CN104726692A - Method for improving reduction temperature of iron ore in shaft furnace magnetizing roasting - Google Patents
Method for improving reduction temperature of iron ore in shaft furnace magnetizing roasting Download PDFInfo
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- CN104726692A CN104726692A CN201510156720.1A CN201510156720A CN104726692A CN 104726692 A CN104726692 A CN 104726692A CN 201510156720 A CN201510156720 A CN 201510156720A CN 104726692 A CN104726692 A CN 104726692A
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Abstract
The invention belongs to the technical field of metallurgy, and relates to a method for improving a reduction temperature of iron ore in shaft furnace magnetizing roasting. The method comprises the following steps: in shaft furnace magnetizing roasting of the iron ore, applying one part of a blast furnace gas out of a shaft furnace reduction medium of the iron ore; preheating a room-temperature reduction blast furnace gas employing a high-temperature flue gas which is generated by combination of the other part of blast furnace gas; mixing the preheated blast furnace gas with a coke oven gas and conveying to a shaft furnace reduction zone for the iron ore; and improving the shaft furnace reduction temperature of the iron ore to 70-75 DEG C on the basis of 550-700 DEG C, so that the thermodynamic condition of the shaft furnace magnetizing roasting of the iron ore is improved; and the shaft furnace magnetizing roasting speed and quality are improved; and meanwhile, the grade of fine iron ore concentrate, the metal recovery rate and the yield of the shaft furnace are greatly improved.
Description
Technical field
The invention belongs to metallurgical technology field, relate to kind of the method improving iron ore shaft furnace magnetizing roasting reduction temperature.
Background technology
In iron ore dressing process, iron ore of low ore grade is selected to be the magnetic improving ore for difficulty, the method of general employing magnetizing roasting, the rhombohedral iron ore in ore, limonite and spathic iron ore is made all to become magnetite, magnetite adopts ore grinding and magnetic separation process again, just can improve the grade of Iron concentrate and the metal recovery rate of ore dressing process; Iron ore of low ore grade is selected to adopt magnetic roasting process for difficulty, reduction of iron ore reducing medium used has solid reductant and gaseous reducing agent, when iron ore adopts solid reductant, reduction reaction is carried out after generally iron ore and reductive agent mixture need being heated to 700 ~ 900 DEG C, and reduction of iron ore speed dependent is in the gasification rate of reductive agent, its recovery time is longer; When iron ore adopts gaseous reducing agent, because gaseous reducing agent can only add from the zone of reduction of body of heater, the reduction temperature of iron ore can be reduced when reducing medium temperature is lower, but improve the restriction that reduction of iron ore temperature is subject to again ore caking and glues stove factor, the reduction temperature of iron ore is generally 600 ~ 700 DEG C, and lower reduction temperature causes reduction of iron ore speed to reduce.
Mainly apply shaft furnace for more than 15mm massive iron ore and carry out magnetizing roasting, for massive iron ore shaft furnace magnetic roasting process, comparatively often application is gaseous reducing agent, in gaseous reducing agent selection, generally according to H
2thermal conductivity is comparatively large, molecular radius is less, react comparatively fierce feature with reduction of ferrous oxide, and reductive agent is generally selected containing H
2measure higher coke-oven gas or high coke mixed gas, owing to containing the adhesive component such as a certain amount of tar and naphthalene in coke-oven gas, metal heat-exchange device can not be adopted to carry out preheating to coal gas, cause the magnetizing roasting of iron ore shaft furnace that normal temperature coal gas can only be adopted to reduce; When difficulty selects low-grade massive iron ore after the preheating zone of shaft furnace and heating zone Heating temperature bring up to 700 ~ 900 DEG C, high temperature iron ore contacts at reduction shaft furnace band with normal temperature reducing gas in downflow processes in shaft furnace, the reduction temperature of iron ore can be made to decline 80 ~ 100 DEG C, because reduction of iron ore temperature is lower, cause iron ore in the magnetizing roasting of reduction shaft furnace band for up to 4 ~ 5h, iron ore after roasting is after ore grinding and magnetic separation, gained Iron concentrate grade is 54 ~ 56%, and metal recovery rate is 82 ~ 84%.
Summary of the invention
The object of the invention is to provide a kind of method improving iron ore shaft furnace magnetizing roasting reduction temperature, to improve Iron concentrate grade, metal recovery rate and output for prior art Problems existing.
