A Novel Electrochemical Process for Desulfurization in the CaO-SiO2-Al2O3 System

Abstract

The effect of electric potential on the sulfide capacity of the CaO-SiO2-Al2O3 system was evaluated by applying voltages in the range of −1.5 to 1.5 V at 1823 K in a C/CO gas equilibrium. When the cathodic potential (−1.5 to 0 V) was applied, it was confirmed that the sulfur partition ratio increased based on the electrochemical reaction of sulfur (S + 2e− = S2−). However, the reversibility of the electrochemical resulfurization reaction (S2− = S + 2e−) in slag was not established in the reverse (anodic) potential region (0–1.5 V), yet the sulfur partition ratio increased. In particular, sulfur evaporation was observed in the anodic potential region. Therefore, in the present study, potential anodic electro-desulfurization mechanisms based on sulfur evaporation are proposed. To verify these mechanisms, sulfur evaporation is discussed in detail as a function of the thermodynamic stability of sulfur in the slag.

Effects of Na2O, K2O and B2O3 on Deformability of SiO2-MnO-Al2O3 Inclusion in High-Carbon Steel

“…Cord steel wire is widely used in industry because of its excellent performance, a d is used in the bridge industry to make the main load-bearing component cables, in the tire industry to make tire skeletons [1,2] and in the photovoltaic industry for cutting silicon wafers [3,4]. The diameter of steel cord is 80~200 µm, which is for the main skeleton of tires, and the diameter of cutting steel wire is 50~80 µm, which is mainly used for cutting precious materials such as solar silicon wafers, gems and aviation semiconductors [5].…”

Molten Oxide Electrolysis Using Copper-Containing Carbon-Saturated Molten Iron Anode

“…It has been demonstrated that cathodic polarization of the melt interface between molten Cu and molten SiO 2 -CaO-Al 2 O 3 can promote the dissolution of S present in Cu into slag. [32][33][34] In contrast, few studies have concentrated on the phenomenon of a positively induced anode reaction at the molten iron-slag interface. The basic concept of this study is to promote the dissolution of Cu in molten Fe into molten slag via electrolysis.…”

Environment-Friendly Electrochemical Processes

“…Reports regarding the recent advances in electrochemical processes for the destruction of pollutants were also pointed out for potential anodic electro-desulfurization [ 5 ], sequenced electrooxidation–plasma treatment [ 6 ], electrochemical chloride removal [ 7 ], and electrodisinfection [ 8 ]. By applying anodic potentials, the sulfur partition ratio was determined, allowing the proposal of an anodic electro-desulfurization mechanism, which will allow further advances on pyrometallurgy processes [ 5 ].…”

“…Reports regarding the recent advances in electrochemical processes for the destruction of pollutants were also pointed out for potential anodic electro-desulfurization [ 5 ], sequenced electrooxidation–plasma treatment [ 6 ], electrochemical chloride removal [ 7 ], and electrodisinfection [ 8 ]. By applying anodic potentials, the sulfur partition ratio was determined, allowing the proposal of an anodic electro-desulfurization mechanism, which will allow further advances on pyrometallurgy processes [ 5 ]. Meanwhile, important benefits could be achieved by using electrochemical oxidation as an alternative to removing azo dyes [ 6 ] and chloride [ 7 ] from different water matrices in order to promote advantages in the food processing industry and concrete construction sectors, respectively.…”