Method for coating titanium dioxide by using chloride by-product hydrochloric acid

A technology for by-producing hydrochloric acid and titanium dioxide is applied in chemical instruments and methods, dyeing low-molecular-weight organic compounds treatment, inorganic pigment treatment, etc. Competition and other issues, to achieve the effect of improving chalking resistance, reducing photochemical activity, and improving chalking resistance

Active Publication Date: 2016-09-21
YIBIN TIANYUAN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-quality titanium dioxide mainly depends on imports. Due to the blockade of foreign core technologies, the rutile conversion rate of titanium dioxide produced by domestic titanium dioxide enterprises

Method used

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  • Method for coating titanium dioxide by using chloride by-product hydrochloric acid

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Example Embodiment

[0026] Example 1

[0027] (1) Dilute the crude hydrochloric acid with pure water to a mass concentration of 5% to 10% for use;

[0028] (2) To the titanium dioxide suspension with a concentration of 10wt%, add 0.02% of the titanium dioxide powder mass of sodium hexametaphosphate, adjust the pH to 8 with sodium hydroxide, and stir for 2 hours to obtain a titanium dioxide slurry;

[0029] (3). Add hydrochloric acid to the titanium dioxide slurry obtained in step (2) to adjust the pH to 9, raise the temperature to 60°C, then slowly add zirconium sulfate, which accounts for 0.5% of the weight of the titanium dioxide powder, and then mature for 30 minutes , Adjust the pH to 7 again with hydrochloric acid, and then mature for 50 minutes;

[0030] (4). In the mixed powder slurry obtained in step (3), heat up to 70°C, add sodium silicate (with SiO 2 Calculated) is 0.5% of the mass of the titanium dioxide powder to obtain a mixed slurry, adjust the pH to 7.5 with hydrochloric acid, and let the...

Example Embodiment

[0035] Example 2

[0036] (1) Dilute the crude hydrochloric acid with pure water to a mass concentration of 5% to 10% for use;

[0037] (2) To a titanium dioxide suspension with a concentration of 20 wt%, add 0.2% of the titanium dioxide powder mass of sodium hexametaphosphate, adjust the pH to 10 with sodium hydroxide, and stir for 3 hours to obtain a titanium dioxide slurry;

[0038] (3) In the titanium dioxide slurry obtained in step (2), the temperature is raised to 80°C, hydrochloric acid is added to adjust the pH to 8, and then zirconium oxychloride is slowly added. The added amount of zirconium oxychloride accounts for the mass of the titanium dioxide powder 1%, then mature for 60 minutes, adjust the pH to 8 again with hydrochloric acid, and then mature for 60 minutes;

[0039] (4). Cool the mixed slurry obtained in the above step (3) to 70℃, and add sodium metasilicate (with SiO 2 (Calculated) is 3% of the mass of the titanium dioxide powder, adjust the pH to 8.2 with hydrochl...

Example Embodiment

[0044] Example 3

[0045] (1) Dilute the crude hydrochloric acid with pure water to a mass concentration of 5% to 10% for use;

[0046] (2) To the titanium dioxide suspension with a concentration of 30wt%, add 0.3% of the titanium dioxide powder mass of sodium hexametaphosphate, adjust the pH to 12 with sodium hydroxide, and stir for 4 hours to obtain a titanium dioxide slurry;

[0047] (3). To the titanium dioxide slurry obtained in step (2), heat up to 85°C, add hydrochloric acid to adjust the pH to 9, and then slowly add zirconium chloride, the amount of zirconium chloride added accounts for 2% of the mass of the titanium dioxide powder , Then mature for 30-100min, adjust the pH to 9 with hydrochloric acid again, and mature for 90min;

[0048] (4). In the mixed slurry obtained in the above step (3), the temperature is reduced to 70°C, and the amount of sodium silicate added (in SiO 2 (Calculated) is 2% of the mass of the titanium dioxide powder, adjust the pH to 8.6 with hydrochlor...

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Abstract

The invention discloses a method for coating titanium dioxide by using chloride by-product hydrochloric acid. The method comprises the steps of removing impurities of coarse hydrochloric acid for later use, wherein the coarse hydrochloric acid is recycled by washing chlorinated tail gas with water; inorganically coating the titanium dioxide by using zircon salt, silicon salt and aluminum salt, and then coating by using an organic coating agent to obtain a coated titanium dioxide product with good quality. According to the method for coating the titanium dioxide, the acid used by the method is the coarse hydrochloric acid recycled by washing chlorinated tail gas with water, and an inorganic and organic composite coating process is adopted, so that the hydrophilia, pulverization resistance, lightening power and color retention of the titanium dioxide are greatly improved; furthermore, the wetting property, dispersity and covering power of the titanium dioxide in a dispersion medium are improved.

Description

technical field [0001] The invention relates to a preparation method of coated titanium dioxide, in particular to a method in which hydrochloric acid, a by-product of chlorination, is used for coating titanium dioxide. Background technique [0002] The scientific name of titanium dioxide is titanium dioxide, which is considered to be a white pigment with the best performance in the world. It has high hiding power, weather resistance, and decolorization power. Fine chemical industries such as rubber, ceramics, cosmetics, food and medicine. At present, there are two main methods for producing titanium dioxide: sulfuric acid method and chlorination method. [0003] The sulfuric acid method is to produce titanous sulfate by acidolysis reaction of ferrotitanium powder and concentrated sulfuric acid, which is hydrolyzed to generate metatitanic acid, and then calcined and crushed to obtain titanium dioxide products. The advantage of this process is that it can use ilmenite and su...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/08
CPCC09C1/3661C09C1/3669C09C1/3692C09C3/006C09C3/063C09C3/08
Inventor 陈洪颜华雷丹万立
Owner YIBIN TIANYUAN GRP CO LTD
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