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In-line removalRemoval of dissolved hydrogenHydrogen and inclusionsInclusions is today standard practice in aluminiumAluminium DC-castingCasting lines. The conventional setup is a degasser followed by a CFFCeramic Foam Filter (CFF) filter box for inclusionInclusions removalRemoval. Sometimes more physical filters for inclusionInclusions removalRemoval may be used downstream the CFFCeramic Foam Filter (CFF) filter. This setup requires a large footprint (space) and represents a high cost for the casthouseCasthouse. To reduce the required footprint and to reduce the capex and opex of melt treatment, a new melt refining unit is developed. In this unit, degassing is done in the same unit as the CFFCeramic Foam Filter (CFF) filtration. In this paper, the measured removalRemoval efficiencies for hydrogenHydrogen and inclusionInclusions are shown for different configurations. A reductionReduction of metalMetals height in the degassing chamber from 950 to 650 mm did not reduce the efficiency of hydrogenHydrogen removalRemoval significantly. Co-current flow gave lower removalRemoval efficiency of hydrogenHydrogen compared to counter-current flow.

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Removal Efficiencies of Hydrogen and Inclusions in a Combined Filter with Degassing and CFF

  • 会议论文

  • 发表日期：

    2025年

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  • Terje Haugen,
  • Arild Håkonsen

摘要

In-line removalRemoval of dissolved hydrogenHydrogen and inclusionsInclusions is today standard practice in aluminiumAluminium DC-castingCasting lines. The conventional setup is a degasser followed by a CFFCeramic Foam Filter (CFF) filter box for inclusionInclusions removalRemoval. Sometimes more physical filters for inclusionInclusions removalRemoval may be used downstream the CFFCeramic Foam Filter (CFF) filter. This setup requires a large footprint (space) and represents a high cost for the casthouseCasthouse. To reduce the required footprint and to reduce the capex and opex of melt treatment, a new melt refining unit is developed. In this unit, degassing is done in the same unit as the CFFCeramic Foam Filter (CFF) filtration. In this paper, the measured removalRemoval efficiencies for hydrogenHydrogen and inclusionInclusions are shown for different configurations. A reductionReduction of metalMetals height in the degassing chamber from 950 to 650 mm did not reduce the efficiency of hydrogenHydrogen removalRemoval significantly. Co-current flow gave lower removalRemoval efficiency of hydrogenHydrogen compared to counter-current flow.