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Preparation method of composite titanium dioxide

A technology for compounding titanium dioxide and metatitanic acid, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problem of high cost, low surface coating rate of calcium carbonate particles, and large coating amount of titanium dioxide. and other issues to achieve low production costs, good market prospects, and good performance

Active Publication Date: 2013-07-10
黑龙江越阳环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses commercial titanium dioxide as the coating agent, and there is a problem that the surface coating rate of calcium carbonate particles is not high, which affects the optical properties of the product. At the same time, the coating amount of titanium dioxide is relatively large, resulting in high cost.

Method used

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  • Preparation method of composite titanium dioxide
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  • Preparation method of composite titanium dioxide

Examples

Experimental program
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preparation example Construction

[0055] The preparation method of the composite titanium dioxide of the present invention is as follows: in the carbonization stage of the light calcium carbonate production process, adding metatitanic acid as a titanium source coating agent, adding sodium silicate as a binder and an inorganic coating agent, filtering, washing with water, Dried, crushed, that is.

[0056] Metatitanic acid is an intermediate product in the hydrolysis link in the industrial sulfuric acid titanium dioxide production process, and its cost is only 1 / 2 to 2 / 3 of commercial titanium dioxide. Titanium solution can be hydrolyzed to generate white metatitanic acid H 2 TiO 3 Precipitation, the particle size is very small, generally around tens of nanometers, the reaction equation is as follows:

[0057]

[0058] During the production of light calcium carbonate, Ca(OH) 2 with CO 2 The gas undergoes a carbonization reaction, first forming CaCO 3 The crystal nucleus, and then the crystal nucleus cont...

Embodiment 1

[0076] Example 1 Composite titanium dioxide was prepared by the method of the present invention (the content of metatitanic acid is 10%)

[0077] 1. Prepare 4L of hot water at about 70°C.

[0078] 2. Weigh 480g quicklime (CaO) and pour it into the high-speed disperser.

[0079] 3. Pour 4L of hot water at about 70°C into the disperser, and stir at a low speed (1000-2000r / min) for 30 minutes.

[0080] 4. Pour out all the lime slurry in the disperser, first sieve it with a sieve of about 100 mesh, and then sieve it with a sieve of about 200-325 mesh to obtain Ca(OH) 2 Concentration of about 12.3% Ca(OH) 2 The slurry is about 4L.

[0081] 5. Add Ca(OH) 2 Pour the slurry into a disperser, and age for 10 hours under slight stirring. The stirring speed is based on the principle of not settling. Before carbonization, add about 500ml of water to replenish the volume to 4L.

[0082] 6. Take 162g of metatitanic acid (in the form of H 2 TiO 3 meter), added to the high-speed disper...

Embodiment 2

[0088] Example 2 Composite titanium dioxide was prepared by the method of the present invention (the content of metatitanic acid is 20%)

[0089] The 1st-5 step is the same as Example 1; the amount of metatitanic acid in the 6th step is changed to 324g, and the sodium hexametaphosphate addition is changed to 2g, and the others are unchanged; the 7th-10 step is the same as Example 1, but in the 10th step In the step, the drying temperature is 200°C; in the performance test of the 11th step, the sample number is 2, and the others remain unchanged.

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Abstract

The invention relates to a preparation method of composite titanium dioxide and belongs to the chemical field. In order to solve the technical problems, the invention provides the preparation method of the composite titanium dioxide. The preparation method of the composite titanium dioxide comprises the following steps of: adding metatitanic acid as a titanium source covering agent during a carbonization stage in a light calcium carbonate production process; adding sodium silicate as a bonding agent and an inorganic covering agent, filtering, washing with water, drying and crushing to obtain the composite titanium dioxide. The composite titanium dioxide prepared by the preparation method disclosed by the invention has better performances including whiteness, weather resistance, covering power, oil absorption amount and the like, and has lower production cost which is only 1 / 4 of that of the common anatase type titanium dioxide, and therefore, the preparation method can be extensively applied to the industries including paint, papermaking and the like, and has better market prospect.

Description

technical field [0001] The invention relates to a production method of composite titanium dioxide, which belongs to the field of chemical industry. Background technique [0002] As a white pigment, titanium dioxide has high hiding power, high finish, high whiteness and strong weather resistance, but its application is limited due to the much higher production cost than other white pigments and the increasing shortage of titanium ore resources. How to reduce the production cost of titanium dioxide has become an urgent research topic. [0003] The pigment performance of titanium dioxide particles is reflected by optical properties, which mainly depend on TiO 2 The surface properties of the particles, therefore, TiO 2 Particle cores contribute little to optical performance. If a cheap and easy-to-obtain white material can be used to replace the inner core, the unit cost of titanium dioxide will be greatly reduced. Composite titanium dioxide uses cheap non-metallic minerals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
Inventor 邹建新
Owner 黑龙江越阳环保科技有限公司