Improve a method for iron ore shaft furnace magnetizing roasting reduction temperature, comprise the following steps:
Blast furnace gas is divided into two portions, part blast furnace gas enters the Heat Room flowing of interchanger, in the combustion chambers burn of interchanger after another part blast furnace gas mixes with combustion air, blast furnace gas preheating in the high-temperature flue gas exchange hot cell produced, blast furnace gas after preheating and normal temperature coke-oven gas Mixed design reduction shaft furnace band, reduce to the iron ore in shaft furnace.
Described high-temperature flue gas and the blast furnace gas flow in Heat Room are than being 1:0.8 ~ 0.9.
Blast furnace gas in described combustion chamber and combustion air volume ratio 1:0.6 ~ 0.8.
Blast-furnace gas pressure in described combustion chamber is 6 ~ 10Kpa, and combustion air pressure is 8 ~ 12 Kpa.
Blast furnace gas after described preheating and normal temperature coke-oven gas volume ratio are 1:0.05 ~ 0.1.
Described interchanger is metallic recuperator.
The present invention has following beneficial effect:
The present invention is in the magnetizing roasting of iron ore shaft furnace, the blast furnace gas part used is used for outside iron ore reduction shaft furnace medium, the high-temperature flue gas produced after another part blast furnace gas combustion carries out the preheating of normal temperature reduction blast furnace gas, blast furnace gas after preheating and coke-oven gas blending transportation are to iron ore reduction shaft furnace band, iron ore reduction shaft furnace temperature is made to improve 70 ~ 75 DEG C on the basis of 550 ~ 700 DEG C, thus improve the thermodynamic condition of iron ore shaft furnace magnetizing roasting, the speed of iron ore magnetizing roasting and quality are improved, Iron concentrate grade simultaneously, metal recovery rate, shaft furnace output significantly improves.
Embodiment
Embodiment 1
Gas supply system is respectively to the Heat Room of interchanger and combustion chamber supply blast furnace gas, the blast-furnace gas pressure being delivered to combustion chamber be 7Kpa and by the combustion air pressure that gas blower is carried be 9Kpa by volume 1:0.6 mix the combustion chambers burn being incorporated in interchanger, the high-temperature flue gas of 900 ~ 1000 DEG C produced heats the Heat Room of hot device, high-temperature flue gas and the blast furnace gas flow in Heat Room are than being 1:0.8, the blast furnace gas temperature after heat exchange is made to be increased to 560 DEG C, in Heat Room through the blast furnace coal of preheating to be discharged by pipeline and with coke-oven gas by volume 1:0.06 mix, gained mixed gas temperature is reduced to 510 DEG C, input to reduction shaft furnace band again to reduce to the iron ore in shaft furnace.
The roasted ore obtained under this technique is after ore grinding and magnetic separation, the grade obtaining Iron concentrate is 56%, improve 2% compared with existing iron ore shaft furnace magnetizing roasting technology, metal recovery rate can reach 86%, improves 2% compared with existing tunnel kiln reduction roasting technology; In addition, this technology is adopted can to improve output about 22%, time shorten 23% compared with existing tunnel kiln reduction roasting technology.
Embodiment 2
Gas supply system is respectively to the Heat Room of interchanger and combustion chamber supply blast furnace gas, the blast-furnace gas pressure being delivered to combustion chamber be 8Kpa and by the combustion air pressure that gas blower is carried be 10Kpa by volume 1:0.7 mix the combustion chambers burn being incorporated in interchanger, the high-temperature flue gas of 900 ~ 1000 DEG C produced heats the Heat Room of hot device, high-temperature flue gas and the blast furnace gas flow in Heat Room are than being 1:0.8, the blast furnace gas temperature after heat exchange is made to be increased to 590 DEG C, in Heat Room through the blast furnace coal of preheating to be discharged by pipeline and with coke-oven gas by volume 1:0.07 mix, gained mixed gas temperature is reduced to 540 DEG C, input to reduction shaft furnace band again to reduce to the iron ore in shaft furnace.
