CN208829738U - A kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system - Google Patents
A kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system Download PDFInfo
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Abstract
The utility model metallurgy and mineral engineering technology field, it is a kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system, system capital equipment has the main furnace of venturi drier, suspending magnetization roasting, magnetization roasting furnace, horizontal rotary cooling cylinder etc., after drier is dry in iron ore miberal powder scripture mound and preheating, the main furnace of suspending magnetization roasting is entered to be heated, heating miberal powder enters in magnetization roasting furnace to be restored using coal gas, high-temperature roasting material carries out anaerobic cooling and waste heat recycling by horizontal rotary cooler, and magnetic higher roasted ore can be obtained.Advantage: iron ore suspending magnetization roasting and anaerobic cooling are integrated, the heating of powdery iron ore uses the main furnace of suspending magnetization roasting, high temperature iron ore after magnetizing roast uses cooling using horizontal rotary cooler, the yield and quality of device can be improved, realize that the non-oxidation of high temperature iron ore is cooling.
Description
Technical field
The utility model belongs to metallurgy and mineral engineering technology field, is related to a kind of refractory iron ore suspending magnetization roasting-
Dry type anaerobic cooling system.
Background technique
97% is lean ore in the iron ore reserves in China, and wherein normal reselection, magnetic separation and flotation technology are difficult to be effectively treated
Iron ore resource has nearly 20,000,000,000 tons including limonite, siderite, appositional pattern bloodstone etc..To these refractory iron ores,
The ferriferous oxide of wherein weak magnetic can be converted to ferromagnetic artificial magnet mine by magnetizing roast, be realized followed by low intensity magnetic separation
The separation of iron mineral and gangue, this is the effective ways of refractory iron ore sorting.
In the past few decades, scientific worker has carried out long-term research to refractory iron ore resource utilization issue, especially
Systematic research and exploitation are carried out using magnetic roasting process to refractory iron ore, it was demonstrated that magnetic roasting process is that processing is difficult
Select the effective ways of iron ore of low ore grade.Currently, iron ore magnetic roasting process mainly has shaft furnace magnetic roasting process both at home and abroad
With rotary kiln magnetic roasting process.
Shaft furnace magnetic roasting process is a kind of technique for handling iron ore lump ore (entering 15~100mm of furnace grade), is existed
Main problem have: the iron ore granularity 1. handled is larger, and weight ratio surface area is smaller, thus iron ore and reducing agent
(CO and H2Deng) touch opportunity it is smaller, reduction of iron ore process speed is slow；2. in iron ore magnetizing roast, lump ore surface layer is also
Former degree is higher than center portion, and there is lump ore surface layers and center portion to restore non-uniform phenomenon, and lump ore granularity is bigger, and reduction is uneven
Phenomenon is more serious；3. lump ore enters, furnace particle size differences are larger, and there are small grade lump ore, integrally reduction and big grade lump ore excessively is integrally owed
The problem of reduction.The energy consumption that problems above results in shaft roasting iron ore is larger, roasted ore technical-economic index is poor, raw
It produces at high cost, less economical.
Rotary kiln magnetic roasting process is a kind of technique handled into furnace granularity for 25mm or less iron ore, technical indicator
It to be got well compared with shaft furnace, but there is also the problems, especially rotary kiln production process such as reduction of iron ore quality unevenness, roasting cost height
Middle tail end ring formation, which frequently occurs, to be difficult to persistently maintain normal production.
In terms of iron ore fluidization magnetizing roast, iron ore fluidization heats reduction reaction furnace and using it as the new of core
For type magnetizing roast technology compared with conventional magnetized roasting technology (such as kiln process), maximum difference is will be originally in rotary kiln
Interior accumulation state gas-solid heat exchange and mass transfer are changed into fluidization gas-particle heat transfer and mass transport process, and gas forms material by fluidized bed
Turbulence state forms turbulent flow, gas phase fluidization state under the effect of preheater windspout barrel Tangential Wind power then into preheater
Under mass transport process compared with banking process in rotary kiln, advantage are as follows: (1) Dual-Phrase Distribution of Gas olid contact area under fluidized state
Fast speed larger, that heat exchange, mass transfer and particle chemically react；(2) fluidization preheating device is by multistage gas
The counter-flow heat exchanger that stream unit is composed in series from top to bottom, material turbulivity is higher, temperature difference and reduction between gas-particle two-phase
Gas concentration difference is larger, and comprehensive carry-over factor and transmitting power are larger.
