CN115786611A - Low return mine ratio process for blast furnace ore tank - Google Patents
Low return mine ratio process for blast furnace ore tank Download PDFInfo
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- CN115786611A CN115786611A CN202211554970.7A CN202211554970A CN115786611A CN 115786611 A CN115786611 A CN 115786611A CN 202211554970 A CN202211554970 A CN 202211554970A CN 115786611 A CN115786611 A CN 115786611A
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- 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
Abstract
The invention discloses a low return ratio process of a blast furnace ore tank, which comprises the following steps: firstly, improving the vertical blanking type of all belt conveyor feed openings of a blast furnace ore tank into step-type material sliding; secondly, the stock bin is always kept at a high material level; then, improving the screening speed of the vibrating screen, finally, establishing a secondary screening recovery line, connecting a return end of the primary vibrating screen below the blast furnace tank to the secondary vibrating screen, and connecting the feeding of the primary vibrating screen to a feeding belt of the blast furnace through a metering belt; a feed opening of the secondary vibrating screen is connected to a return line through a belt; the oversize material of the secondary vibrating screen is connected to a buffer hopper; the buffer hopper is connected to a blast furnace feeding belt through a batching line. The low return ratio process of the blast furnace ore tank improves the utilization rate of raw fuel and realizes the reduction of the return ratio from 105 kg of original iron to 70 kg of original iron by taking measures of automatic screening control, reduction of material fall and the like, collecting and matching small-particle materials again for stone utilization after secondary screening is put into use.
Description
Technical Field
The invention particularly relates to a low return ratio process of a blast furnace ore tank, belonging to the technical field of blast furnace feeding systems.
Background
In the process of a blast furnace feeding system of an iron-making plant, in order to prevent mixed powder in sinter from entering a blast furnace to influence the air permeability in the blast furnace, the sinter is screened by a lower vibrating screen before entering the blast furnace, the sinter with the diameter larger than the screening aperture is taken as qualified sinter to enter the blast furnace through the next procedure, the sinter with the diameter smaller than the screening aperture is conveyed back to sinter for secondary processing, and the waste of sinter finished ore and the increase of processing cost are caused by high ore return rate; because the raw fuel used in blast furnace production needs to be collected and recovered again through a screening system, and the product ratio of the raw fuel is 184.6 yuan/ton higher than the recovery ratio of the raw fuel, in the prior art, the return ore ratio of smelting each ton of iron is about 105 kilograms, therefore, if the return powder rate can be reduced, the purposes of cost reduction and efficiency improvement can be achieved.
Disclosure of Invention
In order to solve the problems, the invention provides a low return-ore ratio process of a blast furnace ore tank, which reduces the return-ore ratio of the blast furnace and the production cost on the basis of ensuring a normal production process; meanwhile, the problems of environmental pollution, equipment loss, energy loss and the like caused by repeated material conveying are reduced.
The invention relates to a low return ratio process of a blast furnace ore tank, which comprises the following steps:
firstly, improving the vertical blanking type of the blanking ports of all belt conveyors of a blast furnace ore tank into step type material sliding;
secondly, adding a material level meter to an upper bin of the blast furnace ore tank, connecting the material level meter to a controller, connecting the controller with a feeder, detecting the material level of the bin by the controller through the material level meter, and enabling the bin to always keep a high material level through a feeder signal;
then, setting a gate on the vibrating screen hopper as an electric hydraulic gate, and connecting the gate to a controller; the screening rate is controlled by a control machine,
finally, establishing a secondary screening recovery line, connecting a return end of the primary vibrating screen below the blast furnace groove to a secondary vibrating screen, and connecting the oversize material of the primary vibrating screen to a blast furnace feeding belt through a metering belt; the aperture of the sieve pore of the secondary vibrating sieve is not less than one half of the aperture of the sieve pore of the primary vibrating sieve; a feed opening of the secondary vibrating screen is connected to a return line through a belt; the oversize material of the secondary vibrating screen is connected to a buffer hopper; the buffer hopper is connected to a blast furnace feeding belt through a batching line.
