Scandium Recovery from Uranium Solutions

Lash, L. D.; Ross, J.R.H.

doi:10.1007/bf03378097

Cited by 10 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3] and is rarely concentrated in ores due to its low affinity for combining with common ore-forming anions. This makes it challenging to recover scandium by mining although a few scandiumbearing ores have been exploited mainly in China 4,5 and a new project is currently underway in the USA. 6 For this reason, it becomes more attractive to recover scandium from waste streams of other mining and metallurgical industries such as the bauxite residue from the alumina industry amongst others.…”

Section: Introductionmentioning

confidence: 99%

Impact of process parameters on product size and morphology in hydrometallurgical antisolvent crystallization

2022

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Impact of process parameters on product size and morphology in hydrometallurgical antisolvent crystallization

2022

View full text Add to dashboard Cite

show abstract

“…For example, porous silica adsorbents were used to enrich Sc from an REE-bearing leachate solution, which was pretreated with two cycles of precipitation and redissolution to remove the majority of non-REEs . In addition, some adsorbents modified with chelating ligands, such as ethylene glycol-bis(β-aminoethyl ether)- N , N , N ′, N ′-tetraacetic acid (EGTA) and ionic liquids, require a pH gradient elution to separate Sc from other ions. , Nevertheless, all SLE processes for Sc extraction will need additional downstream procedures such as precipitation and filtration (Figure S13) , to further remove the impurities (e.g., Th and U) and produce a Sc 2 O 3 product . In a traditional downstream purification process, for example, the Sc concentrate along with impurities (Th, U, Fe, and Si) could be precipitated by NaOH and filtered to recycle the citrate.…”

Section: Resultsmentioning

confidence: 99%

Microbe-Encapsulated Silica Gel Biosorbents for Selective Extraction of Scandium from Coal Byproducts

Dong

Deblonde

Middleton

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

Scandium (Sc) has great potential for use in aerospace and clean energy applications, but its supply is currently limited by a lack of commercially viable deposits and the environmental burden of its production. In this work, a biosorption-based flow-through process was developed for extraction of Sc from low-grade feedstocks. A microbe-encapsulated silica gel (MESG) biosorbent was synthesized through sol–gel encapsulation of Arthrobacter nicotianae, a bacterium that selectively adsorbs Sc. Microscopic imaging revealed a high cell loading and macroporous structure, which enabled rapid mass transport and adsorption/desorption of metal ions. The biosorbent displayed high Sc selectivity against lanthanides and major base metals, with the exception of Fe(III). Following pH adjustment to remove Fe(III) from an acid leachate prepared from lignite coal, a packed-bed column loaded with the MESG biosorbent exhibited near-complete Sc separation from lanthanides; the column eluate had a Sc enrichment factor of 10.9, with Sc constituting 96.4% of the total rare earth elements. The MESG biosorbent exhibited no significant degradation with regard to both adsorption capacity and physical structure after 10 adsorption/desorption cycles. Overall, our results suggest that the MESG biosorbent offers an effective and green alternative to conventional liquid–liquid extraction for Sc recovery.

show abstract

“…Scandium (Sc), which is used as a tuning metal in Al-Sc alloys to enhance their strength 1,2 , weldability 3 , heat and corrosion resistance 4 as well as in solid oxide fuel cells (SOFCs) to achieve extreme oxygen-ion conductivity, is the focus of great interest 5,6 . However, due to the geographical scarcity of primary resources and complex extraction and purification routes of secondary resources 7 such as uranium 8 , titanium pigment 9 and nickel laterite processing 10,11 , Sc in metallic form is extremely expensive 12 . The current global Sc production is approximately 15 tonnes 13 ; however, the demand is foreseen to upsurge as a result of the technological developments, especially in the energy field (i.e.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Scandium Phosphate after Peroxide Assisted Leaching of Iron Depleted Bauxite Residue (Red Mud) Slags

Yagmurlu

Alkan

Xakalashe

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Anticipated future demand and limited primary sources of Sc highlight the importance of secondary Sc resources such as bauxite residue (red mud). In this study, a process route starting from red mud aiming to recover Sc as a concentrate by a combination of pyrometallurgical and hydrometallurgical processes was developed. Bauxite residue was treated in an electric arc furnace (EAF) for Fe removal as well as slag conditioning with varying flux additions and various cooling conditions. 95% of iron recovery to the metal was achieved. Resulting slags were subjected to identical H 2 O 2 supported H 2 SO 4 leaching conditions at 75 °C. The effect of slag mineralogy and crystallinity on the leaching efficiencies were investigated using XRD and QEMSCAN analysis. As a result of the highly amorphous nature of acidic slags, maximum of 72% Sc leaching was obtained. For leached slags, water quenched basic slag was found to be the most promising condition resulting in an extreme Sc leaching yield of 97% and this slag was selected for the further Sc precipitation. High impurity removal rates and selective Sc separation were achieved with a triple-stage successive precipitation to synthesize a Sc concentrate. Starting from EAF treatment followed by leaching and precipitation, 85% of the initial Sc in the red mud was successfully recovered as Sc phosphate.

show abstract

Scandium Recovery from Uranium Solutions

Cited by 10 publications

References 1 publication

Impact of process parameters on product size and morphology in hydrometallurgical antisolvent crystallization

Impact of process parameters on product size and morphology in hydrometallurgical antisolvent crystallization

Microbe-Encapsulated Silica Gel Biosorbents for Selective Extraction of Scandium from Coal Byproducts

Synthesis of Scandium Phosphate after Peroxide Assisted Leaching of Iron Depleted Bauxite Residue (Red Mud) Slags

Contact Info

Product

Resources

About