Process for refining molten iron by directly using low-grade iron ores

A low-grade iron ore technology, applied in the direction of fluidized bed furnace, etc., can solve the problems of pollution, high energy consumption of molten iron smelting process, reduce cooling and heating, reduce raw material agglomeration process, save energy consumption and pollution Effect

Inactive Publication Date: 2010-03-03
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current process of using lean iron ore to smelt molten iron is magnetization roasting→...

Method used

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  • Process for refining molten iron by directly using low-grade iron ores
  • Process for refining molten iron by directly using low-grade iron ores
  • Process for refining molten iron by directly using low-grade iron ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] see figure 2 , fine iron ore 1, flux 2 are added to the lower part of the roasting fluidized bed 7 from the silo 3 through the feeding pipe 4, and the reducing gas enters the roasting fluidized bed 7 equipped with the hot cyclone separator 6 from the roasting fluidized bed inlet 5 , The inlet gas of the roasting fluidized bed is the outlet gas of the pre-reduction fluidized bed through the hot cyclone 14 . After the fine iron ore 1 is magnetized and roasted in the roasting fluidized bed 7, it is added to the thermal magnetic separator 9 through the feeding pipe 8, and the higher grade fine iron ore obtained by thermal magnetic separation enters the pre-reduction one through the feeding pipe 10. 13 in a fluidized bed. The inlet gas of the pre-reduction primary fluidized bed 13 enters through the gas inlet 15 of the pre-reduction primary fluidized bed, and the inlet gas is the reduction gas obtained by the outlet gas of the pre-reduction secondary fluidized bed 17 throu...

Embodiment 2

[0031] see image 3 , powder iron ore 1, flux 2 are added to the lower part of the roasting fluidized bed 5 from the feed bin 3 through the feeding pipe 4, and the reducing gas enters the roasting fluidized bed 7 from the roasting fluidized bed inlet 5, and the roasting fluidized bed 7 is equipped with The L-shaped return valve 6, the inlet gas of the roasting fluidized bed is the outlet gas of the pre-reduction fluidized bed through the hot cyclone 14. After the fine iron ore 1 is magnetized and roasted in the roasting fluidized bed 7, it is added to the thermal magnetic separator 9 through the feeding pipe 8, and the higher grade fine iron ore obtained by the thermal magnetic separation enters the heating equipment through the feeding pipe 10. The cyclone separator 14 is pre-reduced in the primary fluidized bed 13 . The inlet gas of the pre-reduction primary fluidized bed 13 enters through the gas inlet 15 of the pre-reduction primary fluidized bed, and the inlet gas is the...

Embodiment 3

[0034] see Figure 4 , fine iron ore 1, flux 2 are added to the lower part of the roasting fluidized bed 7 from the silo 3 through the feeding pipe 4, and the reducing gas enters the roasting fluidized bed 7 equipped with the hot cyclone separator 6 from the roasting fluidized bed inlet 5 , The inlet gas of the roasting fluidized bed is the outlet gas of the pre-reduction fluidized bed through the hot cyclone 14 . After the fine iron ore 1 is magnetized and roasted in the roasting fluidized bed 7, it is added to the thermal magnetic separator 9 through the feeding pipe 8, and the higher grade fine iron ore obtained by the thermal magnetic separation enters the heating equipment through the feeding pipe 10. The cyclone 14 is pre-reduced in the primary fluidized bed 13 . After being reduced in the pre-reduction primary fluidized bed 13, fine iron ore is added to the pre-reduction secondary fluidized bed 17 through the feed pipe 16, and the inlet gas of the pre-reduction primary...

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Abstract

The invention provides a process for refining molten iron by directly using low-grade iron ores. The process comprises the following steps that: 1, low-grade iron ores are magnetically roasted in a fluidized bed reactor to obtain iron ores with stronger magnetism; 2, the fine ores obtained after roasting enter a hot magnetic separator to obtain hot iron ores with higher grade by hot magnetic separation; 3, the high-quality hot iron ores, which are obtained by magnetic separation, are added into a pre-reduction multi-stage fluidized bed to obtain pre-reduction iron ores with a higher reductiondegree, wherein the pre-reduction multi-stage fluidized bed is combined by a 2 to 4-stages circulating fluidize bed and a bubbling fluidized bed reactor, and after being reduced by the pre-reduction multi-stage fluidized bed, the metallization rate of the fine ores is over 60 percent; and 4, the pre-reduced iron ores are directly injected in a final reduction furnace or fusion gasification furnaceby a hot-pressed block for final reduction refining so as to obtain the molten iron. In the process, the refining process of the low-grade iron ores is completed by fully using energy in the technological process and the low-grade iron ores avoids repeated heating and cooling when being refined into the molten iron, so the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to a smelting reduction ironmaking process in the field of ironmaking, in particular to a process and a device for directly using low-grade iron ore to smelt molten iron. Background technique [0002] The blast furnace ironmaking process is currently the main ironmaking process, but the overall process of the blast furnace ironmaking process is long, the pollution is serious, and the dependence on coking coal is the bottleneck that the process itself cannot break through. The smelting reduction ironmaking process is expected to overcome the limitations of the blast furnace ironmaking process , in the case of increasingly scarce resources and increasing pressure on environmental protection, the smelting reduction ironmaking process has increasingly highlighted its importance. Moreover, blast furnace ironmaking requires the use of high-grade iron ore resources. With the increasing depletion of rich ore resources, the ironmaking proc...

Claims

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Application Information

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IPC IPC(8): C21B13/00C21B11/00C22B1/02
Inventor 范建峰李维国周渝生李肇毅
Owner BAOSHAN IRON & STEEL CO LTD
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