CN102268502A - Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln - Google Patents
Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln Download PDFInfo
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- CN102268502A CN102268502A CN2010102002130A CN201010200213A CN102268502A CN 102268502 A CN102268502 A CN 102268502A CN 2010102002130 A CN2010102002130 A CN 2010102002130A CN 201010200213 A CN201010200213 A CN 201010200213A CN 102268502 A CN102268502 A CN 102268502A
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Abstract
The invention provides a method that various refractory iron ores (slag), reduction coal and lime are placed in a rotary kiln for reduction, so as to prepare industrial spongy iron (TFe>=70-93%, metallization rate>=90-95%) and a baking-free brick raw material, and recover nonferrous metals. A process flow comprises steps of raw material preparation, reduction in the rotary kiln, cooling in a cooling kiln, concentration processing, and briquetting and balling. A granularity of the ore (slag) is no more than 20mm; a coal granularity is less than 15mm; and a lime granularity is no more than 0-2mm. A primary air and a secondary air are employed to combust the coal. A reduction roasting time is 3-10h; a combustion temperature in the kiln is controlled at 1000-1200 DEG C; and water and wind are used for cooling in the cooling kiln. The materials are cooled to a normal temperature under 40 DEG C, and treated with the concentration processing, briquetting and balling, so as to prepare the industrial spongy iron and recover the nonferrous metals. The method of the invention has advantages of simpleness, energy saving, emission reduction, waste reutilization, low production costs, good product quality, green and environmental protection, large market and strong competitiveness; besides the method has good economic benefits as well as good social benefits, and solves a domestic technical problem of refractory iron ore and an environmental protection problem of changing waste into valuables.
Description
Technical field
The present invention relates to a kind of usefulness and revert back rotary kiln and directly handle difficulty and select rhombohedral iron ore, limonite, pyrrhosiderite, spathic iron ore, weak magnetite, and iron slag is produced the method for industrial sponge iron.
Background technology
China has the different nonmagnetic difficulties of a lot of grades to select rhombohedral iron ore, limonite, pyrrhosiderite, spathic iron ore, and weak magnetite Mineral resources, because the ore dressing difficulty is big, can't exploit utilization always; Also have some ferruginous smeltings, chemical sludge to be piled into the mountain in addition, ferro element wherein and some non-ferrous metals can't utilize, and serious environment pollution, the waste resource.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcoming, a kind of mechanization degree height is provided, reduction temperature is low, can handle multiple refractory iron ore and waste residue, and can add the sweetening agent desulfurization, energy-conservation, as the to economize coal rotary kiln that reverts back, furnace charge reduces through rotary kiln, secluding air cools off fast in cooling kiln, and furnace charge waits selected processing to obtain the technical grade sponge iron through the magnetic separation again of magnetic separation ore grinding.No magnetic fine powder foam is made non-burning brick raw material.Can become the abandoned mine mountain and be the mine of living, the change waste residue is product, eliminates secondary pollution, and the protection environment is a kind of new and high technology smelting choosing method.
Technical scheme of the present invention is with the iron ore of component (slag), goes back raw coal and lime, places rotary kiln by weight ratio, produces industrial sponge iron and non-burning brick raw material.Its composition weight proportioning is: iron ore (slag) 20～80 minutes, go back 4～25 parts in raw coal, and lime is: 0.1～2 part.
Production process of the present invention is: preparation of raw material, rotary kiln reduction, cooling kiln cooling, selected processing, briquetting balling-up.
Concrete steps are as follows:
A, raw material configuration
With iron content 18～70%, the various iron ores (slag) of sulfur-bearing 0.01～1.5% are pulverized granularity≤20mm for major ingredient.Join sulfur-bearing≤0.25～0.5%, phosphorus≤0.03%, thermal value 〉=5800～7500 kilocalorie/kilograms, agglomerating index≤3 (noncoking), the coal of fugitive constituent 〉=32% is as going back raw coal and fuel coal powder injection, coal is pulverized, granularity≤15mm, join sulfur-bearing≤0.01～0.03%, the lime of phosphorus≤0.01～0.03% is sweetening agent, lime granularity≤0.～2mm, iron ore (slag), also the weight proportion of raw coal and three kinds of compositions of lime is: iron ore (slag): 20～80 parts, go back raw coal: 4～25 parts, and lime: 0.1～2 part.
