Evolution of Anode Grade Coke Quality

Edwards, Les; Backhouse, Nigel; Darmstadt, Hans; Dion, Marie-Josée

doi:10.1007/978-3-319-48179-1_208

Cited by 42 publications

(17 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The authors suggested that this was because the latter anodes produced bubbles with a higher dynamic gaseous volume fraction, possibly due to smaller bubbles that travelled more slowly, and/or differences in anode-electrolyte wetting. Aside from microstructure and wetting, other specific effects relating to changes of coke type remain unknownunderstanding this relationship is particularly important due to variation in the quality of cokes available for anode production [36][37][38].…”

mentioning

confidence: 99%

Bubble Evolution and Anode Surface Properties in Aluminium Electrolysis

Thorne

Sommerseth

Ratvik

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

One significant contribution to the anodic potential during aluminium electrolysis is the formation of CO 2 bubbles that screen the anode surface. This effect creates an additional ohmic resistance as well as an increased reaction overpotential, hyperpolarisation, as the effective surface area decreases. This work aims to improve the understanding of how anode properties -including isotropy at the optical domain level, wettability (towards electrolyte), surface roughness and porosity -affect bubble 2 evolution. Pilot anodes, made with single source coke types varying in isotropy, were used to study bubble evolution by electrochemical methods. In order to retain bubbles during experiments, anodes were designed to have only horizontal surface area.Bubble formation and release were monitored at different current densities, and were tracked by measuring the oscillations in anode potential and series resistance. Anodes made from different cokes were found to have different bubble evolution properties, possibly due to variation in the density of nucleation sites at the surface of each anode and varying anode-electrolyte wettability.

show abstract

mentioning

confidence: 99%

Bubble Evolution and Anode Surface Properties in Aluminium Electrolysis

Thorne

Sommerseth

Ratvik

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Over the last 10 years, gaining access to a reliable supply of low S, low metals GPC has become more challenging, and the industry no longer enjoys a ready supply relative to the demand from the calcining and aluminum industries. The reasons for this have been well documented 18,19 and are driven by changes in crude oil quality and refining economics.…”

Section: Changes In Petroleum Coke Quality: Current and Future Challementioning

confidence: 99%

“…A good summary of the range of cokes being used can be found in a 2012 paper. 19 One coke with a highly isotropic texture (non-shot with irregularly shaped particles) is now being used routinely as a blend component by several calciners at levels of up to 10-15%. Previous concerns about thermal shock cracking with the use of isotropic cokes have not materialized at these relatively low levels, but other technology changes, such as the widespread use of anode slots, have significantly reduced, and in most cases eliminated, cracking.…”

Section: Changes In Petroleum Coke Quality: Current and Future Challementioning

confidence: 99%

The History and Future Challenges of Calcined Petroleum Coke Production and Use in Aluminum Smelting

Edwards

2014

JOM

Self Cite

View full text Add to dashboard Cite

“…In addition to the less dense coke materials produced by the refining industry, the cokes also have an increasing amount of sulfur and other metal impurities compared to previously used cokes [1,2]. The changes in the quality of the petroleum coke will affect the performance of the anode in the pot room.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Coke in Relation to Sulfur Level and Microstructure

et al. 2019

View full text Add to dashboard Cite

The quality of coke materials available for anodes for the aluminium industry is changing and industrial cokes with higher impurity levels are now introduced. The cokes in the anodes must meet specifications with respect to impurity levels to ensure proper operation in the electrolysis cells, and a desired quality of the aluminium metal. The presence of sulfur has been observed to reduce the CO2 reactivity and a certain level of sulfur is therefore targeted in the anodes. In this work, the significance of varying sulfur and metal impurity content in industrial cokes were evaluated with respect to CO2 reactivity, accessible surface area, pore size distribution, surface oxide groups and crystallite reactive edge planes. While relatively similar cokes are observed to give a lower reactivity with increasing sulfur content, cokes that have distinct differences in surface properties can have dissimilar reactivity despite identical sulfur content. Correlations between pore size distribution and presence of S-S bound sulfur, possibly condensed Sx, was also observed.

show abstract

Evolution of Anode Grade Coke Quality

Cited by 42 publications

References 7 publications

Bubble Evolution and Anode Surface Properties in Aluminium Electrolysis

Bubble Evolution and Anode Surface Properties in Aluminium Electrolysis

The History and Future Challenges of Calcined Petroleum Coke Production and Use in Aluminum Smelting

Reactivity of Coke in Relation to Sulfur Level and Microstructure

Contact Info

Product

Resources

About