CN115261615A - Sintering and batching method for return fines graded layered distribution - Google Patents
Sintering and batching method for return fines graded layered distribution Download PDFInfo
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- CN115261615A CN115261615A CN202210911701.5A CN202210911701A CN115261615A CN 115261615 A CN115261615 A CN 115261615A CN 202210911701 A CN202210911701 A CN 202210911701A CN 115261615 A CN115261615 A CN 115261615A
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- 238000005245 sintering Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000009826 distribution Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 78
- 239000002245 particle Substances 0.000 claims abstract description 71
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 44
- 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
- 230000008569 process Effects 0.000 claims abstract description 21
- 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 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000007873 sieving Methods 0.000 claims description 6
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000009776 industrial production Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 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
- 230000000694 effects Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- -1 powdered ore Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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
- C22B1/16—Sintering; Agglomerating
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a sintering and batching method for return mine graded layered distribution, which is characterized by comprising the following steps of: classifying the return ores into small-particle-size return ores and large-particle-size return ores; conveying iron ore powder; conveying the sintered coal and the quicklime powder; conveying return ores with small grain sizes; mixing and granulating to obtain mixed material particles; primary distribution of the mixed material particles; distributing large-particle-size return ores; and (4) secondary material distribution of the mixed material particles until the sintering trolley is fully distributed. The method is simple to operate and convenient to process, the return ores with small particle sizes and other materials are graded in the mixer to be granulated to form mixed material particles with uniform particle sizes, and the mixed material particles and the return ores with large particle sizes are distributed on the sintering trolley layer by layer, so that the air permeability of a sintering burdening material layer is effectively improved, and the industrial production is realized.
Description
Technical Field
The invention relates to an improvement of a sintering and batching method, belongs to the technical field of sintering processes in the metallurgical industry, and particularly relates to a sintering and batching method for return ores graded layered distribution.
Background
The sintering process is a process of sintering and blending raw materials such as powdered ore, quicklime, sintering coal, return fines and the like, and generating blocky sintered ore with certain metallurgical performance through chemical reactions such as combustion and the like. The sintering burdening is the front-end flow of the sintering process, and different materials such as mineral powder, quicklime, sintering coal, return fines and the like are intensively mixed into a mixture and then are loaded into a sintering trolley once. The return fines are one of the important raw materials of the sintering burdening, and are sintered ores formed after sintering, particles with smaller particle size are obtained by sieving the sintered ores with a 5mm sieve, the sintered ores with the particle size smaller than 5mm can not enter the next process and can only be used as a raw material to return to the sintering burdening for recycling, and after the return fines are added into the sintering burdening, the air permeability in the sintering process can be increased, and the sintering efficiency is improved; through detection, in the conventional sintering and batching method for intensively mixing and loading into a sintering trolley at one time, the air draft negative pressure in the sintering process is-17 kPa, and the comprehensive fuel consumption is 52kg of standard coal. The disadvantages of the current sintering and batching method are that; if various materials in the sintering ingredients are not uniformly mixed, insufficient combustion can be caused, and the metallurgical performance is reduced; in the centralized mixing process of various materials, because the granularity of different materials is uneven, particularly return ores with large grain sizes cannot be granulated with iron ore powder in a mixer, the effect of the return ores cannot be fully exerted; therefore, how to fully exert the performance of the return ores through the sintering ingredients is a main research direction of the sintering ingredients at present.
Disclosure of Invention
The invention aims to provide the sintering batching method for the classified and layered distribution of the return ores, which is simple to operate and convenient to process, can classify the return ores with the grain diameter of less than 5mm, and distribute the classified and layered return ores on a sintering trolley, can realize industrial production and effectively improve the air permeability of a material layer.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the sintering and batching method for the return fine grading and layering distribution is characterized by comprising the following steps of:
(1) And return fine grading: sieving return ores with the particle size of less than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size of less than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing the return ores for later use;
(2) And conveying iron ore powder: iron ore powder is flatly paved on a conveying belt through a blanking device, and the blanking amount is 600-700 t/h;
(3) Conveying the sintered coal and the quicklime powder: in the forward running process of the conveying belt, paving sintered coal and quicklime powder on the conveying belt respectively through a blanking device, wherein the blanking amount of the sintered coal is 3-5% of that of the iron ore powder, and the blanking amount of the quicklime powder is 5-10% of that of the iron ore powder;
(4) And conveying small-particle-size return ores: in the process that the conveying belt moves forwards, small-particle-size return ores are flatly paved on the conveying belt through a blanking device, and the blanking amount of the small-particle-size return ores is 5-10% of that of iron ore powder;
(5) And mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotating speed and the water adding amount of the primary mixer and the secondary mixer are adjusted, the total mixing time of the primary mixer and the secondary mixer is 4-5 min, mixed material particles are obtained, and the water content of the mixed material particles is controlled to be 7.5-8.0%;
(6) And primary material distribution of the mixed material particles: laying the mixed material particles on a sintering trolley through a material distributor, wherein the laying height is 1/3 of the height of the sintering trolley;
(7) Distributing the large-particle-size return ores: paving the return ores with large particle sizes on the mixed material particles of the sintering trolley through a material distributor, wherein the paving thickness is 5-8 mm;
(8) And secondary distribution of the mixed material particles: and laying the mixed material particles on the large-particle-size return ores of the sintering trolley by a material distributor until the sintering trolley is fully distributed.
