Abstract
Discussion Forum (0)
Rare earth elements (REEs) may be produced from secondary waste sources such as: uranium tailings, red mud, coal by-products, wastes from phosphate fertilizer production, and mineral by-products. This presentation reports on research designed to develop a process flowsheet for REE production from a Canadian fly ash, resulting in almost no residual waste. In the proposed flowsheet, atmospheric tank leaching with a short retention time with dilute sulphuric acid was used to solubilize a fraction of the Sc and REEs (20 to 50%); a two-step ion exchange (IX) process was used to selectively recover Sc in the first step, followed by the recovery of the other REEs in the second step; and finally the residual fly ash is used as a supplementary cementing material in concrete.
Rare earth elements (REEs) may be produced from secondary waste sources such as: uranium tailings, red mud, coal by-products, wastes from phosphate fertilizer production, and mineral by-products. This presentation reports on research designed to develop a process flowsheet for REE production from a Canadian fly ash, resulting in almost no residual waste. In the proposed flowsheet, atmospheric tank leaching with a short retention time with dilute sulphuric acid was used to solubilize a fraction of the Sc and REEs (20 to 50%); a two-step ion exchange (IX) process was used to selectively recover Sc in the first step, followed by the recovery of the other REEs in the second step; and finally the residual fly ash is used as a supplementary cementing material in concrete.
Developing a Process to Recover Rare Earth Elements and Scandium from Coal Fly Ash
Rory Cameron
Abstract
Discussion Forum (0)
Rare earth elements (REEs) may be produced from secondary waste sources such as: uranium tailings, red mud, coal by-products, wastes from phosphate fertilizer production, and mineral by-products. This presentation reports on research designed to develop a process flowsheet for REE production from a Canadian fly ash, resulting in almost no residual waste. In the proposed flowsheet, atmospheric tank leaching with a short retention time with dilute sulphuric acid was used to solubilize a fraction of the Sc and REEs (20 to 50%); a two-step ion exchange (IX) process was used to selectively recover Sc in the first step, followed by the recovery of the other REEs in the second step; and finally the residual fly ash is used as a supplementary cementing material in concrete.
Rare earth elements (REEs) may be produced from secondary waste sources such as: uranium tailings, red mud, coal by-products, wastes from phosphate fertilizer production, and mineral by-products. This presentation reports on research designed to develop a process flowsheet for REE production from a Canadian fly ash, resulting in almost no residual waste. In the proposed flowsheet, atmospheric tank leaching with a short retention time with dilute sulphuric acid was used to solubilize a fraction of the Sc and REEs (20 to 50%); a two-step ion exchange (IX) process was used to selectively recover Sc in the first step, followed by the recovery of the other REEs in the second step; and finally the residual fly ash is used as a supplementary cementing material in concrete.
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