Method for preparing Gd-Mg intermediate alloy by fluorination system coelectrodeposition

An intermediate alloy and co-electrodeposition technology is applied in the field of preparation of Gd-Mg alloy prepared by co-electrodeposition in a fluoride molten salt electrolysis system, and can solve the problems of difficult uniformity of alloy composition, low solubility, and difficulty in determining the amount of precipitated rare earth, etc. Achieve the effect of reducing current efficiency, improving fluidity, and uniform composition

CN101117723BInactive Publication Date: 2011-01-05GANNAN NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-01-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a process for preparing of Gd-Mg intermediate alloy by composite electrodeposition of fluoridated systems. Gd and Mg are electrochemically separated at the cathode of a round or square electrolytic cell with the mixture of 80-95 wt% commercial Gd2O3 (purity higher than 95%) and MgO (purity higher than 95) as the raw material and GdF3-LiF or GdF3-LiF-BaF2 molten fluoride salts as the electrolytic medium and then alloyed to produce Gd-Mg intermediate alloy with the weight percentage of Gd higher than 85 percent. The prepared rear earth magnesium alloy has high magnesium content and uniform ingredients. The present invention has convenient operation that the electrolysis is continuously conducted and the tapping is conducted by the siphon method; the recovery of rear earth is higher than 90 percent, and the exhaust gas meets the requirement of environment protection; the intermediate alloy has low impurity content and low production cost.
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Description

Method for preparing Gd-Mg master alloy by co-electrodeposition of fluorinated system technical field The invention relates to a method for preparing a rare earth magnesium master alloy, in particular to a method for preparing a Gd-Mg alloy by co-electrodeposition in a fluoride molten salt electrolysis system. Background technique Gadolinium-magnesium master alloy is mainly used in the preparation of high-performance heat-resistant magnesium alloys, and its service temperature can reach above 300°C. Gadolinium is one of the best elements to improve the heat-resistant properties of magnesium alloys. There are two kinds of molten salt electrolysis systems that can be used for the production of rare earth magnesium alloys by molten salt electrolysis: chloride system and fluoride system. Although some patents have been applied for chloride systems, such as Chinese Patent No. 200510119117.2, Chinese Patent No. 94113824, and Chinese Patent No. 94113824, they all use rare earth ...

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