Browsing by UP Author "Castleman, Barbara A."

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Ammonium sulphate and/or ammonium bisulphate as extracting agents for the recovery of aluminium from ultrafine coal fly ash

Van der Merwe, E.M. (Elizabet Margaretha); Gray, Clarissa L.; Castleman, Barbara A.; Mohamed, Sameera; Kruger, Richard A.; Doucet, Frédéric J. (Elsevier, 2017-08)

We recently showed that the selective extraction of aluminium from the amorphous phase of a South African ultrafine coal fly ash can be achieved via thermochemical treatment with ammonium sulphate for 1 h followed by aqueous ...
Thermochemical processing of a South African ultrafine coal fly ash using ammonium sulphate as extracting agent for aluminium extraction

Doucet, Frédéric J.; Mohamed, Sameera; Neyt, Nicole Candice; Castleman, Barbara A.; Van der Merwe, E.M. (Elizabet Margaretha) (Elsevier Science Limited, 2016-12)

South African coal fly ash represents an untapped secondary resource of aluminium. Continuous research is conducted to develop suitable chemical and/or geometallurgical processes for aluminium extraction, preferably ...
Thermochemical purification of talc with ammonium sulphate as chemical additive

Castleman, Barbara A.; Van der Merwe, E.M. (Elizabet Margaretha); Doucet, Frederic J. (Elsevier, 2021-04)

This study reports on the thermochemical reactivity of talc with ammonium sulphate, a low-cost, recyclable chemical additive commonly used in the thermochemical extraction of strategic metals from low-grade ores and ...

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