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Hydrolysis method for preparing high-brightness rutile titanium white from low-concentration titaniferous solution

A rutile titanium dioxide, high-brightness technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of increased process and cost, limited output of titanium liquid, high steam consumption, etc., to improve detergency, reduce bottom The amount of water used, the effect of optimizing the hydrolysis process

Active Publication Date: 2013-06-05
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a method for preparing high-brightness titanium dioxide by sulfuric acid method, such as patent CN101851435, but all of them adopt various post-processing procedures, which increase the procedure and cost
[0003]The general self-seed dilution hydrolysis method, because the amount of bottom water is large, generally at 1: (3.5~4), requires a high concentration of titanium solution, which is mentioned in many patents It is required to be above 220g / L (or even 250-260 g / L). In this way, during the entire titanium dioxide production process, the concentration post has become one of the production bottlenecks, especially in winter when the temperature is low, the concentration speed is slow, and the steam consumption is high. The output of titanium liquid is limited, which will eventually affect the entire production capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preheat 1500ml of concentrated titanium solution with a concentration of 190g / L to 90°C, add it to 250ml of bottom water at a temperature of 90°C within 15 minutes, heat and stir while adding the titanium solution, and heat the system to the first boiling within 20 minutes. Keep boiling slightly until the system is steel gray, stop heating and reduce the stirring speed for about 25 minutes, then continue heating and stirring until the second boiling, maintain the system in a slight boiling state for 25 minutes; slowly add dilution water to the system, and maintain the slight boiling of the whole system state until the end of hydrolysis, the hydrolysis reaction time is 3.0h, and the hydrolyzed material is obtained. The hydrolyzed material was subjected to suction filtration washing, Ti 3+ Reduction bleaching, addition of calcined seed crystals, secondary suction filtration and washing, addition of K, P, and Al salt treatment agents, programmed temperature rise muffle fur...

Embodiment 2

[0021] Preheat 1500ml of concentrated titanium solution with a concentration of 195g / L to 93°C, add it to 300ml of bottom water at a temperature of 93°C within 18 minutes, heat and stir while adding the titanium solution, and heat the system to the first time within 25 minutes. Boil, keep boiling until the system is steel gray, stop heating and reduce the stirring speed for about 30 minutes, then continue heating and stirring until the second boiling, maintain the system in a slightly boiling state for 30 minutes; slowly add dilution water to the system, and maintain the whole system Slight boiling state until the end of hydrolysis, the hydrolysis reaction time is 3.0h, and the hydrolyzed material is obtained. Adopt the same step as the embodiment to carry out the suction filtration washing of the hydrolyzed material once, Ti 3+ Reduction bleaching, addition of calcined seed crystals, secondary suction filtration and washing, addition of K, P, and Al salt treatment agents, pro...

Embodiment 3

[0023] Preheat 1500ml of concentrated titanium solution with a concentration of 205g / L to 96°C, add it into 330ml of bottom water with a temperature of 98°C within 25 minutes, heat and stir while adding the titanium solution, and heat the system to the first boiling in 23 minutes , keep slightly boiling until the system is steel gray, stop heating and reduce the stirring speed for about 35 minutes, then continue heating and stirring until the second boiling, maintain the system in a slightly boiling state for 35 minutes; slowly add dilution water to the system, and maintain the whole system slightly Boiling state until the end of hydrolysis, the hydrolysis reaction time is 3.5h, to obtain the hydrolyzed material. The hydrolyzed material was subjected to suction filtration washing, Ti 3+ Reduction bleaching, addition of calcined seed crystals, secondary suction filtration and washing, addition of K, P, and Al salt treatment agents, programmed temperature rise muffle furnace cal...

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PUM

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Abstract

Disclosed is a hydrolysis process for preparing high brightness rutile titanium dioxide from a low concentration titanium solution, comprising pre-heating substrate water and a titanium solution having a concentration of 190-215 g / L at a volume ratio of 1 : (4.5-6), mixing, heating the mixture system until boiling, and maintaining in a slight boiling state, stopping the steam when the system becomes steely grey, settling for a period of time, continuing heating and stirring until a second boiling, maintaining the system at a slight boiling state for a period of time, supplementing diluting water to the system slowly, and maintaining the whole system at a slight boiling state until the hydrolysis is complete. The process can reduce the concentration of the titanium solution, reduce the amount of substrate water, save the concentrated steam, improve the washing effect and product quality, and reduce production costs.

Description

technical field [0001] The invention relates to a hydrolysis method for preparing high-brightness rutile titanium dioxide by hydrolyzing low-concentration titanium liquid self-generated seed crystals in a production process for producing titanium dioxide by a sulfuric acid method. Background technique [0002] In the production process of titanium dioxide produced by sulfuric acid method, the main factor determining the quality of titanium dioxide products is the choice of hydrolysis process. The quality of hydrolysis not only affects the economics of industrial production, but also has a great relationship with the quality of the final product. Compared with chlorination-processed rutile titanium dioxide, there is a large gap in properties such as whiteness and brightness. The main reason is that there are more colored impurities in sulfuric acid-processed titanium dioxide, and the particle size, distribution and morphology There are also large gaps. There is a method for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/053
Inventor 林发蓉陈刚蔡平雄邓伯松朱全芳
Owner SICHUAN LOMON TITANIUM IND CO LTD