Carbon anodesCarbon anodes for aluminiumAluminium production are produced from calcined petroleum cokePetroleum coke (CPCCPC), recycled anodeAnode butts and coal tar pitchCoal tar pitch (CTPCTP). The CO2CO2 produced during anodeAnode consumption contributes to a substantial amount of the CO2CO2 footprint of this industrial process. Charcoal from wood has been suggested to partly replace coke in anodesAnode but high porosityPorosity, low electrical resistivity and high ash content contributes negatively to final anodeAnode properties. In this work, charcoal from Siberian larchSiberian larch and spruceSpruce was produced by heat treatmentHeat treatment to 800, 1200 and 1400 ℃ and acid-washed with H2SO4. Acid-washingAcid-washing resulted in reduced metal impurity and the porosityPorosity decreased with increasing heat treatmentHeat treatment. Pilot anodes were made from CTPCTP, CPCCPC with some additions of spruceSpruce and larch charcoal. Another set of pilot anodes were produced using a green binder. Compared to reference anodes, the CO2CO2 reactivity of anodes containing larch was less affected compared to anodesAnode containing spruceSpruce. The green binder was found to be highly detrimental for the anodes’ CO2CO2 reactivity properties. Electrochemical consumption increased for anodes containing both green binder, larch and spruceSpruce compared to the reference anodeAnode.
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- Charcoal and Use of Green Binder for Use in Carbon Anodes in the Aluminium Industry
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