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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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 filtration and washing will seriously affect the quality of the seed crystals. dispersion
Using this method to prepare external seed crystals has the advantages of continuity and stability, but the process requires high equipment corrosion resistance and automatic control

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

Experimental program
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Effect test

Embodiment 1

[0047] To 1500mL (milliliters) 3% NaOH solution, add concentration and be 200g / L (as TiO 2 count) TiCl 4 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 it, wash it with 255g deionized water, and filter the cake according to TiO 2 The content is 50g / L beating. Add 30% (wt) HCl to the slurry at a mass ratio of acid to titanium of 0.9:1, stir thoroughly and then raise the temperature to 70°C at a rate of 1.0°C / min, and keep it warm for 30min. To this was added 500 mL of deionized water while stirring. Finally, use 3% NaOH solution to adjust the pH value of the system to 3.0, keep the temperature of the system less than or equal to 50°C, and let the obtained slurry stand for 5 hours, pour the upper clear liquid, and the lower part of the precipitation is the external hydrolysis seed crystal, which is commonly used in this field. Analytical means ...

Embodiment 2

[0050] To 1500mL 10% NH 3 ·H 2 Adding concentration in O is 300g / L (as TiO 2 count) TiCl 4 Aqueous solution, the pH value of the system after neutralization is 4.5, and the temperature of the system shall not exceed 60°C. After neutralizing the precipitate and filtering it, wash it with 850g deionized water, and filter the cake according to TiO 2 The content is 60g / L beating. Add 60% (wt) HNO to the slurry according to the acid-titanium mass ratio of 0.9:1 3 , after fully stirring, the temperature was raised to 75°C at a rate of 2.0°C / min, and kept for 40 minutes. To this was added 825 mL of deionized water while stirring. Finally with 3% NH 3 ·H 2 O solution adjusts the pH value of the system to 6.0, keeps the system temperature less than or equal to 50°C, and puts the obtained slurry for 6 hours, pours the upper clear liquid, and the lower part of the precipitate is the external hydrolysis seed, and its TiO 2 The content is 40g / L.

[0051] Through XRD analysis, the...

Embodiment 3

[0053] Add concentration to 1500mL 5% NaOH and be 360g / L (as TiO 2 count) TiCl 4 Aqueous solution, the pH value of the system after neutralization is 5.0, and the temperature of the system is kept less than or equal to 60°C. After neutralizing the precipitate and filtering it, wash it with 1000g deionized water, and filter the cake according to TiO 2 The content is 80g / L beating. Add 35% (wt) HCl to the slurry at a mass ratio of acid to titanium of 0.5:1, stir thoroughly and then raise the temperature to 80°C at a rate of 3.0°C / min, and keep it warm for 30min. 1400 mL of deionized water was added thereto while stirring. Finally, use 5% NaOH solution to adjust the pH value of the system to 5.0, keep the temperature of the system less than or equal to 50°C, and let the obtained slurry stand for 6 hours, pour the upper clear liquid, and the lower part of the precipitate is the external hydrolysis seed, the TiO 2 The content is 45g / L.

[0054] Through XRD analysis, the rutile...

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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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