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Production method of granularity-controllable titanium dioxide

A technology of titanium dioxide and production method, which is applied in the production field of titanium dioxide with controllable particle size, can solve the problems of limited control range and high cost of aluminum trichloride, and achieve the effects of improving crystal conversion rate, low cost and simple operation.

Active Publication Date: 2014-03-05
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of aluminum trichloride in this method is not only costly, but also too low or too high a dosage will directly affect the crystal conversion rate and optical properties of titanium dioxide; the halides of alkali metals are used as ionic agents to improve the particle size distribution and dispersibility of titanium dioxide , to prevent the particles from coalescing into large aggregates, which can also play a role in refining the grains to a certain extent, but the control range is limited, so different reaction mechanisms are required to achieve the control of the particle size of titanium dioxide

Method used

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Examples

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Effect test

Embodiment 1

[0020] Under the pressure of 200kPa, titanium tetrachloride is preheated to 490°C by titanium tetrachloride preheater, and oxygen is preheated by oxygen preheater to 900°C, respectively introduced into the high temperature oxidation reactor; burn with toluene The heat generated preheats the hot oxygen to 1800°C in the high temperature oxidation reactor for the second time, so that titanium tetrachloride and oxygen undergo a gas-phase oxidation reaction, and at the same time add aluminum trichloride, potassium chloride and deionized water, of which four The mass ratios of titanium chloride to aluminum trichloride, potassium chloride and deionized water are 1000:15, 1000:3 and 1000:6 respectively (the amount of deionized water is controlled by a metering pump), such as figure 2 Shown, the addition mode of aluminum trichloride is to react in the aluminum trichloride generator with aluminum powder and chlorine, and the aluminum trichloride of generation and titanium tetrachloride ...

Embodiment 2

[0022] Under the pressure of 800kPa, preheat titanium tetrachloride to 550°C and oxygen to 750°C, and introduce them into the high temperature oxidation reactor respectively; use the heat generated by the combustion of toluene to heat the oxygen in the high temperature oxidation reactor twice Preheat to 1500°C to make gas-phase oxidation reaction between titanium tetrachloride and oxygen, and add aluminum trichloride, potassium chloride and deionized water at the same time, among them, titanium tetrachloride and aluminum trichloride, potassium chloride, deionized water The mass ratio of ionized water is 1000:2.5, 1000:0.015, 1000:0.095 (the amount of deionized water is controlled by a metering pump), such as figure 1 Shown, the addition mode of aluminum trichloride is to react in the aluminum trichloride generator with aluminum powder and chlorine, and the aluminum trichloride of generation and titanium tetrachloride airflow are jointly introduced in the oxidation reactor; The...

Embodiment 3

[0024] Under the pressure of 400kPa, preheat titanium tetrachloride to 520°C and oxygen to 760°C, and introduce them into the high temperature oxidation reactor respectively; use the heat generated by the combustion of toluene to heat the oxygen twice in the high temperature oxidation reactor Preheat to 1650°C to make gas-phase oxidation reaction between titanium tetrachloride and oxygen, and add aluminum trichloride, potassium chloride and deionized water at the same time, among them, titanium tetrachloride and aluminum trichloride, potassium chloride, deionized water The mass ratios of ionized water are 1000:10, 1000:1, and 1000:0.095 (the amount of deionized water is controlled by a metering pump), such as figure 1 Shown, the addition mode of aluminum trichloride is to react in the aluminum trichloride generator with aluminum powder and chlorine, and the aluminum trichloride of generation and titanium tetrachloride airflow are jointly introduced in the oxidation reactor; Th...

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Abstract

The invention provides a production method of granularity-controllable titanium dioxide. Titanium tetrachloride and oxygen gas are preheated under pressure of 200kPa to 800kPa and respectively led into a high temperature oxidation reactor; hot oxygen is secondarily preheated in the high temperature oxidation reactor by using heat produced during toluene combustion to enable the titanium tetrachloride and the oxygen gas to produce a gas-phase oxidation reaction, and meanwhile, aluminum chloride, potassium chloride and deionized water are added to the high temperature oxidation reactor; and a gas-solid mixture generated through the reaction is cooled and subject to gas-solid separation, and then the titanium dioxide with the granularity of 160nm to 310nm is obtained. The method has the advantages that the cost is low, the operation is simple, the granularity of the titanium dioxide can be controlled within a large range through regulating the addition amount of the deionized water in the reaction process, and the application field of pigment is widened; and the method can be widely applied to the industries of coatings, plastics, building materials, papermaking, printing, ink, chemical fiber, rubber, ceramics, and the like.

Description

technical field [0001] The invention relates to a production method of titanium dioxide with controllable particle size, in particular to a production method for controlling the particle size of titanium dioxide in a high-temperature gas phase oxidation process. Background technique [0002] In the production of titanium dioxide, titanium dioxide is mainly prepared by two processes: chloride method and sulfuric acid method. The chlorination method has gradually become the main trend of the development of the titanium dioxide industry due to its high production efficiency, advanced technology, high quality and environmental protection. Titanium dioxide is stable and is currently the best white pigment. The particle size of titanium dioxide has an important impact on its optical properties, such as: decolorization power, carbon black background (CBU), oil absorption, dispersibility, etc., so the application range of titanium dioxide with different particle sizes is also diffe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/07B82Y40/00
Inventor 齐牧王彦福臧颖波吴琼吕滨张树峰
Owner 中信钛业股份有限公司
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