METHOD FOR REMOVING PHOSPHORUS FROM PHOSPHORUS-CONTAINING SUBSTANCE
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United States of America Patent
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Issued Date -
Mar 11, 2021
app pub date -
Dec 12, 2018
filing date -
Dec 26, 2017
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Abstract
Proposed is a method for removing phosphorus from a phosphorus-containing substance which is applicable in an industrial scale so as to effectively reduce phosphorus contained in the phosphorus-containing substance. In this method, the phosphorus-containing substance used as a raw material for metal smelting or metal refining is reacted with a nitrogen-containing gas at a treatment temperature T (° C.) which is lower than a melting temperature (Tm) of the substance, so that phosphorus is removed preferably in the form of phosphorus nitride (PN). In this regard, a nitrogen partial pressure and an oxygen partial pressure in the nitrogen-containing gas are preferably controlled, thereby reducing a load of dephosphorization process, for example.
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