CN1062553A - Belt type roasting machine roasting iron ore pellets novel process - Google Patents
Belt type roasting machine roasting iron ore pellets novel process Download PDFInfo
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- CN1062553A CN1062553A CN 90106083 CN90106083A CN1062553A CN 1062553 A CN1062553 A CN 1062553A CN 90106083 CN90106083 CN 90106083 CN 90106083 A CN90106083 A CN 90106083A CN 1062553 A CN1062553 A CN 1062553A
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- roasting
- temperature
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- iron ore
- magnetite concentrate
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Abstract
The present invention be to existing belt type roasting machine roasting magnetite concentrate, in join solid-fuelled magnetite concentrate, magnetite concentrate and red iron ore concentrate mixing ore deposit and in join the improvement of solid-fuelled red iron ore pellets ore deposit sinter process, adopt high-temperature roasting behind the first low temperature.The present invention is under the prerequisite that guarantees pellet quality, save roasting energy consumption 8～12% for roasting magnetite concentrate, magnetite concentrate with red ferromagnetic iron ore mixing ore deposit pelletizing, for joining solid-fuelled magnetite concentrate pellet in the roasting, save burnup 10～20%, save energy consumption 30～40% for joining solid fuel Chi Tiejingkuangqiutuankuang in the roasting, make pellet integral product quality homogenizing simultaneously, accelerate rate of roasting, boost productivity.
Description
The invention belongs to iron ore pellet ore deposit sinter process, particularly belt type roasting machine roasting pellet technology.
Pellet is to be body material with the iron ore concentrate, with addition of some complementary additives, Jia Shui, make the ball roasting and form.According to produce raw material that pellet uses and whether in join solid fuel, the iron ore pellets ore deposit is divided into five kinds:
1. common magnetite concentrate pelletizing;
2. common red iron ore pellets;
3. join solid fuel magnetite concentrate pelletizing in;
4. join the red iron ore pellets of solid fuel in;
5. magnetite concentrate and red iron ore concentrate mixing ore deposit pelletizing.
According to the difference of roasting, from roasting method, can be divided three classes again with equipment:
1. shaft furnace pellet;
2. belt type roasting machine pellet;
3. grate kiln pellet.
Common magnetite concentrate pelletizing, magnetite concentrate and red iron ore concentrate mixing ore deposit pelletizing, in join solid-fuelled Chi Tiejingkuangqiutuankuang and in join solid fuel magnetite concentrate pelletizing all will be because of the Fe of pellet inside
3O
4The burning of oxidation or C or both react and heat release simultaneously, constitute " endogenous pyrogen " in the pellet.
For the common magnetite concentrate pelletizing of roasting, or magnetite concentrate and red iron ore concentrate mixing ore deposit pellet, traditional belt type roasting machine sinter process is that pellet was descended dry 8-12 minute at 200-400 ℃, enter the preheating zone after the drying at 800-1000 ℃ of following preheating 2-4 minute, after the preheating, enter the roasting band, at 1250-1350 ℃ of following roasting 10-15 minute, at 800-1000 ℃ of following soaking 2-4 minute, cool off at last then.
For joining solid-fuelled Chi Tiejingkuangqiutuankuang in the roasting, present belt type roasting machine sinter process is that pellet was descended dry 8-12 minute at 200-400 ℃, enter the preheating zone after the drying, through 800-1000 ℃ of preheating 1-3 minute, enter the roasting band then at 1200-1300 ℃ of following roasting 6-10 minute, roasting after 800-1000 ℃ soaking 4-8 minute, cool off at last.
