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A kind of processing method of dri pellet

A processing method and pelletizing technology, applied in the field of DRI pelletizing, can solve the problems of high cost per ton of iron, low recovery rate of reduced ore iron, etc., and achieve high-grade effect

Active Publication Date: 2017-09-29
SHENWU TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the low iron recovery rate of low-grade ore and refractory ore in the prior art, and the high cost per ton of iron.

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  • A kind of processing method of dri pellet
  • A kind of processing method of dri pellet
  • A kind of processing method of dri pellet

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Embodiment Construction

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise specified, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inside" ", "outside", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the inven...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a DRI pellet processing method. The method includes the steps of conducting first-stage ore grinding and strong magnetic separation on a DRI pellet directly reduced and cooled to obtain first-stage iron slag powder and first-stage residues, conducting second-stage ore grinding and weak magnetic separation on the first-stage iron slag powder to obtain reduced iron powder and second-stage residues, mixing the second-stage residues with quick slime, sending the mixture into a high-temperature gas melting separation furnace to separate slag from iron, and obtaining molten iron and furnace slag after discharge. Compared with the prior art, the DRI pellet processing method has the advantages that the reduced iron powder is higher in grade, the TFe content in iron powder is not smaller than 96%, the TFe ratio in residues is smaller than 3%, and the metal recovery rate is increased; meanwhile, the pig-iron cost is reduced, and the pay back period is shortened.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for treating DRI pellets. Background technique [0002] At present, the raw materials for direct reduction ironmaking are generally low-grade ores and refractory ores, etc., with many gangues, the reduction process is solid reduction, and the amount of limestone or quicklime added is small, and the pellets cannot be fully reduced. Iron process and direct reduction ironmaking process have low metallization rate, slag and iron are not easily separated, high iron loss, low product grade, low ironmaking output, and low recovery rate, which in turn affects the economic benefits of ironmaking. [0003] At present, a kind of treatment method of DRI pellets includes "grinding magnetic separation method" and "high temperature gas melting method". Among them, the main problem of the grinding magnetic separation method is that the reduced iron powder produced by this method has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/00C21B13/00
CPCY02P10/20
Inventor 经文波吴道洪薛逊刘占华任中山师为
Owner SHENWU TECH GRP CO LTD
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