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Composite crucible for preparing rare earth-magnesium intermediate alloy by molten salt electrolysis and preparation method thereof

An intermediate alloy, molten salt electrolysis technology, applied in the direction of crucible furnace, lighting and heating equipment, process efficiency improvement, etc. The effect of deposition and preventing leakage and creepage

Inactive Publication Date: 2009-07-29
LINJIANG DONGFENG NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Magnesium and rare earth elements are very chemically active at high temperatures, so that most elements and compounds in nature react with them easily at high temperatures; this brings difficulties to the selection of crucible materials for high-temperature smelting or high-temperature production of their products
Chinese patent No. 03104875.7 and No. 200410013710.4 respectively disclose the patents titled "a crucible for smelting magnesium alloys and its preparation process" and "crucible specially for smelting magnesium alloys". , the outer layer of 1Cr18Ni9Ti stainless steel, the metal crucible compounded by the two is more practical for smelting general magnesium application alloys, but it is difficult to smelt rare earth-magnesium master alloys containing high concentrations of rare earths
However, it is difficult to extend the composite crucible from steel smelting to electrolytic production of rare earth-magnesium master alloys, because the CaO layer will be re-sintered at a high temperature of about 1500°C at the steelmaking temperature to become strong, while electrolytic In the production of rare earth-magnesium master alloys, the CaO layer has no re-sintering effect at a temperature lower than 1000 ° C, and the CaO layer is easy to fall off during use and become invalid
Another Chinese patent No. 03108420.6 discloses an invention patent titled "surface-modified quartz glass crucible and its modification method". In this invention, the coating of CaO, BaO, SrO, etc. on the surface of the quartz glass crucible also has the problem of shedding, and The quartz exposed after falling off quickly interacts with the metal magnesium, resulting in scale-like shattering
At present, the corundum crucible used in the electrolytic preparation of rare earth-magnesium master alloys in the laboratory is ideal in terms of avoiding impurities, insulation, and anti-seepage, but when it is expanded to industrial production, the price is too high and due to excessive volume. It is difficult to solve the problem of easier burst caused by large

Method used

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  • Composite crucible for preparing rare earth-magnesium intermediate alloy by molten salt electrolysis and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0016] The innermost crucible 5 selects magnesia with a purity of more than 99.5%, and adds chemically pure B that accounts for 15% by weight of magnesia. 2 o 3 1. Press into a magnesia inner layer crucible with an isostatic pressing process, and its thickness is 10mm; on the outside of the magnesia inner layer crucible, add a layer of common aluminum powder cement, the thickness of which is 8mm, and then dry in the shade, dry and After sintering at 650°C for 24 hours, the height and inner diameter are H=320mm and Φ respectively. 内 = 300 mm innermost crucible 5 . The middle crucible 3 selects a 4mm thick metal titanium plate, and after winding and argon arc welding, the height and inner diameter are respectively H=310mm and Φ 内 A garden tubular metal titanium crucible with one end closed of =370mm. The outermost crucible 2 is a commercially available common aluminum porcelain crucible. Its height and inner diameter are respectively H=320mm, Φ 内 = 460mm. Assembling and co...

Embodiment 2

[0018] All the other are with embodiment 1. The Ti crucible among the embodiment 1 is replaced with graphite crucible, and its inner diameter is Φ 内 =350mm, the graphite crucible is a Φ500mm industrial dense graphite column, cut out a round tube with a side wall thickness of 25mm and one end closed, and the thickness of the closed end of the round tube is 1.2 times that of the side wall. After 7 days of continuous electrolysis of the composite crucible to produce rare earth-magnesium intermediate alloys, the furnace was cleaned to observe the life of the crucible. The crucible was in good condition.

Embodiment 3

[0020] All the other are with embodiment 1. The Ti crucible among the embodiment 1 is replaced with a Nb crucible, and its inner diameter Φ 内 =355mm, this Nb crucible is to choose the plate material of the niobium of purity 99%, and the thickness of plate material is 4mm, through coiling and vacuum welding process, makes the garden tube formula crucible of one end closure. The outermost commercially available ordinary aluminum porcelain crucible was replaced by a commercially available high alumina porcelain crucible. After 20 days of continuous electrolysis of the composite crucible to produce rare earth-magnesium intermediate alloys, the furnace was cleaned to observe the life of the crucible, except for two tiny cracks on the inner wall of the crucible. Except for the cracked block, everything else is intact. After continuing to use, the furnace is in normal condition.

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Abstract

The invention relates to a compound pot which uses the melt salt to electrolysis produce the rare earth-magnesium alloy and relative producing method. The compound pot comprises a inner pot (5), a middle pot (3) and a outer pot (2) which are embedded compounded, while the spaced between them are filled by the powder layer (4) of rare-earth oxide without rare-earth carbonate and the power layer (6) of rare-earth oxide without rare-earth oxalate; the inner pot (5) is best selected from the constant-cold stable compressed magnesia pot or the magnesia pot whose outer part is hot compressed with aluminum powder; the middle pot (3) is best selected from the graphite, metallic niobium or metallic titanium pot; and the outer pot (2) is best selected from the aluminum, high aluminum, silicon carbide or silicon carbide nitride pot. The invention can solve the problem of present single pot of explosion, salt leakage, bringing in metallic matters or reacting with the SIO2.

Description

Technical field: [0001] The invention relates to a composite crucible for producing a rare earth-magnesium master alloy by molten salt electrolysis and a preparation method thereof. Background technique: [0002] Magnesium and rare earth elements are very chemically active at high temperatures, so that most elements and compounds in nature react with them easily at high temperatures; this brings difficulties to the selection of crucible materials for high-temperature smelting or high-temperature production of their products. Chinese patent No. 03104875.7 and No. 200410013710.4 respectively disclose the patents titled "A crucible for melting magnesium alloy and its preparation process" and "Crucible specially for melting magnesium alloy". , the outer layer of 1Cr18Ni9Ti stainless steel, the metal crucible compounded by the two is more practical for smelting general magnesium application alloys, but it is difficult to smelt rare earth-magnesium master alloys containing high co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/04F27B14/00C25C3/36
CPCY02P10/25
Inventor 孟健张洪杰吴耀明牛小东唐定骧赵连山王立民
Owner LINJIANG DONGFENG NON FERROUS METALS