School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, 1037 Luoyu Road, Wuhan, Hubei 430074, China.
School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, 1037 Luoyu Road, Wuhan, Hubei 430074, China.
Waste Manag. 2023 Jun 15;165:51-58. doi: 10.1016/j.wasman.2023.04.022. Epub 2023 Apr 19.
A one-step spray pyrolysis process is investigated for the first time in the field of spent lead-acid batteries (LABs) recycling. The spent lead paste that derived from spent LAB is desulfurized and then leached to generate the lead acetate (Pb(Ac)) solution, which is then sprayed directly into a tube furnace to prepare the lead oxide (PbO) product by pyrolysis. The low-impurity lead oxide product (9 mg/kg Fe and 1 mg/kg Ba) is obtained under the optimized conditions (the temperature of 700 °C, the pumping rate of 50 L/h, and the spray rate of 0.5 mL/min). The major crystalline phases of the synthesized products are identified to be α-PbO and β-PbO. In the spray pyrolysis process, Pb(Ac) droplets are sequentially transformed into various intermediate products: HO(g)@Pb(Ac) solution, Pb(Ac) crystals@PbO, and the final PbO@C product. Owning its carbon skeleton structure, the recovered PbO@C product (carbon content of 0.14%) shows better performance than the commercial ball-milled lead oxide powder in battery tests, with higher initial capacity and better cycling stability. This study could provide a strategy for the short-route recovery of spent LABs.
本文首次在废铅酸电池（LAB）回收领域研究了一步喷雾热解工艺。将废 LAB 得到的废铅膏脱硫，然后浸出，得到乙酸铅（Pb（Ac））溶液，然后直接将其喷入管式炉中，通过热解制备氧化铅（PbO）产品。在优化条件下（温度为 700°C，抽气率为 50 L/h，喷雾率为 0.5 mL/min），可获得低杂质氧化铅产品（9mg/kgFe 和 1mg/kgBa）。合成产物的主要晶相被鉴定为α-PbO 和β-PbO。在喷雾热解过程中，Pb（Ac）液滴依次转化为各种中间产物：HO（g）@Pb（Ac）溶液、Pb（Ac）晶体@PbO 和最终的 PbO@C 产物。回收的 PbO@C 产物（碳含量为 0.14%）具有碳骨架结构，其在电池测试中的性能优于商业球磨氧化铅粉末，具有更高的初始容量和更好的循环稳定性。本研究为废 LAB 的短流程回收提供了一种策略。
