CN109536701B - Device and method for reducing powder content of lump ore - Google Patents
Device and method for reducing powder content of lump ore Download PDFInfo
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- CN109536701B CN109536701B CN201710861964.9A CN201710861964A CN109536701B CN 109536701 B CN109536701 B CN 109536701B CN 201710861964 A CN201710861964 A CN 201710861964A CN 109536701 B CN109536701 B CN 109536701B
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- 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
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- 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
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Abstract
The invention relates to a device and a method for reducing the powder content of lump ore, which mainly solve the technical problems of high powder content and difficult screening of the lump ore for blast furnace ironmaking in the prior art. The invention relates to a device for reducing the powder content of lump ore, which comprises a sintering machine, an air box of the sintering machine, a sintering flue gas pipeline, a lump ore belt conveyor and a lump ore bin, and is characterized by further comprising an induced draft fan, a baking furnace, a flue gas hood, a vibrating screen, a screen underflow belt conveyor, a dust removal belt conveyor and a feeding belt conveyor, wherein the flue gas hood is communicated with the sintering flue gas pipeline; the air outlet pipeline of the draught fan and the baking furnace is communicated through a sintering flue gas pipeline, an electrostatic dust collector is arranged on the sintering flue gas pipeline between the air outlet pipeline of the draught fan and the baking furnace, and an electric gate valve is arranged on the sintering flue gas pipeline between the air outlet pipeline of the sintering machine air box and the air inlet pipeline of the baking furnace. The device has low manufacturing and operating cost.
Description
Technical Field
The invention relates to a blast furnace burden processing device, in particular to a device and a method for reducing the powder content of lump ore, and belongs to the technical field of blast furnace iron making.
Background
The lump ore has high iron grade, can be directly put into a blast furnace for smelting in ferrous metallurgy, has far lower price than pellet ore, and is wider in application; however, the moisture content of the lump ore is large, so that powder is easy to adhere to the surface of the lump ore and is difficult to screen cleanly, particularly in rainy days and winter, the problem that the powder content of the lump ore is too high commonly exists, the powder adheres to a screen and blocks screen holes, the lump ore is difficult to screen, the air permeability of a blast furnace is affected, and the operation of the blast furnace is difficult, so that the use ratio of the lump ore in the production of the blast furnace is limited.
For the problem of high powder content of lump ore, most solutions are to strengthen screening, use multiple sets of screening equipment, and have low efficiency; the lump ore is elutriated by water, but the problems of high humidity and water pollution of the lump ore are caused; drying treatment of lump ore has also been studied, for example, chinese patent application publication No. CN102021314A discloses a method for directly spreading lump ore on the surface of hot sinter ore by using the waste heat of a sinter ore cooler to heat the hot sinter ore, which aims to increase the temperature of charging material and ensure that the temperature of the furnace top is 100-170 ℃; the drying mode can cause that the lump ore and the sintered ore are mixed and then are used for detecting the chemical components of the sintered ore, the chemical components are greatly influenced by the sampling uniformity, the detected alkalinity fluctuates along with the sampling uniformity, and troubles are caused for the blast furnace batching.
Disclosure of Invention
The invention aims to provide a device and a method for reducing the powder content of lump ore, which mainly solve the technical problems of high powder content and difficult screening of the lump ore for blast furnace iron making in the prior art.
The technical scheme adopted by the invention is that the device for reducing the powder content of the lump ore comprises a sintering machine, a sintering machine air box, a sintering flue gas pipeline, a lump ore belt conveyor and a lump ore bin and is characterized by further comprising an induced draft fan, a baking furnace, a flue gas hood, a vibrating screen, a screen underflow belt conveyor, a dedusting belt conveyor and a feeding belt conveyor, wherein the flue gas hood is arranged on the sintering flue gas pipeline right above a position 1/5-3/10 away from the sintering machine head in the length direction of the sintering machine and is communicated with the sintering flue gas pipeline; the baking furnace is provided with an air inlet pipeline and an air outlet pipeline, the air outlet pipeline of the draught fan and the baking furnace are communicated through a sintering flue gas pipeline, an electrostatic dust collector is arranged on the sintering flue gas pipeline between the draught fan and the air outlet pipeline of the baking furnace, a sintering machine air box is arranged below the sintering machine, the air outlet pipeline of the sintering machine air box and the air inlet pipeline of the baking furnace are communicated through the sintering flue gas pipeline, an electric gate valve is arranged on the sintering flue gas pipeline between the air outlet pipeline of the sintering machine air box and the air inlet pipeline of the baking furnace, an upper sealing valve is arranged in the baking, the lower sealing valve and the bottom sealing valve are arranged on the lower portion of the baking furnace, a chute is arranged on the lower portion of the baking furnace, a feeding belt conveyor is arranged above the baking furnace, a vibrating screen is arranged under the chute of the baking furnace, a lump ore belt conveyor and an undersize belt conveyor are arranged below the vibrating screen, a dust removal belt conveyor is arranged above the side of the vibrating screen, and a lump ore bin is arranged below the lump ore belt conveyor.
