Skrzekut Tomasz, Piotrowicz Andrzej, Noga Piotr, Wędrychowicz Maciej, Bydałek Adam W
Faculty of Non-Ferrous Metals, AGH University of Science and Technology, 30-059 Krakow, Poland.
Institute of Materials and Biomedical Engineering, Faculty of Mechanical Engineering, University of Zielona Gora, 65-516 Zielona Gora, Poland.
Materials (Basel). 2022 Jun 2;15(11):3966. doi: 10.3390/ma15113966.
Recovery of zinc and manganese from scrapped alkaline batteries were carried out in the following way: leaching in HSO and selective precipitation of zinc and manganese by alkalization/neutralization. As a result of non-selective leaching, 95.6-99.7% Zn was leached and 83.7-99.3% Mn was leached. A critical technological parameter is the liquid/solid treatment (l/s) ratio, which should be at least 20 mL∙g. Selective leaching, which allows the leaching of zinc only, takes place with a leaching yield of 84.8-98.5% Zn, with minimal manganese co-leaching, 0.7-12.3%. The optimal HSO concentration is 0.25 mol∙L. Precipitation of zinc and manganese from the solution after non-selective leaching, with the use of NaOH at pH = 13, and then with HSO to pH = 9, turned out to be ineffective: the manganese concentrate contained 19.9 wt.% Zn and zinc concentrate, and 21.46 wt.% Mn. Better selectivity results were obtained if zinc was precipitated from the solution after selective leaching: at pH = 6.5, 90% of Zn precipitated, and only 2% manganese. Moreover, the obtained concentrate contained over 90% of ZnO. The precipitation of zinc with sodium phosphate and sodium carbonate is non-selective, despite its relatively high efficiency: up to 93.70% of Zn and 4.48-93.18% of Mn and up to 95.22% of Zn and 19.55-99.71% Mn, respectively for NaPO and NaCO. Recovered zinc and manganese compounds could have commercial values with suitable refining processes.
在硫酸中浸出，并通过碱化/中和对锌和锰进行选择性沉淀。由于非选择性浸出，95.6 - 99.7%的锌被浸出，83.7 - 99.3%的锰被浸出。一个关键的工艺参数是液固比（l/s），其应至少为20 mL∙g。仅允许锌浸出的选择性浸出，锌的浸出率为84.8 - 98.5%，锰的共浸出量极少，为0.7 - 12.3%。最佳硫酸浓度为0.25 mol∙L。在非选择性浸出后，使用pH = 13的氢氧化钠然后用硫酸调至pH = 9从溶液中沉淀锌和锰，结果证明效果不佳：锰精矿中含19.9 wt.%的锌，锌精矿中含21.46 wt.%的锰。如果在选择性浸出后从溶液中沉淀锌，可获得更好的选择性结果：在pH = 6.5时，90%的锌沉淀，只有2%的锰沉淀。此外，所得精矿中氧化锌含量超过90%。用磷酸钠和碳酸钠沉淀锌是非选择性的，尽管其效率相对较高：对于磷酸钠和碳酸钠，锌的沉淀率分别高达93.70%和95.22%，锰的沉淀率分别为4.48 - 93.18%和19.55 - 99.71%。通过合适的精炼工艺，回收的锌和锰化合物可以具有商业价值。
