experimental study on extraction of scandium from complex patent us5049363

The extraction of Sc by acid leaching with CaF 2 and solvent extraction with P507 from red mud was proposed. The influence of acid leaching and solvent extraction on recovery of Sc was investigated. The CaF 2 can obviously improve the leaching efficiency of Sc and reduce the acid consumption. The leaching efficiency of Sc …

Kinetic study of scandium extraction by TVEX from hydrochloric solutions with different acidity shows (Fig. 1 Fig. 2) that 90% of equilibrium Sc extraction is achieved in 120 min both for TVEX–DIOMP and TVEX–TBP.Values of the scandium diffusion coefficient in TVEX grains are given in Table 1.Aqueous phase acidity negligibly …

Solvent extraction of scandium from acidic solutions is most commonly performed with traditional acidic or neutral organophosphorus extractants in organic diluents, although carboxylic acids and ...

About 95 % of scandium is separated from the complex feedstock prepared from industrial waste bauxite residue, and the selectivity of scandium is more than 200 times higher than that of aluminum. Adsorption isotherm and kinetic studies are performed, and the experimental data are in good agreement with the Langmuir isotherm model …

The scandium concentrate used in the leaching experiment was obtained from the rare earth ore containing scandium in Yunnan Province, the sample used in experiment is leaching liquid containing ...

In this study, three methods were used and compared for the selectable extraction of aluminum/ scandium with the least amount of iron in red mud (RM) samples from the Iran alumina plant in Jajarm ...

In this study, solvent extraction of scandium with the mixed extractant of Versatic Acid 10 and TBP was investigated. Stripping experiments of Sc3+ were also carried out by using sulfuric acid.

In this study, a two-stage innovative process was developed with an aim to extract scandium from a laterite ore. The first stage involves carbothermic reduction in which the iron is reduced at 1400–1600 °C and separated as a metallic phase, while scandium is enriched in a slag phase. In the second stage of the process, a two-step …

Recently, efforts have been made to develop the extraction, recovery, and analysis of rare earth elements, especially the scandium Sc (III). This study describes the use of 15-crown-5, 12-crown-4, cryptand 2.2.2, and DC18-crown-6 as novel extractants using molecular recognition technology to effectively and selectively separate and …

Scandium is primarily deported in dolomite, with lesser quantities in pyrochlore and biotite. The process flowsheet recovers separate niobium, titanium, and scandium products. Scandium is extracted from whole ore hydrochloric acid leach solutions using solvent extraction and is further refined through a re-leach and …

Highlights. •. A review of scandium extraction by hydrometallurgical route is presented. •. A discussion of factors affecting scandium extraction/recovery towards …

The scandium concentrate used in the leaching experiment was obtained from the rare earth ore containing scandium in Yunnan Province, the sample used in experiment is leaching liquid containing scandium which the content of scandium is 3.6g/t, with complex impurity composition. The main influencing factors of extraction in hydrochloric …

The main conclusions derived from the results obtained in this study on the extraction of scandium from scandium concentrate with titanium dioxide wastewater are as follows: (1) The present study reinforced that solid waste (Sc concentrate) and hazardous waste acid (titanium dioxide wastewater) can be recovered by a more efficient …

Since 2015, JX Nippon Mining & Metals has been developing a process for scandium recovery from the residue of a titanium -smelting process. The process consists of the following steps: scandium concentrating by classification or neutralization, selective scandium leaching, impurity removal by neutralization, solvent extraction of scandium …

This review demonstrates many outstanding research achievements have been reported in recent years that solvent extraction technology occupies a dominant …

Iron(III) showed an extraction behavior similar to that of scandium(III). Scandium recovery was examined from a multielement rare-earth solution. Scandium could be separated from the other rare-earth elements by extraction with [Hbet][Tf 2 N] and subsequent scrubbing of the loaded ionic liquid phase to remove coextracted metal ions. …

Scandium extraction from its main minerals is di cult due to its rarity, as well as its low concentration in natural deposits (1–800 mg/kg), in addition to the presence of radioactive elements ...