Further, the longitudinal section of the flue gas hood is trapezoidal, the width of the cross section of the bottom of the flue gas hood is the same as the width of a trolley of the sintering machine, the area of the cross section of the bottom of the flue gas hood is 2-4 times of the area of the cross section of an air box of the sintering machine at the position where the extracted sintering flue gas is located, the flue gas hood is installed on a sintering flue gas pipeline which is located right above the position where the length direction of the sintering machine is far away from the nose 1/5-3/10 of the sintering machine, if the sintering machine totally has 20 air boxes, the flue gas hood is located above the.
Further, when the induced draft fan extracts the sintering flue gas to bake lump ores in the baking furnace, the extracted sintering flue gas is the sintering flue gas with the temperature of more than 300 ℃ in the sintering machine air box, the position of the extracted sintering flue gas is 7/10-4/5 away from the sintering machine head in the length direction of the sintering machine, for example, the flue gas of No. 15 air boxes is extracted from 20 air boxes of the sintering machine in total, and the air boxes of the sintering machine are the sintering machine air boxes arranged in the position of 7/10-4/5 away from the sintering machine head in the length direction of the sintering machine, so that the effect is good.
Furthermore, the baking oven is a vertical oven with a circular section or a square section, and the included angle between the axial line of the air inlet pipeline and the axial line of the air outlet pipeline of the baking oven and the cross section of the baking oven is 10-30 degrees, so that the effect is good.
Furthermore, the aperture of the vibrating screen is 5mm multiplied by 5mm, and the effect is good.
The method for reducing the powder content of the lump ore by using the device comprises the following steps:
1) opening an upper sealing valve in the baking oven, operating a feeding belt conveyor to convey a certain amount of lump ore to an oven cavity between the upper sealing valve and a lower sealing valve in the baking oven, then opening the lower sealing valve in the baking oven to enable the lump ore to fall into a hearth of the baking oven, and closing the upper sealing valve and the lower sealing valve in the baking oven;
2) opening an electric gate valve arranged in a sintering flue gas pipeline between a sintering machine air box and a baking furnace, starting an electrostatic dust collector and an induced draft fan, pumping out high-temperature flue gas in the sintering machine air box by the induced draft fan, conveying the high-temperature flue gas to the baking furnace through the sintering flue gas pipeline, and baking lump ore in a hearth of the baking furnace for 20-30 min; when the lump ore is baked, the next baking material preparation is carried out, an upper sealing valve in the baking furnace is opened, and a feeding belt conveyor is operated to convey a certain amount of lump ore to a furnace chamber between the upper sealing valve and a lower sealing valve in the baking furnace, so that the next baking material preparation is completed;
3) controlling the vibrating screen to enter a working mode, opening a bottom sealing valve of the baking furnace, enabling dried lump ores to fall into the vibrating screen through a chute of the baking furnace for screening, closing the bottom sealing valve of the baking furnace after all the lump ores in the baking furnace fall into the vibrating screen, and controlling a screen underflow belt conveyor to transfer screen underflow of the vibrating screen to a sintering batching chamber for sintering batching; controlling a lump ore belt conveyor to transfer the screened lump ore to a lump ore bin for later use;
4) controlling an electrostatic dust collector to discharge dust, and controlling a dust removal belt conveyor to convey the dust removed from the electrostatic dust collector to a sintering batching chamber for later use;
5) repeating the steps 1) to 4) to carry out lump ore baking continuous operation;
6) when the lump ore baking is stopped, an electric gate valve arranged on a sintering flue gas pipeline between an air outlet pipeline of a sintering machine air box and an air inlet pipeline of a baking furnace is closed, and then the vibrating screen, the lump ore belt conveyor, the undersize belt conveyor, the induced draft fan, the electrostatic dust collector and the dust removal belt conveyor are stopped.
Further, in the step 3), the lump ore in the lump ore bin is weighed and then transferred to the finished sintered ore belt, and the weighed lump ore and the sintered ore on the finished sintered ore belt are transferred to the blast furnace iron ore bin together.
Further, in the step 4), the fly ash conveyed to the sintering batching chamber is used as the sintering batching.
Based on the following research, the applicant finds that the temperature of the waste gas in the sintering large flue is 110-150 ℃, the waste gas is cooled to 80-130 ℃ through electric precipitation, the waste gas is further cooled to about 80 ℃ through a desulfurization and denitrification process, and then the waste gas is directly discharged, and the heat contained in the waste gas is not effectively utilized, so that the energy is wasted. The temperature of the flue gas fluctuates regularly in the length direction of the sintering machine, and the air box at the position from the machine head 7/10-4/5 in the length direction of the sintering machine is a part with higher flue gas temperature and can reach 300-500 ℃.
The method comprises the steps that a draught fan in a sintering flue gas circulating system is used for extracting high-temperature flue gas in an air box of a sintering machine, the sintering high-temperature flue gas is conveyed to a baking oven through a sintering flue gas pipeline to serve as a heat source for baking lump ore in the baking oven, the lump ore in the baking oven is baked, continuous feeding and discharging of the lump ore are achieved through an upper sealing valve and a lower sealing valve of the baking oven, the baked lump ore is screened and then transferred to a lump ore storage bin, and the lump ore and the sintering ore are transferred to a blast furnace; the dedusting ash and the undersize (powder) of the lump ore are respectively transferred to a sintering proportioning chamber to be used as sintering raw materials for reuse.
In the step 2), when the induced draft fan works, the high-temperature flue gas is dedusted by the electrostatic precipitator arranged between the induced draft fan and the baking furnace, the dedusted high-temperature flue gas is conveyed to the flue gas hood right above the sintering machine trolley by the sintering flue gas pipeline, and in the air draft negative pressure sintering process of the sintering machine, the dedusted high-temperature flue gas is sucked into the sinter bed again through the flue gas hood, so that gas with a certain temperature is provided for the sintering process, and the energy consumption of the sintering process is reduced.
The invention fully utilizes the waste heat of the sintering flue gas and reduces the drying cost of the lump ore.
Compared with the prior art, the technical scheme has the following positive effects: 1. the high-temperature waste heat in the sintering flue gas is utilized to dry the wet lump ore containing powder, so that the powder adhesion is favorably reduced, the screening efficiency is improved, and the powder content of the lump ore is reduced. 2. After being screened, the blast furnace lump ore and the sintering ore enter the blast furnace together, and the lump ore is screened again and falls down during the transportation process, so that the powder content of the lump ore is further reduced. 3. The sintering flue gas is recycled while the lump ore is baked, the upper air temperature of the front section of the sintering machine is increased, the sintering heat supply can be increased, and the sintering production solid consumption is reduced. 4. The sintering flue gas is recycled, the flue gas amount discharged by the sintering machine is reduced, the pollutant discharge is reduced, the pressure of a sintering flue gas purification system is reduced, and the pollutant treatment cost is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
The notation in the figure is: 1-a flue gas hood; 2-sintering machine; 3-sintering machine bellows; 4-electric gate valve; 5-upper sealing valve; 6-lower sealing valve; 7-bottom sealing valve; 8-chute; 9-lump ore storage bins; 10-lump ore belt conveyor; 11-a vibrating screen; 12-undersize belt conveyer; 13-a dust removal belt conveyor; 14-a draught fan; 15-an electrostatic precipitator; 16-a baking oven; 17-a feeding belt conveyor; 18-sintering flue gas pipeline.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Referring to fig. 1, the device for reducing the powder content of lump ore comprises a sintering machine 2, a sintering machine air box 3, a sintering flue gas pipeline 18, a lump ore belt conveyor 10 and a lump ore bin 9, and is characterized by further comprising an induced draft fan 14, a baking furnace 16, a flue gas cover 1, a vibrating screen 11, a screen underflow belt conveyor 12, a dedusting belt conveyor 13 and a feeding belt conveyor 17, wherein the flue gas cover 1 is arranged on the sintering flue gas pipeline 18 right above a position 1/4, which is away from a sintering machine head, in the length direction of the sintering machine, and the flue gas cover 1 is communicated with the sintering flue gas pipeline 18; the baking furnace 16 is provided with an air inlet pipeline and an air outlet pipeline, an induced draft fan 14 is communicated with the air outlet pipeline of the baking furnace 16 through a sintering flue gas pipeline, an electrostatic dust collector 15 is arranged on the sintering flue gas pipeline between the induced draft fan 14 and the air outlet pipeline of the baking furnace 16, a sintering machine air box 3 is arranged below the sintering machine 2, the air outlet pipeline of the sintering machine air box 3 arranged at the position which is away from a sintering machine head 3/4 in the length direction of the sintering machine is communicated with the air inlet pipeline of the baking furnace 16 through the sintering flue gas pipeline, an electric gate valve 4 is arranged on the sintering flue gas pipeline between the air outlet pipeline of the sintering machine air box 3 and the air inlet pipeline of the baking furnace 16, an upper sealing valve 5, a lower sealing valve 6 and a bottom sealing valve 7 are arranged in the baking furnace 16, a chute 8 is arranged at the lower part of the baking furnace, an ore lump belt conveyor 10 and an undersize belt conveyor 12 are arranged below the vibrating screen 11, a dust removal belt conveyor 13 is arranged above the vibrating screen 11, and an ore lump bin 9 is arranged below the ore lump belt conveyor 10.
