CN210215177U - Closed lime slaking system for steel sintering batching - Google Patents

Abstract

The utility model discloses a closed lime slaking system for iron and steel sintering batching, which comprises a lime slaking device and a water bath dust removal device, wherein the lime slaking device comprises at least one group of lime slaker, the lime slaker comprises a cylindrical shell, a dust removal port arranged on the shell, a feed port and a discharge port, and a spiral conveying blade and a water spraying pipeline are arranged inside the shell; the cylindrical shell comprises an inner shell and an outer shell, and a heating cavity is arranged between the inner shell and the outer shell; the dust removal port extends into the water bath dust removal device through the dust removal pipe, and water and filtered impurities are returned to the lime slaking device through the recovery pipeline and the bucket elevator I after dust removal. The system can control the temperature of the lime slaker, when the temperature is 65-80 ℃, the slaking rate of lime reaches 90% in 20-40min, and the impurity-containing steam generated in the lime slaking process is greatly improved for the working environment of an operation room after the dust removal, the recovery and the reutilization of the system.

Description

Closed lime slaking system for steel sintering batching

Technical Field

The utility model relates to a lime slaking field in the steel sintering, specifically is a closed lime slaking system is used to steel sintering batching.

Background

With the development of modern industry, the quality of life of people is improved, the requirement on environmental protection is higher and higher, and safe production and clean production become civilized marks of modern enterprises. In the ferrous metallurgy industry, the digestion of calcium oxide (CaO) is an indispensable process, and the conversion of calcium oxide (CaO) into calcium hydroxide (Ca (OH)₂) The conversion process can be realized only by adding water. However, in practice, if complete (CaO) is to be achieved with Ca (OH)₂The conversion is closely related to the way of adding water, the temperature of water and the reaction time. Therefore, in the quicklime digestion process, the following problems often occur:

(1) low digestion efficiency and long digestion time

In the process of slaking the quick lime, the quick lime reacts with water, so the traditional lime slaking method is to place the quick lime in a lime pool, add water in the lime pool for water sealing, the reaction speed is extremely slow, generally needs 24 hours, when the quick lime is discharged in the next day, a large amount of hardening can occur, the slaking effect of the lime is influenced, the slaking efficiency of the lime is extremely low, even partial lime can not be slaked, and white spots can be caused in subsequent sinter ores.

(2) Dust-containing gas generated in the lime slaking process can cause workshop lime dust, serious pollution and great harm to human bodies, and electric corrosion can also occur to equipment

The lime slaker simply mixes the material with moisture and does not begin slaking or has just begun slaking, resulting in too low a rate of slaking. Most of the quicklime can be digested on a conveyor belt or in a mixer, and some quicklime cannot be digested at the beginning of sintering. The hot flue gas and dust generated by the reaction of lime outside the digester are scattered on the sites of batching, digesting and the like, so that the pollution of the flue gas and dust on the site is serious. The problems of pipeline blockage, electric dust removal polar plate scaling and the like are caused after the flue gas and the lime powder enter the batching electric dust removal equipment, and the stable operation of electric dust removal is influenced. The hot smoke and dust emitted by the device are alkaline and substances with water vapor, and the primary battery is easy to form and seriously corrode other equipment on site, especially a belt gallery and a material cabin of a batching room. The calcium oxide (CaO) and calcium hydroxide (Ca (OH) 2) dust particles emitted to the site are small, and can stay in the air for a long time, thereby not only polluting the environment of a digestion room, but also causing harm to the health of site operators.

