Overview and Application of Scandium Oxide

The chemical formula for scandium oxide is Sc2O3. Properties: white solid. Cubic structure with rare earth sesquioxide. Density 3.864. Melting point 2403℃±20℃. Insoluble in water, soluble in hot acid. By the thermal decomposition of scandium salt obtained. It can be used as an evaporation material for semiconductor plating. Made variable wavelength solid-state lasers, high-definition television electron guns, metal halide lamps, etc.

Scandium oxide production process

Production technology and equipment After years of research and production practice, the current technology for extracting Sc2O3 from scandium-containing raw materials has the following methods:

①Extraction method. It is widely used in production, and it has the characteristics of large output, good quality, high recovery rate, low cost and continuous operation in production.

② ion exchange method. It is also often used in production. It has the characteristics of small output, high purity, low yield, high cost and long production cycle.

③ Extract resin chromatography. It has the characteristics of short production cycle, high purity, high yield and low cost.

④ liquid membrane extraction. It is a new separation technology combining membrane separation and liquid-liquid extraction. But there is no production practice yet. Someone once used an emulsion membrane to contain Sc at 60 mg/L, and Sc can be enriched to 1400 mg/L by first-stage extraction. Judging from the extraction of Sc2O3 in my country for many years, almost the first two processes are adopted.

Technology (extraction and ion exchange) is the main method.

Extraction

(1) The process of producing scandium oxide from scandium concentrate by extraction method: after dissolving scandium concentrate with hydrochloric acid, ScCl3 solution is obtained, and then purification is carried out to remove impurities such as titanium and iron. The purified liquid is used as the raw material. The extractant is made of 50% tributyl phosphate (TBP) and kerosene. The prepared feed liquid and extractant are put into the extraction tank to extract scandium, after pickling and distilled water back-extraction scandium, a pure scandium-containing liquid (ScCl3 liquid) is obtained and then oxalic acid is used for precipitation, drying and burning to obtain pure Sc2O3 product . The main process is: scandium concentrate - acid dissolution - purification - TBP extraction scandium - acid washing - back extraction scandium - oxalic acid precipitation - drying - burning - packaging - storage (pure Sc2O3 product).

Main equipment: acid dissolving tank, extraction tank, sedimentation tank, burning furnace and packaging machine, etc.

ion exchange method

Technological process: use tungsten waste residue (including Sc2O378g/t～377g/t) as raw material. It is dissolved with hydrochloric acid and filtered, the feed liquid is purified to remove impurities, and the ScCl3 clean liquid is obtained and used as the feed liquid for ion exchange after deployment. Prepare the adsorption column and the separation column for later use. The feed liquid (ScCl3 liquid) flows into the adsorption column from the upper end of the column to reach Sc3+ saturation for use. After connecting the adsorption column and the separation column in series, the eluent flows from the top of the adsorption column into and flows through the separation column, and when the last separation column flows out of the ScCl3 liquid stably, the ScCl3 liquid (pure ScCl3 liquid) can be continuously received. In the collection container, adjust the acidity and then use oxalic acid for precipitation, filter, dry and burn into pure Sc2O3 product. The main process is: tungsten waste residue - acid dissolution - purification - adsorption column - washing - receiving ScCl3 solution - acid adjustment - precipitation scandium - drying - burning - packaging - storage (pure Sc2O3 product).

Main equipment: acid-dissolving tank, adsorption column, separation column, sedimentation tank, burning electric furnace and packaging machine, etc.

Extraction resin chromatography

Technological process: after dissolving chlorinated smoke and dust with HCl, purify and remove impurities to make ScCl3 feed liquid. Use 50% TBP-kerosene extractant to extract scandium in the extraction tank, pickle impurities and strip scandium to obtain pure Sc-Cl3 solution, then use H2C2O4 to precipitate Sc, and burn to obtain pure Sc2O3. The main process is: oxidation fume-dissolving hydrochloric acid-purifying-purifying ScCl3 liquid-extraction-pickling-back-extraction-precipitation-burning-packaging-warehousing (pure Sc2O3 product).

liquid film extraction

Using titanium dioxide waste liquid (containing Sc2O3 25g/m3) as raw material. In the sulfuric acid medium system with P204-kerosene as the extraction agent, scandium is extracted from the feed liquid in the extraction tank. After pickling with H2SO4 and H2O2 to remove impurities, the scandium is stripped back with NaOH liquid to make Sc(OH)3 enrichment. , Hydrochloric acid dissolves Sc(OH)3 to become ScCl3 solution, oxalic acid precipitates scandium (twice) and burns, and the package is pure Sc2O3 product. The main process is: titanium dioxide waste liquid - preparation - extraction - acid washing - back extraction - Sc(OH)3 product - dissolution - precipitation - burning - packaging - storage (pure Sc2O3 product).

