CN115446075A - Carbide slag slurry treatment system and treatment process - Google Patents
Carbide slag slurry treatment system and treatment process Download PDFInfo
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- CN115446075A CN115446075A CN202211110784.4A CN202211110784A CN115446075A CN 115446075 A CN115446075 A CN 115446075A CN 202211110784 A CN202211110784 A CN 202211110784A CN 115446075 A CN115446075 A CN 115446075A
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- 239000002893 slag Substances 0.000 title claims abstract description 134
- 239000002002 slurry Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000029087 digestion Effects 0.000 claims abstract description 64
- 238000001035 drying Methods 0.000 claims abstract description 64
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 52
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 52
- 239000004571 lime Substances 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000012216 screening Methods 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 62
- 238000004321 preservation Methods 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 230000004087 circulation Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 239000002440 industrial waste Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000011085 pressure filtration Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 238000012958 reprocessing Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 17
- 239000005997 Calcium carbide Substances 0.000 description 9
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 6
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 5
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 5
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
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- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/32—Compressing or compacting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
- B09B3/45—Steam treatment, e.g. supercritical water gasification or oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
Abstract
The invention provides a carbide slag slurry treatment system and a carbide slag slurry treatment process, which comprise 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 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 for particle size screening to obtain materials with different particle size grades; the mass ratio of the carbide slag mud to the dry lime is 4 percent to 90-10 percent to 96 percent. According to the method, the method for mixing the dry lime in the carbide slag mud is adopted, the rotary kiln digestion drying system is utilized, the moisture of the carbide slag mud is reduced to below 2% through lime digestion water absorption, heat release and auxiliary heating drying, the generated dry carbide slag has the condition of reprocessing and efficient utilization, and the treatment energy consumption can be obviously reduced.
Description
Technical Field
The invention relates to the technical field of carbide slag treatment, in particular to a carbide slag slurry treatment system and a treatment process.
Background
The main components of the carbide slag solid phase are CaO (65-70 percent) and SiO 2 (2-3%) and inert substance (Al) 2 O 3 、Fe 2 O 3 、CaC 2 Etc) (1-2%) belonging to general industrial solid waste. The waste carbide slag not only occupies land resources, but also pollutes surrounding underground water, soil and air after being piled for a long time.
At present, carbide slag mainly has a plurality of treatment ways: firstly, dry slag formed by dewatering carbide slag is used as a production raw material of building materials such as cement, building materials for roadbeds and the like; replacing quicklime after purifying and filtering the carbide slag to be used as a desulfurizer of a desulfurization system of a power plant and a heat supply boiler; thirdly, the carbide slag is used as a neutralizing agent for sewage treatment. After the carbide slag is dehydrated and pulverized, the calcium hydroxide dry powder desulfurizer is prepared to replace quicklime and is used as a desulfurizer for wet, dry and semi-dry desulphurization in a power plant. The method can treat the pollution of the carbide slag, can recycle effective components in the carbide slag, can greatly reduce the desulfurization cost of enterprises, and the separated coarse slag can be used as a building material for roadbeds and a waste water neutralizer. Good environmental benefit, economic benefit and social benefit can be generated after the project is implemented.
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 calcium carbide is hydrolyzed to generate 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.
In view of the above, there is a need for an improved carbide slag slurry processing system and process that solves the above-mentioned problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a carbide slag slurry treatment system and a treatment process, wherein the method for mixing dry lime in carbide slag mud is adopted, and a rotary kiln digestion and drying system is utilized, so that the moisture of the carbide slag mud is reduced to be below 2% through lime digestion water absorption, heat release and auxiliary heating and drying, the generated dry carbide slag has the conditions of reprocessing and efficient utilization, and the treatment energy consumption is obviously reduced.
In order to realize the aim, the invention 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 sequentially connected; 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 for particle size screening to obtain materials with different particle size grades; the mass ratio of the carbide slag mud to the dry lime is 4 percent to 90-10 percent to 96 percent.
As a further improvement of the invention, the carbide slag distribution device further comprises a concentration filter pressing unit and a preheating unit which are sequentially connected, wherein the concentration filter pressing unit and the preheating unit are used for concentrating and preheating carbide slag slurry containing 10% of solids, and the preheating unit is connected with the carbide slag distribution unit.
