CN118343761A - Method for preparing calcium carbide by using carbide slag - Google Patents
Method for preparing calcium carbide by using carbide slag Download PDFInfo
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- CN118343761A CN118343761A CN202410590046.7A CN202410590046A CN118343761A CN 118343761 A CN118343761 A CN 118343761A CN 202410590046 A CN202410590046 A CN 202410590046A CN 118343761 A CN118343761 A CN 118343761A
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- kiln
- carbide slag
- carbide
- air outlet
- calcium carbide
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- 239000002893 slag Substances 0.000 title claims abstract description 94
- 239000005997 Calcium carbide Substances 0.000 title claims abstract description 66
- 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 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001035 drying Methods 0.000 claims abstract description 65
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000000292 calcium oxide Substances 0.000 claims abstract description 19
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 19
- 238000001354 calcination Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 239000000571 coke Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000013590 bulk material Substances 0.000 claims description 33
- 239000007789 gas Substances 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 230000001502 supplementing effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 7
- 238000004134 energy conservation Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011165 process development Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of carbide slag recycling, in particular to a method for preparing calcium carbide by using carbide slag, which comprises the following steps: removing impurities, namely removing internal impurities from carbide slag; drying, namely drying the carbide slag subjected to impurity removal by using a drying kiln; calcining, namely calcining the dried carbide slag by using a rotary kiln to obtain quicklime; proportioning, namely mixing calcined quicklime with coke according to a certain proportion to obtain a calcium carbide raw material; smelting, namely conveying calcium carbide raw materials to a calcium carbide furnace, and smelting the calcium carbide raw materials in the calcium carbide furnace to obtain a calcium carbide finished product; and the kiln tail air flow of the rotary kiln in the calcination process is connected into the air flow of the air inlet of the drying kiln in the drying process, so that the carbide slag is dried. The invention realizes the improvement of the process for preparing the calcium carbide from the calcium carbide slag, and achieves the aims of recycling the residual energy consumption and promoting the development of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of carbide slag recycling, in particular to a method for preparing calcium carbide by using carbide slag.
Background
The carbide slag is industrial waste slag discharged in the process of preparing acetylene by using the PVC method, and the process development is rapid in recent years, so that a large amount of carbide slag is also generated. About 1.2 tons of carbide slag is produced by 1 ton of carbide. The carbide slag is alkaline and can cause damage to the environment if not properly treated.
In the prior art, the disposal and utilization of the calcium carbide waste residue mainly comprises sea filling, ditch filling, regular stacking, natural sedimentation, and the like, and the calcium carbide waste residue is used for replacing limestone to prepare cement, producing quicklime to be used as a calcium carbide raw material, producing chemical products, producing building materials, environmental treatment and the like.
At present, the team mainly uses calcium carbide slag as a raw material to prepare quicklime, and uses the quicklime as the raw material to prepare calcium carbide (calcium carbide), so that the energy consumption problem in the whole process from the calcium carbide slag to the calcium carbide is solved, and the aim of recycling residual energy consumption and promoting energy conservation and emission reduction is fulfilled to develop the improvement of the process.