B, rotary kiln reduction
According to the weight proportion of component, with various iron ores (slag), go back raw coal and lime, in the kiln tail mixing adding kiln of rotary kiln, carry out reducing roasting.Then with 5～8 parts of fuel coal powder injections, spray in the kiln with coal spouting gun from the kiln hood of rotary kiln and to burn, add pressurized air simultaneously, its air quantity is 10～50m
3/ minute, blast is controlled at 30000～150000Pa.Carry out the secondary air feed in kiln, utilization is contained in kiln Middle pressure draught fan and the interior heat-resistance stainless steel airduct of kiln on one's body and carries out the secondary air feed, and its air quantity is 0.4～16m
3/ minute, blast 5000～18000Pa.Kiln hood keeps micro-pressure operation, and pressure-controlling is at 40～80Pa, and maturing temperature is controlled at 1000～1200 ℃ in the kiln, and the reducing roasting time is: 3～10 hours.
C, cooling kiln cooling
The good metallic iron of reduction enters with material and carries out secluding air in the cooling kiln and cool off fast, and for preventing the metallic iron re-oxidation, cooling kiln adopts outer water spray and blowing that material is cooled to normal temperature below 40 ℃, send selected processing again.
D, selected processing
Cooled material carries out magnetic separation earlier, separates Armco magnetic iron and nonmagnetics, and Armco magnetic iron is through ore grinding again, and the way of magnetic separation is purified to commercial grade sponge iron index with iron again.No magnetic fine powder foam is as non-burning brick raw material.
E, briquetting balling-up
With iron sponge powder with the balling-up of physical method briquetting the ball product.
The present invention's energy manufacture can also reclaim other non-ferrous metal simultaneously with sponge iron (TFe 〉=70～93, degree of metalization 〉=90%～95%) and non-burning brick raw produce.
The present invention is unprecedented, and no prior art is comparable, have energy-conservation, reduce discharging, turn waste into wealth, make the mine of become living, abandoned mine mountain, the change waste material is product.
The inventive method is simple, energy-conservation, reduce discharging, sharp useless, production cost is low, good product quality, environmental protection, the market competitiveness is strong, helps large-scale industrial production, and favorable economic benefit is promptly arranged, and good social benefit is arranged again.The technical barrier of domestic refractory iron ore and an environmental protection difficult problem that turns waste into wealth have been solved.
Embodiment
A, preparation of raw material
With iron content 18～70%, the various iron ores (slag) of sulfur-bearing 0.01～1.5% are pulverized for major ingredient, granularity≤20mm, join sulfur-bearing≤0.25～0.5%, phosphorus≤0.03%, thermal value 〉=5800～7500 kilocalorie/kilograms, agglomerating index≤3 (noncoking), the coal of fugitive constituent 〉=32% is pulverized granularity≤15mm as going back raw coal and fuel coal powder injection to coal.Join sulfur-bearing≤0.01～0.03%, the lime of phosphorus≤0.01～0.03% is sweetening agent, lime granularity≤0～2mm.
The weight proportion that iron ore (slag) is gone back raw coal and three kinds of compositions of lime is that 20～80 parts of iron ores (slag) are gone back 4～25 parts in raw coal, lime: 0.1～2 part.
Get 80 parts of iron ores (slag) in the present embodiment; Also raw coal is 12 parts, 1.2 parts in lime.
B, rotary kiln reduction
According to the weight proportion of component,, go back raw coal and lime and in the kiln tail mixing adding kiln of rotary kiln, carry out reducing roasting various iron ores (slag).Then 5～8 parts of kiln hoods from rotary kiln of fuel coal powder injection are sprayed in the kiln with coal spouting gun and burn, add pressurized air simultaneously, its air quantity is 10～50m
3/ minute, blast is controlled at 30000～150000Pa.Carry out the secondary air feed in kiln, utilization is contained in kiln Middle pressure draught fan and the interior heat-resistance stainless steel airduct of kiln on one's body and carries out the secondary air feed, and its air quantity is 0.4～16m
3/ minute, blast 5000～18000Pa.Kiln hood keeps micro-pressure operation, and pressure-controlling is at 40～80Pa, and maturing temperature is controlled at 1000～1200 ℃ in the kiln, and the reducing roasting time is: 3～10 hours.
