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Titanium dioxide production method

A production method and titanium dioxide technology, applied in the field of titanium dioxide, can solve the problems affecting the water consumption per ton of titanium dioxide and the production capacity per unit time, the uneven particle size distribution of hydrolyzed metatitanic acid, and the low washing efficiency of hydrolyzed metatitanic acid, etc., to achieve Good economic and social benefits, improved washing efficiency, and excellent pigment performance

Active Publication Date: 2014-10-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN101555038A "Method for Preparing Titanium Dioxide by Hydrolysis" proposes: while the concentrated titanium solution is discharged and added to the bottom water, sodium hydroxide or potassium hydroxide solution or solid is continuously and uniformly added to the hydrolysis mixture as a regulator; titanium solution After the unloading is completed, metatitanic acid is obtained by hydrolysis, and titanium dioxide is obtained through subsequent processes; this method is a method of acid-base neutralization and forced hydrolysis, and its hydrolysis rate can reach 96.3-97.5, but using this method to prepare titanium dioxide The particle size distribution of the obtained hydrolyzed metatitanic acid is not uniform (forced hydrolysis nucleation, particle growth is difficult to control), and therefore the washing efficiency of the hydrolyzed metatitanic acid is low (generally, it takes 100-150 minutes for acid washing, and 150-150 minutes for water washing). 210min), thus affecting the water consumption per ton of titanium dioxide and the production capacity per unit time, thereby affecting the production cost of titanium dioxide

Method used

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Experimental program
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Effect test

Embodiment 1

[0059] Preheat 1000ml titanium liquid to 94°C, under stirring condition, mix sodium polycarboxylate and TiO in titanium liquid 2 Add DIS to the titanium solution with a mass ratio of 0.5%, heat 250ml of desalted water in the hydrolysis pot to boiling, then add the mixture of titanium solution and sodium polycarboxylate into the hydrolysis pot at a uniform speed within 18 minutes, the feeding process Maintain the temperature of the hydrolysis system at 96°C; raise the temperature of the hydrolysis system to the first boiling point (about 105°C) after feeding is completed, heating time is 9 minutes, and the heating rate is 1.0°C / min; keep the system in a slightly boiling state, and stop heating after determining the gray point of the system And stirring, aging 40min.

[0060] After the aging is completed, turn on the stirring again and start heating, raise the temperature of the system to the second boiling point (about 106°C), the heating time is 11min, and the heating rate is ...

Embodiment 2

[0064] Preheat 1000ml of titanium liquid to 96°C, under stirring condition, according to the ratio of sodium hexametaphosphate and TiO in titanium liquid 2 Add sodium hexametaphosphate into the titanium liquid at a mass ratio of 0.9%, heat 250ml of desalted water in the hydrolysis pot to 98°C, and then add the mixture of titanium liquid and sodium hexametaphosphate to the hydrolysis pot at a uniform speed within 16 minutes During the feeding process, the temperature of the hydrolysis system was maintained at 96°C. After the feeding is completed, keep stirring at 96°C for 5 minutes, then raise the temperature of the hydrolysis system to the first boiling point (about 105°C), heating time is 9 minutes, and the heating rate is 1.0°C / min; keep the system in a slightly boiling state, and stop after judging the gray point of the system Heating and stirring, ripening 20min.

[0065] After the aging is completed, turn on the stirring again and start heating, raise the temperature of ...

Embodiment 3

[0069] Preheat 1000ml of titanium solution to 98°C, heat 250ml of desalted water to 94°C in a hydrolysis pot, under stirring conditions, mix the dispersant and TiO in the titanium solution 2 Add the dispersant to the bottom water with a mass ratio of 0.9%, wherein the dispersant is a mixture of sodium polycarboxylate, sodium silicate and sodium hexametaphosphate with a mass ratio of 1:1:1, and then add the titanium solution at a uniform speed within 20 minutes In the hydrolysis pot, the feeding process maintains the temperature of the hydrolysis system at 96°C. After the feeding is completed, keep stirring at 96°C for 10 minutes, then raise the temperature of the hydrolysis system to the first boiling point (about 105°C), heating time is 9 minutes, and the heating rate is 1.0°C / min; keep the system in a slightly boiling state, and stop after determining the gray point of the system Heating and stirring, ripening 0min.

[0070] After the aging is completed, turn on the stirrin...

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Abstract

The invention relates to a titanium dioxide production method and belongs to the field of titanium dioxide. The titanium dioxide production method produces titanium dioxide through a sulfuric acid method. A hydrolysis method comprises the following steps of a, adding dispersant, wherein the dispersant is at least one of sodium polycarboxylate, sodium silicate and sodium hexametaphosphate, wherein the mass ratio between the dispersant and TiO2 in titaniferous solution is 0.2-2%; b, performing heating and curing including heating the hydrolysis system obtained in the step a to a first boiling point, when the hydrolysis system is steel grey, namely, is at a graying point, stopping heating and mixing and performing first curing for 0-40 minutes; c, performing second curing including, after finishing the first curing, heating the hydrolysis system to a second boiling point and maintaining a micro-boiling state; d, supplementing desalted water into the hydrolysis system and maintain the micro-boiling state of the system until hydrolysis reaction is completed. The titanium dioxide production method can improve the hydrolysis rate and meanwhile improve the washing efficiency of metatitanic acid, thereby reducing the cost of sulfuric acid method titanium dioxide production.

Description

technical field [0001] The invention relates to a production method for preparing titanium dioxide, which belongs to the field of titanium dioxide. Background technique [0002] At present, the industrial production of pigment titanium dioxide at home and abroad mainly adopts the sulfuric acid method and the chlorination method. In China, the sulfuric acid method is still the main method, which is divided into spontaneous seed crystal thermal hydrolysis and external seed crystal thermal hydrolysis. One of the key factors that determine the hydrolysis rate, the washing efficiency of metatitanic acid and the quality of pigment titanium dioxide are the hydrolysis conditions and hydrolysis operation, the quantity, quality and dispersion of the seed crystals formed in the initial stage of hydrolysis in the autogenous seed crystal hydrolysis process The situation plays a decisive role in the metatitanic acid structure, particle size and distribution obtained by the subsequent hydr...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 路瑞芳任亚平吴健春杜剑桥
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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