Method and apparatus for manufacturing titania

A technology of titanium dioxide and preparation equipment, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology for materials and surface science, etc. It can solve the problems of difficulty in applying common equipment to continuous processes, longer preparation time, and insufficient effects, etc. problems, to achieve the effect of improving process efficiency, ensuring quality uniformity, and improving reactivity

Inactive Publication Date: 2017-10-03
莫诺利特株式会社
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In addition, Korean Patent Publication No. 2015-0076898 proposed a technology for continuously preparing titanium dioxide through the reaction of ilmenite and fluoride, but it is actually difficult to apply to the continuous production of common equipment due to the mixture of dry process and wet process. craft
Not only that, but the efficiency is reduced due to the use of solid fluoride, the preparation time becomes longer, and the by-products generated in each step of the process are discarded, which may cause environmental pollution
[0013] These patents have improved some of the problems of the existing titanium dioxide preparation methods to some extent, but their effects are not sufficient

Method used

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  • Method and apparatus for manufacturing titania
  • Method and apparatus for manufacturing titania
  • Method and apparatus for manufacturing titania

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preparation example Construction

[0066] The invention relates to a preparation method and a preparation device for efficiently and environmentally friendly preparation of titanium dioxide through a continuous process.

[0067] The conventional sulfuric acid method, hydrochloric acid method, sol-gel method and other titanium dioxide preparation methods have defects in process efficiency, safety, economy, and productivity, and generate a large amount of waste, so they have a greater impact on the environment .

[0068] In view of this, the present invention provides a preparation method and preparation device of titanium dioxide, which do not use sulfuric acid, hydrochloric acid and other dangerous or high raw material cost starting materials, but use gaseous ammonia or hydrogen fluoride to decompose ilmenite, thereby enabling Selectively prepare anatase or rutile titanium dioxide.

[0069] In addition, the preparation method and preparation device of titanium dioxide involved in the present invention are carried out...

Embodiment 1

[0142] Put a carbonaceous bowl (bowl) into a 30L rotary electric furnace to prevent internal coating, then put in 250g Ilmenite, 1250g H 2 SiF 6 (l), in NH 3 (g) Mixing and heating at 180°C for 5 hours in an atmosphere. The generated titanium compound is automatically moved to the second step section of the 30L rotary electric furnace by rotation, where impurities are removed by the first heat treatment at 350° C. for 1 hour, thereby preparing titanium fluoride.

[0143] Next, the titanium fluoride was moved to the upper end of the rotary electric furnace, and the titanium fluoride was subjected to a second heat treatment at 650°C for 4 hours, thereby preparing titanium dioxide. The obtained titanium dioxide was moved to a titanium dioxide production reactor and reacted at 1100° C. for 2 hours, thereby producing crystalline titanium dioxide.

Embodiment 2

[0145] Except that the calcination temperature in the titanium dioxide production reactor was changed to 1000° C., crystalline titanium dioxide was prepared by the same method as in Example 1.

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Abstract

The present invention relates to a method and an apparatus for producing titania. The method comprises the steps of: i) reacting ilmenite (FeTiO_3) with ammonia gas (NH_3) and hydrogen fluoride gas (HF) in an inert atmosphere to cause it to decompose into a titanium compound ((NH_3)_3TiF_7) and an iron compound ((NH_3)_3FeF_6); ii) subjecting the titanium compound to a first thermal treatment to produce a titanium fluoride (TiF_4); iii) subjecting the titanium fluoride to a second thermal treatment with ammonia water (NH_4OH) in an oxidizing atmosphere to produce titania (TiO_2); and iv) sintering the titania to prepare anatase-type titania or rutile-type titania, wherein the NH_3 and HF gases generated in the steps ii) and iii) are collected and recirculated to the step i).

Description

Technical field [0001] The invention relates to a preparation method and a preparation device of titanium dioxide with excellent process efficiency and productivity and environmental protection. Background technique [0002] Titanium Dioxide (TiO 2 ) Is a molecule formed by the combination of transition metal titanium atom and oxygen atom, with a molecular weight of 79.866g / mol. Such titanium dioxide has stable physical and chemical properties, with a refractive index above 2.5, which is even greater than that of diamond with the highest refractive index among natural materials. When the refractive index is high, the amount of light emitted to the outside from a medium with a low refractive index in the optical material is large. Therefore, in the optical waveguide type, the size of the optical waveguide core or the thickness of the optical lens can be reduced. In addition, when high refractive index particles are dispersed in a polymer medium, the ability to scatter light is ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B82Y30/00
CPCB82Y30/00C01G23/047C01P2002/72C01P2004/03C01P2004/62C01P2004/64C01P2006/62B01J6/001
Inventor 朴珉圭金炫模金种玔
Owner 莫诺利特株式会社
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