C, cooling kiln cooling
The good metallic iron of reduction enters with material and carries out secluding air in the cooling kiln and cool off fast, and for preventing the metallic iron re-oxidation, cooling kiln adopts outer water spray and blowing that material is cooled to normal temperature below 40 ℃, send selected processing again.
D, selected processing
Cooled material carries out magnetic separation earlier, separates Armco magnetic iron and nonmagnetics, and Armco magnetic iron is through ore grinding again, and the way of magnetic separation is purified to technical grade sponge iron index with iron again.No magnetic fine powder foam is as non-burning brick raw material.(reclaiming non-ferrous metal simultaneously)
E, briquetting balling-up
With iron sponge powder with the balling-up of physical method briquetting, the ball product.The present invention's energy manufacture can also reclaim other non-ferrous metal simultaneously with sponge iron (TFe 〉=70～93%, degree of metalization 〉=90%～95%) and non-burning brick raw produce.
Claims (1)
1. a utilization reverts back the various difficulties of the direct processing of rotary kiln and selects rhombohedral iron ore, limonite, pyrrhosiderite, spathic iron ore, weak magnetite, and various iron slag is produced the method for industrial sponge iron (TFe 〉=70～93% degree of metalization 〉=90～95%) and non-burning brick raw material.
It is characterized in that described production method operation is to comprise: preparation of raw material, rotary kiln reduction, cooling kiln cooling; Selected processing; The briquetting balling-up.
Concrete steps are as follows:
A, preparation of raw material
With iron content 18～70%, sulfur-bearing 0.01～1.5% various iron ores (slag) are pulverized granularity≤20mm for major ingredient.Join sulfur-bearing≤0.25～0.5%, phosphorus≤0.03%, thermal value 〉=5800～7500 kilocalorie/kilograms, agglomerating index≤3 (noncoking), the coal of fugitive constituent 〉=32% is pulverized coal as going back raw coal and fuel coal powder injection, granularity≤15mm, join sulfur-bearing≤0.01～0.03%, the lime of phosphorus≤0.01～0.03% is sweetening agent, lime granularity≤0～2mm.Iron ore (slag), the weight proportion of going back raw coal and three kinds of compositions of lime is: 20～80 parts in iron ore (slag), go back 4～25 parts in raw coal, 0.1～2 part in lime.
B, rotary kiln reduction
According to the weight proportion of component, with various iron ores (slag), go back raw coal and lime, in the kiln tail mixing adding kiln of rotary kiln, carry out reducing roasting.Then with 5～8 parts of fuel coal powder injections, spray in the kiln with coal spouting gun from the kiln hood of rotary kiln and to burn, add pressurized air simultaneously, its air quantity is 10～50m
3Divide and plant, blast is controlled at 30000～150000Pa.Carry out the secondary air feed in kiln, utilization is contained in kiln Middle pressure draught fan and the interior heat-resistance stainless steel airduct of kiln on one's body and carries out the secondary air feed, and its air quantity is 0.4～16m
3/ minute, blast 5000～18000Pa.Kiln hood keeps micro-pressure operation, and pressure-controlling is at 40～80Pa, and maturing temperature is controlled at 1000～1200 ℃ in the kiln; The reducing roasting time is: 3～10 hours.
C, cooling kiln cooling
The good metallic iron of reduction enters with material and carries out secluding air in the cooling kiln and cool off fast, and for preventing the metallic iron re-oxidation, cooling kiln adopts outer water spray and blowing that material is cooled to normal temperature below 40 ℃, send selected processing again.
D, selected processing
Cooled material carries out magnetic separation earlier, separates Armco magnetic iron and nonmagnetics, and Armco magnetic iron is through ore grinding again, and the way of magnetic separation is purified to the commercial grade sponge iron with iron again, and no magnetic fine powder foam is as non-burning brick raw material, (reclaiming non-ferrous metal simultaneously).
