Method for preparing additional hydrolyzing seed crystal

A technology of seed crystal and aqueous solution, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of affecting the dispersion of seed crystals, poor quality of seed crystals, and affecting the quality of seed crystals, and achieves easy control, simple process, and corrosion resistance. small effect

Active Publication Date: 2010-04-28
四川金雅汇科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are two problems affecting the quality of the seed crystals in this process: first, the peptized slurry contains a large amount of NaCl, which makes the quality of the obtained seed crystals poor; second, the dispersion of the seed crystals after filtr

Method used

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  • Method for preparing additional hydrolyzing seed crystal
  • Method for preparing additional hydrolyzing seed crystal
  • Method for preparing additional hydrolyzing seed crystal

Examples

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Example Embodiment

[0046] Example 1

[0047] To 1500mL (ml) 3% NaOH solution was added a concentration of 200g / L (with TiO 2 Meter) TiCl 4 In aqueous solution, the pH value of the system after neutralization is 4.0 while keeping the system temperature not exceeding 60°C. After neutralizing the precipitate and filtering, wash with 255g deionized water, the filter cake is TiO 2 The content is 50g / L beating. The slurry was added with 30% (wt) HCl at a mass ratio of titanium oxide of 0.9:1, fully stirred and then heated to 70°C at a rate of 1.0°C / min, and kept for 30 minutes. Add 500 mL of deionized water to it while stirring. Finally, use 3% NaOH solution to adjust the pH of the system to 3.0, keep the system temperature less than or equal to 50°C, and let the resulting slurry stand for 5 hours, pour the upper clear liquid, and the lower precipitation is the additional hydrolysis seed crystal, which is commonly used in the field Analysis methods (such as chemical analysis method determination or acc...

Example Embodiment

[0049] Example 2

[0050] To 1500mL 10% NH 3 ·H 2 The concentration of O is 300g / L (with TiO 2 Meter) TiCl 4 In aqueous solution, the pH value of the system after neutralization is 4.5, and the temperature of the system should not exceed 60°C. After neutralizing the precipitate and filtering, wash with 850g deionized water, the filter cake is TiO 2 The content is 60g / L beating. The slurry is added with 60% (wt) HNO at a mass ratio of titanium oxide of 0.9:1 3 , After fully stirring, the temperature is increased to 75°C at a rate of 2.0°C / min, and the temperature is kept for 40 minutes. While stirring, 825 mL of deionized water was added thereto. Finally use 3% NH 3 ·H 2 Adjust the pH of the system with O solution to 6.0, keep the system temperature less than or equal to 50°C, and let the resulting slurry stand for 6 hours, pour the upper clear liquid, and the lower precipitation is the additional hydrolysis seed crystal, its TiO 2 The content is 40g / L.

[0051] According to XRD a...

Example Embodiment

[0052] Example 3

[0053] Add 360g / L (with TiO 2 Meter) TiCl 4 Aqueous solution, the pH of the system after neutralization is 5.0, and the temperature of the system is maintained at 60°C or less. After neutralizing the precipitate and filtering, wash with 1000g deionized water, the filter cake is TiO 2 The content is 80g / L beating. The slurry was added with 35% (wt) HCl according to the titanium oxide mass ratio of 0.5:1, and after thorough stirring, the temperature was raised to 80°C at a rate of 3.0°C / min, and the temperature was kept for 30 minutes. While stirring, 1400 mL of deionized water was added thereto. Finally, adjust the pH of the system to 5.0 with 5% NaOH solution, keep the system temperature less than or equal to 50°C, and let the obtained slurry stand for 6 hours, pour the upper clear liquid, and the lower precipitation is the additional hydrolysis seed crystal, its TiO 2 The content is 45g / L.

[0054] According to XRD analysis, the rutile content of the obtained ...

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Abstract

The invention discloses a method for preparing an additional hydrolyzing seed crystal. The method for preparing the additional hydrolyzing seed crystal comprises the following steps: neutralizing an aqueous TiCl4 solution by alkali liquid, filtering, washing, pulping, dissolving with acid, curing, neutralizing, depositing and the like. The method for preparing the additional hydrolyzing seed crystal has simple process, easy control, high rutile content of the seed crystal and stable quality, and the obtained rutile seed crystal can be used for producing the common pigment of titanium white.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing an external hydrolysis seed crystal used in the production process of producing titanium dioxide by a sulfuric acid method. Background technique [0002] At present, the production of titanium dioxide mostly adopts the sulfuric acid process, and the hydrolysis of titanium solution is one of the extremely important processes in this process. Generally, the titanium liquid is hydrolyzed by the autogenous seed crystal hydrolysis process or the external seed crystal hydrolysis process at atmospheric pressure. Compared with the self-generated seed crystal hydrolysis process, the external seed crystal atmospheric pressure hydrolysis process has the advantages of simple hydrolysis operation, stable seed crystal quality, little quality fluctuation between product batches, and low requirements for the concentration of the hydrolyzed titanium solution. Seed hydrolys...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 杜剑桥陈新红胡鸿飞马维平罗志强李礼程晓哲
Owner 四川金雅汇科技有限公司
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