A kind of preparation method of tantalum-niobium composite carbide

Abstract

The invention relates to a preparation method of tantalum and niobium composite carbide. The preparation method of the tantalum and niobium composite carbide is characterized by comprising the following technical processes: selecting a tantalum-containing solution and a niobium-containing solution which are produced by an HF-H2SO4 system extraction technology; performing precise calculation according to a tantalum-niobium ratio of the tantalum and niobium composite carbide required to be produced, and mixing the tantalum-containing solution and the niobium-containing solution; adding a precipitant A, and performing chemical co-precipitation reaction to obtain a tantalum hydroxide and niobium hydroxide mixed slurry; eluting the tantalum hydroxide and niobium hydroxide mixed slurry with ammonia water or purified water, and drying eluent to obtain tantalum hydroxide and niobium hydroxide mixed powder; roasting the mixed powder at 800-1200 DEG C to obtain a precursor of the tantalum and niobium composite carbide; and adding carbon black, carbonating the carbon black in vacuum, performing ball milling, and sifting the carbon black to obtain a finished product, namely the tantalum and niobium composite carbide. A tantalum oxide and niobium oxide mixture is prepared by a chemical co-precipitation method, so that energy sources and auxiliary materials are saved, and raw materials are mixed more uniformly; in the co-precipitation method, the auxiliary materials are not mixed, so that a doping opportunity is reduced and precise control and calculation of components are very easy; therefore, a tantalum and niobium composite which has a relatively narrow grain distribution range and is more uniform can be prepared.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal production, in particular to a preparation method of tantalum-niobium composite carbide. Background technique [0002] At present, the production of tantalum-niobium composite carbide products, the known production process is described in GB / T 26061-2010 "Tantalum-Niobium Composite Carbide" as follows: [0003] Tantalum oxide, niobium oxide + carbon black → batching, mixing → primary carbonization → ball milling, sieving → mixing, sampling analysis → deployment, mixing → vacuum secondary carbonization → ball milling, sieving → sampling analysis → product. [0004] Changsha Weiwei High-tech New Materials Co., Ltd. applied for a patent on 2011.05.31 "A Preparation Method of Ultrafine Tantalum Niobium Carbide Solid Solution Powder" (Patent No.: 201110145783), providing a preparation method of ultrafine Tantalum Niobium Carbide Solid Solution , the process flow is: slurry tantalum hydroxide,...

AI Technical Summary

Problems solved by technology

[0005] In the above method, the production of tantalum-niobium composite carbide uses solid oxide powder and hydroxide powder respectively, and the production of tantalum-niobium oxide or hydroxide will consume more energy and raw materials

Moreover, in the production process, powder materials are mixed mechanically, and the uniformity and chemical activity of relative ions are poorly mixed in the solution, and carbonization is difficult, so it is difficult to realize continuous automatic production of equipment

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