Method for preparing hot pressed balls of iron ore concentrate and powdered coal

A technology of iron ore concentrate powder and iron ore concentrate, which is applied in the field of iron and steel smelting, can solve the problems of restricting the large-scale use of cold-consolidated pellets, increasing the amount of slag, and reducing the compressive strength of pellets, and achieves excellent melting dripping performance, The effect of broad application prospects

Inactive Publication Date: 2007-07-25
NORTHEASTERN UNIV
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  • Abstract
  • Description
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Problems solved by technology

After these pellets are added to the blast furnace or shaft furnace, on the one hand, the amount of slag will increase, which will have an adverse effect on smelting; Reduced compressive strength, which limits the large use of cold consolidated pellets
This is also the main reason why many domestic cold-consolidated carbon-containing pellet direct reduction and smelting reduction processes have not been successful and developed.

Method used

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  • Method for preparing hot pressed balls of iron ore concentrate and powdered coal

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Effect test

Embodiment 1

[0033] Iron concentrate coal powder hot-pressed briquettes are formed by hot-pressing iron concentrate powder, coal powder and flux. The particle size of pulverized coal is 120 mesh to 200 mesh, which is 100%, of which -200 mesh is 33%; the particle size of iron concentrate powder is the particle size after beneficiation, and -200 mesh is greater than 60%; the flux is quicklime (CaO) powder, particle size -200 Mesh>50%. According to weight percentage, iron concentrate powder 65.2%, coal powder 27.9% and quicklime powder 6.9% are proportioned, coal powder is preheated to 150°C, iron concentrate powder is preheated to 700°C, quicklime powder is preheated to 150°C. Then, the above-mentioned preheated iron concentrate powder, coal powder and flux were mixed and stirred for 18 minutes, and the mixture of the fully mixed iron concentrate powder, coal powder and flux was hot-pressed with a double-roller hot press, and heated The pressing temperature is 450°C and the pressure is 35M...

Embodiment 2

[0040] Iron concentrate coal powder hot-pressed briquettes are formed by hot-pressing iron concentrate powder, coal powder and flux. Coal powder particle size between 120 mesh and 200 mesh is 100%, of which -200 mesh is 35%; the particle size of iron concentrate powder is the particle size after beneficiation, and -200 mesh is greater than 60%; the flux is quicklime (CaO) powder, particle size -200 Mesh>50%. Preheat the coal powder to 200°C, preheat the iron concentrate powder to 750°C, and preheat the quicklime powder to 200 ℃. Then, mix and stir the above-mentioned preheated iron ore concentrate powder, coal powder and flux for 20 minutes, and heat press the mixture of fully mixed iron ore concentrate powder, coal powder and flux with a double-roller hot press, heat The pressing temperature is 500°C and the pressure is 25MPa. The crushed material of the hot-pressed agglomerate is returned to the raw material part of the iron ore powder, and enters the preheating step toge...

Embodiment 3

[0042] Iron concentrate coal powder hot-pressed briquettes are formed by hot-pressing iron concentrate powder, coal powder and flux. Coal powder particle size between 120 mesh and 200 mesh is 100%, of which -200 mesh is 30%; the particle size of iron concentrate powder is the particle size after beneficiation, and -200 mesh is greater than 60%; the flux is quicklime (CaO) powder, particle size -200 Mesh>50%. Preheat the coal powder to 100°C, the iron concentrate powder to 600°C, and the quicklime powder to 100% by weight. ℃. Then, mix and stir the above-mentioned preheated iron concentrate powder, coal powder, and flux for 15 minutes, and use a double-roller hot press to heat press the mixture of the fully mixed iron concentrate powder, coal powder, and flux. The pressing temperature is 400°C and the pressure is 45MPa. The crushed material of the hot-pressed agglomerate is returned to the raw material part of the iron ore powder, and enters the preheating step together with...

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Abstract

This invention discloses a method for preparing hot briquettes from iron concentrate and coal powder. The method comprises: pre-heating coal powder, iron concentrate and quicklime powder, mixing, hot-pressing by a double-roller press, and performing post-treatment at 550-600 deg.C for 20-30 min. The hot briquettes can be used as the raw material for iron smelting in blast furnace, and have such advantages as excellent high-temperature strength, good reduction capacity, good melt-dripping property, and low energy consumption. The method can improve the raw material suitability of iron industry.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to blast furnace and smelting reduction ironmaking technology, in particular to a preparation method of hot-pressed iron concentrate coal powder agglomerates. Background technique [0002] my country's steel output has ranked first in the world for 9 consecutive years. In 2005, its steel output reached 348 million tons, making it a veritable steel producing country and even a strong steel country. The rapid development of the iron and steel industry has become an important supporting condition for the sustained and stable development of my country's national economy, and has promoted the development and technological progress of related industries. However, the resource and energy consumption of the existing domestic iron and steel production process is large, and the production efficiency is low; the concentration of the iron and steel industry is low, and the indepen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
Inventor 储满生佟成印赵庆杰曹晋真
Owner NORTHEASTERN UNIV
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