articleAdvanced Engineering MaterialsMar 4, 2026HYBRID OA

Characterization of a Recyclate‐Based MgO‐Steel Composite As‐Sintered Inert Anode Candidate After Exposure to Cryolite Electrolysis

SYSerhii YaroshevskyiAAAlexander AdamczykNBNora BrachholdGSGert SchmidtJHJana Hubálková

TU Bergakademie Freiberg

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Abstract

The replacement of consumable carbon anodes with oxygen‐evolving inert, carbon‐free anodes is a key technological challenge for decarbonizing primary aluminum production. While metallic, ceramic, and cermet anodes have been extensively studied, the use of recycled raw materials remains largely unexplored. In this work, composite cermet anodes consisting of 60 vol% AISI 316L stainless steel and 40 vol% recycled MgO from spent refractories were developed and tested under galvanostatic Hall–Héroult electrolysis conditions in cryolite at 1000°C. The as‐sintered composites exhibited stable cell voltage (3.2–3.3 V) over 2 h of operation. Postexperiment SEM/EDS/EBSD analyses revealed a multilayered structure with…

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Topics & keywords

Topics
Keywords
  • Cryolite
  • Cermet
  • Anode
  • Inert
  • Electrolysis
  • Composite number
  • Spinel
  • Porosity
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