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Re-melting method for reduction tank used for sponge titanium production

A technology of reduction tank and sponge titanium, which is applied in the repair and maintenance process of sponge titanium production equipment, can solve the problems of increasing impurity elements and affecting product quality, and achieve the effect of improving quality

Active Publication Date: 2020-07-28
PANGANG GROUP TITANIUM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fact that the fault reduction tank has been placed for too long during the treatment period or air and water vapor have entered the reduction tank, it will be directly put into the reduction furnace for production after the fault treatment is completed, which will cause the increase of N, O and H impurity elements in sponge titanium products and affect product quality.
In order to solve this problem, it is necessary to find a method for the reduction and return of sponge titanium production to avoid the increase of N, O and H impurity elements during the reduction and return to the furnace, which will affect the quality of the product.

Method used

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  • Re-melting method for reduction tank used for sponge titanium production
  • Re-melting method for reduction tank used for sponge titanium production

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Effect test

specific Embodiment

[0023] The object of the present invention is to provide a method for producing sponge titanium and returning it to the furnace, so as to ensure that N, O and H impurity elements are reduced to affect product quality during reduction and returning to the furnace.

[0024] In order to achieve the above-mentioned purpose, the method for producing and returning the sponge titanium to the furnace of the present invention, and the method for removing the air in the reduction tank after cooling: the reduction tank after the failure treatment is completed after cooling, and the air in the tank is drawn out by vacuuming to within 40Pa.

[0025] In order to achieve the above-mentioned purpose, the method for producing sponge titanium of the present invention and returning to the furnace, and the method for removing the air in the reduction tank of the furnace: the furnace temperature is less than 50°C when the reduction is put into the furnace, and the reduction tank is connected to the ...

Embodiment 1

[0030] 1. Connect the reduction tank after troubleshooting to the vacuum system, use a vacuum pump to evacuate the reduction tank to within 40Pa and close the evacuation valve.

[0031] 2. The reduction tank that has been evacuated is filled with high-purity argon with an oxygen content of less than 7ppm, and the pressure is above 30kPa. Disconnect the vacuum line.

[0032] 3. When returning to the furnace, the temperature of the reduction tank is less than 50°C when it is reduced into the furnace. After reduction into the furnace, the reduction tank is connected to the vacuum system, and the argon in the tank is pumped out, and the vacuum is pumped to above -80kPa.

[0033] 4. In the vacuum state above -80kPa, the reduction tank is heated and degassed, and the water vapor in the material in the reduction tank is extracted. The degassing temperature and time are shown in the table below:

[0034]

[0035]

[0036] 5. After the degassing of the reduction tank in the fur...

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Abstract

The invention discloses a re-melting method, in particular to the re-melting method for a reduction tank for sponge titanium production, which belongs to the technical field of the sponge titanium production equipment maintaining and repairing process. The invention provides the re-melting method for the reduction tank used for sponge titanium production, and the re-melting method can effectivelyreduce content of impurities in the reduction tank subjected to fault treatment. According to the re-melting method disclosed by the invention, a reduction tank inner environment which meets requirements is obtained by medium-low-temperature vacuum-pumping degassing and high-temperature inert gas slag filling on the basis of a reduction tank entering a reduction furnace, wherein a state that an in-furnace temperature does not exceed 570 DEG C is a medium-low-temperature state, and a state that the in-furnace temperature is greater than 570 DEG C is a high-temperature state.

Description

technical field [0001] The invention relates to a furnace returning method, in particular to a furnace returning method for a reduction tank used in titanium sponge production, and belongs to the technical field of repair and maintenance technology for titanium sponge production equipment. Background technique [0002] Due to failure in the reduction production process of titanium sponge, the furnace was shut down for cooling to deal with the failure. Because the titanium tetrachloride has not been added, it is necessary to carry out the reduction and feeding production again. Due to the fact that the fault reduction tank has been placed for too long during the treatment period or air and water vapor have entered the reduction tank, it will be directly put into the reduction furnace for production after the fault treatment is completed, which will cause the increase of N, O and H impurity elements in sponge titanium products and affect product quality. . In order to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/12C22B9/04
CPCC22B34/1263C22B9/04Y02P10/20
Inventor 张占棚许虎诚程勇国
Owner PANGANG GROUP TITANIUM INDAL