CN218424769U - Carbide slag slurry processing system - Google Patents
Carbide slag slurry processing system Download PDFInfo
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- CN218424769U CN218424769U CN202222418313.1U CN202222418313U CN218424769U CN 218424769 U CN218424769 U CN 218424769U CN 202222418313 U CN202222418313 U CN 202222418313U CN 218424769 U CN218424769 U CN 218424769U
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Abstract
The utility model provides a carbide slag slurry treatment system, which comprises a material distribution unit, a mixing and conveying unit, a spiral feeding unit, a rotary kiln digestion and drying unit and a screening unit which are connected in sequence; the distributing unit comprises a carbide slag mud distributing unit and a dry lime distributing unit; the rotary kiln digestion drying unit comprises a digestion section and a drying section, and the dried materials enter the screening unit to be subjected to particle size screening to obtain materials with different particle size grades. Through carbide slag mud cloth unit and dry lime cloth unit, mix carbide slag mud and dry lime, then utilize rotary kiln digestion drying system, with the help of lime digestion water absorption, exothermic and auxiliary heating drying, the moisture with carbide slag mud has fallen below 2%, and produced dry carbide sediment has possessed the condition of reprocessing high-efficient utilization, is showing to reduce moreover and handles the energy consumption.
Description
Technical Field
The utility model relates to a carbide slag handles technical field, especially relates to a carbide slag slurry processing system.
Background
The process for producing PVC by calcium carbide is divided into a dry method and a wet method. Hydrolyzing calcium carbide by a dry process to generate acetylene gas and calcium carbide slag containing 8-12 parts of water; the wet process hydrolyzes calcium carbide to produce acetylene gas and calcium carbide slag slurry. Carbide slag slurry containing 10% of solids, which is produced by a wet process, is concentrated and filter-pressed to produce carbide slag mud containing 25-40% of water, and the carbide slag mud is stored in a stacking form at present, so that the carbide slag mud occupies land, pollutes the environment and is basically unusable. Although a small amount of carbide slag is used in the production of building materials, the amount is limited. In order to transport and utilize the carbide slag mud with high water content, water is firstly removed, and the traditional water removing process comprises a steam drying method and an electrothermal drying method, so that the cost is high, and the product is not competitive. Therefore, how to select an energy-saving and environment-friendly comprehensive carbide slag slurry treatment system is a problem to be solved urgently.
In view of the above, there is a need for an improved carbide slag slurry processing system that solves the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a carbide slag slurry processing system, through carbide slag mud cloth unit and dry lime cloth unit, mix carbide slag mud and dry lime, then utilize rotary kiln digestion drying system, absorb water, release heat and auxiliary heating are dry with the help of lime digestion, fall to below 2% with the moisture of carbide slag mud, produced dry carbide slag has possessed the condition of reprocessing high-efficient utilization, is showing moreover and reduces the processing energy consumption.
In order to realize the purpose of the utility model, the utility model provides a carbide slag slurry treatment system, which comprises a material distribution unit, a mixed conveying unit, a spiral feeding unit, a rotary kiln digestion drying unit and a screening unit which are connected in sequence; the distributing unit comprises a carbide slag mud distributing unit and a dry lime distributing unit; the rotary kiln digestion drying unit comprises a digestion section and a drying section, and the dried materials enter the screening unit to be subjected to particle size screening to obtain materials with different particle size grades.
As a further improvement, the utility model discloses a still including the concentrated filter-pressing unit that connects gradually and preheat the unit for will contain solid 10% carbide slag thick liquid and concentrate and preheat, preheat the unit with carbide slag mud cloth unit connection.
As a further improvement, the utility model also comprises a heat preservation unit and a first conveying unit which are connected with the concentrated filter pressing unit, the first conveying unit comprises a scraper conveyor and a belt weigher and is used for feeding carbide slag into the preheating unit according to the measurement.
As a further improvement of the utility model, the temperature of the heat preservation unit is 20-30 ℃; the temperature of the preheating unit is 40-60 ℃, and the moisture content of the carbide slag mud is 25-45%.
