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Technological method for preparing metallized hot pellets by waste heat of submerged arc furnace

A process method and submerged arc furnace technology, applied in furnaces, electric furnaces, waste heat treatment, etc., can solve the problems of complex overall process, high energy consumption, long production cycle, etc., achieve short and practical process, reduce energy consumption and cost low effect

Inactive Publication Date: 2021-01-29
新疆吉泰低阶煤利用研究有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Metallized pellets are raw materials for submerged arc furnace smelting. They are mixed and stirred by ore powder, reducing agent and flux according to the proportion. Gas and other energy sources are used for heating, sintering or reduction into pellets with a high metallization rate. The overall process is complex, the process is long, and the production cycle is long. In the prior art, the metal pellets are usually put into the furnace in a cold state. The energy consumption is relatively high, and at the same time, the waste heat flue gas from the submerged arc furnace cannot be fully utilized in the sintering process of metallized pellets

Method used

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  • Technological method for preparing metallized hot pellets by waste heat of submerged arc furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The reducing agent in the reducing agent bin, the mineral powder in the mineral powder bin and the flux in the flux bin are transported to the mixing mixer through the screw feeder. The ratio of mineral powder, reducing agent and flux is 55:25:20 , And the particle size of mineral powder, reducing agent and flux is 0.3~1.2mm;

[0034]Use a mixing mixer to mix the mineral powder, reducing agent, and flux evenly. The rotation speed of the mixing mixer is 50r / min, and the mixing time is 30min;

[0035]Introduce the mixed powder into a high-pressure ball press to form a compact, and shape it into a high-pressure briquette pellet. The spindle speed of the high-pressure ball press is 12r / min and the molding pressure is 33MPa;

[0036]The high-pressure briquette pellets are fed into the pellet heating device, and the negative pressure exhaust fan connected to the pellet heating device introduces the high temperature flue gas generated during the operation of the submerged arc furnace into the...

Embodiment 2

[0041]The reducing agent in the reducing agent bin, the mineral powder in the mineral powder bin and the flux in the flux bin are transported to the mixing mixer through the screw feeder. The ratio of mineral powder, reducing agent and flux is 60:21:19 , And the particle size of mineral powder, reducing agent and flux is 0.5~1.1mm;

[0042]Use a mixing mixer to mix the mineral powder, reducing agent, and flux evenly. The rotation speed of the mixing mixer is 60r / min, and the mixing time is 30min;

[0043]Introduce the mixed powder into a high-pressure ball press to form a compact, and shape it into a high-pressure briquette pellet. The spindle speed of the high-pressure ball press is 12r / min and the molding pressure is 35MPa;

[0044]The high-pressure briquette pellets are fed into the pellet heating device, and the negative pressure exhaust fan connected to the pellet heating device introduces the high temperature flue gas generated during the operation of the submerged arc furnace into the...

Embodiment 3

[0049]The reducing agent in the reducing agent bin, the mineral powder in the mineral powder bin and the flux in the flux bin are transported to the mixing mixer through the screw feeder. The ratio of mineral powder, reducing agent and flux is 53:21:26 , And the particle size of mineral powder, reducing agent and flux is 0.1~0.9mm;

[0050]Use a mixing mixer to mix the mineral powder, reducing agent, and flux evenly. The rotation speed of the mixing mixer is 75r / min, and the mixing time is 30min;

[0051]Introduce the mixed powder into a high-pressure ball press to form a compact, and shape it into a high-pressure briquette pellet. The spindle speed of the high-pressure ball press is 10r / min and the molding pressure is 37MPa;

[0052]The high-pressure briquette pellets are fed into the pellet heating device, and the negative pressure exhaust fan connected to the pellet heating device introduces the high-temperature flue gas generated during the operation of the submerged arc furnace into the...

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Abstract

The invention discloses a technological method for preparing metallized hot pellets by waste heat of a submerged arc furnace. The technological method comprises the following steps: step I, uniformlymixing and stirring mineral powder, a reducing agent and a fluxing agent to obtain mixed powder; step II, introducing the mixed powder into a high-pressure ball press machine for briquetting forming to prepare high-pressure briquetting pellets; and step III, conveying the high-pressure briquetting pellets into a pellet heating device, communicating with a feed pipe of the submerged arc furnace, through a conveyor. According to the technological method for preparing the metallized hot pellets by the waste heat of the submerged arc furnace disclosed by the invention, the whole technological process is short and practical, and the smelting duration of the metallized pellets is shortened; meanwhile, since the metallized hot pellets are put into the furnace in a hot state, energy consumption generated after cold-state metallized pellets are put into the furnace conventionally is reduced, and moreover, since production of the metallized hot pellets is carried out by utilizing the high-temperature flue gas exhausted by the feed pipe, the energy consumption in the conventional metallized pellet manufacturing is reduced, and therefore, the cost of the metallized hot pellets manufactured bythe method is low.

Description

Technical field[0001]The invention relates to the technical field of utilization of waste heat of a submerged arc furnace, in particular to a process method for preparing metallized thermal pellets from the waste heat of a submerged arc furnace.Background technique[0002]Submerged arc furnaces produce a large amount of waste heat flue gas during operation, and the temperature is as high as 1000 ℃. For these high temperature waste heat, a number of submerged arc furnace waste heat utilization technologies have been implemented in China: for example, patent number CN201721138055.4 submerged arc furnace flue gas waste heat recovery The system directly exchanges heat with the high-temperature flue gas through three water tanks, and the waste heat is recovered and then passed into the waste heat boiler. At the same time, the water divider and the air divider increase the heat exchange time and improve the waste heat recovery rate; patent number CN201920343146.4一This is a submerged arc fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02F27D17/00C21B13/12
CPCC22B1/2406C22B1/02F27D17/004C21B13/12C21B13/0006
Inventor 严铂鑫严瑞山樊方王志涛蔡武
Owner 新疆吉泰低阶煤利用研究有限责任公司
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