Titanium-tetrachloride manufacturing method

Patent metadata

Field	Value
Publication number	US-9944536-B2
Application number	US-201414429675-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 6, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A technique is provided in which valuable material is recovered from solid recovered material generated during chlorinating process of titanium-containing raw material, and in particular, in which chlorine gas and titanium-containing raw material can be efficiently separated and recovered from the solid recovered material. The method for production of titanium tetrachloride includes: a chlorinating process in which titanium-containing raw material, coke and chlorine are reacted, a recovering process in which chlorine gas, titanium oxide and coke are recovered by treating solid recovered material which is byproduced during the chlorinating process, and a reusing process in which these recovered material are reused as raw material for the chlorinating process.

First claim

The invention claimed is:

1. A method for production of titanium tetrachloride, comprising:
a) chlorinating a titanium-containing raw material with chlorine gas and coke to generate a product gas comprising titanium tetrachloride in a chlorinating furnace,
b) passing the product gas comprising titanium tetrachloride to a recovery process to separate the titanium tetrachloride gas from a solid material containing impure chlorides byproduced during the chlorinating process, unreacted titanium oxide and unreacted coke,
c) heating the separated solid material from step b) to obtain gaseous impure chlorides and fine powder solid components containing the unreacted titanium oxide and unreacted coke,
d) roasting the gaseous impure chlorides so that chlorine gas is recovered,
e) reusing at least part of the fine powder solid components from step c) and chlorine gas from step d) as raw materials for production of titanium tetrachloride,

wherein for step e), the at least part of the fine powder solid components is granulated to have a strength in order to prevent it from being broken when supplied to the production of titanium tetrachloride, the strength being in a range of 100 to 5000 gf/mm 2 ,
f) discharging a mixture comprising a portion of the titanium-containing raw material, a portion of the coke and other impurities from the chlorinating furnace during the chlorinating step a),
g) separating the titanium-containing raw material and coke from other impurities in the removed mixture by using an electrostatic separation process, resulting in upgrading of the titanium-containing raw material and coke contents, and
h) reusing the upgraded titanium-containing raw material and coke for the production of titanium tetrachloride as it is, or while adding it to the fine powder solid components recovered from the gaseous impure chlorides of step c).

2. The method for production of titanium tetrachloride according to claim 1 , wherein part of the fine powder solid components of step c) is combusted to use as a heat source for a heating process.

3. The method for production of titanium tetrachloride according to claim 1 , wherein for step e), part of the fine powder solid components is mixed with titanium-containing raw material, granulated together, and recycled as raw material for production of titanium tetrachloride.

4. The method for production of titanium tetrachloride according to claim 3 , wherein the titanium-containing raw material to be mixed corresponds to one that is on the finer side in particle size distribution of the titanium-containing raw material and is sifted and removed from a granulating process.

5. The method for production of titanium tetrachloride according to claim 1 , wherein part of the fine powder solid component of step c) is directly introduced into a fluidized layer inside of a chlorinating furnace for production of titanium tetrachloride.

6. A method for production of titanium tetrachloride, comprising:
a) chlorinating a titanium-containing raw material with chlorine gas and coke to generate a product gas comprising titanium tetrachloride in a chlorinating furnace,
b) passing the product gas comprising titanium tetrachloride to a recovery process to separate titanium tetrachloride gas from a solid material containing impure chlorides, unreacted titanium oxide and unreacted coke generated during the chlorinating process,
c) heating the solid material obtained from step b) to obtain gaseous impure chlorides and fine powder solid components containing the unreacted titanium oxide and unreacted coke,
d) roasting the gaseous impure chlorides so that chlorine gas is recovered,
e) upgrading a content of titanium-containing raw material and coke in the fine powder solid components of step c) by using an electrostatic separation process, and
f) reusing the fine powder solid components having an upgraded content of titanium-containing raw material and coke from the electrostatic separating process from step e) and the chlorine gas from step d) for the production of titanium tetrachloride,
wherein for step f), the part of the fine powder solid components having an upgraded content of titanium-containing raw material and coke of step e) is granulated to prevent a powderization before being used in the process of titanium tetrachloride production, to preserve a strength in a range of 100 to 5000 gf/mm 2 .

7. A method for production of titanium tetrachloride, comprising:
a) chlorinating a titanium-containing raw material with chlorine gas and coke to generate a product gas comprising titanium tetrachloride in a chlorinating furnace,
b) passing the product gas comprising titanium telrachloride to a recovery process to separate titanium tetrachloride gas from a solid material containing impure chlorides, unreacted titanium oxide and unreacted coke generated during the chlorinating process,
c) heating the separated solid material from step b) to obtain gaseous impure chlorides and fine powder solid components containing the unreacted titanium oxide and unreacted coke,
d) roasting the gaseous impure chlorides so that chlorine gas is recovered,
e) roasting the fine powder solid components obtained from step c) so as to remove the coke,
f) upgrading a content amount of titanium-containing raw material in the fine powder solid components after step e) by using an electrostatic separating process, and
g) reusing the fine powder solid components from which the coke has been removed and having an upgraded content of titanium-containing raw material from step f) and chlorine gas from step c) for the production of titanium tetrachloride.

Assignees

• Toho Titanium Co Ltd

Inventors

• Horikawa Matsuhide
• Tani Seiichiro
• Horiguchi Ryota
• Fukasawa Eiichi

Classifications

• C01G23/022 Primary

  Titanium tetrachloride · CPC title