As a further improvement of the utility model, the rotary kiln digestion and drying unit further comprises a heat exchanger and an superheated steam unit, wherein the heat exchanger is respectively connected with the digestion section and the drying section to form a circulation passage for feeding hot air into the digestion section to heat the mixed material; the superheated steam unit is used for sending superheated steam into the drying section to remove water from the mixed materials, and the generated condensed water is sent into the heat exchanger through the circulation passage.
As a further improvement of the utility model, a powder collector and an air conveying chute are arranged between the rotary kiln digestion drying unit and the screening unit; dust-containing hot gas generated by the rotary kiln digestion drying unit is sent to the dust remover; and the materials treated by the rotary kiln digestion drying unit and the powder in the dust remover enter the air conveying chute and are then conveyed to the screening unit.
As a further improvement, the hot flue gas after the dust remover removes dust is sent into the heat preservation unit and the preheating unit.
As a further improvement, the mixed conveying unit is a belt conveying unit, a mixing unit is further arranged between the mixed conveying unit and the spiral feeding unit and used for mixing carbide slag mud and dry lime powerfully.
As a further improvement of the utility model, the dry lime distributing unit comprises a dry lime bin, a metering scale and a distributing device which are connected in sequence.
As a further improvement of the present invention, the screening unit comprises:
the dry material bin is used for storing the dry material processed by the rotary kiln digestion drying unit;
the powder concentrator is connected with the dry material bin; used for screening fine powder with the granularity of less than 200 meshes, medium fine powder with the granularity of less than 40 meshes and coarse powder with the granularity of more than 40 meshes;
the first screening machine is used for screening the fine powder with the granularity of less than 200 meshes to generate ultrafine powder with the granularity of less than 325 meshes and fine powder with the granularity of 200-325 meshes;
the second screening machine is used for screening the medium fine powder with the granularity less than 40 meshes to generate fine powder with the granularity less than 200 meshes and medium fine powder with the granularity of 40-200 meshes; and mixing the fine powder with the granularity of less than 200 meshes with the fine powder with the granularity of 200-325 meshes to obtain a fine powder product.
The beneficial effects of the utility model are that:
1. the utility model provides a carbide slag slurry processing system, through carbide slag mud cloth unit and dry lime cloth unit, mix carbide slag mud and dry lime, then utilize rotary kiln digestion drying system, absorb water, exothermic and auxiliary heating drying with the help of lime digestion, the moisture with carbide slag mud has fallen below 2%, produced dry carbide slag has possessed the condition of reprocessing high-efficient utilization, is showing moreover to reduce the processing energy consumption.
2. The rotary kiln digestion drying unit is divided into a digestion section and a drying section, a heat exchanger is respectively connected with the digestion section and the drying section to form a circulation passage, and a superheated steam unit is connected with the drying section to provide heat for the superheated steam unit. And high-temperature condensed water generated in the drying section is sent to the heat exchanger through the circulating passage to heat the cold air. Hot flue gas generated by the rotary kiln digestion drying unit is sent into a heat preservation unit and a preheating unit, and a heating assembly of the heat preservation unit is preferably of an interlayer heat preservation structure which is provided with a flue gas inlet and an exhaust port; the hot flue gas inlet is sent into the interlayer heat-insulating structure to realize the heat insulation of the carbide slag mud. By the arrangement, two groups of circulating closed heat exchange loops are formed, heat in the treatment system can be fully utilized, and energy consumption is reduced.
Drawings
Fig. 1 is a block diagram of the carbide slag slurry treatment system of the present invention.
Fig. 2 is a block diagram of the digestion and drying unit of the rotary kiln shown in fig. 1.
Fig. 3 is a block diagram of the components of the screening unit of fig. 1.
