ISSN 2594-5300
51° Seminário de Fusão, Refino e Solidificação de Metais — vol. 51, num.51 (2022)
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TIN IS A METAL USED IN SEVERAL APPLICATIONS AND IS EVEN CONSIDERED A CRITICAL MATERIAL IN SOME COUNTRIES DUE TO ITS ECONOMIC IMPORTANCE AND SUPPLY CHAIN RISKS. THESE RISKS MAY IMPACT RAW MATERIAL AVAILABILITY AND THEREFORE, IT IS IMPORTANT THAT COMPANIES SEARCH NOT ONLY FOR NEW SOURCES, BUT ALSO TO ENHANCE TIN YIELD AND TO OPTIMIZE THE RECOVERY FROM ALREADY EXISTENT MATERIALS. IN THIS CONTEXT, COMPLEX TIN SLAGS WITH HIGH ZRO2 AND SIGNIFICANT LEVELS OF TIN EVEN AFTER REPROCESSING HAVE BEEN REPORTED IN LITERATURE. THE RECOVERY OF TIN FROM THESE SLAGS CAN HELP TO PROVIDE MORE TIN TO THE MARKET AND HAS BEEN STUDIED IN THIS WORK THROUGH A TEST IN AN EAF. SLAG’S MELTING POINT HAS BEEN ACCESSED THROUGH A CAO.SIO2.ZRO2 PHASE DIAGRAM AND COMPARED TO LITERATURE DATA. ACCORDING TO TEMPERATURE MEASUREMENTS AND SLAG COMPOSITION, IT IS INDICATED THAT THE SLAG IS NOT COMPLETELY FLUID AT WORKING TEMPERATURES. THIS FACT CAN BE ASSOCIATED TO A HIGH TIN LOSS IN THE SLAG PHASE AND FURTHER DILUTION OF ZRO2 IS REQUIRED TO ACHIEVE FLUID PHASE OF SLAG. THE VISCOSITY OF THE TIN SLAG AND THE EFFECT OF ADDITIONS HAS ALSO BEEN STUDIED THROUGH FOUR MODELS (URBAIN, RIBOUD, IIDA AND OPTICAL BASICITY). CONTRASTING RESULTS WERE OBTAINED FOR THE EFFECT OF ZRO2 ON THE VISCOSITY AND ARE RELATED TO A DIVERGENCE REGARDING THE ROLE OF ZRO2 AS A SLAG FORMER OR MODIFIER. THESE MODELS ALSO INDICATE THAT THE ADDITION OF SIO2 INCREASES VISCOSITY, WHILE THE ADDITION OF CAO OR FEO DIMINISHES THE VISCOSITY OF THE TIN SLAG.
TIN IS A METAL USED IN SEVERAL APPLICATIONS AND IS EVEN CONSIDERED A CRITICAL MATERIAL IN SOME COUNTRIES DUE TO ITS ECONOMIC IMPORTANCE AND SUPPLY CHAIN RISKS. THESE RISKS MAY IMPACT RAW MATERIAL AVAILABILITY AND THEREFORE, IT IS IMPORTANT THAT COMPANIES SEARCH NOT ONLY FOR NEW SOURCES, BUT ALSO TO ENHANCE TIN YIELD AND TO OPTIMIZE THE RECOVERY FROM ALREADY EXISTENT MATERIALS. IN THIS CONTEXT, COMPLEX TIN SLAGS WITH HIGH ZRO2 AND SIGNIFICANT LEVELS OF TIN EVEN AFTER REPROCESSING HAVE BEEN REPORTED IN LITERATURE. THE RECOVERY OF TIN FROM THESE SLAGS CAN HELP TO PROVIDE MORE TIN TO THE MARKET AND HAS BEEN STUDIED IN THIS WORK THROUGH A TEST IN AN EAF. SLAG’S MELTING POINT HAS BEEN ACCESSED THROUGH A CAO.SIO2.ZRO2 PHASE DIAGRAM AND COMPARED TO LITERATURE DATA. ACCORDING TO TEMPERATURE MEASUREMENTS AND SLAG COMPOSITION, IT IS INDICATED THAT THE SLAG IS NOT COMPLETELY FLUID AT WORKING TEMPERATURES. THIS FACT CAN BE ASSOCIATED TO A HIGH TIN LOSS IN THE SLAG PHASE AND FURTHER DILUTION OF ZRO2 IS REQUIRED TO ACHIEVE FLUID PHASE OF SLAG. THE VISCOSITY OF THE TIN SLAG AND THE EFFECT OF ADDITIONS HAS ALSO BEEN STUDIED THROUGH FOUR MODELS (URBAIN, RIBOUD, IIDA AND OPTICAL BASICITY). CONTRASTING RESULTS WERE OBTAINED FOR THE EFFECT OF ZRO2 ON THE VISCOSITY AND ARE RELATED TO A DIVERGENCE REGARDING THE ROLE OF ZRO2 AS A SLAG FORMER OR MODIFIER. THESE MODELS ALSO INDICATE THAT THE ADDITION OF SIO2 INCREASES VISCOSITY, WHILE THE ADDITION OF CAO OR FEO DIMINISHES THE VISCOSITY OF THE TIN SLAG.
Palavras-chave
Tin slags; Viscosity models; Tin recovery; ZrO2 slags
Tin slags; Viscosity models; Tin recovery; ZrO2 slags
Como citar
Clemente, Daniel Mapa;
Silva, Carlos Antônio da;
Oliveira, Marivaldo Júnior Monteiro de;
Peixoto, Johne Jesus Mol.
RECOVERY OF TIN FROM HIGH ZRO2 TIN SLAGS
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p. 367-380.
In: 51° Seminário de Fusão, Refino e Solidificação de Metais,
São Paulo,
2022.
ISSN: 2594-5300
, DOI 10.5151/2594-5300-34539