Further, the screening rate of the primary vibrating screen is related to the powder content of the powder entering the furnace, the screening rate of the primary vibrating screen is continuously increased, sampling detection is carried out, and when the powder content of the powder entering the furnace reaches 2%, the increase of the screening rate is stopped.
Further, the mixture ratio of the oversize material of the first-stage vibrating screen to the oversize material of the second-stage vibrating screen is 100.
Furthermore, the batching line comprises a material lifting belt, and the material lifting belt is provided with separation edges at intervals; surrounding edges are arranged on two sides of the material lifting belt; the lower end of the lifting belt is connected to the distribution hopper; the upper end of the material lifting belt is connected to the position right above the feeding belt of the blast furnace through a transition belt or a chute; a material port through which the material lifting belt and the separating edges penetrate is formed in the distribution hopper; the top of the distribution hopper is connected to the position right below the buffer hopper through a metering belt.
Furthermore, all belt feeder feed openings of the blast furnace ore tank comprise a belt transfer station feed opening and a tank feeding trolley feed opening.
The invention relates to a low return ratio process of a blast furnace ore tank, which comprises the following improvement processes:
(1) Automatic linkage control of screening rate: before improvement, raw fuel screening is based on manual on-site observation that the front three rows of screen teeth are exposed on the screen surface, the control of screened material flow is small, the phenomenon of transitional screening exists, the screening rate curve automatic control system is increased through research, the screening rate is reasonably controlled by combining the actual powder content in the furnace, and the screening powder return amount is reduced while the granularity of the fed material is ensured;
(2) At the integrated installation radar charge level indicator of feed bin, keep high material level feed: a material level meter is added to a bin on the tank, the material level of the bin is monitored in real time, and high-material-level feeding is kept, so that the crushing of the sinter due to large fall is reduced;
(3) Independently setting a blast furnace feeding belt: a sintered finished product bin and a transfer belt are cancelled, a blast furnace feeding belt is independently arranged, the direct supply rate of the sintered ore is improved by carding the feeding process, the transfer process of the sintered finished product bin is avoided, the damage and breakage caused by the fact that materials flow through the discharging process are reduced, the material blanking point is reduced, and the direct supply rate of the sintering is improved;
(4) And (3) secondary screening complementary energy utilization: and secondary screening is started, and the large-particle materials in the returned powder are recycled to the ore particle bin again, so that the materials are reasonably proportioned and utilized, and the utilization rate of the raw fuel is improved.
Compared with the prior art, the low ore return ratio process of the blast furnace ore tank further develops raw fuel feeding and screening processes on the basis of ensuring the normal production process by measures of automatic screening control, reduction of material fall and the like, so that the ore return ratio of the blast furnace is reduced; after secondary screening is put into use, the small-particle materials are collected again and used in a stone matching manner, so that the utilization rate of raw fuel is improved, and the ore return ratio is reduced from 105 kg to 70 kg of the original ton of iron.
Drawings
FIG. 1 is a schematic diagram of a secondary screening recovery line according to the present invention.
Figure 2 is a graph comparing the screening rate to return fines ratio for the present invention.
Fig. 3 is a comparison chart of the storage level of the storage bin and the return fines ratio.
Fig. 4 is a comparison chart of the ratio of the front and the rear of the feed opening before modification and the return ores.
