本文選題：巴彥烏拉鈾礦床 + 地浸過程��； 參考：《東華理工大學(xué)》2017年碩士論文

【摘要】：巴彥烏拉礦鈾床是我國在內(nèi)蒙古二連盆地開發(fā)的第一個(gè)鈾礦床,也是繼新疆伊犁盆地后又一采用酸法地浸的鈾礦山,該礦床盡管礦石鈾品位較低、含礦層厚度較大,但含礦層滲透性較好,有利于地浸開采,具有良好開發(fā)前景。隨著生產(chǎn)系統(tǒng)的運(yùn)行,逐漸出現(xiàn)注液孔注液壓力增大,即含礦層出現(xiàn)化學(xué)堵塞問題。本文針對(duì)含礦層堵塞問題,在分析含礦層礦物特征的基礎(chǔ)上,根據(jù)浸出液化學(xué)成分,運(yùn)用地球化學(xué)模式程序(PHREEQC)對(duì)浸出液—礦物平衡進(jìn)行了模擬,確定了堵塞礦物類型,分析含礦層化學(xué)堵塞形成原因與形成條件,以溶浸液及浸出液離子濃度變化為約束條件,建立了溶浸液—礦物相互作用模型,模擬溶浸液與礦物相互作用過程,計(jì)算了礦物堵塞量與體積,對(duì)注液流量與孔隙率下降進(jìn)行了對(duì)比,在此基礎(chǔ)上揭示了含礦層化學(xué)堵塞機(jī)理。研究結(jié)果表明,巴彥烏拉礦床含礦層黃鐵礦、碳酸鈣含量相對(duì)較高,當(dāng)高礦化度的強(qiáng)酸性溶浸液注入含礦層后,溶解了黃鐵礦與碳酸鈣,使溶液中Ca2+、Fe3+濃度大幅提高,特別是在氧化條件下,超過Ca2+、Fe3+平衡濃度邊界值,即其濃度反應(yīng)條件指數(shù)大于0,產(chǎn)生石膏、鐵礦物沉淀,充填礦層孔隙,使孔隙率下降,導(dǎo)致滲透性能降低,注液壓力增大,造成含礦層化學(xué)堵塞。本次模擬結(jié)果與礦床實(shí)際堵塞情況相吻合,認(rèn)為采用平衡模擬與溶浸液—礦物相互作用模擬結(jié)合探討含礦層化學(xué)堵塞機(jī)理是有效可行的。
[Abstract]:The uranium deposit of Bayan Wula deposit is the first uranium deposit developed in Erlian basin of Inner Mongolia in China. It is also a uranium ore mountain leached in situ by acid method after the Yili basin in Xinjiang. Although the uranium grade of ore is low, the ore-bearing strata are thick.But the permeability of ore-bearing bed is good, which is favorable to in situ leaching mining and has a good development prospect.With the operation of production system, the pressure of liquid injection hole increases gradually, that is, chemical blockage occurs in ore-bearing bed.In this paper, based on the analysis of mineral characteristics of ore-bearing beds, the leaching liquid-mineral balance is simulated by using the geochemical model program PHREEQC on the basis of the chemical composition of leaching fluids, and the types of blocked minerals are determined.The reason and condition of chemical clogging of ore-bearing bed are analyzed. With the change of ion concentration of leaching solution and leachate as the constraint condition, the model of leaching liquid-mineral interaction is established, and the process of interaction between leaching solution and mineral is simulated.The amount and volume of mineral plugging were calculated, and the decrease of injection flow rate and porosity were compared, and the mechanism of chemical plugging of ore-bearing beds was revealed.The results show that the ore layer pyrite and calcium carbonate content are relatively high in Bayan Wula deposit. When the strong acid leaching solution with high mineralization degree is injected into the ore bearing layer, the pyrite and calcium carbonate are dissolved, and the concentration of Ca2 + Fe 3 in the solution is greatly increased.Especially under oxidation condition, when the boundary value of equilibrium concentration of Ca2 + Fe3 is exceeded, that is, the reaction condition index of concentration is greater than 0, gypsum, iron mineral precipitate, filling pore of ore bed are produced, the porosity decreases, the permeability decreases and the injection pressure increases.Causing chemical blockages in ore-bearing beds.The results of this simulation are in agreement with the actual plugging of ore deposits. It is considered that it is effective and feasible to study the chemical plugging mechanism of ore-bearing beds by means of equilibrium simulation and leaching liquid-mineral interaction simulation.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD868

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