CN104329945A - Iron ore magnetic roasted ore waste heat recovery process and iron ore magnetic roasted ore waste heat recovery equipment - Google Patents
Iron ore magnetic roasted ore waste heat recovery process and iron ore magnetic roasted ore waste heat recovery equipment Download PDFInfo
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- CN104329945A CN104329945A CN201410566257.3A CN201410566257A CN104329945A CN 104329945 A CN104329945 A CN 104329945A CN 201410566257 A CN201410566257 A CN 201410566257A CN 104329945 A CN104329945 A CN 104329945A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an iron ore magnetic roasted ore waste heat recovery process which comprises the following steps: 1) spraying water to high-temperature iron ore magnetic roasted ore by use of a single-cylinder cooling machine with a built-in water spraying device so as to rapidly cool the high-temperature iron ore magnetic roasted ore to 450-500 DEG C; 2) air-cooling the iron ore magnetic roasted ore, which is rapidly cooled to 450-500 DEG C by use of a grate cooling machine or the single-cylinder cooling machine, to be less than 100 DEG C and inducing hot air discharged from the grate cooling machine or the single-cylinder cooling machine to magnetic roasting equipment so as to serve as combustion-supporting air for fuel combustion. The invention also discloses equipment for realizing the iron ore magnetic roasted ore waste heat recovery process. The equipment has an iron ore high-temperature magnetic roasted ore anaerobic cooling and waste heat recovery functions, is capable of ensuring the iron ore magnetic roasted ore quality, realizing waste heat recovery of high-temperature magnetic roasted ore, greatly reducing the roasting heat consumption, reducing the ore dressing cost and improving the fieldwork environment, and has the characteristics of energy conservation and environmental friendliness.
Description
Technical field
The invention belongs to iron ore dressing technical field, be specifically related to a kind of iron ore magnetizing roast ore deposit waste heat reclaiming process and equipment.
Background technology
China's iron ore deposit enriches, but rich ore is few, lean ore is many, and population mean grade, about 30 ~ 33%, just need can reach the grade requirement of commercial Application level through complicated ore dressing process.Moreover, the valuable mineral in most ore be particulate to fine grain teeth cloth, and ore type is complicated, and Associated Constituents is many, therefore beneficiation cost is high.This low-grade iron ore resource causing China a large amount of on the one hand cannot effectively be developed, and causes the serious waste of mineral resources; Result also in the external import (external dependence degree of current China iron ore is more than 60%) of a large amount of iron ore on the other hand, the fluctuation of iron ore international market price is stern challenge to economic security of the country and industrial economy benefit.
Conventional beneficiation method has gravity treatment, magnetic separation, flotation and combined process flow, magnetizing roast-low intensity magnetic separation etc.And for weak-magnetic iron ore mineral, magnetizing roast-low intensity magnetic separation technology is effective beneficiation method; Magnetizing roast equipment mainly contains shaft furnace, rotary kiln, fluidized bed furnace, flash roaster etc.Because magnetic iron ore ferromagnetic after roasting at high temperature contacts the bloodstone easily being become weak magnetic by secondary oxidation with air, affect grade and the rate of recovery of magnetic concentrate, and then affect beneficiation cost, therefore need rapidly it to be cooled in weakly reducing atmosphere or in the neutral environment of isolated air.
At present, the most frequently used type of cooling is also the method that current industrial adopts, and is directly to be poured in pond by roasted ore to carry out water seal cooling.The advantage of this type of cooling is: the type of cooling is simple, good cooling results, but shortcoming needs to consume a large amount of water, the dust-containing water steam produced makes work on the spot bad environments, and the waste heat after roasting also can not be recycled, cause the loss of energy, considerably increase beneficiation cost.Chinese invention patent application 201410041638.X discloses the cooling of a kind of iron ore magnetizing roast product anaerobic and exhaust heat recovering method, is loaded on the top of the high-temperature material after roasting from shaft cooler, selects CO or H
2volume content is not more than the blast furnace gas of 30%, passes into from shaft cooler bottom, gas material countercurrent flow in shaft cooler, and material is cooled, and blast furnace gas temperature raises, and realizes recycling residual heat.The cooling medium of this process choice is blast furnace gas, not easily obtains; And cooling device is shaft cooler, has certain restriction to raw meal particle size; No matter from cooling medium or the selection of cooling device, all not there is versatility, greatly limit the application of the method in ore dressing field.Therefore, develop a kind of high-temperature roasting ore deposit waste heat reclaiming process and the equipment that can be widely used in magnetizing roast technical field, reduce roasting hear rate, improve work on the spot environment, to the reduction of iron ore dressing cost and to promote the Environmental Protection Level of magnetizing roast technical field significant.
