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Iron ore powder reducing device, molten iron and reduced iron producing device and method for same

A manufacturing method and technology for manufacturing equipment, applied in the fields of reduced iron and molten iron manufacturing equipment, and fine iron ore reduction devices, can solve the problems of restricting the use of low-grade ore and low gangue separation efficiency, so as to improve competitiveness, reduce capacity, The effect of increasing the separation efficiency

Inactive Publication Date: 2014-12-03
POSCO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In this Chinese patent, all gangues are separated regardless of large particles and ultra-fine powders, so the magnetic separation processing capacity increases proportionally to the charging capacity, and its scale is very large. Since large-grained ores with low gangue content are processed together, The separation efficiency of gangue is very low
[0006] Moreover, in the fluidized bed reduction process, the gangue component is separated and removed only in the reduction step of magnetite, and if the gangue component is not removed in this step, it will be contained in reduced iron and molten iron, thereby limiting the Use of grade ore

Method used

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  • Iron ore powder reducing device, molten iron and reduced iron producing device and method for same
  • Iron ore powder reducing device, molten iron and reduced iron producing device and method for same
  • Iron ore powder reducing device, molten iron and reduced iron producing device and method for same

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Embodiment

[0139] The content of the total metallic iron (T.Fe) is 62% and the SiO in the gangue composition 2 The content is 3.76%, Al 2 o 3 The high-grade hematite with a content of 2.23% is mixed with auxiliary raw materials limestone and dolomite, and when the fluidized reduction is carried out in a fluidized bed reduction reactor at a temperature of 450 ° C, the iron ore in the fluidized bed is transformed into It is a reduced ore with a reduction rate of 10%, namely magnetite.

[0140] At this time, in the iron ore in the fluidized bed, silicon dioxide (SiO 2 ) is 3.60%, alumina (Al 2 o 3 ) is 1.65%, while SiO in the superfine powder flying out from the same reactor 2 Increased to 4.50%, Al 2 o 3 Increased to 1.67%, especially, the SiO in the superfine powder that was not caught by the cyclone separator (cyclone) in the reactor and flew away 2 7.80%, Al 2 o 3 was 4.83%, and the gangue content increased significantly.

[0141] Therefore, when the gangue is separated and r...

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Abstract

A reduction apparatus and a reduction method of a fine iron ore are disclosed. The reduction apparatus of the fine iron ore according to the present invention includes: a granulated ore pre-reduction furnace into which the fine iron ore is charged to be pre-reduced by a reduction gas; an ultra-fine ore pre-reduction furnace into which an ultra-fine ore scattered in the granulated ore pre-reduction furnace to be discharged is charged to be pre-reduced; a first magnetic separator separating a gangue component from the ultra-fine ore reduced in the ultra-fine ore pre-reduction furnace and then discharged; at least one intermediate reduction furnace into which the granulated ore reduced in the granulated ore pre-reduction furnace to be discharged and the ultra-fine ore from which the gangue component is separated are charged to be further reduced and thus increase a reduction ratio of the granulated ore and the ultra-fine ore; and a final reduction furnace finally reducing the granulated ore and the ultra-fine ore reduced in the intermediate reduction furnace to be discharged to manufacture a reduced iron.

Description

technical field [0001] The present invention relates to a fine iron ore reduction device, reduced iron including the device and molten iron manufacturing equipment, more particularly, relates to a device capable of simultaneously reducing iron ore and reducing low-grade iron ore. A fine iron ore reduction device for mineral processing, reduced iron and molten iron manufacturing equipment including the device. Background technique [0002] The iron ore used in the existing molten iron manufacturing process is high-grade ore. With the increase in the use of high-grade ore in the world, the high-grade ore is gradually exhausted. The use of high-grade ore is gradually increasing. [0003] Before using this low-grade ore, the gangue component is removed through pre-selection to improve the grade. When using low-grade ore that has not been pre-selected, the gangue content is very high relative to the amount of ore loaded, resulting in a large increase in the amount of slag produ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
CPCC21B13/143C21B13/002C21B13/146Y02P10/134C21B13/00
Inventor 郑善光李相皓尹滋荣
Owner POSCO
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