Preparation method of uniform sodium-doped ammonium paratungstate and/or yellow tungsten oxide

Abstract

The invention belongs to the technical field of tungsten smelting and in particular relates to a preparation method of uniform sodium-doped ammonium paratungstate and / or yellow tungsten oxide, which aims to solve the defect that the subsequent products are influenced by uneven growth of particles caused by the uneven distribution of sodium in the existing sodium doping process and the defects of the exiting sodium-containing WO3 production method. According to the preparation method of uniform sodium-doped ammonium paratungstate and / or yellow tungsten oxide, the sodium is doped under the strong base condition; the ammonia concentration does not need to be adjusted; the content of impurity elements in the raw material which is an ammonium tungstate solution is low; no impurity harmful to the subsequent processes is introduced into the doping raw material; the solution does not need to be washed by other substances, is directly extracted when the solution arrives at a crystallization final point, and does not need to be washed by water; the product is uniformly doped with sodium. The crystallization mother solution is small in quantity and easy to recycle and use; the doping process is few and simple to operate; sodium-containing compounds suitable for the sodium-doping process are various in types; the sodium-doped APT and yellow tungsten oxide powder prepared by the method are high in Fsss particle size; the sodium elements are uniformly distributed; the crystalline form is complete.

Description

technical field [0001] The invention belongs to the technical field of tungsten smelting, and in particular relates to a method for preparing uniformly sodium-doped ammonium paratungstate (APT) and / or yellow tungsten. Background technique [0002] Coarse-grained cemented carbide has a series of advantages such as good toughness, high hardness, high thermal conductivity, and good red hardness. It is widely used in mining tools, stamping dies, oil drilling, hard surface materials and other fields. The main process of preparing coarse-grained cemented carbide in domestic production is to add alkali metal to APT or tungsten trioxide, prepare coarse-grained tungsten (W) powder after hydrogen reduction, and obtain coarse-grained WC powder through high-temperature carbonization, and then wet grinding , forming, and sintering processes to prepare coarse-grained cemented carbide. [0003] At present, the conventional method of doping alkali metal in production is the mechanical mixi...

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Problems solved by technology

[0005] The present invention aims at the existing doping sodium salt process, the distribution of sodium is uneven, resulting in uneven particle growth, affecting subsequent products and the current sodium-containing WO 3 Due to the shortcomings of the production method, a preparation method of uniform sodium-doped APT and yellow tungsten with a simple process is proposed to solve the defects of the existing process and improve the performance of the powder product.

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