(北京科技大學(xué) 金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083)
摘 要: 為了揭示氧化銅礦堆浸過程中散體介質(zhì)及滲流狀態(tài)的演化規(guī)律，通過闡述堆浸體系孔隙和裂隙雙重介質(zhì)概念，結(jié)合氧化銅酸浸實(shí)驗(yàn)、CT 技術(shù)和掃描電鏡技術(shù)，在微觀和細(xì)觀層面研究孔隙和裂隙分形演化特征，得到孔隙率和滲透率隨浸出時間的演化規(guī)律，建立氧化銅堆浸隨時間演化的分形雙重介質(zhì)滲流模型。結(jié)果表明：氧化銅礦石經(jīng)酸浸后，微觀形貌變化較大，裂隙分形盒維數(shù)明顯增加；而顆粒間孔隙的分形盒維數(shù)略微減小。考慮了堆浸雙重介質(zhì)、介質(zhì)間竄流、動態(tài)孔隙率和滲透率以及分形演化規(guī)律的滲流模型更符合實(shí)際，可在理論上揭示溶浸液滲流過程的一般規(guī)律。
關(guān)鍵字: 氧化銅；堆浸；分形；雙重介質(zhì)；滲流
（Key Laboratory of High-Efficient Mining and Safety of Metal Mines,Ministry of Education,
University of Science and Technology Beijing,Beijing 100083,China）
Abstract:In order to reveal the evolution rules of granular ore medium and seepage state in the process of copper oxide ore heap leaching,the concept of pore-fracture double-porosity media in dump leaching was illustrated,and the pore-fracture fractal evolution characteristics were researched in microscopic and mesoscopic level by the copper oxide acid leaching experiments,CT and SEM techniques. The evolution rules of the porosity and permeability with leaching time were obtained,and the fractal seepage model of copper oxide dump leaching for double-porosity system was established. The results show that the microstructure of copper oxide changes greatly after acid leaching,the fracture fractal dimension increases obviously; but the fractal dimension of pore between particles decreases a little. The seepage model is more realistic to consider the dual media,interporosity flow state between the media,dynamic porosity and permeability,and the fractal evolution rules,which can reveal the general rule of seepage process in dump leaching.
Key words: copper oxide; dump leaching; fractal; media with double-porosity; seepage