In response to these disadvantages, the prior art lime slaking systems typically employ multi-stage slaking and water bath dedusting, such as the following patent documents:

the utility model discloses a utility model patent with publication number CN206014705U discloses a lime slaking and dust pelletizing system, adopts the multistage digestion mode to quick lime slaking in this system, and lets in the dirty gas that produces among the digestion process to the aquatic and removes dust, and the gas outgoing after will removing dust again. The utility model improves the slaking efficiency of lime, but does not solve the problems of lime slaking temperature and too long lime slaking time; moreover, although the gas after dust removal is cleaner than the dust-containing gas in the digestion process, the impurities and water after dust removal are directly discharged from the sludge discharge device, and the impurities also contain a large amount of recyclable resources, which not only causes the consumption and waste of the raw lime, but also causes the waste of the water for dust removal.

In summary, the following steps: because the lime slaking process is closely related to water, temperature and time, the existing lime slaker improves the slaking efficiency of lime to a certain extent and produces a large amount of mixed fine particles CaO and Ca (OH) in the slaking process₂Dust and other impurities, but the slaking time of lime is still long, and the impurities after dust removal still contain a large amount of recyclable substancesTherefore, the existing lime slaker is still insufficient in slaking the quicklime, not only causes the waste of resources, but also consumes a large amount of manpower, material resources and time, so that a novel lime slaking system is needed to be used in the steel sintering ingredients to improve the lime slaking efficiency, control the lime slaking temperature, reduce the lime slaking time, reduce the air pollution and improve the working environment of workers.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve among the lime digestion process inefficiency, long time and discharge the serious problem of pollution, a closed lime digestion system is used to steel sintering batching is provided, use this system can carry out the control of temperature to the lime slaker, when the temperature is in 65 ℃ -80 ℃, make the digestibility of lime reach 90% in 20-40min, and the flue gas that contains impurity that produces among the lime digestion process is through the dust removal of this system, retrieve and recycle back, also had very big improvement to the operational environment of operation room.

The utility model discloses a realize that the technical scheme that above-mentioned technical purpose adopted does: a closed lime slaking system for steel sintering batching comprises a lime slaking device and a water bath dust removal device, wherein the lime slaking device comprises at least one group of lime slakers, each lime slaker comprises a cylindrical shell, a dust removal opening arranged on the cylindrical shell, and a feed inlet and a discharge outlet which are respectively arranged on the upper side and the lower side of the cylindrical shell, a spiral conveying blade and water spraying pipelines are arranged in the cylindrical shell, the spiral conveying blade is driven by a power assembly to rotate so as to convey lime, the water spraying pipelines are distributed along the lime conveying direction, and a plurality of water spraying openings are formed in the water spraying pipelines; the cylindrical shell comprises an inner shell, an outer shell and a heating cavity positioned between the inner shell and the outer shell, and a heating medium is injected into the heating cavity to keep the temperature in the cylindrical shell within 65-80 ℃ and improve the lime digestion efficiency; the dust removal port extends into the water bath dust removal device through a dust removal pipe to carry out water bath dust removal on dust-containing gas generated in the lime slaking process, the clean gas after dust removal is released into the air, and impurities and water which are retained in the water bath dust removal device are sent into a water spraying pipeline through a recovery pipeline to be reused as slaked water.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: the water bath dust removal device comprises a water tank, a spray tower and a fan, wherein the water tank is a closed water storage tank body, the middle part of the tank body is divided into a primary filtering area and a secondary filtering area by a partition plate, and water outlets with control valves are respectively arranged at the bottoms of the primary filtering area and the secondary filtering area; the port of the dust removal pipe extends below the water surface of the primary filtering area, the top of the primary filtering area is communicated with the bottom of the spray tower, so that the gas filtered by the primary filtering area enters the spray tower, a plurality of atomizing spray heads are arranged on the inner side wall of the spray tower, and the atomizing spray heads pump water from the secondary filtering area through a spray pipe to perform spray dust removal on the gas entering the spray tower; the fan is fixedly arranged above the secondary filtering area, an air suction port of the fan extends into the spray tower, an air exhaust port extends below the water surface of the secondary filtering area, so that the air sucked by the fan from the spray tower enters the secondary filtering area for secondary filtering, and a clean air exhaust port and a secondary filtering area water inlet are arranged at the top of the secondary filtering area; and a water pump is arranged above the primary filtering area, and a water outlet of the water pump is communicated with the recovery pipeline.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: be equipped with the desilting mouth of below and water tank bottom parallel and level on the lateral wall of primary filtration district to send the silt that sinks primary filtration district bottom to a bucket elevator I through this desilting mouth, carry to the feed inlet of lime slaker in through bucket elevator I again and retrieve and recycle.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: the lime slaking device comprises at least two groups of lime slakers which are respectively placed on steel structures with different heights, and a discharge hole of the upper layer of lime slaker is connected with a feed inlet of the lower layer of lime slaker.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: discharging the slaked lime through a discharge port, conveying the slaked lime to a screw scale I, and conveying the slaked lime into a slaked lime homogenizing device through a bucket elevator II by the screw scale I; the slaked lime homogenizing device comprises a homogenizing bin and a scraper conveyor, and slaked lime entering the homogenizing device is homogenized through the homogenizing bin and then output through the scraper conveyor for use.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: lime slaking device is including measuring transport structure, measures transport structure and includes feed bin, screw balance II and auger delivery ware, wherein, in the screw balance II weigh the back send into the auger delivery ware of retrieving material in the feed bin to transport to a double-shaft mixer by auger delivery ware in, stir and send to the feed inlet of first group of slaker with the quick lime that gets into quick lime pay-off mouth in the double-shaft mixer.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: and a heat insulation layer is arranged outside the cylindrical shell.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: the power assembly comprises a motor, and a rotating shaft of the motor penetrates through a bearing which plays a role in rotatably supporting the spiral conveying blade to drive the spiral conveying blade to rotate.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: and a water content tester for detecting the water content of the slaked lime at the material outlet of the last group of lime slaker is arranged at the material outlet, and the water spraying amount of the water spraying opening on the water spraying pipeline is controlled according to the detection result of the water content tester.

