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Recycling method for treating iron-bearing dust by utilizing carbonation process

A carbonation and carbonation consolidation technology, which is applied in the improvement of process efficiency and the manufacture of converters, etc., can solve the problems such as the inability of emission reduction to play a role, achieve emission reduction of greenhouse gases such as CO2, improve penetration capacity, and shorten converters. The effect of the steelmaking cycle

Inactive Publication Date: 2012-10-17
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes that the existing technology can only effectively realize the recycling of iron-containing dust, but CO 2 Defects that hardly play a role in emission reduction, etc.

Method used

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  • Recycling method for treating iron-bearing dust by utilizing carbonation process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Prepare the mixture: fully mix the iron-containing dust and active lime according to the weight ratio of 65%:35%, and ensure that the CaO content is 20% by weight to obtain a mixture of iron-containing dust and active lime.

[0026] 2. Mix again: add water to the mixture, by weight, the amount of water added is 10% of the weight of the mixture, such as adding 10 kg of water to 100 kg of mixture. Mix the mixture thoroughly again, and stack it for 2 hours to ensure that the lime can be fully digested.

[0027] 3. Preparation of qualified green balls: Put the digested mixture into a ball press machine and press it into balls to obtain qualified green balls with a diameter of 12.5mm.

[0028] 4. Carbonation consolidation reaction: Put the qualified green balls into the carbonation reaction tank for carbonation consolidation reaction, the reaction temperature is 550 ° C, and the volume concentration of 50% CO is introduced. 2 Gas, the gas flow rate is 1.5cm / s, the reacti...

Embodiment 2

[0031] 1. Prepare the mixture: fully mix the iron-containing dust and active lime according to the ratio of 70%:30%, and ensure that the content of CaO is 25% by weight to obtain a mixture of iron-containing dust and active lime.

[0032] 2. Mix again: add water to the mix, by weight, the amount of water added is 8% of the mix weight, such as adding 8 kg of water to 100 kg of mix. Mix the mixture thoroughly again, and stack it for 2 hours to ensure that the lime can be fully digested.

[0033] 3. Prepare qualified green balls: put the digested mixture into a disc pelletizer and roll into balls to obtain qualified green balls with a diameter of 10mm.

[0034] 4. Carbonation consolidation reaction: Put the qualified green balls into the carbonation reaction tank for carbonation consolidation reaction, the reaction temperature is 500°C, and the volume concentration of the feed is 55% CO 2 Gas, the gas flow rate is 1.5cm / s, the reaction time is 20min, and the finished carbonated...

Embodiment 3

[0037] 1. Prepare the mixture: fully mix the iron-containing dust and active lime according to the weight ratio of 60%:40%, and ensure that the CaO content is 30% by weight to obtain a mixture of iron-containing dust and active lime.

[0038] 2. Mix again: add water to the mixture, by weight, the addition of water is 10% of the weight of the mixture, such as adding 9 kilograms of water to 100 kilograms of mixture. Mix the mixture thoroughly again, and stack it for 2 hours to ensure that the lime can be fully digested.

[0039] 3. Preparation of qualified green balls: Put the digested mixture into a ball press machine and press it into balls to obtain qualified green balls with a diameter of 12.5mm.

[0040] 4. Carbonation consolidation reaction: Put the qualified raw balls into the carbonation reaction tank for carbonation consolidation reaction, the reaction temperature is 600°C, and the volume concentration of 55% CO is introduced. 2 Gas, the gas flow rate is 1.5cm / s, the r...

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Abstract

The invention relates to a method for recycling iron-bearing dust in iron and steel enterprises and realizing CO2 emission reduction, in particular to a recycling method for treating iron-bearing dust by utilizing a carbonation process. The method comprises the following steps: mixing raw materials uniformly in proportion: fully mixing the iron-bearing dust with active lime uniformly according to a certain proportion; slaking the lime: adding water to the mixture to be mixed uniformly again, and stacking the mixture for 2 hours to ensure that the lime can be fully slaked; pelletizing: preparing the fully slaked mixture into fresh pellets in a disc pelletizer or a pellet press; carrying out carbonation solidifying: putting the fresh pellets into a carbonation reaction tank, and introducing CO2 gas under certain temperature to carry out carbonation reaction; and carrying out converter slagging: adding carbonated finished pellets at the initial stage of converter smelting, thereby shortening the converter steelmaking cycle and reducing the production cost and resource consumption. The method is simple, has lower cost, can effectively realize recycling of the iron-bearing dust in iron and steel enterprises and emission reduction of greenhouse gases (such as CO2 and the like), and has higher economic and social values.

Description

technical field [0001] The invention relates to the recycling and utilization of iron-containing dust in iron and steel enterprises and the realization of CO 2 A method for emission reduction, especially a carbonation process for recycling iron-containing dust, which is used in converters to accelerate slagging, shorten converter smelting cycles, and improve dephosphorization rates. Background technique [0002] As the global climate deterioration caused by the greenhouse effect has begun to have a serious negative impact on human survival and development, CO 2 The reduction of greenhouse gas emissions has also become the focus of attention of countries all over the world. As a resource-intensive industry, iron and steel enterprises not only consume huge energy in the process of iron and steel metallurgical production, but also such as CO 2 Emissions and various metallurgical dusts have also caused great pollution to the atmosphere and the surrounding environment of the ent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
CPCY02P10/20
Inventor 胡长庆张玉柱张志霞韩涛石焱解建军刘文会
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY