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Vacuum distillation method of sponge titanium

A technology of sponge titanium and vacuum, which is applied in the field of sponge titanium vacuum distillation, can solve the problems of unstable quality and high impurities of sponge titanium, and achieve the effect of saving distillation time, improving quality and improving distillation effect

Active Publication Date: 2018-02-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing vacuum distillation method easily leads to the technical problem that the titanium sponge has many impurities and unstable quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 adopts the method of the present invention to judge the end point of vacuum distillation of titanium sponge

[0027] After the distillation pot 1 is put into the furnace, the temperature of the first zone 6 of the electric distillation furnace is controlled at 900℃~980℃, the temperature of the second zone 7 is controlled at 980℃~1020℃, the temperature of the third zone 8 is controlled at 980℃~1020℃, and the temperature of the fourth zone 9 is controlled at 980℃~1020℃. The temperature is controlled within the range of 960°C to 1020°C. The duration from the start of distillation to the time when the lower vacuum reaches 100Pa is 28h, the duration from 100Pa to 10Pa is 32h, the duration from 10Pa to 4Pa is 35h, and the duration below 4Pa is 55h. The total time-consuming of the distillation process is 150h, and the Cl impurity content in the titanium sponge is only 0.045% at this time;

Embodiment 2

[0028] Embodiment 2 adopts the inventive method to judge the end point of vacuum distillation of titanium sponge

[0029] After the distillation pot 1 is put into the furnace, the temperature of the first zone 6 of the electric distillation furnace is controlled at 900℃~980℃, the temperature of the second zone 7 is controlled at 980℃~1020℃, the temperature of the third zone 8 is controlled at 980℃~1020℃, and the temperature of the fourth zone 9 is controlled at 980℃~1020℃. The temperature is controlled within the range of 960°C to 1020°C. The duration from the start of distillation until the lower vacuum reaches 100Pa is 25h, the duration from 100Pa to 10Pa is 34h, the duration from 10Pa to 4Pa is 50h, and the duration below 4Pa is 42h. The total time-consuming of the distillation process is 150h, and the Cl impurity content in the titanium sponge is only 0.048%;

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Abstract

The invention belongs to the technical field of sponge titanium and particularly relates to a vacuum distillation method of sponge titanium. In order to solve the technical problems that the sponge titanium contains a plurality of impurities and is unstable in quality which are easily caused by the existing vacuum distillation method, the invention provides a vacuum distillation method of sponge titanium. The vacuum distillation method of sponge titanium comprises the following steps: a, putting the sponge titanium in a distillation electric furnace, vacuumizing and distilling, reducing the pressure in the electric furnace to 100Pa in 20-30 hours, then reducing the pressure in the furnace to 8-10Pa in 30-50 hours; b, continuously vacuumizing, reducing the pressure in the furnace from 8-10Pa to be less than 4Pa in 30-50 hours, keeping the pressure for 40-60 hours, and keeping the vacuum degree of the furnace at 8-10Pa for more than or equal to 90 hours. The method is capable of reducingthe content of the impurities in the sponge titanium, improving the quality of the sponge titanium, reducing the distillation time, reducing the energy consumption and reducing the production cost, and has important practical significance.

Description

technical field [0001] The invention belongs to the technical field of titanium sponge production, and in particular relates to a method for vacuum distillation of titanium sponge. Background technique [0002] In industry, the magnesium thermal method is used to produce sponge titanium, which mainly includes magnesium reduction and vacuum distillation. The vacuum distillation process of sponge titanium is to reduce magnesium to residual MgCl 2 , Mg, and insufficiently reduced low-valent titanium chloride and other impurities are separated from sponge titanium to obtain pure sponge titanium. [0003] According to the process, the vacuum distillation process can be divided into a distillation stage with a large amount of volatiles in the early stage and a high temperature stage in the middle and late stage. The pre-distillation stage is mainly to remove Mg and MgCl on the outer surface of sponge titanium 2 , the high constant temperature stage in the middle and late stage ...

Claims

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Application Information

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IPC IPC(8): C22B34/12C22B9/02
Inventor 李开华李亮盛卓苗庆东
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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