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Method of replacing lime with limestone for slagging and producing steel in oxygen top blown converter

A technology of oxygen top blowing and converter steelmaking, applied in the direction of manufacturing converters, etc., can solve problems such as physical heat waste, and achieve the effects of reducing storage costs, saving energy and costs, and improving heat utilization and production efficiency.

Inactive Publication Date: 2009-09-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that, compared with reheating and raising the temperature in the oxygen top-blown converter, a large amount of physical heat that the calcined lime has is wasted in vain.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, test is carried out in 25 tons of oxygen top-blown converters. After adding 25 tons of molten iron, blow the gun with oxygen for 0.5 minutes and then start adding limestone and fluorite in batches. Limestone is added in batches of 1.2 tons every 1 minute for a total of 6 times, and fluorite is added every 2 minutes. for 3 joins. About 3 minutes after all the slagging agent is added, the carbon flame is lit up and enters the decarburization period. After blowing oxygen for 12 minutes, the furnace was inverted to take samples and measure the temperature. The composition was qualified and the temperature was 1670°C, and then the steel was tapped.

Embodiment 2

[0020] Embodiment 2, test is carried out in 25 tons of oxygen top-blown converters. First add 600 kg of lime, and then add 2 tons of scrap steel. Then add 23 tons of molten iron, then blow the gun with oxygen for 2 minutes to raise the temperature, then start to add limestone and fluorite in batches, 1.45 tons of limestone in each batch of slagging agent, add once every 1.5 minutes, a total of 4 times. About 2 minutes after all the slagging agent is added, the carbon flame is lit up and enters the decarburization period. Oxygen blowing for 11 minutes, the furnace was reversed to take samples and measure the temperature. The composition was qualified, and the temperature was 1660°C, and then the steel was tapped, which showed that adding limestone to make slag did not affect the normal smelting.

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Abstract

The present invention belongs to the field of steel production, and relates to a method of replacing lime with limestone for slagging and producing steel in an oxygen top blown converter. The invention is characterized in that the limestone is directly added during slagging in the steel production process. The added batch number is increased and the amount of each batch of material is reduced. Namely the lime is added by 1-3 times for slagging formerly, and when the limestone is added for slagging, the limestone is added by 4-8 times. The adding amount of each time, calculated according to the CaO therein, is 1 / 2-1 / 3 of lime added formerly and is for preventing the condensing and incrusting at the metal surface in the furnace in the early period of converting. The adding amount of limestone, calculated according to CaO therein, accounts for 30%-100% of adding amount of lime in the batch. The method of the invention has the main advantages of elimination of lime calcining procedure or reduction of production scale, reduction of cost required for operating the calcining device and reducing the discharged pollution, prevention of heat waste caused by cooling the lime after calcining, low sulfur content in the lime generated in the oxygen top blown converter, and benefit for restraining resulfurization of melted iron in the steel production process.

Description

technical field [0001] The invention belongs to the field of converter steelmaking and relates to a method for making slagging steel with limestone instead of lime in an oxygen top-blown converter. Background technique [0002] Oxygen top-blown converter steelmaking is a process of forced oxygen supply, rapid oxidation to remove impurity elements in molten iron, and heating molten steel to increase temperature by element oxidation heat. Lime slag needs to be added in the furnace to remove impurity element phosphorus in molten iron. [0003] Lime is a product obtained by calcination of limestone. In production, the limestone is generally heated to above 1200°C. The calcination process is carried out for several hours, during which the limestone (calcium carbonate) decomposes and releases CO 2 And become lime (calcium oxide). Lime carries a large amount of physical heat after it is fired, and it must be cooled to a temperature suitable for transportation before it can be tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
Inventor 李宏曲英
Owner UNIV OF SCI & TECH BEIJING
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