Through detection, when the sintering mixture obtained by adopting the technical scheme is sintered, the negative pressure of air draft is reduced to-15 kPa, the comprehensive fuel consumption is 50kg of standard coal, and the air permeability of a sintering mixture layer is obviously improved.
The invention has the beneficial effects that: the method has the advantages that the method is simple to operate and convenient to process, the return ores with small particle sizes and other materials are classified, granulation is completed in the mixer, mixed material particles with uniform particle sizes are formed, and the mixed material particles and the return ores with large particle sizes are distributed on the sintering trolley layer by layer, so that the air permeability of a sintering ingredient material layer is effectively improved, and industrial production is realized.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following specific examples.
Example 1:
a sintering and batching method for return fines graded layered distribution is characterized by comprising the following steps:
(1) And return fine grading: sieving return ores with the particle size of less than 5mm by using a 3mm sieve to obtain small-particle-size return ores with the particle size of less than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing the return ores for later use;
(2) Conveying iron ore powder: iron ore powder is flatly paved on a conveying belt through a blanking device, and the blanking amount is 600t/h;
(3) Conveying sintered coal and quicklime powder: in the forward running process of the conveying belt, respectively spreading the sintering coal and the quicklime powder on the conveying belt through a blanking device, wherein the blanking amount of the sintering coal is 3% of that of the iron ore powder, and the blanking amount of the quicklime powder is 5% of that of the iron ore powder;
(4) And conveying small-particle-size return ores: in the process that the conveying belt moves forwards, small-particle-size return ores are flatly paved on the conveying belt through a blanking device, and the blanking amount of the small-particle-size return ores is 5% of that of iron ore powder;
(5) And mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotating speed and the water adding amount of the primary mixer and the secondary mixer are adjusted, the total mixing time of the primary mixer and the secondary mixer is 4min, mixed material particles are obtained, and the water content of the mixed material particles is controlled to be 7.5%;
(6) And primary material distribution of the mixed material particles: laying the mixed material particles on a sintering trolley by a material distributor, wherein the laying height is 1/3 of the height of the sintering trolley;
(7) Distributing the large-particle-size return ores: paving the return ores with large particle sizes on the mixed material particles of the sintering trolley through a material distributor, wherein the paving thickness is 5mm;
(8) And secondary material distribution of the mixed material particles: and laying the mixed material particles on the large-particle-size return ores of the sintering trolley by a material distributor until the sintering trolley is fully distributed.
Through detection, when the sintering mixture obtained by adopting the technical scheme is sintered, the negative pressure of air draft is reduced to-15.6 kPa, and the comprehensive fuel consumption is 50.3kg of standard coal.
Example 2:
a sintering and batching method for return fines graded layered distribution is characterized by comprising the following steps:
(1) And return fine grading: sieving return ores with the particle size of less than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size of less than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing the return ores for later use;
(2) Conveying iron ore powder: iron ore powder is flatly laid on a conveying belt through a blanking device, and the blanking amount is 700t/h;
(3) Conveying the sintered coal and the quicklime powder: in the process that the conveying belt moves forwards, firstly, the sintered coal is flatly paved on the conveying belt through a blanking device, and the blanking amount of the sintered coal is 5% of that of the iron ore powder; spreading quicklime powder on a conveying belt through a feeding device, wherein the feeding amount of the quicklime powder is 10% of that of the iron ore powder;
(4) And conveying small-particle-size return ores: in the process that the conveying belt moves forwards, small-particle-size return ores are flatly paved on the conveying belt through a blanking device, and the blanking amount of the small-particle-size return ores is 10% of that of iron ore powder;
(5) And mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotating speed and the water adding amount of the primary mixer and the secondary mixer are adjusted, the total mixing time of the primary mixer and the secondary mixer is 5min, mixed material particles are obtained, and the water content of the mixed material particles is controlled to be 8.0%;
(6) And primary material distribution of the mixed material particles: laying the mixed material particles on a sintering trolley through a material distributor, wherein the laying height is 1/3 of the height of the sintering trolley;
(7) Distributing the large-particle-size return ores: paving the return ores with large particle sizes on the mixed material particles of the sintering trolley through a material distributor, wherein the paving thickness is 8mm;
(8) And secondary distribution of the mixed material particles: and laying the mixed material particles on the large-particle-size return ores of the sintering trolley by a material distributor until the sintering trolley is fully distributed.
