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Molten iron dephosphorizing device adopting rotary injection of powder, and dephosphorizing method

A technology of rotary injection and rotating device, applied in the field of iron and steel metallurgy, can solve the problems of low dephosphorization rate and huge transformation investment, and achieve the effect of improving the dephosphorization rate, equipment modification and investment, and shortening the dephosphorization treatment time.

Inactive Publication Date: 2017-10-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dephosphorization rate of this method is low, and the investment in equipment transformation is huge

Method used

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  • Molten iron dephosphorizing device adopting rotary injection of powder, and dephosphorizing method
  • Molten iron dephosphorizing device adopting rotary injection of powder, and dephosphorizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using the present invention to carry out the molten iron dephosphorization test, the maximum diameter of the anti-splashing device 2 is 110% of the outer diameter of the mouth of the molten iron tank 5, and the powder spray gun 7 is wrapped with refractory material, and the refractory length is 1 / 2 of the total length of the powder spray gun; Start the injection system 8 to inject nitrogen or inert gas with a purity of 99.9% or more and a pressure of 0.4MPa into the molten iron through the powder spray gun 7. At the same time, turn on the elevator 9 to lower the externally wrapped refractory powder spray gun 7 to the bottom of the molten iron tank 5. 400mm, when the powder spray gun 7 reaches the working position, turn on the rotating device 4, the rotation speed is 10 rpm, and at the same time start the feeding system 3 to spray the total amount of dephosphorization agent that needs to be added into the molten iron through the powder spray gun 7; The ratio of iron oxide ...

Embodiment 2

[0030] Using the present invention to carry out the molten iron dephosphorization test, the maximum diameter of the anti-splashing device 2 is 120% of the outer diameter of the molten iron tank 5, and the powder spraying gun 7 is wrapped with refractory material, and the length of the refractory material is 2 / 3 of the total length of the powder spraying gun; Start the injection system 8 to inject nitrogen or inert gas with a purity of 99.9% or more and a pressure of 0.5MPa into the molten iron through the powder spray gun 7. At the same time, turn on the elevator 9 to lower the externally wrapped refractory powder spray gun 7 to the bottom of the molten iron tank 5. 450mm, when the powder spray gun 7 reaches the working position, turn on the rotating device 4, the rotation speed is 20 rpm, and at the same time start the feeding system 3 to spray the total amount of dephosphorization agent to be added into the molten iron through the powder spray gun 7; The ratio of iron oxide wa...

Embodiment 3

[0032] Using the present invention to carry out the molten iron dephosphorization test, the maximum diameter of the anti-splashing device 2 is 130% of the outer diameter of the mouth of the molten iron tank 5, and the powder spray gun 7 is wrapped with refractory material, and the length of the refractory material is 2 / 3 of the total length of the powder spray gun; Start the injection system 8 to inject nitrogen or inert gas with a purity of 99.9% or more and a pressure of 0.6MPa into the molten iron through the powder spray gun 7. At the same time, turn on the elevator 9 to lower the externally wrapped refractory powder spray gun 7 to the bottom of the molten iron tank 5. 500mm, when the powder spray gun 7 reaches the working position, turn on the rotating device 4, the rotation speed is 30 rpm, and at the same time start the feed system 3 to spray the total amount of dephosphorization agent that needs to be added into the molten iron through the powder spray gun 7; The ratio o...

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Abstract

The invention discloses a molten iron dephosphorizing device adopting rotary injection of powder, and a dephosphorizing method. Through the molten iron dephosphorizing device adopting rotary injection of powder, a multipoint simultaneous dephosphorizing process can be achieved by using an inverted T-shaped powder gun, and the dynamic conditions of dephosphorization reaction are improved; the dephosphorization rate is improved effectively, and the dephosphorization reaction speed increases; the dephosphorization processing time is shortened, and the investment is low; a feeding system and an injection system can be controlled automatically and adjusted on line; and the powder gun is prevented from being blocked effectively, and automatic deslagging of the powder gun can be achieved.

Description

Technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a molten iron dephosphorization device and a dephosphorization method for rotating powder spraying. Background technique [0002] Phosphorus is a harmful element in most steel grades, and it is easy to segregate at grain boundaries, causing low-temperature brittleness and temper brittleness of steel. In recent years, with the rapid development of science and technology, users' requirements for steel quality have continued to increase. For example, for low-temperature steel, marine steel, hydrogen-induced cracking steel, and steel for some thick plates, in addition to requiring extremely low sulfur content, phosphorus content in steel is also required <0.01% or 0.005%. [0003] In addition, in order to reduce the production cost of oxygen converter steel and implement steelmaking with less slag, the phosphorus content of molten iron is also required <0.015%. Therefore, si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064
CPCC21C1/02C21C7/064
Inventor 唐复平万雪峰廖相巍曹东李广帮任子平贾吉祥张晓光赵亮李晓伟
Owner ANGANG STEEL CO LTD
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