ISSN 2594-357X
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Abstract
The phosphorus element is found in sensitive contents on steels, as a result of contamination of raw material, in which is usually an undesirable impurity. It is harmful to the quality of steel especially because it reinforces the tendency to the segregation, increasing the hardness of the ferrite phase and the tendency to fragility of the steels. The leaching process is the most promising process for the reaction of iron ore dephosphorization given the formation of phosphoric acid after the leaching process the present study aims to study the effect of pH variation in the reduction of phosphorus content in iron ore. Through the process of X-ray diffraction using the Rietveld method it was demonstrated that the sample is formed by 72.89% Hematite; kaolinite 4.64%; Quartz 12.5; Gibbsite 3.18% and Goethite 7.25%. Diagrams of speciation shows the salt formation FePO4.2H2O and its precipitation in the pH around 5. It is also demonstrated that at concentrations from 0.1 M there is loss of phosphorus content in the sample of iron ore and Pourbaix diagram shows the way of the element Fe passivated as Fe2O3 and Fe3O4 value of from pH 3.
The phosphorus element is found in sensitive contents on steels, as a result of contamination of raw material, in which is usually an undesirable impurity. It is harmful to the quality of steel especially because it reinforces the tendency to the segregation, increasing the hardness of the ferrite phase and the tendency to fragility of the steels. The leaching process is the most promising process for the reaction of iron ore dephosphorization given the formation of phosphoric acid after the leaching process the present study aims to study the effect of pH variation in the reduction of phosphorus content in iron ore. Through the process of X-ray diffraction using the Rietveld method it was demonstrated that the sample is formed by 72.89% Hematite; kaolinite 4.64%; Quartz 12.5; Gibbsite 3.18% and Goethite 7.25%. Diagrams of speciation shows the salt formation FePO4.2H2O and its precipitation in the pH around 5. It is also demonstrated that at concentrations from 0.1 M there is loss of phosphorus content in the sample of iron ore and Pourbaix diagram shows the way of the element Fe passivated as Fe2O3 and Fe3O4 value of from pH 3.
Keywords
Reduction of phosphorus; Iron ore; Phosphoric acid.
Reduction of phosphorus; Iron ore; Phosphoric acid.
How to refer
Silva, Leonardo Martins da;
Castro, José Adilson de;
Nascimento, Marisa;
Neuman., Reiner.
EVALUATION OF PH IN REDUCING THE CONTENT OF
IRON IN THE LEACHING OF PHOSPHORUS IN IRON
,
p. 69-79.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-21353