In roasting process, because the effect of " endogenous pyrogen " exothermic heat of reaction and bed of material accumulation of heat in the pellet, material middle and lower part temperature will be higher than the temperature of bed of material top and heating air flow, and more by material layer lower part, its temperature is high more, under traditional belt type roasting machine sinter process, when roasting magnetite concentrate and magnet, red iron collective concentrate pelletizing, the temperature distribution in the bed of material as shown in Figure 1.Because between the oxidation rate of magnetite and the temperature relation curve maximum is arranged, and for Fe
3O
4Oxidation rate, have an optimum temperature range, make Fe
3O
4Oxidation rate reaches maximum value, and simultaneously the temperature rising degree in the bed of material is that quickening with the magnetite oxidation rate raises.Under traditional technology because in the bed of material, temperature of lower is too high, not only be unfavorable for the rising of material layer temperature like this, also be unfavorable for Fe in addition
3O
4Oxidising process, so Fe
3O
4Oxidation heat liberation be not fully utilized, simultaneously, bed of material upper, middle and lower portion temperature levels is also inhomogeneous, so the inevitable also heterogeneity of pellet quality.
With joining solid-fuelled Chi Tiejingkuangqiutuankuang in the present roasting, the temperature distribution in its bed of material as shown in Figure 2.By the burning heat release and the bed of material accumulation of heat effect of carbon, the combustionvelocity of carbon dull quickening simultaneously with the rising of temperature.Therefore the material layer lower part humidity province is higher than upper temp, under this sinter process, if will guarantee that the top pelletizing obtains thorough roasting, and material layer lower part inevitable " burning ", otherwise, as making bottom not burning of pelletizing, the then inevitable underroasting of top pelletizing.In addition, under this sinter process, in the bed of material, temperature of lower is difficult to control, the solid-fuelled burning heat release of joining in therefore can't making full use of, pellet quality that cannot say for sure to demonstrate,prove bed of material upper, middle and lower simultaneously is even, makes decrease in yield.
In a word, the characteristics of above traditional technology are, the heat-up rate by an amount of control warm up time pellet makes pelletizing enter high temperature calcination section then, and direct roasting bed of material middle and upper part pelletizing uses the accumulation of heat effect roasting material layer lower part pelletizing of the bed of material at last.What this method can not be brought into play " endogenous pyrogen " in the pellet to greatest extent should have effect, and the roasting process energy consumption is big, simultaneously because the effect of bed of material accumulation of heat, and bed of material middle and lower part difficult control of temperature, uniform in quality is poor, and yield rate is lower.
The objective of the invention is to improve existing sinter process, roasting is divided into two stages of high temperature behind the first low temperature, and " endogenous pyrogen " in the pellet maximally utilised, and controls bed of material middle and lower part temperature effectively, improves the quality of product.
According to " endogenous pyrogen " in the pellet characteristics of exothermic effects in roasting process, the present invention then will be according to the material condition difference of producing pellet, pelletizing was descended dry 8-12 minute at 200-400 ℃, after the drying, directly between 1000-1150 ℃ low-temperature bake 6-10 minute, at 1250-1350 ℃ of following high-temperature roasting 5-9 minute, after soaking 2-4 between 800-1000 ℃ minute, cool off again then.
Roasting of the present invention is divided into high temperature behind the first low temperature, and in two stages, the ratio of the time of low-temperature bake band with the time of high-temperature roasting band is 2/3-2.0.The roasting time summation of two roasting bands is 13-17 minute.Pellet is at first at lower roasting temperature, and the temperature of low-temperature bake is to reach 1250-1350 ℃ with bed of material middle and lower part temperature to be as the criterion, and according to material condition, the temperature of low-temperature bake band is 1000-1150 ℃.
One of characteristics of the present invention are after adopting low-temperature bake, can maximally utilise " endogenous pyrogen " in the pellet.
Two of characteristics of the present invention are utilized the heat release of " endogenous pyrogen " in the pellet and the accumulation of heat effect of the bed of material, at first make in the bed of material, the bottom enters higher temperature baking and concretion, and then improve temperature roasting bed of material top pelletizing.
Three of characteristics of the present invention are to control bed of material upper, middle and lower portion temperature easily, bed of material upper, middle and lower temperature levels homogeneous (the temperature distribution situation behind use the present invention in the pellet bed of material is seen Fig. 3), thus make pellet quality even, can improve yield rate.
