CN114314588A - CO in waste gas generated in lime kiln production of lime2Sealing and recycling method - Google Patents
CO in waste gas generated in lime kiln production of lime2Sealing and recycling method Download PDFInfo
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Abstract
The invention discloses CO in waste gas generated in lime kiln production of lime2The method for sealing and recycling comprises the steps of construction of pretreatment equipment, feeding of carbide slag, pretreatment of waste gas, storage of reaction slurry, sealing reaction, recycling of slurry and the like. Aiming at the double environmental pollution of a large amount of carbide slag waste and the carbon emission of the lime kiln in the factory, the invention adopts CO in the carbide slag and the tail gas of the lime kiln2The violent reaction is carried out at high temperature and high pressure to form thick slurry with a large amount of bubbles so as to seal CO in the waste gas2And a sulfur removal effect; the invention converts CO into2Sealing in viscous carbide slag slurry to form more viscous paste after sealing for a long timeMainly contains calcium carbonate, is made into superfine active calcium oxide by carbon powder pressed ball, roasting and decomposing, and realizes carbide slag and CO2The common recycling of the carbide slag and CO in the field2The recycling provides a digestion platform, and the treatment is easier, the cost is lower, and the method is suitable for popularization.
Description
Technical Field
The invention relates to the technical field of lime kiln waste gas treatment, in particular to CO in waste gas generated in lime kiln lime production2A method for sealing and recycling.
Background
The waste gas from lime kiln production of calcium lime mainly contains about 75% of N2And over 20% CO2Further comprises H2O, CO, small amount of sulfur-containing compounds and nitrogen-containing compounds, except for desulfurization and denitrification before emission, in recent years, with higher and higher carbon emission standards, CO needs to be found in various large lime kiln plants2The reasonable utilization mode of the method.
Current CO2Mainly in two aspects of sequestration and reuse, CO2The sealing is mainly used for sealing after trapping so as to reduce the total carbon emission of the atmosphere; CO 22The recycling is mainly to obtain high-purity CO after separation by a separator2And then made into dry ice or reacted into other high-value organic chemicals.
However, except for specific applications in the field of oil exploitation, other sealing and recycling routes are in the laboratory stage and cannot be applied industrially. The Ca recycling economy becomes a system by combining the total production flow of acetylene by the calcium carbide method in the factory, and in the recycling process, multiple steps need CO2Production and participation of, e.g. lime mortar with CO2Preparation of calcium carbonate, decomposition of calcium carbonate and production of CO2. However, the current preparation process of calcium carbonate still needs longer reaction time, and the local economic area is lack of CO2Especially to provide an industrially applicable CO2A method for sealing and reusing.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides CO in the waste gas generated in lime production in a lime kiln2A method for sealing and recycling.
In order to achieve the purpose, the invention adopts the following technical scheme:
CO in waste gas generated in lime kiln production of lime2The sealing and recycling method comprises the following steps:
s1, construction of pretreatment equipment: building a pressure-resistant cylindrical mixing tower, wherein a closed motor chamber is arranged below the mixing tower, a motor is arranged in the motor chamber, a motor driving shaft vertically extends upwards and to the middle lower part in the mixing tower and is connected with a vortex stirring paddle, the bottom wall of the motor chamber is provided with an installation base, and the installation base is a thick flange plate and is installed in a workshop through a ground bolt;
the side wall of the mixing tower is sequentially provided with a slag discharge port, a waste gas inlet, a slurry outlet and a clear liquid outlet from bottom to top, the slag discharge port is arranged at the bottom of the side wall of the mixing tower and used for discharging insoluble precipitated slag slurry, the clear liquid outlet is arranged at the upper position of the middle part of the side wall of the mixing tower and used for discharging supernatant, the waste gas inlet is as high as the vortex stirring paddle, and the slurry outlet is slightly higher than the waste gas inlet and used for discharging middle-layer suspended slurry;
an extruder is embedded into the top of the side wall of the mixing tower, an outlet at one end of the extruder extends into the mixing tower and faces downwards, an outlet at the other end of the extruder faces upwards and is communicated with the inner cavity of the crusher for feeding, and a feed hopper is arranged at the top of the crusher and used for crushing carbide slag;
the top of the mixing tower is provided with an exhaust port for exhausting unreacted exhaust gas;
