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Slag removing and furnace protecting agent

A furnace protection agent and slag conditioning technology, applied in the direction of manufacturing converters, etc., can solve the problems of poor slag splash protection effect, secondary oxidation of molten steel, increase of oxide inclusions, etc., so as to solve the problem of slag adsorption of molten steel inclusions , The effect of solving the erosion problem and prolonging the service life

Inactive Publication Date: 2009-08-12
江西华东实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The slag at the early stage (finish) of converter steelmaking and the slag at the end have strong oxidation and low magnesium oxide content, which will affect the splashing in the early stage of smelting, the slag erosion of the furnace lining during the smelting process, and the effect of slag splashing to protect the furnace, shortening the service life of the lining and tapping The life of the mouth, especially the slag with strong oxidation, has poor adsorption performance of molten steel inclusions. The slag in the tapping process is easy to cause secondary oxidation of molten steel, and the oxide inclusions in molten steel increase, which affects the purity and quality of molten steel.
In the past, the appropriate addition of magnesium-containing materials during the smelting process only increased the content of magnesium oxide in the slag, but could not reduce the oxidation of the slag, and the effect of slag splashing to protect the furnace was not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1: Get 45kg of magnesium oxide, 6kg of calcium oxide, 5kg of carbon, 5kg of aluminum oxide, and 1kg of rhenium, mix them evenly, and shape and select granules in a material maker to make spheroids with a diameter of 10-13mm.

Embodiment 2

[0007] Embodiment 2: Get 80kg of magnesium oxide, 22kg of calcium oxide, 20kg of carbon, 12kg of aluminum oxide, and 4kg of rhenium, mix them uniformly, and shape and select granules in a material maker to make spherical bodies with a diameter of 10-13mm.

Embodiment 3

[0008] Embodiment 3: Get magnesia 62.5kg, calcium oxide 14kg, carbon 12.5kg, aluminum sesquioxide 8.5kg, rhenium 2.5kg, mix evenly, in the feeder, shape and granulate, make diameter be 10-13mm spherical shape body.

[0009] How to use: In the first step, add to the furnace top silo. Transported to the top bunker by belt. The converter operator controls the addition of slag adjustment and furnace protection agent. At the beginning of converter smelting, add slag adjusting and protecting agent with 5-15% of lime content along with the first batch of lime. 50-150kg; at the end of smelting, add 100-300kg of slag adjusting and protecting agent, the specific addition amount depends on the slag magnesium oxide, in order to achieve 8-11% of the final slag magnesium oxide; . The second step: manual input. The small bags are packed behind the converter furnace and thrown by the furnace chief or the furnace front worker. During the tapping process of the converter, the slag is put ...

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Abstract

A slag adjustment and furnace protection agent, which is composed of the following raw materials in weight percentages: magnesium oxide 45-80%, calcium oxide 6-22%, carbon 5-20%, aluminum oxide 5-12%, rhenium 1-4% , and its preparation method is: weigh the above raw materials in proportion, mix them uniformly, shape and granulate in a granulator, and make spheroids with a diameter of 10-13mm. The advantages of the invention are: (1) solve the problem of splashing in the early stage of smelting; (2) solve the problem of slag erosion on the furnace lining in the smelting process; (3) solve the problem of slag adsorption of molten steel inclusions; (4) extend the (5) Improve the effectiveness of slag splashing to protect the furnace.

Description

technical field [0001] The invention relates to the adjustment of converter steelmaking slag system, in particular to a slag adjusting and furnace protecting agent. Background technique [0002] The slag at the early stage (end) of converter steelmaking and the slag at the end have strong oxidation and low magnesium oxide content, which will affect the splashing in the early stage of smelting, the slag erosion of the furnace lining during the smelting process, and the effect of slag splashing to protect the furnace, shortening the service life of the furnace lining and tapping In particular, the slag with strong oxidizing properties has poor performance in absorbing molten steel inclusions. The slag in the tapping process is easy to cause secondary oxidation of molten steel, and the oxide inclusions in molten steel increase, which affects the purity and quality of molten steel. In the past, the appropriate addition of magnesium-containing materials during the smelting proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 李小勇唐民生
Owner 江西华东实业有限公司