邹家山矿床铀成矿作用的实验研究

发布时间：2018-04-16 23:14

本文选题：铀成矿 + 吸附作用　；参考：《东华理工大学》2016年硕士论文

【摘要】：相山邹家山矿床矿石尤其是富矿石中大量富集有磷灰石、金红石、黄铁矿、水云母、石英、粘土等矿物。对铀矿石的化学成分分析也显示出,富铀矿石中U与Ti O2,P2O5,Mg O,Mn O,Ca O,Fe2O3等成分成显著正相关关系。这些伴生矿物有自形的,也有非自形的。铀大量分布于这些伴生矿物的外围或充填于其裂隙中。由此可知,铀可被伴生矿物吸附而沉淀下来,进而富集成矿。因此,吸附作用在铀沉淀及富集成矿过程中起到重要作用。本文在系统研究邹家山矿床矿体产状,贫、富矿石的岩相特征,成分特征,铀矿物赋存状态以及与各伴生矿物的空间关系后,开展了在不同物理化学条件下伴生矿物对铀的吸附实验。实验采用静态法,将吸附量或吸附分配系数作为状态函数,p H、离子强度、吸附质浓度、吸附时间等作为自变量,通过控制自变量获得吸附与这些自变量的关系。通过以上研究,取得了下列认识:1、邹家山铀矿床中,赋存有大量磷灰石、黄铁矿、金红石、绿泥石、水云母、萤石等,这些伴生矿物有自形的,也有非自形的,铀矿物大量分布于这些矿物的边缘,裂隙和解理面中。通过对矿石化学成分分析发现,U与Ti O2,P2O5,Mg O,Mn O,Ca O,Fe2O3等成分不同程度的呈正相关关系。由此可知,铀矿物的形成与金红石、锐钛矿、磷灰石、绿泥石、萤石、黄铁矿等矿物关系密切,且这些伴生矿物先期形成,铀后被吸附而沉淀下来。2、开展了磷灰石、金红石以及微晶石英等与铀矿物密切伴生矿物对铀的吸附实验,实验均在常压下进行。可知,(1)p H=2.5时,磷灰石在10 min对铀的吸附可达最大吸附量94.3 mg/g。(2)p H=4.5时,金红石在10min对铀的吸附可达最大吸附量57.38 mg/g。(3)酸性条件下,随着p H增大,微晶石英对铀的吸附量逐渐增大。在4h后反应趋于平衡。(4)分别对吸附前后的磷灰石、金红石及微晶石英进行分析。XRD、SEM、BSE和EDS测试均显示,在吸附过程中,铀呈非晶质吸附在磷灰石、金红石及微晶石英上,无新的矿物相形成。3、结合宏观地质事实和实验结果,显示出多种伴生矿物对铀的最佳吸附条件与邹家山矿床富大铀矿形成的条件近乎一致。由此可知,当具有吸附性能的伴生矿物、含铀热液、酸性-弱酸性环境、足够的成矿空间等多种因素相耦合,有利于形成富大铀矿。研究显示吸附作用在热液型铀矿床成矿过程中意义重大。
[Abstract]:The ore of Xiangshan Zoujiashan deposit is rich in apatite, rutile, pyrite, hydromica, quartz, clay and so on.The chemical composition analysis of uranium ores also shows that there is a significant positive correlation between U and TIO _ 2O _ 2P _ 2O _ 5mg O _ 2O _ 5, mn, O _ 2O _ 3, Fe _ 2O _ 3 and so on.These associated minerals are either self-shaped or non-automorphic.Uranium is abundant in the periphery of these associated minerals or filled in its fractures.It can be concluded that uranium can be adsorbed by associated minerals and precipitated and enriched.Therefore, adsorption plays an important role in the process of uranium precipitation and enrichment.In this paper, the lithofacies characteristics, composition characteristics, occurrence state of uranium minerals and the spatial relationship between the occurrence, poor and rich ores of the Zoujiashan ore body and the associated minerals are systematically studied.Experiments on the adsorption of uranium by associated minerals under different physicochemical conditions were carried out.The static method is used. The adsorption capacity or the adsorption partition coefficient is taken as the state function, ion strength, adsorption concentration, adsorption time and so on as independent variables, and the relationship between adsorption and these independent variables is obtained by controlling the independent variables.Through the above research, we have obtained the following understanding: there are a large number of apatite, pyrite, rutile, chlorite, hydromica, fluorite and so on in the W 1, Zoujiashan uranium deposit. These associated minerals are either self-shaped or non-automorphic.Uranium deposits are widely distributed on the edges of these minerals and in the fissure and settlement planes.By analyzing the chemical composition of the ore, it is found that there is a positive correlation between the U and the composition of TIO _ 2O _ 2P _ 2O _ 5, mg, O _ 2O _ 5, mn, O, Ca, O, Fe _ 2O _ 3 and so on.Therefore, the formation of uranium minerals is closely related to the minerals such as rutile, anatase, apatite, chlorite, fluorite, pyrite, etc.The adsorption experiments of rutile and microcrystalline minerals closely associated with uranium ore are carried out under normal pressure.The results show that the maximum adsorption capacity of uranium for apatite is 94.3 mg/g.(2)p H4. 5 for apatite at 10 min, and for rutile at 57.38 mg / g 路m3) acidity for 10min. With the increase of pH, the amount of uranium adsorbed by microcrystalline stone increases with the increase of pH.BSE and EDS tests of apatite, rutile and microcrystalline stone before and after adsorption showed that uranium was adsorbed on apatite, rutile and microcrystalline stone.No new mineral facies formed .3. combined with macroscopic geological facts and experimental results, it is shown that the optimum conditions for uranium adsorption by various associated minerals are almost identical to those for the formation of large uranium deposits in Zoujiashan deposit.It can be concluded that when the associated minerals with adsorptive properties, uranium-bearing hydrothermal solution, acid-weak acidic environment, sufficient ore-forming space and other factors are coupled together, it is advantageous to form a large uranium deposit.The study shows that adsorption is of great significance in the metallogenic process of hydrothermal uranium deposits.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P619.14

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