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Method for recycling granular iron and stabilizing temperature of KR procedure

A granular iron and process technology, which is applied in the field of comprehensive utilization of steel slag in iron and steel plants, can solve the problem of no obvious effect on stable desulfurization temperature, and achieve the effects of improving the utilization rate of heat and raw materials, high economic benefits, and reducing the use of cooling materials

Inactive Publication Date: 2013-11-27
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has no obvious effect on stabilizing the desulfurization temperature. When the temperature of the molten iron is too high, it is still necessary to add a cooling material to the molten iron for cooling operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for recycling granular iron and stabilizing the KR process temperature is characterized in that it consists of the following steps:

[0044] (1) After the ladle enters the KR entry station from the upstream link, determine the actual temperature of the molten iron and the actual quality of the molten iron in the ladle;

[0045] (2) Add the granular iron recovered after the prior art treatment into molten iron, and the amount of granular iron added is limited by mass according to the following formula:

[0046] M=(T 1 -T 2 )·M 1 ·K / T 2

[0047] Among them, K is the correction coefficient; K=0.1~0.5;

[0048] where T 1 is the actual temperature of molten iron entering the station, T 2 is the target temperature of KR process, M 1 is the actual molten iron quality of the ladle, and M is the added quality of granular iron;

[0049] (3) During the stay of the iron ladle, use the excess heat energy in the iron ladle to complete the melting process of granular...

Embodiment 2

[0053] Others are the same as embodiment 1, the difference is:

[0054] A large domestic iron and steel group has built a KR molten iron desulfurization treatment station. The temperature of the molten iron exiting the blast furnace is 1430-1440°C, the actual amount of molten iron in the ladle is 120t, the target temperature of the molten iron in the KR process is 1380°C, the coefficient K=0.16, and the added particle size is 21mm granulated iron 700KG, after 20 minutes the granulated iron absorbs the temperature of the molten iron and then melts. After the granulated iron melts, the temperature of the molten iron is 1380-1385°C

Embodiment 3

[0056] Others are the same as embodiment 1, the difference is:

[0057] A large domestic iron and steel group has built a KR molten iron desulfurization treatment station. The temperature of the molten iron exiting the blast furnace is 1440-1450°C. The actual amount of molten iron in the ladle is 100t. The target temperature of the molten iron in the KR process is 1380°C. The coefficient K=0.19. The added particle size is 25mm granulated iron 850KG, after 20 minutes the granulated iron absorbs the temperature of the molten iron and then melts. After the granulated iron melts, the temperature of the molten iron is 1380-1385°C

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Abstract

The invention belongs to granular iron recycling in the field of comprehensive utilization of slag from a steel plant, and relates to a method for recycling granular iron and stabilizing temperature of a KR procedure. According to a difference between an actual temperature of molten iron from a blast furnace and a target temperature of the KR procedure, granular iron is added to ladle, so as to realize control on the temperature of the molten iron. The method not only realizes recycling of granular iron but also utilizes surplus heat of molten iron, stabilizes the temperature of the molten iron and reduces usage of a cooling material; meanwhile, the method improves the yield of molten iron, achieves many things at one stroke by improving heat and material utilization rate and reducing product cost, and has high economic benefit.

Description

technical field [0001] The invention belongs to the recycling content of granular iron in the field of comprehensive utilization of steel slag in iron and steel plants, and relates to a method for recycling granular iron and stabilizing the temperature of the KR process, and is particularly suitable for the granular iron recycling method of the KR process. Background technique [0002] my country is a big country in steel production, with a steel output as high as 700 million tons. Accompanied by the steel production process every year, a large amount of secondary smelting slags of various types are produced, and the total amount accounts for about 15% to 20% of the steel output, or even more. The slag contains a large amount of metal elements such as iron and useful elements such as calcium oxide, which is valuable for recycling, but at the same time, it is accompanied by a large number of harmful elements such as phosphorus and sulfur, which brings adverse effects on recyc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C21C7/06
CPCY02P10/20Y02W30/50
Inventor 张冠锋王博刘美刘洪银马琳杨州孙会朝刘超张炯
Owner LAIWU IRON & STEEL GRP