قائمة الطعام
There is a method of extracting scandium from red mud, consisting in multiple sequential leaching of red mud with carbonate solution containing a mixture of 85-100 g / dm 3 NaHCO 3 and 20.0-45.0 g / dm 3 Na 2 CO 3 or 125 g / dm 3 NaHCO 3, when passing a gas-air mixture containing CO 2 through a pulp at a pressure of 3.0-6.0 MPa in vibro ...
Solvent extraction is commonly used for recovery of scandium from the laterite leach solutions. A number of chemicals are available for solvent extraction of …
The criticality of Sc and REEs, future market potential and low recycling rates highlights the need to search for and invest in recycling technologies in addition to new sources and more efficient primary extraction and refining methods. The main scandium resources worldwide are in Australia, Canada, China, Kazakhstan, Madagascar, Norway, …
In order to separate and recover scandium from acidic wastewater, methods such as solvent extraction, ion exchange, adsorption, and precipitation have been studied by a large number of researchers [22,23,24,25,26], of which solvent extraction, with a high extraction efficiency and good selectivity, is widely used in the …
employed to extract Sc3+ from the leaching solution of Fe3+ free. With the. organic phase containing 5 vol% EHP AEH, phase volume ratio O/A of 1:5, at pH 0.3, nearly 99% scandium is extracted ...
The most effective methods for Sc extraction are RM leaching by dilute inorganic acids [26][27] ... Despite the studies in the literature about scandium extraction from bauxite residue, there is a ...
In terms of price, scandium is the most valuable rare-earth element in bauxite residue. This research discusses the effectiveness of scandium extraction from the bauxite residue through pressure leaching in sulfuric acid solution. The method was selected to obtain high scandium recovery and leaching selectivity to iron and aluminium.
The experimental result and statistical analysis revealed that the optimum condition for scandium extraction was at 1.5 M H2SO4, a leaching duration of 1 h, a temperature of 200 °C, and a slurry ...
The method selected for the extraction of scandium from UGS spent acid is using ion exchange resins, as described in . The specific method has the advantage of removing scandium and few other minor impurities from the spent acid, without affecting the concentration of chloride salts such as FeCl 2, MgCl 2, and AlCl 3, which are …
Scandium is one of the most important and strategic metals that can be recovered as a byproduct from lateritic nickel-cobalt ores. In this research, different extractants were investigated to extract scandium from sulphate medium …
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].
Sc recovery is now implemented in industrial production using a combination of hydrometallurgical and pyrometallurgical techniques, such as ore pre-treatment, …
SCANDIUM EXTRACTION METHOD TECHNICAL FIELD The present invention relates to a scandium extraction method and, in detail, relates to a method of efficiently separating and extracting scandium from an acidic solution containing calcium, magnesium and scandium. BACKGROUND ART Scandium, which has the smallest atomic number …
A method for extracting scandium values from scandium-containing ores is provided. The method comprises (a) providing ( 203 ) an ore which contains scandium; (b) treating ( 205 ) the ore with an acid; (c) baking the ore; and (d) leaching ( …
For scandium extraction from C272, a recovery r ate between 90% and 99% was achieved when 300–400 g/L sulfuric acid was used, while the correspondin g from P204 and Ionquest 801 wa s more difficult.
With such a combined method using ion exchange and solvent extraction, scandium can also be recovered from nitrate medium (Ochsenkuhn-Petropoulou et al., 2002). Obviously, such treatment of red mud is not economical due to the low content of scandium and the large amounts of impurities in the red mud.
The authors investigated the extraction of scandium using C923 as a test method. Scandium was recovered with a high efficiency, while Ti, Fe, and Zr were …
Scandium(III) extractions are interfered with by commonly associated elements such as iron(III), zirconium(IV), titanium(IV), thorium(IV), yttrium(III) and lanthanides(III). The advantages and disadvantages of applications of ion exchange and liquid membrane technologies for scandium recovery are reviewed and compared with …
important to select the appropriate beneciation method for the subsequent extraction of scandium. Extracting scandium from scandium concentrate depends on liquid mainly. Sul-furic acid, hydrouoric acid, nitric acid, and hydrochloric acid can be used as the main leaching agents. The purity of scandium is closely related to the Sc leaching rate ...
After obtaining the scandium enriched precipitate, the sulphuric acid leaching experiments showed that 98% of scandium can be extracted into the leach solution and it can further be recovered by solvent extraction or ion exchange method.
In this paper, the separation and purification methods of scandium using acidic, basic, neutral, and chelating extractants as well as synergetic solvent extraction procedures were discussed. Furthermore, the metallurgical procedures for scandium …
The method of extracting scandium is three-step sulphuric acid leaching of scandium, wherein at the first step, leaching is carried out with recycled solution after extraction of scandium at temperature of 30-50°C and solid to liquid ratio of 1:6-7 for 3-4 hours; the pulp is then divided into a solid phase and a liquid phase; at the second ...
Scandium concentrate and titanium dioxide wastewater (TDWW) all belong to waste, especially TDWW belongs to hazardous waste, it is urgent to find a more efficient and safer treatment method to deal with them, and both waste acid and waste ore contain scandium. The use of waste acid as a leaching agent can achieve the synergistic …
Results indicate that extraction ratio of scandium can reach 99.15% when calcium chloride ratio is 60%, calcining temperature and time is 950℃ and 1.5h respectively. ©, 2014, Editorial Office ...
Several methods of separating and extracting Scandium are introduced here, mainly including solvent extraction, ion exchange and adsorption. The common …
Currently, the methods combined with hydro- and pyro-metallurgical processes, including ore pre-treatment, leaching, solvent extraction, precipitation and …
A thorough review of current techniques for scandium extraction/recovery. •. Analysis of each of the main scandium sources worldwide and opportunities. •. …
The scandium in the ltrate after the recovery of titanium can be nely extracted with P507, and 99.79% scandium can be extracted by single-stage extraction under the P507 concentration of 15%, the phase ratio (O/A) of 1:13, and extraction time of 6 min. In addition, the process of extracting scandium with P507 is an exother-
A novel process of roasting and leaching was proposed to extract scandium from scandium concentrate with titanium dioxide wastewater. Scandium concentrate …
A method of extracting scandium from a scandium-containing titanium ore by chlorination roasting-leaching was reported by Xiao et al. 21 The leaching efficiency of 83.39%–83.47% was reported under the comprehensive conditions of sodium chloride dosage 4 wt%, roasting temperature 900 °C, roasting time 90 min, leaching liquid–solid …
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