CN115261615B - Sintering batching method for return ore grading layering distribution - Google Patents
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- CN115261615B CN115261615B CN202210911701.5A CN202210911701A CN115261615B CN 115261615 B CN115261615 B CN 115261615B CN 202210911701 A CN202210911701 A CN 202210911701A CN 115261615 B CN115261615 B CN 115261615B
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- 238000005245 sintering Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000009826 distribution Methods 0.000 title claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 57
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 45
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 23
- 239000000292 calcium oxide Substances 0.000 claims abstract description 18
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims description 20
- 239000004744 fabric Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 238000003892 spreading Methods 0.000 claims description 5
- 230000007480 spreading Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000009776 industrial production Methods 0.000 abstract description 3
- 238000005469 granulation Methods 0.000 abstract 1
- 230000003179 granulation Effects 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Abstract
The invention discloses a sintering and proportioning method for return ore grading and layering distribution, which is characterized by comprising the following steps of: the return ores are classified into small-particle-size return ores and large-particle-size return ores; conveying iron ore powder; conveying sintered coal and quicklime powder; conveying small-particle-size return ores; mixing and granulating to obtain mixed material particles; primary material distribution of mixed material particles; distribution of large-particle-size return ores; and (3) secondarily distributing the mixed material particles until the sintering trolley is fully distributed. The invention has simple operation and convenient processing, classifies the return ores, completes granulation of the return ores with small particle size and other materials in the mixer, forms mixed material particles with uniform particle size, and then distributes the mixed material particles and the return ores with large particle size on the sintering trolley in a layering way, thereby effectively improving the air permeability of the sintering burden layer and realizing industrial production.
Description
Technical Field
The invention relates to an improvement of a sintering batching method, belongs to the technical field of sintering processes in the metallurgical industry, and particularly relates to a sintering batching method for grading and layering distribution of return ores.
Background
The sintering process is a process of sintering and proportioning powdery mineral powder, quicklime, sintered coal, return ore and other raw materials, and then generating blocky sintered ore with certain metallurgical properties through chemical reactions such as combustion and the like. The sintering burden is the front end flow of the sintering process, and different materials such as mineral powder, quicklime, sintered coal, return ore and the like are intensively mixed into a mixture and are once again filled into a sintering trolley. The return ore is one of important raw materials of the sintering ingredients, is the sintered ore formed after sintering is completed, and is subjected to 5mm sieve to obtain particles with smaller granularity, wherein the sintered ore with the particle size smaller than 5mm cannot enter the next process and can only be used as a raw material to be returned to the sintering ingredients for recycling, and after the return ore is added into the sintering ingredients, the air permeability of the sintering process can be increased, and the sintering efficiency is improved; through detection, in the conventional sintering batching method for intensively mixing and loading the materials into the sintering trolley at one time, the negative suction pressure in the sintering process is-17 kPa, and the comprehensive fuel consumption is 52kg of standard coal. The existing sintering batching method has the defects that; if various materials in the sintering ingredients are unevenly mixed, insufficient combustion can be caused, and the metallurgical performance is reduced; in the concentrated mixing process of various materials, because the particle sizes of different materials are irregular, especially the large-particle-size return ore can not complete the granulating process with the iron ore powder in a mixer, so that the effect of the return ore can not be fully exerted; therefore, how to fully develop the return ore performance by sintering the batch is the main research direction of the sintering batch at present.
