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华东某铀矿区稻米中Cd含量及空间分布特征研究 总被引：2，自引：0，他引：2
利用等离子体质谱仪测定了某铀矿区周边稻米与对照区稻米中重金属元素Cd的含量,重点对铀矿区稻米中的Cd元素含量及其空间分布特征进行了研究。结果表明:(1)铀矿区内10.53%的稻米样品Cd含量超过国家标准,89.47%稻米样品中Cd的含量未超过国家标准(GB 2762-2005),而对照区稻米样品中Cd含量均远低于国家标准(GB 2762-2005);(2)铀矿区稻米中Cd含量远高于对照区稻米中Cd含量,尾矿堆积区、水冶厂和矿床开采区下游及周边区域内稻米中Cd元素含量明显高于上游地区或远离上述区域的其他地区。(3)矿床开采产生的废水与废渣、水冶厂的废液渗漏、尾矿露天堆积以及矿石运输过程中的矿渣洒落等原因可能是导致Cd元素随地表径流发生迁移进入稻田,从而使矿区稻米中Cd的含量较高的重要因素。 相似文献
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矿石工艺类型是指按矿石工艺性质,主要是矿石选矿工艺性质的差别,对矿石所作的分类.它以矿石物质成分的研究为基础,以为制定选冶工艺流程提供可靠依据为目的.矿石工艺类型通常是在矿石自然类型的基础上细分而成,它与矿石工业类型有时相似,有时又不同. “矿石工艺类型”一词主要适用于选矿学,是选矿学的重要组成部分之一.本文从应用地质学的角度提出研究矿石工艺类型的重要性.如所周知,矿石是一定地质作用下的产物,其工艺性质上的差异是由于成矿地 相似文献
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十红滩铀矿床矿石铀价态分析与浸取试验研究及其地质意义 总被引：3，自引：0，他引：3
本分析了采自十红滩铀矿床31线和39线勘探剖面中10个矿石样品的铀含量和铀价态，并对其中具代表性的两个矿石样品进行了浸取试验。矿石样品的U^4 ／U^6 比值较大的变化范围(0．82～1．81)，表明了矿石中铀价态的多样性和赋存状态的复杂性。在基本达到浸取平衡的条件下，浸出率曲线在不同浸取液浓度、不同浸泡时间和不同氧化条件下，呈现较好的变化规律，据此可半定量确定矿石中的活性铀与可溶性铀的含量。结合矿床地质和矿石特征，认为十红滩铀矿床矿石中的铀主要以分散吸附状态存在，从试验的角度证实了其具有可浸取性。 相似文献
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化学风化作用,使滇池地区下寒武统磷块岩形成大面积风化矿石,矿石构造疏松,可以通过简单的擦洗-脱泥使精矿品位有较大的提高。选矿试验结果证实,只有自然粒度擦洗才是合理的选矿工艺。根据自然粒度擦洗结果书风化磷块岩划分为“制酸矿”、“擦洗制酸矿”和“非制酸矿”3种“工业类型”。其原矿石分别出自不同的沉积古地理环境,且有不同的岩石学和岩石化学特征,据此可以通过原矿对风化磷块岩的擦洗结果进行预测。 相似文献
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伴生银矿石的工艺类型及其可选性特征（上） 总被引：1，自引：0，他引：1
根据有色金属矿床伴生银矿石中有用元素的赋存状态与分配、有用矿物的粒度和嵌布形态特征等工艺性质,提出了划分伴生银矿石工艺类型的依据,初步将伴生银矿石划分为伴生银铅锌矿石、伴生银铜矿石和伴生银钨锡矿石三大系列,并系统地研究各系列伴生银矿石的工艺特征,提出了按矿石工艺类型,选择合理的选矿工艺流程,确定或预测合理的选矿回收指标,达到提高伴生银选矿回收率,提高矿山开发经济效益的目的。 相似文献
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铵盐作调整剂在矿石浮选中的应用研究现状 总被引：4，自引：0，他引：4
铵盐作调整剂在矿石浮选中的应用研究现状张文彬徐晓军冷崇燕（昆明理工大学，昆明６５００９３）关键词浮选铵盐选矿调整剂根据不同矿石的工艺矿物学特征，用铵盐作为调整剂，提高矿石浮选或分离效果，已在矿石浮选中得到较为广泛的应用。１铵盐在氧化铜矿浮选中的应用东... 相似文献
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攀西钒钛磁铁矿是一种含有多种有益元素的多金属共生矿,其铁品位在21—30之间,属中贫矿石。具不均匀浸染的矿石构造。本文论述了钒钛磁铁矿矿石矿物:钛磁铁矿、粒状钛铁矿、各种硫化物的选矿工艺特征。介绍了采用粗粒抛尾选矿工艺的依据,优越性及经济效益。本文还讨论了矿石品位、矿石类型、磨矿粒度、磁场强度对粗粒抛尾选矿工艺的影响。 相似文献
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相山铀矿田稀土元素地球化学特征及示踪研究 总被引：2，自引：0，他引：2
廖宇华 《华东地质学院学报》2000,23(2):150-153
相山铀矿田我国著名的火山岩型热液铀矿田,作者对矿田4个有代表性的铀矿床的赋矿主岩、铀矿石,沥青铀矿样品稀土元素地球化学特征进行了研究,探讨了其成岩,成矿的物质来源,提示了两种不同地球化学类型铀矿床的稀土元素与铀矿化呈正消长关系,尤其是富矿床中铀与重稀土元素,主要来自深部原生流体,并呈现出共沉淀的特点,含铀热液分异演化愈强,则铀矿化愈富。 相似文献
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江山铅锌金矿选矿试验研究 总被引：1，自引：0，他引：1
针对江山铅锌金矿品位低,矿物组成复杂的特点,采用"铅-锌-硫优先浮选,硫(金)精矿氧化焙烧预处理-焙砂氰化浸金"的工艺,金在铅(金)精矿、锌精矿、硫(金)精矿中的总回收率为81.25%。可使硫(金)精矿中96.89%的硫以二氧化硫的形式得到回收,对原矿的回收率为73.25%;金的作业浸出率达84.76%,对原矿的回收率为31.91%;浸渣中的铁品位达57.99%,对原矿的回收率为26.71%。通过试验研究与分析,确定适宜的选矿工艺及药剂制度,为今后合理开发该区矿石提供技术依据。 相似文献
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Precambrian iron ores of the Singhbhum-North Orissa region occur in eastern India as part of the Iron Ore Group (IOG) within the broad horse-shoe shaped synclinorium. More than 50% of Indian iron ore reserves occur in this region. Massive-hard, flaky-friable, blue dust and lateritic varieties of iron ores are the major ore types, associated with banded hematite, jasper and shales. These ores could have formed as a result of supergene enrichment through gradual but extensive removal of silica, alumina and phosphorus from banded iron formations and ferruginous shale. Attempts for optimal