s2, carbide slag feeding: putting the carbide slag into a crusher, adding water properly, crushing and extruding the carbide slag into a mixing tower until the liquid level accounts for 2/5 of the volume of the mixing tower, sealing all outlets of the mixing tower and covering a feed hopper of the crusher to enable the mixing tower to be in a closed state, starting a vortex stirring paddle, fully stirring and generating a vortex, and enabling the highest liquid level of the vortex to be higher than that of a clear liquid outlet; the center of the vortex is gradually clear, the slurry near the inner wall of the mixing tower is gradually viscous and suspended under the centrifugal action, and larger blocks of the slurry gradually sink to the bottom of the mixing tower and are stirred;
s3, pretreatment of waste gas: continuously introducing lime kiln waste gas with the temperature higher than 200 ℃ into a waste gas inlet through a pressure pump until a large amount of bubbles are generated in a system in a mixing tower, reacting, adjusting the pressure of a valve of the waste gas inlet to be controlled to be more than 2.5MPa, controlling the air pressure in the mixing tower through the valve of the waste gas inlet, controlling the air pressure at the top in the mixing tower to be 1.5-2MPa, controlling the air temperature at the middle lower part of the inner side wall of the mixing tower to be 180 ℃, and reacting for 30-50 min;
when the air pressure at the top in the mixing tower exceeds 2MPa, immediately closing the waste gas inlet, stirring and reacting for 5min, observing whether the air pressure in the tower rapidly drops, opening the waste gas inlet when the air pressure in the tower drops to 2MPa, and continuing air intake, wherein if the air pressure cannot rapidly drop, air intake is stopped;
stopping the vortex stirring paddle after the reaction is finished, standing for 5-10min, sampling and testing the gas component at the top in the tower until the gas component contains CO2Less than 3%, the exhaust port is opened and N is discharged2And H2Discharging gas mainly containing O, and relieving pressure to normal pressure;
s4, storing the reaction slurry: repeating the step S3, intermittently treating the lime kiln waste gas, keeping the air pressure at the top of the mixing tower to 1.5-2MPa when the pH value of the surface layer of the liquid level in the mixing tower is lower than 10, closing all inlets and outlets of the mixing tower, keeping the liquid level of the mixing tower higher than the liquid level outlet, filling air bubbles into the mixing tower, standing and aging for 20min until the mixing tower is layered, wherein the bottom is slag slurry, the top is clear liquid, and the middle is thick slurry;
building a slurry storage tank, namely opening a clear liquid outlet, automatically pressing clear liquid at the top in the tower into the slurry storage tank by internal pressure, opening a slurry outlet, automatically pressing slurry in the tower to be below the liquid level of the clear liquid in the slurry storage tank by the internal pressure, standing, finally opening a slag discharging port, automatically pressing slag slurry in the tower to be above an interface between the clear liquid and the slurry in the slurry storage tank by the internal pressure, wherein the pipe orifice of a slag slurry conveying pipe needs to be moved uniformly, and the slag slurry is spread on the slurry uniformly to play a role in compacting the slurry and isolating the slurry;
s5, sealing reaction: repeating the reaction steps S3-S4 until the slurry storage tank is full, covering and sealing for more than one month, observing the state in the slurry storage tank until the gas-solid-liquid three-phase reaction in the slurry storage tank is completely consumed, forming a layer of hard stone plate by the slurry, wherein the slurry below the hard stone plate forms a super-viscous paste when the height of the hard stone plate is lower than that of the slurry before sealing, increasing and clarifying the clear liquid above the hard stone plate, and detecting that the pH value of the slurry is reduced to be less than 9.5;
s6, recycling the slurry: extracting supernatant from the slurry storage tank to expose the hard slate, breaking the hard slate with a light hammer, and grabbing the broken slate containing CaCO330-40% of the total weight, and the balance of Ca (OH)2And Si, Fe, Mg and other impurities, and the cement clinker is used after being fired;
paste in the stock chest is detected to contain CaCO375-80% of Ca (OH)215-20%, adding dried carbon powder into slurry storage tank, stirring, pressing into paste balls, drying until water content is less than 2%, breaking the paste balls, and calcining at 400 deg.C for 1 hr to produce CO2And consume Ca (OH)2Until the carbon powder is completely consumed, removing ash by air separation, and detecting the rest powder, wherein CaCO3The content is more than 95 percent and the grain diameter is not more than 200 nanometers, then the material is transferred to a lime kiln and is fired at 1050 ℃, and the superfine active calcium oxide with uniform grain diameter distribution and the grain diameter not more than 300 nanometers is obtained.
