Equilibrium of Copper Matte and Silica-Saturated Iron Silicate Slags at 1300 °C and $$ P_{{{\text{SO}}_{ 2} }} $$ of 0.5 atm

Abstract

Experimental study on the phase equilibria between copper matte with silica-saturated iron silicate slags was conducted at 1300 °C and $$ P_{{{\text{SO}}_{ 2} }} $$ P SO 2 = 0.5 atm. The high-temperature isothermal equilibration in silica crucibles under controlled flowing CO-CO2-SO2-Ar was followed by quenching in an ice–water mixture and direct phase composition analyses by an electron probe X-ray microanalyzer. The equilibrium compositions for matte and slag, as well as the distribution coefficients, were displayed as a function of matte grade. The data set obtained at $$ P_{{{\text{SO}}_{ 2} }} $$ P SO 2 = 0.5 atm and the previous study at $$ P_{{{\text{SO}}_{ 2} }} $$ P SO 2 = 0.1 atm by the authors enabled an investigation on the impacts of $$ P_{{{\text{SO}}_{ 2} }} $$ P SO 2 as well as Al2O3 and CaO additions on phase equilibria in the multiphase copper matte smelting system. Thermodynamic calculations using MTDATA software were performed to compare the experimental results with modeling. The present results enrich the fundamental thermodynamic information for the matte/slag/tridymite/gas equilibria in the primary copper smelting process at high $$ P_{{{\text{SO}}_{ 2} }} $$ P SO 2 .

Precious Metal Distributions Between Copper Matte and Slag at High $$ P_{{{\text{SO}}_{ 2} }} $$ in WEEE Reprocessing

“…The glassy slag phase was homogeneous; however, copper-rich veins and small segregations with higher precious metal concentrations were distributed randomly in the matte phase, most likely due to an insufficient quenching rate, as seen earlier. [25,48,49] The concentrations of precious metals in matte and slag with standard deviations (± 1r) are listed in Table III. The results for the major elements can be seen in our previous study.…”

“…Experiments were conducted in a similar way to our previous studies. [25,27,48,49] A high-temperature equilibration under controlled CO-CO 2 -SO 2 -Ar gas atmospheres followed by quenching in ice-water mixture and direct phase analyses by EPMA and LA-HR ICP-MS (HR-High Resolution) techniques was used to study the distributions of precious metals between copper matte and slag. A schematic image of the laboratory-scale furnace used is shown in Figure 1.…”

“…All further details of the furnace and the gas flows used for achieving the desired atmosphere have been presented in our previous publication, which focused on the major element equilibrium in these same experiments. [49] The slag mixtures were produced using analytical high-purity powders of Fe 2 O 3 (99.998 wt pct, Alfa Aesar), SiO 2 (99.995 wt pct, Alfa Aesar), Al 2 O 3 (99.99 wt pct, Sigma-Aldrich), and CaO (99.9 wt pct, Sigma-Aldrich). The copper matte mixtures were prepared by Cu 2 S (99.5 wt pct) and FeS (99.9 wt pct), all from Alfa Aesar.…”

“…The samples were equilibrated under different CO-CO 2 -SO 2 -Ar gas atmospheres at experimental temperature for 4 hours. [25,48,49] The equilibrated samples were quenched into an ice-water mixture.…”

Selective coordination of cobalt ions by zinc fingers in Escherichia coli

“…[1][2][3][4] There are limited resources of transition metal ions and industrial usage of these elements requires recyclization. [5][6][7][8] Both elimination and harvesting processes of these metal ions need to avoid secondary and environmental contamination. Trials of bioremediation, to eliminate or harvest metal ions, are considered promising strategies to overcome these poisoning issues; metalloproteins can be considered as promising tools in these strategies.…”