Fig. 4 is a schematic view of the specific process flow of the carbide slag slurry treatment system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is described in detail with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the specific embodiments, and other details not relevant to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1-3, the utility model provides a carbide slag slurry processing system, which comprises a material distribution unit, a mixing and conveying unit, a spiral feeding unit, a rotary kiln digestion and drying unit and a screening unit, which are connected in sequence; the material distribution unit comprises a carbide slag mud material distribution unit and a dry lime material distribution unit; the rotary kiln digestion drying unit comprises a digestion section and a drying section, and the dried materials enter a screening unit for screening the granularity to obtain materials with different granularity levels; wherein the mass ratio of the carbide slag mud to the dry lime is 4 percent to 90-10 percent to 96 percent. So set up, on the one hand, mix carbide slag mud and a small amount of dry lime, can utilize the moisture in lime slaking water absorption and the partial carbide slag mud of exothermic absorption to turn into calcium hydrate, reduce heat consumption. On the other hand, the rotary kiln digestion drying unit is adopted for digestion and drying, so that heat conversion of materials is facilitated, heat loss is reduced, and energy consumption is reduced.
Particularly, the carbide slag slurry treatment system also comprises a concentration filter-pressing unit and a preheating unit which are sequentially connected, and the concentration filter-pressing unit and the preheating unit are used for concentrating and preheating carbide slag slurry containing 10% of solids to obtain carbide slag slurry with the water content of 25-45%. The preheating unit is connected with the carbide slag distributing unit. The temperature of the preheating unit is 40-60 ℃. The carbide slag is preheated by the preheating unit and then mixed with the dry lime, so that the temperature difference between the carbide slag and the dry lime is reduced, and preliminary mixing digestion is realized.
The mixed conveying unit is preferably a belt conveying unit, the carbide slag mud and the dry lime are distributed on a conveying belt in a layered and staggered mode according to the proportion, the length of the conveying belt is 2-10m, and the acetylene in the carbide slag mud is emitted through conveying by the conveying belt; and the two are uniformly mixed by layering and staggered arrangement. In some embodiments, a mixing unit, such as an intensive mixer, is further disposed between the mixing and conveying unit and the screw feeding unit for intensively mixing the carbide slag sludge and the dry lime. The dry lime distributing unit comprises a dry lime bin, a metering scale and a distributing device which are connected in sequence.
The carbide slag slurry treatment system also comprises a heat preservation unit and a first conveying unit which are connected with the concentration and filter pressing unit, wherein the first conveying unit comprises a scraper conveyor and a belt scale and is used for conveying carbide slag slurry into the preheating unit according to the measurement. The temperature of the heat preservation unit is 20-30 ℃. The acetylene gas in the carbide slag mud can be partially removed through the transportation of the scraper conveyor.
The rotary kiln digestion drying unit also comprises a heat exchanger and a superheated steam unit, wherein the heat exchanger is respectively connected with the digestion section and the drying section to form a circulation passage for feeding hot air at 90-130 ℃ into the digestion section to heat the mixed material; the superheated steam unit is used for sending the superheated steam generated by industrial waste heat at 180 ℃ into the drying section to remove water from the mixed material, and the generated 120 ℃ high-temperature condensed water is sent into the heat exchanger through the circulating passage to heat the cold air. A powder collector and an air conveying chute are also arranged between the rotary kiln digestion drying unit and the screening unit; dust-containing hot gas generated by the rotary kiln digestion drying unit is sent to a dust remover; the materials treated by the rotary kiln digestion drying unit and the powder in the dust remover enter an air conveying chute and then are conveyed to a screening unit. The hot flue gas dedusted by the deduster is sent to the heat preservation unit and the preheating unit. The heating assembly of the heat preservation unit is preferably of an interlayer heat preservation structure, and the interlayer heat preservation structure is provided with a flue gas inlet and an exhaust port; the hot flue gas inlet is sent into the interlayer heat-insulating structure, so that the heat insulation of the carbide slag mud is realized. By the arrangement, two groups of circulating closed heat exchange loops are formed, heat in the treatment system can be fully utilized, and energy consumption is reduced.
