ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 26, 2024

The application of incineration fly ash (IFA) sintering technology has brought a large amount secondary (SFA) rich in heavy metals and chlorides, its treatment attracted much attention. A unique three-step involving acid washing, metal precipitation, chloride evaporation recently been developed to achieve complete resource utilization SFA. industrial test results showed that the optimum liquid/solid (L/S) ratio Ca(OH)2 added were 2:1 30%, respectively, washing step. In precipitation step, use solid NaOH precipitant at pH 10 was optimal for removal metals. For evaporation, average consumption steam electricity each tonne filtrate 0.4 t 16.5 kw·h, respectively. Furthermore, environmental impact three steps evaluated separately through life cycle assessment (LCA) method based on results. indicated stage had greatest whole process. Finally, considering IFA ceramics plant available deacidification waste solution heat flue gas, potential improving economic performance overall process technological innovation analyzed using LCA costing (LCC) method. optimization scenario with two innovative units performed better terms sustainability, decreasing global warming by 29.5% compared normal scenario. LCC demonstrated an value −8.15 USD/t more economically efficient than 4.27 USD/t.

Язык: Английский