Chinese utility model patent application number 201010621731.X discloses a kind of refractory iron ore powder magnetizing roast
System and roasting technique, the utility model using recirculating fluidized bed to refractory iron ore powder carry out magnetizing roast, roast tail
Gas is changed after the latent heat of combustion chambers burn release unreacting gas by 3~5 grades of cyclone preheaters and room temperature iron ore powder
Heat receives the sensible heat and latent heat of baking tail gases by preheating iron ore powder back and forth.Main problem existing for the technical solution, first is that
Iron ore powder maturing temperature is lower, is unfavorable for the roasting of iron ore fast-magnetic；Second is that the sensible heat to high-temperature roasting mine does not have
Effect recycles；Third is that system needs to consume a large amount of Gas Resource；Fourth is that system evaporates in roasting process in the presence of knot and defluidization
Problem.
Utility model content
The utility model in order to solve the above technical problems, proposes a kind of refractory iron ore suspending magnetization roasting-dry type anaerobic
Cooling system.
The technical solution of the utility model includes: a kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system, includes
Equipment have: raw material ore storage bin, electronic quantitative batcher, screw feeder, venturi drier, raw material cyclone dust collectors, cloth bag
The main furnace of deduster, exhaust fan, chimney, suspending magnetization roasting, fuel gas combustion system, non-direct contact material cooling cylinder, air blower,
Magnetization roasting furnace, heated material cyclone dust collectors；Iron ore miberal powder is fed after coming out from Raw Ore bin discharge port external through electronic quantitative
Machine weighs, and weighs iron ore miberal powder and flows into screw feeder, screw feeder is that venturi drier supplies iron ore miberal powder, text
Drier discharge port is connected to the import of raw material cyclone dust collectors, the upper gas outlet of raw material cyclone dust collectors and cloth by pipeline in mound
The import of bag dust collector is connected by pipeline, and the gas outlet of bag filter is connected to chimney through exhaust fan；Raw material cyclone dust removal
The bottom discharge port of device is connected to the import of the main furnace of suspending magnetization roasting by pipeline, and the main furnace lower part of suspending magnetization roasting is passed through sky
Gas by fuel gas combustion system inputs coal gas simultaneously, the upper part discharge port and heated material cyclone dust removal of the main furnace of suspending magnetization roasting
The import of device is connected to by pipeline, and the top gas outlet of heated material cyclone dust collectors is connected to venturi drier by pipeline
Air inlet；Heated material cyclone dust collectors bottom discharge port is connected to the feed inlet of magnetization roasting furnace, and magnetization roasting furnace is passed through also
Rough gas, magnetization roasting furnace generate coal gas, calcining after reduction, and coal gas is sent under the main furnace of suspending magnetization roasting by pipeline after reduction
Portion moves into the cooling of non-direct contact material cooling cylinder as fuel, calcining.
The main furnace lower part of suspending magnetization roasting is also connected with auxiliary burner, and auxiliary burner is as fuel gas combustion system
Stand-by equipment.
The non-direct contact material cooling cylinder is horizontal rotary cooler, is divided into air indirect heat exchange area and water cooling is indirect
Heat transfer zone, and cylinder is driven by rotating transmission device and is rotated, air indirect heat exchange area is equipped with air and passes through pipe, water cooling indirect heat exchange
Area is equipped with water pipe, and air indirect heat exchange area blasts normal temperature air by air blower, and normal temperature air is inhaled behind air indirect heat exchange area
Heat becomes high temperature combustion air, and high temperature combustion air, into the main furnace lower part of suspending magnetization roasting, is mentioned through connecting pipe for gas-fired
Oxygen；Water cooling indirect heat exchange area accesses water pipe, and water absorbs heat behind water cooling indirect heat exchange area becomes steam.
