【摘 要】
：
Gold dissolves electrochemically in alkaline solutions containing ligands to form complex ions with gold ion. Therefore, selective leaching of noble metals is e
【机 构】
：
Center for Integrated Research in Science and Engineering,Department of Metallurgical Science & Engi
论文部分内容阅读
Gold dissolves electrochemically in alkaline solutions containing ligands to form complex ions with gold ion. Therefore, selective leaching of noble metals is expected without dissolution of base metals such as steels, aluminum alloys in scrap treatment. Gold electrodes were investigated using linear sweep voltammetry, EQCM method and potentiostatic electrolysis in alkaline solutions containing thiourea, Na2SO3 and Na2S2O3. The solution composition, electrode potential affect gold dissolution rate and current efficiency. The gold dissolved from anode electrode forms complex ions, suspension particles as compound precipitates and deposits on cathode electrode as a metal. Anodic efficiency for gold dissolution is between 10% and 22%. This is caused by the oxidation decomposition of sulfite ions and thiourea. The stability of the alkaline solution containing these elements was also estimated by capillary electrophoresis technique.
其他文献
In order to catch more process details in chemical processes, a dynamic model for prediction of process trends is proposed by modifying traditional time-series
The firing tests with clay blocks were undertaken to study the fluorine expulsion and retention characteristics of calcium-based materials during the firing of
The structural and magnetic properties of an oxide-fluoride mixed vitreous matrix 2B2O3@SrF2, were explored by using Fe impurities as probes. Information about
Adsorption equilibrium isotherms of benzene in the concentration range of 500-4000mg@m-3 on two commercial activated carbons were obtained using long-column met
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
A molecular thermodynamic model of polyelectrolyte developed previously was extended to polyelectrolyte solutions with added salts. Thermodynamic properties, su
Using a modified ABCD-matrix approach accounting for nonlinear refraction in active medium,the ranges of cavity parameters that provide a mode-locking of Yb∶KY
The WC-6%Co(mass fraction) substrate surfaces were chemically pretreated with the two-step etching method, using Murakami reagent for 3～7min, and then an φ(HNO3
An experimental observation of the competition between quantum interference and stimulated electronic Raman scattering (SERS) via equal-frequency hybrid excitat
The effects of La(NO3)3 on the growth,activities of SOD,CAT and MDA content in shoots and roots of wheat seedlings under mercury stress were evaluated by the nu