Suspension roasting system for heating, cracking and strengthening reduction of iron-containing material

A technology of suspension roasting and suspension roasting furnace, which is applied in grain processing and other fields, and can solve the problems of high energy consumption and low efficiency

Active Publication Date: 2020-09-04
上海逢石科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems of high energy consumption and low efficiency existing in the existing recovery technology of iron-containing materials, the present invention provides a suspension roasting system for heating and cra

Method used

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  • Suspension roasting system for heating, cracking and strengthening reduction of iron-containing material
  • Suspension roasting system for heating, cracking and strengthening reduction of iron-containing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The structure of the suspension roasting system for heating and cracking to strengthen the reduction of iron-containing materials is as follows: figure 1 As shown, it includes a high-pressure roller mill 1, a feeding bin 2, a first cyclone separator 4, a first flow sealing valve 5, a pre-oxidation suspension roaster 6, a second cyclone separator 8, a regenerative reduction roaster 9, Nitrogen cooling cyclone separator 10, second flow sealing valve 12, air cooling cyclone separator 14, ball mill 15 and magnetic separator 16;

[0068] The outlet of the storage tank below the high-pressure roller mill 1 is opposite to the inlet of the feed bin 2, and the outlet of the feed bin 2 matches the feed inlet of the first cyclone separator 4; the outlet of the first cyclone separator 4 The discharge port is communicated with the feed port of the first flow seal valve 5, and the discharge port of the first flow seal valve 5 is communicated with the feed port of the pre-oxidation su...

Embodiment 2

[0088] System structure is the same as embodiment 1;

[0089] The miscellaneous iron ore iron grade used is TFe 37.9%, containing SiO by mass percentage 2 32.3%; Method method is the same as embodiment 1, and difference is:

[0090] (1) Particle size -0.074mm in the mineral powder accounts for 30-55% of the total mass;

[0091] (2) The pre-oxidation roasting temperature is 810°C; the residence time of the solid material in the pre-oxidation roaster 6 is 7min;

[0092] (3) The reduction roasting temperature is 520°C; the amount of reducing gas is based on the CO / H required for the complete reaction of the reduction roasting 2 1:1 times of the theoretical amount; the volume flow ratio of nitrogen and reducing gas in the regenerative reduction roaster 9 is 5:1; the residence time of the solid material in the regenerative reduction roaster 9 is 55min;

[0093] (4) The temperature drops to 210° C. to form a cooling reduction material; the residence time of the reduction materia...

Embodiment 3

[0096] System structure is the same as embodiment 1;

[0097] The iron grade of the complex iron ore used is TFe 32.1%, containing SiO by mass percentage 2 33.8%; Method method is the same as embodiment 1, and difference is:

[0098] (1) Particle size -0.074mm in the mineral powder accounts for 30-55% of the total mass;

[0099] (2) The pre-oxidation roasting temperature is 830° C.; the residence time of the solid material in the pre-oxidation roaster 6 is 5 min;

[0100] (3) The reduction roasting temperature is 550°C; the amount of reducing gas is based on 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 9 is 1:1; the residence time of the solid material in the regenerative reduction roaster 9 is 40 minutes;

[0101] (4) The temperature drops to 230° C. to form a cooling reduction material; the residence time of the reduction m...

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Abstract

The invention discloses a suspension roasting system for heating, cracking and strengthening reduction of the iron-containing material. A storage tank of a high-pressure roller mill is opposite to a feeding bin, and the feeding bin is matched with a first cyclone separator; the first cyclone separator and a first flow sealing valve communicate with a feeding hole of a pre-oxidation suspension roasting furnace in series; a discharge hole of the pre-oxidation suspension roasting furnace, a second cyclone separator and a heat storage reduction roasting furnace are communicated in series; a discharge hole of the heat storage reduction roasting furnace, a nitrogen cooling cyclone separator, a second flow sealing valve and an air cooling cyclone separator are communicated in series; and the aircooling cyclone separator, a ball mill and a magnetic separator are matched in sequence. The device and the system are stable in operation, large in treatment capacity, low in energy consumption and cost of unit treatment capacity, easy to control product properties and easy to realize large-scale equipment.

Description

technical field [0001] The invention relates to the technical field of iron mineral processing, in particular to a suspension roasting system for heating and cracking to strengthen the reduction of iron-containing materials. Background technique [0002] The resource utilization rate of low-grade complex refractory iron ore is low. Therefore, realizing large-scale and efficient utilization of low-grade complex refractory iron ore resources will alleviate the situation of insufficient supply of iron ore resources. [0003] Patent CN201911104564.9 relates to a beneficiation process for processing high-carbonate iron-depleted magnetic red mixed iron ore, which has achieved good indicators, but the process is too complicated, the dosage is large, the cost is high, and the environmental pollution is serious. [0004] Patent CN201820666513.X relates to a roasting and magnetizing equipment for iron ore, which adopts spiral staggered panels to heat and cool materials respectively, u...

Claims

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Application Information

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IPC IPC(8): C22B1/10B02C21/00
CPCB02C21/00C22B1/10
Inventor 韩跃新李艳军高鹏袁帅张琦孙永升
Owner 上海逢石科技有限公司
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