Preferably, the swirl-paddle structure is as follows: the top end of the motor driving shaft is connected with a plurality of blades through a supporting rod, adjacent blades are connected in series through a ring, a spring ring is wound outside the ring of blades and forms a horizontal circle, and the circle center and the mixing tower are concentrically arranged. Facilitating the formation of larger vortices and increasing the amount of bubbles at the bottom of the vortices.
Preferably, the extruder is a twin-screw extruder and is provided with two counter-rotating drive motors for stirring and extruding the carbide slag.
Preferably, the crusher is in particular a jaw crusher for crushing the carbide slag and further dissolving the wet carbide slag.
Compared with the prior art, the invention has the beneficial effects that:
1. aiming at the double environmental pollution of a large amount of carbide slag waste and the carbon emission of the lime kiln in the factory, the invention adopts CO in the carbide slag and the tail gas of the lime kiln2Reacting vigorously at high temperature and high pressure to form thick slurry with a large amount of bubbles, and obtaining clear liquid and slagThe slag is laid and compacted and the clear liquid is sealed and covered, so that the effect of sealing and storing the slurry is achieved, wherein the CO in the existing sealing and storing waste gas2The effect of (3) also has the object of removing sulfur-containing compounds and part of nitrogen-containing compounds in the exhaust gas;
2. the invention utilizes a special pretreatment reaction and a sealing method to react and seal CO2Sealing in viscous carbide slag slurry to form more viscous paste after sealing for a long time, wherein calcium carbonate is mainly contained, carbon powder is pressed into balls and roasted to decompose, and superfine active calcium oxide is prepared to realize carbide slag and CO2The common recycling of the carbide slag and CO in the field2The recycling provides a digestion platform, and the treatment is easier, the cost is lower, and the method is suitable for popularization.
Drawings
FIG. 1 is a diagram of the structure of a mixing tower used in the present invention and a process diagram of a pretreatment reaction;
FIG. 2 is a block diagram of a sequestration method proposed by embodiment 1 of the present invention;
fig. 3 is a structural diagram of a sequestration method provided in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
referring to fig. 1-2, CO in exhaust gas from lime kiln production of lime2The sealing and recycling method comprises the following steps:
s1, construction of pretreatment equipment: building a pressure-resistant cylindrical mixing tower 1, wherein a closed motor chamber 2 is arranged below the mixing tower 1, a motor is arranged in the motor chamber 2, a motor driving shaft vertically extends upwards to the middle lower part of the mixing tower 1 and is connected with a vortex stirring paddle 3, the bottom wall of the motor chamber 2 is provided with an installation base 4, and the installation base 4 is a thick flange plate and is installed in a workshop through a ground bolt;
the side wall of the mixing tower 1 is sequentially provided with a slag discharge port 5, a waste gas inlet 6, a slurry outlet 7 and a clear liquid outlet 8 from bottom to top, the slag discharge port 5 is arranged at the bottom of the side wall of the mixing tower 1 and used for discharging insoluble precipitated slag slurry, the clear liquid outlet 8 is arranged at the upper position of the middle part of the side wall of the mixing tower 1 and used for discharging supernatant, the waste gas inlet 6 and the vortex stirring paddle 3 have the same height, and the slurry outlet 7 is slightly higher than the waste gas inlet 6 and used for discharging middle-layer suspended slurry;
the top of the side wall of the mixing tower 1 is embedded into an extruder 9, an outlet at one end of the extruder 9 extends into the mixing tower 1 and faces downwards, an outlet at the other end of the extruder 9 faces upwards and is communicated with an inner cavity of a crusher 10 for feeding, and the top of the crusher 10 is provided with a feed hopper for crushing carbide slag;
the top of the mixing tower 1 is provided with an exhaust port 11 for exhausting unreacted exhaust gas;
s2, carbide slag feeding: putting the carbide slag into a crusher 10, adding water properly, crushing and extruding the carbide slag into a mixing tower 1 until the liquid level accounts for 2/5 of the volume of the mixing tower 1, sealing all outlets of the mixing tower 1 and covering a feed hopper of the crusher 10 to enable the mixing tower 1 to be in a closed state, starting a vortex stirring paddle 3, fully stirring and generating a vortex, and enabling the highest liquid level of the vortex to be higher than a clear liquid outlet 8; the center of the vortex is gradually clear, the slurry near the inner wall of the mixing tower 1 is gradually viscous and suspended under the centrifugal action, and larger blocks gradually sink to the bottom of the mixing tower 1 and are stirred;
