Method for inhibiting malignant reduction swelling of iron pellets

A technology for pellets and pellets, applied in the field of inhibiting the vicious reduction expansion of iron pellets, can solve the problems of uneconomical, unsuitable for popularization and application, unable to control the reduction expansion rate within the normal expansion range, etc.

Inactive Publication Date: 2021-07-06
包钢集团矿山研究院(有限责任公司) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reduction expansion rate of malignantly expanded pellets can be controlled within the normal expansion range by increasing the proportion of bentonite and other additives, the proportion often needs to be more than 5% to 6%, which is uneconomical and not suitable for populariz

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for suppressing the reduction and expansion of pellets in the present embodiment is as follows (taking the production of pellets in Baiyun Obo Zhudong Concentrate as an example):

[0022] (1) Produce pellets with Zhudong concentrate of Baiyun Obo, the -500 mesh size of Zhudong concentrate accounts for 47.46%, adopt optimized parameters: preheating temperature 825°C, roasting temperature 1220°C, pellets The reduction expansion rate is still as high as 75.7%;

[0023] (2) After the concentrate was ground in a ball mill for 12 minutes, the particle size of -500 mesh increased to 66.97%. Also using the optimized parameters (preheating temperature 825°C, roasting temperature 1220°C) to produce pellets, the reduction expansion rate of pellets is reduced to 17.2%, the effect is very good, only two measures are used to pelletize The reductive bloat rate of the swell has been reduced from 75.7% of catastrophic bloat to 17.2% of normal bloat.

Embodiment 2

[0025] The method for suppressing the reduction and expansion of pellets in the present embodiment is as follows (taking the production of pellets in Barun Concentrate (i.e. Baiyun Obo West Mine) as an example):

[0026] (1) Barun concentrate is used to produce pellets, the concentrate-500 mesh size accounts for 50.78%, and the optimized parameters are adopted: after the preheating temperature is 825°C and the roasting temperature is 1220°C, the reduction expansion rate of the pellets Still as high as 53.0%;

[0027] (2) After the concentrate was ground in a ball mill for 30 minutes, the particle size of -500 mesh increased to 88.92%. The same optimized parameters (preheating temperature 825°C, roasting temperature 1220°C) were used to produce pellets, but the reduction expansion rate of the pellets was only reduced to 26.5%, still not up to the standard;

[0028] (3) On the basis of the above-mentioned measures, 1.0% of quartz powder was added as a dispersion accelerator to ...

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PUM

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Abstract

The invention discloses a method for inhibiting malignant reduction swelling of iron pellets. The method comprises the following steps of, (1), determining proper preheating and roasting temperatures through a pellet test, and carrying out fine tuning optimization by controlling the preheating temperature to be 800-850 DEG C and the roasting temperature to be 1200-1220 DEG C; (2) finely grinding iron ore concentrate until the particle size of -500 meshes accounts for more than 70%; (3) adding minerals of which the main component is silicon dioxide or the iron ore concentrate of which a small amount of gangue component is mainly silicon dioxide into pelletizing raw materials as a promoting agent to promote the diffusion of volatile components generated during preheating roasting, so as to effectively inhibit the reduction swelling of the pellets; and (4) taking at least one of the steps (1), (2) and (3) to control the reduction swelling rate of the pellets within 20%. According to the method, the reduction swelling rate of the pellets subjected to malignant reduction swelling can be reduced to be within the normal reduction swelling range.

Description

technical field [0001] The invention relates to the field of pellets for smelting raw materials and ore pretreatment in the metallurgical industry, in particular to a method for inhibiting the malignant reduction and expansion of iron pellets. Background technique [0002] Pellets are one of the main raw materials for blast furnace ironmaking, and the reduction expansion rate of pellets is one of the main indicators to measure its quality. If the reduction expansion of the pellets exceeds the normal expansion range, it will lead to the increase of furnace dust in the blast furnace, the poor air permeability of the furnace charge, and cause hazards such as hanging material collapse and furnace wall nodulation, which will seriously affect the normal production of the blast furnace. , The problem of malignant reduction and expansion of pellets is a problem that must be solved in pellet production. [0003] The reduction expansion rate of ordinary iron ore pellets is generally ...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 沈茂森吕志义康文革郭爱芳孟文祥李玉柱柳建勇白晓光
Owner 包钢集团矿山研究院(有限责任公司)
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