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A self-born crystal seed for hydrolysis in titanium dioxide production and a preparing method thereof

A technology of self-generated crystal seeds and titanium dioxide, which is applied in the direction of chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of inapplicability, poor performance of rutile pigment titanium dioxide, etc., and achieve the effect of saving concentration costs and shortening the process

Active Publication Date: 2019-01-15
攀枝花兴中钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment method of this patent is used to treat titanium liquid with higher concentration (total titanium concentration is 200-240g / L), and it is not suitable for titanium liquid with lower concentration
If this method is used to treat the hydrolyzed titanium solution with a lower concentration (total titanium concentration 160-200g / L), the performance of the obtained rutile pigment titanium dioxide is poor

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0030] The preparation method of hydrolyzed self-generated seed crystals in the production of titanium dioxide is as follows: the initial titanium liquid is added to the bottom water, mixed evenly, and the self-generated seed crystals are obtained;

[0031] Among them, the specific process parameters are:

[0032] a. Bottom water addition: according to the concentration of the initial titanium solution, the total titanium concentration of the hydrolysis system is calculated as TiO 2 The meter is controlled within the range of 155-175g / L to calculate the required bottom water volume;

[0033] b. Preparation of bottom water: add sulfuric acid or sodium hydroxide to the water, and mix well to obtain bottom water; wherein, the addition of sulfuric acid or sodium hydroxide needs to meet the following conditions: in the process of adding the initial titanium liquid to the bottom water, when When the added amount of the titanium solution is 3.0%-3.5% of the total volume of the titan...

Embodiment 1

[0052] a. Calculate the required bottom water volume: the index of hydrolyzed titanium solution is: total titanium concentration (TiO 2 Mass meter) 185.6g / L, F value 1.89. The total titanium concentration of the hydrolysis system in this experiment is controlled at 160g / L, and the required bottom water volume is calculated.

[0053] b. Calculate the addition of sulfuric acid or sodium hydroxide: when adding 3.5% of the total titanium liquid volume, the corresponding system sulfuric acid concentration is 0.62mol / L, and weigh 0.35kg / (cubic meter of titanium liquid) sodium hydroxide , add water to dissolve and dilute to the corresponding calculated volume of bottom water, and mix well to obtain bottom water.

[0054] c. Preheat the hydrolyzed titanium solution and the bottom water to 98°C respectively, then add the preheated hydrolyzed titanium solution into the preheated bottom water at a constant speed, stir, and proceed according to the self-generated crystal seed hydrolysis ...

Embodiment 2

[0056] The index of hydrolyzed titanium solution is: total titanium concentration (TiO 2 Mass meter) 180.0g / L, F value 1.78.

[0057] The total titanium concentration of the hydrolysis system in this laboratory is controlled at 163g / L, and the required bottom water volume is calculated.

[0058] When adding 3.3% of the total titanium liquid volume, corresponding to the system sulfuric acid concentration of 0.60mol / L, take by weighing 2.04kg / (cubic meter of titanium liquid) ratio of sodium hydroxide, add water to dissolve and dilute to the corresponding calculated bottom water volume, Mix well to get bottom water.

[0059] Preheat the hydrolyzed titanium solution and the bottom water to 96°C respectively, then add the preheated hydrolyzed titanium solution into the preheated bottom water at a constant speed, stir, and proceed according to the autogenous crystal seed hydrolysis process, and produce titanium dioxide according to the traditional sulfuric acid method Process to p...

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Abstract

The invention relates to a self-born crystal seed for hydrolysis in titanium dioxide production and a preparing method thereof, and belongs to the technical field of chemical engineering. The method includes adding a titanium solution into base water and fully mixing the mixture to obtain self-born crystal seeds. The amount of the base water is calculated to control the total titanium concentration, calculated based on TiO2, of a hydrolysis system to be 155-175 g / L according to the concentration of the initial titanium solution. The base water is prepared by adding sulfuric acid or sodium hydroxide into water and fully mixing the mixture. The dosage of the sulfuric acid or sodium hydroxide meets a condition that when the titanium solution is added into the base water and the amount of theadded titanium solution is 3.0-3.5% of the volume of the total titanium solution, the concentration of sulfuric acid of the whole reaction system is 0.6 + / - 0.02 mol / L. A present process for producingtitanium dioxide self-born crystal seeds through a sulfuric acid method is utilized, the base water amount for initial formation of the self-born crystal seeds and the acidity of a critical point arecontrolled to obtain hydrolysis seeds of a proper amount and proper mass, and pigment titanium dioxide with good structures and excellent performance can be prepared.

Description

technical field [0001] The invention relates to a self-generated hydrolyzed crystal seed in the production of titanium dioxide and a preparation method thereof, belonging to the technical field of chemical industry. Background technique [0002] Due to its stable physical and chemical properties, excellent optical properties, chemical inertness and high refractive index, titanium dioxide is usually used as the first choice for white pigments, and is widely used in coatings, plastics, papermaking, inks, rubber, fibers, ceramics, food additives, etc. field. At present, domestic titanium dioxide manufacturers mostly use the sulfuric acid method titanium dioxide process, among which the titanium liquid hydrolysis process and conditions are one of the key factors determining product quality. The hydrolysis process generally adopts the self-generated seed crystal thermal hydrolysis process or the external seed crystal thermal hydrolysis process. During the hydrolysis process of ...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01G23/053
CPCC01G23/047C01G23/0534
Inventor 田从学
Owner 攀枝花兴中钛业有限公司
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