Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings

Felix Ndubisi Okonta, Thabo Falayi, Freeman Ntuli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Acidic gold mine tailings were alkaline activated using KOH. The effect of potassium aluminate (KA) on the strength and durability of the geopolymers was investigated. A 2.8 KA:KOH geopolymer had a UCS of 18.10 MPa after curing for 5 days at 100 °C. There was an increase in UCS with an increase in loading of KA up to a ratio of 2.8. Beyond the KA:KOH ratio of 2.8, there was a 48% drop in UCS due to excess K+ ions in the system which resulted in the loss of charge balance of the system leading to reduction of UCS. It is worth mentioning that the KA:KOH ratio of 2.8 represented a Si/Al ratio of 1.02. This study showed that KA activation of acidic gold mine tailings is an attractive route to stabilise/solidify hazardous tailing material. Though there is use of elevated temperature to achieve high strength for the KA based geopolymer, this pales in comparison to energy requirements of cement manufacturing and clay brick firing.
Original languageEnglish
Title of host publicationGeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures
Subtitle of host publicationSustainable Civil Infrastructures
EditorsH. Khabbaz, H. Youn, M. Bouassida
PublisherSpringer International Publishing
Pages270-275
Number of pages6
ISBN (Electronic)978-3-319-95771-5
ISBN (Print)978-3-319-95770-8
DOIs
Publication statusPublished - 2018

Fingerprint

gold mine
tailings
potassium
durability
cement
manufacturing
clay
ion
energy
temperature

Cite this

Okonta, F. N., Falayi, T., & Ntuli, F. (2018). Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings. In H. Khabbaz, H. Youn, & M. Bouassida (Eds.), GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures: Sustainable Civil Infrastructures (pp. 270-275). Springer International Publishing. https://doi.org/10.1007/978-3-319-95771-5_21
Okonta, Felix Ndubisi ; Falayi, Thabo ; Ntuli, Freeman. / Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings. GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures: Sustainable Civil Infrastructures. editor / H. Khabbaz ; H. Youn ; M. Bouassida. Springer International Publishing, 2018. pp. 270-275
@inproceedings{d5e40e27ff2a4958967f4742dd255087,
title = "Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings",
abstract = "Acidic gold mine tailings were alkaline activated using KOH. The effect of potassium aluminate (KA) on the strength and durability of the geopolymers was investigated. A 2.8 KA:KOH geopolymer had a UCS of 18.10 MPa after curing for 5 days at 100 °C. There was an increase in UCS with an increase in loading of KA up to a ratio of 2.8. Beyond the KA:KOH ratio of 2.8, there was a 48{\%} drop in UCS due to excess K+ ions in the system which resulted in the loss of charge balance of the system leading to reduction of UCS. It is worth mentioning that the KA:KOH ratio of 2.8 represented a Si/Al ratio of 1.02. This study showed that KA activation of acidic gold mine tailings is an attractive route to stabilise/solidify hazardous tailing material. Though there is use of elevated temperature to achieve high strength for the KA based geopolymer, this pales in comparison to energy requirements of cement manufacturing and clay brick firing.",
author = "Okonta, {Felix Ndubisi} and Thabo Falayi and Freeman Ntuli",
year = "2018",
doi = "10.1007/978-3-319-95771-5_21",
language = "English",
isbn = "978-3-319-95770-8",
pages = "270--275",
editor = "H. Khabbaz and H. Youn and M. Bouassida",
booktitle = "GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures",
publisher = "Springer International Publishing",

}

Okonta, FN, Falayi, T & Ntuli, F 2018, Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings. in H Khabbaz, H Youn & M Bouassida (eds), GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures: Sustainable Civil Infrastructures. Springer International Publishing, pp. 270-275. https://doi.org/10.1007/978-3-319-95771-5_21

Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings. / Okonta, Felix Ndubisi; Falayi, Thabo; Ntuli, Freeman.

GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures: Sustainable Civil Infrastructures. ed. / H. Khabbaz; H. Youn; M. Bouassida. Springer International Publishing, 2018. p. 270-275.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings

AU - Okonta, Felix Ndubisi

AU - Falayi, Thabo

AU - Ntuli, Freeman

PY - 2018

Y1 - 2018

N2 - Acidic gold mine tailings were alkaline activated using KOH. The effect of potassium aluminate (KA) on the strength and durability of the geopolymers was investigated. A 2.8 KA:KOH geopolymer had a UCS of 18.10 MPa after curing for 5 days at 100 °C. There was an increase in UCS with an increase in loading of KA up to a ratio of 2.8. Beyond the KA:KOH ratio of 2.8, there was a 48% drop in UCS due to excess K+ ions in the system which resulted in the loss of charge balance of the system leading to reduction of UCS. It is worth mentioning that the KA:KOH ratio of 2.8 represented a Si/Al ratio of 1.02. This study showed that KA activation of acidic gold mine tailings is an attractive route to stabilise/solidify hazardous tailing material. Though there is use of elevated temperature to achieve high strength for the KA based geopolymer, this pales in comparison to energy requirements of cement manufacturing and clay brick firing.

AB - Acidic gold mine tailings were alkaline activated using KOH. The effect of potassium aluminate (KA) on the strength and durability of the geopolymers was investigated. A 2.8 KA:KOH geopolymer had a UCS of 18.10 MPa after curing for 5 days at 100 °C. There was an increase in UCS with an increase in loading of KA up to a ratio of 2.8. Beyond the KA:KOH ratio of 2.8, there was a 48% drop in UCS due to excess K+ ions in the system which resulted in the loss of charge balance of the system leading to reduction of UCS. It is worth mentioning that the KA:KOH ratio of 2.8 represented a Si/Al ratio of 1.02. This study showed that KA activation of acidic gold mine tailings is an attractive route to stabilise/solidify hazardous tailing material. Though there is use of elevated temperature to achieve high strength for the KA based geopolymer, this pales in comparison to energy requirements of cement manufacturing and clay brick firing.

U2 - 10.1007/978-3-319-95771-5_21

DO - 10.1007/978-3-319-95771-5_21

M3 - Conference contribution

SN - 978-3-319-95770-8

SP - 270

EP - 275

BT - GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures

A2 - Khabbaz, H.

A2 - Youn, H.

A2 - Bouassida, M.

PB - Springer International Publishing

ER -

Okonta FN, Falayi T, Ntuli F. Potassium Aluminate Geopolymerisation of Acidic Gold Mine Tailings. In Khabbaz H, Youn H, Bouassida M, editors, GeoChina 2018: New Prospects in Geotechnical Engineering Aspects of Civil Infrastructures: Sustainable Civil Infrastructures. Springer International Publishing. 2018. p. 270-275 https://doi.org/10.1007/978-3-319-95771-5_21