Disclosure of Invention
The invention aims to provide a sintering batching method for grading and layering distribution of return ores, which is simple to operate and convenient to process, has the particle size smaller than 5mm, and can realize industrial production by layering distribution on a sintering trolley, and effectively improve the air permeability of a material layer.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The sintering and proportioning method for the return ore grading and layering distribution is characterized by comprising the following steps of:
(1) Grading return ores: screening the return ores with the particle size smaller than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size smaller than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing for later use;
(2) Conveying iron ore powder: flatly paving iron ore powder on a conveying belt through a blanking device, wherein the blanking amount is 600-700 t/h;
(3) Conveying sintered coal and quicklime powder: in the process of the forward running of the conveying belt, spreading sintered coal and quicklime powder on the conveying belt through a blanking device respectively, wherein the blanking amount of the sintered coal is 3-5% of the blanking amount of the iron ore powder, and the blanking amount of the quicklime powder is 5-10% of the blanking amount of the iron ore powder;
(4) Conveying small-particle-size return ores: in the process of the forward running of the conveying belt, the small-grain-size return ores are paved on the conveying belt through a blanking device, and the blanking amount of the small-grain-size return ores is 5-10% of the blanking amount of the iron ore powder;
(5) Mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotation speed and the water adding amount of the primary mixer and the secondary mixer are regulated, the total mixing time of the primary mixer and the secondary mixer is 4-5 min, mixed material particles are obtained, and the moisture content of the mixed material particles is controlled to be 7.5-8.0%;
(6) Primary distribution of mixed material particles: the mixed material particles are paved on a sintering trolley through a distributing machine, wherein the paving height is 1/3 of the height of the sintering trolley;
(7) Cloth of large-particle-size return ores: paving the large-grain size return ores on the mixed material particles of the sintering trolley through a distributing machine, wherein the paving thickness is 5-8 mm;
(8) Secondary distribution of mixed material particles: and (3) paving the mixed material particles on the large-particle-size return ores of the sintering trolley through a distributing machine until the sintering trolley is fully distributed.
Through detection, when the sintering ingredients obtained by adopting the technical scheme are sintered, the negative pressure of the air draft is reduced to-15 kPa, the comprehensive fuel consumption is 50kg of standard coal, and the air permeability of the sintering ingredients layer is obviously improved.
The invention has the beneficial effects that: the method has the advantages that the operation is simple, the processing is convenient, the return ores are classified, the small-particle-size return ores and other materials are granulated in the mixer, mixed material particles with uniform particle sizes are formed, and the mixed material particles and the large-particle-size return ores are layered and distributed on the sintering trolley, so that the air permeability of a sintering material distribution layer is effectively improved, and the industrial production is realized.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to specific embodiments.
Example 1:
the sintering and proportioning method for the return ore grading and layering distribution is characterized by comprising the following steps of:
(1) Grading return ores: screening the return ores with the particle size smaller than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size smaller than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing for later use;
(2) Conveying iron ore powder: flatly paving iron ore powder on a conveying belt through a blanking device, wherein the blanking amount is 600t/h;
(3) Conveying sintered coal and quicklime powder: in the process of the forward running of the conveying belt, spreading sintered coal and quicklime powder on the conveying belt through a blanking device respectively, wherein the blanking amount of the sintered coal is 3% of the blanking amount of the iron ore powder, and the blanking amount of the quicklime powder is 5% of the blanking amount of the iron ore powder;
(4) Conveying small-particle-size return ores: in the process of forward running of the conveying belt, the small-grain-size return ores are paved on the conveying belt through a blanking device, and the blanking amount of the small-grain-size return ores is 5% of the blanking amount of the iron ore powder;
(5) Mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotation speed and the water adding amount of the primary mixer and the secondary mixer are regulated, the total mixing time of the primary mixer and the secondary mixer is 4min, mixed material particles are obtained, and the moisture content of the mixed material particles is controlled to be 7.5%;
(6) Primary distribution of mixed material particles: the mixed material particles are paved on a sintering trolley through a distributing machine, wherein the paving height is 1/3 of the height of the sintering trolley;
(7) Cloth of large-particle-size return ores: paving the large-grain size return ores on the mixed material particles of the sintering trolley through a distributing machine, wherein the paving thickness is 5mm;
(8) Secondary distribution of mixed material particles: and (3) paving the mixed material particles on the large-particle-size return ores of the sintering trolley through a distributing machine until the sintering trolley is fully distributed.
Through detection, when the sintering ingredients obtained by adopting the technical scheme are sintered, the negative pressure of the air draft is reduced to-15.6 kPa, and the comprehensive fuel consumption is 50.3kg of standard coal.
