Phosphorus separation from metallurgical-grade silicon by magnesium alloying and acid leaching
Peer reviewed, Journal article
Published version
![Thumbnail](/ntnu-xmlui/bitstream/handle/11250/2679852/1832310%2b1-s2.0-S138358661934780X-main.pdf.jpg?sequence=6&isAllowed=y)
View/ Open
Date
2020Metadata
Show full item recordCollections
- Institutt for materialteknologi [2545]
- Publikasjoner fra CRIStin - NTNU [38050]
Abstract
n this paper, the separation of phosphorus from metallurgical-grade silicon was investigated based on an Mgalloying and HCl leaching approach. Experimental results show that P concentration was reduced from initial15.1ppmwto0.2ppmwwithalsolargeextentremovalofmetallicimpuritiesbytwotimesMgalloying-leachingpurification.ThemechanismofenhancedPseparationisclarifiedowingtothestrongaffinitybetweenMgandP,whichisvalidatedbySIMSelementalmapping.Atwo-parameteranalyticalmodelwasdevelopedtopredicttheP removal degree based on the variables of alloying metal concentration and interaction coefficient betweenalloyingmetalandP.Themodelisvalidatedwith experimentalresultsandtheinteractioncoefficientflg in “iXwasobtainedas−10.8.ThisapproachcanbeappliedtomodeltheremovalofimpuritywhichfollowsGulliver-Scheil solidification from other binary alloying systems. Furthermore, in order to study the effect of appliedalloying-leaching operation times, a model was proposed which establishes the mathematical relationshipsamongkeyprocessingvariableslikeinitialandtargetPconcentrations,theamountofthealloyingmetal,andtheprocess operation times