Nuclear Chemistry and Industrial Material Recycling, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, S-412 96 Gothenburg, Sweden.
Nuclear Chemistry and Industrial Material Recycling, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, S-412 96 Gothenburg, Sweden.
Waste Manag. 2016 May;51:157-167. doi: 10.1016/j.wasman.2015.10.029. Epub 2015 Nov 5.
Production of zinc and manganese oxide particles from alkaline and zinc-carbon battery black mass was studied by a pyrolysis process at 850-950°C with various residence times under 1L/minN2(g) flow rate conditions without using any additive. The particular and chemical properties of the battery waste were characterized to investigate the possible reactions and effects on the properties of the reaction products. The thermodynamics of the pyrolysis process were studied using the HSC Chemistry 5.11 software. The carbothermic reduction reaction of battery black mass takes place and makes it possible to produce fine zinc particles by a rapid condensation, after the evaporation of zinc from a pyrolysis batch. The amount of zinc that can be separated from the black mass is increased by both pyrolysis temperature and residence time. Zinc recovery of 97% was achieved at 950°C and 1h residence time using the proposed alkaline battery recycling process. The pyrolysis residue is mainly MnO powder with a low amount of zinc, iron and potassium impurities and has an average particle size of 2.9μm. The obtained zinc particles have an average particle size of about 860nm and consist of hexagonal crystals around 110nm in size. The morphology of the zinc particles changes from a hexagonal shape to s spherical morphology by elevating the pyrolysis temperature.
从碱性和锌碳电池黑粉中通过热解工艺在 850-950°C 下以 1L/minN2(g)流速条件下在不同的停留时间下生产氧化锌和氧化锰颗粒，而不使用任何添加剂。对电池废料的特殊和化学性质进行了表征，以研究可能的反应及其对反应产物性能的影响。使用 HSC Chemistry 5.11 软件研究了热解过程的热力学。电池黑粉中的碳热还原反应发生，使得通过快速冷凝从热解批次中蒸发锌后可以生产出细锌颗粒。通过提高热解温度和停留时间，可以增加从黑块中分离出的锌的量。使用所提出的碱性电池回收工艺，在 950°C 和 1h 停留时间下，锌的回收率达到 97%。热解残渣主要为 MnO 粉末，含有少量锌、铁和钾杂质，平均粒径为 2.9μm。所得锌颗粒的平均粒径约为 860nm，由 110nm 左右大小的六方晶体组成。通过提高热解温度，锌颗粒的形态从六方形状变为球形。