utilization of these resources led to various ore characterization studies using chemical analysis, ore and mineral petrography, XRD analysis, SEM and electron probe micro analysis (EPMA). The ore chemistry indicates that the massive hard ores and blue dust have high iron, low alumina and phosphorus contents. Because of high quality, these ores do not require any specialized beneficiation technique for up-gradation. However, flaky-friable, lateritised and goethitic ores are low in iron, high in alumina and phosphorus contents, requiring specific beneficiation techniques for up-gradation in quality. XRD, SEM and ore microscopic studies of massive hard ores indicate the presence of hematite and goethite, while flaky and lateritic ores show a higher concentration of goethite, kaolinite, gibbsite and hematite. EPMA studies show the presence of adsorbed phosphorous as fine dust in the hard ores. Sink and float studies reveal that most of the gangue minerals are not completely liberated in the case of goethitic and lateritic ores, even at finer fractions. 相似文献
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This study reports major, minor, and trace element data and Sr isotope ratios for 11 uranium ore (uraninite, UO2+x) samples and one processed uranium ore concentrate (UOC) from various U.S. deposits. The uraninite investigated represent ores formed via different modes of mineralization (e.g., high- and low-temperature) and within various geological contexts, which include magmatic pegmatites, metamorphic rocks, sandstone-hosted, and roll front deposits. In situ trace element data obtained by laser ablation-ICP-MS and bulk sample Sr isotopic ratios for uraninite samples investigated here indicate distinct signatures that are highly dependent on the mode of mineralization and host rock geology. Relative to their high-temperature counterparts, low-temperature uranium ores record high U/Th ratios (>1000), low total rare earth element (REE) abundances (<1 wt%), high contents (>300 ppm) of first row transition metals (Sc, Ti, V, Cr, Mn, Co, Ni), and radiogenic 87Sr/86Sr ratios (>0.7200). Comparison of chondrite normalized REE patterns between uraninite and corresponding processed UOC from the same locality indicates identical patterns at different absolute concentrations. This result ultimately confirms the importance of establishing geochemical signatures of raw, uranium ore materials for attribution purposes in the forensic analysis of intercepted nuclear materials. 相似文献
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位处华北板块北缘东段的辽吉裂谷带内发育有多处中、小型铅锌矿床,其中,同时发育层状和脉状铅锌矿的青城子矿床是典型的代表。为了探讨青城子层状铅锌矿和脉状铅锌矿矿质来源及成因的异同及其所代表的地质意义,利用ICP-MS对层状铅锌矿及其围岩、脉状铅锌矿及其围岩和后期穿矿脉岩进行了稀土元素测试。结果表明,所有样品均具有轻稀土元素（LREE）富集和明显分异的特点。层状铅锌矿及其围岩具有Eu正异常和较弱的Ce负异常,表明其成矿物质均来自上升的深部热水流体与海水的混合热液,在高温、还原流体和海水的参与下成矿。脉状铅锌矿及其围岩稀土元素配分模式与层状铅锌矿及其围岩相似,但其Eu为负异常和Ce异常不明显,部分样品出现较弱的Ce正异常,对比分析穿矿脉岩明显的Eu负异常和Ce正异常以及二者稀土元素总量稍大于层状铅锌矿的特点,文章认为青城子层状矿石为沉积成矿,成矿热液为深部热水流体与海水的混合热液,但后期受到岩浆侵入叠加改造的影响而在局部形成脉状铅锌矿体,引起了Eu负异常和局部Ce正异常的出现以及稀土元素总量的增加。 相似文献
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目前国内外没有以稀散元素锗、铟为特征元素的矿石标准物质,为了满足我国地质找矿的需求,本文采集广东省韶关凡口铅锌矿作为锗矿石候选物,广西南丹铜坑铅锌矿作为铟矿石候选物,依据国家一级标准物质技术规范,由10家实验室采用化学分析方法和现代仪器分析方法协作定值,研制了1种锗矿石标准物质(GBW07831)和1种铟矿石标准物质(GBW07833)。锗矿石标准物质定值组分为45项,铟矿石标准物质定值组分为47项,包括特征元素、共存元素、稀土元素(15项)、造岩元素和痕量元素,其中锗矿石中锗含量为21.6×10-6,铟矿石中铟含量为39.7×10-6。研制的2种标准物质丰富了我国矿石标准物质的种类,可用于锗、铟矿石化学成分分析测试的量值标准和日常质量监控。 相似文献
