Rare earth fluoride and its production method

A technology of rare earth fluoride and production method, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as restricting application and development, and achieve the effects of stable product quality and simple production method

Inactive Publication Date: 2014-07-16
QIANDONG RARE EARTH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the application and development of high-purity rare earth metals and a...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Place the commercially available lanthanum fluoride raw material in a tungsten crucible and put it into a vacuum resistance furnace, install a molybdenum collection cover with openings on the upper part (open holes are conducive to the escape of volatile substances) on the crucible, and connect the outside of the molybdenum collection cover Water cooling; vacuumize and keep the absolute pressure in the resistance furnace ≤ 10Pa, heat up, keep warm after the temperature of the lanthanum fluoride raw material in the crucible reaches 1450 °C, and control the temperature of the collection cover by water cooling to ≤ 1000 °C; stop heating, take out after cooling and collect cover and attached lanthanum fluoride. The content of non-rare earth impurities in the distilled rare earth fluoride products was measured, and O was measured by LeCo TC400 oxygen and nitrogen analyzer. The following embodiments are the same.

[0035] Put the above-mentioned lanthanum fluoride taken from...

Embodiment 2

[0041] Put the dysprosium fluoride raw material into a molybdenum crucible and place it in a vacuum resistance furnace, and install the molybdenum collection cover on the crucible; vacuumize and keep the absolute pressure in the resistance furnace ≤ 20Pa; heat up and control the distillation temperature to 1350±50°C , control the temperature of the collection cover to ≤900°C; stop heating, and take out the collection cover and attachments after cooling. Peel off the attachment on the molybdenum flake collection cover is dysprosium fluoride product. The analysis results of dysprosium fluoride before and after distillation are shown in Table 2:

[0042]Table 2: Detection results of dysprosium fluoride before and after distillation (unit: wt%)

[0043] Non-rare earth impurities O SiO 2 C Fe 2 o 3 Al 2 o 3 CaO before distillation 0.12 0.01 0.02 0.01 0.10 0.091 after distillation 0.01 0.004 0.005 0.006 0.005 0.005

Embodiment 3

[0045] Put the yttrium fluoride raw material into the niobium crucible and place it in the vacuum intermediate frequency furnace, install the molybdenum collection cover on the crucible; evacuate and keep the absolute pressure in the intermediate frequency furnace ≤ 20Pa to heat up, control the distillation temperature to 1300±10 degrees and Heat preservation, control the temperature of the collection hood to ≤1000°C; stop heating, let it cool naturally for 2 hours, and then flow argon gas into the collection hood to accelerate cooling. When the material in the collection hood is close to room temperature and comes out of the oven, take out the collection hood and attachments. The material on the stripping collection cover is distilled yttrium fluoride. The analysis results of yttrium fluoride before and after distillation are shown in Table 3:

[0046] Table 3: Test results before and after distillation of yttrium fluoride (unit: wt%)

[0047] Non-rare earth impuri...

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Abstract

The invention discloses a rare earth fluoride, and the purpose of obtaining a high-quality rare earth fluoride can be achieved by using a distillation purification method to reduce non rare earth impurities in a commercially available rare earth fluoride. A production method of the rare earth fluoride is simple, and the rare earth fluoride product quality is stable. The development and application of high pure rare earth metals and alloys and rare earth fluoride function materials can be facilitated.

Description

technical field [0001] The invention relates to a rare earth fluoride and a production method thereof, in particular to distilling and purifying the rare earth fluoride through a distillation method, and belongs to the field of rare earth halide preparation. Background technique [0002] Rare earth halides, including rare earth fluorides and rare earth chlorides, are important raw materials for preparing rare earth metals by electrolysis and calcithermal reduction. With the development of science and technology, the application of rare earth fluorides as raw materials for functional materials is becoming more and more extensive, and the dosage is increasing, which puts forward stricter requirements on the quality of rare earth fluorides. [0003] At present, the preparation of rare earth fluorides is mainly divided into wet preparation process and dry preparation process. [0004] The wet preparation process is to react rare earth material liquid with hydrofluoric acid or p...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 章立志龚斌蔡志双林伟清李瑞林谢楠
Owner QIANDONG RARE EARTH GRP
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