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A kind of production method of pure titanium powder and low-sulfur titanium dioxide for catalyst

A production method, titanium dioxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of short service life of catalysts, poor denitrification and ammonia removal effects, large particle size of titanium dioxide, etc., to achieve corrosion The effect of reducing, high yield, and stable quality

Active Publication Date: 2019-03-29
GUANGXI JINMAO TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Throughout the existing methods of producing titanium dioxide as a denitrification catalyst, there are generally defects such as high production cost, poor denitrification and ammonia removal effect, large particle size of titanium dioxide, and short service life of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] After washing qualified metatitanic acid, the concentration was adjusted to 200g / L, neutralized with 20% ammonia water, and the pH reached 8.5 after neutralization. During the neutralization process, the flow rate of ammonia water was controlled to ensure that the neutralization process was maintained for 1 hour, and a circulation pump was used to force circulation and stirring during the neutralization process. After the neutralization is completed, the material is heated up to 73° C., the heating rate is maintained at 1° C. / min, and the temperature is kept for 1 hour. Then, the slurry is pressed dry through a filter press to make the water content of the filter cake 45%.

[0033] After the cake is removed, the filter cake is crushed and then enters the rotary kiln for drying and calcination. Rotary kiln diameter * length = 2.8m*55m, keep the feed rate at 2.5 tons / h, control the temperature at the tail of the rotary kiln at 305°C, at the head of the kiln at 500°C, and...

Embodiment 2

[0035] After washing qualified metatitanic acid, adjust the concentration to 180g / L, neutralize with 18% ammonia water, and reach pH8 after neutralization. During the neutralization process, the flow rate of ammonia water was controlled to ensure that the neutralization process was maintained for 1 hour, and a circulation pump was used to force circulation and stirring during the neutralization process. After the neutralization is completed, heat the material to 70°C, keep the heating rate at 1°C / min, and heat-preserve for 1 hour. Then, the slurry is pressed dry through a filter press to make the water content of the filter cake 45%.

[0036] After the cake is removed, the filter cake is crushed and then enters the rotary kiln for drying and calcination. Rotary kiln diameter * length = 2.8m*55m, keep the feed rate at 2.5 tons / h, control the temperature at the tail of the rotary kiln at 300°C, at the head of the kiln at 495°C, and at the high temperature zone at 550°C. Mainta...

Embodiment 3

[0038] After washing qualified metatitanic acid, the concentration was adjusted to 190g / L, and neutralized with 19% ammonia water to reach pH 8.5 after neutralization. During the neutralization process, the flow rate of ammonia water was controlled to ensure that the neutralization process was maintained for 1 hour, and a circulation pump was used to force circulation and stirring during the neutralization process. After the neutralization is completed, the material is heated up to 73° C., the heating rate is maintained at 1° C. / min, and the temperature is kept for 1 hour. Then, the slurry is pressed dry through a filter press to make the water content of the filter cake 45%.

[0039] After the cake is removed, the filter cake is crushed and then enters the rotary kiln for drying and calcination. Rotary kiln diameter * length = 2.8m*55m, keep the feed rate at 2.5 tons / h, control the temperature at the tail of the rotary kiln at 303°C, at the head of the kiln at 500°C, and at ...

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PUM

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Abstract

The invention provides a new production process of titanium white powder and low-sulfur titanium white powderfor a denitrification catalyst. The production process comprises the following steps: after obtaining competently washed metatitanic acid, neutralizing with ammonia water, heating materials to 70-75 DEG C, and curing for 1 hour while keeping the temperature; dry-pressing slurry through a filter press, removing filter cakes, crushing the filter cakes, and drying and calcining in a rotary kiln; and then, discharging, cooling, conveying to a storage bin, and pulverizing through a micron pulverizer to obtain the pure titanium powder finished product for a nano catalyst. Preferably, after completing the step of curing while keeping the temperature, the low-sulfur catalytic titanium white powder can be obtained by adding a step of washing with deionized water and keeping the subsequent process flow unchanged, and the sulfur content is less than 0.4%.

Description

technical field [0001] The application relates to a production method of titanium dioxide used as a catalyst, belonging to the field of inorganic chemistry. Background technique [0002] At present, the process of producing titanium dioxide is basically three steps: acid hydrolysis of ilmenite - hydrolysis of titanyl sulfate - rotary kiln calcination. Its reaction process is as follows: [0003] Acid hydrolysis of ilmenite: [0004] FeTiO 3 (FeO·TiO 2 )+2H 2 SO 4 →TiOSO 4 +FeSO 4 +2H 2 o [0005] Hydrolysis of titanyl sulfate: [0006] TiOSO 4 +2H 2 O→H 2 TiO 3 ↓+H 2 SO 4 [0007] Rotary kiln calcination: [0008] TiO 2 ·xH 2 O·ySO 3 →TiO 2 +xH 2 O↑+ySO 3 ↑ [0009] In the prior art, the metatitanic acid is usually hydrolyzed to obtain the metatitanic acid, which is directly press-filtered, dehydrated, dried, and then enters the calcination stage, and other reprocessing of the metatitanic acid is seldom performed before calcination. The relevant tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06
CPCC01G23/0532
Inventor 柴春旺
Owner GUANGXI JINMAO TITANIUM
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