Scandium Oxide Sc2O3 Powder Overview

Scandium oxide is an inorganic compound with the formula SC2O3. It is one of several oxides of high-melting rare earth elements. It is used in the preparation of other scandium compounds as well as in high temperature systems (due to its thermal and thermal shock properties), electronic ceramics and glass components (as an auxiliary material). The chemical formula for scandium oxide is SC2O3. Properties: white solid. Cubic structure, rare earth sesquioxide. The density is 3.864. The melting point is 2403°C ± 20°C. Insoluble in water, soluble in hot acid.

Scandium oxide is one of the most important scanning products. Its physicochemical properties are similar to rare earth oxides (such as La2O3, Y2O3, Lu2O3), so the production methods used in production are very similar. SC2O3 produces scandium (Sc) metal, products of various salts and metals. Various alloys. These scandium products have practical technical value and good economic benefits. Because SC2O3 has certain characteristics, it has been widely used in aluminum alloys, electric light sources, lasers, catalysts, activators, ceramics, aerospace and other fields, and the development prospects are very broad.

Application of Scandium Oxide Sc2O3 Powder

Due to the unique physical and chemical properties of SC2O3 products, scandium oxide Sc2O3 powders have been applied and developed in many high-tech and industrial fields since the 1980s.

1. Application of scandium oxide Sc2O3 powder in alloy

At present, scandium-aluminum alloy has good composition consistency, and aluminum has the advantages of low density, high strength, high hardness, strong plasticity, corrosion resistance, and strong thermal stability. Therefore, it is more suitable for use in missiles such as aerospace, aviation, automotive and ship structures. Good applications are gradually turning to civilian use, such as sports (hockey and baseball handlebars) equipment, computers and their subsequent equipment, which have the characteristics of high strength, high rigidity, and light weight.

2. Application of Scandium Oxide Sc2O3 Powder as New Electric Light Source Material

After converting pure SC2O3 into SCI3 and NAI, a new third-generation electric light source material is made and processed into sodium halide-sodium lamps for lighting (each lamp with SC2O3≥99% material is 0.1mg~10mg. Under the action of high pressure , the scanning spectral line is blue, and the sodium spectral line is yellow. The two colors cooperate with each other to generate light close to the sun, so it has high luminosity, good light color, energy saving, long life, and strong dehazing.

3. Application of scandium oxide Sc2O3 powder laser material

Added gallium garnet (GGSG) can be prepared by adding gallium garnet (GGG) in the form of Gd3SC2Ga3O12 with a purity of ≥99.9%. The emission power of the third-generation laser made of it is 3.0 times that of the same volume laser, achieving a high-power, miniaturized laser device, increasing the output power of laser oscillation and improving the performance of the laser. When preparing single crystal, each feeding is 3kg~5kg, and the raw material SC2O3≥99.9% is about 1.0kg.

4. Application of Scandium Oxide Sc2O3 Powder Electronic Materials

Pure SC2O3 can be used as an oxidizing cathode activator for cathode guns of color picture tubes. A layer of Ba, Sr, Ca oxides with a thickness of 1mm is sprayed on the upper end of the cathode of the color tube, and a layer of SC2O3 with a thickness of 0.1mm is dispersed on it. In the cathode of the oxide layer, Mg, Sr, and Ba react to promote the reduction of Ba, and the released electrons are more active, emitting electrons with a large current, so that the phosphors emit light. The current density can be increased compared to the cathode without SC2O3 coating. 4 times, the TV picture is clearer, and the life of the cathode is increased by 3 times. The amount of SC2O3 is 0.1 mg per 21-inch imaging cathode.

Scandium oxide Sc2O3 powder price

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