E, briquetting balling-up
With iron sponge powder with the balling-up of physical method briquetting the ball product, the inventive method is simple, energy-conservation, reduce discharging, sharp useless, production cost is low, good product quality, environmental protection, market is big, and competitive power is strong, helps large-scale industrial production, existing favorable economic benefit has good social benefit again.The technical barrier of domestic refractory iron ore and an environmental protection difficult problem that turns waste into wealth have been solved.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010200213.0A CN102268502B (en) | 2010-06-03 | 2010-06-03 | Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln |
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| CN201010200213.0A CN102268502B (en) | 2010-06-03 | 2010-06-03 | Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln |
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| CN102268502A true CN102268502A (en) | 2011-12-07 |
| CN102268502B CN102268502B (en) | 2015-03-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628091A (en) * | 2011-07-12 | 2012-08-08 | 刘元生 | Technology for producing molten iron by three-step method |
| CN102658369A (en) * | 2012-05-18 | 2012-09-12 | 北京科技大学 | Lead slag and coal-based direct reduction method for producing metal iron powder |
| CN103305650A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103789478A (en) * | 2014-01-28 | 2014-05-14 | 酒泉钢铁(集团)有限责任公司 | Method for producing metallized iron powder through carrying out carbon cycle oxygen increasing and direct reduction on massive iron ores |
| CN104004905A (en) * | 2013-02-27 | 2014-08-27 | 宝山钢铁股份有限公司 | Production process for metalized burden suitable for blast furnace ironmaking |
| CN107201420A (en) * | 2017-04-14 | 2017-09-26 | 爱润森德（天津）能源科技有限公司 | The energy comprehensive utilization system and its production technology of a kind of smelting in rotary kiln sponge iron |
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| JPH05170441A (en) * | 1991-04-19 | 1993-07-09 | Amc Mineral Sands Ltd | Convertion of ilumenite into synthetic rutile |
| AU7178096A (en) * | 1995-11-17 | 1997-05-22 | David Martin Menne | Dissolution of iron from reduced ilmenite |
| CN1362308A (en) * | 2001-12-19 | 2002-08-07 | 李维成 | Rotary kiln process of producing reducing ilmenite powder for welding electrode |
| CN101033515A (en) * | 2007-04-16 | 2007-09-12 | 中南大学 | Process for preparing nickel ferroalloy by melting and reducing laterite nickel ore |
| CN101701275A (en) * | 2009-11-18 | 2010-05-05 | 昆明理工大学 | Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores |
Family Cites Families (1)
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| EP2034613A4 (en) * | 2006-05-17 | 2009-08-12 | Nec Corp | Turbo encoder and harq processing method applied for the turbo encoder |
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2010
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05170441A (en) * | 1991-04-19 | 1993-07-09 | Amc Mineral Sands Ltd | Convertion of ilumenite into synthetic rutile |
| AU7178096A (en) * | 1995-11-17 | 1997-05-22 | David Martin Menne | Dissolution of iron from reduced ilmenite |
| CN1362308A (en) * | 2001-12-19 | 2002-08-07 | 李维成 | Rotary kiln process of producing reducing ilmenite powder for welding electrode |
| CN101033515A (en) * | 2007-04-16 | 2007-09-12 | 中南大学 | Process for preparing nickel ferroalloy by melting and reducing laterite nickel ore |
| CN101701275A (en) * | 2009-11-18 | 2010-05-05 | 昆明理工大学 | Method for preparing nickel iron by using rotary kiln for directly reducing nickel silicate ores |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628091A (en) * | 2011-07-12 | 2012-08-08 | 刘元生 | Technology for producing molten iron by three-step method |
| CN102658369A (en) * | 2012-05-18 | 2012-09-12 | 北京科技大学 | Lead slag and coal-based direct reduction method for producing metal iron powder |
| CN104004905A (en) * | 2013-02-27 | 2014-08-27 | 宝山钢铁股份有限公司 | Production process for metalized burden suitable for blast furnace ironmaking |
| CN104004905B (en) * | 2013-02-27 | 2016-03-30 | 宝山钢铁股份有限公司 | A kind of blast furnace ironmaking prereduced burden production technique |
| CN103305650A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103305650B (en) * | 2013-06-25 | 2014-12-24 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103789478A (en) * | 2014-01-28 | 2014-05-14 | 酒泉钢铁(集团)有限责任公司 | Method for producing metallized iron powder through carrying out carbon cycle oxygen increasing and direct reduction on massive iron ores |
| CN107201420A (en) * | 2017-04-14 | 2017-09-26 | 爱润森德（天津）能源科技有限公司 | The energy comprehensive utilization system and its production technology of a kind of smelting in rotary kiln sponge iron |
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