Application Of Nanofiltration For Rare Earth Elements Recovery From Coal Fly Ash Leachate: Performance And Cost Evaluation
| Autor: | Andrea Turolla, Borte Kose Mutlu, Heileen Hsu-Kim, Mark R. Wiesner, Manuela Antonelli, Beatrice Cantoni |
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| Rok vydání: | 2018 |
| Předmět: |
General Chemical Engineering
Microfiltration Rare earth Membrane technology Coal combustion products 02 engineering and technology 010501 environmental sciences 01 natural sciences Industrial and Manufacturing Engineering Coal combustion residues Response surface methodology Cost model Environmental Chemistry Chemical Engineering (all) Leachate 0105 earth and related environmental sciences Chemistry (all) Critical elements General Chemistry 021001 nanoscience & nanotechnology Pulp and paper industry Fly ash Environmental science Nanofiltration 0210 nano-technology |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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