Detailed Description
The invention relates to a low return ratio process of a blast furnace ore tank, which comprises the following steps:
firstly, improving the vertical blanking type of all belt conveyor feed openings of a blast furnace ore tank into step-type material sliding;
secondly, adding a material level meter to an upper bin of the blast furnace ore tank, connecting the material level meter to a controller, connecting the controller with a feeder, detecting the material level of the bin by the controller through the material level meter, and enabling the bin to always keep a high material level through a feeder signal; the high material level of the feeding bin of the trough is maintained, so that the material breaking phenomenon caused by large fall in the feeding period is reduced, the vertical blanking type is changed into the downward sliding type for discharging, the impact crushing of the material is reduced, and the powder rate is reduced;
then, setting a gate on the vibrating screen hopper as an electric hydraulic gate and connecting the gate to a controller; the screening rate is controlled by a control machine,
finally, establishing a secondary screening recovery line, connecting a return end of the primary vibrating screen below the blast furnace tank to a secondary vibrating screen, and connecting the oversize material of the primary vibrating screen to a blast furnace feeding belt through a metering belt; the aperture of the sieve pore of the second-stage vibrating sieve is not less than one half of the aperture of the sieve pore of the first-stage vibrating sieve; the feed opening of the secondary vibrating screen is connected to the return line through a belt; the oversize material of the secondary vibrating screen is connected to a buffer hopper; the buffer hopper is connected to a blast furnace feeding belt through a batching line.
The screening speed of the first-stage vibrating screen is related to the powder content of the powder fed into the furnace, the screening speed of the first-stage vibrating screen is continuously increased, sampling detection is carried out, and when the powder content of the powder fed into the furnace reaches 2%, the increase of the screening speed is stopped; the mixture ratio of the oversize material of the first-stage vibrating screen to the oversize material of the second-stage vibrating screen is (100) to (5), and the air permeability in the blast furnace can be ensured, the ore return ratio is reduced, and the flow curve of the gas flow in the blast furnace can be adjusted through the matching of the first-stage screening material and the second-stage screening material.
As shown in fig. 1, the batching line comprises a lifting belt 1, and separation ribs 2 are arranged on the lifting belt 1 at intervals; surrounding edges 3 are arranged on two sides of the material lifting belt 1; the lower end of the lifting belt 1 is connected to a distribution hopper 4; the upper end of the material lifting belt 1 is connected to the position right above a blast furnace feeding belt through a transition belt or a chute 5; a material port 6 for a material lifting belt and a separation edge to pass through is arranged on the distribution hopper 4; the top of the distribution hopper 4 is connected to a buffer hopper 8 through a metering belt 7. All belt feeder feed openings of the blast furnace ore tank comprise a belt transfer station feed opening and a tank feeding trolley feed opening.
Example 1:
the invention relates to a low return ratio process of a blast furnace ore tank, which comprises the following steps:
as shown in fig. 2, which is the screening rate compared to the return ore ratio; by tracing experimental data, on the premise of the same particle size of the raw fuel, the screening speed of the vibrating screen is increased from 70t/h to 100t/h, and whether the experimental return ore ratio changes or not is determined; in the experiment, sintered ore, pellet ore, australian lump ore and the like are respectively adopted, the screening speed is improved through the experiment on the premise that the original fuel granularity is the same, and the change of the powder content and the return ore amount in the furnace is observed;
the first stage is as follows: the sieving rate is 80t/h, the powder content in the furnace is 0.57 percent, and the return fines ratio is 101.7kg/t;
and a second stage: the powder content in the furnace is 1.08 percent at the screening speed of 90t/h, and the return fines ratio is 95.2kg/t;
and a third stage: the powder-containing rate of the fed ore in the furnace is 1.75 percent at the screening rate of 100t/h, and the return ore ratio is 90.3kg/t;
through comparison experiment results, when the screening rate is increased from 80t/h to 100t/h, the numerical value of the powder content of the raw fuel in the blast furnace is not greatly changed, and the requirement that the powder content of the raw fuel in the blast furnace is not more than 2 percent is not exceeded;
when the screening speed is 80t/h, the ore ratio is 101.7kg/t, which is reduced by 3.9kg/t before the experiment; when the screening speed is 90t/h, the ore ratio is 95.2kg/t, which is 10.4kg/t lower than that before the experiment; when the screening speed is 100t/h, the ore ratio is 90.3kg/t, which is 15.4kg/t lower than that before the experiment;
