Prepraiton method of high-carbon metallized pellets for electric furnace

Abstract

The invention discloses a preparation method of high-carbon metallized pellets for electric arc furnace smelting. The preparation method comprises the steps that carbon-containing powder is added intoiron concentrate for material preparation according to the mass ratio of carbon to iron of 1.5-2:1, prereduction is carried out at a reduction temperature of 1000-1300 DEG C for 40-60min, the reduction product is ground to 0.4-0.5 mm granularity, 4-6% of a binding agent and 9-12% of water are added, the mixture is mixed evenly, pressed into pellets and dried at the temperature of 120-140 DEG C for 60-90min, the high-carbon metallized pellets are obtained, and the pellets can reach the falling strength of 3-4 and reach the density of 2.6-3.3g / cm<3>. Molten steel can be stably and efficiently recarburized by the pellets below the slag-steel interface, the problems that the density of conventional carburant is insufficient, the carburant rapidly floats on the surface of furnace slag after being added, and the carburizing effect is poor are solved, meanwhile, the pellets can perform a good carbon-oxygen reaction below the slag-steel interface to remove inclusions and gas, formation of a large amount of foam slag is promoted, electric arc is stabilized, smelting time is shortened, iron loss is effectively reduced, steel material consumption is remarkably reduced, the metal yield is improved, and the smelting cost is reduced.

Description

Technical field

[0001] The invention belongs to the field of steel metallurgy electric arc furnaces, and specifically relates to a method for preparing high-carbon metallized pellets of pre-reduced iron ore concentrates.

[0002] technical background

[0003] The development of electric arc furnace steelmaking in my country continues to accelerate. Its smelting uses scrap steel as the main raw material. Compared with the blast furnace-converter long process smelting, it has the advantages of short process, low energy consumption and low pollution. It is the current focus of the development of iron and steel enterprises. . At present, converter steelmaking still occupies a dominant position among my country’s steelmaking enterprises. However, with the increase in my country’s scrap production and the reduction in electricity costs, my country’s electric arc furnace steelmaking output has a lot of room for growth, and electric arc furnace smelting conforms to the trend of the metallur...

Examples

Embodiment 1

[0045] Pre-reduced iron ore concentrate high-carbon metalized pellets, the first application of production was carried out in a factory, and the pelletizing experiment was carried out. The production process of high-carbon metalized pellets is as follows:

[0046] 1) Using carbon powder with fixed carbon 96.28, ash content 6.24%, volatile content 5.56, and iron ore concentrate with 65.5% total iron, 6.44% silica, 0.018% phosphorus, and 0.041% sulfur. According to the C / Fe ratio of 1.8:1, do the ingredients and mix them evenly.

[0047] 2) After mixing uniformly, reduce in a rotary kiln at 1200°C for 40 minutes, the obtained metallization rate is 92.73%, and the residual carbon rate is 58.00%.

[0048] 3) Grind the reduction product

[0049] 4) Use bentonite as the binder and mix with water. The amount of binder is 6%, and the amount of water is 12%.

[0050] 5) After mixing uniformly, use a ball press to pelletize, the pressure of the ball press is 1000t.

[0051] 6) Final drying, the ...

Technical field

[0001] The invention belongs to the field of steel metallurgy electric arc furnaces, and specifically relates to a method for preparing high-carbon metallized pellets of pre-reduced iron ore concentrates.

[0002] technical background

[0003] The development of electric arc furnace steelmaking in my country continues to accelerate. Its smelting uses scrap steel as the main raw material. Compared with the blast furnace-converter long process smelting, it has the advantages of short process, low energy consumption and low pollution. It is the current focus of the development of iron and steel enterprises. . At present, converter steelmaking still occupies a dominant position among my country’s steelmaking enterprises. However, with the increase in my country’s scrap production and the reduction in electricity costs, my country’s electric arc furnace steelmaking output has a lot of room for growth, and electric arc furnace smelting conforms to the trend of the metallur...

Examples

Embodiment 1

[0045] Pre-reduced iron ore concentrate high-carbon metalized pellets, the first application of production was carried out in a factory, and the pelletizing experiment was carried out. The production process of high-carbon metalized pellets is as follows:

[0046] 1) Using carbon powder with fixed carbon 96.28, ash content 6.24%, volatile content 5.56, and iron ore concentrate with 65.5% total iron, 6.44% silica, 0.018% phosphorus, and 0.041% sulfur. According to the C / Fe ratio of 1.8:1, do the ingredients and mix them evenly.

[0047] 2) After mixing uniformly, reduce in a rotary kiln at 1200°C for 40 minutes, the obtained metallization rate is 92.73%, and the residual carbon rate is 58.00%.

[0048] 3) Grind the reduction product

[0049] 4) Use bentonite as the binder and mix with water. The amount of binder is 6%, and the amount of water is 12%.

[0050] 5) After mixing uniformly, use a ball press to pelletize, the pressure of the ball press is 1000t.

[0051] 6) Final drying, the ...

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