Example 2:
the sintering and proportioning method for the return ore grading and layering distribution is characterized by comprising the following steps of:
(1) Grading return ores: screening the return ores with the particle size smaller than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size smaller than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing for later use;
(2) Conveying iron ore powder: flatly paving iron ore powder on a conveying belt through a blanking device, wherein the blanking amount is 700t/h;
(3) Conveying sintered coal and quicklime powder: in the process of forward running of the conveying belt, firstly, laying sintered coal on the conveying belt through a blanking device, wherein the blanking amount of the sintered coal is 5% of the blanking amount of iron ore powder; spreading quicklime powder on a conveying belt through a blanking device, wherein the blanking amount of the quicklime powder is 10% of the blanking amount of the iron ore powder;
(4) Conveying small-particle-size return ores: in the process of forward running of the conveying belt, the small-grain-size return ores are paved on the conveying belt through a blanking device, and the blanking amount of the small-grain-size return ores is 10% of the blanking amount of the iron ore powder;
(5) Mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotation speed and the water adding amount of the primary mixer and the secondary mixer are regulated, the total mixing time of the primary mixer and the secondary mixer is 5min, mixed material particles are obtained, and the moisture content of the mixed material particles is controlled to be 8.0%;
(6) Primary distribution of mixed material particles: the mixed material particles are paved on a sintering trolley through a distributing machine, wherein the paving height is 1/3 of the height of the sintering trolley;
(7) Cloth of large-particle-size return ores: paving the large-grain size return ores on the mixed material particles of the sintering trolley through a distributing machine, wherein the paving thickness is 8mm;
(8) Secondary distribution of mixed material particles: and (3) paving the mixed material particles on the large-particle-size return ores of the sintering trolley through a distributing machine until the sintering trolley is fully distributed.
Through detection, when the sintering ingredients obtained by adopting the technical scheme are sintered, the negative pressure of the air draft is reduced to-14.8 kPa, and the comprehensive fuel consumption is 50kg of standard coal.
Example 3:
the sintering and proportioning method for the return ore grading and layering distribution is characterized by comprising the following steps of:
(1) Grading return ores: screening the return ores with the particle size smaller than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size smaller than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing for later use;
(2) Conveying iron ore powder: flatly paving iron ore powder on a conveying belt through a blanking device, wherein the blanking amount is 650t/h;
(3) Conveying sintered coal and quicklime powder: in the process of forward running of the conveying belt, firstly, the quicklime powder is flatly paved on the conveying belt through a blanking device, and the blanking amount of the quicklime powder is 8% of the blanking amount of the iron ore powder; spreading the sintered coal on a conveying belt through a blanking device, wherein the blanking amount of the sintered coal is 4% of the blanking amount of the iron ore powder;
(4) Conveying small-particle-size return ores: in the process of forward running of the conveying belt, the small-grain-size return ores are paved on the conveying belt through a blanking device, and the blanking amount of the small-grain-size return ores is 8% of the blanking amount of the iron ore powder;
(5) Mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotation speed and the water adding amount of the primary mixer and the secondary mixer are regulated, the total mixing time of the primary mixer and the secondary mixer is 4.5min, mixed material particles are obtained, and the moisture content of the mixed material particles is controlled at 7.8%;
(6) Primary distribution of mixed material particles: the mixed material particles are paved on a sintering trolley through a distributing machine, wherein the paving height is 1/3 of the height of the sintering trolley;
(7) Cloth of large-particle-size return ores: paving the large-grain size return ores on the mixed material particles of the sintering trolley through a distributing machine, wherein the paving thickness is 7mm;
(8) Secondary distribution of mixed material particles: and (3) paving the mixed material particles on the large-particle-size return ores of the sintering trolley through a distributing machine until the sintering trolley is fully distributed.
Through detection, when the sintering ingredients obtained by adopting the technical scheme are sintered, the negative pressure of the air draft is reduced to-15.1 kPa, and the comprehensive fuel consumption is 50.1kg of standard coal.
