發(fā)布時間：2018-04-16 23:14

  本文選題：鈾成礦 + 吸附作用�。� 參考：《東華理工大學(xué)》2016年碩士論文

【摘要】：相山鄒家山礦床礦石尤其是富礦石中大量富集有磷灰石、金紅石、黃鐵礦、水云母、石英、粘土等礦物。對鈾礦石的化學(xué)成分分析也顯示出,富鈾礦石中U與Ti O2,P2O5,Mg O,Mn O,Ca O,Fe2O3等成分成顯著正相關(guān)關(guān)系。這些伴生礦物有自形的,也有非自形的。鈾大量分布于這些伴生礦物的外圍或充填于其裂隙中。由此可知,鈾可被伴生礦物吸附而沉淀下來,進(jìn)而富集成礦。因此,吸附作用在鈾沉淀及富集成礦過程中起到重要作用。本文在系統(tǒng)研究鄒家山礦床礦體產(chǎn)狀,貧、富礦石的巖相特征,成分特征,鈾礦物賦存狀態(tài)以及與各伴生礦物的空間關(guān)系后,開展了在不同物理化學(xué)條件下伴生礦物對鈾的吸附實驗。實驗采用靜態(tài)法,將吸附量或吸附分配系數(shù)作為狀態(tài)函數(shù),p H、離子強(qiáng)度、吸附質(zhì)濃度、吸附時間等作為自變量,通過控制自變量獲得吸附與這些自變量的關(guān)系。通過以上研究,取得了下列認(rèn)識:1、鄒家山鈾礦床中,賦存有大量磷灰石、黃鐵礦、金紅石、綠泥石、水云母、螢石等,這些伴生礦物有自形的,也有非自形的,鈾礦物大量分布于這些礦物的邊緣,裂隙和解理面中。通過對礦石化學(xué)成分分析發(fā)現(xiàn),U與Ti O2,P2O5,Mg O,Mn O,Ca O,Fe2O3等成分不同程度的呈正相關(guān)關(guān)系。由此可知,鈾礦物的形成與金紅石、銳鈦礦、磷灰石、綠泥石、螢石、黃鐵礦等礦物關(guān)系密切,且這些伴生礦物先期形成,鈾后被吸附而沉淀下來。2、開展了磷灰石、金紅石以及微晶石英等與鈾礦物密切伴生礦物對鈾的吸附實驗,實驗均在常壓下進(jìn)行�？芍�,(1)p H=2.5時,磷灰石在10 min對鈾的吸附可達(dá)最大吸附量94.3 mg/g。(2)p H=4.5時,金紅石在10min對鈾的吸附可達(dá)最大吸附量57.38 mg/g。(3)酸性條件下,隨著p H增大,微晶石英對鈾的吸附量逐漸增大。在4h后反應(yīng)趨于平衡。(4)分別對吸附前后的磷灰石、金紅石及微晶石英進(jìn)行分析。XRD、SEM、BSE和EDS測試均顯示,在吸附過程中,鈾呈非晶質(zhì)吸附在磷灰石、金紅石及微晶石英上,無新的礦物相形成。3、結(jié)合宏觀地質(zhì)事實和實驗結(jié)果,顯示出多種伴生礦物對鈾的最佳吸附條件與鄒家山礦床富大鈾礦形成的條件近乎一致。由此可知,當(dāng)具有吸附性能的伴生礦物、含鈾熱液、酸性-弱酸性環(huán)境、足夠的成礦空間等多種因素相耦合,有利于形成富大鈾礦。研究顯示吸附作用在熱液型鈾礦床成礦過程中意義重大。
[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.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P619.14

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