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- Title
Leaching Process and Mechanism of Manganese from Electrolytic Manganese Slag by Citric Acid.
- Authors
ZHANG Huanhuan; FANG Shuangming; FU Juan; CHENG Jinke
- Abstract
The concentration of manganese in electrolytic manganese slag is higher, which not only wastes manganese resources, but also will restrict the comprehensive utilization of manganese residue. The high efficiency leaching of manganese from manganese residue with citric acid as additive can promote the resource utilization of manganese residue and the green and low-carbon development of electrolytic manganese industry. The influence of leaching parameters on the manganese leaching concentration in manganese slag was studied. A manganese leaching model was established by analyzing the phase, structure, valence, morphology and kinetics, and the leaching mechanism was discussed. The results show that when the citric acid content is 25% (mass fraction), the liquid-solid ratio is 5:1, and the leaching time is 30 min, the manganese leaching effect is better, and the leaching rate is 93.6%. The kinetics of manganese leaching is in accordance with the shrinking core model, which is controlled by the mixture of chemical reaction and solid film. The high valence manganese is reduced to the divalent manganese by citric acid, and then the divalent manganese and citric acid coordinate to form a chelate in the form of 1:2, in which the carboxyl and hydroxyl groups of citric acid molecules jointly participate in bonding.
- Subjects
ELECTROLYTIC manganese; CITRIC acid; LEACHING; MANGANESE industry; SLAG
- Publication
Bulletin of the Chinese Ceramic Society, 2023, Vol 42, Issue 6, p2071
- ISSN
1001-1625
- Publication type
Article