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A method for removing silicon in crude titanium tetrachloride

A technology of crude titanium tetrachloride and refined titanium tetrachloride, which is applied in the direction of titanium tetrachloride and titanium halide, can solve the problems of high silicon content and lower silicon content in refined titanium tetrachloride, and achieve the reduction of silicon content, The effect of improving product quality and improving fractionation efficiency

Active Publication Date: 2017-03-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is based on solving the problem of high silicon content in refined titanium tetrachloride produced by traditional control methods, and proposes a rectification tower control method for reducing silicon content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The total silicon content (ΣSi content) in the crude titanium tetrachloride is 180ppm, the feed rate is 7.8t / h, the feed temperature is 84.5°C, the reflux ratio is 65, the tower top temperature is 129±0.6°C, and the reflux liquid temperature is 83±1.0°C, the pressure at the top of the tower is 1.2kPa, and the recovery rate of low boiling point substances at the top of the tower is 2.8% of the feed rate of raw materials.

[0018] The total silicon content (ΣSi content) in the refined titanium tetrachloride obtained in this embodiment is 2 ppm, and other indicators also meet the standards of 0-grade refined titanium tetrachloride in the Commonwealth of Independent States.

Embodiment 2

[0020] The total silicon content (ΣSi content) in the crude titanium tetrachloride is 65ppm, the feed rate is 7.0t / h, the feed temperature is 80°C, the reflux ratio is 58, the tower top temperature is 130±0.5°C, and the reflux liquid temperature is 80±0.6°C, the pressure at the top of the tower is 1.6kPa, and the recovery rate of low boilers at the top of the tower is 3.2% of the feed rate of raw materials.

[0021] The total silicon content (ΣSi content) in the refined titanium tetrachloride obtained in this embodiment is 1.5 ppm, and other indicators also meet the 0-grade refined titanium tetrachloride standard of the Commonwealth of Independent States.

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Abstract

The invention belongs to the field of titanium chemical industry and particularly relates to and aims at providing a method of removing silicon in coarse titanium tetrachloride. The method comprises the steps that the coarse titanium tetrachloride is rectified to obtain fine titanium tetrachloride; all parameters of a rectifying tower are controlled as follows: the feeding speed is between 6 t / h and 10 t / h, the feeding temperature is between 65 DEG C and 85 DEG C, the reflux ratio is between 50 and 80, the tower top temperature is between 125 DEG C and 132 DEG C, the temperature of reflux liquid is between 75 DEG C and 85 DEG C, and the tower top pressure is between minus 2 kPa and 5 kPa. By the adoption of the method, the silicon in the coarse titanium tetrachloride can be removed, so that the fine titanium tetrachloride with the silicon content ranging from 1 ppm to 3 ppm is obtained.

Description

technical field [0001] The invention belongs to the field of titanium chemical industry, in particular to a method for removing silicon from crude titanium tetrachloride. Background technique [0002] Refined titanium tetrachloride is the raw material for producing sponge titanium and chloride-process titanium dioxide. [0003] There are three methods for producing crude titanium tetrachloride at present, namely shaft furnace chlorination, boiling chlorination and molten salt chlorination, but no matter which chlorination method is used, a certain amount of impurities are contained in the crude titanium tetrachloride. The main impurity is FeCl 3 , AlCl 3 , VOCl 3 、SiCl 4 、TiOCl 2 These impurities are extremely harmful to titanium tetrachloride and its subsequent products, so they need to be removed before entering the downstream production process. [0004] For the production process of sponge titanium, silicon will be enriched in sponge titanium at a concentration of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/02
CPCC01G23/024C01P2006/80
Inventor 苗庆东李开华陈爱祥李亮张瑶朱福兴盛卓马尚润
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP