A kind of molten salt electrolysis method for preparing aluminum-scandium master alloy

A technology of molten salt electrolysis and master alloy, which is applied in the field of molten salt electrolysis for the preparation of aluminum-scandium master alloy and the preparation of aluminum-scandium master alloy, which can solve the waste of raw materials, affect the stable operation of the electrolytic cell, and cannot meet the high cost of the production process. Efficiency operation and other issues to achieve the effect of reducing production costs, high degree of automation, and high production efficiency

Inactive Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the aluminum-scandium master alloy is prepared by the molten salt electrolysis method in which metal aluminum and scandium are co-precipitated at the cathode, the high scandium oxide concentration required can easily cause scandium oxide and aluminum oxide to form at the bottom of the electrolytic cell. Precipitation not only brings great waste of raw materials, but also affects the stable operation of the electrolytic cell, which cannot meet the requirements of low-cost and high-efficiency operation in the production process

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  • A kind of molten salt electrolysis method for preparing aluminum-scandium master alloy
  • A kind of molten salt electrolysis method for preparing aluminum-scandium master alloy

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Embodiment 1

[0027] In the 160kA prebaked anode molten salt electrolyzer with point feeding, the fluoride molten salt 80%Na 3 AlF 6 -20%AlF 3 as the basic electrolyte, Al 2 o 3 with Sc 2 o 3 The cutting amount is 98.5:1.5 by mass percentage, the Sc 2 o 3 Add from the middle feeding point in the tank, Al 2 o 3 Add from other feeding points, at electrolysis temperature 940°C, current density 0.75A / cm 2 , under the condition that the pole distance is 4cm, the aluminum-scandium master alloy product with a mass percentage of scandium metal of 1.65% and a total mass percentage of aluminum and scandium of 99.2% can be obtained at the cathode. The electrolytic cell runs smoothly and the cell Al does not appear at the bottom 2 o 3 or Sc 2 o 3 precipitation phenomenon.

Embodiment 2

[0029] In the 160kA prebaked anode molten salt electrolyzer with point feeding, the fluoride molten salt 80%Na 3 AlF 6 -8% Li 3 AlF 6 -12%AlF 3 as the basic electrolyte, Al 2 o 3 with ScCl 3 The blanking amount is 96.2:3.8 by mass percentage, with ScCl 3 Add from the middle feeding point in the tank, Al 2 o 3 Add from other feeding points, at electrolysis temperature 945°C, current density 0.85A / cm 2 , under the condition that the pole distance is 4cm, an aluminum-scandium master alloy product with a metal scandium mass percentage content of 2.13% and a total mass percentage content of aluminum and scandium of 99.5% can be obtained at the cathode. The electrolytic cell runs smoothly, and the cell Al does not appear at the bottom 2 o 3 or ScCl 3 precipitation phenomenon.

Embodiment 3

[0031] In the 160kA prebaked anode molten salt electrolyzer with point feeding, the fluoride molten salt 66%Na 3 AlF 6 -16%K 3 AlF 6 -18%AlF 3 as the basic electrolyte, Al 2 o 3 with ScF 3 The cutting amount is 97.5:2.5 by mass percentage, the ScF 3 Add from the middle feeding point in the tank, Al 2 o 3 Add from other feeding points, at electrolysis temperature 900°C, current density 0.88A / cm 2, under the condition that the pole distance is 4cm, an aluminum-scandium master alloy product with a metal scandium mass percentage content of 1.97% and a total mass percentage content of aluminum and scandium of 99.6% can be obtained at the cathode. The electrolytic cell runs smoothly, and the cell Al does not appear at the bottom 2 o 3 or ScF 3 precipitation phenomenon.

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Abstract

The invention belongs to the technical field of molten salt electrolysis, and in particular relates to a molten salt electrolysis method for preparing an aluminum-scandium intermediate alloy. The molten salt electrolysis method comprises the following steps: in a point charging type pre-baked anode molten salt electrolytic tank, by taking fluoride molten salt M3AlF6-AlF3 as a basic electrolyte system and taking aluminum oxide and a scandium-containing compound as raw materials, performing electrolysis in different cathode regions in the same electrolytic tank to dissolve out metal aluminum and metal scandium by adopting an independent charging mode, and alloying metal aluminum and metal scandium to obtain an aluminum-scandium intermediate alloy product of which the scandium content is 1.5-3.0% and the total mass percentage of aluminum and scandium is more than 99%. The aluminum-scandium intermediate alloy prepared by using the method disclosed by the invention is adjustable in component proportion, is suitable for additives of various scandium-containing aluminum alloys and other alloys, and ensures that the mechanical performance of the alloys can be significantly improved and the problems that aluminum oxide or the scandium-containing compound at the tank bottom is easy to participate and the electrolytic tank cannot be operated stably for a long time can be solved; and the method disclosed by the invention is low in production cost, high in automation degree and high in production efficiency.

Description

technical field [0001] The invention discloses a method for preparing an aluminum-scandium master alloy, in particular to a molten salt electrolysis method for preparing an aluminum-scandium master alloy, and belongs to the technical field of molten salt electrolysis. Background technique [0002] Adding scandium as a rare earth element to aluminum or aluminum alloys can not only improve the strength and toughness of aluminum alloys (the strength of aluminum alloys containing scandium is greater than 750MPa, and the elastic modulus can exceed 100GPa); it can also significantly improve the reliability of aluminum alloys. The role of weldability, heat resistance, corrosion resistance, thermal stability and resistance to neutron radiation damage is considered to be a new generation of high-performance aluminum alloy structural materials for aerospace, ships and weapons. [0003] However, since the melting point of scandium metal (1541°C) is very different from that of metal alu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
CPCC25C3/36
Inventor 田忠良赖延清杨树党建平胡勋张凯李劼
Owner CENT SOUTH UNIV
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