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A method to reduce blast furnace slag ratio

A blast furnace slag and blast furnace slag technology are applied in the field of reducing blast furnace slag ratio, and can solve the problems of affecting blast furnace smelting efficiency, increasing furnace resistance, increasing slag ratio, and the like

Inactive Publication Date: 2017-07-18
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, with the depletion of high-grade iron ore, more and more low-grade iron ore is used in blast furnaces for smelting, which directly leads to a significant increase in the slag ratio and increased resistance in the furnace, which seriously affects the performance of the blast furnace. Smelting efficiency

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  • A method to reduce blast furnace slag ratio
  • A method to reduce blast furnace slag ratio
  • A method to reduce blast furnace slag ratio

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Experimental program
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Effect test

Embodiment 1

[0028] The composition of raw materials and fuels for blast furnace ironmaking in a steel plant is shown in Table 2. Blast furnace smelting conditions: coke ratio is 400kg / t 铁 , Coal ratio is 150kg / t 铁 The charge structure of the blast furnace is that the amount of iron brought in by the mixed iron ore powder used for sintering accounted for 80%, the amount of iron brought in by pellets accounted for 15%, and the iron ore brought in by natural lump ore accounted for 5%.

[0029] The components of the blast furnace slag are CaO=39.57%, SiO 2 =33.25%, Al 2 o 3 =15.88% and MgO=11.30%, the slag ratio is 305.6kg / t 铁 . Using the method of the present invention, without changing the above smelting conditions, the components of the blast furnace slag are adjusted to CaO=22.89%, SiO 2 =37.54%, Al 2 o 3 = 17.94% and MgO = 21.63%. The melting point and viscosity of the slag before and after the adjustment are equal, and the slag ratio is reduced to 270.6kg / t after the adjustment...

Embodiment 2

[0033] The composition of raw materials and fuels for blast furnace ironmaking in a steel plant is shown in Table 2. Blast furnace smelting conditions: coke ratio is 400kg / t 铁 , Coal ratio is 150kg / t 铁 The charge structure of the blast furnace is that the amount of iron brought in by the mixed iron ore powder used for sintering accounted for 100%, the amount of iron brought in by pellets accounted for 0%, and the iron ore brought in by natural lump ore accounted for 0%.

[0034] The components of the blast furnace slag are CaO=39.45%, SiO 2 =33.15%, Al 2 o 3 =15.73% and MgO=11.67%, the slag ratio is 328.0kg / t 铁 . By adopting the method of the present invention, without changing the above smelting conditions, the composition of the slag is adjusted to CaO=23.24%, SiO 2 =37.49%, Al 2 o 3 = 17.79% and MgO = 21.48%. The melting point and viscosity of slag before and after adjustment are equal, and the slag ratio after adjustment is reduced to 290.0kg / t 铁 , a decrease of ...

Embodiment 3

[0036] The composition of raw materials and fuels for blast furnace ironmaking in a steel plant is shown in Table 2. Blast furnace smelting conditions: coke ratio is 400kg / t 铁 , Coal ratio is 150kg / t 铁 The charge structure of the blast furnace is that the amount of iron brought in by the mixed iron ore powder used for sintering accounted for 90%, the amount of iron brought in by pellets accounted for 10%, and the iron ore brought in by natural lump ore accounted for 0%.

[0037] The original blast furnace slag components of the blast furnace are CaO=39.60%, SiO 2 =33.25%, Al 2 o 3 =15.71% and MgO=11.44%, the slag ratio is 315.6kg / t 铁 . Using the method provided by the present invention, without changing the above smelting conditions, the composition of blast furnace slag is adjusted to CaO=22.89%, SiO 2 =37.52%, Al 2 o 3 = 17.74% and MgO = 21.85%. The melting point and viscosity of slag before and after adjustment are equal, and the slag ratio after adjustment is redu...

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Abstract

The invention provided a method for lowering a blast furnace slag ratio. The method comprises the steps that in the blast furnace smelting process, the blast furnace slag ratio is lowered by adjusting the content of CaO and MgO in a flux added to a blast furnace to make the mass ratio of CaO to SiO2 be 0.55-0.78, and the mass ratio of MgO to CaO be 0.70-1.10 in the blast furnace slag under the circumstances that the matching ratio of crude fuel, and the melting point and the viscosity of blast furnace slag are not changed. According to the method for lowering the blast furnace slag ratio, the blast furnace slag ratio is lowered effectively on the basis that the existing matching ratio of iron ore, coke, coal powder and other crude fuel, and the melting point and the viscosity of blast furnace slag are not changed.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting and provides a method for reducing the ratio of blast furnace slag. Background technique [0002] The blast furnace ironmaking process has the advantages of high energy utilization efficiency and large output, and is currently the dominant ironmaking method in the world. But at present, as the whole society pays more and more attention to the issue of sustainable development, blast furnace ironmaking is facing more and more severe pressure on energy and resources. On the one hand, blast furnace ironmaking accounts for about 65% of the energy consumption of the entire steel production process. Under the severe global warming and energy shortage situation, blast furnaces are facing huge pressure to save energy and reduce emissions. On the other hand, with the depletion of high-grade iron ore, more and more low-grade iron ore is used in blast furnaces for smelting, which directly lead...

Claims

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Application Information

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IPC IPC(8): C21B5/04
Inventor 干磊
Owner JIANGXI UNIV OF SCI & TECH
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