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Method for preparing titanium dioxide composite material with fine silica flour

A technology of composite materials and micro-silica fume, applied in the direction of fibrous fillers, etc., can solve the problems of late start of micro-silica fume and insufficient attention to the recovery of micro-silica fume, and achieve the effect of excellent performance, fine particle size and large processing capacity

Inactive Publication Date: 2008-10-29
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application research and recycling of micro-silica fume started late in China, and most ferrosilicon production enterprises did not pay enough attention to the recycling of micro-silica fume.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In order to prepare the titanium dioxide composite material with core-shell structure by adopting micro-silica powder, the present invention adopts the following technical scheme:

[0017] (1) Soak microsilica powder in 10% (v / v) sulfuric acid solution at room temperature for 7 hours, filter, wash with water, and remove impurities;

[0018] (2) Put microsilica powder into 200g / L (take TiO 2 meter), the acid ratio F is in the titanium sulfate solution of 1.6, the solid-liquid ratio is 100g microsilica: 500ml titanium sulfate solution, stir;

[0019] (3) Add cetyltrimethylammonium bromide of 1wt% silica fume quality to the slurry, and stir evenly;

[0020] (4) Heating to 100°C, adding 2wt% TiO 2 Seed crystal, hydrolysis reaction for 4 hours, aging for 2 hours;

[0021] (5) After the product is filtered and washed, it is dried at 120°C, calcined at 750°C for 4 hours, and dispersed by a disperser to obtain a titanium dioxide composite material with core-shell structure c...

Embodiment 2

[0023] In order to prepare the titanium dioxide composite material with core-shell structure by adopting micro-silica powder, the present invention adopts the following technical scheme:

[0024] (1) Soak microsilica powder in 20% (v / v) sulfuric acid solution at room temperature for 5 hours, filter, wash with water, and remove impurities;

[0025] (2) Put microsilica powder into 70g / L (take TiO 2 In the titanium sulfate solution that acid ratio F is 1.8, solid-liquid ratio is 50g microsilica: 500ml titanium sulfate solution, stir;

[0026] (3) urea and citric acid of 1wt% silica fume quality are added in the slurry according to the mass ratio of 1:1, and stir evenly;

[0027] (4) Heating to 90°C, adding 2wt% TiO 2 Seed crystal, hydrolysis reaction for 5 hours, aging for 1 hour;

[0028] (5) After the product is filtered and washed, it is dried at 100°C, calcined at 800°C for 3 hours, and dispersed by a disperser to obtain a titanium dioxide composite material with core-shel...

Embodiment 3

[0030] The method for preparing a titanium dioxide composite material with a core-shell structure by using microsilica powder comprises the following steps:

[0031] (1) Soak microsilica powder in 5% (v / v) sulfuric acid solution at room temperature for 10 hours, filter, wash with water, and remove impurities;

[0032] (2) Put microsilica powder into 150g / L (take TiO 2 meter), the acid ratio F is in the titanium sulfate solution of 1.7, the solid-liquid ratio is 200g microsilica: 500ml titanium sulfate solution, stir;

[0033] (3) CTAB and DBS of 5wt% microsilica fume quality are added in the slurry according to the mass ratio of 1:1, and stir evenly;

[0034] (4) Heating to 100°C, adding 2% TiO 2 Seed crystal, hydrolysis reaction for 4 hours, aging for 2 hours;

[0035] (5) After the product is filtered and washed, it is dried at 100°C, calcined at 700°C for 5 hours, and dispersed by a disperser to obtain a titanium dioxide composite material with core-shell structure chara...

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Abstract

The invention discloses a method for preparing titanium white composite material with micro silicon powder, which belongs to the field of solid waste recycling. In the method, the titanium white composite material with a nuclear-shell structure is prepared by the following steps: activating the micro silicon powder, removing impurity, dispersing, regulating surface charges and cladding titanium dioxide on the surface. The mass ratio of the TiO2 in composite particles is 2 to 25 percent; the coverage rate of the composite particles is 70 to 95 percent; the particle diameter of the TiO2 crystal particle in the cladding layer of the composite particles is 5 to 35nm. The method is characterized by controllable particle structure and high surface coverage rate. Compared with sulfate process titanium dioxide, the titanium white composite material prepared by the method greatly saves the using amount of titanium liquid and reduces the discharging amount of wastes; besides, the method also has the advantages of simple technique, large handling capacity and little pollution, etc.

Description

technical field [0001] The invention belongs to the field of solid waste reuse, specifically, the surface of micro silicon powder is coated with TiO after activation and the action of additives. 2 A method of preparing titanium dioxide composite material with micro-silicon powder. Background technique [0002] Micro-silica fume, also known as silica fume or micro-silica, is the dust recovered from flue gas in the smelting of metal silicon or ferrosilicon and other alloys. The average particle size of micro silica fume is 0.15-0.20μm, and the specific surface area is 15000-20000m 2 / kg. Its main component is silicon dioxide, the content is generally 80-92%, and the impurity components include sodium oxide, calcium oxide, magnesium oxide, iron oxide, aluminum oxide and activated carbon. The ore composition, smelting process, and the operation of the dust collection system will all cause composition fluctuations. Silicon dioxide in microsilica powder is an amorphous substan...

Claims

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Application Information

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IPC IPC(8): C04B20/10C09C1/28C04B35/628
Inventor 刘晓华
Owner INNER MONGOLIA UNIV OF TECH
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