The roasted ore obtained under this technique is after ore grinding and magnetic separation, the grade obtaining Iron concentrate is 58%, improve 3% compared with existing iron ore shaft furnace magnetizing roasting technology, metal recovery rate can reach 87%, improves 3% compared with existing tunnel kiln reduction roasting technology; In addition, this technology is adopted can to improve output about 27%, time shorten 26% compared with existing tunnel kiln reduction roasting technology.
Embodiment 3
Gas supply system is respectively to the Heat Room of interchanger and combustion chamber supply blast furnace gas, the blast-furnace gas pressure being delivered to combustion chamber be 10Kpa and by the combustion air pressure that gas blower is carried be 12Kpa by volume 1:0.8 mix the combustion chambers burn being incorporated in interchanger, the high-temperature flue gas of 900 ~ 1000 DEG C produced heats the Heat Room of hot device, high-temperature flue gas and the blast furnace gas flow in Heat Room are than being 1:0.9, the blast furnace gas temperature after heat exchange is made to be increased to 570 DEG C, in Heat Room through the blast furnace coal of preheating to be discharged by pipeline and with coke-oven gas by volume 1:0.09 mix, gained mixed gas temperature is reduced to 520 DEG C, input to reduction shaft furnace band again to reduce to the iron ore in shaft furnace.
The roasted ore obtained under this technique is after ore grinding and magnetic separation, the grade obtaining Iron concentrate is 59%, improve 4% compared with existing iron ore shaft furnace magnetizing roasting technology, metal recovery rate can reach 87%, improves 4% compared with existing tunnel kiln reduction roasting technology; In addition, this technology is adopted can to improve output about 28%, time shorten 28% compared with existing tunnel kiln reduction roasting technology.
Claims (6)
1. improve a method for iron ore shaft furnace magnetizing roasting reduction temperature, it is characterized in that, comprise the following steps:
Blast furnace gas is divided into two portions, part blast furnace gas enters the Heat Room flowing of interchanger, in the combustion chambers burn of interchanger after another part blast furnace gas mixes with combustion air, blast furnace gas preheating in the high-temperature flue gas exchange hot cell produced, blast furnace gas after preheating and normal temperature coke-oven gas Mixed design reduction shaft furnace band, reduce to the iron ore in shaft furnace.
2. a kind of method improving iron ore shaft furnace magnetizing roasting reduction temperature as claimed in claim 1, is characterized in that: described high-temperature flue gas and the blast furnace gas flow in Heat Room are than being 1:0.8 ~ 0.9.
3. a kind of method improving iron ore shaft furnace magnetizing roasting reduction temperature as claimed in claim 1 or 2, is characterized in that: the blast furnace gas in described combustion chamber and combustion air volume ratio 1:0.6 ~ 0.8.
4. a kind of method improving iron ore shaft furnace magnetizing roasting reduction temperature as claimed in claim 3, it is characterized in that: the blast-furnace gas pressure in described combustion chamber is 6 ~ 10Kpa, combustion air pressure is 8 ~ 12 Kpa.
5. a kind of method improving iron ore shaft furnace magnetizing roasting reduction temperature as described in claim 1,2 or 4, is characterized in that: the blast furnace gas after described preheating and normal temperature coke-oven gas volume ratio are 1:0.05 ~ 0.1.
6. a kind of method improving iron ore shaft furnace magnetizing roasting reduction temperature as described in claim 1,2 or 4, is characterized in that: described interchanger is metallic recuperator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510156720.1A CN104726692A (en) | 2015-04-03 | 2015-04-03 | Method for improving reduction temperature of iron ore in shaft furnace magnetizing roasting |
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| CN201510156720.1A CN104726692A (en) | 2015-04-03 | 2015-04-03 | Method for improving reduction temperature of iron ore in shaft furnace magnetizing roasting |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1188808A (en) * | 1997-01-24 | 1998-07-29 | 冶金工业部鞍山热能研究院 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
| CN101999004A (en) * | 2008-04-10 | 2011-03-30 | 新日本制铁株式会社 | Method for producing sintered ore |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
-
2015
- 2015-04-03 CN CN201510156720.1A patent/CN104726692A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1188808A (en) * | 1997-01-24 | 1998-07-29 | 冶金工业部鞍山热能研究院 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
| CN101999004A (en) * | 2008-04-10 | 2011-03-30 | 新日本制铁株式会社 | Method for producing sintered ore |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
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Application publication date: 20150624 |