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Method for producing iron beads at low temperature through dust of iron and steel plant

A technology for iron and steel plants and dust, applied in the field of dust treatment technology in iron and steel plants, can solve the problems of high melting temperature of pearl iron, low processing efficiency, high temperature, etc., and achieve the effects of improving production efficiency, reducing pollution and low cost

Active Publication Date: 2016-09-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of the rotary hearth furnace is that the processing efficiency is low, and the melting temperature for the production of pearl iron is relatively high (required to be above 1400 ° C), especially for the treatment of dust agglomerates with many gangue components and low iron grade. long time

Method used

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  • Method for producing iron beads at low temperature through dust of iron and steel plant
  • Method for producing iron beads at low temperature through dust of iron and steel plant
  • Method for producing iron beads at low temperature through dust of iron and steel plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The bag ash and electric furnace ash are mixed in a mass ratio of 3:7. The composition is shown in Table 1. Coke powder is added to the dust according to C / O=1.0, and the amount of binder cement is 10% of the mass of the mixed dust. The dosage of flux ferrite is 2% of the mass of the mixed dust, and the mixture is mixed in a high-speed mixer. During the mixing process, water is added to the mixture in the form of spraying. The total amount of water added is controlled within the dust, About 10% of the total mass of coke, cement and flux after mixing. Subsequently, the fully mixed mixture was kept under pressure for 1 minute under a pressure of 80 MPa in a ball press to make the mixture into blocks. The agglomerates were cured for 72 hours at a humidity of 95% and 25° C. and then dried for 4 hours to obtain self-reducing dust agglomerates. The self-reducing agglomerate can be roasted in the rotary hearth furnace for a certain period of time to achieve good melting of sl...

Embodiment 2

[0025] As in Example 1, the dust is changed to machine tail ash and electric furnace ash, and the mass ratio is still mixed at a ratio of 3:7. The composition is shown in Table 2. The flux is spodumene, and the addition amount is 2% of the mass of the mixed dust. %. The produced self-reducing agglomerate can be roasted in a rotary hearth furnace for a short period of time to achieve good melting of slag iron and the reduction degree of iron oxide is higher than 90%. The produced iron pearl can be directly used in steelmaking or smelting iron craft.

[0026] Table 1 Example 1 Dust Main Components

[0027]

[0028] Table 2 Example 2 dust main components

[0029]

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Abstract

The invention relates to a method for producing iron beads at the low temperature through dust of an iron and steel plant. The method has high adaptability to raw materials, can utilize dust generated during different processes of the iron and steel plant, and carries out matching according to basic physical properties of the raw materials. One or more kinds of dust is evenly mixed with a reduction agent, an adhesive agent and a fluxing agent, then the mixture is pressed into cold solidified pellets, the pellets are subjected to reduction, smelting and slag-iron separation in a rotary hearth furnace, and accordingly iron beads with a low metallization ratio and low-iron slag are obtained. The method mainly includes the two steps that the self-reduced dust pellets are prepared through raw materials such as dust and the fluxing agent, and the dust pellets are smelted by the rotary hearth furnace at the low temperature to produce iron beads. The problem that melt separation is difficult as self-reduced dust pellets are high in melt separation temperature, harmful ingredient content and slag amount is solved.

Description

Technical field [0001] The invention relates to a process for treating dust in iron and steel plants, in particular to a rotary hearth furnace process for processing dust in iron and steel plants at a low temperature by using a rotary hearth furnace to recover valuable element zinc while producing pearl iron. Background technique [0002] As the basic industry of the national economy, the iron and steel industry's main product, steel, is involved in all aspects of our daily lives. In recent years, with the serious overcapacity of the steel market and the increasing attention of the international community to environmental protection, the iron and steel enterprises are in a difficult situation. Therefore, it is particularly important to seek a way out of energy conservation and environmental protection to reduce operating costs. Dust is the most polluting solid waste in iron and steel enterprises and can also be recycled as secondary resources. The efficient recycling of dust...

Claims

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Application Information

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IPC IPC(8): C21B13/08C21B13/14
CPCC21B13/08C21B13/14C21B2200/00
Inventor 张建良刘征建陈子罗袁骧李世钦
Owner UNIV OF SCI & TECH BEIJING
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