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Method for iron ore powder agglomeration

An iron ore powder and agglomeration technology, which is applied in the field of blast furnace raw material preparation, can solve the problems of sinter chemical composition fluctuation, low production efficiency, and low energy utilization, so as to improve bulk density and blast furnace production efficiency, improve grade, and improve metallurgy performance effect

Active Publication Date: 2016-02-17
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still uses a simple traditional sintering trolley process to process metallurgical iron-containing waste to produce sintered ore, which has low production efficiency, low energy utilization, and produces a large amount of sulfide and nitride that pollute the air. Different actual conditions cause large fluctuations in its composition, which easily causes fluctuations in the chemical composition of sinter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the requirements of binary alkalinity R=1.10 and TFe content of 63%, the ingredients are calculated by weight percentage: 89.5% iron ore powder, 5% limestone powder, 5% magnesium cement, spherical plastic foam with an average diameter of 0.1-2mm 0.5% pore-forming agent, divide the iron ore powder into two parts according to the particle size, one part has a particle size of 0-1mm, and the other has a particle size of 1-5mm; put iron ore powder with a particle size of xx-yy, 5 % limestone powder, 5% magnesium cement and 0.5% pore-forming agent were mixed for 3 minutes, and 2% water vapor of the total mass was added during the mixing process to obtain a primary mixture; the primary mixture was mixed with a particle size of 1 The remaining iron ore powder of -5mm is put into the mixer and mixed for 2 minutes, and 4% water vapor of the total mass is added during the mixing process to obtain a uniform mixture; the uniform mixture is put into a cuboid mold for pre...

Embodiment 2

[0021] According to the requirements of binary alkalinity R=1.50 and TFe content of 55%, the ingredients are calculated by weight percentage: 84.5% iron ore powder, 10% limestone powder, 5% magnesium cement, spherical plastic foam with an average diameter of 0.1-2mm 0.5% pore forming agent, the iron ore powder in it is divided into two parts according to the particle size, one part has a particle size of 0-1mm, and the other has a particle size of 1-5mm; put iron ore powder with a particle size of 0-1mm, 10 % limestone powder, 5% magnesium cement and 0.5% pore-forming agent were mixed for 5 minutes, and 3% water vapor of the total mass was added during the mixing process to obtain a primary mixture; the primary mixture and a particle size of 1 The remaining iron ore powder of -5mm is put into the mixer and mixed for 3 minutes, and 4% water vapor of the total mass is added during the mixing process to obtain a uniform mixture; the uniform mixture is put into a cuboid mold and pr...

Embodiment 3

[0023] According to the requirements of binary alkalinity R=1.20 and TFe content of 59%, the ingredients are calculated by weight percentage: 89.5% iron ore powder, 6% limestone powder, 4% magnesium cement, spherical plastic foam with an average diameter of 0.1-2mm 0.5% pore forming agent, the iron ore powder in it is divided into two parts according to the particle size, one part has a particle size of 0-1mm, and the other has a particle size of 1-5mm; put iron ore powder with a particle size of 0-1mm, 6 % limestone powder, 4% magnesium cement and 0.5% pore-forming agent were mixed for 4 minutes, and 3% water vapor of the total mass was added during the mixing process to obtain a primary mixture; the primary mixture and a particle size of 1 The remaining iron ore powder of -5 mm is put into the mixer and mixed for 2 minutes, and 4% water vapor of the total mass is added during the mixing process to obtain a uniform mixture; the uniform mixture is put into a cuboid mold and pre...

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Abstract

The invention discloses a method for iron ore powder agglomeration. The method aims at improving the iron grade of iron ore, reducing energy consumption and reducing environmental pollution. The method includes the steps that iron ore powder, limestone powder, magnesium cement and pore-forming agents are proportioned for iron ore powder briquettes; primary mixing is carried out, and the small-granularity iron ore powder, the limestone powder, the magnesium cement and the pore-forming agents are put in a mixer; secondary mixing is carried out, the primary mixture and the remaining large-granularity iron ore powder are put into the mixer to be mixed evenly to obtain a uniform mixture; the uniform mixture is placed in a cuboid-shaped mold to be pressed into an iron briquette raw material; the iron briquette raw material is roasted; and crushing and screening are carried out. According to the method, the magnesium cement serves as a binder and a MgO additive, the pore-forming agents are added to the mixture, the cold press molding technology is adopted for pressing multi-pore iron briquettes, and therefore the iron ore powder agglomeration efficiency is improved, the metallurgical performance of the iron briquettes is improved, the production technology process is simplified, the quantity of the binder used in sintering and palletizing is reduced, iron ore resources are expanded, and the bulk density of the iron briquettes and the production efficiency of a blast furnace are improved.

Description

technical field [0001] The invention relates to a method for preparing blast furnace raw materials, in particular to a method for making iron ore powder into agglomerates. Background technique [0002] Fine ore agglomeration is to make ore blocks that meet the smelting requirements by artificial means after batching metal ore powder that cannot be directly put into the furnace. Powder ore agglomeration is an important part of raw material preparation before smelting. It not only expands the source of smelting raw materials, but also improves the quality of raw materials. [0003] The main methods of iron ore powder agglomeration are sintering and pelletizing. Sintering is to mix fine-grained iron-containing raw materials with fuel and flux in a certain proportion, add water to moisten and mix them evenly, and then spread them on the sintering machine. After igniting, ventilating, and burning the fuel in the sintering material to generate high temperature, a series of The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/02C22B1/243
Inventor 张松李金莲
Owner UNIV OF SCI & TECH LIAONING
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