Chai Lulu, Li Zhiyu, Wang Keyu, Liu Xiaowei, Dai Shaozhen, Liu Xiaoguang, Sun Yanzhi, Pan Junqing
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.
Chilwee Power Group, Changxing, Zhejiang, 313100, China.
Adv Sci (Weinh). 2023 Dec;10(34):e2304863. doi: 10.1002/advs.202304863. Epub 2023 Oct 22.
The new low-cost clean pre-desulfation technology is very important in pyrometallurgy and hydrometallurgy. However, traditional reactors have low space-time yield and desulfation rate, resulting in high energy consumption and SO emissions in the industrial desulfation processes. Herein, dual rotating liquid film reactors (RLFRs) and lime are proposed to construct a recyclable, ultra-fast, and value-added desulfation method. Parameter optimization and kinetic calculations prove that the above reactions are controlled by internal diffusion, revealing that RLFR promotes the mass transfer and reaction rate. The new process greatly shortens the desulfation time of lead paste from 40 min to 10 s with a high desulfation rate of 99.7%, and the sulfation time of lime from 30 min to 30 s with a sulfation rate of 98.6% with a net profit of 55.99 ¥/ton by cost accounting. Moreover, ten batches of continuous scale-up experiments demonstrate the stability of processes, the desulfation and sulfation rates are kept at 99.7% and 98.2%, which greatly reduces the emissions of waste desulfate liquor. This work provides a new universal strategy for a sustainable, low-cost, and clean desulfation method of waste resources to achieve technical and economic feasibility.
新型低成本清洁预脱硫技术在火法冶金和湿法冶金中非常重要。然而，传统反应器的时空产率和脱硫率较低，导致工业脱硫过程中能耗高且二氧化硫排放量大。在此，提出了双旋转液膜反应器（RLFRs）和石灰来构建一种可循环、超快速且增值的脱硫方法。参数优化和动力学计算证明上述反应受内扩散控制，这表明RLFR促进了传质和反应速率。新工艺大大缩短了铅膏的脱硫时间，从40分钟缩短至10秒，脱硫率高达99.7%；石灰的硫酸化时间从30分钟缩短至30秒，硫酸化率为98.6%，成本核算净利润为55.99元/吨。此外，十批次的连续放大实验证明了工艺的稳定性，脱硫率和硫酸化率分别保持在99.7%和98.2%，大大减少了废脱硫液的排放。这项工作为实现可持续、低成本且清洁的废资源脱硫方法提供了一种新的通用策略，以实现技术和经济可行性。
