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Process for preparing crystal seed used for rutile type titanium dioxide production

A technology of rutile-type titanium dioxide and calcined seed crystals, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of poor achromatic power, poor washing effect, and high impurity content, so as to improve the impurity removal effect and shorten the washing time. Time, the effect of improving the washing quality

Inactive Publication Date: 2005-03-16
湖南永利化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also because the method adopts the clarification decantation method, the required production cycle is up to 48 hours, and the production efficiency is low; the washing effect is poor, and the Na in the orthotitanic acid + and SO 4 2- High impurity content, poor decolorization power and yellowing of the product
In summary, the alkali boiling reaction conditions of this method need to be further optimized, and the washing method needs to be further improved

Method used

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  • Process for preparing crystal seed used for rutile type titanium dioxide production

Examples

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Effect test

Embodiment 1

[0011] Take the concentration as 320g / l, the Fe contained in it 2 o 3 ≤0.01%, Fe 2 o 3 ≤0.003% metatitanic acid slurry 0.938m 3 And concentration is 48% liquid caustic soda 540Kg carries out heating caustic boiling reaction with the alkali-titanium ratio of 1.8:1, controls the reaction temperature between 108~116 ℃ and matures for 120 minutes, adds ion-free dilution and hydrolysis, washes with box filter press machine To NaOH contentfigure 1 As shown, the washing time and the rutile crystal content of the obtained samples are shown in Table 1, and the product quality of rutile titanium dioxide obtained by using the calcined seed crystal is compared with the national standard GB1706-93 as shown in Table 2.

Embodiment 2

[0013] Prepare the calcined seed crystal sample for the production of rutile titanium dioxide by the method of Example 1, the difference is that the concentration of the metatitanic acid slurry is 312g / l, and the volume is 0.962m 3 , the concentration of liquid alkali is 48%, the weight is 540Kg, and the ratio of alkali to titanium is 1.8:1. The washing time and the rutile crystal content of the obtained samples are shown in Table 1.

Embodiment 3

[0015] Prepare the calcined seed crystal sample for the production of rutile titanium dioxide by the method of Example 1, the difference is that the concentration of the metatitanic acid slurry is 305g / l, and the volume is 0.984m 3 , the concentration of liquid alkali is 49%, the weight is 510Kg, and the ratio of alkali to titanium is 1.7:1. The washing time and the rutile crystal content of the obtained samples are shown in Table 1.

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Abstract

The invention discloses a process for preparing crystal seed used for rutile type titanium dioxide production which comprises the steps of alkali boiling reaction, dilution and hydrolytic decomposition, scouring edulcoration, neutralization with acids, acid solution, and cooling down, wherein the alkali-titanium ratio in the alkali boiling reaction is 1.7:1-1.9:1, and the scouring edulcoration is conducted with a press filtration mode.

Description

technical field [0001] The invention relates to a production method of rutile titanium dioxide, in particular to a preparation method of calcined seed crystals for production of rutile titanium dioxide. Background technique [0002] One of the key technologies in the sulfuric acid production process of rutile titanium dioxide lies in the preparation of the secondary seed crystal, that is, the calcined seed crystal. The calcined crystal seed is a rutile crystal accelerator for the crystal transformation of metatitanic acid during the calcination process. It can reduce the temperature required for the rutile crystal transformation, improve the color-removing power of the product, improve the particle shape of titanium dioxide during calcination, and make the particles smooth Regular, soft and not easy to sinter. [0003] The commonly used calcined seed crystal preparation process generally has the following steps: alkali boiling reaction, dilution hydrolysis, washing and impu...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 龙小兵魏电锋戴建军
Owner 湖南永利化工股份有限公司
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