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Silicon carbide pellet and purpose of pellet as temperature improving agent in converter smelting process

A technology of silicon carbide pellets and silicon carbide balls, which is applied in the manufacture of converters, etc., can solve the problems of high oxygen activity, high cost, and high iron content at the end point of molten steel, and achieve faster production and smelting cycles, simple addition methods, and increased production. Effect of Scrap Consumption

Inactive Publication Date: 2013-08-14
PANZHIHUA GANGCHENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, due to the smelting process of most steel mills, the temperature of molten steel in converter smelting is low, and the content of sulfur and phosphorus is relatively high. Steelmaking often requires repeated oxygen blowing due to insufficient heat. Most furnaces are based on the terminal iron oxide. Reaching a sufficient tapping temperature will result in high oxygen activity in the final molten steel and high total iron content in the slag, which will have an adverse effect on the smelted steel type and the furnace life of the converter, and is not conducive to the economy of steelmaking
[0003] At present, the commonly used methods in the thermal compensation technology of converter steelmaking in China have used coke, anthracite and other heating materials successively, but they have been eliminated one after another due to relatively large defects. The carbon content of the steel has also played a certain role in alleviating the lack of heat sources for semi-steel steelmaking, but its pertinence is not strong and the cost is high

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  • Silicon carbide pellet and purpose of pellet as temperature improving agent in converter smelting process

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preparation example Construction

[0034] The preparation method of above-mentioned silicon carbide pellets comprises the steps:

[0035] a. Mix 85-90 parts of silicon carbide powder, 5-10 parts of lime, and 1-3 parts of binder according to the weight ratio;

[0036] Too much silicon carbide powder will lead to poor ball formation, and too low will make it unable to achieve the heating effect;

[0037] If the amount of lime is too much, it will cause more dust during the use of the pressed pellets, which will affect the yield of calcium oxide. If it is too small, it will not be able to moderately increase the alkalinity of the slag during the use of the converter;

[0038] The role of the binder is to ensure that the low-sulfur silicon carbide powder and lime are mixed and pressed into balls.

[0039] Since the silicon carbide pellets may burst and slag splash if the moisture is too high during use, the silicon carbide pellets for steelmaking in the present invention need to control the moisture content to be ...

Embodiment 1

[0058] Embodiment 1 Preparation and use of silicon carbide spheres of the present invention

[0059] Commercially available sodium carboxymethyl cellulose, Guangxi white clay, commercially available dextrin, commercially available sodium carbonate, and commercially available sodium bentonite are proportioned by weight at 7% carboxymethyl cellulose sodium, Guangxi white clay 63%, and commercially available 15% of commercially available dextrin, 10% of commercially available sodium carbonate and 5% of sodium bentonite are uniformly mixed to prepare the binder.

[0060] Then weigh 88 parts by weight of low-sulfur silicon carbide powder, 10 parts by weight of lime powder and 2 parts by weight of binder. Then send the weighed silicon carbide powder and lime powder into the mixing mixer for mixing and stirring. After mixing and stirring for 2 minutes, add the binder and continue mixing and stirring for 2 minutes, then add water and stir evenly. Wherein, the amount of water is 8% o...

Embodiment 2

[0067] Embodiment 2 Preparation and use of silicon carbide spheres of the present invention

[0068] Commercially available sodium carboxymethyl cellulose, Guangxi white clay, commercially available dextrin, commercially available sodium carbonate, and commercially available sodium bentonite are proportioned by weight of carboxymethyl cellulose sodium 6%, Guangxi white clay 64%, commercially available 16% of commercially available dextrin, 8% of commercially available sodium carbonate, and 6% of sodium bentonite were uniformly mixed to prepare the binder.

[0069] Then weigh 89 parts by weight of low-sulfur silicon carbide powder, 10 parts by weight of lime powder and 1 part by weight of binder. Then send the weighed silicon carbide powder and lime powder into the mixing mixer for mixing and stirring. After mixing and stirring for 2 minutes, add the binder and continue mixing and stirring for 2 minutes, then add water and stir evenly. Wherein, the amount of water is 8% of th...

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Abstract

The invention which belongs to the technical field of steel making concretely relates to a silicon carbide pellet and a purpose of the pellet as a temperature improving agent in the converter smelting process. The silicon carbide pellet provided in the invention is prepared from the following raw materials, by weight, 85-90 parts of silicon carbide powder, 5-10 parts of lime and 1-3 parts of a binder. When the pellet is used as the novel temperature improving agent in the converter smelting process, 7-11kg of the silicon carbide pellet is added to 1t of molten steel, the melting time is 20-30s, and the temperature is heated by above 40DEG C. The pellet which has the advantages of fast melting, good temperature improving effect and convenient operation can replace present thermo compensation materials of coke, anthracite and the like.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to silicon carbide pellets and their application as a temperature raising agent in a converter smelting process. Background technique [0002] With the development of the iron and steel industry, the iron and steel industry has put forward higher and higher requirements for steelmaking productivity and steel cost. At present, due to the smelting process of most steel mills, the temperature of molten steel in converter smelting is low, and the content of sulfur and phosphorus is relatively high. Steelmaking often requires repeated oxygen blowing due to insufficient heat. Most furnaces are based on the terminal iron oxide. Reaching a sufficient tapping temperature will result in high oxygen activity of the end point molten steel and high total iron content in the slag, which will have a negative impact on the smelted steel type and the converter furnace life, and is no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C22B1/24
Inventor 青光红陈涛吴胜利郭仁孝郑德明
Owner PANZHIHUA GANGCHENG GROUP
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