As the utility model relates to a steel sintering is further optimized of closed lime slaking system for batching: the heating medium is water smoke or heavy oil or hot air, and a channel for the heating medium to enter and exit is arranged on the heating cavity.

Advantageous effects

The utility model is provided with a heating cavity, and a heating medium is placed in the heating cavity to control the temperature in the digestion process, so that the temperature is 65-80 ℃, the digestion efficiency of lime is improved, and the digestion time is shortened; the practical result proves that when the temperature is 65-80 ℃, under the condition that water is completely contacted with quicklime, the lime slaking device can lead the slaking rate of lime to reach 90 percent within 20-40 min.

Secondly, the utility model discloses a lime slaker is the closed for lime is in the digestion in-process intensive mixing and can not discharge the raise dust to the air, provides good operational environment for the staff.

Three, the utility model discloses a lime slaking system includes water bath dust collector, can remove dust and retrieve the flue gas that contains the dust that digestion reaction produced in the digestion process for impurity that gets off is detained after the water bath dust removal and water are got back to the water spray pipeline of lime slaker under the effect of water pump and are done the slaking water, both make impurity and water by reuse, improved the utilization ratio of original lime, reduced the waste of water resource, make the air quality between digesting again have great promotion.

Four, the utility model discloses a lime slaking system sets up the moisture tester in the discharge gate department of lime slaker, can carry out the survey of moisture content to the hydrated lime of discharge gate, and then adjusts the moisture in the slaker through the water spray pipeline for the water yield of lime slaking in-process is moderate.

Fifthly, the utility model discloses be equipped with the insulating layer in cylindric casing's outside, both can keep warm to the heating chamber, can avoid again when the high temperature in the heating chamber, the temperature in the heating chamber outside causes the injury to the staff.