The beneficial effects of the utility model are: 1, the roasting of heated material be divided into two processes carry out, in iron ore
Crystallization water removal is decomposed with siderite to be carried out in the main furnace of suspending magnetization roasting, Fe in iron ore2O3Reduction is in magnetization roasting furnace
It carries out, shortens the time of iron ore magnetizing roast.2, the cooling of high-temperature roasting mine is cooling using non-direct contact material, realizes
The non-oxidation of high temperature iron ore is cooling.3, horizontal rotary cooler is further used, air indirect heat exchange area and water cooling are divided into
Indirect heat exchange area uses the form of normal temperature air indirect heat exchange in horizontal rotary cooler temperature end, in horizontal rotary cooler
Low-temperature end uses the form of condensed water indirect heat exchange, and the waste heat of high-temperature roasting mine can be made to be recycled to greatest extent, leads to simultaneously
It crosses indirect heat exchange and obtains clean high temperature air and high-temperature steam, reach the main furnace of suspending magnetization roasting and reach continuous and stable production
Purpose.
Detailed description of the invention
Fig. 1 is the utility model device relational graph；
Fig. 2 is horizontal rotary cooler arrangement structure chart；
Fig. 3 is the utility model process flow chart；
Appended drawing reference in figure: 1- raw material ore storage bin, 2- electronic quantitative batcher, 3- screw feeder, 4- venturi drier,
5- raw material cyclone dust collectors, 6- bag filter, 7- exhaust fan, 8- chimney, the main furnace of 9- suspending magnetization roasting, 10- fuel gas buring
System, 11- non-direct contact material cooling cylinder, 12- air blower, 13- magnetization roasting furnace, 14- heated material cyclone dust collectors,
15- air indirect heat exchange area, 16- water cooling indirect heat exchange area, 17- auxiliary burner, 18- rotating transmission device, 19- rotation cooling
Cylinder, 20- heat exchange pipeline, 21- rotary joint, the cooling water inlet 22-.
Specific embodiment
A kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system, the equipment for including have: raw material ore storage bin 1, electricity
Sub- constant feeder 2, screw feeder 3, venturi drier 4, raw material cyclone dust collectors 5, bag filter 6, exhaust fan 7,
The main furnace 9 of chimney 8, suspending magnetization roasting, fuel gas combustion system 10, non-direct contact material cooling cylinder 11, air blower 12, Roasting
Burn furnace 13, heated material cyclone dust collectors 14；Iron ore miberal powder from 1 discharge port of raw material ore storage bin come out after through electronic quantitative batcher
2 weigh, and weigh iron ore miberal powder and flow into screw feeder 3, and screw feeder 3 is that venturi drier 4 supplies iron ore miberal powder,
4 discharge port of venturi drier is connected to the import of raw material cyclone dust collectors 5, the upper outlet of raw material cyclone dust collectors 5 by pipeline
Mouth is connected with the import of bag filter 6 by pipeline, and the gas outlet of bag filter 6 is connected to chimney 8 through exhaust fan 7；It is former
The bottom discharge port of material cyclone dust collectors 5 is connected to the import of the main furnace 9 of suspending magnetization roasting by pipeline, suspending magnetization roasting master
9 lower part of furnace be passed through air, simultaneously by fuel gas combustion system 10 input coal gas, the upper part discharge port of the main furnace 9 of suspending magnetization roasting with
The import of heated material cyclone dust collectors 14 is connected to by pipeline, and the top gas outlet of heated material cyclone dust collectors 14 passes through pipe
The air inlet of road connection venturi drier 4；14 bottom discharge port of heated material cyclone dust collectors and magnetization roasting furnace 13 into
Material mouth connection, magnetization roasting furnace 13 are passed through reducing gas, and magnetization roasting furnace 13 generates coal gas, calcining after reduction, coal gas after reduction
Main 9 lower part of furnace of suspending magnetization roasting, which is sent into, as fuel, calcining by pipeline moves into the cooling of non-direct contact material cooling cylinder 11.
Main 9 lower part of furnace of suspending magnetization roasting is also connected with auxiliary burner 17, and auxiliary burner 17 is fired as combustion gas
The stand-by equipment of burning system 10.
