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A production system for corex shaft furnace coated pellets

A production system and coating technology, which is applied in the field of pellet production equipment, can solve problems such as increased screw feeder workload, high-temperature extrusion force, and difficulty in unloading shaft furnaces, so as to improve the bonding firmness, High degree of automation, effect of suppressing sticking phenomenon

Active Publication Date: 2018-06-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the serious sticking problem of traditional pellets in the smelting process due to the high-temperature extrusion force, which makes it difficult to unload the shaft furnace, increases the operating load of the screw feeder, and reduces the efficiency. A production system for COREX shaft furnace coated pellets is provided

Method used

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  • A production system for corex shaft furnace coated pellets
  • A production system for corex shaft furnace coated pellets
  • A production system for corex shaft furnace coated pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 Shown, the production system of a kind of COREX shaft furnace coated pellet of the present embodiment, this production system comprises roasting furnace 1, conveying mechanism, spraying mechanism and mixing tank 10, wherein, described roasting furnace 1 and ring cooling Zone 2 is conveyed and connected, and the oxidized pellets to be coated in the annular cooling zone 2 are transported by the conveying mechanism. The oxidized pellets obtained after roasting in the roasting furnace 1 are cooled to 100°C in the annular cooling zone 2, and 8- After the qualified particle size of 16mm is transported by the conveying mechanism, the spraying mechanism is located above the conveying mechanism, and the coating mixture in the mixing tank 10 is sprayed to the surface of the oxidized pellets to be coated by the spraying mechanism, so that it can be oxidized A layer of uniform coating is prepared on the surface of the pellets, and the combination between the coating a...

Embodiment 2

[0039] Such as figure 1 Shown, the production system of a kind of COREX shaft furnace coated pellet of the present embodiment, this production system comprises roasting furnace 1, conveying mechanism, spraying mechanism and mixing tank 10, wherein, described roasting furnace 1 and ring cooling Zone 2 is conveyed and connected, and the oxidized pellets to be coated in the ring cooling zone 2 are transported through the conveying mechanism. The spraying mechanism is located above the conveying mechanism, and the paint mixture in the mixing tank 10 is sprayed to the to-be-treated pellet by the spraying mechanism. Coat the surface of the oxidized pellets. The coating in the mixing tank 10 is made of light burnt dolomite, Ca(OH) 2 , anthracite and water mixture, so as to ensure that the cohesion between pellets in the COREX shaft furnace can be effectively suppressed while maintaining a high metallization rate to prevent the reduction of the metallization rate, and the coating mat...

Embodiment 3

[0061] The structure of a production system of a COREX shaft furnace coated pellet of the present embodiment is the same as in Example 1, and the specific steps of using this system to produce coated pellets are:

[0062] (1) Preheat the raw pellets at 900°C for 15 minutes, then place them in the roaster 1 for roasting to form the finished product of oxidized pellets (the main components of the oxidized pellets after roasting are the same as in Example 1), and control the roaster The calcination temperature of 1 is 1280°C, the calcination time is 15min, and the heating rate is 10°C. The main components of the oxidized pellets obtained after calcination are close to those of Example 1.

[0063] (2) The 500g calcined pellets are transported by the conveying mechanism. When the oxidized pellets are transferred from the primary conveying device 301 to the secondary conveying device 302, the coating mixture in the mixing tank 10 is sprayed to the The surface of the pellets, which i...

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Abstract

The invention discloses a production system for coated pellets of COREX shaft furnace and belongs to the technical field of pellet production equipment. The production system comprises a roasting furnace, a conveying mechanism, a spraying mechanism and a mixing tank, wherein the roasting furnace is connected to a circular cooling area in a conveying manner. Oxidized pellets to be coated in the circular cooling area are conveyed through the conveying mechanism. The spraying mechanism is positioned above the conveying mechanism. Through the spraying mechanism, a coating mixed liquor inside the mixing tank is sprayed onto the surface of the oxidized pellets to be coated. By the production system for production of the coated pellets, the caking problem of pellets in a COREX shaft furnace technology can be effectively improved, and the system is also beneficial to direct motion of a COREX pre-reduction shaft furnace and helps raise utilization efficiency of COREX shaft furnace equipment and reduce production cost of direct reduction iron. Caking index of reduced pellets is less than 25%.

Description

technical field [0001] The invention belongs to the technical field of pellet production devices, and more specifically relates to a production system of COREX shaft furnace coated pellets. Background technique [0002] In order to alleviate the severe pressure on resources and environment, since the 1970s, non-blast furnace ironmaking technology has emerged as the times require. Because the traditional long-process technology with blast furnace as the main body is relatively mature, its dominant position is difficult to shake, which makes the non-blast furnace ironmaking technology Development is very slow. However, with the deterioration of resource and environmental problems in recent years, non-blast furnace ironmaking technology without coke has become a development trend. [0003] COREX is a brand-new ironmaking process that uses non-coke raw coal as reducing agent and fuel to produce molten iron. The COREX process cancels the sintering plant and coking plant, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14
CPCC21B13/0006C21B13/14
Inventor 狄瞻霞李正一龙红明孟庆民春铁军王平李家新刘颖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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