Emprego de CO2 no espessamento de concentrado de espodumênio
Application of CO2 in the thickening of spodumene concentrate
Pedro Henrique Medeiros da Mata, Adriane Aparecida de Melo, Guilherme José Ramos Oliveira, Daniela Gomes Horta
Resumo
O CO2 é empregado como regulador de pH em processos industriais. No entanto, sua aplicação em operações de processamento mineral em escala industrial se restringe a poucos trabalhos da literatura. Nosso objetivo foi investigar a ação de CO2 no espessamento de concentrado de espodumênio, em comparação a um agente coagulante comercial. Os testes foram realizados em circuito industrial por meio da variação da dosagem de coagulante e vazão de CO2 no espessador de concentrado. Durante os testes, foram coletadas amostras do overflow para a determinação de pH, turbidez e sólidos totais. O emprego de CO2 gerou resultados mais satisfatórios, com menor turbidez e concentração de sólidos totais, em comparação ao coagulante. A quantidade de sólidos totais reduziu de 13400 mg/L com o coagulante para 523 mg/L com o CO2 . Isto pode significar um aumento de 83 t/mês de concentrado no underflow do espessador. Assim, este trabalho mostrou, de forma exploratória, a possibilidade de substituição de coagulantes por CO2 no desaguamento de polpas em uma usina de beneficiamento de espodumênio.
Palavras-chave
Abstract
CO2 is employed as a pH regulator in industrial processes. However, its application in mineral processing operations at an industrial scale is restricted to a few works in the literature. Our objective was to investigate the use of CO2 on the thickening of spodumene concentrate, in comparison to a commercial coagulating agent. The tests were carried out in an industrial circuit by varying the coagulant dosage and CO2 flow rate in the concentrate thickener. For this, overflow samples were collected to determine pH, turbidity, and total solids. The use of CO2 caused more satisfactory results, with lower turbidity and concentration of total solids, compared to the coagulant. The amount of total solids reduced from 13,400 mg/L with the coagulant to 523 mg/L with CO2 . This could mean an increase of 83 t/month of concentrate in the thickener underflow. Thus, this work showed in an exploratory way the possibility of replacing coagulants with CO2 in the dewatering of pulps at a spodumene beneficiation plant.
Keywords
References
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Submitted date:
10/29/2023
Accepted date:
05/13/2024
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