System and method for utilizing flue gas residual heat of furnace body and efficiently recycling iron-containing resources

Abstract

The invention belongs to the field of metallurgy, particularly relates to a rotary hearth furnace which efficiently utilizes residual heat of flue gas, and a system and a method capable of smelting iron-containing resources at a high temperature through utilizing the rotary hearth furnace, and provides a system and a method for utilizing flue gas residual heat of a furnace body and efficiently recycling iron-containing resources aimed at defects of the prior art. According to the system and the method, through improving the heating mode of the rotary hearth furnace, on one hand, residual heat of flue gas of the rotary hearth furnace is reutilized inside the rotary hearth furnace, and the utilization efficiency of residual heat of flue gas of the rotary hearth furnace is increased; on the other hand, a pellet drying technology before the rotary hearth furnace is eliminated under the precondition that product indexes are not affected, the technological process is shortened, and the equipment investment is reduced; and the system and the method have the characteristics that the utilization rate of residual heat of flue gas is high, the treatment process is short, the equipment investment is low, the equipment operation rate is high, the energy consumption is low, and the application range of raw materials is wide, and various different iron-containing resources can be treated.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a rotary hearth furnace for efficiently utilizing waste heat of flue gas, and a system and method for using the rotary hearth furnace to smelt iron-containing resources at high temperature. Background technique [0002] The rotary hearth furnace is a metallurgical industrial furnace with a ring-shaped hearth and a rotatable bottom. The inside of the furnace body is radiant heat transfer. Generally, the burner burns gas or natural gas to increase or maintain the temperature of the hearth. It is used to process iron-containing materials. And cooperate to extract nickel, zinc, chromium and other valuable metal elements. Rotary hearth furnace coal-based direct reduction method has been developed rapidly in recent years due to its fast reaction speed and strong adaptability of raw materials. Iron metallurgical slag, red mud and other iron-containing resources. But at the same t...

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Problems solved by technology

[0004] On the other hand, the pretreatment process of the existing rotary hearth furnace is long, and the equipment investment is relatively high

In the existing technological process for treating iron-containing resources in a rotary hearth furnace, the prepared water-containing pellets need to be dried and then put into the rotary hearth furnace for reduction. The reason is: undried water-containing pellets (generally more than 13% ) if it is directly put into the furnace, it will burst under high temperature conditions and generate a lot of dust in the furnace. Under the gas disturbance in the furnace, it will cause the burners on the inner and outer walls of the rotary hearth furnace to be blocked, so that the production cannot go smoothly.

It can be seen that the "drying" link is a necessary pretreatment step for the existing rotary hearth furnace combustion system, but this has led to the defects of long pretreatment process before the rotary hearth furnace, large equipment investment, and high energy consumption, which needs further improvement

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