Non-direct contact material cooling cylinder 11 uses horizontal rotary cooler, is divided between air indirect heat exchange area 15 and water cooling
Heat transfer zone 16 is connect, and cylinder drives rotation (using gear drive or friction auxiliary driving) by rotating transmission device 18, air is indirect
Heat transfer zone 15 is equipped with air and is equipped with water pipe by pipe, water cooling indirect heat exchange area 16, and air is all heat exchange pipeline by pipe, water pipe
20, due to make the rotation of rotation cooling cylinder 19, heat exchange pipeline 20 motionless with respect to ground, air is needed to pass in and out by pipe, water pipe
One section of installation rotary joint 21, air indirect heat exchange area 15 blast normal temperature air by air blower 12, and normal temperature air passes through between air
Connecing heat absorption behind heat transfer zone 15 becomes high temperature combustion air, and high temperature combustion air is through connecting pipe under the main furnace 9 of suspending magnetization roasting
Portion provides oxygen for gas-fired；Water cooling indirect heat exchange area 16 accesses water pipe, and water is passed into from cooling water inlet 22 between water cooling
Heat absorption becomes steam after connecing heat transfer zone 16.
Use process: (1) by granularity be -200 mesh account for room temperature iron ore miberal powder that 40% or more, water content is 10-12% by
Raw material ore storage bin 1 is transported in venturi drier 4 through electronic quantitative batcher 2, screw feeder 3, useless in 670 DEG C or so heating
Under the action of gas, after miberal powder is dried and is preheating to 150 DEG C or so, exhaust gas and miberal powder form raw material Dual-Phrase Distribution of Gas olid.
(2) raw material Dual-Phrase Distribution of Gas olid is transported in raw material cyclone dust collectors 5, and wherein most miberal powder enters after being collected
In the main furnace 9 of suspending magnetization roasting, the dust-laden exhaust gas of discharge is sent in bag filter 6 and is dusted.From 6 row of bag filter
Pure air out is discharged after the pressurization of exhaust fan 7 by chimney 8, and the Mineral Dusts that bag filter 6 is collected are discharged from ash discharging hole
Returning charge utilization is carried out afterwards.
(3) dry miberal powder is after main 9 feed inlet of the furnace addition of suspending magnetization roasting, under bottom blowout high-temperature flue gas effect,
Miberal powder is blown afloat on fluidized bed and forms Dual-Phrase Distribution of Gas olid.Dual-Phrase Distribution of Gas olid in the main furnace 9 of suspending magnetization roasting from lower to upper
Suspend flowing, is heated to 670 DEG C or so by high-temperature flue gas in iron ore powder flow process, the crystallization water and siderite in material into
Row decomposes, and the Dual-Phrase Distribution of Gas olid of preroast flows out at the top of the main furnace 9 of suspending magnetization roasting to heated material cyclone dust removal
In device 14, the high-temperature material being discharged from 14 bottom of heated material cyclone dust collectors is entered directly into magnetization roasting furnace 13.
(4) in fuel gas combustion system 10, from coal gas after the room temperature coal gas that is passed through of outside and reduction with it is cold from horizontal rotary
But it burns after the high temperature combustion air mixing of device discharge, 700-720 DEG C of high-temperature flue gas of generation is passed into suspension Roasting
It burns in main furnace 9.The powdery iron ore in the main furnace 9 of suspending magnetization roasting is added under high-temperature flue gas effect, it can be in the 2-3s time
The interior iron ore powder after preheating is heated to 670 DEG C or so.
(5) after heated material is added at the top of magnetization roasting furnace 13, under the reducing gas effect that its bottom is passed through, heating
The CO and H after goods fluid and in coal gas2Under effect, by the reduction of time 10-20S, Fe in heated material can be made2O3Reduction
For Fe3O4, 560 DEG C or so of calcining is obtained after heated material reduction.
