SaltX siderite conversion at VA Erzberg: decarbonised calcination insights for mine plants
Reviewed by Joe Ashwell

First reported on International Mining – News
30 Second Briefing
SaltX has reported successful pilot tests of its Electric Arc Calciner (EAC) on carbonate iron ore (siderite) from VA Erzberg in Austria, showing effective high‑temperature conversion of carbonate‑rich feed using electrical rather than fossil‑fuel heat. The EAC process targets decarbonisation of traditional calcination by electrifying the thermal step, which is central to siderite ore upgrading and other carbonate processing. For mine operators and plant designers, this points to potential retrofits or new-build plants where high-temperature kilns could be replaced or supplemented with grid- or renewables-powered electric calciners.
Technical Brief
- EAC trials formed part of SaltX’s broader material validation programme across multiple carbonate-bearing feedstocks.
- Pilot-scale EAC unit was run under controlled high-temperature conditions comparable to industrial calcination duty.
- Process evaluation focused on conversion behaviour of siderite, not just bulk energy substitution or CO₂ accounting.
- Results confirm electrical arc heating can be tuned to handle the mineralogy and decomposition profile of siderite.
Our Take
Iron ore pieces in our database are mostly dominated by Australia, Brazil and West Africa, so Austria’s VA Erzberg stands out as one of the few European iron ore operations experimenting with process-route changes rather than just mine expansion.
Among the 653 Projects/Sustainability-tagged items, iron ore stories more often concern Scope 3 emissions and green steel offtake; lab-scale conversion work like SaltX’s suggests upstream miners are starting to tackle ore-specific decarbonisation levers at the deposit level.
For a European iron ore producer such as VA Erzberg, successful siderite conversion has strategic implications: it can extend the economic life of complex deposits and help meet EU industrial decarbonisation pressures without relying solely on imported high-grade feedstock.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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