s3, pretreatment of waste gas: continuously introducing lime kiln waste gas with the temperature higher than 200 ℃ into the waste gas inlet 6 through a pressure pump until a large amount of bubbles are generated in the internal system of the mixing tower 1, reacting, adjusting the valve pressure of the waste gas inlet 6 to be more than 2.5MPa, controlling the air pressure in the tower through the valve flow of the waste gas inlet 6, controlling the air pressure at the top of the mixing tower 1 to be 1.5-2MPa, controlling the air temperature at the middle lower part of the inner side wall of the mixing tower 1 to be 180 ℃, and reacting for 30-50 min;
when the air pressure at the top in the mixing tower 1 exceeds 2MPa, immediately closing the waste gas inlet 6, stirring and reacting for 5min, observing whether the air pressure in the tower rapidly drops, opening the waste gas inlet 6 when the air pressure in the tower drops to 2MPa, and continuously introducing air, wherein if the air pressure cannot rapidly drop, the air is not introduced;
after the reaction is finished, stopping the vortex stirring paddle 3 and standingSampling and testing the top gas component in the tower for 5-10min until the gas component contains CO2Less than 3%, the exhaust port 11 is opened and N is discharged2And H2Discharging gas mainly containing O, and relieving pressure to normal pressure;
s4, storing the reaction slurry: repeating the step S3, intermittently treating the lime kiln waste gas, when the pH value of the surface layer of the liquid level in the mixing tower 1 is lower than 10, maintaining the air pressure at the top of the mixing tower 1 to be 1.5-2MPa, closing all inlets and outlets of the mixing tower 1, keeping the liquid level of the mixing tower 1 higher than the clear liquid outlet 8 at the moment, filling bubbles in the mixing tower 1, standing and aging for 20min until the mixing tower 1 is layered, wherein the bottom is slag slurry, the top is clear liquid, and the middle is thick slurry;
building a slurry storage tank, firstly opening a clear liquid outlet 8, automatically pressing clear liquid at the top in the tower into the slurry storage tank by internal pressure, then opening a slurry outlet 7, automatically pressing the slurry in the tower to be below the liquid level of the clear liquid in the slurry storage tank by the internal pressure, standing, finally opening a slag discharge port 5, automatically pressing the slag slurry in the tower to be above a separation surface of the clear liquid and the slurry in the slurry storage tank by the internal pressure, wherein the step needs to uniformly move a pipe opening of a slag slurry conveying pipe, and plays a role in compacting the slurry and isolating the slurry when the slag slurry is uniformly spread on the slurry;
s5, sealing reaction: repeating the reaction steps S3-S4 until the slurry storage tank is full, covering and sealing for more than one month, observing the state in the slurry storage tank until the gas-solid-liquid three-phase reaction in the slurry storage tank is completely consumed, forming a layer of hard stone plate by the slurry, wherein the slurry below the hard stone plate forms a super-viscous paste when the height of the hard stone plate is lower than that of the slurry before sealing, increasing and clarifying the clear liquid above the hard stone plate, and detecting that the pH value of the slurry is reduced to be less than 9.5;
s6, recycling the slurry: extracting supernatant from the slurry storage tank to expose the hard slate, breaking the hard slate with a light hammer, and grabbing the broken slate containing CaCO330-40% of the total weight, and the balance of Ca (OH)2And Si, Fe, Mg and other impurities, and the cement clinker is used after being fired;
paste in the stock chest is detected to contain CaCO375-80% of Ca (OH)2Adding dried carbon powder 15-20%, stirring, pressing into paste ball, and oven drying until water content is less than2 percent, breaking the paste balls, putting the paste balls into a roasting furnace, and burning for 1h at 400 ℃ to produce CO2And consume Ca (OH)2Until the carbon powder is completely consumed, removing ash by air separation, and detecting the rest powder, wherein CaCO3The content is more than 95 percent and the grain diameter is not more than 200 nanometers, then the material is transferred to a lime kiln and is fired at 1050 ℃, and the superfine active calcium oxide with uniform grain diameter distribution and the grain diameter not more than 300 nanometers is obtained.
Referring to fig. 1, the vortex paddle 3 is constructed as follows: the top end of the motor driving shaft is connected with a plurality of blades through a supporting rod, adjacent blades are connected in series through a ring, a spring ring is wound outside the ring of blades and forms a horizontal circle, and the circle center and the mixing tower 1 are concentrically arranged. Facilitating the formation of larger vortices and increasing the amount of bubbles at the bottom of the vortices.
