Metall. Res. Technol.
Volume 116, Number 4, 2019
|Number of page(s)||7|
|Published online||29 May 2019|
Selective separation of copper from copper-smelting waste acid by potential control
School of Metallurgy and Environment, Central South University,
410083, PR China
* e-mail: firstname.lastname@example.org
Accepted: 3 December 2018
An oxidation-sulfidation process by potential control was proposed for the separation of the Cu from copper-smelting waste acid (CSWA). This process consists of two steps: the oxidation of As (III) and the sulfidation of Cu by potential control. For the oxidation step, the oxidation efficiency of As (III) reached 99.4% under the following optimal conditions: a potential of 820 mV, temperature of 25 °C, and reaction time of 10 min. Subsequently, Na2S solution was pumped to the oxidized-CSWA and 99.4% of the Cu and 1.8% of the As were precipitated under the following optimal conditions: a potential of 508 mV, temperature of 25 °C, initial pH of 1.0, and reaction time of 30 min. It is confirmed that, the oxidation of As is the pre-requisite step for the selective separation of the Cu from CSWA via the sulfidation process. Therefore, the novel process realized a selective separation of the Cu, as well as provided an alternative option for the treatment of non-ferrous smelting waste acid.
Key words: copper smelting waste acid / potential / oxidation / sulfidation / Cu
© EDP Sciences, 2019
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