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Method for improving whiteness of titanium dioxide by adjusting granularity

A technology of titanium dioxide and whiteness, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem of low whiteness of titanium dioxide products, achieve good hue and gloss, good dehydration and desulfurization effects, and stable internal changes Effect

Inactive Publication Date: 2020-01-14
XIANGYANG LOMON TITANIUM IND CO LTD
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Problems solved by technology

[0004] In view of the poor control of the particle size of titanium dioxide particles in the process of producing titanium dioxide in the prior art, resulting in low whiteness of titanium dioxide products, the present invention provides a method for improving the whiteness of titanium dioxide by adjusting the particle size, Its purpose is to obtain a titanium dioxide product with a suitable particle size through the parameter improvement of seed crystal addition and calcination temperature control, thereby improving the whiteness of the titanium dioxide product

Method used

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  • Method for improving whiteness of titanium dioxide by adjusting granularity

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Embodiment

[0021] A method for improving the whiteness of titanium dioxide by adjusting particle size, comprising the steps of:

[0022] (1) Pulverization: pulverizing ilmenite to form titanium ore powder;

[0023] (2) Acid hydrolysis: Use concentrated sulfuric acid to decompose ilmenite to make a black titanium solution containing soluble sulfate of titanium; in order to reduce the ferric iron in the black titanium solution to bivalent, add excess metal iron powder;

[0024] (3) Sedimentation: After the acid hydrolysis and leaching reduction in the previous step, a flocculant is added to settle the insoluble impurities;

[0025] (4) Thermal filtration: take the clear liquid above the settling tank, remove the suspended solids by a plate and frame filter press, and obtain clarified titanium liquid;

[0026] (5) Crystallization: the ferrous ion crystals in the titanium liquid are separated by vacuum crystallization or freeze crystallization;

[0027] (6) ferrous separation: the sulfate...

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Abstract

The invention belongs to the technical field of titanium dioxide production, and particularly relates to a method for improving whiteness of titanium dioxide by adjusting granularity. In the prior art, the particle size of titanium dioxide particles is not well controlled in a titanium dioxide production process, so that the whiteness of the titanium dioxide product is not high. Based on the problem in the prior art, the method of the invention comprises: crushing, acidolysis, sedimentation, hot filtration, crystallization, ferrous separation, hydrolysis, primary water washing, bleaching, secondary water washing, salt treatment, pre-kiln filter pressing, calcination, intermediate crushing, coating, tertiary water washing, drying and jet milling, wherein in the bleaching step, a calcined seed crystal with a fraction content of 1.5-2.5% into a slurry based on the Ti content calculated as TiO2 in the slurry. The method the invention is used for producing high-whiteness titanium dioxide.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to a method for improving the whiteness of titanium dioxide by adjusting particle size. Background technique [0002] Color is formed by substances absorbing different wavelengths of visible light to different degrees. Sunlight is composed of many light waves with different wavelengths, and each wavelength of light has its own specific color. When the light of various colors is combined, it becomes white. [0003] The shape, size and particle size distribution of titanium dioxide particles will affect the whiteness of titanium dioxide. The particle shape of titanium dioxide requires a smooth profile without edges and corners, because an angular surface will reduce the reflection of light. In addition, the particle size should be controlled within a reasonable range. When the particle has a higher light-scattering ability, its color appears whiter. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G23/08
CPCC01G23/08C01P2004/62C01P2006/62C01P2006/63C01P2006/64
Inventor 王国锋唐臣成鞠浩卢慧军曾小林
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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