Sixthly, the lime slaking system of the utility model can make the lime slaking rate reach more than 90 percent, and when the slaked lime contains 7 percent of water, the lime slaking system can greatly exert Ca (OH)₂The viscosity of (c). Meanwhile, the volume of slaked lime after digestion is increased, compared with the prior art, under the same material proportion and mixing condition, the slaked lime is mixed more uniformly, thereby not only avoiding the phenomenon of white spots of sinter, but also improving the balling rate of the mixture by 2-5 percent. The smelting performance of the sintered ore can be improved, and important guarantee is provided for improving the yield and the quality.

Drawings

FIG. 1 is a schematic view of the overall structure of the lime slaking system of the present invention;

FIG. 2 is a schematic diagram of the construction of a lime slaking apparatus;

FIG. 3 is a schematic diagram of a lime slaker;

FIG. 4 is a schematic front view of the dust removing device with water bath;

FIG. 5 is a schematic side view of the dust removing device with water bath;

the labels in the figure are: 1. lime slaker, 2, cylindrical shell, 201, dedusting port, 202, feed inlet, 203, discharge port, 204, inner shell, 205, outer shell, 206, heating cavity, 207, heat insulation layer, 208, moisture tester, 3, power component, 301, motor, 302, bearing, 4, spiral conveying blade, 5, water spraying pipeline, 6, dedusting pipe, 7, recycling pipeline, 8, water tank, 801, partition board, 802, primary filtering area, 803, secondary filtering area, 804, clean air discharge port, 805, water inlet, 9, spray tower, 901, spray pipe, 10, fan, 11, water pump, 12, bucket elevator I, 13, spiral scale I, 14, bucket elevator II, 15, homogenizing bin, 16, scraper conveyor, 17, stock bin, 18, spiral scale II, 19, spiral conveyor, 20, feeding quicklime port, 21 and double-shaft mixer.

Detailed Description

The invention is further elucidated below on the basis of specific embodiments.

Example 1

A closed lime slaking system for steel sintering batching, the system comprises a lime slaking device and a water bath dust removal device, the lime slaking device comprises a group of lime slakers 1, as shown in figure 3, the lime slakers 1 comprise a cylindrical shell 2, dust removal ports 201 arranged on the cylindrical shell 2, and a feed port 202 and a discharge port 203 which are arranged on the upper side and the lower side of the cylindrical shell 2, a spiral conveying blade 4 for driving the lime slakers to rotate by a power assembly 3 and water spraying pipelines 5 distributed along the lime conveying direction are arranged in the cylindrical shell 2, a plurality of water spraying ports are arranged on the water spraying pipelines 5, the power assembly 3 comprises a motor 301, and a rotating shaft of the motor 301 penetrates through a bearing 302 for supporting and rotating the spiral conveying blade 4 to drive the spiral conveying blade 4 to operate; the cylindrical shell 2 comprises an inner shell 204, an outer shell 205 and a heating cavity 206 positioned between the inner shell 204 and the outer shell 205, a heating medium is placed in the heating cavity 206, a passage for the heating medium to enter and exit is arranged on the heating cavity 206, the heating medium is water smoke or heavy oil or hot air, the temperature in the cylindrical shell 2 can be kept between 65 ℃ and 80 ℃, and lime digestion is facilitated; the heat insulation layer 207 is arranged outside the cylindrical shell 2, so that the heat insulation effect on the heating medium in the heating cavity 206 can be achieved, workers can be isolated from the heating cavity 206, and the damage of the heating medium to the workers is avoided; a moisture tester 208 for detecting the moisture content of the slaked lime at the discharge port 203 of the lime slaker 1 is arranged at the discharge port 203, and the moisture content in the lime slaker 1 can be adjusted by adjusting the water spraying amount in the water spraying pipeline 5 after the moisture tester detects the moisture content; the dust removal port 201 extends into the water bath dust removal device through a dust removal pipe 6 to remove dust in a water bath from dust-containing gas generated in the lime slaking process, the clean gas after dust removal is released into the air, and the retained impurities and water return to the lime slaking device through a recovery pipeline 7.

