论文摘要
While roasting has been widely applied to reduce the negative effect of carbonaceous matters on gold extraction from fine-grained carbonaceous gold ores, the phase and structure changes of minerals during roasting and their influences on the leaching rate of gold have not been fully understood. This limits the extraction of carbonaceous gold deposits. The current work examines the oxidation process of a fine-grained carbonaceous gold ore during roasting using a range of techniques including X-ray diffraction（XRD）, scanning electron microscopy（SEM）,Energy Dispersive Spectrometer（EDS） analysis and pore structure analysis together with gold leaching tests.The results show that during the process of oxidative roasting, the carbonaceous matters（organic carbon and graphitic carbon） and pyrite were completely decomposed at 600 ℃ with the carbonaceous components burned and pyrite oxidized into hematite. At 650 ℃, while dolomite was decomposed into calcia, magnesia, calcium sulfate etc., the calcine structure became loose and porous, leading to a high gold leaching rate from the roasted product. Above 750 ℃, the porous calcite structure started to collapse along with the agglomeration, leading to the secondary encapsulation of gold particles, which contributed to the sharp drop in the gold leaching rate of the roasted product. This study suggests optimum phase and structure changes of minerals during roasting to achieve maximum gold extraction from fine-grained carbonaceous gold deposits.
论文目录
文章来源
类型: 期刊论文
作者: Jianping Jin,Yuexin Han,Hui Li,Yangyang Huai,Yongjun Peng,Xiaotian Gu,Wei Yang
来源: Chinese Journal of Chemical Engineering 2019年05期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 冶金工业
单位: School of Resources & Civil Engineering, Northeastern University,Xi’an Northwest Geological Institute Company of Nonferrous Metals Co., Ltd.,College of Material and Resource, Xi’an University of Architecture and Technology,School of Chemical Engineering, The University of Queensland,St.Lucia
基金: Supported by the National Natural Science Foundation of China(51704059,51474169)
分类号: TF831
页码: 1184-1190
总页数: 7
文件大小: 2434K
下载量: 12
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