therefore, when the particle size of the raw fuel is the same, by improving the screening speed and combining the reasonable control of the actual powder content in the blast furnace, the return loss caused by excessive screening can be reduced, and the effect of reducing the return ratio of the blast furnace is better;
as shown in fig. 3, it is the bin level height to return fines ratio; on the premise of the same quality of raw fuel, the feeding time on the tank is adjusted to test whether the return ore ratio changes; during testing, sintered ore and pellet ore are adopted; material is knocked out at high, middle and low material positions of the storage bin through an experimental groove, and the change of the return ore ratio is observed;
the first stage is as follows: when the material is beaten, the material level of the storage bin is 20 percent, and the return ore ratio is 90kg/t;
and a second stage: when the material is beaten, the material level of the storage bin is 30 percent, and the return ore ratio is 87kg/t;
and a third stage: when in material beating, the material level of the storage bin is 40 percent, and the return ore ratio is 84kg/t;
a fourth stage: when in material beating, the material level of the storage bin is 50 percent, and the return ore ratio is 79kg/t.
Through comparison of experimental results, when the particle sizes of the raw fuel are the same, the phenomenon of material breakage caused by large fall in the feeding period is reduced by keeping high-material-level feeding of a feeding bin of the tank, the high-material-level feeding rate and the low-material-level feeding rate are reduced, and the return ore rate is reduced by 11kg/t under the condition of not influencing the production flow;
as shown in fig. 4, the comparison between the feed opening before and after modification and the ore return ratio is performed, and the change condition of the ore return ratio is tested by modifying the feed opening of the transfer station and recycling the ore return on the premise of the same quality of the raw fuel; through experiments, the feed openings of all belt conveyors are transformed from a vertical blanking type to a stepped material sliding type, so that impact crushing of materials is reduced, and the powder rate of raw fuel is reduced; a secondary screening recycling system is put into use, so that the amount of returned ore is reduced;
the first stage is as follows: the ore return ratio of a feed opening of the belt transfer station is improved to be 78kg/t;
and a second stage: the ore return ratio of a feed opening of the knockout trolley on the improved groove is 77kg/t;
and a third stage: the return ore feeding ratio of the return ore secondary screening system is 68.8kg/t.
The feed openings of all belt conveyors and the material beating trolleys on the grooves are modified from a vertical blanking type to a step material sliding type, the ore return ratio is reduced to 77kg/t from 79kg/t, the influence on the reduction of the ore return ratio is small through the modification of the feed openings when the original fuel granularity is the same, and the ore return ratio is reduced to 68.8kg/t from 77kg/t after the secondary screening is put into use; through comparison of experimental results, the feed opening modification and return ore secondary screening recovery input return ore ratio is reduced by 10.2kg/t; after the return fines are screened for the second time and recycled, the reduction effect of the return fines ratio is obvious.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, characteristics and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (5)
1. A low return-ore ratio process for a blast furnace ore tank is characterized by comprising the following steps: the process specifically comprises the following steps:
firstly, improving the vertical blanking type of all belt conveyor feed openings of a blast furnace ore tank into step-type material sliding;
secondly, adding a material level meter to an upper bin of the blast furnace ore tank, connecting the material level meter to a controller, connecting the controller with a feeder, detecting the material level of the bin by the controller through the material level meter, and enabling the bin to always keep a high material level through a feeder signal;
then, setting a gate on the vibrating screen hopper as an electric hydraulic gate and connecting the gate to a controller; the screening rate is controlled by a control machine,
finally, establishing a secondary screening recovery line, connecting a return end of the primary vibrating screen below the blast furnace groove to a secondary vibrating screen, and connecting the oversize material of the primary vibrating screen to a blast furnace feeding belt through a metering belt; the aperture of the sieve pore of the secondary vibrating sieve is not less than one half of the aperture of the sieve pore of the primary vibrating sieve; the feed opening of the secondary vibrating screen is connected to the return line through a belt; the oversize material of the secondary vibrating screen is connected to a buffer hopper; the buffer hopper is connected to a blast furnace feeding belt through a batching line.