Use novel roasting process of the present invention can make the roasting energy consumption decline 10-15% of magnetite concentrate pelletizing, magnet, red iron collective concentrate pelletizing, ultimate compression strength is greater than 200kg/, join solid-fuelled magnetite concentrate pelletizing in the roasting, total energy consumption decline 10-20%, intensity is greater than 180kg/, join solid-fuelled red iron ore pellets in the roasting, total energy consumption decline 20-30%, ultimate compression strength is greater than 180kg/.
Embodiment:
Material condition
Quality product and energy-saving effect:
Ultimate compression strength (kg/)
Press mixed gas calorific value 3000kcal/m
3Meter can replace 25.37NM
3/ T saves coal gas 7.5NM
3/ T can further reduce the coal blending amount and reduce the heating air flow temperature if improve the bed of material.
Claims (1)
1, a kind of iron ore pellet ore deposit sinter process, adopt belt type roasting machine, carry out drying, roasting, soaking, cooling, it is characterized in that directly low-temperature bake 6～10 minutes between 1000～1150 ℃ of dried pelletizing, then 1250～1350 ℃ of following high-temperature roastings 5～9 minutes, the ratio of the time of low-temperature bake band and the time of high-temperature roasting band is that the roasting time summation of 2/3～2.0, two roasting bands is 13～17 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106083 CN1023411C (en) | 1990-12-22 | 1990-12-22 | Technology for roasting concentrated iron ore pellets on band-type roasting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106083 CN1023411C (en) | 1990-12-22 | 1990-12-22 | Technology for roasting concentrated iron ore pellets on band-type roasting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1062553A true CN1062553A (en) | 1992-07-08 |
| CN1023411C CN1023411C (en) | 1994-01-05 |
Family
ID=4879789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90106083 Expired - Fee Related CN1023411C (en) | 1990-12-22 | 1990-12-22 | Technology for roasting concentrated iron ore pellets on band-type roasting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1023411C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297818C (en) * | 2005-02-24 | 2007-01-31 | 北京科技大学 | Pelle roasting simulation tester and method thereof |
| CN102312085A (en) * | 2011-07-28 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Method for producing magnet concentrate fine sintered ore |
| CN102401564A (en) * | 2010-09-13 | 2012-04-04 | 五冶集团上海有限公司 | Installation method of belt type roasting machine |
| CN107130070A (en) * | 2017-04-27 | 2017-09-05 | 酒泉钢铁(集团)有限责任公司 | A kind of calcium-magnesium-containing pellet and preparation method thereof |
-
1990
- 1990-12-22 CN CN 90106083 patent/CN1023411C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297818C (en) * | 2005-02-24 | 2007-01-31 | 北京科技大学 | Pelle roasting simulation tester and method thereof |
| CN102401564A (en) * | 2010-09-13 | 2012-04-04 | 五冶集团上海有限公司 | Installation method of belt type roasting machine |
| CN102401564B (en) * | 2010-09-13 | 2014-12-10 | 五冶集团上海有限公司 | Installation method of belt type roasting machine |
| CN102312085A (en) * | 2011-07-28 | 2012-01-11 | 山西太钢不锈钢股份有限公司 | Method for producing magnet concentrate fine sintered ore |
| CN102312085B (en) * | 2011-07-28 | 2013-06-12 | 山西太钢不锈钢股份有限公司 | Method for producing magnet concentrate fine sintered ore |
| CN107130070A (en) * | 2017-04-27 | 2017-09-05 | 酒泉钢铁(集团)有限责任公司 | A kind of calcium-magnesium-containing pellet and preparation method thereof |
| CN107130070B (en) * | 2017-04-27 | 2019-06-21 | 酒泉钢铁(集团)有限责任公司 | A kind of calcium-magnesium-containing pellet and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1023411C (en) | 1994-01-05 |
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