Department of Environmental Engineering, Suleyman Demirel University, 32260 Isparta, Turkey.
J Hazard Mater. 2010 Jan 15;173(1-3):137-43. doi: 10.1016/j.jhazmat.2009.08.063. Epub 2009 Aug 22.
The main objective of this study was to investigate the effects of reductive acidic leaching and further precipitation on the recovery of manganese and zinc from spent alkaline and zinc-carbon battery powders. Ascorbic acid (AA), citric acid (CA) and oxalic acid (OA) were tested as the reductants. Sodium hydroxide and potassium hydroxide were used as precipitating agents. OA with H(2)SO(4) or HCl was not effective on the leaching of zinc due to the formation of zinc oxalate precipitates. However, the other reducing agents (CA and AA) tested under various experimental conditions were effective in the acidic leaching of both zinc and manganese. Leaching yields of both manganese and zinc were higher at leach temperature of 90 degrees C than those at 30 degrees C. Leach solutions were purified by the selective precipitation of manganese and zinc using KOH or NaOH. Complete precipitation was obtained for Mn at pH 9-10 and for Zn at pH 7-8. The use of ascorbic acid or citric acid as reductants in acidic leaching appears to be effective in the simultaneous leaching and further recovery of zinc and manganese from spent alkaline and zinc-carbon battery powders.
本研究的主要目的是研究还原酸性浸出和进一步沉淀对从废碱性和锌碳电池粉末中回收锰和锌的影响。抗坏血酸（AA）、柠檬酸（CA）和草酸（OA）被测试为还原剂。氢氧化钠和氢氧化钾被用作沉淀剂。由于形成草酸锌沉淀，OA 与 H(2)SO(4)或 HCl 对锌的浸出没有效果。然而，在各种实验条件下测试的其他还原剂（CA 和 AA）在酸性浸出锌和锰方面都是有效的。在 90°C 的浸出温度下，锰和锌的浸出率均高于 30°C 的浸出率。用 KOH 或 NaOH 对浸出液进行净化，通过选择性沉淀锰和锌。在 pH 9-10 下可完全沉淀 Mn，在 pH 7-8 下可完全沉淀 Zn。在酸性浸出中使用抗坏血酸或柠檬酸作为还原剂似乎可有效地同时浸出和进一步回收废碱性和锌碳电池粉末中的锌和锰。
