CN102268542A - Method for preparing hematite powder pellets - Google Patents
Method for preparing hematite powder pellets Download PDFInfo
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- CN102268542A CN102268542A CN2011102203242A CN201110220324A CN102268542A CN 102268542 A CN102268542 A CN 102268542A CN 2011102203242 A CN2011102203242 A CN 2011102203242A CN 201110220324 A CN201110220324 A CN 201110220324A CN 102268542 A CN102268542 A CN 102268542A
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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 pellet formation technology, adopt the pellet quality of grate kiln explained hereafter better, guaranteed blast furnace steady running to a certain extent.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 a ground hematite.After magnetite powder was made ball, during with the roasting of grate kiln technology, 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 inherent roasting characteristic, general preheating temperature need 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 a 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 influence was produced normally carries out.
At present, the enterprise for the grate kiln that mainly with the ground hematite is 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 preheating pelletizing.This method only can improve the intensity of preheating pelletizing, 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, the intensity height.
The manufacture method of this ground hematite pelletizing comprises batching, mixes, makes ball 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 step of manufacturing feature 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, and 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) make ball
Above-mentioned each component is through the mixer mixing, adds in the balling disc make up water then and makes ball and produce pelletizing, obtains the pelletizing that water ratio is 9.0%-9.6% (by weight percentage), and median size is 9mm-15mm;
(4) roasting
On grate kiln, carry out cloth, roasting, 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 ℃.
Drying grate preheating temperature difference, preheating pellet strength are also different, and in 900-1000 ℃ of scope, the high more preheating pellet strength of drying grate preheating temperature is high more.
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 the grate plate of drying grate easily, rotary kiln baking temperature easy ring formation more than 1250 ℃ time the, so the present invention in addition 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 preheating temperature height that runs into when ground hematite is produced pelletizing, the technical barrier that the preheating pellet strength is low 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 handled; (3) method provided by the invention is particularly useful for mainly using the grate kiln explained hereafter enterprise of ground hematite as 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 the high pressure roller mill pre-treatment.
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 a continuous production, and three kinds of raw materials are 250 tons of feed per hour.
(3) make ball
Above-mentioned each component is through the mixer mixing, adds in the balling disc make up water then and produces pelletizing, obtains by weight percentage water ratio and be 9.2% pelletizing, and median size is 11mm-16mm;
(4) roasting
On grate kiln, carry out cloth, roasting, 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 ℃, the preheating pellet strength was a 315N/ pelletizing;
When the drying grate preheating temperature was 980 ℃, the preheating pellet strength 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 ℃, the preheating pellet strength 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 the high pressure roller mill pre-treatment.
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 a batch production, and each component weight sum is 100 tons.
(3) make ball:
Above-mentioned each component is through the mixer mixing, adds in the balling disc make up water then and produces pelletizing, obtains by weight percentage water ratio and be 9.0% pelletizing, and median size is about 14mm.
(4) roasting:
On grate kiln, carry out cloth, roasting, 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 ℃, the preheating pellet strength was a 387N/ pelletizing;
When the drying grate preheating temperature was 980 ℃, the preheating pellet strength 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 ℃, the preheating pellet strength 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 a continuous production, three kinds of raw materials, 250 tons of feed per hour in step (2).
Above-mentioned two embodiment
Correlated embodiment
With addition of the iron carbonate breeze of handling through the profit 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 a continuous production, 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) make ball:
Said components adds make up water production in the balling disc then through the mixer mixing, obtains water ratio and be 9.1% green pellets;
(3) roasting:
On grate kiln, carry out cloth, roasting, 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 ℃, the preheating pellet strength was a 243N/ pelletizing;
When the drying grate preheating temperature was 980 ℃, the preheating pellet strength 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 ℃, the preheating pellet strength 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 ℃, the preheating pellet strength was a 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, mixes, makes ball 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, and 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%;
III makes ball
Above-mentioned each component is through the mixer mixing, adds in the balling disc make up water then and makes ball and produce pelletizing, obtains the pelletizing that water ratio is 9.0%-9.6%, and median size is 9mm-15mm;
The IV roasting
On grate kiln, carry out cloth, roasting, 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063348A (en) * | 2015-08-19 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Fluxed MgO pellet ore production method |
| CN107779591A (en) * | 2017-12-05 | 2018-03-09 | 太原钢铁(集团)有限公司 | A kind of method of grate kiln coal powder injection production pellet |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
Non-Patent Citations (1)
| Title |
|---|
| 樊绍良等: "峨口铁矿尾矿中碳酸铁的回收与利用研究", 《矿业快报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063348A (en) * | 2015-08-19 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Fluxed MgO pellet ore production method |
| CN107779591A (en) * | 2017-12-05 | 2018-03-09 | 太原钢铁(集团)有限公司 | A kind of method of grate kiln coal powder injection production pellet |
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