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Preparation method of titanium dioxide treated with high zinc salt

A technology of salt treatment and titanium dioxide, which is applied in the field of preparation of titanium dioxide treated with high zinc salt to achieve the effects of good whiteness, reduced calcination temperature, high weather resistance and powder resistance

Active Publication Date: 2017-01-11
江苏镇钛化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to achieve better weather resistance of the product through high zinc salt treatment at a relatively low calcination temperature, and at the same time make the product have better color indicators and particle softness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Get the metatitanic acid that has been added with rutile calcined seed crystals after bleaching and rinsed to make slurry with deionized water, and the slurry concentration is 450g / l of titanium dioxide content;

[0031] (2) Potassium hydroxide is added, and its addition is calculated as 0.25% of the titanium dioxide content in terms of potassium oxide;

[0032] (3) adding phosphoric acid, its addition is calculated as 0.30% of titanium dioxide content with phosphorus pentoxide;

[0033] (4) Adding zinc oxide, its addition is calculated as 0.60% of the titanium dioxide content based on zinc oxide;

[0034] (5) Stir at 60 rpm for more than one hour, and filter the slurry.

[0035] (6) Calcining the filter cake at 925° C. for one hour, dehydration, desulfurization, crystal transformation, and grain growth until the rutile crystal transformation rate reaches over 99%.

Embodiment 2

[0037] (1) Get the metatitanic acid that has been added with rutile calcined seed crystals after bleaching and rinsed to make slurry with deionized water, and the slurry concentration is 450g / l of titanium dioxide content;

[0038] (2) Potassium hydroxide is added, and its addition is calculated as 0.50% of the titanium dioxide content in terms of potassium oxide;

[0039] (3) adding phosphoric acid, its addition is calculated as 0.40% of titanium dioxide content with phosphorus pentoxide;

[0040] (4) adding zinc oxide, the amount of which is calculated as 1.0% of the titanium dioxide content based on zinc oxide;

[0041] (5) Stir at 60 rpm for more than one hour, and filter the slurry.

[0042] (6) Calcining the filter cake at 950° C. for one hour, dehydration, desulfurization, crystal transformation, and grain growth until the rutile crystal transformation rate reaches over 99%.

Embodiment 3

[0044] (1) Get the metatitanic acid that has been added with rutile calcined seed crystals after bleaching and rinsed to make slurry with deionized water, and the slurry concentration is 450g / l of titanium dioxide content;

[0045] (2) Potassium hydroxide is added, and its addition is calculated as 0.25% of the titanium dioxide content in terms of potassium oxide;

[0046] (3) adding phosphoric acid, its addition is calculated as 0.30% of titanium dioxide content with phosphorus pentoxide;

[0047] (4) Adding zinc oxide, its addition is calculated as 1.3% of the titanium dioxide content with zinc oxide;

[0048] (5) Stir at 60 rpm for more than one hour, and filter the slurry.

[0049] (6) Calcining the filter cake at 925° C. for one hour, dehydration, desulfurization, crystal transformation, and grain growth until the rutile crystal transformation rate reaches over 99%.

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Abstract

The invention discloses a preparation method for treating titanium white by high zinc salt, and belongs to the field of titanium white powder production. The preparation method includes the process steps of mineral decomposition, titanium liquor purification, hydrolysis, washing, bleaching, rinsing, salt treatment, calcining, crushing and post-treatment. The preparation method is characterized in that bleached metatitanic acid added with rutile calcining seeds and qualified in rinsing is slurried by deionized water, and then salt treatment agents comprising crystalline phase control agents such as phosphoric acid or phosphate, potassium salt, the zinc salt and zircon salt are added. The high zinc salt is used for salt treatment and serves as a crystal accelerator and a crystal stabilizer for accelerating rutile crystal transformation, transformation rate is increased, the calcining temperature of the highest transformation rate is reduced, and weather resistance and pulverization resistance of products are improved. When crystal acceleration and crystal stabilization are enhanced, dosage of the phosphoric acid or phosphate is increased, the zircon salt is added, rutile crystal grain growth is regularly adjusted, and product performances are more superior.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide treated with high zinc salt, especially adopts crystal phase control to improve weather resistance and whiteness of the product, and belongs to the field of titanium dioxide production. Background technique [0002] The metatitanic acid obtained by the hydrolysis of titanium liquid by sulfuric acid method is amorphous. Although the product can be completely converted into rutile crystal form by calcination at high temperature (below 1050°C) for a long time, the crystallization process will cause serious sintering and crystal lattice. There are many defects, the crystal grains are too large and hard, and the pigment performance of the product is extremely poor. In addition, the high temperature often deoxidizes the lattice, making the product gray. Therefore, in production, it is necessary to add some rutile promoters and crystal form regulators to metatitanic acid, so that TiO2 can grow ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 陈俊潘巧珍邱健亭刘俊周莉
Owner 江苏镇钛化工有限公司
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