Calcium-silicate based slag for treatment of molten silicon
AssigneeElkem ASA
InventorsErik ENEBAKK, Gabriella Maria TRANELL, Ragnar TRONSTAD
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Abstract
The present invention relates to a calcium-silicate based slag having a phosphorous content of less than 3 ppmw. The invention further relates to a method for producing a low phosphorous calcium-silicate based slag, where molten calcium-silicate based slag is treated with a molten ferrosilicon alloy in a vessel, whereby phosphorous in the calcium-silicate based slag is transferred to the ferrosilicon alloy, and a low phosphorous calcium-silicate to based slag is removed from the vessel.
Claims11
1-5. (canceled)
A method for producing a low phosphorous calcium-silicate based slag for treatment of molten silicon in order to remove boron and phosphorous, characterized in that the molten calcium-silicate based slag is treated with a molten ferrosilicon alloy in a vessel, whereby phosphorous in the calcium-silicate based slag is transferred to the ferrosilicon alloy, and removing a calcium-silicate based slag containing less than 3 ppmw phosphorous from the vessel.
Dependencies are inferred from the claim text.