Referring to fig. 1, the extruder 9 is specifically a twin-screw extruder and is provided with two counter-rotating drive motors for stirring and extruding the carbide slag.
Referring to fig. 1, a crusher 10, specifically a jaw crusher, is used for crushing the carbide slag and further dissolving the wet carbide slag.
Example 2:
referring to fig. 1 and 3, the slurry storage tank of example 1 may be modified by disposing a partition net at the lower part of the slurry storage tank to form a plurality of square-block-shaped storage spaces, pressing the slurry into one storage space during the storage of the reaction slurry in step S4, filtering the slurry through the partition net to further compact the slurry, injecting the slurry from another adjacent storage space when the storage space is full, and laying the slurry thereon, and the rest of the operation is the same as that of example 1.
The improvement promotes the paste in the step S5 to have smaller water content, and the use amount of carbon powder used in the subsequent step S6 is correspondingly reduced, so that the roasting ash content can be reduced, and the cost is further reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. CO in waste gas generated in lime kiln production of lime2The sealing and recycling method is characterized by comprising the following steps:
s1, construction of pretreatment equipment: building a pressure-resistant cylindrical mixing tower (1), wherein a closed motor chamber (2) is arranged below the mixing tower (1), a motor is arranged in the motor chamber (2), a motor driving shaft vertically extends upwards to the middle lower part of the mixing tower (1) and is connected with a vortex stirring paddle (3), an installation base (4) is arranged on the bottom wall of the motor chamber (2), and the installation base (4) is a thick flange and is installed in a workshop through a ground bolt;
the side wall of the mixing tower (1) is sequentially provided with a slag discharge port (5), a waste gas inlet (6), a slurry outlet (7) and a clear liquid outlet (8) from bottom to top, the slag discharge port (5) is arranged at the bottom of the side wall of the mixing tower (1) and is used for discharging insoluble and precipitated slag slurry, the clear liquid outlet (8) is arranged at the upper middle part of the side wall of the mixing tower (1) and is used for discharging supernatant liquid, the waste gas inlet (6) is as high as the vortex stirring paddle (3), and the slurry outlet (7) is slightly higher than the waste gas inlet (6) and is used for discharging middle-layer suspended slurry;
the top of the side wall of the mixing tower (1) is embedded into an extruder (9), an outlet at one end of the extruder (9) extends into the mixing tower (1) and faces downwards, an outlet at the other end of the extruder (9) faces upwards and is communicated with an inner cavity of a crusher (10) for feeding, and a feed hopper is arranged at the top of the crusher (10) and used for crushing carbide slag;
the top of the mixing tower (1) is provided with an exhaust port (11) for exhausting unreacted exhaust gas;
s2, carbide slag feeding: putting the carbide slag into a crusher (10), adding water properly, crushing and extruding the carbide slag into a mixing tower (1) until the liquid level accounts for 2/5 of the volume of the mixing tower (1), sealing all outlets of the mixing tower (1) and covering a feed hopper of the crusher (10) to ensure that the mixing tower (1) is in a closed state, starting a vortex stirring paddle (3), fully stirring and generating a vortex, and ensuring that the highest liquid level of the vortex is higher than a clear liquid outlet (8); the center of the vortex is gradually clear, the slurry near the inner wall of the mixing tower (1) is gradually viscous and suspended under the centrifugal action, and larger blocks gradually sink to the bottom of the mixing tower (1) and are stirred;
s3, pretreatment of waste gas: continuously introducing lime kiln waste gas with the temperature higher than 200 ℃ into the waste gas inlet (6) through a pressure pump until a large number of bubbles are generated in the internal system of the mixing tower (1), reacting, adjusting the valve pressure of the waste gas inlet (6) to be controlled to be more than 2.5MPa, controlling the air pressure in the mixing tower (1) through the valve flow of the waste gas inlet (6), controlling the air pressure at the top of the mixing tower (1) to be 1.5-2MPa, controlling the air temperature at the middle lower part of the inner side wall of the mixing tower (1) to be 150 DEG and 180 ℃, and reacting for 30-50 min;
when the air pressure at the top in the mixing tower (1) exceeds 2MPa, immediately closing the waste gas inlet (6), stirring and reacting for 5min, observing whether the air pressure in the tower rapidly drops, opening the waste gas inlet (6) when the air pressure drops to 2MPa, and continuing air intake, wherein if the air pressure does not rapidly drop, air intake is stopped;
