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In this study, the fungus Hormoconis resinae was screened from soil near a refinery and was found to produce stable gold nanoparticles extracellularly. The kinetics of the reaction was studied using UV-Vis spectroscopy and was further characterized by x-ray diffraction, energy dispersive x-ray (EDX) analysis, and high-resolution transmission electron microscopy. These analyses revealed that the gold...
Bath-metal interface oscillation reduces the stability and efficiency of Hall-Héroult cells. However, the oscillation characteristics have not been understood in detail. A well-designed probe and an online monitor system were designed for monitoring the metal fluctuation. Experiments and analyses show the metal fluctuation can be captured, and a corresponding relationship between anode-cathode distance...
The “old fashioned” and imprecise approach of using a dip stick is still employed to measure the crucial level information in electrolysis baths in the aluminum industry. The dip stick method is based on manually immersing a metal rod into the cell and observing the marks left by the molten bath components to estimate the metal/electrolyte interface and the bath level. However, methods to improve...
Abstact White alloy, mainly containing Cu, Co, and Fe, has been successfully decomposed in HCl solution by adding H2O2. This process is discussed in this paper. Through exploratory experiments, hydrochloric acid and H2O2 solution were confirmed as the leaching system of white alloy and through a series of condition experiments the effect of HCl concentration, H2O2 addition amount, reaction temperature,...
The supersaturation of sodium aluminate solution (liquor) is a prerequisite for agglomeration and the key factors that determine supersaturation of liquor are caustic sodium concentration (Nk) and molecular ratio of Na2O to Al2O3 (αk). In this paper, the effects of Nk and αk on the agglomeration process of seeded precipitation were studied. The results show that the Nk plays an important role in the...
This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfides. Silver is present extensively as antimonial sulfides such as andorite. Alkaline sulfide pretreatment was shown to...
The melt flow field and magneto-hydrodynamics (MHD) instabilities in aluminum reduction cells strongly affect the current efficiency and cell operation and a great deal of effort has gone into modeling melt flow and MHD instabilities. In this review, the progress of melt flow is presented: the successes and defects of modeling melt flow via k-ɛ model, Navier-Stokes equations due to different driving...
Shijie Wang is with Kennecott Utah Copper Corp. in Magna, Utah and is the advisor to JOM from the Hydrometallurgy and Electrometallurgy Committee of the Extraction & Processing Division of TMS.
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