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Method for realizing impurity removal of crude titanium tetrachloride by virtue of alkaline liquor

A technology of coarse titanium tetrachloride and silicon tetrachloride, applied in the direction of titanium halide, etc., can solve the problems of slow gravity settling rate, low production efficiency, and difficulty in removing impurities, so as to improve the efficiency of removing impurities and reduce the content of solid impurities , The effect of accelerating the sedimentation rate

Inactive Publication Date: 2014-11-26
LUOHE XINGMAO TITANIUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditionally, gravity settling is used to preliminarily remove large particles of solid impurities in crude titanium tetrachloride. However, the rate of gravity settling is very slow, the production efficiency is very low, and it is difficult to remove the trichloride dissolved in crude titanium tetrachloride. Aluminum, silicon tetrachloride and other impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for removing impurities from crude titanium tetrachloride by using lye, the lye adopts materials with the following weight composition ratio: sodium hydroxide: water = 45:55. Spray the lye into the gas-liquid mixture of crude titanium tetrachloride at 20°C according to the ratio of 1:200 (lye: crude titanium tetrachloride = 1:200), and contact the lye with titanium tetrachloride for 3 minutes After settling and solid separation, the content of aluminum trichloride and silicon tetrachloride in the crude titanium tetrachloride can be reduced by 80%, and the solid content can be reduced by 72%.

Embodiment 2

[0031] The method for removing impurities from crude titanium tetrachloride by using lye, the lye adopts materials with the following weight composition ratio: sodium hydroxide: water = 45:55. Add the lye to the liquid crude titanium tetrachloride at 100°C according to the ratio of 1:200 (lye: crude titanium tetrachloride = 1:200), make the lye and titanium tetrachloride contact for 1min, after settling, the solid After separation, the content of aluminum trichloride and silicon tetrachloride in the crude titanium tetrachloride can be reduced by 78%, and the solid content can be reduced by 76%.

Embodiment 3

[0033] The method of using lye to remove impurities from crude titanium tetrachloride The lye uses materials with the following weight composition ratio: potassium hydroxide: water = 35:65. Spray the lye into the gas-liquid mixture of crude titanium tetrachloride at 200°C according to the ratio of 1:250 (lye: crude titanium tetrachloride = 1:250), and contact the lye with titanium tetrachloride for 20 minutes. After settling and solid separation, the content of aluminum trichloride and silicon tetrachloride in the crude titanium tetrachloride can be reduced by 74%, and the solid content can be reduced by 80%.

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Abstract

The invention discloses a method for realizing impurity removal of crude titanium tetrachloride by virtue of alkaline liquor, and belongs to the technical field of chemical engineering. According to the method, the alkaline liquor may be one of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the concentration of the alkaline liquor is 30-60%; the alkaline liquor is added into crude titanium tetrachloride and adequately contacted, and solid impurities in crude titanium tetrachloride are removed after sedimentation and solid separation. The method provided by the invention is capable of effectively reducing impurities such as aluminium trichloride and silicon tetrachloride in crude titanium tetrachloride; moreover, the alkaline liquor reacts with aluminium trichloride and silicon tetrachloride to form colloidal aluminium hydroxide and sodium silicate as flocculants, so that the sedimentation speeds of other solid impurities in titanium tetrachloride is increased, and the impurity removal efficiency is effectively increased. Compared with the traditional gravity sedimentation method, the method for realizing impurity removal of crude titanium tetrachloride by virtue of the alkaline liquor is capable of increasing the impurity removal efficiency by more than 30%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for removing impurities from crude titanium tetrachloride by using lye. Background technique [0002] Titanium tetrachloride is an important intermediate product in the production of titanium dioxide by chlorination. Titanium dioxide (TiO2) is a white pigment. As an important chemical product, it has excellent optical properties and pigment properties, high whiteness, strong hiding power, high decolorization power and easy dispersion, so it is widely used in coatings, Plastics, paper, ink, rubber and other fields. The production of titanium dioxide by the chlorination method has the advantages of short process flow, large production capacity, continuous production, easy automation control, stable product quality, less waste, and low energy consumption, so it has developed rapidly in recent years. [0003] However, the crude titanium tetrachloride ...

Claims

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Application Information

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IPC IPC(8): C01G23/02
Inventor 王亚锋李俊峰张兵兵孙学习柳少军吴新李铁平李茂恩
Owner LUOHE XINGMAO TITANIUM IND
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