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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 is low, and the comprehensive performance of titanium dioxide is poor. It cannot compete with multinational companies such as the United States in terms of quality and price. Titanium dioxide competition,

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0028] (2), to the titanium dioxide suspension that concentration is 10wt%, add the sodium hexametaphosphate of 0.02% of titanium dioxide powder mass, adjust pH to 8 with sodium hydroxide, stir again 2h, obtain titanium dioxide slurry;

[0029] (3), add hydrochloric acid to the titanium dioxide slurry obtained in step (2) to adjust the pH to 9, heat up to 60°C, then slowly add zirconium sulfate, the addition of zirconium sulfate accounts for 0.5% of the mass of the titanium dioxide powder, and then ripen for 30min , adjust the pH to 7 with hydrochloric acid again, and then ripen for 50 minutes;

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

Embodiment 2

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

[0037] (2), to the titanium dioxide suspension that concentration is 20wt%, add the sodium hexametaphosphate of 0.2% of titanium dioxide powder mass, adjust pH to 10 with sodium hydroxide, stir again 3h, obtain titanium dioxide slurry;

[0038] (3), in the titanium dioxide slurry obtained in step (2), heat up to 80°C, add hydrochloric acid to adjust the pH to 8, then slowly add zirconium oxychloride, the addition of zirconium oxychloride accounts for 1 / 2 of the mass of titanium dioxide powder 1%, then ripen for 60 minutes, adjust the pH to 8 with hydrochloric acid again, and then ripen for 60 minutes;

[0039] (4), lower the temperature of the mixed slurry obtained in the above step (3) to 70°C, add sodium metasilicate (using SiO 2 Calculate) is 3% of the titanium dioxide powder mass, adjust the pH value to 8.2 with hydrochloric acid, let the slurry st...

Embodiment 3

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

[0046] (2), to the titanium dioxide suspension that concentration is 30wt%, add the sodium hexametaphosphate of 0.3% of titanium dioxide powder mass, adjust pH to 12 with sodium hydroxide, stir again 4h, obtain titanium dioxide slurry;

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

[0048] (4), in the mixed slurry obtained in the above step (3), the temperature is lowered to 70°C, and the addition amount of sodium silicate (based on SiO 2 Calculated) is 2% of the mass of the titanium dioxide powder, the pH value is adjusted to 8.6 w...

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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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