Method for producing aqueous zirconium chloride solution

Patent metadata

Field	Value
Publication number	US-9676635-B2
Application number	US-201415109736-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Jan 16, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A method for producing an aqueous zirconium chloride solution includes: grinding zircon sand to an average particle diameter of 10 μm or less; adding a sodium compound to the ground zircon sand to thereby obtain a mixture; firing the mixture in an iron container at 400° C. or less to thereby obtain a decomposed product; firing the decomposed product in a stainless-steel container at 400 to 1,100° C. to thereby obtain a fired product; dispersing the fired product in water to prepare a dispersion, and washing the fired product with water while adjusting the temperature of the dispersion to 70° C. or less, thereby obtaining a water-washed cake; washing the water-washed cake with hydrochloric acid with a pH of 1 to 6 to thereby obtain zirconium hydrate; and dissolving the zirconium hydrate in hydrochloric acid, and then removing insoluble components to thereby obtain a salt solution.

First claim

The invention claimed is:

1. A method for producing an aqueous zirconium chloride solution, the method comprising:
(1) step 1 Of grinding zircon sand to an average particle diameter of 10 μm or less;
(2) step 2 of adding a sodium compound to the ground zircon sand in (1) to thereby obtain a mixture;
(3) step 3 of firing the mixture in (2) in an iron container at 400° C. or less to thereby obtain a decomposed product;
(4) step 4 of firing the decomposed product in (3) in a stainless-steel container at 400 to 1,100° C. to thereby obtain a fired product;
(5) step 5 of dispersing the fired product in (4) in water to prepare a dispersion, and washing the fired product with water while adjusting the temperature of the dispersion to 70° C. or lower, thereby obtaining a water-washed cake;
(6) step 6 of washing the water-washed cake in (5) with hydrochloric acid with a pH of 1 to 6 to thereby obtain zirconium hydrate; and
(7) step 7 of dissolving the zirconium hydrate in (6) in hydrochloric acid, and then removing insoluble components to thereby obtain a salt solution.

2. The method for producing an aqueous zirconium chloride solution according to claim 1 , wherein the zircon sand in (1) is ground to an average particle diameter of 2 μm or less.

3. The method for producing an aqueous zirconium chloride solution according to claim 1 , wherein the sodium compound in (2) is a 20 to 90 wt. % aqueous sodium hydroxide solution.

4. The method for producing an aqueous zirconium chloride solution according to claim 1 , wherein the temperature of the dispersion in (5) is adjusted to 40° C. or less.

5. The method for producing an aqueous zirconium chloride solution according to claim 2 , wherein the sodium compound in (2) is a 20 to 90 wt. % aqueous sodium hydroxide solution.

6. The method for producing an aqueous zirconium chloride solution according to claim 2 , wherein the temperature of the dispersion in (5) is adjusted to 40° C. or less.

7. The method for producing an aqueous zirconium chloride solution according to claim 3 , wherein the temperature of the dispersion in (5) is adjusted to 40° C. or less.

Assignees

• Daiichi Kigenso Kagaku Kogyo

Inventors

• Kunisada Taichi
• Nochioka Nobutaka

Classifications

• C01P2006/80

  Compositional purity · CPC title

• C01G25/04 Primary

  Halides · CPC title

• C01G25/02

  Oxides · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title