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首页> 外文期刊>Journal of Cleaner Production >Design of a novel membrane-integrated waste acid recovery process from pickling solution
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Design of a novel membrane-integrated waste acid recovery process from pickling solution

机译：一种新型的酸洗液膜集成废酸回收工艺的设计

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Hydrochloric acid pickling is a common practice in steel manufacturing industry. During the process, acid is consumed to dissolve surface oxides and metals ions are accumulated in the solution, which becomes less effective with time. In addition, the costly and risky waste acid disposal is another issue affecting the hot-dip galvanizing industry.In this work, a novel sustainable waste acid recovery process from pickling solutions based on circular approach is proposed to tackle these issues. The innovative system allows (i) the continuous regeneration of pickling solutions to enhance process rate and performance and (ii) minimise the highly expensive and environmentally risky wastewater disposal. In this way, refilling pickling baths with fresh acid, as done in conventional operation, can be avoided and can be carried out continuously under optimal working conditions. Moreover, the recovery of valuable substances (e.g. metal hydroxide or salts solution) can be obtained as an additional benefit. Continuous treatment and regeneration of pickling solution can be accomplished by coupling diffusion dialysis (DD) and membrane distillation (MD) technologies with a reactive precipitation unit where iron ions can be separated from the zinc-rich solution, in order to recover valuable products.To this purpose, a steady state process simulator was developed to predict the operation of the proposed integrated process. (C) 2019 Elsevier Ltd. All rights reserved.
机译：盐酸酸洗是钢铁制造业中的普遍做法。在此过程中，酸被消耗以溶解表面氧化物，并且金属离子累积在溶液中，随着时间的流逝，其有效性降低。此外，昂贵且危险的废酸处理是影响热浸镀锌行业的另一个问题。在这项工作中，提出了一种基于循环方法的酸洗解决方案中可持续的废酸回收新方法，以解决这些问题。创新的系统允许（i）酸洗溶液的连续再生，以提高处理速度和性能，以及（ii）尽量减少昂贵且具有环境风险的废水处理。这样，可以避免像常规操作中那样用新鲜酸重新填充酸洗槽，并且可以在最佳工作条件下连续进行。此外，可以获得额外的好处，即回收有价值的物质（例如金属氢氧化物或盐溶液）。酸洗溶液的连续处理和再生可通过将扩散渗析（DD）和膜蒸馏（MD）技术与反应性沉淀装置相结合来实现，在那里可以将铁离子从富锌溶液中分离出来，以回收有价值的产品。为此，开发了稳态过程模拟器来预测所建议的集成过程的运行。 （C）2019 Elsevier Ltd.保留所有权利。

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