic area had no special meaning during Mesozoic time. 相似文献