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A blast furnace smelting method based on high theoretical combustion temperature and low fuel ratio

A theoretical combustion temperature and blast furnace smelting technology, applied in the field of blast furnace smelting, can solve the problems of blast furnace utilization coefficient and low comprehensive fuel ratio, and achieve the effects of increasing output, improving stability and reducing Si content in pig iron

Active Publication Date: 2022-02-08
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Large-scale use of Yunnan local and surrounding areas such as vanadium-titanium ore, coke with high ash content, sulfur content, and coal powder, with a furnace grade of 52.0-55.0%, adopts a theoretical combustion temperature > 2500 ° C, and a coal ratio > 120kg / t iron , w(TiO 2 )3.50~17.00% for low-silicon and low-sulfur blast furnace smelting to obtain a higher blast furnace utilization factor and a lower comprehensive fuel ratio, but there is no relevant literature report

Method used

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  • A blast furnace smelting method based on high theoretical combustion temperature and low fuel ratio
  • A blast furnace smelting method based on high theoretical combustion temperature and low fuel ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The blast furnace smelting method based on the high theoretical combustion temperature and low fuel ratio of the present embodiment goes through the following steps:

[0037] A. The ore with the following mass ratio:

[0038] High alkalinity sinter 67%, small particle size high alkalinity sinter 1%, high silicic acid oxidizing pellets 27%, vanadium titanium pellets 0%, natural lump ore 5%, the sum of the above minerals is 100% , and coke with higher ash and sulfur content are sent into the blast furnace according to the coke load of 4.17.

[0039] The coke in this example has a CRI65%.

[0040] The chemical composition of high alkalinity sinter and small particle size sinter is: TFe52.88%, SiO 2 5.40%, CaO12.720%, MgO2.74%, TiO 2 0.364%, S 0.044%, Al 2 o 3 2.095%, MnO0.960%, FeO7.56%. The main physical properties of the sintered ore are: the ISO drum index is 82.0%, and the average particle size is 28 mm; the average particle size of the small-sized sintered or...

Embodiment 2

[0051] The blast furnace smelting method based on the high theoretical combustion temperature and low fuel ratio of the present embodiment goes through the following steps:

[0052] A. The ore with the following mass ratio:

[0053]High alkalinity sinter 64%, small particle size high alkalinity sinter 3%, high silicic acid oxidizing pellets 16%, vanadium titanium pellets 15%, natural lump ore 2%, the sum is 100%, and relatively Coke with high ash and sulfur content is sent into the blast furnace according to the coke load of 4.14.

[0054] The chemical composition of high alkalinity sinter and small particle size sinter is: TFe53.01%, SiO 2 5.532%, CaO12.204%, MgO2.827%, TiO 2 0.801%, S 0.050%, Al 2 o 3 2.107%, MnO0.7510%, FeO7.921%. The main physical properties of the sintered ore are: the ISO drum index is 81.6%, and the average particle size is 26 mm; the average particle size of the small-sized sintered ore is 7 mm.

[0055] The chemical composition of high silici...

Embodiment 3

[0064] The blast furnace smelting method based on the high theoretical combustion temperature and low fuel ratio of the present embodiment goes through the following steps:

[0065] A. The ore with the following mass ratio:

[0066] High alkalinity sinter 60%, small particle size high alkalinity sinter 4%, high silicic acid oxidizing pellets 0%, vanadium titanium pellets 36%, natural lump ore 0%, the sum of the above is 100%, and Coke with higher ash and sulfur content is sent into the blast furnace according to the coke load of 4.17.

[0067] The chemical composition of high alkalinity sinter and small particle size sinter is: TFe52.05%, SiO 2 5.850%, CaO11.86%, MgO3.03%, TiO 2 1.973%, S 0.066%, Al 2 o 3 2.18%, MnO0.45%, FeO7.87%. The main physical properties of the sintered ore are: the ISO drum index is 81.0%, and the average particle size is 26 mm; the average particle size of the small-sized sintered ore is 6 mm.

[0068] The chemical composition of vanadium tita...

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Abstract

The invention relates to a blast furnace smelting method based on high theoretical combustion temperature and low fuel ratio, which includes the following steps: raw material preparation; smelting; obtaining low-silicon and low-sulfur qualified pig iron. The invention can realize the smelting effects of long-period and stable blast furnace conditions, steady improvement of utilization coefficient, and continuous reduction of comprehensive fuel ratio compared with the same period of last year, and further reduces the cost of pig iron smelting and preparation.

Description

technical field [0001] The invention relates to a blast furnace smelting method, in particular to a blast furnace smelting method based on high theoretical combustion temperature and low fuel ratio, and belongs to the field of blast furnace smelting. Background technique [0002] In the production process of iron and steel complexes, the cost of pig iron smelting accounts for 70-75% of the total cost per ton of material, and the cost of raw and fuel for pig iron accounts for more than 90% of the cost of pig iron. Therefore, in the current stage where raw material and fuel production conditions are gradually deteriorating, adopting a new blast furnace smelting operation concept to increase blast furnace output and reduce the overall fuel ratio under the same conditions has become the main direction of further reducing pig iron preparation costs and enhancing the competitiveness of iron and steel enterprises. [0003] As the inventor is located in the inland area of ​​Yunnan, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 林安川吴仕波罗英杰刘宁斌胡兴康汪勤峰李轶李吉能王亚力夏海英
Owner WUKUN STEEL
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