The method for reducing the powder content of the lump ore by using the device comprises the following steps:
1) opening an upper sealing valve 5 in the baking oven 16, operating a feeding belt conveyor 17 to convey a certain amount of lump ore to an oven cavity between the upper sealing valve 5 and a lower sealing valve 6 in the baking oven 16, then opening the lower sealing valve 6 in the baking oven 16 to enable the lump ore to fall into a hearth of the baking oven 16, and closing the upper sealing valve 5 and the lower sealing valve 6 in the baking oven 16;
2) opening an electric gate valve 4 arranged in a sintering flue gas pipeline between a sintering machine air box 3 and a baking furnace 16, starting an electrostatic dust collector 15 and an induced draft fan 14, pumping high-temperature flue gas in the sintering machine air box 3 out by the induced draft fan 14, conveying the high-temperature flue gas to the baking furnace 16 through the sintering flue gas pipeline, and baking lump ore in a hearth of the baking furnace for 30 min; when the lump ore is roasted, the material is roasted next time, the upper sealing valve 5 in the roasting furnace 16 is opened, the feeding belt conveyor 17 is operated to convey a certain amount of lump ore to a furnace chamber between the upper sealing valve 5 and the lower sealing valve 6 in the roasting furnace 16, and the material preparation for the next roasting is finished;
3) controlling a vibrating screen 11 to enter a working mode, opening a bottom sealing valve 7 of a baking oven 16, enabling dried lump ores to fall into the vibrating screen 11 through a baking oven chute 8 for screening, closing the bottom sealing valve 7 of the baking oven 16 after all the lump ores in the baking oven 16 fall into the vibrating screen 11, and controlling an undersize belt conveyor 12 to transfer undersize materials of the vibrating screen 11 to a sintering batching chamber for sintering batching; operating a lump ore belt conveyor 10 to transfer the screened lump ore to a lump ore bin 9 for later use;
4) controlling the electrostatic dust collector 15 to discharge dust, and controlling the dust removal belt conveyor 13 to convey the dust removed from the electrostatic dust collector 15 to the sintering batching chamber for later use;
5) repeating the steps 1) to 4) to carry out lump ore baking continuous operation;
6) when the lump ore baking is stopped, the electric gate valve 4 arranged on the sintering flue gas pipeline between the air outlet pipeline of the sintering machine air box 3 and the air inlet pipeline of the baking furnace is firstly closed, and then the vibrating screen 11, the lump ore belt conveyor 10, the undersize belt conveyor 12, the induced draft fan 14, the electrostatic dust collector 15 and the dust removal belt conveyor 13 are stopped to operate.
Example 1, taking a sintering machine in a certain steel mill as an example, the induced draft fan used in the system is SJ1800 type, the electrostatic dust collector is HHD-30/3/1 type, the belt conveyor is SJ20 type, the vibrating screen is GFS type, the electric gate valve is ZQ type, all the induced draft fans, the belt conveyor, the vibrating screen and the electric gate valve are free equipment and are made of 304 stainless steel, and a flue gas hood, a baking furnace, a pipeline and a lump ore storage bin are made of the stainless steel.
