Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Ofer-Rozovsky, Ela; Bar-Nes, Gabriela; Katz, Amnon; Haddad, Michal Arbel

doi:10.1007/s12649-021-01584-x

Cited by 6 publications

(2 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It could be concluded that the copper mine tailing is a promising precursor for obtaining building products based on the geopolymerization process. Additionally, due to the encapsulation of heavy metals and other environmentally contaminants in the geopolymer matrix, the mobility of hazardous compounds could be expected to be lower in the final geopolymer product [40].…”

Section: Discussionmentioning

confidence: 99%

“…The ratio between Si/Al was calculated to be equal to 3. Moreover, the studied copper mine tailing contained a relatively low quantity of SO 3 (3%), which was found to enhance the stability of the obtained geopolymer products [38][39][40]. Besides the Si and Al bearing minerals, elements such as Fe, Mg and Ca, can react and participate in the geopolymer matrix by forming other solid phases, which can affect the final properties of the structure [41].…”

Section: Physicochemical Characteristics: Ph Ec and Ehmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Bulgarian Copper Mine Tailing as a Precursor for Obtaining Geopolymers

Ilieva,

Angelova,

Radoykova

et al. 2024

Materials

View full text Add to dashboard Cite

Valorization of high-volume mine tailings could be achieved by the development of new geopolymers with a low CO2 footprint. Materials rich in aluminum and silicon with appropriate solubility in an alkaline medium can be used to obtain a geopolymer. This paper presents a study of copper mine tailings from Bulgaria as precursors for geopolymers. Particle size distribution, chemical and mineralogical composition, as well as alkaline reactivity, acidity and electroconductivity of aqueous slurry are studied. The heavy metal content and their mobility are studied by leaching tests. Sequential extraction was applied to determine the geochemical phase distribution of heavy metals. The studied samples were characterized by high alkalinity, which could favor the geopolymerization process. The water-soluble sulphates were less than 4%. The Si/Al ratio in mine tailing was found to be 3. The alkaline reactivity depended more so on the time of extraction than on the concentration of NaOH solution. The main part of the heavy metals was found in the residual fraction; hence, in high alkaline medium during the geopolymerization process, they will stay fixed. Thus, the obtained geopolymers could be expected to exert low environmental impact. The presented results revealed that studied copper mine tailing is a suitable precursor for geopolymerization.

show abstract

Section: Discussionmentioning

confidence: 99%