Referring to fig. 4, the carbide slag slurry treatment process provided by the present invention is as follows: in the process for producing PVC by calcium carbide wet method, calcium carbide slurry containing 90% of water generated by calcium carbide hydrolysis is concentrated and filtered to obtain calcium carbide slurry containing 25-45% of water.
The carbide slag mud is injected into a heat-insulating material pool, is sent into a belt weigher through a scraper machine, is sent into a preheating section through metering to heat the slag charge to 40-60 ℃, and is sent into a carbide slag mud distributing device after being heated. And dry lime in the storage bin is fed into the dry lime distributing device through the rotor scale, the carbide slag mud distributing device and the dry lime distributing device distribute carbide slag mud and the dry lime on a conveying belt in a layered and staggered mode according to the proportion to realize premixing, and the carbide slag mud is mixed with 4-10% of the dry lime and 90-96% of the dry lime mud according to the proportion.
The premix is fed into a mixing stirrer, and the carbide slag is smashed and fully contacted with lime particles through strong stirring, so that water transfer and preliminary digestion are realized. And (4) feeding the uniformly mixed semi-digested material into the rotary kiln through a screw feeder. Hot air heated by a heat exchanger and having a temperature of 90-130 ℃ is fed into the left side of the rotary kiln, and is mixed with the material fed by the screw feeder in the front half section of the rotary kiln, and the temperature of the front half section is controlled to be in a range of 60-90 ℃ to realize accelerated digestion. And introducing superheated steam generated by industrial waste heat at 180 ℃ into the latter half section of the rotary kiln, and drying the superheated steam to reduce the water content of the slag to be below 2%. The high-temperature condensed water at 120 ℃ and a small amount of steam generated in the drying section are sent to a heat exchanger 13 to heat the cold air, and the temperature of the cold air is raised to 90-130 ℃ by heating. The hot gas with 100 ℃ generated by the rotary kiln is sent to a dust collector for dust collection, and the hot flue gas after dust collection is sent to a preheating section and an interlayer of the carbide mud heat-preservation material pool for preheating two materials.
The powder collected by the dust remover and the rotary kiln discharge fall into an air chute, the dry powder is sent to a bucket elevator through the air chute, and the dry powder is sent to a dry slag bin for storage through the bucket elevator. The dry residue bin is sent to a powder separator, and fine powder with the granularity of less than 200 meshes, medium fine powder with the granularity of less than 40 meshes and coarse powder with the granularity of more than 40 meshes are produced after separation.
Sieving the fine powder with the granularity of less than 200 meshes by a sieving machine 19 to generate ultrafine powder with the granularity of less than 325 meshes and fine powder with the granularity of 200-325 meshes; sieving the medium fine powder with the granularity of less than 40 meshes by a sieving machine 20 to generate fine powder with the granularity of less than 200 meshes, mixing the fine powder with the fine powder of 200-325 meshes to obtain a fine powder product and medium fine powder of 40-200 meshes; the coarse material with the grain size of less than 40 meshes is sent to a grinder after silicon iron is sorted. The superfine powder, the fine powder and the medium fine powder can be compounded into a final product through 21 and 22 mixing links according to the application.
To sum up, the utility model provides a carbide slag slurry processing system through carbide slag mud cloth unit and dry lime cloth unit, mixes carbide slag mud and dry lime, then utilizes rotary kiln digestion drying system, absorbs water, releases heat and the auxiliary heating is dry with the help of lime digestion, has fallen the moisture of carbide slag mud below 2%, and produced dry carbide slag has possessed the condition of reprocessing high-efficient utilization, is showing moreover and reduces the processing energy consumption. Through the two groups of circulating closed heat exchange loops, the heat in the treatment system can be fully utilized, and the energy consumption is further reduced.
Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and equivalent arrangements can be made without departing from the spirit and scope of the present invention.
Claims (10)
1. A carbide slag slurry treatment system is characterized by comprising a material distribution unit, a mixing and conveying unit, a spiral feeding unit, a rotary kiln digestion and drying unit and a screening unit which are sequentially connected; the distribution unit comprises a carbide slag mud distribution unit and a dry lime distribution unit; the rotary kiln digestion drying unit comprises a digestion section and a drying section, and the dried materials enter the screening unit to be subjected to particle size screening to obtain materials with different particle size grades.
