細粒層對浸礦表面形貌及鈍化的影響

尹升華; 王雷鳴; 潘晨陽; 陳勛

doi:10.13374/j.issn2095-9389.2018.08.003

細粒層對浸礦表面形貌及鈍化的影響

doi: 10.13374/j.issn2095-9389.2018.08.003

尹升華^1,2,
王雷鳴^1,2, ,,
潘晨陽¹,
陳勛^1,2

1) 北京科技大學金屬礦山高效開采與安全教育部重點實驗室, 北京 100083;
2) 北京科技大學土木與資源工程學院, 北京 100083

基金項目:

國家優秀青年科學基金資助項目（51722401）；國家自然科學基金重點資助項目（51734001）

詳細信息

中圖分類號: TD862
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出版歷程
- 收稿日期: 2017-08-30

Effect of fine interlayers on surface morphology and passivation during leaching

1) Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal, University of Science and Technology Beijing, Beijing 100083, China
2) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 由于礦石粒徑配比、表面粗糙度、密度等性質差異，筑堆過程中堆內極易出現礦石顆粒偏析現象.細粒層是導致礦石表面受侵蝕程度不均的關鍵因素，其嚴重制約了銅礦資源的高效浸取.為探究細粒層對礦石浸出效果、表面形貌及鈍化現象的影響，選取粗顆粒礦石（4 mm < d < 6 mm）與細顆粒礦石（2 mm < d < 4 mm），開展不同細粒層位置下次生硫化銅礦微生物浸出實驗.結合CT掃描與冷場電鏡掃描技術等分析手段，從宏、細、微觀多層面，探究不同細粒層位置下礦石宏觀浸出規律，細觀礦石團聚結塊，微觀表面形貌特征與鈍化.結果表明：細粒層導致銅浸出率普遍降低，均低于無細粒層、均勻粗顆粒介質的實驗組；不同礦堆位置處細粒層對浸出效果影響不同，細粒層位于頂部的實驗組銅浸出效果最優，浸礦60 d銅浸出率達71.3%；同一細粒層不同位置處礦石表面孔裂結構演化程度不一；浸礦60 d后，銅浸出率趨于峰值，礦石團聚結塊與鈍化現象顯著，礦石表面形成以黃鉀鐵礬、多硫化物、胞外多聚物、硫膜為主的鈍化物質層.
- 次生硫化銅礦 /
- 生物浸出 /
- 細粒層 /
- 表面形貌 /
- 鈍化現象
Abstract: Ore particle segregation commonly occurs during dump leaching because of the differences of particle size, surface roughness, and relative density. The presence of a fine interlayer is key factor of the uneven erosion of the ore surface during leaching, which seriously limits the bioleaching efficiency of copper extraction. To explore the interaction effects of fine interlayers on leaching behavior, the surface morphology and passivation occurrence during the leaching process was studied, where coarse ore particles (4 mm < d < 6 mm) and fine ore particles (2 mm < d < 4 mm) were selected, and a bioleaching experiment of secondary copper sulfide with fine interlayers located at different positions was carried out. Analysis were carried out using computed tomography (CT) scanning technology and field-emission scanning electron microscopy-energy dispersive spectrometry (FE SEM-EDS) technology in the macro, meso, and micro scales. As a result, the macro leaching dynamics, meso-scale ore particle agglomeration, and micro surface morphology characteristics as well as passivation were studied. The results show that fine interlayer leads to a lower copper extraction rate, which is lower than when the fine interlayers are mixed with homogeneous coarse granular medium. The effects of fine interlayers on ore extraction depend on their location. In the experiment, the fine interlayers located at the top results in the highest copper extraction rate (71.3%) after leaching for 60 days; the degrees of evolution of the ore surface pore structure are different at different heights inside the same fine interlayers. The copper extraction rate reaches its peak after leaching for 60 days. The ore particle agglomerations and passivation phenomenon are significant. Passivation layers, such as of jarosite, polysulfide, extracellular polymeric substances, sulfur film, are formed on the ore surface.
- secondary copper sulfide /
- bioleaching /
- fine interlayers /
- surface morphology /
- passivation phenomenon

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