Techno-economic analysis of geopolymer production from the coal fly ash with high iron oxide and calcium oxide contents

JOURNAL OF HAZARDOUS MATERIALS

卷:361

Article

You, Siming¹  Ho, Siew Wah²  Li, Tingting²  Maneerung, Thawatchai³  Wang, Chi-Hwa² 

[1] Univ Glasgow, Sch Engn, Div Syst Power & Energy, Glasgow G12 8QQ, Lanark, Scotland

[2] Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr 4, Singapore 117585, Singapore

[3] Natl Univ Singapore, NUS Environm Res Inst, 1 Create Way,Create Tower 15-02, Singapore 138602, Singapore

关键词: Geopolymer;    Coal fly ash;    Ordinary Portland cement;    Circular economy;    Cost-benefit analysis;   

DOI  :  10.1016/j.jhazmat.2018.08.089

来源: Elsevier

【 摘 要 】

In this work, we firstly examined the technical feasibility of geopolymer synthesis from the coal fly ash with high iron oxide (48.84 wt.%) and calcium oxide (22.15 wt.%) contents. The heat resistance of geopolymer was represented by the dry weight loss which ranged from 2.5 to 4.9% and was better than that (11.7%) of OPC. However, the high iron oxide content made the acid resistance (13-14%) of geopolymer inferior to OPC. The economics of geopolymer production changes significantly upon the variation in the arrangement of material use and geopolymer price. The costs of Na2SiO3 and NaOH and the benefit of geopolymer selling were the major factors affecting the economic feasibility of geopolymer production. When the Na2SiO(3) price was around 400 USD/ton, the geopolymer production will be profitable even if the geopolymer price was as low as 50 USD/ton. It is possible to improve the economics of geopolymer production by varying the arrangement of material use while not impairing the performance of geopolymer.

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