CN109706313A - A method of improving microwave preheating sintered mixture moisture and is lost - Google Patents
A method of improving microwave preheating sintered mixture moisture and is lost Download PDFInfo
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- CN109706313A CN109706313A CN201910023655.3A CN201910023655A CN109706313A CN 109706313 A CN109706313 A CN 109706313A CN 201910023655 A CN201910023655 A CN 201910023655A CN 109706313 A CN109706313 A CN 109706313A
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Abstract
A method of improving microwave preheating sintered mixture moisture and be lost, using the difference of magnetic iron ore in sinter mixture and bloodstone absorbing microwave capability, control the moisture of mixture, effectively solves the problems, such as mixture water loss in microwave heating process.Compared with prior art, the beneficial effects of the present invention are: the present invention is using magnetic iron ore, bloodstone and flux in sinter mixture to the difference of Microwave Absorption Properties, under conditions of not changing conventional sintering mixture process, by changing charging sequence, magnetic iron ore is set to be in core, bloodstone is in outer layer, and the preheating temperature of sinter mixture is made to be increased to 68 DEG C -74 DEG C by 58 DEG C -64 DEG C, and mixture moisture, which is lost, is reduced to 20% by original 50%.On the one hand solve the problems, such as that the fast loss of moist of magnetic iron ore heating speed is more, it is slow in addition to also solve conventional sintering mixed material heating speed, heats non-uniform problem.
Description
Technical field
The invention belongs to microwave heating technique fields more particularly to a kind of improvement microwave preheating sintered mixture moisture to be lost
Method.
Background technique
Currently, the heating of sinter mixture is all made of steam preheating mode or bustle pipe mode or two mixed steam preheatings, or
Heat pipe mode, but the technology is bad to the pre-heat effect of sinter mixture, mainly heating are uneven, close to heat pipe section temperature compared with
Height, whole heating temperature is inadequate, and generally 58-64 DEG C or so, and also this temperature is lower in winter, and microwave preheating sintering is mixed
Material is closed exactly to propose in this context.
Microwave preheating has the characteristics that globality, heating speed are fast, thus metallurgy, material, in terms of obtain
It is widely applied.The patent document of Publication No. CN201510678717.6 discloses a kind of " sludge microwave drying treatment method ",
First using heat treatment, microwave treatment then being used again, can significantly reduce moisture percentage in sewage sludge, also having Treatment of Sludge, low energy consumption
The advantages of, to effectively facilitate recycling sludge.
" a kind of device for producing sponge iron " disclosed in the patent document of Publication No. CN201610696228.8, using microwave
It preheats iron charge and produces sponge iron.The experimental study of microwave heating carbonaceous pelletizing has been carried out there are also some metallurgists, and has been achieved
Good effect.Microwave preheating sinter mixture also results in the concern of people in field of metallurgy, but laboratory result shows
During microwave preheating sinter mixture, because of heating temperature height, moisture has the problem of evaporation, and water has heat transfer in sintering, glues
The effect of agent is tied, indispensable, therefore, during microwave preheating mixture, how controlling and improving water loss is one
Very crucial problem.
Microwave preheating sinter mixture is also in laboratory stage.In an experiment, by taking thousand concentrate of saddle as an example, after preheating 10s,
Sintered mixture moisture loses 33%, and after preheating 20s, sintered mixture moisture loses 54%.Therefore, how to improve microwave heating
The loss of moist of sinter mixture or control problem are very crucial in the process.It is corresponding with this magnetite concentrate of saddle thousand to be, it is red
Although iron ore temperature heating in microwave heating process is fast, moisture loss is less, by taking Newman fine ore as an example, after preheating 10s, and sintering
Mixture moisture loses 9.48%, and after preheating 20s, sintered mixture moisture loses 23.1%.
Summary of the invention
The purpose of the present invention is a kind of methods that improvement microwave preheating sintered mixture moisture is lost, and utilize sinter mixture
The difference of middle magnetic iron ore and bloodstone absorbing microwave capability controls the moisture of mixture, effectively solves mixture in microwave heating
In the process the problem of water loss.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A method of improving microwave preheating sintered mixture moisture and be lost, the specific method is as follows:
1) when blending-field not being used to mix only with belt to sinter mixture:
Magnetite concentrate is added by front feed bin I and front feed bin II in advance, and bloodstone, flux and fuel later period are by feed bin III
Mixture is added with feed bin IV, at this point, whole materials are stacked in stratiform on belt, top is the bloodstone for being not easy to absorb microwave
With flux and fuel, lower part is the magnet mineral material for easily absorbing microwave；
Then the material on belt is heated by microwave heating system, last entire mixture material enters mixing agitator simultaneously
Feed bin is given for being sintered；
2) in the case where there is blending-field:
Sinter mixture is divided into two parts, a part is mixed by magnetic iron ore, bloodstone, flux and fuel, and Zhan is total
The 85%-95% of material, this partially sinters mixture and mixes via blending-field and be sent to sintering via belt；Another part is
Bloodstone or flux, the 5%-15% of the total material of Zhan, this part do not participate in the mixing of blending-field, are added and are burnt by the belt later period
It ties in mixture；
Belt is added by front feed bin I and front feed bin II in mixture after mixing via blending-field；
Belt is added by feed bin III and feed bin IV without the bloodstone or flux later period of blending-field mixing, at this point, skin
It takes whole materials to stack in stratiform, top is the bloodstone or flux material for being not easy to absorb microwave, and lower part is easily to absorb microwave
Mixture, then the material on belt is heated by microwave heating system, last entire mixture material enters mixing agitator
And feed bin is given for being sintered.
The flux is that magnesite, lime stone and quick lime are one such or several.
The fuel is coke powder or coal dust or both mixture.
It is not easy to absorb the thickness of feed layer of microwave not less than 10mm.
Compared with prior art, the beneficial effects of the present invention are:
The present invention, to the difference of Microwave Absorption Properties, is not being changed using magnetic iron ore, bloodstone and flux in sinter mixture
Become under conditions of conventional sintering mixture process, by changing charging sequence, so that magnetic iron ore is in core, bloodstone is in outer
Layer makes the preheating temperature of sinter mixture be increased to 68 DEG C -74 DEG C by 58 DEG C -64 DEG C, and mixture moisture is lost by original
50% is reduced to 20%.On the one hand it solves the problems, such as that the fast loss of moist of magnetic iron ore heating speed is more, in addition also solves traditional burning
It is slow to tie mixed material heating speed, heats non-uniform problem.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
In figure: the front 1- feed bin I, the front 2- feed bin II, 3- feed bin III, 4- feed bin IV, 5- belt, 6- microwave heating system
System, 7- mixing agitator, 8- feed bin.
Specific embodiment
Below with reference to embodiment, specific embodiments of the present invention will be further explained:
See Fig. 1, a method of improving microwave preheating sintered mixture moisture and be lost, the specific method is as follows:
1) when blending-field not being used to mix only with belt to sinter mixture:
Magnetite concentrate is added by front feed bin I and front feed bin II in advance, and bloodstone, flux and fuel later period are by feed bin III
Mixture is added with feed bin IV, at this point, whole materials are stacked in stratiform on belt, top is the bloodstone for being not easy to absorb microwave
With flux and fuel, lower part is the magnet mineral material for easily absorbing microwave；
Then the material on belt is heated by microwave heating system, last entire mixture material enters mixing agitator simultaneously
Feed bin is given for being sintered；
2) in the case where there is blending-field:
Sinter mixture is divided into two parts, a part is mixed by magnetic iron ore, bloodstone, flux and fuel, and Zhan is total
The 85%-95% of material, this partially sinters mixture and mixes via blending-field and be sent to sintering via belt；Another part is
Bloodstone or flux, the 5%-15% of the total material of Zhan, this part do not participate in the mixing of blending-field, are added and are burnt by the belt later period
It ties in mixture；
Belt is added by front feed bin I and front feed bin II in mixture after mixing via blending-field；
Belt is added by feed bin III and feed bin IV without the bloodstone or flux later period of blending-field mixing, at this point, skin
It takes whole materials to stack in stratiform, top is the bloodstone or flux material for being not easy to absorb microwave, and lower part is easily to absorb microwave
Mixture, then the material on belt is heated by microwave heating system, last entire mixture material enters mixing agitator
And feed bin is given for being sintered.
The flux is that magnesite, lime stone and quick lime are one such or several.
The fuel is coke powder or coal dust or both mixture.
It is not easy to absorb the thickness of feed layer of microwave not less than 10mm.
The embodiment of the present invention has carried out the microwave preheating of sinter mixture using live ore matching as standard, wherein raising enlightening, height
Brazil, Newman are bloodstone, bend magnetic and thousand concentrate of saddle is magnetite concentrate, magnesite, lime stone, quick lime are flux, and coke powder is solid
Fluid fuel.Raw material chemical analysis is shown in Table 1.
The following method measurement of the measurement of stratiform mixture moisture: each single mine is mixed into sintering according to sintered material ratio
Then mixture measures mixture moisture using moisture teller.
Stratiform mixture temperature measures as follows: after layered sintered mixture microwave heating, by mercurial thermometer
At the 2/3 of bed of material overall thickness, mixture temperature at this is obtained, and using it as mixture temperature.
1 material chemical component of table (wt%)
Comparative example: magnetic concentrate 16.48kg, Yang Di 8.16kg, Gao Baxi 6.12kg, Newman 6.38kg, flux mixing will be bent
(lime stone 4kg, magnesite 1.28kg, quick lime 2.8kg, coke powder 1.9kg) after conventional hybrid mode all mixing by passing through by skin
Band is sent to sintering, and raw material moisture 7.2wt% before preheating carries out microwave preheating, preheating time 40s, preheating on 40kw micro-wave oven
Raw material moisture 4.1wt% afterwards, 62 DEG C of mixture temperature after preheating.
Embodiment 1: magnetic concentrate 16.48kg, Yang Di 8.16kg, Gao Baxi 6.12kg, Newman 6.38kg, flux mixing will be bent
(lime stone 4kg, magnesite 1.28kg, quick lime 2.8kg, coke powder 1.9kg) is successively laid on belt, raw material moisture before preheating
7.2wt%, carries out microwave preheating on 40kw micro-wave oven, and preheating time 40s, raw material moisture 6.8wt% after preheating are mixed after preheating
Close 76 DEG C of material temperature degree.
Embodiment 2: magnetic concentrate 16.48kg, Yang Di 8.16kg, Gao Baxi 6.12kg, Newman 6.38kg, flux mixing will be bent
(lime stone 4kg, magnesite 1.28kg, quick lime 2.8kg, coke powder 1.9kg) is successively laid on belt, raw material moisture before preheating
7.2wt%, carries out microwave preheating on 40kw micro-wave oven, and preheating time 20s, raw material moisture 7.0wt% after preheating are mixed after preheating
Close 74 DEG C of material temperature degree.
Embodiment 3: magnetic concentrate 16.48kg, Yang Di 8.16kg, Gao Baxi 6.12kg, Newman 6.38kg, flux mixing will be bent
(lime stone 4kg, magnesite 1.28kg, quick lime 2.8kg, coke powder 1.9kg) is successively laid on belt, raw material moisture before preheating
8.0wt%, carries out microwave preheating on 40kw micro-wave oven, and preheating time 40s, raw material moisture 7.4wt% after preheating are mixed after preheating
Close 86 DEG C of material temperature degree.