The sintering machine has 22 bellows, then the bellows at 7/10-4/5, namely the flue gas of No. 16 and No. 17 bellows, is extracted for use, and the flue gas temperature is about 320 ℃; the area of the bellows was 1.5m2The width of the trolley is 4m, and the area of the smoke cover is 6m2The width of the device is 4m, the length of the device is 1.5m, the amount of lump ore used by a blast furnace matched with a sintering machine is 15.6t/h, the powder content of the lump ore is 20%, a baking furnace is designed to bake 9.8t lump ore every 30min, the included angle between the axial lines of an air inlet pipeline and an air outlet pipeline of the baking furnace and the cross section of the baking furnace is 30 degrees, and the aperture of a vibrating screen is × 5mm, and the device is automatically controlled by a computer system.
A method for reducing the powder content of lump ore comprises the following steps:
opening the upper sealing valve 5, closing the lower sealing valve 6 and the bottom sealing valve 7, loading 9.8 tons of powder-containing lump ore by the feeding belt conveyor 17, closing the upper sealing valve 5, simultaneously opening the lower sealing valve 6, loading the lump ore in the hearth, closing the lower sealing valve 6, and completing the loading process;
operating an electrostatic dust collector 15 and an induced draft fan 14, opening an electric gate valve 4, leading out high-temperature flue gas to pass through the hearth lump ore and baking the lump ore, and controlling the time from feeding to baking to be 30 min; opening the upper sealing valve 5 while baking, then loading 9.8 tons of powder-containing lump ore, closing the upper sealing valve 5 after loading, and waiting for baking to finish; flue gas pumped by the draught fan 14 returns to 1/5-3/10 positions of the sintering machine, namely a flue gas hood 2 at the upper part of the trolley corresponding to No. 5-7 air boxes;
after the baking time is finished, the temperature of the lump ore reaches more than 120 ℃, the vibrating screen 11, the undersize belt conveyor 12 and the lump ore belt conveyor 10 are operated, when the dust collector has excessive accumulated dust and the dust is discharged, the dust removing belt conveyor 13 is increased, the bottom sealing valve 7 is opened, the dried lump ore is quickly discharged, the bottom sealing valve 7 is closed, the lower sealing valve 6 is opened, and new lump ore is filled for baking; the lump ore powder and the dust removed ash which are sieved by the vibrating screen 11 and are smaller than 5mm return to the sintering batching chamber respectively to participate in batching, and the dried lump ore which is larger than 5mm enters the lump ore bin 9 firstly, then enters a sinter finished product belt after weighing and metering, and enters the blast furnace together with the sinter.
Through baking, screening and transferring into the blast furnace, the powder content of the blast furnace lump ore can be reduced by more than 20%, the air permeability of the blast furnace is greatly improved, and the improvement of the blast furnace operation technical index is obviously promoted.
In addition to the above embodiments, other embodiments are also possible in the present technical solution. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A device for reducing the powder content of lump ore comprises a sintering machine, a sintering machine air box, a sintering flue gas pipeline, a lump ore belt conveyor and a lump ore bin, and is characterized by further comprising an induced draft fan, a baking furnace, a flue gas hood, a vibrating screen, a screen underflow belt conveyor, a dust removal belt conveyor and a feeding belt conveyor, wherein the flue gas hood is arranged on the sintering flue gas pipeline right above a 1/5-3/10 part of a sintering machine head in the length direction of the sintering machine and is communicated with the sintering flue gas pipeline; the baking furnace is provided with an air inlet pipeline and an air outlet pipeline, the air outlet pipeline of the draught fan and the baking furnace are communicated through a sintering flue gas pipeline, an electrostatic dust collector is arranged on the sintering flue gas pipeline between the draught fan and the air outlet pipeline of the baking furnace, a sintering machine air box is arranged below the sintering machine, the air outlet pipeline of the sintering machine air box and the air inlet pipeline of the baking furnace are communicated through the sintering flue gas pipeline, an electric gate valve is arranged on the sintering flue gas pipeline between the air outlet pipeline of the sintering machine air box and the air inlet pipeline of the baking furnace, an upper sealing valve is arranged in the baking, the lower sealing valve and the bottom sealing valve are arranged on the lower portion of the baking furnace, a chute is arranged on the lower portion of the baking furnace, a feeding belt conveyor is arranged above the baking furnace, a vibrating screen is arranged under the chute of the baking furnace, a lump ore belt conveyor and an undersize belt conveyor are arranged below the vibrating screen, a dust removal belt conveyor is arranged above the side of the vibrating screen, and a lump ore bin is arranged below the lump ore belt conveyor.
2. The device for reducing the powder content of the lump ore according to claim 1, wherein the longitudinal section of the flue gas hood is trapezoidal, the width of the cross section of the bottom of the flue gas hood is the same as the width of a trolley of a sintering machine, and the area of the cross section of the bottom of the flue gas hood is 2-4 times of the area of the cross section of a wind box of the sintering machine at the extracted sintering flue gas.