As a further improvement of the invention, the device also comprises a heat preservation unit and a first conveying unit which are connected with the concentration and pressure filtration unit, wherein the first conveying unit comprises a scraper conveyor and a belt scale and is used for conveying the carbide slag into the preheating unit according to the measurement; 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 invention, the rotary kiln digestion drying unit further 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 sending 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 invention, 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 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 of the invention, the hot flue gas dedusted by the deduster is sent to the heat preservation unit and the preheating unit.
As a further improvement of the invention, the mixing and conveying unit is a belt conveying unit, and a mixing unit is arranged between the mixing and conveying unit and the spiral feeding unit and used for strongly mixing the carbide slag mud 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.
As a further development of the 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 superfine 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.
A carbide slag slurry treatment process, which adopts any one of the carbide slag slurry treatment systems, comprises the following steps:
carrying out concentration and filter pressing on the carbide slag slurry containing more than 90% of water to obtain carbide slag mud containing 25-45% of water;
conveying the carbide slag mud into a belt scale through a scraper conveyor, then conveying the carbide slag mud into a preheating unit according to the measurement, heating the carbide slag mud to 40-60 ℃, and then conveying the carbide slag mud into a carbide slag mud distribution unit;
the dry lime is fed into a dry lime distributing unit according to the measurement, and the carbide slag mud distributing unit and the dry lime distributing unit distribute the carbide slag mud and the dry lime in a belt conveying unit in a layered and staggered manner to realize premixing;
feeding the premix into a rotary kiln digestion drying unit through a screw feeder, and obtaining powder after digestion and drying;
and screening the powder material to obtain materials with different granularity levels.
As a further improvement of the invention, the premix is stirred strongly to break the carbide slag mud and fully contact with the lime particles, so as to realize water transfer and preliminary digestion, and then the carbide slag mud is fed into a screw feeder;
the powder comprises the powder discharged by the rotary kiln and separated by a dust remover; the powder is sequentially conveyed into a screening unit through an air conveying chute and a bucket elevator;
the rotary kiln digestion drying unit controls the temperature of a digestion section to be 60-90 ℃ through hot air; introducing superheated steam generated by industrial waste heat at 180 ℃ into the drying section to reduce the water content of the slag charge to below 2%; and the high-temperature condensed water at 120 ℃ and a small amount of steam generated in the drying section are sent into a heat exchanger to heat cold air.
The invention has the beneficial effects that:
1. according to the carbide slag slurry treatment system and the treatment process provided by the invention, on one hand, carbide slag slurry is mixed with a small amount of dry lime, and partial moisture in the carbide slag slurry can be absorbed by utilizing lime digestion and water absorption and heat release to be converted into calcium hydroxide, so that the heat consumption is reduced. On the other hand, the rotary kiln digestion and 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.
2. The rotary kiln digestion and 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. High-temperature condensed water generated in the drying section is sent to the heat exchanger through the circulation passage to heat 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.
3. According to the invention, the carbide slag is preheated by the preheating unit and then distributed on the conveying belt in a layered and staggered manner, so that the carbide slag and the dry lime are conveyed and mixed, the temperature difference between the carbide slag and the dry lime can be reduced, the mixing uniformity is improved, the preliminary mixing digestion is realized, and the acetylene gas diffusion can be promoted.
4. The complete process of the invention can be used for processing the carbide slag mud, and the product meets the wide requirements of metallurgy, chemical industry and environmental protection industry.
Drawings
Fig. 1 is a block diagram of the components of a carbide slag slurry processing system according to 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 block diagram of a carbide slag slurry processing system in an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below 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 scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it should be further 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 to 3, the carbide slag slurry treatment system provided by the present invention includes 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 among the partial carbide slag mud of lime digestion water absorption and exothermic absorption to turn into calcium hydroxide, 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 mud is preheated by the preheating unit and then mixed with the dry lime, so that the temperature difference between the carbide slag mud 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 manner according to a proportion, the length of the conveying belt is 2-10m, and acetylene in the carbide slag mud is emitted out through conveying of 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 spiral feeding unit for intensively mixing the carbide slag mud and the dry lime. The dry lime distributing unit comprises a dry lime bin, a metering scale and a distributing device which are sequentially connected.
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 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.
