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原地浸出采铀的水岩作用研究 总被引:4,自引:1,他引:4
原地浸出采铀时,含矿层会发生各种复杂的水岩作用。运用聚类分析方法研究溶浸化学全分析数据发现,除了CO3^2-和HCO3^-之外,其他组分呈正相关,而且有些组分密切正相关,说明它们的浓度变化规律很相似。根据含矿层矿物成分,分析了矿物和溶浸液之间的水岩反应,推出了反应方程式,并探讨了溶浸液中各种组分可能的来源。然后,用矿石静态浸出试验的数据对各种组分的反应速度进行了定量对比。 相似文献
115.
Stream-water samples were collected during a 4-year-period in twosmall streams, one whose catchment was ditched for forestry halfway through the sampling period and another nearby reference stream whose catchment was not ditched during this period. The main aim was to study the impact of forest ditching on stream-water quality. Whereas the artificial drainage did not change the hydrograph pattern, it had a large effect on stream hydrochemistry: the concentrations of suspended material, Mn, Ca, Mg and Al increased, theconcentrations of total organic carbon decreased, and pH increased by approximately one unit, from an average of 4.4 to 5.4. The increase in suspended material, Mn and Al concentrations is explainedby the physical mobilisation of mineral particulates/colloids from mineral soils (till) exposed on the ditch slopes beneath the peat layer, while the increase in Ca and Mg loads is explained by the release of Ca2+ and Mg2+ in exchange reactions in this same soil layer. The increase in pH and decrease in TOC concentrations after ditching are related to changes in hydrological flow paths in the catchments, and most likely to immobilisation of both hydrogen ions and humic substances in the near neutral till horizon exposed beneath the peat layer. Only the aquatic abundance of Fewas not significantly affected by the ditching. 相似文献
116.
Effect of widespread severely acidic soils on spatial features and abundance of trace elements in streams 总被引:1,自引:0,他引:1
In the coastal area of western Finland, a large number of streams are strongly acidic and contaminated with metals. The reason for this is not historical and present industrial, mining and urban activities, but a current high rate of weathering and leaching of widespread acid sulphate soils (pH 2.5–4.0) developed in artificially drained Holocene marine and lacustrine sulphide-bearing sediments. Evaluation of existing hydro- and geochemical field and experimental data revealed that: (1) cobalt, Ni and Zn are extensively leached from the acid sulphate soils and thus exist abundantly in streams affected by such soils, (2) copper and Tl are also leached abundantly from the acid sulphate soils, although not to the same extent as are Co, Ni and Zn, (3) vanadium is in general depleted and Cr only weakly enriched in streams draining ‘the average acid sulphate soil’, but they increase substantially in severely acidic streams in catchments underlain with particularly acidic soil, (4) arsenic and Pb are not leached more abundantly from the acid sulphate soils than from the common types of soils and sediments (till, glaciofluvial deposits, peat) resulting in aquatic abundance and distribution patterns unrelated to the acid sulphate soil occurrences. 相似文献
117.
本文介绍了512矿床区域地质背景、矿床基本特征、近期勘探成果、地浸效果和矿区远景评价。该矿床的成矿条件有利,属层间氧化带砂岩型,有可能发展成可地浸的、低品位的万吨级矿床,其矿田远景将更为可观。 相似文献
118.
山西省热矿水形成机制分析 总被引:1,自引:0,他引:1
本文以系统理论为指导,在深入研究地质北景的基础上,通过研究热矿水的含水介质,水动力场,水化学物和温度场的特征,划分了热矿水系统,探讨了热矿水的起源及形成机制,将山西热矿水的形成归纳为异常增温型和正常增温型两种基本模式,异常增温型又根据地质结构的不同,地下水径流条件的差异,列举了三种典型模式,最后指出了寻找热矿水的方向,开发利用热矿资源应注意的问题。 相似文献
119.
由酸雨对包气带土样的淋滤试验和浸泡试验资料表明,在岩-水相互作用的初期,硬度主要来自土中易溶盐的溶解和H ̄+、Na ̄+对上颗粒表面Ca ̄(2+)、Mg ̄(2+)、Fe ̄(2+)等的交换;在后期,硬度主要来自土中碳酸盐、铝硅酸盐的风化水解。酸雨中的酸度与土壤溶液中的碱度的中和过程,即是水中硬度的形成过程;酸雨的pH值越低,在相同作用时间内形成的硬度值越高。是硬度组分自土中迁出的主要载体;岩水作用的时间越长,硬度值也越高。 相似文献
120.
Abstract Experiments were conducted on the leaching of gold from greenstone by chloride solution under the temperature of 200-550°C and the pressure of 60 MPa. During part of the experiments, the oxygen fugacity was controlled. The results show that the leaching rate of gold is related to temperature, composition of the solution, pH and oxygen fugacity. In the experiment with oxidative acidic solution, the leaching rate was up to 50% or more. It is known that the leaching of gold is restricted by the reaction in which the gold is dissolved from the rock to form gold chloride complex. Therefore, the authors hold that the acidic chloride solution derived from granite magma has caused the remobilization-migration of gold from greenstone and its enrichment into ore. 相似文献