公开(公告)号：US20240343601A1

公开(公告)日：2024-10-17

申请号：US18294045

申请日：2022-06-24

Applicant: Mitsui Mining & Smelting Co., Ltd.

Inventor： Ryuji MOTONO ,  Shuhei HARA ,  Taihei KUMA

IPC: C01G41/02 ,  B82Y30/00 ,  B82Y40/00 ,  C09D1/00 ,  C09D7/20

CPC classification number: C01G41/02 ,  C09D1/00 ,  C09D7/20 ,  B82Y30/00 ,  B82Y40/00 ,  C01P2002/52 ,  C01P2004/64

Abstract: A tungstic acid solution of the present invention is a tungstic acid solution containing 0.1 to 40.0 mass % of tungsten in terms of WO3, and has a particle size (D50) of 20 nm or less as measured by particle size distribution measurement using a dynamic light scattering method. A production method of a tungstic acid solution of the present invention includes a step of adding an acidic tungsten aqueous solution containing 1 to 100 g/L of tungsten in terms of WO3 to a 10 to 30 mass % ammonia aqueous solution to generate a tungsten-containing precipitate, and a step of adding an organic nitrogen compound to a tungsten-containing precipitation slurry in which the tungsten-containing precipitate is formed into a slurry state to generate a tungstic acid solution.