Smarter filtration for alumina: process design takeaways for refinery engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Targeted filtration upgrades from Sefar are boosting throughput and lowering operating costs in alumina refineries by tailoring filter media to specific Bayer process stages. Custom-designed cloths and synthetic fabrics are being matched to caustic slurry chemistries, particle-size distributions and temperature profiles in security filtration, washer circuits and polishing filters to reduce blinding and extend change-out intervals. For process engineers, the approach offers a way to stabilise vacuum and pressure filter performance, cut reagent and energy use, and improve underflow/overflow clarity without major capital modifications.
Technical Brief
- Sefar is supplying woven and needlefelt filter media specifically for Bayer-process alumina refineries.
- Media selections are tuned to caustic attack resistance, abrasion from bauxite residue and elevated liquor temperatures.
- Custom cloth designs incorporate controlled pore-size gradients to maintain cake permeability while protecting filtrate clarity.
- Edge reinforcement, stitching patterns and clip-on designs are adapted to existing vacuum drum and disc filter hardware.
- Sefar engineers are auditing individual circuits on-site, then prototyping cloth variants before full refinery roll-out.
- Trials focus on reducing cloth blinding rates under high solids loading and variable bauxite feed mineralogy.
- Fabric constructions are also adjusted to minimise wicking and caustic carry-over at discharge points.
- Similar circuit-specific cloth optimisation is being applied in other hydrometallurgical plants using caustic or hot slurries.
Our Take
Alumina appears in only 12 keyword-matched pieces across 1220 Mining stories in our database, suggesting filtration-focused process upgrades like Sefar’s are still relatively niche in published coverage compared with iron ore or gold processing tweaks.
For Australian METS suppliers, smarter alumina filtration slots into the same export opportunity space highlighted in the Austmine/SelectUSA piece, where process-intensification products can be pitched to US refineries under decarbonisation and water-use narratives.
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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