stopping the vortex stirring paddle (3) after the reaction is finished, standing for 5-10min, sampling and testing the gas component at the top in the tower until the gas component contains CO2Less than 3%, the exhaust port (11) is opened and N is discharged2And H2Discharging gas mainly containing O, and relieving pressure to normal pressure;
s4, storing the reaction slurry: repeating the step S3, intermittently treating the lime kiln waste gas, keeping the air pressure at the top of the mixing tower (1) to 1.5-2MPa when the pH value of the surface layer of the liquid level in the mixing tower (1) is lower than 10, closing all inlets and outlets of the mixing tower (1), keeping the liquid level of the mixing tower (1) higher than the clear liquid outlet (8), keeping the mixing tower (1) to be high in viscosity, filling air bubbles in the mixing tower, standing and aging for 20min until the mixing tower (1) is layered, wherein the bottom is slag slurry, the top is clear liquid, and the middle is thick slurry;
building a slurry storage pool, namely opening a clear liquid outlet (8), automatically pressing clear liquid at the top in the tower into the slurry storage pool by internal pressure, then opening a slurry outlet (7), automatically pressing the slurry in the tower to be below the liquid level of the clear liquid in the slurry storage pool by the internal pressure, standing, finally opening a slag discharge port (5), automatically pressing slag slurry in the tower to be above a separating surface of the clear liquid and the slurry in the slurry storage pool by the internal pressure, wherein a pipe opening of a slag slurry conveying pipe needs to be moved uniformly, and the slag slurry is spread on the slurry uniformly to compact the slurry and isolate the slurry;
s5, sealing reaction: repeating the reaction steps S3-S4 until the slurry storage tank is full, covering and sealing for more than one month, observing the state in the slurry storage tank until the gas-solid-liquid three-phase reaction in the slurry storage tank is completely consumed, forming a layer of hard stone plate by the slurry, wherein the slurry below the hard stone plate forms a super-viscous paste when the height of the hard stone plate is lower than that of the slurry before sealing, increasing and clarifying the clear liquid above the hard stone plate, and detecting that the pH value of the slurry is reduced to be less than 9.5;
s6, recycling the slurry: extracting supernatant from the slurry storage tank to expose the hard slate, breaking the hard slate with a light hammer, and grabbing the broken slate containing CaCO330-40% of the total weight, and the balance of Ca (OH)2And Si, Fe, Mg and other impurities, and the cement clinker is used after being fired;
paste in the stock chest is detected to contain CaCO375-80% of Ca (OH)215-20%, adding dried carbon powder into slurry storage tank, stirring, pressing into paste balls, drying until water content is less than 2%, breaking the paste balls, and calcining at 400 deg.C for 1 hr to produce CO2And consume Ca (OH)2Until the carbon powder is completely consumed, removing ash by air separation, and detecting the rest powder, wherein CaCO3The content is more than 95 percent and the grain diameter is not more than 200 nanometers, then the material is transferred to a lime kiln and is fired at 1050 ℃, and the superfine active calcium oxide with uniform grain diameter distribution and the grain diameter not more than 300 nanometers is obtained.
2. The method as claimed in claim 1, wherein CO is contained in the exhaust gas from lime kiln2The sealing and recycling method is characterized in that the vortex stirring paddle (3) has the following structure: the top end of the motor driving shaft is connected with a plurality of blades through a supporting rod, adjacent blades are connected in series through a ring, a spring ring is wound outside one circle of blades and forms a horizontal circle, and the circle center and the mixing tower (1) are concentrically arranged.
3. The method as claimed in claim 1, wherein CO is contained in the exhaust gas from lime kiln2The method for sealing and recycling is characterized in that the extruder (9) is a double-screw extruder and is provided with two opposite-direction rotating drivesAnd the motor is used for stirring and extruding the carbide slag.
4. The method as claimed in claim 1, wherein CO is contained in the exhaust gas from lime kiln2The method for sequestration and recycling is characterized in that the crusher (10) is a jaw crusher, and is used for crushing the carbide slag and further dissolving the wet carbide slag.
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| CN111717929A (en) * | 2020-07-10 | 2020-09-29 | 沈阳鑫博工业技术股份有限公司 | Carbide slag comprehensive utilization device and method |
| CN111747437A (en) * | 2020-07-29 | 2020-10-09 | 雅安正兴汉白玉股份有限公司 | Preparation process of ultrafine calcium carbonate powder |
| CN112573555A (en) * | 2020-12-11 | 2021-03-30 | 原初科技（北京）有限公司 | Carbide slag mineralization fixation of CO2And method for preparing fine calcium carbonate |
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