ResumoO presente trabalho teve como objetivo comparar o desempenho de processo entre espirais convencionais e espirais de grande diâmetro, na concentração de minérios de ferro. Foram realizadas campanhas de testes para levantar os dados necessários para comparar os dois modelos de espirais em estudo. Os resultados mostraram que as principais variáveis que afetaram a eficiência de separação nas espirais foram a abertura dos lemes e a concentração de sólidos na alimentação. A espiral de grande diâmetro obteve resultados melhores, mesmo sem a utilização de água de lavagem, porém mais testes serão necessários para uma conclusão definitiva. Palavras-chave: Separação gravimétrica; Espirais concentradoras; Minério de ferro. CASE STUDY: CONVENTIONAL SPIRALS X LARGE DIAMETER SPIRALS AbstractThis study aimed to compare the process performance between conventional and large diameter spirals, in the concentration of iron ore. Tests were carried out to obtain the necessary data to compare the two kinds of spirals. The results show that the main variables affecting the separation efficiency in the spirals are the splitters open and the solids concentration in the feed. The large diameter spiral achieved better results, even without the use of wash water, but more tests are needed for a definitive conclusion.
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