Summary of the invention
The present invention is directed to the technical problem existed in prior art, there is provided a kind of iron ore magnetizing roast ore deposit waste heat reclaiming process and equipment, this Processes and apparatus can effectively reduce roasting hear rate, and then reduces beneficiation cost, improve work on the spot environment, there is energy-conserving and environment-protective, widely used feature.
The present invention is directed to the technical scheme that the technical problem that exists in prior art takes is: a kind of iron ore magnetizing roast ore deposit waste heat reclaiming process, adopts following steps:
One) adopt the single cylinder cooling machine of band built-in water injector that high temperature iron ore magnetizing roast ore deposit water spray is chilled to 450 ~ 500 DEG C;
Two) adopt grate-cooler or single cylinder cooling machine by air-cooled to less than 100 DEG C for the iron ore magnetizing roast ore deposit being chilled to 450 ~ 500 DEG C, the hot blast going out grate-cooler or single cylinder cooling machine is introduced roasting apparatus, as the combustion air of fuel combustion simultaneously.
The present invention is directed to another technical scheme that the technical problem that exists in prior art takes is: a kind of equipment realizing above-mentioned iron ore magnetizing roast ore deposit waste heat reclaiming process, comprise and be with the single cylinder cooling machine of built-in water injector and the grate-cooler of series connection with it or single cylinder cooling machine, the charging aperture of the single cylinder cooling machine of the built-in water injector of described band is connected with magnetizing roast equipment discharge port, and discharging opening is connected with the charging aperture of described grate-cooler or single cylinder cooling machine; Described grate-cooler or single cylinder cooling machine are provided with hot-blast outlet, and the hot-blast outlet of grate-cooler or single cylinder cooling machine is by sirocco reclamation airduct and magnetizing roast equipment connection; The single cylinder cooling machine inside of the built-in water injector of described band arranges water pipeline and air draft pipe, and described water pipeline is connected with water injection system, and described air draft pipe is connected with steam treatment system.
The spill firebrick that the feed end inner surface of the single cylinder cooling machine of the built-in water injector of described band is not waited by thickness is formed.
The water exit position of described water pipeline is arranged on the feed end of the single cylinder cooling machine of the built-in water injector of described band.
Described sirocco reclamation pipe is provided with dust-precipitator.
Described sirocco reclamation pipe is provided with blower fan.
Described sirocco reclamation pipe is provided with valve.
Described magnetizing roast equipment is any one in shaft furnace, rotary kiln, fluidized bed furnace and flash roaster.
Described water pipeline is provided with injection flow rate adjusting device.
The beneficial effect that the present invention has is: the present invention has the function of the anaerobic cooling of high temperature magnetization roasted ore and waste heat recovery concurrently, and can improve work on the spot environment.The high-temperature roasting ore deposit going out magnetizing roast equipment, by spraying water to 450 ~ 500 DEG C in the single cylinder cooling machine of band water injector, realizes the anaerobic cooling in magnetizing roast ore deposit; The steam of generation is drawn to steam treatment system by air draft pipe, prevents steam from entering magnetizing roast equipment, affects the normal operation of magnetizing roast equipment; Single cylinder cooling machine outlet 450 ~ 500 DEG C of roasted ores with water injector carry out recuperation of heat by grate-cooler or single cylinder cooling machine, reclaim sensible heat and Fe that heat stems from 450 ~ 500 DEG C of roasted ores
3o
4phase transition is γ-Fe
2o
3latent heat (the 451kJ/kg Fe that thing phase time discharges
3o
4).The hot blast going out grate-cooler or single cylinder cooling machine enters magnetizing roast equipment as fuel combustion combustion air through sirocco reclamation airduct, can significantly reduce roasting hear rate.Relative to existing magnetic roasting process, the present invention can make unit roasted ore hear rate reduce by 100 ~ 110kcal/kg roasted ore, wherein roasted ore sensible heat 65 ~ 75kcal/kg roasted ore, roasted ore phase transition latent heat 35kcal/kg roasted ore.The present invention can effectively reduce roasting hear rate, and then reduces beneficiation cost, and can improve work on the spot environment, has the feature of energy-conserving and environment-protective, can be widely used in the magnetization roasting apparatus such as shaft furnace, rotary kiln, fluidized bed furnace, flash roaster.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the first equipment realizing iron ore magnetizing roast ore deposit of the present invention waste heat reclaiming process;
Fig. 2 is the schematic diagram of the second equipment realizing iron ore magnetizing roast ore deposit of the present invention waste heat reclaiming process.
