【摘要】：我國鈾資源開發(fā)的重點是砂巖型鈾礦,內(nèi)蒙古是我國砂巖型鈾礦開發(fā)的大基地。巴彥烏拉鈾礦床是我國第一個在內(nèi)蒙古投入生產(chǎn)的砂巖型鈾礦,具有“低品位、厚砂體、高滲透”的特點。本文在前人室內(nèi)研究工作的基礎(chǔ)上,首先通過開展現(xiàn)場地浸條件試驗,研究該礦床現(xiàn)場酸法地浸采鈾特征及可行性;然后采用地下水?dāng)?shù)值模擬軟件VisualMODFLOW建立研究區(qū)地浸采鈾水動力模型,研究不同抽注液流量和抽注孔距離條件下的溶浸液滲流特征�，F(xiàn)場條件試驗結(jié)果表明,酸法地浸工藝適合巴彥烏拉鈾礦床鈾浸出,且氧化劑能夠強化浸出效果;條件試驗期間,CDI-1和CDI-2單元浸出液平均鈾濃度分別為19.61mg/L和46.69mg/L,試驗結(jié)束時,兩單元浸出液鈾濃度分別保持在18mg/L和30mg/L左右,浸鈾效果良好;試驗單元的浸出效果與礦石品位、礦層厚度、平米鈾量及含礦層所處地球化學(xué)環(huán)境有關(guān);較高的酸度可以保持較高的鈾濃度,溶浸液酸度為10g/L時,兩單元浸出液平均鈾濃度分別為21.72mg/L和54.57mg/L,是酸度為8g/L階段的1.05和1.18倍。模擬結(jié)果表明,在抽注平衡條件下,地浸單元的平均水力梯度隨抽液流量增加而增加,隨抽注孔距離增加而減小;地浸場有效溶浸面積隨抽注液量和抽、注液孔距離的增大而增大;溶浸液利用率隨抽注液量增大而增高,隨抽、注液孔距離的增大而降低;在抽注平衡的“四注一抽”條件下,當(dāng)抽注孔距離為30m,抽液孔流量為12m3/h時,溶浸液流速適宜,溶浸面積約6280m2,溶浸液利用率在80%以上,可獲得較好的浸出效果。本論文研究成果對巴彥烏拉鈾礦地浸工藝技術(shù)及地浸工藝參數(shù)的確定具有借鑒指導(dǎo)意義,對于抽注液流量及抽注孔距離的確定具有參考價值。
[Abstract]:Sandstone-type uranium deposits are the key point of uranium resources development in China, and Inner Mongolia is a large base for the development of sandstone-type uranium deposits in China. Bayan Ula uranium deposit is the first sandstone-type uranium deposit in Inner Mongolia, which has the characteristics of "low grade, thick sand body and high permeability". On the basis of previous laboratory research work, this paper studies the characteristics and feasibility of in-situ leaching of uranium by in-situ acid leaching of the deposit through in-situ leaching tests. Then the hydrodynamic model of in-situ leaching of uranium in the study area was established by using the groundwater numerical simulation software VisualMODFLOW to study the seepage characteristics of leaching solution under different pumping fluid flow and pumping hole distance. Field test results show that acid in-situ leaching process is suitable for uranium leaching of Bayan Ura uranium deposit, and oxidant can enhance leaching effect. During the conditional test, the average uranium concentration of CDI-1 and CDI-2 unit leaching solution was 19.61mg/L and 46.69 mg / L, respectively. At the end of the experiment, the uranium concentration of the two unit leaching solution was kept at 18mg/L and 30mg/L, respectively, and the leaching effect was good. The leaching effect of the test unit is related to the ore grade, the thickness of the ore bed, the uranium content in the square meter and the geochemical environment of the ore-bearing bed. When the acidity of solution is 10g/L, the average uranium concentration of the two unit leaching solution is 21.72mg/L and 54.57 mg / L, which is 1.05 and 1.18 times of that of 8g/L stage. The simulation results show that under the condition of pumping equilibrium, the average hydraulic gradient of in-situ leaching unit increases with the increase of pumping flow and decreases with the increase of pumping hole distance. The effective leaching area of the in-situ leaching field increases with the amount of liquid injected and the distance of the injection hole increases, and the utilization ratio of the solution increases with the increase of the volume of the liquid injection, and decreases with the increase of the distance of the injection hole. Under the condition of "four injection and one pumping", when the distance of pumping hole is 30m, the flow rate of solution is 12m3/h, the flow rate of solution is suitable, the area of leaching is about 6280m2, and the utilization ratio of solution is more than 80%. The better leaching effect can be obtained. The results of this paper can be used for reference in the determination of in-situ leaching technology and in situ leaching process parameters of Bayan Ula uranium mine, as well as for the determination of pumping fluid flow rate and pumping hole distance.
【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】：2017
【分類號】：TD868

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蘇學(xué)斌;李喜龍;劉乃忠;王金海;張磊;;環(huán)境友好型地浸采鈾工藝技術(shù)與應(yīng)用[J];中國礦業(yè);2016年09期

2 杜自耕;邢擁國;劉金輝;姚益軒;唐華章;;某鈾礦床礦石酸、堿柱浸試驗研究[J];東華理工大學(xué)學(xué)報(自然科學(xué)版);2016年01期

3 王海潮;;溶浸采礦技術(shù)的進(jìn)展與展望[J];科技風(fēng);2014年08期

4 周春風(fēng);馬強;馮志剛;;某砂巖型鈾礦中鈾形態(tài)及其可浸出性的分析研究[J];湖南科技學(xué)院學(xué)報;2013年12期

5 周義朋;沈照理;孫占學(xué);何江濤;邢擁國;;地浸采鈾抽注平衡關(guān)系對溶浸液流失與地下水流入的影響[J];有色金屬(礦山部分);2013年04期

6 紀(jì)媛媛;周金龍;楊廣焱;;GMS在我國地下水資源評價與管理中的應(yīng)用[J];地下水;2013年02期

7 蘇學(xué)斌;杜志明;;我國地浸采鈾工藝技術(shù)發(fā)展現(xiàn)狀與展望[J];中國礦業(yè);2012年09期

8 侯建朝;施泉生;譚忠富;;我國核電發(fā)展的鈾資源供應(yīng)風(fēng)險及對策[J];中國電力;2010年12期

9 杜俐;花明;張坤;;我國鈾資源探礦權(quán)評估淺議[J];老區(qū)建設(shè);2010年10期

10 薛禹群;;中國地下水?dāng)?shù)值模擬的現(xiàn)狀與展望[J];高校地質(zhì)學(xué)報;2010年01期

相關(guān)碩士學(xué)位論文 前5條

1 穆海礁;某乙烯化工廠對地下水污染的預(yù)測與評價[D];吉林大學(xué);2015年

2 張弛;結(jié)合升尺度方法的地下水污染物遷移研究[D];上海交通大學(xué);2014年

3 郝威;伊犁盆地南緣土壤金屬活動態(tài)元素富集規(guī)律及對鈾礦化的指示作用[D];核工業(yè)北京地質(zhì)研究院;2013年

4 周敏;海州礦淋濾液對地下水污染的數(shù)值模擬研究[D];遼寧工程技術(shù)大學(xué);2008年

5 苗春燕;太原市西張地下水庫截滲墻建設(shè)的數(shù)值模擬研究[D];太原理工大學(xué);2008年

，

本文編號：2312835