Molten iron pretreatment adhering type slag removing technology and device

A technology of molten iron pretreatment and slag dipping, which is applied in the direction of improving process efficiency, mechanical cleaning, and manufacturing tools, etc., can solve the problems of cooling and crusting, low slag removal rate by gas slag, and achieves fast cooling speed and covers an area of ​​​​ Small, small iron loss effect

Active Publication Date: 2017-03-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slag removal process is a molten iron pretreatment slag removal process that combines pneumatic slag removal and slag removal. It is based on the mechanical slag removal method with gas slag removal. The upper slag layer will quickly cool down and crust due to the injection of gas. , resulting in a low rate of gas slag removal and slag removal, and the solid slag that cannot overflow automatically still needs to be removed by a slag removal board, so the problems existing in the mechanical slag removal method cannot be avoided

Method used

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  • Molten iron pretreatment adhering type slag removing technology and device

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Comparison scheme
Effect test

Embodiment 1

[0047] In the smelting laboratory, a "500kg multifunctional experimental furnace" was used to simulate the molten iron tank 7, and the adhesion type slag removal device of the present invention was used to perform a slag removal experiment on the molten iron tank 7 with a capacity of 400 kg. The diameter of the slag pan 5 that is used is 80% of the diameter of the mouth of the molten iron tank 7, the cooling water pressure of the water cooling system 4 is 0.5MPa, and the temperature measurement system 6 is 4 thermocouples installed on the slag pan 5. 4 high-pressure water guns 11 and 4 mechanical wind shovels 9 are installed above the 10; adopt once to dip slag during the slag removal operation, and the slag-stick pan 5 stays in the slag layer 13 for 60 seconds, and the high-pressure water gun 11 spray processing time is In 30 seconds, the residue can be cleaned up without the need for a mechanical wind shovel 9 to remove the residue.

Embodiment 2

[0049] In the smelting laboratory, a "500kg multifunctional experimental furnace" was used to simulate the molten iron tank 7, and the adhesion type slag removal device of the present invention was used to perform a slag removal experiment on the molten iron tank 7 with a capacity of 400 kg. The diameter of the slag pan 5 that is used is 85% of the diameter of the 7 tank mouths of the molten iron tank, the cooling water pressure of the water cooling system 4 is 0.8MPa, and the temperature measurement system 6 is 6 thermocouples installed on the slag pan 5. 5 high-pressure water guns 11 and 3 mechanical air shovels 9 are installed above the 10; the slag removal operation adopts secondary slag dipping, and the slag-sticking tray 5 stays in the slag layer 13 for 90 seconds each time the slag is stained; 11 The spray treatment time is 45 seconds, and the remaining small amount of residue is cleaned by mechanical air shovel 9.

Embodiment 3

[0051] In the smelting laboratory, a "500kg multifunctional experimental furnace" was used to simulate the molten iron tank 7, and the adhesion type slag removal device of the present invention was used to perform a slag removal experiment on the molten iron tank 7 with a capacity of 400 kg. The diameter of the slag pan 5 that is used is 90% of the diameter of the mouth of the molten iron tank 7, the cooling water pressure of the water cooling system 4 is 1.0MPa, and the temperature measurement system 6 is 8 thermocouples installed on the slag pan 5, and the slag pan is installed on the slag pan. 6 high-pressure water guns 11 and 2 mechanical wind shovels 9 are installed above the 10; adopt once to dip slag during the slag removal operation, and the slag-stick pan 5 stays in the slag layer 13 for 120 seconds, and the high-pressure water gun 11 spraying treatment time is For 60 seconds, the remaining small amount of residue is cleaned by mechanical wind shovel 9.

[0052] In th...

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Abstract

The invention relates to a molten iron pretreatment adhering type slag removing technology and device. A molten iron tank is conveyed to a slag removing station, slag adhering discs are lowered into the molten iron tank, and the slag adhering discs are cooled through a water cooling system; temperature measuring devices arranged on the slag adhering discs are used for controlling the immersion depth of the slag adhering discs, water cooling of adhering slag is conducted after the slag adhering discs stay in a slag layer for 60-120 s, and then the slag adhering discs are elevated to the position above the tank edge of the molten iron tank; the slag adhering discs are rotated to the slag removing station through a rotation mechanism, and solid slag on the slag adhering discs is removed; and the above slag adhering and removing processes are repeatedly conducted till all desulfurized slag in the molten iron tank is completely removed. The adhering type slag removing manner is adopted, the characters that the desulfurized slag is low in specific gravity and high in cooling speed are utilized, the desulfurized slag is rapidly solidified in a chilling condition and adheres to the slag adhering discs, and then the slag adhering discs are cleaned. The molten iron pretreatment adhering type slag removing technology and device have the beneficial effects that the slag removal rate is high, iron losses are small, and the slag removing efficiency is high.

Description

technical field [0001] The invention relates to the technical field of molten iron refining, in particular to an adhesion type slag removal process and device for pretreatment of molten iron. Background technique [0002] Hot metal pretreatment is of great significance to improve the quality of molten steel and expand varieties. Hot metal desulfurization is one of the important means of hot metal pretreatment, and the quality of molten iron will be greatly improved after desulfurization. However, the sulfur content of iron slag after hot metal desulfurization treatment is very high, which is very harmful to the steelmaking process and quality. If this part of iron slag with higher sulfur content enters the steelmaking furnace, the amount of lime will be increased, and sulfur may also enter the molten steel from the slag, so that the effect of desulfurization pretreatment of molten iron will be significantly reduced. Therefore, after the pretreatment of molten iron, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D43/00C21C7/064
CPCY02P10/20
Inventor 曹东吕志升万雪峰廖相巍张晓光倪翀奕朱晓雷张宁
Owner ANGANG STEEL CO LTD
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