Controle Override de corrente elétrica para o Aumento de Eficiência do Peneiramento no Processamento Mineral

Kaike S. Albuquerque; Alexandre G. Fonseca; Robson A. Duarte; Rodrigo Fina; Thomás V. B. Pinto; Thiago A. M. Euzébio

doi:10.20906/SBAI-SBSE-2023/3944

Kaike S. Albuquerque Vale S.A. / Programa de Pós-Graduação em Instrumentação, Controle e Automação de Processos de Mineração, Universidade Federal de Ouro Preto (UFOP) e Instituto Tecnológico Vale (ITV), Ouro Preto, MG
Alexandre G. Fonseca Vale S.A.
Robson A. Duarte Vale S.A.
Rodrigo Fina Vale S.A.
Thomás V. B. Pinto Instituto Tecnológico Vale, Ouro Preto, MG / Programa de Pós-Graduação em Instrumentação, Controle e Automação de Processos de Mineração, Universidade Federal de Ouro Preto (UFOP) e Instituto Tecnológico Vale (ITV), Ouro Preto, MG
Thiago A. M. Euzébio Helmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, Dresden / Programa de Pós-Graduação em Instrumentação, Controle e Automação de Processos de Mineração, Universidade Federal de Ouro Preto (UFOP) e Instituto Tecnológico Vale (ITV), Ouro Preto, MG / Universidade Federal de Minas Gerais, Belo Horizonte, MG

DOI: https://doi.org/10.20906/SBAI-SBSE-2023/3944

Keywords: Screening, Override Logic, correlation analysis, natural moisture

Abstract

Processing iron ore with its natural moisture content brings economic, environmental, and operational advantages. This occurs due to the streamlining of processes, typically involving stages of comminution, classification, and handling. However, this method, combined with weather conditions and variations in ore type, poses challenges in processing, mainly due to the high moisture content. This situation often leads to operational shutdowns due to overloads, blockages, and decreased efficiency. In this article, a statistical correlation analysis will be presented, based on industrial data, for the natural moisture screening process. The correlation was performed between the electric current (A) of the screen drive and the physical, chemical and lithological characteristics of the ore. Based on the results of this correlation, the use of this screen current variable is proposed to implement a new regulatory rate control in override and cascade strategy to dynamically protect and adjust the process, replacing manual intervention by the operational team. The work was carried out at Vale’s iron ore beneficiation plant in Canaã dos Carajás, PA, with the aim of optimizing performance and reducing operational shutdowns due to overload. The implementation of the proposed control led to a 67% reduction in undesired stoppage events due to overloads, along with a 5.1% increase in automatic operation time, achieving a rate of 98.5% of the total time in automatic mode for the primary screening rate control at Serra Sul.