As shown in fig. 4 and 5, the water bath dust removing device comprises a water tank 8, a spray tower 9 and a fan 10, wherein the water tank 8 is a closed water storage tank, the bottom parts of the two ends of the tank are respectively provided with a water outlet, the middle of the tank is divided into a primary filtering area 802 and a secondary filtering area 803 by a partition plate 801, and the bottoms of the primary filtering area 802 and the secondary filtering area 803 are respectively provided with a water outlet with a control valve; the port of the dust removal pipe 6 extends below the water surface of the primary filtering area 802, the top of the primary filtering area 802 is communicated with the bottom of the spray tower 9, so that the gas filtered by the primary filtering area 802 enters the spray tower 9, a plurality of atomizing nozzles are arranged on the inner side wall of the spray tower 9, and the atomizing nozzles pump water from the secondary filtering area 803 through a spray pipe 901 to perform spray dust removal on the gas entering the spray tower 9; the fan 10 is fixedly arranged above the secondary filtering area 803, an air suction port of the fan 10 extends into the spray tower 9, an air exhaust port extends below the water surface of the secondary filtering area 803, so that the air sucked by the fan 10 from the spray tower 9 enters the secondary filtering area 803 for secondary filtering, and a clean air exhaust port 804 and a water tank 8 water inlet 805 are arranged at the top of the secondary filtering area 803; the water pump 11 is arranged above the primary filtering area 802, so that impurities such as water filtered by the primary filtering area 802 and dust retained by the primary filtering area 802 enter the lime slaker through the recovery pipeline 7 to be recovered and reused, the utilization rate of the raw lime is improved, the consumption of the lime is reduced, the water is reused, and water resources are saved.

The utility model discloses a novel digestion system is under lime slaker 1 inside auger delivery blade 4's stirring transport effect for lime contacts completely with 5 spun water of water spray pipe way, injects heating medium again in heating chamber 206, and under the dual function of temperature and full contact, the digestion efficiency and the rate of digestion of lime improve greatly. When the temperature is 65-80 ℃, the lime digestion speed is fastest, and 90% of lime digestion can be completed within 20-40 min. Since there is only one set of lime slakers, the running time of lime in the set of slakers is 20-40 min.

Example 2

The lime slaking device comprises at least two groups of lime slakers 1 which are respectively placed on steel structures with different heights, and the discharge hole 203 of the upper lime slaker 1 is connected with the feed hole 202 of the lower lime slaker 1, so that the occupied space of the lime slaking device is saved, and the space utilization rate of a slaking room is improved; a moisture meter 208 for detecting the moisture content of the slaked lime at the discharge port 203 of the lime slaker 1 of the lowermost layer is provided at the discharge port 203 to adjust the moisture content in the lime slaker 1 by adjusting the amount of water spray in the water spray pipe 5. Since the lime slaking plant comprises at least two sets of lime slakers 1, the running time of the lime in the slaking plant is 20-40 min.

Example 3

This embodiment is right the utility model discloses a further optimization: be equipped with the desilting mouth of below and water tank bottom parallel and level on the lateral wall of primary filtration district 802, the accessible is artifical will sink the mud of primary filtration district bottom and send to a bucket elevator I12 in, carry to the lime slaking device through bucket elevator I12 again and retrieve and recycle. As shown in fig. 2, the lime slaking device comprises a metering and conveying structure, the metering and conveying structure comprises a storage bin 17, a spiral scale II 18 and a spiral conveyor 19, wherein the settled sludge conveyed by a bucket elevator I12 enters the storage bin 17, is weighed by the spiral scale II 18 and then is conveyed into the spiral conveyor 19, is conveyed into a double-shaft stirrer 21 by the spiral conveyor 19, is stirred with the quick lime entering a quick lime feeding port 20 and is conveyed into a feeding port 202 of the first group of digesters.

