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
View PDF9 Cites 3 Cited by
  • 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 concent

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] The preparation method of hydrolyzed spontaneous seed crystals in the production of titanium dioxide is: adding the initial titanium solution to the bottom water and mixing to obtain spontaneous seed crystals;

[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 TiO 2 Calculate the required bottom water volume in the range of 155~175g / L;

[0033] b. Preparation of bottom water: add sulfuric acid or sodium hydroxide to the water and mix to obtain bottom water; wherein the amount of sulfuric acid or sodium hydroxide added needs to meet the following conditions: the initial titanium solution is added to the bottom water when When the added amount of the titanium solution is 3.0% to 3.5% of the total volume of the titanium solution, the total sulfuric acid concentration of the reaction system at this time is 0.6±0.02 ...

Example Embodiment

[0051] Example 1

[0052] a. Calculate the required bottom water volume: the index of the 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 was controlled at 160g / L, and the required bottom water volume was calculated.

[0053] b. Calculate the amount of sulfuric acid or sodium hydroxide added: When adding 3.5% of the total titanium liquid volume, calculate the corresponding system sulfuric acid concentration of 0.62mol / L, and weigh 0.35kg / (cubic meter of titanium liquid) ratio of sodium hydroxide , Add water to dissolve and dilute to the calculated bottom water volume, mix well to get bottom water.

[0054] c. Preheat the hydrolyzed titanium solution and the bottom water to 98°C respectively, and then add the preheated hydrolyzed titanium solution to the preheated bottom water at a uniform speed, stir and proceed according to the autogenous seed hydrol...

Example Embodiment

[0055] Example 2

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

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

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

[0059] Preheat the hydrolyzed titanium solution and the bottom water to 96°C respectively, and then add the preheated hydrolyzed titanium solution to the preheated bottom water at a uniform speed, stir and proceed according to the autogenous seed hydrolysis process, and produce titanium dioxide according to the traditional sulfuric acid method. The rutile pigment titanium dioxide is pre...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap