Effect of temperature-induced phase transitions on bioleaching of chalcopyrite  

温度诱导相变对黄铜矿生物浸出的影响（英文）

作　　者：Ke-xin CHANG Yan-sheng ZHANG Jia-ming ZHANG Teng-fei LI Jun WANG Wen-qing QIN 常可欣;张雁生;张家明;李腾飞;王军;覃文庆(中南大学矿物加工与生物工程学院)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第10期2183-2191,共9页中国有色金属学报（英文版）

基　　金：Project(2018zzts768) supported by the Fundamental Research Funds for the Central South University,China;Project(51204207) supported by the National Natural Science Foundation of China

摘　　要：The phase transformation of chalcopyrite and the effect of its phase status on bacterial leaching were studied. Under the protection of high-purity argon, different temperatures(203, 382 and 552℃) were applied to natural chalcopyrite to complete the phase change. In addition, the chalcopyrite was bioleached before and after the phase change. The results show that the chalcopyrite heated at 203 and 382℃ remained in the α phase, whereas the chalcopyrite changed from α to β phase at 552℃. The leaching rates of chalcopyrite after the phase transitions at 203, 382 and 552℃ were 32.9%, 40.5% and 60.95%, respectively. Further, the crystal lattice parameters of chalcopyrite increased and lattice energy decreased, which were the fundamental reasons for the significant increase in leaching rate. Electrochemical experiments demonstrated that with increasing annealing temperature, the polarization resistance decreased and corrosion current density increased. The higher the oxidation rate was, the higher the leaching rate was.研究黄铜矿的相变及其相态对细菌浸出的影响。在高纯氩气的保护下,将天然黄铜矿加热到不同的温度(203、382和552℃)以完成相变。并将黄铜矿在相变前后进行生物浸出实验。结果表明,在203℃和382℃加热的黄铜矿仍处于α相区,而在552℃下黄铜矿由α相转变为β相,3种不同温度相变后的黄铜矿的浸出率分别为32.9%、40.5%和60.95%。黄铜矿晶格增大、晶格能降低,这是浸出率显著提高的根本原因。电化学实验表明,随着退火温度的升高,极化电阻降低,腐蚀电流密度增加;黄铜矿的氧化率越高,浸出率就越高。

关 键 词：lattice parameter CHALCOPYRITE phase transition BIOLEACHING ELECTROCHEMISTRY 

分 类 号：TF811[冶金工程—有色金属冶金]