Behavior of Desulfurization and Dephosphorization of Molten Copper Alloy by Soda Ash

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  • ソーダ灰による銅合金溶湯からの脱硫・脱りん挙動
  • ソーダバイ ニ ヨル ドウ ゴウキン ヨウトウ カラ ノ ダツリュウ ダツリン

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Desulfurizing experiments were conducted at 1473 K for a molten Cu-8%Sn-0.1%P alloy by using a Na2CO3 flux in low freqency melting furnaces. Desulfurization and dephosphorization began simultaneously. Desulfurization ceased earlier than dephosphorization and then the reversion of sulfur was found proceed. The use of carbon crucible promoted desulfurization and suppressed the reversion of sulfur more strongly compared with the use of an alumina crucible. Sulfur distribution between the melt and the flux was found to be determined by two major factors. One is the basicity of the flux, being affected by P2O5 content in the flux. The other is the partial pressure of oxygen at the interface between the melt and the flux, being affected by furnace materials, covering materials and Cu2O content in the flux. The desulfurization rate was explained quantitatively by a double interface model assuming mass transfer coefficient in the melt as 1.82 g·cm−2· s−1 and that in the flux as 0.063 g·cm−2· s−1. Dephosphorization and the influence of Cu2O content in the flux were also investigated.

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