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Method for preparing magnesium-rare earth alloy by fused salt electrolysis process

A magnesium rare earth alloy and molten salt electrolysis technology are applied to the preparation of magnesium rare earth alloys and the field of magnesium rare earth alloys prepared by molten salt electrolysis, which can solve the problems of high raw material preparation cost and uneven feeding, and achieves reduced preparation cost, uniform composition, good quality effect

Active Publication Date: 2009-12-30
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main problems in this process: (1) The raw material for electrolysis needs to be partially or completely dehydrated, and the cost of raw material preparation is relatively high; (2) It is intermittent feeding, and the feeding is uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, after lanthanum chloride heptahydrate and magnesium chloride hexahydrate are respectively crushed, after mixing according to the mol ratio of lanthanum and magnesium in the ratio of 1:4, transfer to the waste graphite crucible with holes at the bottom, then place the graphite crucible At the edge above the electrolytic tank, the electrolytic raw materials are roasted by using the heat released by the high-temperature molten salt electrolyte, and then added dropwise to the electrolyte for feeding. Potassium chloride is used as electrolyte, metal molybdenum rod is used as cathode, and graphite crucible is used as anode for electrolysis. The electrolysis current is 1200A, the electrolysis voltage is 11.5V, and the electrolysis temperature is 860°C. The obtained magnesium rare earth alloy contains about 20wt% of rare earth. .

Embodiment 2

[0014] Embodiment 2, after lanthanum chloride hexahydrate and magnesium chloride hexahydrate are respectively crushed, after mixing according to the molar ratio of lanthanum and magnesium in the ratio of 2:3, transfer to the waste graphite crucible with holes at the bottom, then place the graphite crucible At the edge above the electrolytic tank, the electrolytic raw materials are roasted by using the heat released by the high-temperature molten salt electrolyte, and then added dropwise to the electrolyte for feeding. Potassium chloride was used as electrolyte, metal molybdenum rod was used as cathode, and graphite crucible was used as anode for electrolysis. The electrolysis current was 1100A, the electrolysis voltage was 12.0V, and the electrolysis temperature was 870°C. The obtained magnesium rare earth alloy contains about 40 wt% of rare earth.

Embodiment 3

[0015] Embodiment 3, after lanthanum chloride hexahydrate or heptahydrate and magnesium chloride tetrahydrate are respectively crushed, after mixing according to the mol ratio of lanthanum and magnesium in the ratio of 2: 3, transfer to the waste graphite crucible with holes at the bottom, and then The graphite crucible is placed on the edge of the electrolytic tank, and the electrolytic raw materials are roasted by using the heat released by the high-temperature molten salt electrolyte, and then added dropwise to the electrolyte for feeding. Potassium chloride was used as electrolyte, metal molybdenum rod was used as cathode, and graphite crucible was used as anode for electrolysis. The electrolysis current was 1150A, the electrolysis voltage was 12.0V, and the electrolysis temperature was 870°C. The obtained magnesium rare earth alloy contains about 40 wt% of rare earth.

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Abstract

The invention discloses a method for preparing magnesium-rare earth alloy by a fused salt electrolysis process. The method comprises the following steps: taking hydrated magnesium chloride and hydrated rare earth chloride as raw materials for electrolysis, taking potassium chloride as electrolyte, taking molybdenum rod as a cathode or taking liquid rare earth metal or liquid magnesium rare earth alloy as a subsidence cathode, taking graphite crucible as an anode, and performing direct current electrolysis at current of 1,000-2,000A, voltage of 5-15V and temperature of 800-1,000 DEG C to obtain magnesium-rare earth alloy liquid at the cathode. The obtained magnesium-rare earth alloy contains 5-95 wt% of rare earth. The method is characterized by taking the hydrated magnesium chloride and the hydrated rare earth chloride as raw materials for electrolysis, which can obviously reduce preparation cost of the raw materials for electrolysis; specially adding the rare earth chloride in liquid state to the fused salt electrolyte dropwise, which can save production cost of the raw materials for electrolysis and ensure smooth electrolysis; and the obtained magnesium-rare earth alloy product has uniform components, good quality and no aliquation.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a preparation method of a magnesium rare earth alloy, in particular to a method for preparing a magnesium rare earth alloy by using hydrous magnesium chloride and hydrous rare earth chloride as raw materials and adopting a molten salt electrolysis method. Background technique [0002] Magnesium alloy is a lightweight material with properties such as noise absorption, shock absorption and radiation protection. It has been used in the aerospace field since the 1940s. However, it is difficult to be widely used because of high cost, poor heat resistance and difficult smelting and preparation technology. Adding rare earths to magnesium alloys can produce purification, refinement and alloying effects, thereby improving the casting process of magnesium alloys and reducing porosity. Compared with traditional magnesium alloy materials, the new rare earth magnesium alloys formed ha...

Claims

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Application Information

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IPC IPC(8): C25C3/36
Inventor 吴志坚孙庆国李权火焱
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI