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Preparation method of highly active calcined seed crystal

A calcined seed crystal, high activity technology, applied in chemical instruments and methods, inorganic chemistry, titanium dioxide, etc., can solve the problems of excessive waste and by-products, high consumption of sulfuric acid, water, and large environmental pollution, and achieve fewer lattice defects. , the effect of less sintering and simple preparation method

Active Publication Date: 2019-03-01
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the process is long, and it can only be operated intermittently, wet operation, high consumption of sulfuric acid and water, many wastes and by-products, and great environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Calcined Seed A was prepared as follows:

[0036] (1) Take water-washed qualified metatitanic acid slurry (TiO 2 =100g / L, Fe=24ppm) 1200kg is placed in the pressure vessel (stainless steel reactor), adds solid sodium hydroxide and desalinated water in the pressure vessel, controls the add-on of both to make the amount of sodium hydroxide in the slurry liquid phase The mass concentration is 2.0%, NaOH / TiO in the slurry 2 = 0.40. Then pressurize the alkali dissolution in the pressure vessel, adjust the pressure to 0.5 MPa, keep the boiling reaction for 120min, and the alkali dissolution ends.

[0037] (2) Add water to the obtained alkali-soluble slurry to dilute it and cool it to 60° C., filter the alkali-soluble slurry to obtain a filter cake.

[0038] (3) The filter cake is washed with water until NaOH=4.6g / L in the washing liquid is produced, and then water is added to beat the washed filter cake to TiO 2 =192g / L.

[0039] (4) Next, add a hydrochloric acid solutio...

Embodiment 2

[0047] Calcined Seed B was prepared as follows:

[0048] (1) Take water-washed qualified metatitanic acid slurry (TiO 2 =100g / L, Fe=24ppm) 1200kg is placed in the pressure vessel (stainless steel reactor), adds solid sodium hydroxide and desalinated water in the pressure vessel, controls the add-on of both to make the amount of sodium hydroxide in the slurry liquid phase The mass concentration is 50%, NaOH / TiO in the slurry 2 = 0.40. Then pressurize the alkali dissolution in the pressure vessel, adjust the pressure to 5MPa, keep the boiling reaction for 60min, and the alkali dissolution ends.

[0049] (2) Add water to the obtained alkali-soluble slurry to dilute it and cool it to 62° C., filter the alkali-soluble slurry to obtain a filter cake.

[0050] (3) The filter cake is washed with water to produce NaOH=2.2g / L in the washing liquid, and then water is added to beat the washed filter cake to TiO 2 =202g / L.

[0051] (4) Then add a hydrochloric acid solution with a mass...

Embodiment 3

[0059] Calcined Seed C was prepared as follows:

[0060] (1) Take water-washed qualified metatitanic acid slurry (TiO 2 =100g / L, Fe=24ppm) 1200kg is placed in the pressure vessel (stainless steel reactor), adds solid sodium hydroxide and desalinated water in the pressure vessel, controls the add-on of both to make the amount of sodium hydroxide in the slurry liquid phase The mass concentration is 10%, NaOH / TiO in the slurry 2 = 0.40. Then pressurize the alkali dissolution in the pressure vessel, adjust the pressure to 1.5 MPa, keep the boiling reaction for 90 minutes, and the alkali dissolution ends.

[0061] (2) Add water to the obtained alkali-soluble slurry to dilute it and cool it to 60° C., filter the alkali-soluble slurry to obtain a filter cake.

[0062] (3) The filter cake is washed with water to produce NaOH=1.3g / L in the washing liquid, and then water is added to beat the washed filter cake to TiO 2 =198g / L.

[0063] (4) Next, add a hydrochloric acid solution wi...

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PUM

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Abstract

The invention relates to a production process of titanium dioxide by means of a sulfuric acid method and in particular discloses a preparation method of high activity calcined seed crystals. The preparation method comprises the following steps: A, pressurizing for alkali dissolution; B, washing, C, neutralizing, and D, acid solubility. The preparation method provided by the invention has the advantages that 1) a preparation method of grain size-controllable high activity calcined seed crystals is provided; 2) a production method of a high quality titanium dioxide less in sintering, few in lattice imperfection and high in pigment performance is provided; and 3) the preparation method is simple, the production cost is not increased, and the preparation method is favorably popularized industrially.

Description

technical field [0001] The invention relates to a production process of titanium dioxide, in particular to a production method of sulfuric acid titanium dioxide. Background technique [0002] The production of titanium dioxide is mainly divided into the chloride method and the sulfuric acid method. The production of titanium dioxide by the sulfuric acid method is to produce titanous sulfate by acidolysis of titanium concentrate and concentrated sulfuric acid, which is hydrolyzed to generate metatitanic acid, and then calcined and crushed to obtain titanium dioxide. Titanium dioxide products. Its production process can be summarized as follows: [0003] (1) carry out acidolysis reaction with titanium concentrate or acid-soluble titanium slag and sulfuric acid, obtain titanyl sulfate solution; [0004] (2) hydrolyzing titanyl sulfate solution to obtain thick metatitanic acid slurry; [0005] (3) washing and salting the thick metatitanic acid slurry to obtain pretreated meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/0534
Inventor 代堂军张玉荣姚恒平朱全芳孙润发
Owner SICHUAN LOMON TITANIUM IND CO LTD
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