Example 4

This example is a further optimization of the overall digestive system: as shown in fig. 1, the slaked lime is discharged through a discharge port 203 and then sent to a screw scale I13, and is conveyed to the slaked lime homogenizing device through a bucket elevator II 14 by the screw scale I13; the slaked lime homogenizing device comprises a homogenizing cabin 15 and a scraper conveyor 16, and slaked lime entering the homogenizing device is homogenized through the homogenizing cabin 15 and then output by the scraper conveyor 16 for use.

The whole slaking process of the lime slaking system of the utility model is as follows: the quick lime enters a quick lime feeding port, is conveyed to a feeding port of a first group of slakers through a double-shaft mixer, is slaked through at least one group of lime slakers, a heating medium is injected into a heating chamber in the slaking process for controlling the temperature in the slaking process, a moisture meter is arranged at a discharging port of the last group of lime slakers for measuring the moisture content of the slaked lime, a water spraying pipeline is controlled through the measuring result of the moisture meter to adjust the moisture content in the lime slakers, the slaked lime is discharged through the discharging port of the slakers and then conveyed to a screw scale I, the screw scale I is conveyed to a homogenizing bin through a bucket elevator II, and the slaked lime is homogenized through the homogenizing bin and then is output by a scraper conveyor for use; the flue gas containing impurities such as dust particles and the like generated in the lime slaking process enters a primary filtering area through a dust removal port and a dust removal pipe for primary dust removal, negative pressure is formed on the primary filtering area through a spray tower under the action of a fan, the flue gas subjected to primary filtering enters the spray tower for spray dust removal, and finally the flue gas enters a secondary filtering area through an air outlet of the fan for secondary filtering, so that the flue gas subjected to multiple times of dust removal is discharged through a clean air outlet; and the impurity such as particulate matter and water that are detained down in the primary filtration district go into lime slaker through the recovery pipeline under the effect of water pump and reuse in and deposit the silt that is in the primary filtration district bottom then through setting up the desilting mouth on the lateral wall of primary filtration district, manual cleaning is carried out, send the silt that sinks into the primary filtration district bottom to bucket elevator I, carry out recovery and reuse in the feed bin of lime slaking device via bucket elevator I again, after getting into the feed bin, in sending into screw conveyor after weighing II through the spiral, and transport to the double-shaft mixer by screw conveyor, stir and carry to and continue to carry out lime slaking in the feed inlet of first group slaker with the quick lime that gets into in the quick lime pay-off mouth.

Claims (10)

1. A closed lime slaking system for steel sintering batching is characterized in that: the system comprises a lime slaking device and a water bath dust removal device, wherein the lime slaking device comprises at least one group of lime slakers (1), each lime slaker (1) comprises a cylindrical shell (2), a dust removal port (201) arranged on the cylindrical shell (2), a feed inlet (202) and a discharge outlet (203) which are respectively arranged on the upper side and the lower side of the cylindrical shell (2), a spiral conveying blade (4) which is driven by a power assembly (3) to rotate to convey lime and water spraying pipelines (5) distributed along the lime conveying direction are arranged in the cylindrical shell (2), and a plurality of water spraying ports are arranged on each water spraying pipeline (5); the cylindrical shell (2) comprises an inner shell (204), an outer shell (205) and a heating cavity (206) positioned between the inner shell (204) and the outer shell (205), wherein a heating medium is injected into the heating cavity (206) to keep the temperature in the cylindrical shell (2) at 65-80 ℃ and improve the lime digestion efficiency; the dust removal port (201) extends into the water bath dust removal device through a dust removal pipe (6) to carry out water bath dust removal on dust-containing gas generated in the lime slaking process, the dust-removed clean gas is released into the air, and impurities and water remained in the water bath dust removal device are sent into the water spraying pipeline (5) through the recovery pipeline (7) to be reused as slaked water.

2. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: the water bath dust removal device comprises a water tank (8), a spray tower (9) and a fan (10), wherein the water tank (8) is a closed water storage tank body, the middle part of the tank body is divided into a primary filtering area (802) and a secondary filtering area (803) by a partition plate (801), and water outlets with control valves are respectively arranged at the bottoms of the primary filtering area (802) and the secondary filtering area (803); the port of the dust removal pipe (6) extends below the water surface of the primary filtering area (802), the top of the primary filtering area (802) is communicated with the bottom of the spray tower (9) so that the gas filtered by the primary filtering area (802) enters the spray tower (9), a plurality of atomizing nozzles are arranged on the inner side wall of the spray tower (9), and the atomizing nozzles pump water from the secondary filtering area (803) through a spray pipe (901) to perform spray dust removal on the gas entering the spray tower (9); the fan (10) is fixedly arranged above the secondary filtering area (803), a suction port of the fan (10) extends into the spray tower (9), an exhaust port extends below the water surface of the secondary filtering area (803) so that gas sucked by the fan (10) from the spray tower (9) enters the secondary filtering area (803) for secondary filtering, and the top of the secondary filtering area (803) is provided with a clean air outlet (804) and a water inlet (805) of the secondary filtering area (803); a water pump (11) is arranged above the primary filtering area (802), and a water outlet of the water pump (11) is communicated with the recovery pipeline (7).

3. The closed lime slaking system for steel sintering burden as set forth in claim 2, wherein: the side wall of the primary filtering area (802) is provided with a dredging opening, the lower portion of the dredging opening is parallel to the bottom of the water tank (8), sludge sinking into the bottom of the primary filtering area (802) is conveyed to a bucket elevator I (12) through the dredging opening, and the sludge is conveyed to a feeding hole (202) of the lime slaker (1) through the bucket elevator I (12) to be recycled.

4. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: the lime slaking device comprises at least two groups of lime slakers (1) which are respectively arranged on steel structures with different heights, and a discharge hole (203) of the upper layer of lime slaker (1) is connected with a feed hole (202) of the lower layer of lime slaker (1).

5. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: discharging the slaked lime through a discharge port (203), conveying the slaked lime to a screw scale I (13), and conveying the slaked lime into a slaked lime homogenizing device through a bucket elevator II (14) by the screw scale I (13); the slaked lime homogenizing device comprises a homogenizing cabin (15) and a scraper conveyor (16), and slaked lime entering the homogenizing device is homogenized through the homogenizing cabin (15) and then is output by the scraper conveyor (16) for use.

6. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: lime slaking device is including measurement transport structure, and measurement transport structure includes feed bin (17), screw balance II (18) and screw conveyer (19), and wherein, the recovery material in feed bin (17) is sent into screw conveyer (19) in weighing through screw balance II (18) to in transporting to a double-shaft mixer (21) by screw conveyer (19), stir and send to in feed inlet (202) of first group slaker with the quick lime that gets into quick lime pay-off mouth (20) in double-shaft mixer (21).

7. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: a heat insulation layer (207) is arranged outside the cylindrical shell (2).

8. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: the power assembly (3) comprises a motor (301), and a rotating shaft of the motor (301) passes through a bearing (302) which plays a role in rotatably supporting the spiral conveying blade (4) to drive the spiral conveying blade (4) to run.

9. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: when the number of the lime slakers (1) in the lime slaking device is two or more, the lime slakers (1) are sequentially connected in series, a moisture meter (208) for detecting the moisture content of the slaked lime at the discharge port (203) of the last lime slaker (1) is arranged at the discharge port (203), and the water spraying amount of the water spraying port on the water spraying pipeline (5) is controlled according to the detection result of the moisture meter (208).

10. The closed lime slaking system for steel sintering burden as set forth in claim 1, wherein: the heating medium is steam or heavy oil or hot air, and a channel for the heating medium to enter and exit is arranged on the heating cavity (206).

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