2. The carbide slag slurry processing system according to claim 1, further comprising a concentration and pressure filtration unit and a preheating unit connected in sequence for concentrating and preheating carbide slag slurry containing 10% of solids, wherein the preheating unit is connected with the carbide slag slurry distributing unit.
3. The carbide slag slurry treatment system according to claim 2, further comprising a heat preservation unit and a first conveying unit connected to the concentration and pressure filtration unit, the first conveying unit comprising a scraper and a belt scale for conveying carbide slag slurry into the preheating unit in a metered amount.
4. The carbide slag slurry treatment system according to claim 3, wherein the temperature of the heat-preserving unit is 20-30 ℃; the temperature of the preheating unit is 40-60 ℃, and the moisture content of the carbide slag mud is 25-45%.
5. The carbide slag slurry treatment system according to claim 3, wherein the rotary kiln digestion drying unit further comprises a heat exchanger and a superheated steam unit, the heat exchanger is respectively connected with the digestion section and the drying section to form a circulation passage for feeding hot air into the digestion section to heat the mixed material; the superheated steam unit is used for sending superheated steam into the drying section to remove water from the mixed materials, and the generated condensed water is sent into the heat exchanger through the circulating passage.
6. The carbide slag slurry processing system according to claim 5, wherein a powder collector and an air delivery chute are further arranged between the rotary kiln digestion drying unit and the screening unit; dust-containing hot gas generated by the rotary kiln digestion drying unit is sent to a dust remover; and the materials treated by the rotary kiln digestion drying unit and the powder in the dust remover enter the air conveying chute and are then conveyed to the screening unit.
7. The carbide slag slurry processing system according to claim 6, wherein the hot flue gas dedusted by the deduster is fed into the heat preservation unit and the preheating unit.
8. The carbide slag slurry processing system of claim 1, wherein the mixing and conveying unit is a belt conveying unit, and a mixing unit is further disposed between the mixing and conveying unit and the spiral feeding unit for intensively mixing carbide slag sludge and dry lime.
9. The carbide slag slurry processing system according to claim 1, wherein the dry lime distribution unit comprises a dry lime bin, a weigher and a distributor connected in sequence.
10. The carbide slag slurry treatment system of claim 1, wherein the screening unit comprises:
the dry material bin is used for storing the dry material processed by the rotary kiln digestion drying unit;
the powder concentrator is connected with the dry material bin; used for screening fine powder with the granularity of less than 200 meshes, medium fine powder with the granularity of less than 40 meshes and coarse powder with the granularity of more than 40 meshes;
the first screening machine is used for screening the fine powder with the granularity of less than 200 meshes to generate ultrafine powder with the granularity of less than 325 meshes and fine powder with the granularity of 200-325 meshes;
the second screening machine is used for screening the medium fine powder with the granularity of less than 40 meshes to generate fine powder with the granularity of less than 200 meshes and medium fine powder with the granularity of 40-200 meshes; and mixing the fine powder with the granularity of less than 200 meshes with the fine powder with the granularity of 200-325 meshes to obtain a fine powder product.
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| CN202222418313.1U CN218424769U (en) | 2022-09-13 | 2022-09-13 | Carbide slag slurry processing system |
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| CN202222418313.1U CN218424769U (en) | 2022-09-13 | 2022-09-13 | Carbide slag slurry processing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115446075A (en) * | 2022-09-13 | 2022-12-09 | 山西中瑞瑞恒建材有限公司 | Carbide slag slurry treatment system and treatment process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115446075A (en) * | 2022-09-13 | 2022-12-09 | 山西中瑞瑞恒建材有限公司 | Carbide slag slurry treatment system and treatment process |
| CN115446075B (en) * | 2022-09-13 | 2024-05-17 | 山西中瑞瑞恒建材有限公司 | Carbide slag slurry treatment system and treatment process |
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