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Production method using chlorination process by-product for inorganic coating of titanium dioxide

A technology of inorganic coating and production method, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of high cost of cerium salt, improved light resistance of titanium dioxide, and unfavorable long-term operation of titanium dioxide manufacturers. Achieve low cost, solve light fastness and whiteness problems

Inactive Publication Date: 2018-09-28
HENAN BILLIONS NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned coating materials cannot greatly improve the light resistance of titanium dioxide in specific fields; in the prior art, water-soluble cerium salts are added in the post-treatment process of titanium dioxide, and the use of Ce 4+ / C 3+ The redox electromotive force is higher than that of Ti 4+ / Ti 3+ The redox electromotive force of the Ce 4+ Ti exists 4+ The principle that it will not be reduced ensures the light resistance of titanium dioxide, but the cost of cerium salt is extremely high, which is not conducive to the long-term operation of titanium dioxide manufacturers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Sand mill the kiln products of sulfuric acid process titanium dioxide qualified for calcining, and then import the slurry with qualified particle size into the coating tank, and control the concentration of the slurry to 250g / L (based on TiO 2 meter), while raising the temperature to 40°C; adding 0.15%TiCl within 40min 4 (with TiO 2 count), while adding 3%NaH 2 PO 4 and Na 3 PO 4 , Homogenized for 60min. Heating to 80°C, using NaAlO 2 Adjust pH to 6.8-7.0, 1.0% H 3 PO 4 with 2%NaAlO 2 Parallel flow, keep pH=6.0-7.5, 90min to finish adding, homogenize for 45min. 4% NaAlO 2 (in Al 2 o 3 count) and H 2 SO 4 Maintain pH=6.0-7.5 in parallel flow, finish adding in 150 minutes, homogenize for 45 minutes; use dilute H 2 SO 4 Adjust the pH value of the slurry to 5.3-5.5. Homogenized for 1 hour, washed three times, flash steamed and steamed to obtain the finished product.

Embodiment 2

[0020] Sand mill the kiln products of sulfuric acid process titanium dioxide qualified for calcining, and then introduce the slurry with qualified particle size of the sand mill into the coating tank, and control the concentration of the slurry to 300g / L (based on TiO 2 meter), while raising the temperature to 40°C; adding 0.4%TiCl within 50min 4 (with TiO 2 count), while adding 2%NaH 2 PO 4 and Na 3 PO 4 , Homogenized for 60min. Heating to 80°C, using NaAlO 2 Adjust pH to 6.8-7.0, 2.0% H 3 PO 4 with 2%NaAlO 2 Parallel flow, keep pH=6.0-7.5, finish adding in 60 minutes, homogenize for 45 minutes. 3% NaAlO 2 (in Al 2 o 3 count) and H 2 SO 4 Maintain pH=6.0-7.5 in parallel flow, finish adding in 120 minutes, homogenize for 45 minutes; use dilute H 2 SO 4 Adjust the pH value of the slurry to 5.3-5.5. Homogenized for 1.5h, washed three times, flash steamed and steamed to get the finished product.

Embodiment 3

[0022] Sand mill the kiln products of sulfuric acid process titanium dioxide that is qualified for calcining, and then introduce the slurry with a qualified particle size of the sand mill into the coating tank, and control the concentration of the slurry to 350g / L (based on TiO 2 meter), while raising the temperature to 40°C; adding 0.6%TiCl within 50min 4 (with TiO 2 count), while adding 4%NaH 2 PO 4 and Na 3 PO 4 , Homogenized for 60min. Heating to 80°C, using NaAlO 2 Adjust pH to 6.8-7.0, 3.0% H 3 PO 4 with 2%NaAlO 2 Parallel flow, keep pH=6.0-7.5, finish adding in 60 minutes, homogenize for 45 minutes. 6% NaAlO 2 (in Al 2 o 3 count) and H 2 SO 4 Maintain pH=6.0-7.5 in parallel flow, finish adding in 120 minutes, homogenize for 45 minutes; use dilute H 2 SO 4 Adjust the pH value of the slurry to 5.3-5.5. Homogenized for 1.5h, washed three times, flash steamed and steamed to get the finished product.

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Abstract

The invention relates to a production method using a chlorination process by-product for inorganic coating of titanium dioxide. The method comprises the following steps that 1, a kiln product of titanium dioxide by a sulfuric acid method which is qualified after calcination is subjected to sanding, then sanding slurry with qualified sanding grain sizes is introduced into a coating pot, the sandingslurry concentration is controlled at 250-350 g / L by TiO2, and meanwhile the temperature is elevated to 40 DEG C; 2, TiCl4 is added, and meanwhile, NaH2PO4 and Na3PO4 are added; 3, heating is conducted to elevate the temperature to 80 DEG C, an aluminium salt solution is added to adjust the pH to 6.8-7.0, then H3PO4 and an aluminium salt solution are added in a parallel-flow mode, and it is maintained that pH=6.0-7.5; 4, an aluminium salt solution and H2SO4 are added in a parallel-flow mode, and it is maintained that pH=6.0-7.5; 5, dilute H2SO4 is used for adjusting the slurry pH value to 5.3-5.5; 6, after third-washing, flash evaporation and fluid energy milling, a finished product is obtained. By means of the method, the titanium dioxide by the sulfuric acid method with the light resistance close to that of a cerium salt coated finished product can be obtained, and the cost is very low.

Description

technical field [0001] The invention specifically relates to a production method in which a by-product of a chlorination process is used for an inorganic coating of titanium dioxide, and belongs to the technical field of titanium dioxide production. Background technique [0002] At present, titanium dioxide used in domestic papermaking is generally anatase titanium dioxide obtained by sulfuric acid method, which has the problems of low whiteness and poor light resistance. In order to improve the weather resistance and chemical stability of sulfuric acid process titanium dioxide, improve TiO 2 Dispersion in various media, usually TiO 2 For surface preparation. Inorganic surface treatment is on TiO 2 A uniform colorless or white inorganic oxide film is formed on the particle surface to block TiO 2 The photoactivation point improves weather resistance. Inorganic surface treatment materials generally use SiO 2 (Silica), Al 2 0 3 (alumina), ZrO (zirconia), ZnO (zinc oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC01P2006/60C09C1/3661C09C3/063
Inventor 陈建立王丽萍曹青喜李永海周文静苏光明
Owner HENAN BILLIONS NEW MATERIAL CO LTD
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