3. The apparatus for reducing the dust content of lumped ore according to claim 1, wherein said sintering machine windbox is a sintering machine windbox disposed at a distance 7/10-4/5 from a sintering machine head in a length direction of the sintering machine.
4. The apparatus for reducing the dust content of lump ore of claim 1, wherein said roaster is a vertical roaster having a cross section of circular or square.
5. The apparatus for reducing the dust content of lump ore of claim 1, wherein the angle between the axis of the air inlet duct and the air outlet duct of the roaster and the cross section of the roaster is 10 ° to 30 °.
6. The apparatus for reducing the dust content of lumped ore as claimed in claim 1, wherein the size of the hole of the vibration sieve is 5mm x 5 mm.
7. A method for reducing the dust content of lump ore, which is characterized in that the device of claim 1 is adopted, and comprises the following steps:
1) opening an upper sealing valve in the baking oven, operating a feeding belt conveyor to convey a certain amount of lump ore to an oven cavity between the upper sealing valve and a lower sealing valve in the baking oven, then opening the lower sealing valve in the baking oven to enable the lump ore to fall into a hearth of the baking oven, and closing the upper sealing valve and the lower sealing valve in the baking oven;
2) opening an electric gate valve arranged in a sintering flue gas pipeline between a sintering machine air box and a baking furnace, starting an electrostatic dust collector and an induced draft fan, pumping out high-temperature flue gas in the sintering machine air box by the induced draft fan, conveying the high-temperature flue gas to the baking furnace through the sintering flue gas pipeline, and baking lump ore in a hearth of the baking furnace for 20-30 min; when the lump ore is baked, the next baking material preparation is carried out, an upper sealing valve in the baking furnace is opened, and a feeding belt conveyor is operated to convey a certain amount of lump ore to a furnace chamber between the upper sealing valve and a lower sealing valve in the baking furnace, so that the next baking material preparation is completed;
3) controlling the vibrating screen to enter a working mode, opening a bottom sealing valve of the baking furnace, enabling dried lump ores to fall into the vibrating screen through a chute of the baking furnace for screening, closing the bottom sealing valve of the baking furnace after all the lump ores in the baking furnace fall into the vibrating screen, and controlling a screen underflow belt conveyor to transfer screen underflow of the vibrating screen to a sintering batching chamber for sintering batching; controlling a lump ore belt conveyor to transfer the screened lump ore to a lump ore bin for later use;
4) controlling an electrostatic dust collector to discharge dust, and controlling a dust removal belt conveyor to convey the dust removed from the electrostatic dust collector to a sintering batching chamber for later use;
5) repeating the steps 1) to 4) to carry out lump ore baking continuous operation;
6) when the lump ore baking is stopped, an electric gate valve arranged on a sintering flue gas pipeline between an air outlet pipeline of a sintering machine air box and an air inlet pipeline of a baking furnace is closed, and then the vibrating screen, the lump ore belt conveyor, the undersize belt conveyor, the induced draft fan, the electrostatic dust collector and the dust removal belt conveyor are stopped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710861964.9A CN109536701B (en) | 2017-09-21 | 2017-09-21 | Device and method for reducing powder content of lump ore |
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| CN201710861964.9A CN109536701B (en) | 2017-09-21 | 2017-09-21 | Device and method for reducing powder content of lump ore |
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| CN109536701B true CN109536701B (en) | 2020-08-11 |
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| CN112944931A (en) * | 2021-04-01 | 2021-06-11 | 昆山宇顺环保科技有限公司 | Device for drying lump ore by using low-temperature flue gas circulation of kiln |
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| JPS6092430A (en) * | 1983-10-27 | 1985-05-24 | Kawasaki Heavy Ind Ltd | Method for recovering waste heat from sintering apparatus |
| CN1125839A (en) * | 1994-12-26 | 1996-07-03 | 徐爱民 | Technological method of iron ore sintering for agglumeration |
| CN102072662B (en) * | 2009-11-25 | 2013-04-03 | 东北大学 | Integrative method and apparatus for waste heat recovery, flue gas treatment and porous sintering in sintering process |
| CN201962330U (en) * | 2010-12-14 | 2011-09-07 | 河南济源钢铁(集团)有限公司 | Lump ore baking system of sinter cooler |
| CN104748567B (en) * | 2015-03-27 | 2017-02-22 | 中国科学院过程工程研究所 | Sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system |
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