articleEnvironmental Technology & InnovationDec 14, 2023GOLD OA

Corrosion effect of acid/alkali on cementitious red mud-fly ash materials containing heavy metal residues

BBBing BaiJCJing ChenFBFan BaiQNQingke NieXJXiangxin Jia

Beijing Jiaotong University

Indexed incrossrefdoaj

Abstract

High-strength cementitious red mud-fly ash materials (RFMs) were formed from sodium hydroxide and water glass mixed solutions, and their abilities to solidify heavy metal ions (HMs, e.g., copper and cadmium) were assessed. The mechanism for precipitation of the HMs by corrosive acid/alkali solutions was explored via toxicity leaching tests, as well as SEM, XRD, FT-IR and XPS. The results showed that when the added alkaline activator was not fully consumed, the presence of small amounts of HMs consumed the excess alkaline ions to form hydroxide precipitates that filled the pores of the RFM, so the compressive strength of the RFM increased. Otherwise, the presence of excess HMs reduced the compactness of the RFM…

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311
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Authors

5

Topics & keywords

Topics
Keywords
  • Fly ash
  • Cementitious
  • Alkali metal
  • Corrosion
  • Red mud
  • Heavy metals
  • Metal
  • Materials science
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