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Low-temperature molten iron injection dephosphorization pretreatment method

A low-temperature molten iron and pretreatment technology, applied in the direction of improving process efficiency, can solve the problems of large investment in disposable equipment, small production capacity, and large floor area, so as to reduce the dephosphorization treatment cycle, reduce the temperature drop of molten iron, The effect of reducing the temperature drop of molten iron

Active Publication Date: 2013-06-05
BEIJING SHOUGANG INT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dephosphorization of special converters mainly has the following problems for some enterprises with small stainless steel output: (1) The investment in one-time equipment is large; (2) It covers a large area; (3) Due to the small production capacity, the converter cannot be fully utilized
Due to the above reasons, the temperature drop of molten iron during the treatment process is relatively large. In order to ensure the temperature requirements of the molten iron in subsequent processes, there must be a higher requirement for the temperature of the molten iron before dephosphorization. difficulty

Method used

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  • Low-temperature molten iron injection dephosphorization pretreatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Use the dephosphorization special molten iron tank 5 to hold molten iron (the weight of the molten iron is weighed in real time), transport the weighed dephosphorization special molten iron tank to the tipping car 4, click the tipping car on the control screen to the slag removal position (scraping The slag position is at the same position as the desiliconization and phosphorus treatment position) button, the dumper runs to the slag removal position, and then the slag removal operator operates the dumper (the operation button and the slag removal machine are operated on the same console) The molten iron tank (the tipping angle of the special tank for dephosphorization changes in real time between 0° and 52°, the specific tipping angle is subject to the fact that the molten iron does not flow out of the molten iron tank mouth) and the slag removal machine perform the slag removal operation.

[0020] (2) After the slag removal is completed, the molten iron tipping tran...

Embodiment 2

[0025] (1) The steps are the same as in Example 1.

[0026] (2) After the slag removal is completed, the molten iron tipping transport vehicle 4 runs to the temperature measurement sampling position to measure the temperature of the molten iron and sample the molten iron temperature (1171 ° C), molten iron weight (32t), composition (C: 4.14%; Si: 0.32%; Mn: 0.32%; P: 0.075; S: 0.026 content) and target phosphorus requirements (≤0.005%) are input into the control interface, and the program automatically sets the injection volume of desiliconization and phosphorus agent (795kg), And the amount of iron oxide scale (348kg), fluorite (100kg) and the amount of oxygen blown (753Nm 3 ), the desiliconization and dephosphorization treatment starts automatically. During the treatment process, the desiliconization and phosphorus agent (CaO powder) is sprayed into the molten iron through the spray gun 2 in the form of dense phase transport under the action of the carrier gas from the powd...

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Abstract

A low-temperature molten iron injection dephosphorization pretreatment method belongs to the field of steel-making molten iron pretreatment. A foundry ladle for dephosphorization is used to hold molten iron and a molten iron roll-over transport vehicle is used to transport the molten iron to a position wherein the molten iron will be processed. With the adoption of a dense phase conveying mode for injection, molten iron temperature reduction caused by carrier gas is minimized. With the blowing of oxygen, the gas O is provided for a reaction, the purpose of heating is achieved, and the addition amount of oxide scale is reduced so as to minimize molten iron temperature reduction caused by the addition of oxide scale. Low oxygen blowing speed realizes soft blow of the molten iron. Decarburization and demanganization reaction times are reduced, thus achieving the purpose of preserving carbon and manganese and maintaining chemical heat to the maximum. Due to the above positive effects, molten iron temperature reduction is minimized and the molten iron is heated by the use of oxygen. Finally, the low-temperature molten iron undergoes injection dephosphorization and the dephosphorizationrate reaches more than 90%.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of molten steel, and in particular provides a low-temperature molten iron blowing dephosphorization pretreatment method, which is suitable for the field of pretreatment of molten steel. Background technique [0002] Phosphorus is an impurity element in general stainless steel, which mainly reduces the plasticity of steel, enhances the brittleness of steel, and deteriorates the processing performance of stainless steel. For general stainless steel smelting produced by molten iron hot charging process, since the blast furnace molten iron contains [P] ~ 0.10%, and the general stainless steel finished product requires control [P] ≤ 0.035%, stainless steel resistant to intergranular corrosion should have P ≤ 0.010%, requiring resistance For stainless steel corroded by media such as concentrated nitric acid and urea, P≤0.005% should be used, so dephosphorization should be considered in stainless st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCY02P10/20
Inventor 张国栋张德国黄云张凌义
Owner BEIJING SHOUGANG INT ENG TECH
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