CN102268542B - Method for preparing hematite powder pellets - Google Patents
Method for preparing hematite powder pellets Download PDFInfo
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- CN102268542B CN102268542B CN 201110220324 CN201110220324A CN102268542B CN 102268542 B CN102268542 B CN 102268542B CN 201110220324 CN201110220324 CN 201110220324 CN 201110220324 A CN201110220324 A CN 201110220324A CN 102268542 B CN102268542 B CN 102268542B
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Abstract
The invention relates to a method for preparing hematite powder pellets. The method comprises the steps of proportioning, mixing, pelletizing and roasting, and is characterized in that: iron carbonate ore powder in weight ratio of 5-15 percent, which is subjected to damp-mill pretreatment, is added during proportioning of hematite powder and bentonite. The method comprises the following specific steps of: I, performing damp-mill pretreatment on the iron carbonate ore powder: filtering the iron carbonate ore powder with water content of not more than 8.5 percent or drying in a rotary drum dryer to keep the water content of the iron carbonate ore powder not more than 6.5 percent, and feeding the iron carbonate ore powder into a damp mill to perform the damp-mill pretreatment; II, proportioning: proportioning the iron carbonate ore powder, the hematite powder and the bentonite in the following percentage by weight: 5-15 percent of iron carbonate ore powder, 83.5-93 percent of hematite powder and 0.5-2 percent of bentonite; III, pelletizing: uniformly mixing the components, adding the components into a pan pelletizer and replenishing water for pelletizing to produce pellets; and IV, roasting: distributing and roasting on a chain grate machine-rotary kiln to obtain finished product pellets. The hematite powder pellets prepared by using the method disclosed by the invention has the advantages of low preheating combustion temperature and high strength.
Description
Technical field
The present invention relates to a kind of manufacture method of ground hematite pelletizing.
Background technology
In recent years, along with the development of China's Iron And Steel Industry, newly-built a lot of bar grate kiln production lines.Compare with traditional Shaft Furnace Pelletizing Process production technique, adopt the pellet quality of grate kiln explained hereafter better, guaranteed to a certain extent blast furnace steady running.The powdered iron ore that present production pelletizing is used mainly contains two kinds, and a kind of is magnetite powder, and another kind is ground hematite.After the magnetite powder pelletizing, during with the roasting of grate kiln technique, generally about 900-950 ℃, this moment, pellet strength can reach the 400N/ that enters the rotary kiln regulation to its preheating and baking temperature
Individual pelletizingAbove requirement of strength, after pre-hot-bulb enters rotary kiln, in the temperature roasting below 1200 ℃, the intensity of its finished ball can reach 2500 newton/
Individual pelletizingMore than.And during the ground hematite pellet roasting, because its intrinsic baking property, general preheating temperature need to be at the 400N/ that just can reach the rotary kiln regulation more than 1000 ℃
Individual pelletizingAbove requirement of strength, after simultaneously pre-hot-bulb enters rotary kiln, in the temperature roasting more than 1250 ℃, the intensity of its finished ball can reach 2500 newton/
Individual pelletizingMore than.And the material of present domestic drying grate is high temperature steel, and the temperature of generally bearing is below 1000 ℃, and when working more than 1000 ℃, drying grate ruptures easily, has an accident for a long time.In addition, 1250 ℃ high temperature causes the regional area ring formation easily in the rotary kiln, and what impact was produced normally carries out.
At present, the enterprise for main grate kiln take ground hematite as raw material is produced pelletizing mainly takes to add after-burning stove at the drying grate preheating section, blasts high-temperature gas in preheating section, to improve the intensity of preheated pellets.This method only can improve the intensity of preheated pellets, but in rotary kiln during roasting, maturing temperature is still very high, the easy ring formation of rotary kiln.In addition because increase after-burning stove, so also increased production cost.
Summary of the invention:
For the above-mentioned deficiency of the manufacture method of existing ground hematite pelletizing, the invention provides a kind of manufacture method of ground hematite pelletizing, the ground hematite pelletizing preheated burning temperature made from present method is low, and intensity is high.
