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Preparation method of calcined seed crystal for producing rutile titanium dioxide

A technology of rutile titanium dioxide and calcined seed crystals, applied in the directions of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of low rutileization rate of seed crystals, limited storage time, high oil absorption of the first product, and achieve rutile conversion rate. High, long storage time, simple method

Inactive Publication Date: 2017-05-31
PANZHIHUA TAIDU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to prepare rutile-type calcined seed crystals has low activity, low rutile conversion rate of the seed crystals, and high oil absorption of the initial product
Moreover, the seed crystals prepared by this method are prone to delamination and have limited storage time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The present invention is used for the preparation method of the calcined seed crystal of rutile titanium dioxide production, comprises the following steps:

[0019] a. Mix sulfuric acid and metatitanic acid, and react at 100-120°C for 0.5-1 hour to obtain titanium sulfate clear solution;

[0020] B, add alkaline solution in titanium sulfate clear solution and obtain orthotitanic acid suspension, wherein, when the pH value of orthotitanic acid suspension is 7, stop adding liquid caustic soda;

[0021] c. Filtrating the orthotitanic acid suspension, washing, and beating the filter cake to obtain orthotitanic acid slurry;

[0022] d. Add hydrochloric acid to the orthotitanic acid slurry, adjust the pH value to 2-2.5, then raise the temperature to 50-55°C, keep it warm for 10-20 minutes, then add hydrochloric acid, adjust the pH value to 1.5-1.8, heat up to boiling, and mature After 30-45 minutes, quench rapidly to obtain calcined seed crystals.

[0023] Preferably, in st...

Embodiment 1

[0031] Adopt following method to obtain calcined seed crystal:

[0032] a. Mix sulfuric acid and metatitanic acid and react at 100°C for 1 hour to obtain titanium sulfate clear liquid; titanium sulfate clear liquid contains TiO 2 The amount is 150g / L;

[0033] b. Adding a mass concentration of 40% sodium hydroxide solution into the titanium sulfate clear liquid to obtain an orthotitanic acid suspension, wherein, when the pH value of the orthotitanic acid suspension was 7, stop adding the sodium hydroxide solution ;

[0034] c. Filtrate the orthotitanic acid suspension, wash it, beat the filter cake to obtain orthotitanic acid slurry; use TiO 2 Content meter, orthotitanic acid slurry concentration is 80g / L;

[0035] d. Add hydrochloric acid to the orthotitanic acid slurry, adjust the pH value to 2, then raise the temperature to 50°C, keep it warm for 20 minutes, then add hydrochloric acid, adjust the pH value to 1.5, raise the temperature to boiling, and after aging for 45 m...

Embodiment 2

[0037] Adopt following method to obtain calcined seed crystal:

[0038] a. Mix sulfuric acid and metatitanic acid and react at 120°C for 0.5h to obtain titanium sulfate clear liquid; titanium sulfate clear liquid contains TiO 2 The amount is 200g / L;

[0039] b. Adding an ammonium hydroxide solution with a mass concentration of 50% in the titanium sulfate clear liquid to obtain an orthotitanic acid suspension, wherein, when the pH value of the orthotitanic acid suspension is 7, stop adding the ammonium hydroxide solution ;

[0040] c. Filtrate the orthotitanic acid suspension, wash it, beat the filter cake to obtain orthotitanic acid slurry; use TiO 2 Content meter, orthotitanic acid slurry concentration is 100g / L;

[0041] d. Add hydrochloric acid to the orthotitanic acid slurry, adjust the pH value to 2.5, then raise the temperature to 55°C, keep it warm for 10 minutes, then add hydrochloric acid, adjust the pH value to 1.8, raise the temperature to boiling, and after agin...

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PUM

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Abstract

The invention relates to a preparation method of a calcined seed crystal for producing rutile titanium dioxide and belongs to the technical field of production of the rutile titanium dioxide. Aiming at solving the technical problems, the invention provides the preparation method of the calcined seed crystal for producing the rutile titanium dioxide. The method comprises the following steps: a, mixing sulfuric acid with metatitanic acid; reacting at 100 DEG C to 120 DEG C for 0.5h to 1h to obtain a titanium sulfate clear solution; b, adding an alkali solution into the titanium sulfate clear solution and neutralizing to obtain titanic acid turbid liquid; c, filtering the titanic acid turbid liquid and washing; pulping a filter cake to obtain titanic acid slurry; d, adding hydrochloric acid into the titanic acid slurry and adjusting the pH (Potential of Hydrogen) value to be 2 to 2.5; raising the temperature to 50 DEG C to 55 DEG C and keeping the heat for 10min to 20min; adding the hydrochloric acid and adjusting the pH value to be 1.5 to 1.8; raising the temperature until the solution is boiled; curing for 30min to 45min; quenching to obtain the calcined seed crystal. The method provided by the invention is simple and low in cost; the conversion rate of the obtained calcined seed crystal, namely rutile, is high and the storage time is long.

Description

technical field [0001] The invention relates to a method for preparing calcined seed crystals used in the production of rutile titanium dioxide, and belongs to the technical field of rutile titanium dioxide production. Background technique [0002] Titanium dioxide (titanium dioxide) is chemically stable and does not react with most substances under normal circumstances. There are three crystallizations of titanium dioxide in nature: brookite, anatase and rutile. The brookite type is an unstable crystal form and has no industrial application value, while the anatase type titanium dioxide does not need to be coated. Therefore, the rutile type titanium dioxide is currently the best white inorganic pigment in the world and is widely used in Coatings, plastics, papermaking, printing inks, chemical fibers, rubber, ceramics, cosmetics, food additives, and pharmaceuticals. [0003] In the preparation process of titanium dioxide, the calcined seed crystal is a microcrystal with a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08
CPCC01G23/08
Inventor 米加海李关祥周彤周军
Owner PANZHIHUA TAIDU CHEM