Method for strengthening reduction roasting based on heating cracking of iron-containing material

A material and roasting technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., to reduce apparent activation energy, increase reactive sites, and increase reaction rate.

Active Publication Date: 2020-09-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned problems existing in the existing complex and refractory iron ore processing technology,

Method used

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  • Method for strengthening reduction roasting based on heating cracking of iron-containing material
  • Method for strengthening reduction roasting based on heating cracking of iron-containing material
  • Method for strengthening reduction roasting based on heating cracking of iron-containing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The iron-bearing material is a complex iron ore ore with an iron grade of TFe 33.56% and SiO in mass percentage 2 44.95%;

[0058] The process is like figure 2 Shown

[0059] Crush the iron-containing material to a particle size of 2-15mm, and then grind the ore to a particle size of -0.074mm, which accounts for 35% of the total mass, to make mineral powder;

[0060] Adopt a pre-oxidation roaster with a burner and an air inlet at the bottom. The lower part of the pre-oxidation roaster is provided with a feed inlet, the upper part is connected to the cyclone separator through a material channel, and the exhaust port of the cyclone separator is connected to the induced draft fan through a pipe; Pass natural gas into the burner to produce combustion flue gas and pass it into the pre-oxidation roaster. At the same time, under the condition of starting the induced draft fan, pass air into the pre-oxidation roaster and remove the ore powder from the lower part of the pre-oxidation...

Embodiment 2

[0067] The iron-bearing material is a complex iron ore ore, with an iron grade of TFe 38.7% and containing SiO by mass percentage 2 41.4%;

[0068] The method is the same as in Example 1, the difference is:

[0069] (1) The part that is ground to a particle size of -0.074mm accounts for 40% of the total mass;

[0070] (2) The pre-oxidation roasting temperature is 820℃; the residence time of the solid materials in the pre-oxidation roasting furnace is 4 min;

[0071] (3) The reduction roasting temperature is 530℃; the amount of reducing gas is the CO / H required for the complete reaction of the reduction roasting 2 1:2 times the theoretical amount; the volume flow ratio of nitrogen and reducing gas in the regenerative reduction roaster is 3:1; the residence time of the solid materials in the regenerative reduction roaster is 35min;

[0072] (4) Cool down to 210°C to obtain cooled and reduced materials; the residence time of the reduced materials in the primary cooling cyclone is 2.5 min;...

Embodiment 3

[0075] The iron-bearing material is a complex iron ore ore, with an iron grade of TFe 29.67%, containing SiO by mass percentage 2 49.84%;

[0076] The method is the same as in Example 1, the difference is:

[0077] (1) The part that is ground to a particle size of -0.074mm accounts for 50% of the total mass;

[0078] (2) The pre-oxidation roasting temperature is 830℃; the residence time of the solid materials in the pre-oxidation roasting furnace is 6 min;

[0079] (3) The reduction roasting temperature is 550℃; the amount of reducing gas is the CO / H required for the complete reaction of the reduction roasting 2 1.3 times the theoretical amount; the volume flow ratio of nitrogen and reducing gas in the regenerative reduction roaster is 2.5:1; the residence time of solid materials in the regenerative reduction roaster is 20min;

[0080] (4) Cool down to 250°C to obtain cooled and reduced materials; the residence time of the reduced materials in the primary cooling cyclone is 5 min; the ...

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Abstract

The invention discloses a method for strengthening reduction roasting based on heating cracking of an iron-containing material. The method comprises the following steps of: (1) crushing and grinding the iron-containing material into mineral powder; (2) conveying the mineral powder to a pre-oxidation roasting furnace, heating the mineral powder in a suspension state for pre-oxidation roasting, andthen enabling the mineral powder to enter a cyclone separator; (3) performing discharging into a heat storage reduction roasting furnace through cyclone separation, and carrying out reduction roastingwith reducing gas in a suspension state; (4) conveying the reduced material to a primary cooling cyclone separator, carrying out cyclone separation under a nitrogen atmosphere condition, and performing cooling to 200-300DEG C; (5) feeding the cooled and reduced material into a secondary cooling cyclone separator through a flow sealing valve, carrying out cyclone separation in an air atmosphere, and carrying out reoxidation reaction; and (6) grinding the re-oxidized material to prepare secondary mineral powder; and performing low intensity magnetic separation. According to the method, the reaction active sites of iron minerals are increased, the reaction rate is increased, and the apparent activation energy of the reduction reaction is reduced, so that the reduction effect is enhanced.

Description

Technical field [0001] The invention belongs to the technical field of mineral processing, and specifically relates to a method for strengthening reduction roasting based on the heating and cracking of iron-containing materials. Background technique [0002] The resource utilization rate of low-grade complex refractory iron ore is low. Therefore, the realization of large-scale and efficient utilization of low-grade complex refractory iron ore resources will alleviate the shortage of iron ore resources. [0003] Patent CN104593588 discloses a method for roasting lean iron ore in a rotary kiln. It is proposed to use iron ore with an iron content of about 40% as a raw material and use the rotary kiln to roast and recover the contained iron; this method can realize iron resources to a certain extent The use of coal reduces the amount of coal, but the conventional calcination equipment of the rotary kiln is used, the oxidizing atmosphere and the reducing atmosphere in the system coexist...

Claims

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Application Information

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IPC IPC(8): B03C1/005B03C1/02C22B1/02
CPCB03C1/015B03C1/02C22B1/02
Inventor 韩跃新高鹏张琦袁帅李艳军孙永升
Owner NORTHEASTERN UNIV
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