Influence of Sulfur and Metal Microconstituents on the Reactivity of Carbon Anodes

Abstract

The influence of sulfur and metal microconstituents on air and carboxy reactivity of carbon anodes was investigated. Composite samples, simulating anodes with a range of sulfur contents, and heat-treatment temperatures were prepared for this study. Composite samples with different sulfur contents had similar physical structures but different reactivities when gasified in air and carbon dioxide. Correlations of structure with reactivity and heat-treatment temperatures for high- and low-sulfur composites were identified. The catalytic activity of metal microconstituents was found to be sensitive to the heat-treatment temperature. The results indicated that the sulfur content, interaction between sulfur and metal catalysts, and heat-treatment temperature of anode raw materials were key factors in influencing the reactivity of carbon anodes.

The Effect of Varying Mixing Temperatures and Baking Level on the Quality of Pilot Scale Anodes—A Factorial Design Analysis

“…Another explanation can be that with higher baking temperature, some metal complexes may be released from the coke structure upon heating. Vanadium is a known metal air burn catalyst, as it destabilizes the carbon ring structure of the surrounding carbons [23]. However, no proof is given in the present work that vanadium or other metal complexes are actually released during the baking process.…”

Effect of high-temperature pyrolysis on the structure and properties of coal and petroleum coke

“…Air gasification reactivity and CO 2 gasification reactivity are important indicators of coke chemical activity, which significantly affect the overconsumption of carbon materials in aluminum electrolysis [14,15]. In accordance with the principle of weight loss method, the air gasification reactivity and CO 2 gasification reactivity of cokes were characterized in terms of residual rate after reaction with air and CO 2 following the test standard YS/T 587.…”

Characterization of carbon anode constituents under CO 2 gasification: A try to understand the dusting phenomenon

“…As the reaction progresses and carbon is consumed, the concentration of catalytic elements on the surface increases, leading to a rise of the reaction rate. Known for its poisoning effect [1,12,17,54,55], the presence of sulfur could also affect the catalytic activity of these elements since, as the reaction progresses, its concentration on the surface appears to be more important. In this way the catalytic elements on the samples could be considerably poisoned by the high level of sulfur, and thus result in a reduction of the reaction rate.…”