Acidianus manzaensis对不同晶体结构黄铜矿浸出的作用（英文）

Bioleaching of chalcopyrite with different crystal phases by Acidianus manzaensis

基于同步辐射X射线衍射(SR-XRD)和硫K边X射线吸收近边结构(XANES)光谱学等技术,比较研究A. manzaensis对不同晶体结构黄铜矿(α相、β相和γ相)的浸出。通过在583、773和848K热处理原始黄铜矿,获得α相、β相和γ相黄铜矿。生物浸出的结果表明,经过10 d的生物浸出,α相、β相、γ相和原始黄铜矿浸出液中[Cu^(2+)]分别为1.27、1.86、1.43和1.13 g/L,表明β相的黄铜矿比其他类型的黄铜矿更容易被A. manzaensis浸出。SR-XRD和XANES的结果表明,这4种类型黄铜矿生物浸出的残渣主要是由黄钾铁矾和黄铜矿组成,单质硫在生物浸出的初期产生。而对于β相和γ相黄铜矿生物浸出过程而言,斑铜矿在浸出的初始阶段产生,并且在第6天转化为辉铜矿。

Bioleaching of chalcopyrite with different crystal structures (α-phase,β-phase and γ-phase) by Acidianus manzaensis was comparatively studied by synchrotron radiation based X-ray diffraction (SR-XRD) and S K-edge X-ray absorption near edge structure (XANES) spectroscopy. The α-phase,β-phase and γ-phase chalcopyrite was prepared by heating original chalcopyrite at 583, 773 and 848 K, respectively. Bioleaching results showed that [Cu^2+] in the leaching solution of α-phase,β-phase,γ-phase and original chalcopyrite after 10 days of bioleaching was 1.27, 1.86, 1.43 and 1.13 g/L, respectively, suggesting that β-phase had a better leaching kinetics than others. SR-XRD and XANES results indicated that jarosite and chalcopyrite were the main components in the leaching residues in all cases, and elemental sulfur formed in the early stage of bioleaching. While for β-phase and γ-phase chalcopyrite during bioleaching, bornite was produced in the initial stage of leaching, and turned into chalcocite on day 6.