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Preparation method and application of ultra-pure scandium oxide

A scanning scandium oxide, ultra-high technology, applied in the field of metallurgy, can solve the problems of scandium oxide low purity, high cost, and complicated preparation process operations

Active Publication Date: 2021-09-10
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the above problems, the object of the present invention is to provide a preparation method and application of ultra-high-purity scandium oxide, so as to solve the problem that the scandium oxide prepared by the existing scandium oxide preparation method has low purity and cannot deeply remove the actinides uranium, thorium, Lanthanide rare earth elements, titanium and zirconium, and the preparation process is complicated and expensive

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  • Preparation method and application of ultra-pure scandium oxide
  • Preparation method and application of ultra-pure scandium oxide
  • Preparation method and application of ultra-pure scandium oxide

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preparation example Construction

[0025] figure 1 It schematically shows the process flow of the method for preparing ultra-high-purity scandium oxide in an alternative embodiment of the present invention. Such as figure 1 As shown, the preparation method of a kind of ultra-high-purity scandium oxide provided by the present invention can comprise: to coarse scandium oxide, adopt acid / conditioning agent to carry out acid dissolution / conditioning, remove uranium (iron), remove zirconium, remove rare earth and other impurities, washed with hydrochloric acid, analyzed / retracted with stripping agent, tempered with acid to remove thorium, uranium and rare earth impurities, etc., precipitated and calcined to obtain ultra-high-purity scandium oxide.

[0026] This embodiment of the present invention mainly realizes the ultra-high purification preparation of scandium under the hydrochloric acid system. This method can not only deeply remove actinide elements uranium and thorium, lanthanide rare earth elements, titanium...

Embodiment 1

[0063] The entire process of this embodiment is carried out in a 10,000-class clean laboratory. The main components of crude scandium oxide in this example are shown in Table 1 below.

[0064] Table 1 Main impurities of crude scandium oxide (g / t)

[0065] Sc2O3 99.01％ Sc2O3 / REO 99.97％ La2O3 22.8 Al2O3 15.3 CeO2 28.2 ZrO2 15.8 Nd2O3 22.5 ThO2 307 Y2O3 60.8 U2O3 5 Er2O3 52.1 CuO 8.2 Rare earth impurities 259.2 V2O5 9.1 Fe2O3 61.2 Na2O 170 CaO 50 NiO 6.9 SiO2 38 TiO2 9.2

[0066] First, use hydrochloric acid to dissolve the crude scandium oxide sample; adjust the acidity to 9M; filter the filtrate first through a N235 resin column to remove iron and uranium; then pass through TBP resin to remove trace zirconium (the amount of resin is too high, resulting in a decrease in the direct yield of scandium); Then extract with TBP (solvent), extraction condition TBP 100%, O / A 1:1, extracti...

Embodiment 2

[0074] The entire process of this embodiment is carried out in a 10,000-class clean laboratory. The main components of crude scandium oxide in this example are also shown in Table 1.

[0075] First, use hydrochloric acid to dissolve the crude scandium oxide sample; adjust the acidity to 8M; filter the filtrate through an N235 resin column to filter out iron and uranium; then pass TBP resin to remove trace zirconium (the amount of resin is too high to cause the direct recovery of scandium to decline); Extract with TBP (solvent), extraction conditions TBP 50%, O / A 2:1, extraction reaction time 5min, cross-flow extraction 2 stages; then use 8M hydrochloric acid to wash the loaded organic phase, washing conditions O / A 2:1, wash Time 5min; back extraction with 3M HCl for back extraction, back extraction ratio O / A 2:1, time 5min, cross-flow washing 2 levels; add a small amount of nitric acid to control the effective ion concentration of nitrate should be ≥ 0.05mol / L, conditioning T...

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Abstract

The invention discloses a preparation method and application of ultra-pure scandium oxide. The preparation method comprises the following steps of: carrying out acid dissolution on coarse scandium oxide or scandium chloride; hardening and tempering by adopting strong acid, and purifying by adopting an extracting agent and / or extraction resin after hardening and tempering; and purifying and precipitating to obtain the ultra-pure scandium oxide. According to the method, rare earth impurity elements and common trace elements in scandium oxide can be removed, and deep removal of difficult-to-remove trace uranium and thorium elements and trace impurities including zirconium and titanium in scandium oxide can also be achieved; and the method is simple in operation process, has high practical operability, does not involve organic, weak base or strong base reverse extraction, does not cause scandium loss, and can reduce the initial equipment investment cost and energy consumption.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation method and application of ultra-high-purity scandium oxide. Background technique [0002] Scandium and its compounds have many excellent properties, and are widely used in energy materials, superconductivity, electronic products, etc. The purity of scandium and its compounds is also very high in the application process, for example, for the preparation of GSGG and GSAG lasers The zirconium impurity in the scandium oxide of the bar should be less than 5ppm, and the zirconium content in the 99.999% scandium oxide product should also be less than 10ppm, but the current scandium oxide separation and purification process is difficult to meet such high purity requirements. [0003] Chinese patent CN104342559B discloses a method for comprehensively recovering various elements from zirconium oxychloride waste liquid. Although the purity of this method has been improved, ...

Claims

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Application Information

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IPC IPC(8): C01F17/10C01F17/212
CPCC01F17/10C01F17/212
Inventor 刘召波王玮玮陈宋璇姚亮刘国
Owner CHINA ENFI ENGINEERING CORPORATION
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