Method for preparing metal tantalum by adopting calcium thermal reduction method

Through the application of calcium thermal reduction method and calcium chloride flux, the problem of slow tantalum preparation speed has been solved, fast and efficient tantalum preparation has been achieved, production efficiency and purity have been improved, and energy consumption has been reduced.

CN120776144APending Publication Date: 2025-10-14NINGXIA ORIENT TANTALUM INDUSTRY CO LTD
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Patent Information

Application Number
CN202510886042.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-30
Publication Date
2025-10-14

AI Technical Summary

Technical Problem

Existing tantalum preparation methods have problems such as slow preparation speed and long cycle, especially the potassium sodium fluorotantalate reduction method is cumbersome and time-consuming, the sodium tantalum oxide/magnesium reduction method maintains high temperature for a long time, the carbon reduction method has low transfer efficiency, and the aluminothermic reduction method is complex and time-consuming.

Method used

The calcium thermal reduction method is adopted, by adding calcium chloride as a flux to tantalum pentoxide and calcium powder, so that calcium oxide and calcium chloride form a liquid eutectic, realizing solid-liquid ion mass transfer between tantalum pentoxide and calcium powder, lowering the lower limit of reaction temperature, accelerating the reaction rate, and refining and purification through a horizontal electron beam furnace.

Benefits of technology

It significantly accelerates the preparation speed of tantalum, shortens the preparation cycle, improves the purity and production efficiency of tantalum, and reduces energy consumption and production costs.

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Abstract

The invention relates to the technical field of rare metal preparation, in particular to a method for preparing metal tantalum by adopting a calcium thermal reduction method, which comprises the following steps: S1, material mixing: mixing tantalum pentoxide, calcium powder and calcium chloride according to a preset proportion to obtain a mixture; s2, synthesizing, namely putting the mixture into a high-temperature reaction device, and carrying out calcium thermal reaction, so that the calcium powder and the tantalum pentoxide react to generate tantalum and calcium oxide; s3, separation: after a product obtained in the synthesis step is cooled to room temperature, tantalum is separated from the eutectic of calcium chloride and calcium oxide, and a tantalum block is obtained; s4, smelting: smelting the tantalum block into a tantalum plate under a preset condition; thus, calcium chloride serving as a fluxing agent is added, calcium oxide generated in the reaction and calcium chloride form a liquid eutectic, a liquid environment is provided, and an ion transmission mode among raw materials is converted into solid-liquid mass transfer, so that the lower temperature limit of effective proceeding of the calcium thermal reaction is reduced, the reaction rate of tantalum pentoxide and calcium powder is greatly increased, and the preparation speed of tantalum is increased; the preparation period is shortened.
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