Through detection, when the sintering mixture obtained by adopting the technical scheme is sintered, the negative pressure of air draft is reduced to-14.8 kPa, and the comprehensive fuel consumption is 50kg of standard coal.
Example 3:
a sintering and batching method for return fines graded layered distribution is characterized by comprising the following steps:
(1) And return fine grading: sieving return ores with the particle size of less than 5mm by a 3mm sieve to obtain small-particle-size return ores with the particle size of less than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing the return ores for later use;
(2) Conveying iron ore powder: iron ore powder is flatly paved on a conveying belt through a blanking device, and the blanking amount is 650t/h;
(3) Conveying the sintered coal and the quicklime powder: in the process that the conveying belt moves forwards, firstly, quicklime powder is flatly laid on the conveying belt through a blanking device, and the blanking amount of the quicklime powder is 8% of that of the iron ore powder; then, paving the sintering coal on a conveying belt through a blanking device, wherein the blanking amount of the sintering coal is 4% of that of the iron ore powder;
(4) And conveying small-particle-size return ores: in the process that the conveying belt moves forwards, small-particle-size return ores are flatly paved on the conveying belt through a blanking device, and the blanking amount of the small-particle-size return ores is 8% of that of iron ore powder;
(5) And mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotating speed and the water adding amount of the primary mixer and the secondary mixer are adjusted, the total mixing time of the primary mixer and the secondary mixer is 4.5min, mixed material particles are obtained, and the water content of the mixed material particles is controlled to be 7.8%;
(6) And primary material distribution of the mixed material particles: laying the mixed material particles on a sintering trolley through a material distributor, wherein the laying height is 1/3 of the height of the sintering trolley;
(7) And distributing the large-particle-size return ores: paving the return ores with large particle sizes on the mixed material particles of the sintering trolley through a material distributor, wherein the paving thickness is 7mm;
(8) And secondary distribution of the mixed material particles: and laying the mixed material particles on the large-particle-size return ores of the sintering trolley by a material distributor until the sintering trolley is fully distributed.
Through detection, when the sintering ingredient obtained by adopting the technical scheme is sintered, the negative pressure of air draft is reduced to-15.1 kPa, and the comprehensive fuel consumption is 50.1kg of standard coal.
Claims (1)
1. A sintering and batching method for return fines graded layered distribution is characterized by comprising the following steps:
(1) And return fine grading: sieving return ores with the particle size of less than 5mm by using a 3mm sieve to obtain small-particle-size return ores with the particle size of less than 3mm and large-particle-size return ores with the particle size of 3-5 mm, and respectively storing the return ores for later use;
(2) Conveying iron ore powder: iron ore powder is flatly paved on a conveying belt through a blanking device, and the blanking amount is 600-700 t/h;
(3) Conveying the sintered coal and the quicklime powder: in the forward running process of the conveying belt, paving sintered coal and quicklime powder on the conveying belt respectively through a blanking device, wherein the blanking amount of the sintered coal is 3-5% of that of the iron ore powder, and the blanking amount of the quicklime powder is 5-10% of that of the iron ore powder;
(4) And conveying small-particle-size return ores: in the process that the conveying belt moves forwards, small-particle-size return ores are flatly paved on the conveying belt through a blanking device, and the blanking amount of the small-particle-size return ores is 5-10% of that of iron ore powder;
(5) And mixing and granulating: the materials of the conveying belt sequentially enter a primary mixer and a secondary mixer, the rotating speed and the water adding amount of the primary mixer and the secondary mixer are adjusted, the total mixing time of the primary mixer and the secondary mixer is 4-5 min, mixed material particles are obtained, and the water content of the mixed material particles is controlled to be 7.5-8.0%;
(6) And primary material distribution of the mixed material particles: laying the mixed material particles on a sintering trolley through a material distributor, wherein the laying height is 1/3 of the height of the sintering trolley;
(7) Distributing the large-particle-size return ores: paving the return ores with large particle sizes on the mixed material particles of the sintering trolley through a material distributor, wherein the paving thickness is 5-8 mm;
(8) And secondary distribution of the mixed material particles: and laying the mixed material particles on the large-particle-size return ores of the sintering trolley by a material distributor until the sintering trolley is fully distributed.
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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 |
-
2022
- 2022-07-30 CN CN202210911701.5A patent/CN115261615B/en active Active
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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