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Bleaching method of metatitanic acid in titanium dioxide production by sulfuric acid method

A technology of metatitanic acid and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of dangerous operation process, increased preparation workload, complicated preparation process, etc. High tinting strength and good dispersibility

Active Publication Date: 2014-02-05
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of trivalent titanium solution requires additional equipment and increased preparation workload. At the same time, the preparation process is complicated, the energy consumption is high during preparation, the acid consumption is large, the cost is high, and the operation process is dangerous.

Method used

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  • Bleaching method of metatitanic acid in titanium dioxide production by sulfuric acid method
  • Bleaching method of metatitanic acid in titanium dioxide production by sulfuric acid method
  • Bleaching method of metatitanic acid in titanium dioxide production by sulfuric acid method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Add water-washed qualified metatitanic acid and water into the enamel reaction pot heated by a jacket with stirring, and the trace iron impurities of metatitanic acid are represented by Fe 2 o 3 The content is 0.010%, stir and adjust the content of TiO in the metatitanic acid slurry 2 to 235g / L, then add a certain amount of industrial sulfuric acid to make the sulfuric acid concentration of the metatitanic acid slurry 35g / L, and heat it to 40°C with steam to dissolve ferric hydroxide into ferric sulfate solution;

[0040] Step 2. Press EDTA-2Na / Fe 3+ The molar ratio is 4:1. Weigh the complexing agent EDTA-2Na and add water to make a solution. Add it to the metatitanic acid slurry in batches while stirring, and continue heating to keep the temperature at 40°C for 1.5h. The ferric sulfate reacts completely with the complex EDTA-2Na to generate the corresponding ferric complex;

[0041] Step 3. Cool the metatitanic acid slurry after complexation and bleaching to...

Embodiment 2

[0046] Step 1. Add water-washed qualified metatitanic acid and water into the enamel reaction pot heated by a jacket with stirring, and the trace iron impurities of metatitanic acid are represented by Fe 2 o 3 The content is 0.008%, stir and adjust the content of TiO in the metatitanic acid slurry 2 to 245g / L, then add a certain amount of industrial sulfuric acid to make the sulfuric acid concentration of the metatitanic acid slurry 45g / L, and heat it to 45°C with steam to dissolve ferric hydroxide into ferric sulfate solution;

[0047] Step 2. Press EDTA-2Na / Fe 3+ The molar ratio is 3:1. Weigh the complexing agent EDTA-2Na and add water to make a solution. Add it to the metatitanic acid slurry in batches while stirring, and continue heating to keep the temperature at 45°C for 1h to make the sulfuric acid Ferric reacts completely with the complex EDTA-2Na to generate the corresponding ferric complex;

[0048] Step 3. Cool the metatitanic acid slurry after complexation and b...

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Abstract

The invention relates to the production field of titanium dioxide and particularly relates to a bleaching method of metatitanic acid in titanium dioxide production by a sulfuric acid method. The bleaching method comprises the following steps: a step I of adding metatitanic acid which is qualified by water-washing and contains Fe<3+> impurities into a reaction pan, and adding industrial sulfuric acid after adding water and uniformly stirring; a step II of adding EDTA (Ethylene Diamine Tetraacetic Acid)-2Na into the metatitanic acid sizing agent of the step I, and keeping the temperature in the reaction pan between 40 DEG C and 45 DEG C; a step III of cooling the metatitanic acid sizing agent obtained in the step II, vacuum-filtering and water-washing. The invention provides a bleaching method of metatitanic acid in titanium dioxide production by a sulfuric acid method, which is simple in process, easy to realize, little in sulfuric acid dosage, low in operating environment, short in bleaching time, free from residue pollution and good in bleaching effect.

Description

technical field [0001] The invention relates to the production field of titanium dioxide, in particular to a bleaching method for producing metatitanic acid in titanium dioxide by a sulfuric acid method. Background technique [0002] At present, the bleaching methods of metatitanic acid in the production of titanium dioxide by sulfuric acid method mainly include zinc powder bleaching, aluminum powder bleaching, trivalent titanium bleaching, electric bleaching, and in the metatitanic acid slurry, first add ionic surfactant, then add metal A method in which the powder is used as a reducing agent for bleaching. In industry, two methods of aluminum powder bleaching and trivalent titanium bleaching are often used. Among them, the bleaching of trivalent titanium is better, the reason is that compared with zinc powder or aluminum powder bleaching, trivalent titanium solution bleaching has the advantages of less sulfuric acid, less reducing agent, low operating temperature, short b...

Claims

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Application Information

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IPC IPC(8): C01G23/04C01G23/08
Inventor 黄桂永王晔军
Owner CNMC GUANGXI PGMA
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