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Alkaline-earth oxide crucible with rare-earth oxyfluoride coating and preparation method of alkaline earth oxide crucible

A rare earth oxide and rare earth fluoride technology, applied in crucible furnaces, lighting and heating equipment, furnace types, etc., can solve problems such as being unsuitable for large-scale industrial production, strong water absorption of calcium oxide, and low coating density. The effect of strong resistance to metal or alloy liquid corrosion, high density and low porosity

Active Publication Date: 2020-07-14
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of coating has low density and large porosity, which is not suitable for large-scale industrial production.
[0005] However, the crucible used above will still bring in impurities when smelting rare earth metals and their alloys, and calcium oxide is extremely water-absorbing and easily pulverized, requiring vacuum or high temperature storage

Method used

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  • Alkaline-earth oxide crucible with rare-earth oxyfluoride coating and preparation method of alkaline earth oxide crucible
  • Alkaline-earth oxide crucible with rare-earth oxyfluoride coating and preparation method of alkaline earth oxide crucible
  • Alkaline-earth oxide crucible with rare-earth oxyfluoride coating and preparation method of alkaline earth oxide crucible

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preparation example Construction

[0025] A method for preparing an alkaline earth oxide crucible with a rare earth oxyfluoride coating, comprising:

[0026] Step 1: Coating ingredients, mix rare earth oxides, rare earth fluorides, and polyvinyl alcohol evenly according to the weight ratio of 100:0.2-50:5-15;

[0027] The rare earth oxide corresponds to the rare earth element of the rare earth fluoride. That is, the same rare earth elements are used in rare earth oxides and rare earth fluorides.

[0028] Rare earth fluorides are selected from lanthanum fluoride, cerium fluoride, praseodymium fluoride, neodymium fluoride, samarium fluoride, europium fluoride, gadolinium fluoride, terbium fluoride, dysprosium fluoride, holmium fluoride, baitium fluoride, fluoride One of thulium, ytterbium fluoride, lutetium fluoride, yttrium fluoride or scandium fluoride.

[0029] Lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, lanthanum cerium oxide, praseodymium neodymium oxide, mixed rare earth metal oxid...

Embodiment 1

[0042] 1500g of lanthanum oxide, 3g of lanthanum fluoride, and 80g of polyvinyl alcohol are uniformly mixed and pressed into a coating in a 10kg magnesia crucible. ) smelting to achieve better results, the deoxidation effect is as follows:

[0043] Table 1 Deoxidation effect of lanthanum-iron alloy

[0044]

[0045] In industrial production, pure magnesium oxide crucibles are used to prepare lanthanum-iron alloys. The oxygen in the lanthanum-iron alloy is about 100ppm, and now it is about 20ppm, and the deoxidation effect is obvious.

Embodiment 2

[0047] 1500g of cerium oxide, 450g of cerium fluoride, and 200g of polyvinyl alcohol are uniformly mixed and pressed into a coating in a 10kg alumina crucible. After drying and roasting through the aforementioned process, cerium-iron alloy (Ce 20wt%) Melting, to achieve better results, the deoxidation effect is as follows:

[0048] Table 2 Deoxidation effect of cerium-iron alloy

[0049]

[0050] In industrial production, pure alumina crucibles are used to prepare cerium-iron alloys, the oxygen content is about 50ppm, and now it is about 12ppm, and the deoxidation effect is obvious.

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Abstract

The invention discloses an alkaline-earth oxide crucible with a rare-earth oxyfluoride coating, the rare-earth oxyfluoride coating is arranged on the inner wall of the alkaline-earth oxide crucible, the density of the rare-earth oxyfluoride coating is 3-8 g / cm<3>, and the porosity of the rare-earth oxyfluoride coating is 5-20%. The invention further discloses a preparation method of the alkaline earth oxide crucible with the rare earth oxyfluoride coating. According to the invention, impurities can be prevented from being brought in during smelting of rare earth metals and alloys thereof.

Description

technical field [0001] The invention relates to a metal and alloy smelting technology, in particular to an alkaline earth oxide crucible with a rare earth oxyfluoride coating and a preparation method thereof. Background technique [0002] Years of research have shown that the impurity content in rare earth metals and alloys directly affects the performance of the applied alloys. For example, magnesium oxide crucibles are generally used in the production of rare earth steels. Phase 6, P275-278) research shows that the use of magnesia crucible to smelt rare earth iron alloys will increase the oxygen content in the alloy, which will affect the yield of rare earth added to the steel and the effect it plays. In addition, during the process of smelting rare earth metals and alloys using magnesia, alumina or calcium oxide crucibles, the rare earth metals will react with the crucible, adding impurities to the alloy. It can be seen that it is obviously not enough to control the impu...

Claims

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Application Information

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IPC IPC(8): C04B41/87C04B35/50F27B14/10
CPCC04B41/009C04B41/5045F27B14/10C04B41/87C04B35/50C04B35/62222C04B2235/445C04B35/043C04B41/5055C04B41/0072C04B35/101C04B35/66C04B35/057
Inventor 刘玉宝侯复生高日增吕卫东李坤杨鹏飞李园
Owner BAOTOU RES INST OF RARE EARTHS