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Method for regulating and controlling particle size of hydrolyzed seed crystal

A technology of crystal seed and particle size, applied in the field of titanium dioxide, can solve the problems of small particle size variation range, no production method for the particle size of hydrolyzed seeds, etc., and achieve the effect of large particle size range.

Pending Publication Date: 2022-08-05
SICHUAN LOMON TITANIUM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] And the hydrolyzed seed crystals obtained in the preparation process of the hydrolyzed seed crystals in the prior art have a small particle size variation range, and there is no controllable production method for the particle size of the hydrolyzed seed crystals

Method used

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  • Method for regulating and controlling particle size of hydrolyzed seed crystal
  • Method for regulating and controlling particle size of hydrolyzed seed crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take the titanium solution concentrated to 160g / L, divide it into two parts, preheat to 80°C and 70°C respectively, add 300ml of sodium hydroxide solution with a concentration of 120g / L to the flask, preheat to 100°C for 10 minutes Quickly add a titanium solution with a temperature of 80 °C, stir rapidly until the pH of the system = 2.5, and ripen for 20 minutes, continue to add a titanium solution at a temperature of 70 °C, and stir until the pH of the system = 2.5, at 70 °C, ripen for 40 minutes; Hydrolyzed seeds.

Embodiment 2

[0035] Take the titanium solution concentrated to 170g / L, divide it into two parts, preheat to 90°C and 75°C respectively, then add 300ml of sodium hydroxide solution with a concentration of 110g / L to the flask, preheat to 95°C for 8min Quickly add a titanium solution with a temperature of 90°C, stir rapidly until the pH of the system = 3.0, and ripen for 30 minutes, continue to add a titanium solution at a temperature of 75°C, and stir until the pH of the system = 2.0, and at 80 °C, ripen for 30 minutes; Hydrolyzed seeds.

Embodiment 3

[0037] Take the titanium solution concentrated to 180g / L, divide it into two parts, preheat to 95°C and 60°C respectively, then add 300ml of sodium hydroxide solution with a concentration of 100g / L to the flask, preheat to 90°C for 6 min Quickly add a titanium solution with a temperature of 95°C, stir rapidly until the pH of the system = 3.5, and ripen for 10 minutes, continue to add a titanium solution at a temperature of 60°C, and stir until the pH of the system = 1.7, and at 85 °C, ripen for 20 minutes; Hydrolyzed seeds.

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Abstract

The invention relates to the technical field of titanium dioxide, and discloses a method for regulating and controlling the particle size of a hydrolyzed seed crystal, which comprises the following steps: dividing 160-250g / L of titanium liquid into two parts, namely a titanium liquid A and a titanium liquid B; the titaniferous solution A and the titaniferous solution B are preheated respectively, and the temperature of the preheated titaniferous solution A is different from that of the preheated titaniferous solution B; the preheated titaniferous solution A is added into the preheated alkali liquor, the concentration of the alkali liquor is 40-150 g / L, a system A is obtained through stirring, and the pH of the system A is controlled; adding preheated titanium liquid B after primary curing, stirring to obtain a system B, and controlling the pH value of the system B; and then secondary curing is carried out, such that hydrolysis seed crystals are obtained. According to the method, the particle size of the hydrolyzed seed crystal precursor is changed by regulating and controlling the temperature and the speed when the titanium solution and the alkali solution are neutralized and adopting different temperature conditions and pH conditions, so that the particle size of the hydrolyzed seed crystal is regulated and controlled; the particle size range of the obtained hydrolyzed seed crystal is 2-30 nm, and the particle size range is large.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide, in particular to a method for regulating the particle size of hydrolysis seeds. Background technique [0002] In the production process of titanium dioxide by sulfuric acid method, the hydrolysis process of titanium liquid is involved; in the hydrolysis process of titanium liquid, hydrolysis seeds will be added. There are many preparation methods for hydrolyzed seeds. With the advancement of technology, the preparation method of hydrolyzed seeds has been upgraded from the original self-generated seed process to the external seed process; the external seeds are from titanium tetrachloride and titanium oxysulfate as raw materials to low concentration. Titanium liquid as raw material. So far, most of the production enterprises have adopted the high-concentration and hydrolyzed seed process with high-concentration titanium liquid as raw material. However, in the relevant patent documents i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00
CPCC01G23/053B82Y40/00C01P2004/64
Inventor 林发蓉吴彭森熊怀忠周春勇和奔流许萍
Owner SICHUAN LOMON TITANIUM IND CO LTD
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