In the embodiment of the process for producing PVC by calcium carbide wet process, calcium carbide slurry containing 90% of water generated by calcium carbide hydrolysis is concentrated and filter-pressed to obtain calcium carbide slurry containing 25-45% of water. The carbide slag mud is mainly composed of Ca (OH) 2 Composition, since the water content is too high, ca (OH) is produced using it as a raw material 2 The cost is high. Carbide slag mud contains excessive water, and lime digestion requires a large amount of water and releases heat, so that if proper amount of dry lime is mixed with carbide slag mud, the water content of the total product can be reduced, and the conversion rate and the conversion speed can be ensured under certain conditions, thereby realizing large-scale continuous production. Referring to fig. 4, the carbide slag slurry treatment process provided by the present invention specifically comprises:
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 the 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 within the 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 to collect dust, 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 to preheat two materials.
The powder collected by the dust remover and the discharged material of the rotary kiln 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 slag bin material is sent to a powder selecting machine, 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 generated after the dry slag bin material is selected.
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; and (4) sorting ferrosilicon from coarse materials with the granularity of less than 40 meshes and then feeding the ferrosilicon into a mill. 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.
In summary, according to the carbide slag slurry treatment system and the treatment process provided by the invention, carbide slag slurry and dry lime are mixed through the carbide slag slurry distribution unit and the dry lime distribution unit, and then the moisture of the carbide slag slurry is reduced to below 2% by utilizing the rotary kiln digestion drying system and by means of lime digestion water absorption, heat release and auxiliary heating drying, so that the generated dry carbide slag has the condition of reprocessing and efficient utilization, and the treatment energy consumption is obviously reduced. Through the closed heat exchange loops of the two groups of circulations, 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, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof 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 connected in sequence; 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 for particle size screening to obtain materials with different particle size grades; the mass ratio of the carbide slag mud to the dry lime is 4% to 90-10% to 96%.
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 of 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 conveyor and a belt scale for conveying carbide slag slurry into the preheating unit in a metered amount; 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%.
4. 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 circulation passage.
5. The carbide slag slurry processing system according to claim 4, 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 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.
6. The carbide slag slurry processing system according to claim 5, wherein the hot flue gas dedusted by the deduster is fed into the heat preservation unit and the preheating unit.
7. The carbide slag slurry processing system according to claim 1, wherein the mixing and conveying unit is a belt conveying unit, and a mixing unit is further arranged between the mixing and conveying unit and the spiral feeding unit and used for strongly mixing carbide slag mud and dry lime; the dry lime distributing unit comprises a dry lime bin, a metering scale and a distributing device which are connected in sequence.
8. 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 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.
9. A carbide slag slurry treatment process characterized by employing the carbide slag slurry treatment system according to any one of claims 1 to 8, comprising the steps of:
carrying out concentration and filter pressing on the carbide slag slurry containing more than 90% of water to obtain carbide slag mud containing 25-45% of water;
the method comprises the following steps of (1) conveying the carbide slag into a belt scale through a scraper conveyor, then conveying the carbide slag into a preheating unit according to the measurement, heating to 40-60 ℃, and then conveying the carbide slag into a carbide slag distributing unit;
the dry lime is fed into a dry lime distributing unit according to the measurement, and the carbide slag mud distributing unit and the dry lime distributing unit distribute the carbide slag mud and the dry lime in a belt conveying unit in a layered and staggered manner to realize premixing;
feeding the premix into a rotary kiln digestion drying unit through a screw feeder, and obtaining powder after digestion and drying;
and screening the powder material to obtain materials with different granularity levels.
10. The carbide slag slurry processing system according to claim 9, wherein the premixed material is stirred vigorously to break the carbide slag slurry and fully contact with the lime particles, so as to realize water transfer and preliminary digestion, and then the water is fed into the screw feeder;
the powder comprises the discharged material of the rotary kiln and the powder separated by the dust remover; the powder is sequentially conveyed into a screening unit through an air conveying chute and a bucket elevator;
the rotary kiln digestion drying unit controls the temperature of a digestion section to be 60-90 ℃ through hot air; introducing superheated steam generated by industrial waste heat at 180 ℃ into the drying section to reduce the water content of the slag charge to below 2%; and the high-temperature condensed water at 120 ℃ and a small amount of steam generated in the drying section are sent into a heat exchanger to heat cold air.
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