(6) calcining enters in horizontal rotary cooler, in material rotary course when passing through air indirect heat exchange area 15
Heat exchange is carried out with the normal temperature air that air blower 12 blasts, air themperature can be made to be increased to 400-500 DEG C, temperature of charge drops to
600 DEG C or so, the air after preheating is utilized as the combustion air of fuel gas combustion system；Material changes indirectly by water cooling
Heat exchange is carried out with condensed water when hot-zone, 300-350 DEG C of high-temperature steam can be obtained, temperature of charge is made after dropping to 200 DEG C or less
It is utilized for roasted ore, steam can be supplied to cogeneration and be utilized.
The utility model integrates the main furnace of refractory iron ore suspending magnetization roasting, magnetization roasting furnace and horizontal rotary cooler
Together, powdery iron ore heating using the main furnace of suspending magnetization roasting, it can be achieved that quickly, be evenly heated and improve single furnace output.
High temperature iron ore after magnetization roasting furnace reduction is cooled down using horizontal rotary cooler, and 560 DEG C or so iron ores can be made to exist
It is cooled down in the case of not contacted with air, while its heat obtains whole recyclings, realizes the anaerobic of high temperature iron ore
Change cooling, improves the magnetism of roasted ore.
Further, the roasting of heated material is divided into two processes and carried out by the utility model, the crystallization water in iron ore
Removal is decomposed with siderite and is carried out in the main furnace of suspending magnetization roasting, Fe in iron ore2O3Reduction carries out in magnetization roasting furnace,
Reduction of iron ore is with the H in coal gas2It is reducing agent with CO, shortens the time of iron ore magnetizing roast.
Further, refractory iron ore miberal powder is first carried out oxidation roasting in the main furnace of suspending magnetization roasting by the utility model
It burns, the Fe in iron ore can be made3O4Initial oxidation roasting generates Fe2O3, oxide ore enters back into magnetization roasting furnace and restored,
It can make Fe in iron ore2O3It is reduced to newborn Fe3O4, be conducive to Fe3O4Crystal grain is grown up, so that improving subsequent mill selects process
Metal recovery rate.
Further, the main furnace fuel of the utility model suspending magnetization roasting using coal gas and reduction after coal gas, coal gas and also
Coal gas and high temperature combustion air mix after-combustion in fuel gas combustion system and generate high-temperature flue gas after original, flue-gas temperature by adjusting
Coefficient of excess air makes its control be 700-720 DEG C, and high-temperature flue gas is re-fed into the main furnace of suspending magnetization roasting and carries out iron ore
Heating can avoid iron ore and contact in reduction process with thermal-flame and generate low melting point, reaches suspending magnetization roasting
The purpose of main furnace continuous and stable production.
Further, horizontal rotary cooler is used tubulose indirect heat exchanger by the utility model, and air or cooling water exist
Pipeline internal flow, high-temperature material is flowing between pipeline external in cooling cylinder, high under the turning effort of horizontal type cooler
Warm material comes into full contact with pipeline outer wall, and for high-temperature material itself heat transfer to pipeline outer wall, pipeline outer wall passes through biography again
Conduction heat transfer mode transfers heat to inner wall of the pipe, and inner wall of the pipe transfers heat to sky by convection current and conduction heat transfer mode again
Gas or cooling water, the anaerobic for realizing iron ore are cooling.The cooling clean high temperature air generated of material is sent to fuel gas buring simultaneously
System, can make the main furnace of suspending magnetization roasting do not tie stay in the case where steady operation.
Further, the utility model is the heat transfer efficiency for improving horizontal rotary cooler, by horizontal rotary cooler point
For air indirect heat exchange area and water cooling indirect heat exchange area, normal temperature air indirect heat exchange is used in horizontal rotary cooler temperature end
Form uses the form of condensed water indirect heat exchange in horizontal rotary cooler low-temperature end, the waste heat of high-temperature roasting mine can be made to obtain
Recycling to greatest extent.
