Copper Recovery and Reduction of Environmental Loading from Mine Tailings by High-Pressure Leaching and SX-EW Process
Copper Recovery and Reduction of Environmental Loading from Mine Tailings by High-Pressure Leaching and SX-EW Process
复制标题
DOI：
10.3390/met11091335
复制
发表时间：
2021-08
期刊：
影响因子：
2.9
通讯作者：
Labone L. Godirilwe;Kazutoshi Haga;B. Altansukh;Y. Takasaki;D. Ishiyama;V. Trifunović;L. Avramović;R. Jonovic;Z. Stevanović;A. Shibayama
中科院分区：
文献类型：
--
作者：
Labone L. Godirilwe;Kazutoshi Haga;B. Altansukh;Y. Takasaki;D. Ishiyama;V. Trifunović;L. Avramović;R. Jonovic;Z. Stevanović;A. Shibayama
博尔铜矿浮选尾矿中含有黄铁矿（FeS2）和黄铜矿（CuFeS2），这些硫化物矿物会促进酸性矿山排水（AMD），对环境和人体健康构成严重威胁。这项研究的重点是处理尾矿，将AMD支持矿物转化为更稳定的形式，同时使尾矿增值。采用高压氧化浸出（HPOL）、溶剂萃取（SX）和电积（EW）相结合的湿法冶金工艺从含铜0.3%左右的尾矿中回收铜。当用水作为浸出介质时，HPOL工艺产生了94.4%的高铜浸出率。黄铁矿氧化生成硫酸促进了铜浸出动力学。还证实，在反萃溶液中获得的低铁浓度（1.4g/L）和高铜浓度（44.8g/L）导致铜电解提取期间铜电沉积电流效率的提高。此外，主要存在于尾矿中的黄铁矿在HPOL后转化为赤铁矿。固体残留物的稳定性评价证实几乎没有金属离子洗脱，证实通过再处理降低了尾矿的环境负荷。
The flotation tailings obtained from Bor Copper Mine contain pyrite (FeS2) and chalcopyrite (CuFeS2), these sulfide minerals are known to promote acid mine drainage (AMD) which poses a serious threat to the environment and human health. This study focuses on the treatment of mine tailings to convert the AMD supporting minerals to more stable forms, while simultaneously valorizing the mine tailings. A combination of hydrometallurgical processes of high-pressure oxidative leaching (HPOL), solvent extraction (SX), and electrowinning (EW) were utilized to recover copper from mine tailings which contain about 0.3% Cu content. The HPOL process yielded a high copper leaching rate of 94.4% when water was used as a leaching medium. The copper leaching kinetics were promoted by the generation of sulfuric acid due to pyrite oxidation. It was also confirmed that a low iron concentration (1.4 g/L) and a high copper concentration (44.8 g/L) obtained in the stripped solution resulted in an improved copper electrodeposition current efficiency during copper electrowinning. Moreover, pyrite, which is primarily in the mine tailings, was converted into hematite after HPOL. A stability evaluation of the solid residue confirmed almost no elution of metal ions, confirming the reduced environmental loading of mine tailings through re-processing.