The manufacture method of this ground hematite pelletizing comprises batching, mixing, pelletizing and roasting, and its feature is being: when ground hematite and wilkinite batching, also with addition of being the iron carbonate breeze of 5%-15% through the pretreated weight proportion of profit mill.
The steps characteristic of the manufacture method of this ground hematite pelletizing is:
(1) iron carbonate breeze profit mill pre-treatment:
Water ratio is not more than 8.5% iron carbonate breeze after filtration or in rotary drum dryer after the oven dry, the water ratio of iron carbonate breeze is not more than 6.5%; Send into and moisten the mill pre-treatment in the damp mill, make the iron carbonate breeze improve 5%-15% less than the ratio of 0.074mm;
TFe, FeO, SiO in the iron carbonate breeze
2, CaO and MgO weight percent be:
TFe 33-36％；FeO 25-28％；SiO
2 3-5％；
CaO 7-9％；MgO 4-7％；
Ratio less than 0.074mm is: 62-73%;
Scaling loss (Ig), 28-33%.
(2) batching:
Iron carbonate breeze, ground hematite and wilkinite are prepared burden by following weight percent, and concrete proportioning is:
Iron carbonate breeze 5%-15%
Ground hematite 83.5%-93%,
Wilkinite 0.5-2%,
(3) pelletizing
Above-mentioned each component is through the mixer mixing, then adds in the balling disc make up water pelletizing and produces pelletizing, obtains the pelletizing that water ratio is 9.0%-9.6% (by weight percentage), and median size is 9mm-15mm;
(4) roasting
Carry out cloth, roasting at grate kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 170-220 ℃, and the exhausting temperature is 200-260 ℃, and the drying grate preheating temperature is 900-1000 ℃, and the rotary kiln baking temperature is 1200-1260 ℃.
The drying grate preheating temperature is different, and preheated pellets intensity is also different, and in 900-1000 ℃ of scope, the higher preheated pellets intensity of drying grate preheating temperature is higher.
The pelletizing of the manufacture method system of this ground hematite pelletizing, when the preheating temperature of pelletizing was 900-1000 ℃, its pre-hot-bulb intensity can reach 400N/
Individual pelletizingMore than, the intensity of finished ball can reach 2500N/
Individual pelletizingMore than.The maturing temperature of drying grate is more than 1000 ℃ the time, if long-time the use, damage easily the grate plate of drying grate, in addition rotary kiln baking temperature easy ring formation more than 1250 ℃ time the, so the present invention is specially adapted to the grate kiln production line and mainly uses ground hematite to produce the enterprise of pelletizing.
The beneficial effect of the manufacture method of this ground hematite pelletizing: (1) by in ground hematite with addition of being 5%-15% iron carbonate breeze through the proportioning of profit tribulation art breading, when reducing the pelletizing preheating temperature, the intensity that pelletizing enters rotary kiln can also be improved, the technical barrier that preheating temperature is high, preheated pellets intensity is low that runs into when ground hematite is produced pelletizing can be solved to a certain extent; (2) reduce the maturing temperature of pelletizing in rotary kiln, avoided rotary kiln Yin Gaowen and ring formation, need often stop the production difficult problem that kiln is processed; (3) method provided by the invention is particularly useful for mainly using ground hematite to be the grate kiln explained hereafter enterprise of raw material, and the material of its drying grate can not be born the situation more than 1000 ℃ for a long time.
Embodiment
Further specify the specific embodiment of the present invention below by embodiment, but the specific embodiment of the present invention is not limited to following examples.
Embodiment 1
Present embodiment adopts and prepares the ground hematite pelletizing through Pretreatment by high pressure roller grinding.
The concrete steps of present embodiment are as follows:
(1) iron carbonate breeze profit mill pre-treatment:
Choose raw material: Dai County's iron carbonate breeze, scaling loss are 31%, and granularity is 67% less than the content of 0.074mm, and the water ratio of iron carbonate breeze is 8.5%;
After the iron carbonate breeze is dried in rotary drum dryer, reach suitable moisture 6.5% after, send into and moisten the mill pre-treatment in the damp mill;
When going out damp mill, the carbonic acid iron powder brings up to 73% less than the ratio of 0.074mm by 67%;
(2) batching:
The pretreated iron carbonate breeze of profit mill, ground hematite and wilkinite are prepared burden by following weight percent:
Iron carbonate breeze 6%
Ground hematite 92.7%,
Wilkinite 1.3%,
Present embodiment is to produce continuously, and three kinds of raw materials are 250 tons of feed per hour.
