Innovative Technology for Secondary Fly Ash Full Resource Utilization: Industrial Testing and Life Cycle Assessment Research

IF 7.3 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Sustainable Chemistry & Engineering Pub Date : 2024-11-26 DOI:10.1021/acssuschemeng.4c06858

Yanfei Lin, Guoxia Wei, Hanqiao Liu, Zilu Liu, Qi Li

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Abstract

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

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二次粉煤灰充分利用的创新技术：工业测试和生命周期评估研究

焚烧飞灰（IFA）烧结技术的应用带来了大量富含重金属和氯化物的二次飞灰（SFA），其处理问题备受关注。为了实现 SFA 的完全资源化利用，最近开发出了一种独特的三步处理技术，包括酸洗、重金属沉淀和氯化物蒸发。工业试验结果表明，在酸洗步骤中，最佳液/固（L/S）比和 Ca（OH）2 加入量分别为 2:1 和 30%。在重金属沉淀步骤中，使用 pH 值为 10 的固体 NaOH 沉淀剂去除重金属效果最佳。在氯化物蒸发过程中，每吨滤液平均消耗的蒸汽和电力分别为 0.4 吨和 16.5 kw-h。此外，还根据工业试验结果，通过生命周期评估（LCA）方法分别评估了三个步骤对环境的影响。结果表明，酸洗阶段对整个工艺的环境影响最大。最后，考虑到 IFA 烧结陶瓷厂有大量可用的脱酸废液和余热烟气，利用生命周期评估和生命周期成本法分析了通过技术创新提高整个工艺的环境和经济性能的潜力。生命周期评估结果表明，采用两个创新装置的优化方案在环境可持续性方面表现更佳，与普通方案相比，全球变暖影响降低了 29.5%。生命周期成本法结果表明，优化方案的生命周期成本值为-8.15美元/吨，比普通方案的4.27美元/吨更具经济效益。

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来源期刊

ACS Sustainable Chemistry & Engineering CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.80

自引率

4.80%

发文量

1470

审稿时长

1.7 months

期刊介绍： ACS Sustainable Chemistry & Engineering is a prestigious weekly peer-reviewed scientific journal published by the American Chemical Society. Dedicated to advancing the principles of green chemistry and green engineering, it covers a wide array of research topics including green chemistry, green engineering, biomass, alternative energy, and life cycle assessment. The journal welcomes submissions in various formats, including Letters, Articles, Features, and Perspectives (Reviews), that address the challenges of sustainability in the chemical enterprise and contribute to the advancement of sustainable practices. Join us in shaping the future of sustainable chemistry and engineering.