Tecnologia em Metalurgia, Materiais e Mineração
https://www.tecnologiammm.com.br/article/doi/10.4322/tmm.00701011
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

EFFECT OF IRON ON ENERGY CONSUMPTION AND CURRENT EFFICIENCY OF ZINC ELECTROWINNING FROM SULFACE SOLUTIONS

EFEITO DO FERRO NO CONSUMO DE ENERGIA E EFECIÊNCIA DE CORRENTE DA ELETRÓLISE DO ZINCO A PARTIR DE SOLUÇÕES

Lins, Vanessa de Freitas C.; Abelha, Renata; Castro, Maria das Mercês R. de; Souza, Maria Maciel D. de; Moraes, Leticia Lanza de; Araújo, Carlos Roberto; Matencio, Tulio

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Abstract

Electrolytic zinc used in galvanizing processes is obtained using zinc electrowinning from sulfate solutions. The presence of impurities in the electrolyte is a major problem for the zinc electrowinning industry. The impurities on zinc electrolysis can reduce the current efficiency and increase the energy consumption. In this work, the effect of iron on the zinc electrodeposition using galvanostatic deposition and cyclic voltammetry is studied. Contents of 5, 10, and 15 mg.L-1 of iron were added in the electrolyte of zinc sulfate and in an industrial acid electrolyte. Using the industrial electrolyte, iron addition is detrimental to the zinc electrowinning, increasing the energy consumption and decreasing the current efficiency.

Keywords

Electrolysis, Energy consumption, Electrolytic zinc

Resumo

O zinco eletrolítico usado nos processos de galvanização é obtido através da eletrólise do zinco a partir de soluções sulfatadas. A presença de impurezas no eletrólito é o maior problema para a eletrólise do zinco industrial. As impurezas na eletrólise do zinco podem reduzir a eficiência de corrente e aumentar o consumo de energia. Neste trabalho é estudado o efeito do ferro na eletrodeposição do zinco, usando deposição galvanostática e voltametria cíclica. Foram adicionadas ao eletrólito de sulfato de zinco e a um eletrólito ácido industrial 5, 10 e 15 mg.L-1 de ferro. No eletrólito ácido industrial a adição de ferro é prejudicial para a eletrólise do zinco, aumentando o consumo de energia e diminuindo a eficiência de corrente.

Palavras-chave

Eletrólise, Consumo de energia, Zinco eletrolítico

Referências

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