Dissolution mechanism of the oxidation process of covellite by ferric and ferrous ions

Yu, Shichao; Yang, Baocheng; Fang, Chaojun; Zhang, Yisheng; Liu, Shitong; Zhang, Yansheng; Xie, Jianping; Wang, Jun

doi:10.1016/j.hydromet.2021.105585

Cited by 7 publications

(1 citation statement)

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“…Temperature is an important factor affecting the hydrolysis and precipitation of the metal ions. It has been widely reported that the hydrolysis of ferric ions is sensitive to temperature [19][20][21]. Therefore, it is inferred that the enhanced hydrolysis of the ferric ions at high temperature kept the concentration of ferric ions in the solution low so as to promote the oxidation of ferrous ions, though the solubility of oxygen decreased with the increase of temperature.…”

Section: Influence Of Temperature On the Oxidation Of Ferrous Ionsmentioning

confidence: 99%

Strengthened Oxygen Oxidation of Ferrous Ions by A Homemade Venturi Jet Microbubble Generator towards Iron Removal in Hydrometallurgy

Niu

Lin³

et al. 2021

Minerals

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Iron normally exists in the form of ferrous ion (Fe2+) in primary ore deposits of valuable metals. To remove iron from hydrometallurgical leaching solution or suspension by precipitation, ferrous ion should be oxidized to ferric ion (Fe3+) first. Due to the low oxidation rate of Fe2+ by the traditional oxygen oxidation method, industry has to use more agitating barrels, steam, and compressed gas, as well as a larger workshop area, which dramatically increases the equipment investment and operation costs. In this study, a strengthened oxygen oxidation method for Fe2+ using a homemade venturi jet microbubble generator is proposed. Microbubbles of air, oxygen, or oxygen-enriched air can be formed in the leaching solution or suspension, which can greatly improve the dissolved oxygen content in the solution and increase the gas-liquid contact area, thereby accelerating the oxygen oxidation rate of Fe2+ to Fe3+ and realizing the rapid iron removal of the leaching solution or suspension. By measuring the residual concentration of Fe2+ in the solution after oxidation reaction, it was found that the pump power, solution temperature, pH, concentration of Cu2+, and solution flow rate had great effects on the oxidation performance of the produced microbubble. By analyzing the images of the microbubbles and measuring the dissolved oxygen content in the solution, it is confirmed that the accelerated oxidation reaction rate of Fe2+ using the new proposed method was mainly due to the increase of the dissolved oxygen amount in the solution. Moreover, this method can significantly increase the purification depth of iron ion, expand production capacity, and decrease energy consumption.

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Section: Influence Of Temperature On the Oxidation Of Ferrous Ionsmentioning

confidence: 99%