system and method for recovery of scandium values from scandium

The extraction of scandium from an Australian red mud by selective acid leaching has been explored and the recovery of scandium from a synthetic leach solution using solvent extraction studied. Preliminary leaching tests showed that H 2 SO 4 performed best with highest scandium leaching efficiency amongst the three mineral …

A new step in the Bayer process has been used to recover NaOH and to reduce its content in red mud. After digestion, the residue is separated from the Bayer liquor and goes through press filters, which enables the recovery of NaOH and decreases the moisture content. It is well known that red mud is one of the most important sources of …

A discussion of factors affecting scandium extraction/recovery towards UN SDG. • A thorough review of current techniques for scandium extraction/recovery. • Analysis of each of the main scandium sources worldwide and opportunities. • Hydrometallurgical processing is the main route towards low CO 2 emission. •

Due to the limitation of scandium only existing in a few areas, researchers have been looking for new sources to extract scandium. 8 Scandium is also a rare element with an average abundance of only 0.22 × 10 −4 wt% in the earth's crust, resulting in a complex and pricey metallurgical process. 9 Ores with a scandium content range of …

At present, acidic wastewater is directly neutralized with lime or limestone, which wastes resources such as titanium, scandium, and iron and generates a great deal of solid waste. This study proposes a novel approach for the separation and recovery of titanium, scandium, and iron from acidic wastewater and red gypsum utilization. The …

Precipitation of insoluble scandium compounds from scandium-containing solutions is the easiest method to recover scandium. However, the co …

Scandium is very much a late starter compared to many of the other elements, due to its relatively low occurrence and the difficulty in obtaining it from its ores. For example, it wasn't until the 1960s when the first pound, or 450 grams, of high purity scandium was obtained. Compounds of scandium find use in organic chemistry.

Scandium recovery from red mud should be considered, because of its rarity and increasing market demand, as a primary goal rather than a secondary by-product in the design process of the entire flow-chart. One of the most popular approaches for scandium recovery from red mud applies hydrometallurgical processes, such as acid …

The recovery of scandium from Greek BR can be an excellent approach for waste management and resource efficiency of the waste using environmentally friendly biometallurgical methods.

Scandium could be recovered via a number of processes, including solvent extraction, ion exchange, liquid membrane extraction, etc. (Liao et al., 2001). Currently, hydrometallurgical processes, which mainly involve leaching, solvent extraction and precipitation have become the most commonly used methods for scandium recovery …

Therefore, scandium extraction is difficult and requires pretreatment. Opare et al. [2] outlined existing REE production and recycling routes. Zou et al. aimed at the progress of scandium extraction by solvent extraction method [26]. Wang et al. focuses on metallurgical processes for scandium recovery [27].

Scandium is one of the valuable elements in bauxite residues. It is possible to extract and enrich scandium from red mud by leaching and solvent extraction. Scandium can then be recovered from the pregnant strip liquor by crystallization. Different crystallization techniques can be used to generate the supersaturation required for …

A synergistic extraction system for Sc(III) with P204 and N1923 was studied. • The maximum synergistic coefficient was found to be 12.50. • The formation of hydrogen bond N H + ···O P was confirmed to enhance the scandium extraction.. A scandium separation flow sheet from the spent sulfuric acid solution of TiO2 production was …

Test results show scandium leaching recovery of 95.12% and the acid leaching residue with Sc2O3 content of 8.12 g/t are obtained, while the extraction of scandium is obvious.

The scandium in the filtrate after the recovery of titanium can be finely extracted with P507, and 99.79% scandium can be extracted by single-stage extraction under the P507 concentration of 15% ...

Sc recovery is now implemented in industrial production using a combination of hydrometallurgical and pyrometallurgical techniques, such as ore …

The scandium in the loaded organic phase is fully stripped in three stages using 1 M HCl at an O:A ratio of 1:1 for the TBP system and 2:1 for the P350 system. The scandium is recovered as ...

Beneficiation, hydrometallurgy, precipitation method, extraction method, and ion exchange method are the main process of …

The recovery of scandium (Sc) from wastes and various resources using solvent extraction (SX) was discussed in detail. Moreover, the metallurgical extractive procedures for Sc recovery were presented.

In this study, a scandium concentrate with Sc2O3 content of 66.24 g/t was obtained from V-Ti magnetite tailings by physical concentration, and the main Sc-bearing minerals were augite and hornblende. A novel process of roasting and leaching was proposed to extract scandium from scandium concentrate with titanium dioxide …

The recovery of scandium (Sc) from wastes and various resources using solvent extraction (SX) was discussed in detail. Moreover, the metallurgical extractive procedures for Sc recovery were presented. Acidic and neutral organophosphorus (OPCs) extractants are the most extensively used in industrial …

Understanding the challenges in scandium sour- cing, recovery and purification processes, and alloying methods, a vertically integrated solution has been devel- oped …

We retrieved the literature records in Web of science with the keywords "scandium", "separation" and "extraction", and performed the data analysis of the relevant articles (Fig. 1).The annual published articles increased from 1967 to 2022 (Fig. 1 (c)).In the keyword word frequency heat map (Fig. 1 (a)) and its co-occurrence relationship …

Wang et al. [56] conducted an experiment on the recovery of scandium from a synthetic leach solution of an Australian red mud by using solvent extraction. The syn-thetic red mud leach solution-enriched 5.53 mg L-1scan-dium was prepared by 1 mol L-1H2SO4 at L/S ratio of 10, temperature of 50 C and leaching for 2 h.

The present review considers scandium extraction from three different sources - primary, secondary and opportunities – focusing on clean technologies and …

Furthermore, the reaction parameters and methods used in SX for Sc recovery are extensively investigated by Wang and Cheng, 2011, Das et al., 2018. Back stripping of Sc from the organic solvents with high concentrations of strong inorganic acids such as HCl, HNO 3 and H 2 SO 4 is reported to be problematic (Ditze and Kongolo, …

A scandium production with 96% purity and 95% recovery was achieved using 6–8 stages of SX, 7–9 stages of scrubbing, and 1–2 stages of recovery. …

•. A discussion of factors affecting scandium extraction/recovery towards UN SDG. •. A thorough review of current techniques for scandium extraction/recovery. •. …

earth metals is increasing. Scandium, which is often considered a rare earth element (REE), is a. critical metal mainly used in solid oxide fuel cells (SOFCs) and high strength aluminum alloys ...

• Specifically employs ion-exchange technologies, pre or post copper recovery. HIGHLIGHTS – "Scandium Master Alloy Production." • Patent Number 10,988,830, granted April 27, 2021. • Defines methods for manufacturing aluminum-scandium master alloy (2%). • Identifies a two-flux system, containing a fluoride and an alkali metal chloride.

The recovery of scandium and titanium were mostly examined by direct acid leaching route 21,22,23,24,25. Reid et al . reported the extraction of Sc from red mud via microwave heat treatment ...

Specifically employs ion-exchange technologies, pre or post copper recovery. HIGHLIGHTS – "Scandium Master Alloy Production." Patent Number 10,988,830, granted April 27, 2021. Defines methods for manufacturing aluminum-scandium master alloy (2%). Identifies a two-flux system, containing a fluoride and an …

The scandium in the filtrate after the recovery of titanium can be finely extracted with P507, and 99.79% scandium can be extracted by single-stage extraction under the P507 concentration of 15% ...

In order to decrease the stripping acidity of scandium as well as improve the extraction efficiency of Cyanex923 for scandium in lower acidity solution, the synergistic effect of scandium from sulfuric acid solutions using mixed Cyanex 272 and Cyanex923 is proposed and systematically studied in this paper.