In figure: band arrow dotted line is airflow direction, band arrow solid line is stream direction, and 1 is grate-cooler, 2 be that to be with the single cylinder cooling machine, 3 of built-in water injector to be water pipeline, 4 are air draft pipes, 5 are dust-precipitators, 6 are blower fans, 7 are sirocco reclamation airducts, 8 are water injection systems, 9 are steam treatment systems, 10 is magnetizing roast equipment, 10-1 is shaft furnace, 10-2 be rotary kiln, 11 are single cylinder cooling machines, 12 is magnetizing roast equipment, 12-1 is fluidized bed furnace, 12-2 is flash roaster.
Detailed description of the invention
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
See Fig. 1 and Fig. 2, a kind of iron ore magnetizing roast ore deposit waste heat reclaiming process, comprises the following steps:
One) adopt the single cylinder cooling machine 2 of band built-in water injector that high temperature iron ore magnetizing roast ore deposit water spray is chilled to 450 ~ 500 DEG C;
Two) adopt grate-cooler 1 or single cylinder cooling machine 11 by air-cooled to less than 100 DEG C for the iron ore magnetizing roast ore deposit being chilled to 450 ~ 500 DEG C, the hot blast going out grate-cooler 1 or single cylinder cooling machine 11 is introduced magnetizing roast equipment 10 or 12, as the combustion air of fuel combustion simultaneously.
See Fig. 1, realize the first equipment of above-mentioned iron ore magnetizing roast ore deposit waste heat reclaiming process, comprise and be with the single cylinder cooling machine 2 of built-in water injector and the grate-cooler 1 of series connection with it, the charging aperture of the single cylinder cooling machine 2 with built-in water injector is connected with the discharge port of magnetizing roast equipment 10, and discharging opening is connected with the charging aperture of grate-cooler 1; Grate-cooler 1 is provided with hot-blast outlet, and the hot-blast outlet of grate-cooler 1 is connected with magnetizing roast equipment 10 by sirocco reclamation airduct 7; Single cylinder cooling machine 2 inside with built-in water injector arranges water pipeline 3 and air draft pipe 4, and water pipeline 3 is connected with water injection system 8, and air draft pipe 4 is connected with steam treatment system 9.Grate-cooler 1 can be third generation grate-cooler or forth generation grate-cooler, also can be the grate-cooler of other type; Above-mentioned water pipeline is provided with injection flow rate adjusting device, to make injection flow rate controlled.Above-mentioned magnetizing roast equipment 10 can be shaft furnace 10-1 or rotary kiln 10-2.
See Fig. 2, realize the second equipment of above-mentioned iron ore magnetizing roast ore deposit waste heat reclaiming process, comprise and be with the single cylinder cooling machine 2 of built-in water injector and the single cylinder cooling machine 11 of series connection with it, the charging aperture of the single cylinder cooling machine 2 with built-in water injector is connected with the discharge port of magnetizing roast equipment 12, and discharging opening is connected with the charging aperture of single cylinder cooling machine 11; Single cylinder cooling machine 11 is provided with hot-blast outlet, and the hot-blast outlet of single cylinder cooling machine 11 is connected with magnetizing roast equipment 12 by sirocco reclamation airduct 7; Single cylinder cooling machine 2 inside with built-in water injector arranges water pipeline 3 and air draft pipe 4, and water pipeline 3 is connected with water injection system 8, and air draft pipe 4 is connected with steam treatment system 9.Single cylinder cooling machine 11 adopts the lifting blade version optimized.Above-mentioned water pipeline is provided with injection flow rate adjusting device, to make injection flow rate controlled.Above-mentioned magnetizing roast equipment 12 can be fluidized bed furnace 12-1 or flash roaster 12-2.
The Main Function of the single cylinder cooling machine 2 of the built-in water injector of above-mentioned band is to go out the high-temperature roasting ore deposit water spray starvation chilling of magnetizing roast equipment, by regulating the single cylinder cooling machine outlet roasted ore temperature of the built-in water injector of injection flow rate control cincture at 450 ~ 500 DEG C, the water spray position of water pipeline 3 is positioned at the feed end of the single cylinder cooling machine 2 being with built-in water injector, injection flow rate can according to the single cylinder cooling machine delivery end roasted ore temperature automatic adjustment of the built-in water injector of band, the feed end of the single cylinder cooling machine 2 of the built-in water injector of band is provided with air draft pipe 4, the steam that water spray produces is taken away, steam is avoided to enter magnetizing roast device interior, affect the normal operation of magnetizing roast system, water pipeline 3 and air draft pipe 4 to reach a high temperature magnetizing roast ore deposit charging aperture through the single cylinder cooling machine 2 of the built-in water injector of band, in time chilling is carried out to the high-temperature roasting ore deposit going out magnetizing roast equipment, the steam simultaneously produced also is taken away in time.