(3) pelletizing
Above-mentioned each component is through the mixer mixing, then adds in the balling disc make up water and produces pelletizing, obtains by weight percentage water ratio and be 9.2% pelletizing, and median size is 11mm-16mm;
(4) roasting
Carry out cloth, roasting at grate kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and the drying grate preheating temperature is 950-1000 ℃, and the rotary kiln baking temperature is 1210-1260 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was 315N/ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach 423N/ pelletizing, and when the rotary kiln baking temperature was 1240 ℃, finished ball intensity was 2512N/ pelletizing;
When the drying grate preheating temperature was 1000 ℃, preheated pellets intensity can reach 527/ pelletizing, and when the rotary kiln baking temperature was 1250 ℃, finished ball intensity was 2772N/ pelletizing.
But present embodiment is batch production also, and each component weight sum is 100 tons in step (2).
Embodiment 2
Present embodiment adopts and prepares the ground hematite pelletizing through Pretreatment by high pressure roller grinding.
The concrete steps of present embodiment are as follows:
(1) iron carbonate breeze profit mill pre-treatment:
Choose raw material: Dai County's iron carbonate breeze, scaling loss are 31%, and granularity is 67% less than the content of 0.074mm, and the water ratio of iron carbonate breeze is 8.5%;
The iron carbonate breeze after filtering, reach suitable moisture 6.5% after, send into and moisten the mill pre-treatment in the damp mill;
When going out damp mill, the carbonic acid iron powder brings up to 75% less than the ratio of 0.044mm by 67%;
(2) batching:
The pretreated iron carbonate breeze of profit mill, ground hematite and wilkinite are prepared burden by following weight percent:
Iron carbonate breeze 9%
Ground hematite 89.7%,
Wilkinite 1.3%,
Present embodiment is batch production, and each component weight sum is 100 tons.
(3) pelletizing:
Above-mentioned each component is through the mixer mixing, then adds in the balling disc make up water and produces pelletizing, obtains by weight percentage water ratio and be 9.0% pelletizing, and median size is about 14mm.
(4) roasting:
Carry out cloth, roasting at grate kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and the drying grate preheating temperature is 900-960 ℃, and the rotary kiln baking temperature is 1210-1250 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was 387N/ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach 485N/ pelletizing, and when the rotary kiln baking temperature was 1240 ℃, finished ball intensity was 2603N/ pelletizing;
When the drying grate preheating temperature was 1000 ℃, preheated pellets intensity can reach 565/ pelletizing, and when the rotary kiln baking temperature was 1250 ℃, finished ball intensity was 2832N/ pelletizing.
The iron carbonate breeze of above-mentioned two embodiment is identical, TFe, FeO, SiO in the iron carbonate breeze
2, CaO and MgO weight percent be:
TFe 34％；FeO 26％；SiO
2 4％；CaO 8％；MgO 6％；
Ratio less than 0.074mm is: 68%;
Scaling loss (Ig), 30%.
Used ground hematite and the wilkinite of embodiment 2 and embodiment 1 is identical, further strengthen iron carbonate breeze proportioning after, the preheating temperature of pelletizing further descends, pre-hot-bulb intensity further improves, maturing temperature reduces in the rotary kiln simultaneously, and finished ball intensity is improved, and has reached desired result.
Present embodiment is to produce continuously, three kinds of raw materials, 250 tons of feed per hour in step (2).
Above-mentioned two embodiment
The embodiment of contrast
With addition of the iron carbonate breeze of processing through moistening grinding process, powdered iron ore only is not the pelletizing of ground hematite to present embodiment:
The concrete steps that prepare the ground hematite pelletizing by present method are as follows:
(1) batching:
Ground hematite and wilkinite are prepared burden by following weight percent:
Ground hematite 98.5%
Wilkinite 1.5%
Present embodiment is to produce continuously, and two kinds of raw materials are 250 tons of feed per hour.