Claims (1)
1. The sintering and proportioning method for the return ore grading and layering distribution is characterized by comprising the following steps of:
(1) Grading return ores: screening the return ores with the particle size smaller than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size smaller than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing for later use;
(2) Conveying iron ore powder: flatly paving iron ore powder on a conveying belt through a blanking device, wherein the blanking amount is 600-700 t/h;
(3) Conveying sintered coal and quicklime powder: in the process of the forward running of the conveying belt, spreading sintered coal and quicklime powder on the conveying belt through a blanking device respectively, wherein the blanking amount of the sintered coal is 3-5% of the blanking amount of the iron ore powder, and the blanking amount of the quicklime powder is 5-10% of the blanking amount of the iron ore powder;
(4) Conveying small-particle-size return ores: in the process of the forward running of the conveying belt, the small-grain-size return ores are paved on the conveying belt through a blanking device, and the blanking amount of the small-grain-size return ores is 5-10% of the blanking amount of the iron ore powder;
(5) Mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotation speed and the water adding amount of the primary mixer and the secondary mixer are regulated, the total mixing time of the primary mixer and the secondary mixer is 4-5 min, mixed material particles are obtained, and the moisture content of the mixed material particles is controlled to be 7.5-8.0%;
(6) Primary distribution of mixed material particles: the mixed material particles are paved on a sintering trolley through a distributing machine, wherein the paving height is 1/3 of the height of the sintering trolley;
(7) Cloth of large-particle-size return ores: paving the large-grain size return ores on the mixed material particles of the sintering trolley through a distributing machine, wherein the paving thickness is 5-8 mm;
(8) Secondary distribution of mixed material particles: and (3) paving the mixed material particles on the large-particle-size return ores of the sintering trolley through a distributing machine until the sintering trolley is fully distributed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210911701.5A CN115261615B (en) | 2022-07-30 | Sintering batching method for return ore grading layering distribution |
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| CN202210911701.5A CN115261615B (en) | 2022-07-30 | Sintering batching method for return ore grading layering distribution |
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| CN115261615B true CN115261615B (en) | 2024-06-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762456A (en) * | 1993-08-26 | 1995-03-07 | Nkk Corp | Production of sintered ore |
| JP2009097027A (en) * | 2007-10-15 | 2009-05-07 | Sumitomo Metal Ind Ltd | Method for producing sintered ore |
| CN104232883A (en) * | 2013-06-19 | 2014-12-24 | 宝山钢铁股份有限公司 | Mineral material usage method for increasing usage amount and production rate of sintered iron concentrate |
| CN108004392A (en) * | 2018-02-08 | 2018-05-08 | 山东钢铁股份有限公司 | A kind of agglomerating plant and technique for reducing sintering solid burnup |
| CN109868360A (en) * | 2019-04-18 | 2019-06-11 | 临沂玫德庚辰金属材料有限公司 | A kind of energy saving technique of sinter production |
| CN109913639A (en) * | 2019-01-31 | 2019-06-21 | 武汉钢铁有限公司 | The sintering method of layer-by-layer distribution after a kind of fuel pre-screening |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762456A (en) * | 1993-08-26 | 1995-03-07 | Nkk Corp | Production of sintered ore |
| JP2009097027A (en) * | 2007-10-15 | 2009-05-07 | Sumitomo Metal Ind Ltd | Method for producing sintered ore |
| CN104232883A (en) * | 2013-06-19 | 2014-12-24 | 宝山钢铁股份有限公司 | Mineral material usage method for increasing usage amount and production rate of sintered iron concentrate |
| CN108004392A (en) * | 2018-02-08 | 2018-05-08 | 山东钢铁股份有限公司 | A kind of agglomerating plant and technique for reducing sintering solid burnup |
| CN109913639A (en) * | 2019-01-31 | 2019-06-21 | 武汉钢铁有限公司 | The sintering method of layer-by-layer distribution after a kind of fuel pre-screening |
| CN109868360A (en) * | 2019-04-18 | 2019-06-11 | 临沂玫德庚辰金属材料有限公司 | A kind of energy saving technique of sinter production |
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