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Apparatus and method for producing pearl iron

A bead iron and rotary hearth furnace technology, applied in the furnace type, furnace, gas emission reduction and other directions, can solve the problems of low metallization rate of pellets, difficult to precipitate iron beads, etc., to improve the metallization rate level and increase the temperature rise Effects of Rate and Temperature Uniformity

Active Publication Date: 2017-03-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, based on the current situation of coal-based pellets subjected to combustion atmosphere under industrial production conditions, the metallization rate of pellets reduced by rotary hearth furnace is not high, and it is difficult to precipitate iron beads. It is necessary to improve related equipment and processes to solve the above problems , directly produce pearl iron, which better meets the application of follow-up products

Method used

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  • Apparatus and method for producing pearl iron

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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, a device for producing pearl iron, it includes a gas furnace kiln 1, a gas mixing furnace 2, a high temperature gas delivery pipeline 4, an air inlet flue 5 and a rotary hearth furnace 6, and the gas furnace kiln 1 passes through the high temperature The gas delivery pipeline 4 is connected to the gas mixing furnace 2 , and the gas mixing furnace 2 is connected to the rotary hearth furnace 6 through the air inlet flue 5 . The gas mixing furnace 2 is connected with a reducing gas pipeline 3 . The furnace wall of the rotary hearth furnace 6 is provided with a supplementary air tuyere. The inner empty height of the hearth of the rotary hearth furnace 6 is 20cm-150cm. The rotary hearth furnace 6 is also provided with a tail gas discharge channel 7 , a rotary hearth furnace cooling discharge area 8 and a rotary hearth furnace charging area 9 .

Embodiment 2

[0031] A kind of method concrete content of the present invention's rotary hearth furnace production pearl iron is as follows:

[0032] a. There is no burner device on the furnace wall of the rotary hearth furnace, and 0-10 air supply outlets are set. When the furnace is built, the clear height of the furnace is reduced to 20cm-150cm. The high temperature area of ​​the rotary hearth furnace is cooled by the furnace. The air inlet flue is respectively connected to the high temperature zone of the rotary hearth furnace and the gas mixing chamber. The gas mixing chamber is connected to the gas furnace through the high temperature gas pipeline. Gas heating, non-reducing high-temperature flue gas generated by combustion outside the furnace is used as the coal-based reduction heating source of the rotary hearth furnace.

[0033] b. Coal-based pellets are dried and preheated into the furnace. The temperature of the high-temperature flue gas generated by the gas-fired furnace is contr...

Embodiment 3

[0046] According to the implementation steps, under the condition that there is no supplementary air outlet and reducing gas pipeline in the gas mixing chamber, N2 is not injected in the cooling discharge area, and coke oven gas is used to burn in the gas furnace to produce O2 volume content of 2.4%, 1474 ℃ high temperature flue gas , on the rotary hearth furnace equipment for the 1t / h design capacity experiment, the thickness of the coal-based pellets is 6 layers of balls, and the exhaust gas exhaust rate is 1.2m / s. The produced metallized material is packed in a sealed tank, sorted to obtain iron pearl, and the residue is crushed and magnetically ground to obtain fine-grained iron powder. The total iron recovery rate of iron pearl and iron powder reaches 96%.

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Abstract

The invention discloses a device and method for producing iron beads and solves the technical problems of the defects of low reduced pellet metallization ratio of a rotary hearth furnace and difficulty in separation of the iron beads through process equipment due to the influence of the combustion atmosphere on coal-based pellets under the industrial production conditions. A method for providing high-temperature flue gas by a gas furnace kiln and then conveying the high-temperature flue gas into the rotary hearth furnace is adopted, non-reducing high-temperature flue gas generated by combustion outside the furnace serves as a coal-based reducing heating source of the rotary hearth furnace, an original in-furnace combustion flame heat radiation heating mode is changed into an outer supply high-temperature flue gas heat exchange mode, the heating rate and the temperature uniformity of the coal-base pellet are improved, the zonal combustion behavior and the process of a hearth are eliminated, the atmosphere in the furnace is stably kept as the neutral or weak reducing atmosphere, the metallization ratio level of the coal-base pellet is greatly improved, and protection measures are taken for reduced materials during discharging from the furnace, so that the iron beads are obtained through industrial reducing production of the rotary hearth furnace.

Description

technical field [0001] The invention relates to the technical field of iron pearl production, in particular to a device and method for producing iron pearl. Background technique [0002] With the increasing shortage of resources, especially the scarcity of high-quality iron-containing raw materials and coking coal, the survival and development of traditional blast furnace process iron and steel enterprises have been greatly challenged. The non-blast furnace ironmaking technology, which has less resource constraints, greater flexibility, and shorter process, has received more and more attention and attention. In recent years, due to the technological and equipment characteristics of the rotary hearth furnace, it has gradually attracted the attention of the ironmaking industry, and its application in the production of direct reduction of coal-based pellets has achieved rapid development. [0003] At present, there are three main methods for the follow-up utilization of metall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14C21B13/10
CPCY02P10/143
Inventor 刘功国秦洁
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP