CN85104327A - The sclerosis roasting method in the iron ore pellet ore deposit of portable grate - Google Patents
The sclerosis roasting method in the iron ore pellet ore deposit of portable grate Download PDFInfo
- Publication number
- CN85104327A CN85104327A CN85104327.5A CN85104327A CN85104327A CN 85104327 A CN85104327 A CN 85104327A CN 85104327 A CN85104327 A CN 85104327A CN 85104327 A CN85104327 A CN 85104327A
- Authority
- CN
- China
- Prior art keywords
- pellet
- ore
- millibar
- hot gas
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
Abstract
In order to reduce the oxidizing roasting energy expenditure of operating period, in pellet, mix a certain amount of carbonaceous solid particulates, make fixed carbon content in this pellet, surpassing by the stoichiometric calculation reducing hematite is the required quantity of fusing assistant of required quantity of magnetite and decomposition and consumption heat energy, perhaps surpasses the required quantity of fusing assistant of decomposition and consumption heat energy.In the roast area of portable fire grate, hot gas passes through the pelletizing mining area with the pressure that is lower than normal atmosphere 5-20 millibar.
Description
The invention relates under oxidizing condition, with handling by the hot gas of pellet charging, the method in sclerosis roasting iron ore pellet ore deposit on portable fire grate, in this method, the required part heat of sclerosis roasting is provided by added carbonaceous solid particulates in this pellet.
The iron ore pellet ore deposit under about 1200 to 1350 ℃ of temperature, the roasting of on the fire grate that the orthoscopic that gas hood is housed moves or Clothoid type moves, hardening.Said portable fire grate also is called the pellet-roasting machine, and it includes several treatment zones, is arranged in order on the direction that moves, and these are handled and distinguish drying zone, roast area and cooling zone.Said these treatment zones can further segment, and for example are subdivided into predrying district and after drying district, heating zone, preroasting district, main roast area and back roast area, and first cooling zone and second cooling zone.
At contained iron in the pellet of peroxidation sclerosis roasting, major part is under the highest oxidation state, promptly is in F
E2O
3Under the form.When sclerosis roasting magnetite pellet or contain magnetite (F
E3O
4) pellet the time, required heat when the heat of desiring to be provided by hot gas is lower than sclerosis material roasting hematite pellets ore deposit is because F
E3O
4Be oxidized to F
E2O
3Process be heat release.The per unit area through-put rate of pellet-roasting machine depends primarily on the magnetite content of desiring in the milling of ores, and along with said magnetite content increases and increases.Just because of this, many tests have been done for the through-put rate that improves when handling rhombohedral iron ore.For this reason, in pellet, added abundant levigated carbonaceous solid particulates.Thereby cause the per unit area through-put rate to occur significantly increasing, if but fixed carbon (C
Fix) content was above about 1.3% o'clock, the ultimate compression strength of pellet sharply reduces, and if C
FixThe content height, then the through-put rate of per unit area also reduces.Be no more than said C
FixDuring content, through-put rate increases, and the pellet quality that obtains is good, and deflation rate and temperature all reduce (" processing technology " " Aufbereitungs Technik ", the 12nd phase,, 783-788 page or leaf in 1973).When burning content was approximately 1.3% fixed carbon, the heat of generation approximated F greatly
E3O
4Be oxidized to F
E2O
3The time heat that produces.The C of this numerical value
FixContent approximately is enough to F
E2O
3Be reduced to F
E3O
4In the magnetite pellet, mix carbonaceous solid particulates, cause pellet strength significantly to reduce.
The objective of the invention is has under the condition of high material through-rate and production high quality pellet at the pellet-roasting facility, further reduces energy expenditure.
Finishing the goal of the invention approach according to the present invention is: mix carbonaceous solid particulates in pellet, its C
FixIt is required quantity of magnetite and the required quantity of fusing assistant that surpasses decomposition and consumption heat energy that content surpasses by the stoichiometric calculation reducing hematite, perhaps surpasses the required quantity of fusing assistant of decomposition and consumption heat energy; Make hot gas under the pressure that is lower than 5 to 20 millibars in normal atmosphere, the pelletizing ore bed in the roasting zone by being in portable fire grate.This pellet can only be made up of rhombohedral iron ore stone, also can be made up of rhombohedral iron ore stone and magnetic iron ore mixture.Carbonaceous solid particulates can be the coal of hyperergy, also can be the low reactivity coal.Volatile component content in this coal can height can be low.By the fixed carbon C that coal provided
FixCan be up to surpassing by 50% of stoichiometric calculation desired number.This by the required quantity of stoichiometric calculation, always relevant with contained red iron amount quantity in dry ore or the dry ore mixture.
When fusing assistants such as for example basic carbonate mix in the said ore, heat will consume in the decomposition course of said fusing assistant.In this case, C
FixContent can correspondingly increase, and surpassing provides heat required quantity when burning for this purpose.The amount that is added can be up to surpassing 50% of desired number.
Mix the carbonaceous solid particulates in the mixture, do required granularity interpolation to make ball exercise.
Hot gas pressure by roasting zone pellet layer only forces down the 5-20 millibar than atmosphere, and force down about 30-40 millibar than atmosphere in other pellet-roasting process.Used term " sclerosis roasting " (hard-burning) is meant under temperature surpasses about 1250 ℃ of conditions pellet is heat-treated.In the roasting zone, with also corresponding the reducing of gas velocity of suitable cubic meter (under the standard temperature and pressure (STP)) expression of per kilogram furnace charge.Used term " roasting zone " (burning zone) comprises heating zone and roast area itself, be heated to required maturing temperature in the heating zone through the exsiccant pellet, be maintained under the required maturing temperature at the roast area pellet.
Have been found that wonderful result is: adopt lower negative pressure and in pellet, keep higher C in the roasting zone
FixContent, these two combines the physical strength, the pellet that cause keeping pellet has higher vattability ， And and the material handling capacity of pellet-roasting machine is kept, and electric energy and hot gas consumption are minimized.
When adopting the low coal of volatile combustible component content, the fixed carbon content of pellet may be high slightly when using the higher relatively coal of volatile combustible component content.
In each was used, the optimum value of fixed carbon content and negative pressure can be determined by experiment.
The preferred further feature of the present invention is: at air-breathing drying zone, make hot gas pass through the pelletizing ore bed under the pressure that forces down the 5-20 millibar than atmosphere.Drying is generally carried out in two stages, is the pressurization drying zone in the fs, from the lower curtate pressurized, enters top by the pelletizing ore bed at pressurization drying zone hot gas.Second zone is air-breathing drying zone, aspirates on top at air-breathing drying zone hot gas, sucks from the bottom through the pelletizing ore bed.Adopt lower negative pressure and lower gas flow rate at air-breathing drying zone, advantage further increases.
Another preferred characteristics of the present invention are: make hot gas pelletizing ore bed by portable fire grate roast area under the pressure that forces down the 10-15 millibar than atmosphere.Adopt such negative pressure and corresponding gas velocity (the per kilogram furnace charge), will produce particularly advantageous effect.
The feature of present invention further optimization is: the fixed carbon that calculates 1.7-2.0% weight according to dry ore mixes in the hematite pellets ore deposit.Add the amount of fixed carbon according to rhombohedral iron ore cubage in ore or the ore mix.If add the fusing assistant that consumes heat energy in the ore, then this dosage of fluxing can be added in the rhombohedral iron ore content, so that calculate fixed carbon content.Add fixed carbon according to this quadrat method, will produce good result.
Another preferred advantage of the present invention is: calculate according to dry ore, the fixed carbon of 1.8-1.9% weight is mixed in the hematite pellets ore deposit.In this case, when calculating the fixed carbon content that will add, also can consider the consumption heat energy fusing assistant that added, this method adding fixed carbon will produce good especially result.
The present invention will be described in more detail by the mode of reference embodiment.
Adopt a kind of hematite concentrate, calculate according to dry ore, (weight %) is as follows for its analytical results:
Total iron 66.6
F
I e0.9
S
iO
22.6
Al
2O
30.93
C
aO ＜0.05
M
gO ＜0.05
T
iO
20.06
P ＜0.03
Adopted a kind of magnetite concentrate, calculated according to dry ore, (weight %) is as follows for its analytical results:
Total iron 65.6
F
I e18.7
S
iO
21.6
Al
2O
30.93
M
gO 0.58
P 0.04
S 0.20
Used charcoal, calculated according to dried charcoal, (weight %) is as follows for its analytical results:
C
fix54.0
Ash content 18.8
Volatile matter 27.2
Used hard coal, calculated according to dry coal, (weight %) is as follows for its analytical results:
C
fix88.7
Charcoal divides 3.1
Volatile matter 8.2
Used coke, calculated according to dried coke, (weight %) is as follows for its analytical results:
C
fix80.1
Ash content 13.9
Volatile matter 5.3
Pellet is to be approximately in the pot of 26.5Cm in addition roasting at diameter.
Using the hematite pellets ore deposit to do the experimental result that obtains is shown in the table I.Calculate according to dry ore, used the C that contains 2% weight
a(OH)
2C with 2% weight
aCO
3Mixture make pellet.In the table I, listed the solid fuel amount of mixing.The moisture content of wet bulb nodulizing is between 8.8% and 9.75%.First drying stage is the pressurization drying stage, enters top from the bottom via furnace charge at this stage gas pressurized.For air-breathing drying, heating and roasting process, from the top intake-gas, suck from the bottom via furnace charge, the zone of finishing these three steps is called " air-breathing district " (Suction zone).
Use the experimental result of magnetite pellet, list among the table II.
Calculate according to dry ore, usefulness contains the rhombspar of 10% weight and the bentonitic mixture of 0.5% weight has been made pellet.The moisture content of this wet bulb nodulizing is between 9.0% and 9.3%.
The table I
Experiment numbers 1234567
1, fuel mixture--the charcoal coke-
Quantity Wt.%-2.2 2.2 3.4 4.0 2.0 2.3
C
FixContent, Wt.%-1.18 1.18 1.84 2.16 1.8 2.1
2, roasting system
Pressurization is dry
Time, divide 3333333
Temperature, ℃ 275 260 270 250 270 270 265
Pressure, gauge pressure millibar 35 40 40 30 30 30 30
Air-breathing drying
Time, divide 3673233
Temperature, ℃ 350 260 300 250 250 250 250
Negative pressure, millibar 30 30 30 20 5 20 20
Heating
Time, divide 5666666
Temperature, ℃ 350-280-300 250-250-250-250-
1250 1250 1250 1250 1250 1200 1200
Negative pressure, millibar 35 11 10 10 7-10 10 10
Roasting
Time, divide 13 11 16 12 10 12 11
Temperature, ℃ 1,300 1,250 1,250 1,320 1,320 1,300 1300
Negative pressure, millibar 40 30 10-40 10 10 10 10
Cooling
Time, divide 10.3 10 9.3 10.2 10.1 10.2 10.9
Pressure, gauge pressure, millibar 45 40 40 30 30 30 30
Overall treatment time, divide 34.1 36 41.3 34.2 31.1 34.2 33.9
Through-put rate
Metric ton/day, rice
223.8 22.4 19.6 22.0 23.4 23.8 24.0
The table II
Experiment numbers 89 10 11
1, fuel mixture--hard coal-
Quantity, Wt%-0.5 1.0 1.5
C
FixContent, Wt%-0.45 0.9 1.35
2, roasting system
Pressurization is dry
Time, divide 4.5 2.5 3.0 3.0
Temperature, ℃ 260-280 260-280 260-280 260-280
Pressure, gauge pressure, millibar 40 40 30 30
Air-breathing drying
Time, divide 3.5 222
Temperature, ℃ 250-350 250-350 250-350 250-350
Negative pressure, millibar 20 10 20 20
Heating
Time, divide 12 988
Temperature, ℃ 350-1250 350-1250 350-1250 350-1250
Negative pressure, millibar 20-30 10 20-10 20-10
Roasting
Time, divide 10 15.5 15.0 12
Temperature, ℃ 1250-1300 1250-1300 1250-1300 1250-1300
Negative pressure, millibar 50 20 20 15
Cooling
Time, divide 12 10 12 9.5
Pressure, gauge pressure, millibar 40 40 40 40
The total processing
Time, divide 42 39.5 39.0 34.5
Through-put rate
Metric ton/day rice
218.8 19.6 19.2 21.2
Table II (continuing)
Experiment numbers 89 10 11
3, deflation rate
(m
3Standard temperature and pressure/kg)
Pressurization dry 0.7 0.5 0.4 0.5
Air-breathing district 2.3 1.6 1.7 1.6
Cooling zone 2.1 1.9 2.1 2.0
4, energy rate
The vacuum zone
Heat energy imports 3,276 2,483 2,561 2300
Kilojoule/kg
Heat energy exports 992 510 523 423
Kilojoule/kg
The blower fan energy, kilowatt hours/tonne 7.0 3.5 2.5 1.6
Maximum fire bar temperature, ℃ 780 552 552 478
5, the pellet of roasting
Mean compressive strength newton/pellet 2,562 2,337 2,223 1379
ISO abrasion test
+6.3mm，% 96.1 95.1 96.1 96.2
-0.5mm，% 3.3 4.0 3.3 3.6
Reduction act
NTZ tests (500 ℃)
+6.3mm，% 53.1 69.5 54.7 61.8
-0.5mm，% 17.5 10.0 12.1 11.7
Reduce under the load test
(Burghard test)
1050℃ 1.32 1.5 1.34 1.49
DE/dt
40, %/minute
Back-pressure, mm water column 1.8 0.7 0.6 0.5
Reduction, % 80 80 80 80
The invention has the advantages that the heat exhaustion and the energy consumption that have reduced the pellet-roasting machine, have high mechanical properties and high reducibility through the pellet of roasting, and reduced the required capital of complete equipment with given material handling capacity.
Claims (6)
1, under oxidizing condition, handle with hot gas by the pellet furnace charge, the method in sclerosis roasting iron ore pellet ore deposit on portable fire grate, the required part heat of the roasting of wherein hardening is provided by the carbonaceous solid particulates of mixing in this pellet, it is characterized in that: mix the carbonaceous solid particulates in the said pellet, contain fixed carbon, it is required quantity of magnetite and the required quantity of fusing assistant that surpasses decomposition and consumption heat energy that its amount surpasses according to the stoichiometric calculation reducing hematite, the required quantity of fusing assistant that perhaps surpasses decomposition and consumption heat energy, and forcing down than atmosphere under the 5-20 millibar pressure, make hot gas pass through the interior pelletizing ore bed of portable fire grate roast area.
2, in accordance with the method for claim 1, it is characterized in that: under the pressure that forces down the 5-20 millibar than atmosphere, make hot gas pass through pelletizing ore bed in the air-breathing drying zone.
3, in accordance with the method for claim 1, it is characterized in that: forcing down under the pressure of 10-15 millibar than atmosphere, making hot gas pass through the interior pelletizing ore bed of portable fire grate roast area.
4, in accordance with the method for claim 2, it is characterized in that: forcing down under the pressure of 10-15 millibar than atmosphere, making hot gas pass through the interior pelletizing ore bed of portable fire grate roast area.
5, according to any one described method in the claim 1 to 4, it is characterized in that: calculate according to dry ore, the fixed carbon of 1.7-2.0% weight is mixed in the hematite pellets ore deposit.
6, in accordance with the method for claim 5, it is characterized in that: calculate according to dry ore, the fixed carbon of 1.8-1.9% weight is mixed in the magnetite pellet.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843418468 DE3418468A1 (en) | 1984-05-18 | 1984-05-18 | METHOD FOR HARD-BURNING IRON ORE PELLETS ON A WALKING GRATE |
| IN529/CAL/84A IN161245B (en) | 1984-05-18 | 1984-07-25 | |
| JP60093529A JPS60245732A (en) | 1984-05-18 | 1985-04-30 | Method of dead burning iron ore pellet on moving grate |
| DE8585200718T DE3562492D1 (en) | 1984-05-18 | 1985-05-07 | Process for thermo-hardening iron pellets on a moving grate |
| EP85200718A EP0161721B1 (en) | 1984-05-18 | 1985-05-07 | Process for thermo-hardening iron pellets on a moving grate |
| ZA853695A ZA853695B (en) | 1984-05-18 | 1985-05-15 | Process of hard-burning iron ore pellets on a traveling grate |
| BR8502306A BR8502306A (en) | 1984-05-18 | 1985-05-16 | PROCESS FOR USING IRON ORE PELLETS ON A MOBILE GRILL |
| AU42687/85A AU571695B2 (en) | 1984-05-18 | 1985-05-17 | Hard burning of iron ore pellets on a travelling grate |
| CA000481829A CA1258376A (en) | 1984-05-18 | 1985-05-17 | Process of hard-burning iron ore pellets on a traveling grate |
| CN85104327.5A CN1003943B (en) | 1984-05-18 | 1985-06-08 | Process for hard-burning iron ore briquets on a moving grate |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843418468 DE3418468A1 (en) | 1984-05-18 | 1984-05-18 | METHOD FOR HARD-BURNING IRON ORE PELLETS ON A WALKING GRATE |
| CN85104327.5A CN1003943B (en) | 1984-05-18 | 1985-06-08 | Process for hard-burning iron ore briquets on a moving grate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104327A true CN85104327A (en) | 1986-12-03 |
| CN1003943B CN1003943B (en) | 1989-04-19 |
Family
ID=76224751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104327.5A Expired CN1003943B (en) | 1984-05-18 | 1985-06-08 | Process for hard-burning iron ore briquets on a moving grate |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0161721B1 (en) |
| JP (1) | JPS60245732A (en) |
| CN (1) | CN1003943B (en) |
| AU (1) | AU571695B2 (en) |
| BR (1) | BR8502306A (en) |
| CA (1) | CA1258376A (en) |
| DE (2) | DE3418468A1 (en) |
| IN (1) | IN161245B (en) |
| ZA (1) | ZA853695B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102066587A (en) * | 2008-07-16 | 2011-05-18 | 株式会社神户制钢所 | Method for producing iron ore pellets |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3519666A1 (en) * | 1985-06-01 | 1986-12-04 | Metallgesellschaft Ag, 6000 Frankfurt | METHOD FOR HARD-BURNING IRON ORE PELLETS ON A WALKING GRATE |
| IN167132B (en) * | 1986-12-15 | 1990-09-01 | Nippon Kokan Kk |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2696432A (en) * | 1950-12-22 | 1954-12-07 | Univ Minnesota | Method for heating solids |
| US2758919A (en) * | 1952-03-31 | 1956-08-14 | Erie Mining Co | Process of pelletizing |
| DE1242653B (en) * | 1959-07-18 | 1967-06-22 | Metallgesellschaft Ag | Process for the production of pre-reduced iron ore pellets with incorporated carbon |
| FR1490768A (en) * | 1966-08-04 | 1967-08-04 | Midland Ross Corp | Process for hardening grains composed of fine ores |
| AU473854B2 (en) * | 1972-04-04 | 1974-09-26 | Ici Australia Limited | A process forthe benefication of oxide ores |
| US4162284A (en) * | 1975-09-04 | 1979-07-24 | Elkem-Spigerverket A/S | Method of producing mechanically strong pellets from non-oxidizable metal oxides |
| JPS5310313A (en) * | 1976-07-16 | 1978-01-30 | Kobe Steel Ltd | Roasted pellet of iron ore and its preparation |
| JPS56123332A (en) * | 1980-03-01 | 1981-09-28 | Kobe Steel Ltd | Calcining method for iron ore pellet |
| JPS589936A (en) * | 1981-07-10 | 1983-01-20 | Nippon Kokan Kk <Nkk> | Manufacture of agglomerated ore |
-
1984
- 1984-05-18 DE DE19843418468 patent/DE3418468A1/en not_active Withdrawn
- 1984-07-25 IN IN529/CAL/84A patent/IN161245B/en unknown
-
1985
- 1985-04-30 JP JP60093529A patent/JPS60245732A/en active Pending
- 1985-05-07 EP EP85200718A patent/EP0161721B1/en not_active Expired
- 1985-05-07 DE DE8585200718T patent/DE3562492D1/en not_active Expired
- 1985-05-15 ZA ZA853695A patent/ZA853695B/en unknown
- 1985-05-16 BR BR8502306A patent/BR8502306A/en not_active IP Right Cessation
- 1985-05-17 AU AU42687/85A patent/AU571695B2/en not_active Ceased
- 1985-05-17 CA CA000481829A patent/CA1258376A/en not_active Expired
- 1985-06-08 CN CN85104327.5A patent/CN1003943B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102066587A (en) * | 2008-07-16 | 2011-05-18 | 株式会社神户制钢所 | Method for producing iron ore pellets |
| CN102066587B (en) * | 2008-07-16 | 2014-09-03 | 株式会社神户制钢所 | Method for producing iron ore pellets |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
Also Published As
| Publication number | Publication date |
|---|---|
| BR8502306A (en) | 1986-01-21 |
| EP0161721A1 (en) | 1985-11-21 |
| AU4268785A (en) | 1985-11-21 |
| AU571695B2 (en) | 1988-04-21 |
| DE3562492D1 (en) | 1988-06-09 |
| IN161245B (en) | 1987-10-31 |
| ZA853695B (en) | 1987-01-28 |
| EP0161721B1 (en) | 1988-05-04 |
| JPS60245732A (en) | 1985-12-05 |
| CN1003943B (en) | 1989-04-19 |
| DE3418468A1 (en) | 1985-11-21 |
| CA1258376A (en) | 1989-08-15 |
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