2. The blast furnace launder low return ratio process according to claim 1, characterised in that: and when the powder content of the powder fed into the furnace is 2%, stopping increasing the screening speed by continuously increasing the screening speed of the first-stage vibrating screen and sampling and detecting.
3. The blast furnace launder low return ratio process according to claim 1, characterised in that: the mixture ratio of the oversize material of the first-stage vibrating screen to the oversize material of the second-stage vibrating screen is 100 to 5.
4. The blast furnace launder low return ratio process according to claim 1, characterised in that: the batching line comprises a material lifting belt, and the material lifting belt is provided with separating ribs at intervals; surrounding edges are arranged on two sides of the material lifting belt; the lower end of the lifting belt is connected to a distribution hopper; the upper end of the material lifting belt is connected to the position right above the feeding belt of the blast furnace through a transition belt or a chute; a material port through which the material lifting belt and the separating edges penetrate is formed in the distribution hopper; the top of the distribution hopper is connected to the position right below the buffer hopper through a metering belt.
5. The blast furnace launder low return ratio process according to claim 1, characterised in that: all belt feeder feed openings of the blast furnace ore tank comprise a belt transfer station feed opening and a tank feeding trolley feed opening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211554970.7A CN115786611A (en) | 2022-12-06 | 2022-12-06 | Low return mine ratio process for blast furnace ore tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211554970.7A CN115786611A (en) | 2022-12-06 | 2022-12-06 | Low return mine ratio process for blast furnace ore tank |
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| CN115786611A true CN115786611A (en) | 2023-03-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009030112A (en) * | 2007-07-27 | 2009-02-12 | Jfe Steel Kk | Method for producing ore raw material for blast furnace |
| CN202498022U (en) * | 2012-03-15 | 2012-10-24 | 四川省达州钢铁集团有限责任公司 | System for screening and recycling blast furnace return ore |
| CN210207629U (en) * | 2019-05-17 | 2020-03-31 | 山东莱钢永锋钢铁有限公司 | Automatic secondary screening system for return ores |
| CN112474292A (en) * | 2020-11-27 | 2021-03-12 | 陕西龙门钢铁有限责任公司 | Device for secondary screening of blast furnace return ores in steel plant |
-
2022
- 2022-12-06 CN CN202211554970.7A patent/CN115786611A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009030112A (en) * | 2007-07-27 | 2009-02-12 | Jfe Steel Kk | Method for producing ore raw material for blast furnace |
| CN202498022U (en) * | 2012-03-15 | 2012-10-24 | 四川省达州钢铁集团有限责任公司 | System for screening and recycling blast furnace return ore |
| CN210207629U (en) * | 2019-05-17 | 2020-03-31 | 山东莱钢永锋钢铁有限公司 | Automatic secondary screening system for return ores |
| CN112474292A (en) * | 2020-11-27 | 2021-03-12 | 陕西龙门钢铁有限责任公司 | Device for secondary screening of blast furnace return ores in steel plant |
Non-Patent Citations (3)
| Title |
|---|
| 何木光;蒋大军;杜斯宏;宋剑;李程;易凯;: "降低高钛型钒钛精矿烧结返矿率实践", 冶金丛刊, no. 01, pages 38 - 42 * |
| 毛林猛;付云山;陈军;王福才;周林;普欣荣;移小义;: "红钢降低高炉槽下返矿率的实践", 钢铁研究, no. 03, pages 45 - 49 * |
| 高海潮等: "《马钢炼铁技术与管理》", 冶金工业出版社, pages: 339 - 343 * |
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