Embodiment 4: magnetic concentrate 16.48kg, Yang Di 8.16kg, Gao Baxi 6.12kg, Newman 6.38kg, flux mixing will be bent
(lime stone 4kg, magnesite 1.28kg, quick lime 2.8kg, coke powder 1.9kg) is successively laid on belt, raw material moisture before preheating
8.5wt%, carries out microwave preheating on 40kw micro-wave oven, and preheating time 40s, raw material moisture 8.1wt% after preheating are mixed after preheating
Close 94 DEG C of material temperature degree.
Embodiment 5: magnetic concentrate 17kg, Yang Di 20kg, flux mixing (lime stone 4kg, magnesite 1.28kg, quick lime will be bent
2.8kg, coke powder 1.9kg) successively it is laid on belt, it is pre- to carry out microwave on 40kw micro-wave oven by raw material moisture 7.5wt% before preheating
Heat, preheating time 40s, raw material moisture 7.2wt% after preheating, 83.4 DEG C of mixture temperature after preheating.
Embodiment 6: by thousand concentrate 25kg of saddle, Yang Di 14kg, flux mixing (lime stone 4kg, magnesite 1.28kg, quick lime
2.8kg, coke powder 1.9kg) successively it is laid on belt, it is pre- to carry out microwave on 40kw micro-wave oven by raw material moisture 7.5wt% before preheating
Heat, preheating time 40s, raw material moisture 7.0wt% after preheating, 93.8 DEG C of mixture temperature after preheating.
Embodiment 7: by thousand concentrate 10kg of saddle, Yang Di 26kg, flux mixing (lime stone 4kg, magnesite 1.28kg, quick lime
2.8kg, coke powder 1.9kg) successively it is laid on belt, it is pre- to carry out microwave on 40kw micro-wave oven by raw material moisture 7.5wt% before preheating
Heat, preheating time 60s, raw material moisture 7.3wt% after preheating, 68.4 DEG C of mixture temperature after preheating.
The data result of above-described embodiment is shown in Table 2；
Table 2: embodiment conclusive table
Comparative example is not prevent water loss and the biggish case of bring water loss using bedding method or covering method, this
When, the preheating temperature of sinter mixture is not high, and compared to embodiment 1- embodiment 7, comparative example water loss is more, heat loss
Few, high-temperature region is deteriorated in outer surface, microwave traditional capability, and preheating temperature is lower, meanwhile, moisture is reduced to 4.1% by 7.2%,
Scatter and disappear 3.1%, close to the 50% of original moisture, and after taking the method for the invention, the problem of this 2 aspect obtains certain
Solution or alleviation, preheating temperature gets a promotion, and moisture loss also tails off.
From the foregoing, it will be observed that by carrying out layer-by-layer distribution with the bloodstone for being not easy to absorb microwave to the easy magnetic iron ore for absorbing microwave,
The temperature of sinter mixture is increased to dew-point temperature or more, meanwhile, also avoid mixture water caused by the unified heating of tradition
The problem of dividing evaporation, so that it is increased to 7.0wt% or so from original 4.1wt%, it is made to be improved and be controlled, meet burning
The requirement of peering mixture water, conducting heat and breathing freely for sintering lays the foundation.
Claims (4)
1. a kind of method for improving microwave preheating sintered mixture moisture and being lost, which is characterized in that the specific method is as follows:
1) when blending-field not being used to mix only with belt to sinter mixture:
Magnetite concentrate is added by front feed bin I and front feed bin II in advance, and bloodstone, flux and fuel later period are by feed bin III and material
Mixture is added in storehouse IV, at this point, whole materials are stacked in stratiform on belt, top is to be not easy to absorb the bloodstone of microwave and melt
Agent and fuel, lower part are the magnet mineral material for easily absorbing microwave；
Then the material on belt is heated by microwave heating system, last entire mixture material enters mixing agitator and gives
Feed bin is for being sintered；
2) in the case where there is blending-field:
Sinter mixture is divided into two parts, a part is mixed by magnetic iron ore, bloodstone, flux and fuel, the total material of Zhan
85%-95%, this partially sinter mixture via blending-field mix and be sent to sintering via belt；Another part is red iron
Mine or flux, the 5%-15% of the total material of Zhan, this part do not participate in the mixing of blending-field, and it is mixed that sintering is added by the belt later period
It closes in material；
Belt is added by front feed bin I and front feed bin II in mixture after mixing via blending-field；
Belt is added by feed bin III and feed bin IV without the bloodstone or flux later period of blending-field mixing, at this point, on belt
Whole materials are stacked in stratiform, and top is the bloodstone or flux material for being not easy to absorb microwave, and lower part is easily to absorb mixing for microwave
Material is closed, then the material on belt is heated by microwave heating system, last entire mixture material enters mixing agitator and send
To feed bin for being sintered.