The discharging opening of the single cylinder cooling machine 2 of the built-in water injector of charging aperture connecting band of grate-cooler 1 or single cylinder cooling machine 11, the Main Function of grate-cooler 1 or single cylinder cooling machine 11 is waste heat recovery, and magnetizing roast ore deposit is cooled to less than 100 DEG C.Waste heat source has two, and one is the sensible heat of single cylinder cooling machine outlet 450 ~ 500 DEG C of roasted ores being with built-in water injector; It two is magnetic iron ore Fe
3o
4carry out aerobic cooling at low temperatures, generate ferromagnetic gamma-Fe
2o
3time latent heat (the 451kJ/kg Fe that discharges
3o
4).Grate-cooler 1 or single cylinder cooling machine 11 connect sirocco reclamation airduct 7, sirocco reclamation airduct 7 is provided with dust-precipitator 5 and blower fan 6, draw wind by blower fan 6, the hot blast going out grate-cooler 1 or single cylinder cooling machine 11 is introduced in magnetizing roast equipment 10 or 12, as the combustion air of fuel combustion.The effect of dust-precipitator 5 is that the hot blast grate-cooler 1 or single cylinder cooling machine 11 is carried out separation dedusting, dust-precipitator 5 is provided with blanking airlock, and dust-precipitator 5 pattern can be the dust-precipitator of expansion chamber, rotoclone collector, cottrell, bag filter or other type.Sirocco reclamation airduct 7 is provided with valve, regulates the air quantity entered in magnetizing roast equipment 10 or 12.Water injection system 8 comprises water pump, nozzle, spray gun and control system.Steam treatment system 9 comprises steam exhaust column, cottrell and exhaust blower.Above-mentioned magnetizing roast equipment includes but not limited to shaft furnace, rotary kiln, fluidized bed furnace and flash roaster.
Operation principle of the present invention and key problem in technology are:
1) high temperature magnetization roasted ore two-step cooling: the high temperature magnetization roasted ore going out magnetizing roast equipment 10 or 12 enters the single cylinder cooling machine 2 being with built-in water injector, exports roasted ore temperature at 450 ~ 500 DEG C by regulating the single cylinder cooling machine 2 of the built-in water injector of injection flow rate control cincture.The spill firebrick that the feed end inner surface of the single cylinder cooling machine with built-in water injector is not waited by thickness is formed, to extend the time of staying of magnetizing roast ore deposit in water spray quench zone.Water spray position is positioned at the front end of the single cylinder cooling machine being with built-in water injector, and injection flow rate can according to the single cylinder cooling machine delivery end roasted ore temperature automatic adjustment of the built-in water injector of band.Single cylinder cooling machine 2 inside with built-in water injector arranges water pipeline 3 and air draft pipe 4, water is introduced in water pipeline 3 by water injection system 8, the water of ejection contacts with the magnetizing roast ore deposit entering the single cylinder cooling machine being with built-in water injector, roasted ore temperature reduces rapidly under the condition of starvation, become steam after water heat absorption, be drawn to steam treatment system 9 by air draft pipe 4.High temperature magnetization roasted ore is chilled to certain control temperature through water spray, realizes the anaerobic cooling under high temperature, to ensure magnetic concentrate grade and the rate of recovery.The roasted ore of the single cylinder cooling machine 2 gone out with built-in water injector is cooled to and is less than 100 DEG C by grate-cooler 1 or single cylinder cooling machine 11 further.
2) heat recovery: the hot blast going out grate-cooler 1 or single cylinder cooling machine 11 blower fan 6 draw wind under, after dust-precipitator 5 gathers dust, enter in sirocco reclamation airduct 7, sirocco reclamation airduct 7 is connected with magnetizing roast equipment 10 or 12, as the combustion air of magnetizing roast equipment 10 or 12, air force is controlled by the valve be arranged on sirocco reclamation airduct 7.Waste heat source has two, and one is the sensible heat of single cylinder cooling machine outlet 450 ~ 500 DEG C of roasted ores being with built-in water injector; It two is magnetic iron ore Fe
3o
4carry out aerobic cooling at low temperatures, generate ferromagnetic gamma-Fe
2o
3time latent heat (the 451kJ/kg Fe that discharges
3o
4).Unit roasted ore is 100 ~ 110kcal/kg roasted ore by the heat of sirocco reclamation, wherein roasted ore sensible heat 65 ~ 75kcal/kg roasted ore, and roasted ore phase transition latent heat 35kcal/kg roasted ore, energy-saving effect is obvious.
