Method for preparing a tantalum powder

摘要

The present invention relates to the tantalum powder and the process for preparing the same, and also relates to the electrolytic capacitor anode made of the tantalum powder. More particularly, the present invention relates to the tantalum powder having a BET surface area not more than 0.530 m2/g, Fisher mean particle size not less than 3.00 μm. The present invention relates to the process for preparing the tantalum powder, wherein the tantalum powder is prepared through reducing tantalum compound with a reducing agent, wherein the tantalum powder as seed is added during reduction, and said tantalum powder as seed is the tantalum powder that has been milled.

主权项

1. A process for preparing tantalum powder wherein the tantalum powder has a BET surface area of not more than 0.530 m2/g, and Fisher mean particle size of not less than 3.00 μm, wherein the tantalum powder is prepared by the process comprising:
mixing a tantalum compound with a dilution agent and tantalum powder as seed, wherein the tantalum powder as seed is tantalum powder that has been milled to the form of a flake powder having an aspect ratio of 5 to 20, and wherein the particle size of the tantalum powder as seed is −60 mesh; reducing the tantalum compound by adding a reducing agent to a molten mixture of the tantalum compound, dilution agent and tantalum powder as seed, wherein the reduction is carried out at a temperature of 800-1000° C.; soaking at a temperature of 700-1000° C.; and removing the tantalum powder; wherein the produced tantalum powder has a particle distribution in which particles of −325 mesh represent less than 60 vol % of all particles in the produced tantalum powder.