Separation and purification of scandium by solvent extraction and related technologies: a review - Wang - 2011 - Journal of Chemical Technology & Biotechnology …

By further processing this scandium-enriched residue by means of leaching, SX (solvent extraction), and precipitation, an intermediate (NH 4) 2 NaScF 6 product can be obtained. View Show abstract

Scandium Solvent Extraction. January 2019. DOI: 10.1007/978-3-030-05864-7_174. In book: Light Metals 2019 (pp.1395-1401) Authors: Nigel Jeffrie Ricketts. Altrius Engineering Services. To read the ...

1. Introduction. With the rapid development of science and technology, scandium (Sc) and its compounds have been widely used in various fields such as in new materials, Al Sc alloys, electronics, metal halide lamps, aerospace, transportation industries, catalyst ceramics, and solid oxide fuel cells (Wang et al., 2011).Scandium is a rare …

This study aims to optimize the extraction efficiency of Sc(III) by dicyclohexano-18-crown-6 (DC18C6) and kryptofix 2.2.2 (K 2.2.2) macrocyclic compounds as novel extractants using response surface methodology (RSM). Additionally, it was intended to design a method for recovering Sc from an aqueous model solution using …

Abstract. Scandium is one of the most valuable rare-earth elements, and its extraction is centralized in China. For this reason, the search for new scandium …

Scandium is a rare-earth element. Although it is as abundant in the Earth's crust as lead, it is rarely concentrated. Therefore, it is obtained as a byproduct when mining other metals or from scrap processing of end-of-life products.1,2,3,4,5,6 Scandium is usually recovered using hydrometallurgical processes that include leaching, precipitation, …

It is important to understand that at low pH values, in strong sulfate solutions, the scandium will be present as a scandium sulfate complex ion. When stripped from the organic phase with chloride-based solutions, the scandium strips as a complex chloride ion. It is therefore important to keep the chloride ion activity high in the strip solution.

of a synergetic complex with two extractants at high acidity of the aqueous phase [4]. ... The purpose of this work was to study the extraction of scandium from sulfuric acid solutions ... 1 to 1 : 5. In some experiments, the extraction was carried out at a temperature of 25 ± 0.1°C in thermo-stated funnels. The phase contact time required to

A study involving P204 as an extractant and tributyl phosphate (TBP) as a modifier to recover scandium from HCl-leaching solutions of magnesium, aluminum, and …

The present study aimed at the scandium extraction from bauxite residue by H2SO4 and H3PO4 leaching. The use of H2O2 was evaluated to avoid silica gel formation. The effect of time, temperature ...

1. Introduction. Sc is classified as a rare earth element due to its similar properties with lanthanides. The abundance of Sc is not low, ranked the 31th in the earth, but the scarcity of independent Sc minerals and the similar properties of Sc with other elements (e.g., zirconium, thorium, titanium, etc.) makes the extraction and purification …

This study aims to optimize the extraction efficiency of Sc(III) by dicyclohexano-18-crown-6 (DC18C6) and kryptofix 2.2.2 (K 2.2.2) macrocyclic compounds as novel extractants using response ...

Scandium displayed similar trends to Fe, reinforcing the limited observations of the physicochemical similarities between these two elements in seawater. Overall, this study highlights distinct impacts of photochemical processes, scavenging, and biological effects on marine trace metal cycling in an environment characterized by seasonal …

In the present study, the kinetic study of the solid-liquid reaction (leaching) between two red mud types and the nitric acid solutions was carried out in order to extract scandium from the mud ...

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 ...

Scandium (Sc) is the lightest of REE. It has atomic number 21, thus being the neighbor of calcium (Ca). Unlike calcium, which is the fifth most abundant element in the Earth's crust, Scandium is scarce, but still more abundant than lead, tin, silver etc. Scandium has the electron configuration [Ar]3s 2 3d 1.This immediately indicates that …

Full or partial utilization or recycling of red mud could reduce the harmful effect on the environment. Scandium is the most valuable ingredient of red mud, yet it's extraction is poorly commercialized due to its high cost. The new efficient extraction technologies promise an ensured supply of scandium and a significant drop in cost.