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A method for improving the dephosphorization rate of desiliconization furnace based on double converter method for smelting high-silicon hot metal

A furnace dephosphorization rate, high silicon technology, applied in the field of iron and steel smelting, can solve the problems of large splash, heat imbalance, smelting process out of control, etc., achieve the effect of reducing production pressure, reducing losses, and improving desiliconization and dephosphorization efficiency

Active Publication Date: 2020-08-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation process of silicon is a strong exothermic reaction. If the traditional single-slag or double-slag process is used, the heat in the converter smelting process will be seriously unbalanced, the smelting process will be out of control, and large splashes will occur.

Method used

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  • A method for improving the dephosphorization rate of desiliconization furnace based on double converter method for smelting high-silicon hot metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The content of molten iron [Si] is 4.00%, the content of molten iron [C] is 4.20%, the content of molten iron [P] is 0.145%, the temperature of molten iron is 1302 ° C, and the operation is carried out by double converter method (desiliconization furnace + decarburization furnace). According to the content of molten iron [Si], the loading amount of molten iron in the desiliconization furnace is set to 95t, the loading amount of scrap steel is 30t, and the oxygen supply is set to 3500Nm 3 o 2 .

[0060] Add 10.23kg / t of lime and 9.50kg / t of dolomite before blowing, add 36.26kg / t of lime, 21.35kg / t of dolomite and 8.15kg / t of iron ore before blowing 30% oxygen. Depending on the smelting situation, 15.12kg / t of lime, 9.12kg / t of dolomite and 7.91kg / t of iron ore are added at about 50% oxygen blowing. The total lime consumption per ton of steel is 61.61kg / t, dolomite consumption is 39.97kg / t, and iron ore consumption is 16.06kg / t. The temperature of the semi-steel is 150...

Embodiment 2

[0069] Compared with Example 1, this experimental example is only different in the silicon content of molten iron, the scrap ratio, the amount of smelting slag added, the tapping temperature, and the carbon and phosphorus content at the end point. The content of molten iron [Si] is 2.30%, the content of molten iron [C] is 4.10%, the content of molten iron [P] is 0.152%, the temperature of molten iron is 1321 °C, and the operation is carried out by a double method (desiliconization furnace + decarburization furnace).

[0070]The [Si] content of molten iron in this heat is 2.30%, so the steel scrap ratio is lower than the setting, the molten iron loading is set to 100t, the scrap loading is 25t, and the oxygen supply is set to 2000Nm 3 o 2 .

[0071] Add 8.11kg / t of lime and 7.50kg / t of dolomite before blowing, and add 24.12kg / t of lime, 15.35kg / t of dolomite and 6.42kg / t of iron ore before blowing 30% oxygen. Depending on the smelting situation, 8.31kg / t of lime, 8.22kg / t of ...

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Abstract

The invention provides a method of increasing the dephosphorization rate of a desilication furnace in smelting high-silicon molten iron based on the duplex process of converter, and relates to the technical field of iron and steel smelting. The method can ensure the stable and smooth operation of the smelting of the high-silicon molten iron by the duplex process, increase the dephosphorization rate of the desilication furnace, stabilize the temperature and composition of molten semi-steel, and reduce the production pressure for follow-up smelting in a decarburization furnace as well as the production cost. In the method, the high-silicon molten iron is smelted firstly in the desilication furnace and then in the decarburization furnace; according to the [Si] content of the molten iron, a ratio of scrap steel and an amount of oxygen supply are adjusted to ensure the stable and smooth operation of the smelting process of the desilication furnace, so that the composition and temperature atthe time of steel tapping meet the subsequent requirements of the decarburization furnace; by adjusting the amounts of slag-making auxiliary materials added in the desilication furnace and the orderin which the slag-making auxiliary materials are added, and by increasing the amount of added iron ore, the content of iron oxide in the slag in the desilication furnace is controlled; and by controlling bottom blowing, the dynamic conditions of the dephosphorization in the desilication furnace are optimized to allow the dephosphorization rate of the desilication furnace to reach 30-60%. The technical scheme provided by the invention is applicable to the smelting process of the high-silicon molten iron.

Description

【Technical field】 [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for improving the dephosphorization rate of a desiliconization furnace by smelting high-silicon molten iron based on a double converter method. 【Background technique】 [0002] Ouye Furnace is based on a smelting reduction ironmaking technology (not a blast furnace) developed by VAI and German Koff Company, and is currently the only smelting reduction ironmaking technology in the world that realizes the industrial production of oxygen smelting. Due to the adoption of smelting reduction ironmaking technology, the furnace temperature is about 200°C higher than that of the traditional blast furnace ironmaking process, and the silicon in the raw materials fed into the furnace is fully reduced, resulting in a higher silicon content in molten iron than in normal blast furnaces. The highest silicon content in water is 10.5%, the lowest is 1.2%, and the average ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/04C21C5/35C21C7/068C22C37/10C21C5/36
CPCC21C5/35C21C5/36C21C7/04C21C7/064C21C7/068C21C2007/0093C22C37/10Y02P10/20
Inventor 李晶张春辉戴雨翔苏磊闫威张浩宋沈杨侯玉婷
Owner UNIV OF SCI & TECH BEIJING
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