RESUMOAs usinas de beneficiamento mineral da Vale utilizam diferentes tipos de circuitos de bombeamento, para a dosagem de reagentes na flotação. Os mais comumente utilizados são os circuitos com bombas centrífugas, bombas de diafragma e bombas peristálticas. Outras alternativas ainda podem ser utilizadas, como bombas helicoidais, dosadores de canecas e dosagem direto dos tambores de estocagem (regulagem manual). Este estudo visa avaliar tecnicamente algumas das alternativas disponíveis no mercado e apresentar os resultados de uma avaliação industrial comparando um circuito com bomba peristáltica e um circuito com bombas centrifugas e de diafragma, todos operando em paralelo. Os resultados mostram que os três tipos de circuitos atendem as demandas operacionais de controle da dosagem de reagentes. O circuito com bombas peristálticas, no entanto, se mostrou menos complexo e de menor custo. PALAVRAS--CHAVE:Flotação, Cobre, Dosagem de reagentes. TECHNICAL EVALUATION OF REAGENT DOSING PUMPING SYSTEMS IN FLOTATION CIRCUITS ABSTRACTVale's ore processing plants use different types of pumping circuits for flotation reagent dosing. Most commonly, circuits with centrifugal pumps, diaphragm pumps, and peristaltic pumps are used. Alternative arrangements can also be used, such as helical pumps and direct dosing from reagent storage drums (with manual or automatic dosing systens). This study aims to technically evaluate some of the alternatives available in the marketplace and present the results of an industrial evaluation comparing a peristaltic pump circuit to a circuit with centrifugal and diaphragm pumps, all operating in parallel. The results showed that the three types of circuits meet the operational requirements of reagent dosing control. However, the peristaltic pump circuit has proven to be less complex and costly.
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