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Abstract

The recovery of low melting point metal bismuth in eco-friendly Bi–S based free cutting steel with different addition methods was studied in laboratory. Maximum recovery was achieved using metal Bi with Bi₂O₃ second, and Bi₂S₃ the worst. Furthermore, the recovery could be further improved significantly by mixing the metal Bi with Fe power in a specific ratio. The recovery was increased with decreasing temperature when the temperature was above 1560°C, and achieved its maximum near the boiling point of bismuth. The loss of bismuth in the molten steel mainly occurred in the first 3 min after the bismuth addition because of the high local concentration and the large local vapour pressure of bismuth in the molten steel, especially in the first minute, but the loss decreased gradually later. Covering the surface of the molten steel with a slag layer of sufficient thickness effectively reduced the evaporation loss of bismuth after 3 min.

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Research on recovery for adding low melting point metal bismuth to eco-friendly Bi–S based free cutting steel

Abstract

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