Claims (3)
1. a kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system, the equipment for including have: raw material ore storage bin (1), electricity
Sub- constant feeder (2), screw feeder (3), venturi drier (4), raw material cyclone dust collectors (5), bag filter
(6), exhaust fan (7), chimney (8), it is characterized in that: further including the main furnace of suspending magnetization roasting (9), fuel gas combustion system (10), non-
Direct contacting material cooling cylinder (11), air blower (12), magnetization roasting furnace (13), heated material cyclone dust collectors (14)；Iron ore
Stone ore powder from raw material ore storage bin (1) discharge port come out after through electronic quantitative batcher (2) weigh, weigh iron ore miberal powder flow into spiral
Dispenser (3), screw feeder (3) are that venturi drier (4) supply iron ore miberal powder, venturi drier (4) discharge port
By the import of pipeline connection raw material cyclone dust collectors (5), the upper gas outlet of raw material cyclone dust collectors (5) and bag filter
(6) import is connected by pipeline, and the gas outlet of bag filter (6) is connected to chimney (8) through exhaust fan (7)；Raw material whirlwind
The bottom discharge port of deduster (5) is connected to the import of the main furnace of suspending magnetization roasting (9) by pipeline, the main furnace of suspending magnetization roasting
(9) lower part is passed through air, simultaneously by fuel gas combustion system (10) input coal gas, the upper outlet of the main furnace of suspending magnetization roasting (9)
Mouth is connected to the import of heated material cyclone dust collectors (14) by pipeline, the top outlet of heated material cyclone dust collectors (14)
The air inlet that mouth passes through pipeline connection venturi drier (4)；Heated material cyclone dust collectors (14) bottom discharge port and magnetization
The feed inlet of roaster (13) is connected to, and magnetization roasting furnace (13) is passed through reducing gas, and magnetization roasting furnace (13) generates coal after reduction
Gas, calcining, coal gas is moved by the pipeline feeding main furnace of suspending magnetization roasting (9) lower part as fuel, calcining indirect after reduction
Contacting material cooling cylinder (11) is cooling.
2. a kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system according to claim 1, feature
Be: the main furnace of suspending magnetization roasting (9) lower part is also connected with auxiliary burner (17), and auxiliary burner (17) is fired as combustion gas
The stand-by equipment of burning system (10).
3. a kind of refractory iron ore suspending magnetization roasting-dry type anaerobic cooling system according to claim 1, feature
Be: the non-direct contact material cooling cylinder (11) is horizontal rotary cooler, is divided into air indirect heat exchange area (15) and water cooling
Indirect heat exchange area (16), and cylinder by rotating transmission device drive rotate, air indirect heat exchange area (15) be equipped with air by pipe,
Water cooling indirect heat exchange area (16) is equipped with water pipe, and air indirect heat exchange area (15) blasts normal temperature air by air blower (12), and room temperature is empty
Gas absorbs heat behind air indirect heat exchange area (15) becomes high temperature combustion air, and high temperature combustion air is through connecting pipe into suspension magnetic
Change and roast main furnace (9) lower part, provides oxygen for gas-fired；Water cooling indirect heat exchange area (16) accesses water pipe, and water passes through between water cooling
Connecing heat transfer zone (16) and absorbing heat afterwards becomes steam.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111057838A (en) * | 2019-12-23 | 2020-04-24 | 中国科学院过程工程研究所 | High-phosphorus hematite and limonite fluidized roasting system and method |
| CN115287452A (en) * | 2022-08-25 | 2022-11-04 | 上海逢石科技有限公司 | Auxiliary cooling process for reducing calcine of high-temperature powdery iron ore |
| CN116753712A (en) * | 2023-08-21 | 2023-09-15 | 山西大地民基生态环境股份有限公司 | Mixed powder treatment device for recycling red mud |
-
2018
- 2018-06-15 CN CN201820934492.5U patent/CN208829738U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111057838A (en) * | 2019-12-23 | 2020-04-24 | 中国科学院过程工程研究所 | High-phosphorus hematite and limonite fluidized roasting system and method |
| CN115287452A (en) * | 2022-08-25 | 2022-11-04 | 上海逢石科技有限公司 | Auxiliary cooling process for reducing calcine of high-temperature powdery iron ore |
| CN116753712A (en) * | 2023-08-21 | 2023-09-15 | 山西大地民基生态环境股份有限公司 | Mixed powder treatment device for recycling red mud |
| CN116753712B (en) * | 2023-08-21 | 2023-10-20 | 山西大地民基生态环境股份有限公司 | Mixed powder treatment device for recycling red mud |
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