Reduction of SiO₂ Content in Iron Ore Concentrate by High-Frequency Screening

Objective: To investigate the application of high-frequency screening in iron ore processing circuits aiming at reducing SiO₂ content. Theoretical Framework: The theoretical framework addresses the concepts of classification and screening, highlighting the importance of screens according to the ore particle size. The evolution of high-frequency screening and its technical limitations are presented. The Derrick Corporation Stack Sizer is presented as an efficient innovation for screening fine particles. Method: The methodology adopted is based on the analysis of data obtained through systematic sampling in an iron ore processing plant. Results and Discussion: The results indicate an average reduction of 12.56% in SiO₂ content with the adoption of high-frequency screening, demonstrating that high-frequency screening represents a promising innovation in iron ore processing. Its application provided significant increases in metallurgical recovery and higher Fe content. Research Implications: The high separation capacity in critical particle size ranges and the improvement in selectivity position high-frequency screening as a possible strategy for mineral processing plants seeking greater productivity and quality of the final concentrate. Originality/Value: This work presents unprecedented results on the reduction of SiO₂ content in iron ore flotation concentrate using high-frequency screening.