Alumina
Menardi is a recognized world leader in the supply of fabric filter media to the alumina refining industry. Menardi has strategic partnerships and alliances with all of the major alumina producers in both North and South America. Many of the current standard products produced in this industry were developed by Menardi and we continue to be the most innovative in the development of new products for this industry.
Areas of Application
- Red mud clarification (Kelly filters and Baker filters)
- Oxalate filters
- Calcination (Pan filters)
- Seed wash (A Stage and B Stage rotary vacuum filter belts)
- Fine seed wash (vertical disc filters and drum filters)
Common Problems
- Excess scale buildup
- Cloth blinding
- Poor cake release
- Decreased throughput
- Bag stretching
Menardi Products Used in This Industry
- Polypropylene media with Menardi exclusive additives.
- Monofilament / multifilament polypropylene for improved cake release and reduced caustic liquor dilution.
- Laser cut panels for quality assurance and product reproducibility.
- EPDM caulking cord.
- Pneumatic air hammer for drum filters and CGR cloths.
- Sonic welded seams for belt construction to reduce seam failure.
Example Application
The heart of any alumina refinery is recognized as the "press floor". Problems that develop here stem from the filtration of a super saturated caustic liquor that will precipitate alumina onto the filter bag causing premature blinding or scale buildup. This is particularly evident in multifilament and spun fabrics.
Menardi now offers several all-monofilament fabrics designed specifically to reduce the scaling buildup. These fabrics are also designed to regenerate themselves more completely with routine caustic washing practiced in this application. In addition, all fabrics now have specific chemical additives that improve cake release, extend life due to less attack by heat and chemistry and, through specific weave patterns, improve cake release and reduce cake washing at the end of the filter cycle.
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