Method for inhibiting bonding of pellets in COREX shaft furnace

A technology of pelletizing and shaft furnace, which is applied in the field of suppressing pellet bonding in the COREX shaft furnace, and can solve the problems of affecting the forward movement of the pre-reduction shaft furnace, reducing the efficiency of equipment use, and poor air permeability of the material column, so as to ensure the strength and improve the utilization Efficiency, reduce the effect of pulverization rate

Active Publication Date: 2017-05-03
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the tendency of the pellets in the shaft furnace to bond easily in the existing COREX melting ironmaking process in my country, which leads to poor air permeability of the material column,

Method used

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  • Method for inhibiting bonding of pellets in COREX shaft furnace
  • Method for inhibiting bonding of pellets in COREX shaft furnace
  • Method for inhibiting bonding of pellets in COREX shaft furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 2 As shown, a production device for COREX coated pellets in this embodiment includes a roasting furnace 8, a pelletizing machine 3, a coating material tank 1 and a water inlet pipe 5, wherein the roasting furnace 8 is connected with cooked pellet storage The area 801 is connected, and the cooked ball storage area 801 is connected with the pelletizing machine 3 through the feeding conveyor belt 7, and the pelletizing machine 3 in this embodiment adopts a disc pelletizing machine. The coating material tank 1 is connected to the pelletizing machine 3 through the feeding pipe 2, and the coating material tank 1 is equipped with a solid inhibitor Ca(OH) 2 , and a feeding control valve 201 is provided on the feeding pipe 2 . The nozzle 502 at the end of the water inlet pipe 5 is located above the pelletizer 3, and the end of the water inlet pipe 5 near the nozzle 502 is provided with a flow valve 501, and the nozzle 502 is an atomizing nozzle. The above-menti...

Embodiment 2

[0056] A method of inhibiting pellet bonding in the COREX shaft furnace in this embodiment is to prepare a layer of solid inhibitor on the surface of the pellets after roasting the green pellets to make coated pellets, so that the COREX shaft furnace can be effectively improved. The sticking problem of pellets in the process is beneficial to the smooth operation of the pre-reduction shaft furnace, which improves the utilization efficiency of the COREX shaft furnace equipment and reduces the production cost. The specific steps are:

[0057] (1) Preheat the prepared green pellets at 1000°C for 14 minutes, and then bake them at 1300°C for 13 minutes to form finished oxidized pellets. The main components of the green pellets in this example are shown in Table 2. When the green pellets are formed into pellets, the amount of bentonite added is 1.3%, the water content of the obtained green pellets is 8.0%, and the pelletizing time is 10 minutes.

[0058] The main component (%) of ta...

Embodiment 3

[0068] A method of inhibiting pellet bonding in the COREX shaft furnace in this embodiment is to prepare a layer of solid inhibitor on the surface of the pellets after roasting the green pellets to make coated pellets, so that the COREX shaft furnace can be effectively improved. The sticking problem of pellets in the process is beneficial to the smooth operation of the pre-reduction shaft furnace, which improves the utilization efficiency of the COREX shaft furnace equipment and reduces the production cost. The specific steps are:

[0069] (1) Preheat the prepared green pellets at 900°C for 15 minutes, and then bake them at 1320°C for 12 minutes to form finished oxidized pellets. The main components of the green pellets in this example are shown in Table 4. When the green pellets are formed into pellets, the amount of bentonite added is 1.7%, the water content of the obtained green pellets is 8.0%, and the pelletizing time is 15 minutes.

[0070] The main component (%) of tab...

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Abstract

The invention discloses a method for inhibiting bonding of pellets in a COREX shaft furnace and belongs to the technical field of melt reduction ironmaking. The method comprises (1) roasting green pellets to obtain finished products of oxidized pellets, (2) placing the roasted oxidized pellets into a disc pelletizer, spraying water to wet the pellets, carrying out rotation of the pelletizer along with addition of solid inhibitor powder and spraying of a certain amount of water so that the pellets are uniformly coated with solid inhibitor layers and coated pellets are prepared, and (3) drying the coated pellets, adding the coated pellets into a load reduction furnace and carrying out reduction at a reduction gas temperature of 800-950 DEG C. The method can effectively improve the problem of the agglomeration of the pellets in the COREX shaft furnace process, is beneficial to smooth production of the pre-reduction furnace, improves utilization efficiency of the COREX shaft furnace, and reduces a direct reduction iron production cost. The reduced pellets have a bonding index less than 25%.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction ironmaking, and more specifically relates to a method for suppressing pellet agglomeration in a COREX shaft furnace. Background technique [0002] The blast furnace ironmaking system (including coking, sintering, and blast furnace) has been applied and developed for hundreds of years, and has the advantages of perfect technology, large production capacity, and long equipment life. However, its long process, large investment, serious pollution and poor flexibility, especially the increasing scarcity of coking coal resources in the world, make it difficult to meet the needs of blast furnace ironmaking in terms of quantity and quality, prompting people to develop new ironmaking processes. [0003] Smelting reduction ironmaking is the mainstream non-blast furnace ironmaking process and one of the cutting-edge technologies in the contemporary metallurgical industry. Its development and appli...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24C21B13/02C21B13/14
CPCC21B13/0006C21B13/008C21B13/02C21B13/14C22B1/16C22B1/2406
Inventor 狄瞻霞李正一龙红明王平孟庆民春铁军李家新吴雪健钱立新
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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