Fluorine-containing and manganese-containing slag system for blast furnace smelting

A technology of blast furnace smelting and manganese slag, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as gas flow distribution disturbance, economic loss, and furnace condition deterioration, and achieve good fluidity, promote rationalization, and promote rapid recovery.

Inactive Publication Date: 2019-11-12
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above reasons will easily lead to poor air permeability and liquid permeability of the blast furnace reflow zone and central dead material column, which will further make it difficult to control the blast furnace gas flow
When the effective volume of the blast furnace exceeds 1200m3, the diameter of the blast furnace hearth increases, and it is more difficult to blow through the center column area of ​​the blast furnace for smelting high-titanium vanadium-titanium magnetite; The internal air distribution of the furnace is disrupted, which often makes it difficult for the blast furnace to return to the normal production level after re-airing, and even the furnace condition deteriorates for a long time, causing economic losses of tens of millions of yuan for the enterprise.

Method used

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  • Fluorine-containing and manganese-containing slag system for blast furnace smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A blast furnace smelted with vanadium-titanium magnetite as the main raw material has a tapping capacity of 280-350t / time, a slag volume of 180-230t / time, and a slag yield of about 580kg-660kg per ton of iron. During its normal production period, the composition of the slag is the same as that of the JZ experimental group in Table 1. In the laboratory, chemically pure reagents are used to design and prepare slag samples according to the experiments of Groups 1 to 4 in Table 1. The RTW-10 high temperature melt physical property tester is used to test Experimental group slag metallurgical performance is tested in table 1, and its result is as follows figure 1 and shown in Table 2.

[0022] Table 1 slag composition

[0023] CaO SiO 2

MgO Al 2 o 3

TiO 2

MnO CaF 2

R 2

JZ 30.02 28.05 6.86 13.14 21.30 0.63 0.00 1.07 1 31.98 29.89 7.50 13.00 17.00 0.63 0.00 1.07 2 30.94 30.94 7.50 13.00 17.00 0.63...

Embodiment 2

[0029] After the blast furnace A, which uses vanadium-titanium magnetite as the main raw material, was opened in early 2019, the gas flow distribution was unstable, and the hearth frequently bonded and piled up in the center of the hearth. Affected by the reduction of the effective working volume of the hearth, the disorder of the gas flow distribution in the blast furnace is aggravated. After taking measures, the slag system composition is adjusted to the slag system provided by the present invention (seeing 3# composition in table 2), and its metallurgical performance test is shown in figure 2 Middle 20190219 South Slag and North Slag are shown.

[0030] Table 2 slag components

[0031] CaO SiO 2

MgO al 2 o 3

TiO 2

MnO CaF 2

R 2

1#-20150324 25.88 25.49 7.92 13.51 22.39 0.65 0.328 1.02 2#-20190121 27.27 26.6 6.95 13.16 19.07 1.2 -- 1.03 3#-20190219 29.01 29.33 7.86 12.38 16.78 1.3 2.77 0.99 ...

Embodiment 3

[0035]In B blast furnace smelting vanadium-titanium magnetite as the main raw material, in June 2017, during the re-airing process after the tuyeres were replaced, the air flow was turbulent and difficult to control, and the condition of the furnace continued to deteriorate. According to analysis and judgment, central accumulation and edge bonding appeared in the furnace at the same time. In the early stage, manganese ore was added to improve the furnace condition. The proportion of manganese ore was gradually increased from 2% to 7%, and the MnO content in slag increased from 0.63% to 3.5%-4%. The airflow in the furnace was still turbulent and difficult to control. Since MnO is more difficult to reduce than iron oxides, and the TFe of manganese ore is lower than that of lump ore, with the substantial increase in the ratio of manganese ore, the grade of blast furnace raw materials will be further reduced, the amount of slag will be further increased, and the reduction of MnO in...

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Abstract

The invention belongs to the technical field of vanadium titano-magnetite blast furnace ironmaking, and particularly relates to a fluorine-containing and manganese-containing slag system for blast furnace smelting. The fluorine-containing and manganese-containing slag system is composed of the following components including, by weight, 16%-19% of TiO2, 7%-8% of MgO, 12%-14% of Al2O3, 1.0%-1.5% ofMnO, 2.0%-3.0% of CaF2 and the balance CaO and SiO2, wherein the mass ratio of the CaO to the SiO2 is (0.95-1.05):1. The slag system can effectively reduce the melting temperature of slag, so that theslag has better fluidity at the lower temperature, adverse impacts of the position of the high-titanium blast furnace slag on gas permeability and liquid permeability of the parts, where a material column reflow zone and a hearth center position are located, of a material column, rational distribution of blast furnace gas flow is promoted, and rapid recovery of blast furnace conditions is promoted.

Description

technical field [0001] The invention belongs to the technical field of vanadium-titanium-magnetite blast furnace ironmaking, and in particular relates to a fluorine-containing manganese-containing slag system for blast furnace smelting. Background technique [0002] Appropriate slagging system is one of the basic conditions to realize the stable and smooth operation of the blast furnace. For the blast furnace smelting of high-titanium vanadium-titanium magnetite, there are characteristics such as low grade iron into the furnace, high low-temperature pulverization rate of sintered ore, and large amount of iron slag produced per ton. The slag TiO produced in the blast furnace smelting process 2 High content, high melting temperature, TiO in slag 2 It is easy to be over-reduced by coke to form high melting point phases such as Ti(C,N) and deteriorate the fluidity of slag and iron. The above-mentioned reasons easily lead to poor air permeability and liquid permeability of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/04
CPCC21B5/04
Inventor 郑魁付卫国谢洪恩
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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