Wherein ground hematite is the Lanxian County fine iron breeze, and FeO content is 6.3%, and granularity is 87% less than the content of 0.044mm, and the water ratio of ground hematite is 8.5%.
(2) pelletizing:
Then said components adds make up water production in the balling disc through the mixer mixing, obtains water ratio and be 9.1% green pellets;
(3) roasting:
Carry out cloth, roasting at grate kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is: blast temperature is 190-210 ℃, and the exhausting temperature is 210-240 ℃, and preheating temperature is 900-1000 ℃, and the rotary kiln baking temperature is 1210-1250 ℃.
When the drying grate preheating temperature was 960 ℃, preheated pellets intensity was 243N/ pelletizing;
When the drying grate preheating temperature was 980 ℃, preheated pellets intensity can reach 282N/ pelletizing, and when the rotary kiln baking temperature was 1240 ℃, finished ball intensity was 2321N/ pelletizing;
When the drying grate preheating temperature was 1040 ℃, preheated pellets intensity can reach 417/ pelletizing, and when the rotary kiln baking temperature was 1250 ℃, finished ball intensity was 2432N/ pelletizing.
When the drying grate preheating temperature was 1060 ℃, preheated pellets intensity was 487N/ pelletizing, and during 1250 ℃ of rotary kiln baking temperature, finished ball intensity is 2512N/ pelletizing.
The ground hematite of above-mentioned three embodiment is identical with wilkinite, embodiment one and embodiment two add in raw material after the iron carbonate breeze joins, compare with the comparative example, the preheating temperature of pelletizing obviously descends, improved pre-hot-bulb intensity, maturing temperature reduces in the rotary kiln simultaneously, and finished ball intensity is improved, and has reached desired result.
Claims (3)
1. the manufacture method of a ground hematite pelletizing, it comprises batching, mixing, pelletizing and roasting, it is characterized in that: when ground hematite and wilkinite batching, with addition of being the iron carbonate breeze of 5%-15% through the pretreated weight proportion of profit mill.
2. the manufacture method of ground hematite pelletizing according to claim 1 is characterized in that:
The pre-treatment of I iron carbonate breeze profit mill
Water ratio is not more than 8.5% iron carbonate breeze after filtration or in rotary drum dryer after the oven dry, the water ratio of iron carbonate breeze is not more than 6.5%; Send into and moisten the mill pre-treatment in the damp mill, make the iron carbonate breeze improve 5%-15% less than 325 purpose ratios;
TFe, FeO, SiO in the iron carbonate breeze
2, CaO and MgO weight percent be:
TFe 33-36％；FeO 25-28％；SiO
2 3-5％；
CaO 7-9％； MgO 4-7％；
Ratio less than 0.074mm is: 62-73%;
The II batching:
Iron carbonate breeze, ground hematite and wilkinite are prepared burden by following weight percent:
Iron carbonate breeze 5%-15%
Ground hematite 83.5%-93%
Wilkinite 0.5-2%;
The III pelletizing
Above-mentioned each component is through the mixer mixing, then adds in the balling disc make up water pelletizing and produces pelletizing, obtains the pelletizing that water ratio is 9.0%-9.6%, and median size is 9mm-15mm;
The IV roasting
Carry out cloth, roasting at grate kiln, obtain finished pellet; Wherein the thermal regulation of drying grate is that blast temperature is 170-220 ℃, and the exhausting temperature is 200-260 ℃, and the drying grate preheating temperature is 900-1000 ℃, and the rotary kiln baking temperature is 1200-1260 ℃.
3. the manufacture method of ground hematite pelletizing according to claim 2, it is characterized in that the drying grate preheating temperature be following any:
The drying grate preheating temperature is 960 ℃;
The drying grate preheating temperature is 980 ℃;
The drying grate preheating temperature is 1000 ℃.
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| CN 201110220324 CN102268542B (en) | 2011-07-28 | 2011-07-28 | Method for preparing hematite powder pellets |
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| CN 201110220324 CN102268542B (en) | 2011-07-28 | 2011-07-28 | Method for preparing hematite powder pellets |
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