硫脲浸取—光度法测定硫化矿中金

常温下在Ｈ２Ｃ２Ｏ４－Ｈ２ＳＯ４介绍中,用５０ｇ／Ｌ硫脲（Ｔｕ）溶液可完全浸提含金硫化矿中Ａｕ,对金的浸取率可达９９．８％,然后作用ＣＬ－Ｐ２０４萃淋树脂事集含金分解液中Ａｕ（Ｔｕ）２＾＋,结晶紫分光度法测定。方法用于硫化原生矿及含硫浮选精矿中Ａｕ的测定,所得结果与王水分解原子吸收法测定相符,其ＲＳＤ（ｎ＝５）〈３％。     

含铂尾渣的分解及其测定

本文提出灼烧－盐酸浸取预分离干扰元素,以盐酸、双氧水加入助溶剂（Ｘ－１）分解样品,用分光光度法测定铂。线性范围０～５．０μｇ／ｍＬ,相关系数为０．９９９６,加入标准回收率为９８％以上。     

极谱法测定钼矿石中的总钼氧化钼硫化钼

钼的物相分析要求测定硫化矿物相和氧化矿物相,常用比色法和电感耦合等离子体发射光谱法等对辉钼矿、钼华矿、钼钨钙矿、钼酸铅矿等钼矿石进行物相分析,但分离物相的品种较多,方法繁琐耗时.本文用王水-硫酸消解钼矿石样品,碱溶液复溶浸提得到钼总量,使其他大多数元素形成沉淀而分离,用碳酸钠-氢氧化铵混合溶液浸取钼的氧化矿物,将残渣进一步溶解得到硫化矿物含量,在硫酸-氯酸钾-二苯羟乙酸体系中用极谱法简单快速测定钼总量、氧化钼和硫化钼含量.方法的线性范围为0.04～0.4 mg/L,检出限为0.028 mg/L.对三种钼矿样品进行物相分析,氧化矿物与硫化矿物含量的加和与钼总量相当;总钼、氧化钼、硫化钼测定结果的相对标准偏差在1.69％ ～3.56％之间,与比色法测定结果相符.方法实用快速,易于推广,适于实际批量样品的测试.     

红土型铝土矿中三水铝石的分离方法研究

研究了非水溶剂体系作为分离红土型铝土矿中三水铝石的选择性溶剂的优越性及其具体应用条件。实验表明，１ｍｏｌ／ＬＫＯＨ－０．３％水杨酸－无水乙醇溶液于沸水浴上浸取分离，可使该矿中高含量的三水铝石完全溶解，其浸出率＞９９％；而共存的一水硬铝的溶解率＜０．６，高岭石的溶解反应受到了明显的抑制，其最大溶解率从３０．５５％降至５．８６％。方法用于实际样品分析，获得了比较满意的结果。     

锑矿石化学物相分析方法选择性分离条件验证及准确度评估

目前我国矿石化学物相分析方法,除少数方法具有较广泛的适应性外,多数方法均是针对某一具体矿区的样品而制定,在实际应用中无法确认分析结果的准确性和选择性分离流程的适应范围。验证化学物相分析方法的选择性分离流程及方法准确度是该领域必须解决的问题。本文以我国具有代表性的锑矿类型——单锑硫化矿为研究对象,通过岩矿鉴定确定锑的主要矿物相,从试验样品中挑选验证选择分离条件所需的单矿物,在无法获得锑华单矿物的情况下,通过价态分析确定了锑华与锑酸盐混合物中锑华的比例,并通过系列单矿物选择分离对比条件试验和X射线衍射分析,确定了锑华、辉锑矿和锑酸盐等锑物相的选择性分离条件。结果表明:对于硫化锑含量大于35%的样品,锑硫化相的选择浸出时间从传统的30 min调整为40 min,硫化锑的浸出率提高了4%~6%,硫化锑相对于锑酸盐的串相率降低了45%~70%,硫化锑相浸出完全,提高了硫化锑和黄锑矿相分析的准确度。该方法适用于不同地区、不同类型(氧化矿、硫化矿)锑矿石样品的锑化学物相分析。     

某钒矿石提钒工艺试验的比较研究

对某地钒矿石进行了成份分析、赋存状态的分析,证实了该矿石含20%以上的钒云母。为了提高该矿钒的浸出率,研究了盐酸浸取、硫酸浸取、未经焙烧样品的浸取、焙烧后样品的浸取、添加剂的用量对浸出的影响、焙烧温度及浸取时间等对浸出率的影响。建立了无盐焙烧、稀硫酸浸取,使浸出率达90%以上,为后续工业设计和生产提供了可靠的数据和依据。     

大洋锰结核中钴的赋存状态及提取实验研究

为合理有效地提取和利用大洋金属资源,在对大洋锰结核化学成分及矿物组成进行测定的基础上,采用分布溶解法对钴的赋存状态进行了分析.选择还原氨浸法对大洋锰结核中的多金属进行了浸取实验,并用铵黄铁矾法对浸取液进行了除铁及用硫化沉淀法对钴进行分离提取等实验.结果表明:大洋锰结核中钴的质量分数可达0.30%,且主要以硅酸钴、氧化钴和硫化钴的形式存在.氨浸提取可以有效地使金属离子从结核中溶出,其中钴的浸出率最高可达93.25%;铵黄铁矾法可将浸出液中的铁全部去除.提取的硫化钴中除含有少量铬外未见其它杂质元素.     

四川某难浸金矿的矿石性质研究

四川某金矿是一种难浸金矿，因为矿石中的金被包裹于含铁硫化矿物中，而且含有机炭质物。细菌Hst能有效氧化金矿中的硫化矿物以提高金的浸出率。如果细菌氧化矿石中铁的浸出率大于90％，金几乎完全解离，金的氰化浸出率大于90％。研究表明，该金矿的难浸特性是因为金包裹于含铁硫化矿物中，有机炭质物和粘土矿物对金浸出影响甚微。     

直接酸溶法浸取硫铁矿烧渣中铁的实验研究

对常压下用盐酸直接酸溶提取硫铁矿烧渣中的铁进行了实验研究，探讨了影响硫铁矿烧渣酸溶的因素。结果表明，影响铁溶出率的主要因素为液固比、反应时间和温度；当液固比为4．0mL／g、反应温度100℃时，高速搅拌反应2h后，铁的溶出率可达72％，浸取液经进一步处理可生产氯化铁系列产品，有较好的应用前景。     

粘土矿物中嵌晶态硅酸钴的浸取实验研究

系统地研究了用 Ｎ Ｈ４ Ｈ Ｆ２ 和柠檬酸浸取粘土矿物中嵌晶态硅酸钴的新方法。实验过程中对浸取剂的用量、水浴时间、温度等影响因素进行了正交实验设计,选出了最佳的浸取条件。结果表明,该方法浸取粘土矿物中嵌晶态硅酸钴的浸出率达 ９６０５％ 以上,相对标准偏差为１２２％ 。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

NONMETALS DEPOSITS

正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.)     

MATHEMATICAL GEOLOGY

正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology,     

PROSPECTING EXPLORATION

正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.)     

STRUCTURAL GEOLOGY

正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se-     

STRUCTURAL GEOLOGY

正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with