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Dephosphorization agent prepared by taking slag of decarbonization furnace as raw material and molten iron dephosphorization method

A dephosphorization agent and decarburization furnace technology, applied in the manufacture of converters, etc., can solve the problems of high content, affecting the dephosphorization of molten iron, and difficult pouring of slag, so as to achieve the effect of improving the dephosphorization rate

Active Publication Date: 2014-01-08
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the content of phosphorus pentoxide in the final slag of the converter is relatively high, which increases the phosphorus load of molten iron, which is not conducive to dephosphorization
However, the existing problem is that the temperature in the early stage of the converter is low, and the slag melts slowly after adding a large amount of lime and sinter, which makes it difficult to pour out the dephosphorized slag, which affects the dephosphorization effect of molten iron.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This implementation is aimed at the process of preparing a dephosphorizing agent for the dephosphorization of molten iron in a 300t dephosphorization furnace. The molten iron is 275t, the scrap steel is 35t, the initial phosphorus content of the molten iron is 0.092%, and the temperature of the molten iron is 1340°C. The ratio (% by weight) of the dephosphorization agent used is: 50% of decarburization furnace slag, 20% of dedusting ash, 20% of lime powder, and 10% of slagging agent. Prepare the dephosphorization agent according to the above composition. The hemispherical temperature of the dephosphorization agent was measured to be 1256°C. The dephosphorization furnace is blown for 6 minutes, and when the blowing is started, add 3.0t of dephosphorization agent, 3.0t of lime, 1.5t of sintered ore, 2.0t of lightly burned dolomite, and the top blowing flow rate is 25000-35000Nm 3 / h, the bottom blowing strength is 0.15~0.25Nm 3 / t.min, after blowing, [C]=3.2%, [P]=0.02...

Embodiment 2

[0030] This implementation is aimed at the process of preparing a dephosphorization agent for the dephosphorization of molten iron in the early stage of the converter for a 120t top-bottom combined blowing converter. The molten iron is 100t, the scrap steel is 12t, the initial phosphorus content of the molten iron is 0.088%, and the temperature of the molten iron is 1300°C. The ratio (% by weight) of the dephosphorization agent used is: 55% of decarburization furnace slag, 22% of dedusting ash, 15% of lime powder, and 8% of slagging agent. Prepare the dephosphorization agent according to the above composition. The hemispherical temperature of the dephosphorization agent was measured to be 1267°C. The pretreatment time of the converter is 8 minutes. When the blowing is started, 1.0t of dephosphorization agent, 1.0t of lime, 0.6t of pellets, 0.5t of magnesium balls are added, and the flow rate of top blowing is 18000-22000Nm 3 / h, the bottom blowing strength is 0.06~0.1Nm 3 / ...

Embodiment 3

[0032] This implementation is aimed at the process of preparing a dephosphorization agent for the dephosphorization of molten iron in the early stage of the converter for a 50t top-bottom combined blowing converter. The molten iron is 45t, the scrap steel is 3t, the initial phosphorus content of the molten iron is 0.068%, and the temperature of the molten iron is 1280°C. The ratio (% by weight) of the dephosphorization agent used is: 52% of decarburization furnace slag, 28% of dedusting ash, 10% of lime powder, and 10% of slag-removing agent. Prepare the dephosphorization agent according to the above composition. The hemispherical temperature of the dephosphorization agent was measured to be 1252°C. The pretreatment time of the converter is 7 minutes. When the blowing is started, 0.7t of dephosphorization agent, 0.8t of lime, 0.2t of sintered ore, and 0.3t of magnesium balls are added, and the top blowing flow rate is 9000-12000Nm 3 / h, the bottom blowing strength is 0.06~0....

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Abstract

The invention discloses a dephosphorization agent prepared by taking slag of a decarbonization furnace as a raw material and a molten iron dephosphorization method, and belongs to the technical field of molten iron desulphurization. The dephosphorization agent is composed of, by weight, 40-60% of the slag of the decarbonization furnace, 10-30% of fly ash, 10-30% of lime powder and 5-10% of a slagging agent; after being processed by a slag processing method, the slag of the decarbonization furnace is taken as a standby material of the dephosphorization agent after magnetic separation, smashing and levigating, and a prepared material is pressed to be the dephosphorization agent by a high-pressure ball press after uniform mixing. After a converter starts blowing, the dephosphorization agent is added in 10-20kg / t of steel, 10-20kg / t of lime and 10-20kg / t of magnesium balls or light-burned dolomite to form pre-slag of molten iron desulphurization at the early stage of the converter, and more than 60% of molten iron desulphurization rate at the early stage of the converter can be obtained. A condition is created for realizing a converter clean steal smelting platform.

Description

technical field [0001] The invention belongs to the technical field of molten iron desulfurization, and in particular relates to a dephosphorization agent prepared from decarburization furnace slag and a method for dephosphorizing molten iron, a dephosphorization agent for dephosphorization of molten iron in the metallurgical production process, and a method using the dephosphorization agent Converter molten iron dephosphorization process. Background technique [0002] At present, the amount of steel slag produced in my country is about 70 million tons, and the amount of unused steel slag dumped is about 300 million tons, covering an area of ​​30,000 mu. The comprehensive utilization rate of steel slag resources is only 35%. Actively developing and applying advanced and effective treatment technology and resource utilization new technology, improving the utilization rate of steel slag, and finally realizing "zero" discharge of steel slag is one of the important issues for ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35C21C7/064
Inventor 吴伟曾加庆孟华栋杨利彬张曦东
Owner CENT IRON & STEEL RES INST
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