Abstract
The enrichment behavior of phosphorus in CaO-SiO 2-FeO x -P 2O 5 slag was studied by making an investigation on the distribution of phosphorous content in the CaO-SiO 2-FeO x -P 2 O 5 molten slag. The research results showed that the 2CaO • SiO 2 solid particles existing in molten slag were the condensation sites for the phosphorus enrichment. The enrichment process of phosphorus in the molten slag can be recognized as three substeps: mass transfer of phosphorus from bulk slag to the surface of 2CaO • SiO 2 particle, superficial solid solution reaction of phosphorus around the 2CaO • SiO 2 particle, and diffusion of phosphorus through the product layer of 2CaO • SiO 2-3CaO • P 2O 5 solid solution to the inner of 2CaO • SiO 2 particle. Moreover, higher temperature is favorable to the phosphorous enrichment from molten bulk slag to the 2CaO • SiO 2 particles.
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