Calcination crystallization method of nanometer TiO2/porous mineral composite material

A technology of porous minerals and composite materials, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of difficult large-scale production, unstable product quality, long calcination time, etc., to save Effects of time and energy consumption

Inactive Publication Date: 2015-09-02
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing nano-TiO 2 / The calcination and crystallization of porous mineral composite materials adopt discontinuous static calcination method, not only the calcination time is long, the energy consumption is high, but also the powder material is heated unevenly, the product quality is unstable, and it is difficult to scale production

Method used

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  • Calcination crystallization method of nanometer TiO2/porous mineral composite material
  • Calcination crystallization method of nanometer TiO2/porous mineral composite material
  • Calcination crystallization method of nanometer TiO2/porous mineral composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Φ550×9600mm cylindrical rotary calciner, cylinder diameter 550mm, length 9600mm, cylinder wall thickness 12mm, cylinder main material is 309S; electric heating power 75kW; rotary kiln inclination: 0°~2° range Adjustable; cylinder speed: 1 ~ 3r / min range adjustable; main motor transmission power: 2.2kW, screw feeding, power of dehumidification fan: 2.0kW; support method: second gear support roller; transmission method: chain transmission , equipped with a manual device; the temperature rise of the outer surface of the furnace is <45°C; temperature control method: automatic temperature control by intelligent instruments.

[0017] Diatomaceous earth loaded nano-TiO after loading is completed and dried 2 Composite powder material, bulk density 0.32g / ml, water content: adsorption water ≤ 5%, structural water 15.5%; the material stays in the 650°C heating zone for 1h from the feed, and 1.5h in the 650°C high temperature zone. Stay in the cooling zone at 650-80°C f...

Embodiment 2

[0018] Embodiment 2: adopt the cylinder type rotary calciner of the same specification as embodiment 1.

[0019] After the loading is completed and dried, the nano-titanium dioxide composite powder material loaded with diatomite filter aid has a bulk density of 0.35g / ml and a water content of the material: adsorption water ≤ 4%, structural water 15.0%; the material is heated from feeding to 600°C Zone residence time 1h, residence time in 600°C high temperature zone for 2h, stay in 600-80°C cooling zone for 0.75h; accumulative calcination time is 3.75h; continuous feed and output, feed rate 21kg / h; calcined and crystallized finished product The output is 17kg / h. Calcined and crystallized nano-TiO 2 Nano-TiO / Diatomite Filter Aid Composite 2 The crystal forms and grain sizes are listed in Table 1.

Embodiment 3

[0020] Embodiment 3: adopt the cylinder type rotary calciner of the same specification as embodiment 1.

[0021] Attapulgite-loaded nano-titanium dioxide composite powder material after the loading is completed and dried, the bulk density is 0.40g / ml, the water content of the material: adsorption water ≤ 5%, structural water 15.0%; the residence time of the material from feeding to 600°C heating zone 1h, stay in the high temperature zone at 600°C for 2h, stay in the cooling zone at 600-80°C for 0.75h; the cumulative calcination time is 3.75h; continuous feeding and output, the feeding amount is 22kg / h; the output of calcined and crystallized products is 18kg / h h. Calcined and crystallized nano-TiO 2 Nano-TiO / Attapulgite Composite Materials 2 The crystal forms and grain sizes are listed in Table 1.

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Abstract

The invention discloses a calcination crystallization method of a nanometer TiO2/porous mineral composite material. The method is characterized in that a cylinder type rotary calcining furnace is used for calcining and crystallizing the nanometer TiO2/porous mineral composite material. The temperature in the cylinder type rotary calcining furnace is divided into three sections: a warming region, a high-temperature calcining region and a cooling region, wherein the temperature at the warming region is normal temperature to 650 DEG C, the temperature at the high-temperature calcining region is 550-650 DEG C, and the temperature at the cooling region is 650-80 DEG C. The nanometer TiO2/porous mineral composite material is uniformly and continuously fed into the cylinder type rotary calcining furnace after being prepared through a hydrolysis precipitation method and dried, the composite material orderly passes through the warming region, the high-temperature calcining region and the cooling region, wherein the composite material is remained at the warming region for 0.5-1.5h, remained at the high-temperature calcining region for 1.5-3.0h, and remained at the cooling region for 0.5-1.5h, and then discharged. Compared with a static calcination method, the continuous production is realized through the adoption of the method disclosed by the invention, the nanometer TiO2 is uniformly crystallized, the obtained product is stable in quality, the calcining time is shortened, the energy source is saved, and the operation and the maintenance are convenient.

Description

technical field [0001] The present invention relates to a kind of nano TiO 2 / Calcination and crystallization method of porous mineral composite materials, which belongs to the deep processing of non-metallic mineral materials and TiO 2 Photocatalytic technology field. Background technique [0002] Nano-TiO 2 It is a clean, environmentally friendly and energy-saving new material with new environmental protection functions, and has a good application prospect in the field of environmental protection. However, pure nano-TiO 2 Difficult to prepare, high production cost, and inconvenient to recycle, therefore, nano-TiO 2 / Porous mineral composites have become a research hotspot in this field. Nano-TiO 2 The key preparation process of / porous mineral composite material is: (1) hydrated nano-titanium dioxide particles are mixed with natural or Precipitation loading on the surface of artificially synthesized porous non-metallic mineral powder particles, the titanium dioxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/12B01J20/18B01J20/20B01J20/28B01J20/30B01J21/06B01J21/08B01J21/16
Inventor 郑水林孙志明王利剑
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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