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Exploitation of low-grade iron ore would be quite unique in a South African context as South Africa is well endowed with
high-grade iron ore resources. Low-grade iron ore, defined as containing between 20 and 47% iron, is thought to be the primary
iron-bearing lithology from which most high-grade ore deposits formed, through different processes of enrichment. The low-grade
iron ores in the Northern Province represent meta-banded iron formations (BIFs), with an average iron content of about 36%.
The main iron-bearing mineral is magnetite. The Northern Province ores have to be milled to sizes smaller than 150 μm in order
to liberate the iron minerals from the host rock, and beneficiation is accomplished through a series of magnetic separation
processes. Irrespective of the in situ quality of the ore, final concentrates of exceptionally good quality with more than
69% iron and very low contaminant levels can be produced. This, combined with mass yields of between 40 and 50% and iron recoveries
greater than 80%, are excellent for this type of iron ore deposit. The beneficiation products are suitable for use in iron-
and steel-making processes.
Received: 4 July 1996 / Accepted: 7 January 1997 相似文献
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The oxygen isotopic composition of uranium minerals: A review 总被引：2，自引：0，他引：2
Uranium ore is an essential material in the preparation of nuclear fuel for civilian as well as military uses. Uranium is first extracted from uranium-bearing minerals using a variety of reagents, and is precipitated from solutions as yellow cake prior to isotope enrichment processes. The disintegration of the former Eastern Bloc in the 1990s and frequent unrest in the Middle East have underscored the need for better characterizing source uranium ores for forensic and attribution purposes.The world's major deposits of U occur in several distinctly different geological environments. Fourteen principal types of U deposits and rocks with elevated uranium contents are recognized with more than 40 subtypes. Combining our own analysis and literature data, we have amassed over 250 oxygen isotope data from 13 major U-producing countries, which vary widely from − 32 to + 11‰. However, interpreting the oxygen isotopic composition of uraninite in terms of the composition of the fluid from which it precipitated, or interacted with, requires knowledge of the fractionation factor and temperature of interactions, which are not always available. Since each deposit type occurs within a unique geologic setting and is generally formed from chemically distinct fluids, the chemical compositions of the uranium ores are also distinct: uranium deposits that form in igneous rocks have higher trace element compositions relative to sandstone-hosted deposits. Our data shows that one of the most useful techniques for distinguishing between uranium ore is to use a combination of δ18O values and rare-earth elements (e.g., La/Yb ratios). These methods may allow investigators to trace uranium ore back to the source. 相似文献
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通过对该区成矿地质条件、矿带矿体产出特征、矿石质量及类型，热液活动和围岩蚀变情况的分析研究，总结出该区的矿产分布规律，控矿因素及找矿标志，指出了今后找矿的重点地段。 相似文献