2. a kind of method for improving microwave preheating sintered mixture moisture and being lost according to claim 1, which is characterized in that
The flux is that magnesite, lime stone and quick lime are one such or several.
3. a kind of method for improving microwave preheating sintered mixture moisture and being lost according to claim 1, which is characterized in that
The fuel is coke powder or coal dust or both mixture.
4. a kind of method for improving microwave preheating sintered mixture moisture and being lost according to claim 1, which is characterized in that
It is not easy to absorb the thickness of feed layer of microwave not less than 10mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111530591A (en) * | 2020-05-09 | 2020-08-14 | 东北大学 | Gravity type double-pipe microwave grinding-aid device capable of controlling ore thickness and using method |
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| JPH06212293A (en) * | 1993-01-12 | 1994-08-02 | Nippon Steel Corp | Manufacture of sintered ore |
| JPH08295951A (en) * | 1995-04-24 | 1996-11-12 | Nippon Steel Corp | Pretreatment of material to be sintered |
| CN1724695A (en) * | 2005-05-10 | 2006-01-25 | 太原理工大学 | Method of manufacturing low carbon sponge iron using microwave vertical furnace |
| CN102794455A (en) * | 2012-09-05 | 2012-11-28 | 昆明理工大学 | Method for preparing primary reduction iron powder by combining inner and outer carbon matching and microwave heating |
| CN106191426A (en) * | 2016-07-26 | 2016-12-07 | 宣化钢铁集团有限责任公司 | A kind of sinter mixture automatic watering Apparatus and method for |
| CN206069957U (en) * | 2016-08-31 | 2017-04-05 | 鞍钢股份有限公司 | A kind of device of preheating sinter mixture |
-
2019
- 2019-01-10 CN CN201910023655.3A patent/CN109706313B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06212293A (en) * | 1993-01-12 | 1994-08-02 | Nippon Steel Corp | Manufacture of sintered ore |
| JPH08295951A (en) * | 1995-04-24 | 1996-11-12 | Nippon Steel Corp | Pretreatment of material to be sintered |
| CN1724695A (en) * | 2005-05-10 | 2006-01-25 | 太原理工大学 | Method of manufacturing low carbon sponge iron using microwave vertical furnace |
| CN102794455A (en) * | 2012-09-05 | 2012-11-28 | 昆明理工大学 | Method for preparing primary reduction iron powder by combining inner and outer carbon matching and microwave heating |
| CN106191426A (en) * | 2016-07-26 | 2016-12-07 | 宣化钢铁集团有限责任公司 | A kind of sinter mixture automatic watering Apparatus and method for |
| CN206069957U (en) * | 2016-08-31 | 2017-04-05 | 鞍钢股份有限公司 | A kind of device of preheating sinter mixture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111530591A (en) * | 2020-05-09 | 2020-08-14 | 东北大学 | Gravity type double-pipe microwave grinding-aid device capable of controlling ore thickness and using method |
| CN111530591B (en) * | 2020-05-09 | 2021-05-25 | 东北大学 | Gravity type double-pipe microwave grinding-aid device capable of controlling ore thickness and using method |
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