Özet
This work evaluated nanofiltration (NF) as a potential step in the recovery process of Rare Earth Elements (REEs) from leachates of coal combustion fly ashes. A pre-treatment step, by pH adjustment and microfiltration (MF), has been studied to separate REEs by major elements. The individual and combined effects of applied pressure (12-24 bar) and NF feed acidity (pH 1.5-3.5) on rejection of six critical REEs and permeate flux have been investigated via response surface methodology (RSM). The resulting model equations were used to develop a cost model for the recovery chain, in order to select the optimum NF operating conditions. The optimization of the REE recovery chain, including pre-treatment and NF, was done with respect to the objective of maximizing the difference between NF concentrate economic value and treatment cost. NF with an appropriate MF pre-treatment has been effective in concentrating REEs from fly ash leachate, reaching the maximum potential gain at the optimum operating conditions of 12 bar and pH 3.5.
Orijinal dil | İngilizce |
---|---|
Sayfa (başlangıç-bitiş) | 309-317 |
Sayfa sayısı | 9 |
Dergi | Chemical Engineering Journal |
Hacim | 349 |
DOI'lar | |
Yayın durumu | Yayınlandı - 1 Eki 2018 |
Harici olarak yayınlandı | Evet |
Bibliyografik not
Publisher Copyright:© 2018 Elsevier B.V.
Finansman
The research was supported by the U.S. Department of Energy under the Project No. DE-FE0026952 and the U.S. National Science Foundation Environmental Engineering program (CBET-1510965). The financial support for Dr. Borte Kose-Mutlu was provided by TUBITAK 2219-International Postdoctoral Research Fellowship Program. The authors thank Ross Taggart for providing coal fly ash leachate, Prof. Dr. Dincer Topacık National Research Center on Membrane Technologies (MEM-TEK) for ZP measurements, and David Dickerson for supplying NP010 and NP030 membranes.
Finansörler | Finansör numarası |
---|---|
National Science Foundation Environmental Engineering Program | CBET-1510965 |
TUBITAK | |
U.S. Department of Energy | DE-FE0026952 |