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Method for gasification dephosphorization and thermal-state cyclic utilization of converter slag

A converter slag and dephosphorization technology, which is applied in the manufacture of converters, etc., can solve the problems of improving dephosphorization effect, increasing carbon emissions, and high cost of solid reductants, and achieves the goal of realizing thermal recycling, reducing carbon emissions, and saving costs Effect

Inactive Publication Date: 2022-07-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the cost of solid reductants is high, and carbonaceous reductants will also increase carbon emissions to a certain extent; Overall improvement of dephosphorization effect

Method used

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  • Method for gasification dephosphorization and thermal-state cyclic utilization of converter slag
  • Method for gasification dephosphorization and thermal-state cyclic utilization of converter slag
  • Method for gasification dephosphorization and thermal-state cyclic utilization of converter slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Using a 210t top-bottom double blowing converter, there are 12 ring-slit ventilation bricks at the bottom, which are evenly arranged in 0.5D concentric circles. After the smelting of the previous furnace, about 15 tons of slag remained, and the phosphorus content in the slag was 0.90%. Add 24 tons of scrap steel, add 186 tons of molten iron, the phosphorus content of molten iron and scrap steel are 0.056% and 0.03% respectively, and the content of silicon in molten iron is 0.5%; start blowing, bottom blow hydrogen, flow rate is 1260Nm 3 / hour, the top blowing oxygen flow is 48000Nm 3 / hour, the gun position is controlled at 1.8-2.2m during the smelting process; after 5 minutes of blowing, the molten steel temperature in the molten pool reaches 1400 °C, the furnace is turned down, and 6 tons of slag is discharged; shake the converter, continue to blow, and blow hydrogen at the bottom. 700Nm 3 / hour, the top blowing oxygen flow is 50000Nm 3 / hour, the gun position is c...

Embodiment 2

[0042] A 210t top-bottom double blowing converter is used, and 16 through-hole ventilation bricks are used at the bottom, which are staggered in the 0.7D and 0.55D concentric circles. After the smelting of the previous furnace, about 16 tons of slag remained, and the phosphorus content in the slag was 0.93%. Add 25 tons of scrap steel, add 185 tons of molten iron, the phosphorus content of molten iron and scrap steel are 0.060% and 0.032% respectively, and the content of silicon in molten iron is 0.55%; start blowing, blow hydrogen at the bottom, and the flow rate is 1890Nm 3 / hour, the top blowing oxygen flow is 46000Nm 3 / hour, the gun position is controlled at 1.9-2.2m during the smelting process; after 5.5 minutes of blowing, the molten steel temperature in the molten pool reaches 1430 ° C, the furnace is turned down, and the slag is 7 tons; shake the converter, continue to blow, and blow hydrogen at the bottom. 1000Nm 3 / hour, the top blowing oxygen flow is 48000Nm 3 / ...

Embodiment 3

[0044] A 210t top-bottom double blowing converter is used, and 20 diffused-type air-permeable bricks are used at the bottom, which are staggered in 0.75D and 0.55D concentric circles. After the smelting of the previous furnace, about 16 tons of slag remained, and the phosphorus content in the slag was 0.88%. . Add 30 tons of scrap steel, add 180 tons of molten iron, the phosphorus content of molten iron and scrap steel are 0.062% and 0.033% respectively, and the silicon content of molten iron is 0.60%; start blowing, blow hydrogen at the bottom, and control the flow rate to 2500Nm 3 / hour, the top blowing oxygen flow is 45000Nm 3 / hour, the gun position is controlled at 1.9-2.3m during the smelting process; after 4.5 minutes of blowing, the molten steel temperature in the molten pool reaches 1390 ° C, the furnace is turned down, and the slag is 8 tons; 1200Nm 3 / hour, the top blowing oxygen flow is 52000Nm 3 / hour, the gun position is controlled to 1.5-2.0m during the smel...

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Abstract

The invention provides a method for gasification dephosphorization and hot-state cyclic utilization of converter slag, and belongs to the field of ferrous metallurgy. In the whole converter smelting process, bottom blowing hydrogen gasification dephosphorization is achieved, the phosphorus content in slag in the smelting process is reduced, and dephosphorization in the converter smelting process is promoted; after converter tapping is finished, slag is left, bottom-blowing hydrogen gasification dephosphorization continues, meanwhile, top lance hydrogen blowing stirring and gasification dephosphorization can be adopted, or top lance hydrogen blowing slag splashing furnace protection is adopted, and the phosphorus content in the slag is reduced; and then directly adding waste steel, adding molten iron for smelting, and thermally recycling furnace slag. According to the method, gasification dephosphorization is conducted through bottom blowing hydrogen in the converter smelting process, slag gasification dephosphorization treatment is conducted in combination with bottom blowing hydrogen after tapping, gasification dephosphorization is conducted through top lance hydrogen blowing stirring slag and gasification dephosphorization is conducted in the top blowing hydrogen slag splashing converter protection process, efficient removal of phosphorus in the slag is achieved, accordingly, hot-state cyclic utilization of the slag is achieved, energy is saved, emission is reduced, and the method is suitable for industrial production. The cost is saved.

Description

【Technical field】 [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for gasification, dephosphorization and thermal recycling of converter slag. 【Background technique】 [0002] Dephosphorization is an important task in the converter smelting process. Phosphorus in molten steel mainly reacts with slag steel to generate phosphorus oxides and enters the slag for enrichment. However, with the enrichment of phosphorus content in the slag, the dephosphorization ability of the slag gradually decreases, and even the phenomenon of phosphorus reversion occurs, which directly affects the dephosphorization effect of the smelting process. At the same time, after the converter smelting is completed, the slag has to be discarded due to its high phosphorus content, which not only results in the discharge of a large amount of metallurgical solid waste, but also brings a large amount of waste of latent heat of the slag and valuable com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C7/064C21C5/48C21C5/36
CPCC21C5/35C21C7/064C21C5/48C21C5/36
Inventor 刘建华何杨彭宏博
Owner UNIV OF SCI & TECH BEIJING
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