The present invention has the function of the anaerobic cooling of high temperature magnetization roasted ore and waste heat recovery concurrently, while guarantee magnetic concentrate grade and the rate of recovery and cooling, achieve heat recovery, solve the technical barrier that existing high temperature magnetization roasted ore process for cooling is difficult to effectively reclaim roasted ore heat, and work on the spot environment can be improved.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above, protection scope of the present invention is not limited in above-mentioned detailed description of the invention, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (9)
1. an iron ore magnetizing roast ore deposit waste heat reclaiming process, is characterized in that, adopts following steps:
One) adopt the single cylinder cooling machine of band built-in water injector that high temperature iron ore magnetizing roast ore deposit water spray is chilled to 450 ~ 500 DEG C;
Two) adopt grate-cooler or single cylinder cooling machine by air-cooled to less than 100 DEG C for the iron ore magnetizing roast ore deposit being chilled to 450 ~ 500 DEG C, the hot blast going out grate-cooler or single cylinder cooling machine is introduced roasting apparatus, as the combustion air of fuel combustion simultaneously.
2. one kind realizes the equipment of iron ore magnetizing roast ore deposit waste heat reclaiming process as claimed in claim 1, it is characterized in that, comprise and be with the single cylinder cooling machine of built-in water injector and the grate-cooler of series connection with it or single cylinder cooling machine, the charging aperture of the single cylinder cooling machine of the built-in water injector of described band is connected with magnetizing roast equipment discharge port, and discharging opening is connected with the charging aperture of described grate-cooler or described single cylinder cooling machine; Described grate-cooler or described single cylinder cooling machine are provided with hot-blast outlet, and the hot-blast outlet of described grate-cooler or described single cylinder cooling machine is by sirocco reclamation airduct and described magnetizing roast equipment connection; The single cylinder cooling machine inside of the built-in water injector of described band arranges water pipeline and air draft pipe, and described water pipeline is connected with water injection system, and described air draft pipe is connected with steam treatment system.
3. iron ore magnetizing roast ore deposit according to claim 2 waste heat recovery apparatus, is characterized in that, the spill firebrick that the feed end inner surface of the single cylinder cooling machine of the built-in water injector of described band is not waited by thickness is formed.
4. the iron ore magnetizing roast ore deposit waste heat recovery apparatus according to Claims 2 or 3, is characterized in that, the water exit position of described water pipeline is arranged on the feed end of the single cylinder cooling machine of the built-in water injector of described band.
5. iron ore magnetizing roast ore deposit according to claim 2 waste heat recovery apparatus, it is characterized in that, described sirocco reclamation pipe is provided with dust-precipitator.
6. the iron ore magnetizing roast ore deposit waste heat recovery apparatus according to claim 2 or 5, it is characterized in that, described sirocco reclamation pipe is provided with blower fan.
7. iron ore magnetizing roast ore deposit according to claim 2 waste heat recovery apparatus, it is characterized in that, described sirocco reclamation pipe is provided with valve.
8. iron ore magnetizing roast ore deposit according to claim 2 waste heat recovery apparatus, is characterized in that, described magnetizing roast equipment is any one in shaft furnace, rotary kiln, fluidized bed furnace and flash roaster.
9. the iron ore magnetizing roast ore deposit waste heat recovery apparatus according to claim 2 or 4, it is characterized in that, described water pipeline is provided with injection flow rate adjusting device.
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| CN201410566257.3A CN104329945B (en) | 2014-10-22 | 2014-10-22 | A kind of iron ore magnetizing roast ore deposit waste heat reclaiming process and equipment |
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| CN201410566257.3A CN104329945B (en) | 2014-10-22 | 2014-10-22 | A kind of iron ore magnetizing roast ore deposit waste heat reclaiming process and equipment |
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| CN104329945B CN104329945B (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106854684A (en) * | 2016-12-27 | 2017-06-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | One kind is used for iron ore magnetizing roast tunnel cave and iron ore magnetizing roast method |
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| CN106854684A (en) * | 2016-12-27 | 2017-06-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | One kind is used for iron ore magnetizing roast tunnel cave and iron ore magnetizing roast method |
| CN106854684B (en) * | 2016-12-27 | 2018-11-23 | 甘肃酒钢集团宏兴钢铁股份有限公司 | One kind being used for iron ore magnetizing roast tunnel oven and iron ore magnetizing roast method |
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| CN104329945B (en) | 2016-08-17 |
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