Na_2CO_3, Na_2SO_4 および K_2CO_3 による高炭フェロクロム粒の脱りん

概要

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High carbon ferrochromium particles weighing 3g were tested for dephosphorization by sodium carbonate, sodium sulfate, potassium carbonate and their mixtures in the temperature range 730 to 1200℃ in a nickel crucible. 60% of phosphorus was removed from the samples with 0.3mm in diameter using the flux of 0.5 to 0.8g. Diffusion of phosphorus in the solid metal was found to be rate-determining. The carbonates and sulfate oxidized, pulverized ferrochromium particles and enhanced dephosphorization. The optimum temperature was 1000 to 1100℃, but rephosphorization occured at higher temperatures following the initial dephosphorization due to the vaporization and the decomposition of the fluxes. The dephosphorization capability was in the order of sodium sulfate, potassium carbonate and sodium carbonate. Phosphorus in the fluxes was water-soluble and recovered completely. Inert atmosphere prevented ferrochromium from oxidation.
社団法人日本鉄鋼協会の論文
1980-12-01