Disclosure of Invention
The invention aims at: the method for preparing the calcium carbide by using the carbide slag is provided, the process improvement of preparing the calcium carbide by using the carbide slag is realized, and the aims of recycling the residual energy consumption and promoting the development of energy conservation and emission reduction are fulfilled.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the method for preparing the calcium carbide by using the carbide slag comprises the following steps:
Removing impurities, namely removing internal impurities from carbide slag;
drying, namely drying the carbide slag subjected to impurity removal by using a drying kiln;
calcining, namely calcining the dried carbide slag by using a rotary kiln to obtain quicklime;
proportioning, namely mixing calcined quicklime with coke according to a certain proportion to obtain a calcium carbide raw material;
smelting, namely conveying calcium carbide raw materials to a calcium carbide furnace, and smelting the calcium carbide raw materials in the calcium carbide furnace to obtain a calcium carbide finished product;
and the kiln tail air flow of the rotary kiln in the calcination process is connected into the air flow of the air inlet of the drying kiln in the drying process, so that the carbide slag is dried.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: and a temperature controller for adjusting the temperature of the air flow is arranged on a pipeline of kiln tail gas of the rotary kiln, which is connected to the air inlet of the drying kiln.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the temperature controller comprises a furnace body, the furnace body is provided with a furnace chamber, an air inlet, an air supplementing opening, an air outlet and a temperature sensor, air flows into the air inlet and flows out from the air supplementing opening after passing through the furnace chamber, a natural gas combustion furnace is arranged in the furnace chamber, the temperature sensor is arranged at the air outlet for detecting the air flow outlet temperature of the air outlet, a fan is arranged at the air outlet, the fan rotates along with the air flow outlet, the air supplementing opening is communicated with the furnace chamber, and a controller for controlling the air flow is arranged on the air supplementing opening.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the rotary kiln is characterized in that a first screw feeder is arranged at a feed inlet of the rotary kiln, and a feed inlet of the first screw feeder is in butt joint with a drying bin for storing dry carbide slag.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the dry carbide slag flowing out of the blanking port of the drying kiln is conveyed to a first storage bin through a first conveyor for storage, the first storage bin is provided with a second conveyor which extends to the drying bin, and the drying bin is provided with a detection device for detecting carbide slag allowance in the drying bin.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the drying kiln comprises a kiln body, wherein a feed inlet is formed in the top of the kiln body, a discharge outlet is formed in the bottom of the kiln body, an air outlet channel extending from the bottom to the top is formed in the kiln body, a space is reserved between the bottom end of the air outlet channel and the discharge outlet, and the top end of the air outlet channel extends to the outside of the kiln body; the kiln comprises a kiln body, and is characterized in that a plurality of first bulk material plates and a plurality of second bulk material plates are arranged in the kiln body in a staggered manner in the vertical direction, wherein the first bulk material plates are arranged in the top end direction of the interior of the kiln body, the first bulk material plates are annular, the upper parts of the first bulk material plates are connected with the outer side wall of an air outlet channel in a sealing manner, the lower parts of the first bulk material plates are dispersed towards the direction away from the outer side wall of the air outlet channel and are in a horn shape with the large ends facing downwards, and gaps are reserved between the lower parts of the first bulk material plates and the inner wall of the kiln body; a second bulk cargo plate is arranged below the first bulk cargo plate, the second bulk cargo plate is annular, the upper part of the second bulk cargo plate is in sealing connection with the inner wall of the kiln body, the lower part of the second bulk cargo plate is folded towards the outer wall of the air outlet channel and is in a horn shape with the large end upwards, and a gap is reserved between the lower part of the second bulk cargo plate and the outer wall of the air outlet channel; an air inlet channel communicated between the inner wall of the kiln body and the outer wall of the air outlet channel from the upper part of the kiln body is arranged outside the kiln body, and the air inlet channel is used for being connected with kiln tail air flow of the rotary kiln through a pipeline; the carbide slag to be dried is thrown into the kiln body from the feed inlet, the carbide slag entering the kiln body is dispersed by the first bulk material plate and naturally falls downwards, the carbide slag falls into the second bulk material plate after passing through the first bulk material plate in the natural falling process, and then falls into the next first bulk material plate, and the carbide slag is reciprocated until reaching the discharge hole; and kiln tail air flow of the rotary kiln flows from the upper part of the kiln body to the lower part after entering the kiln body from the air inlet channel, dries carbide slag, and air flow from the lower part of the kiln body enters the air outlet channel from the bottom end of the air outlet channel and flows upwards.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: and a spiral discharging machine is arranged at the discharging hole of the kiln body.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the air outlet channel bottom is provided with first baffle plates and second baffle plates staggered in the vertical direction, the first baffle plates are arranged on opposite sides of the second baffle plates, the upper parts of the first baffle plates are connected with the inside of the air outlet channel, the lower parts of the first baffle plates are inclined towards the direction away from the inner wall of the air outlet channel, and the lower parts of the first baffle plates and the second baffle plates are staggered in the vertical direction.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the upper part of the air outlet channel is provided with a dust removing filter screen structure.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: and the air flow discharged by the air outlet channel is purified by a bag-type dust remover.
In order to realize the process improvement of preparing calcium carbide from calcium carbide slag and complete the research and development targets of reutilization of residual energy consumption and promotion of energy conservation and emission reduction, the invention has the following advantages:
According to the method for preparing calcium carbide by using carbide slag, the calcium carbide slag raw material is dried and then calcined into quick lime, and the quick lime is taken as the raw material to further complete the calcium carbide, so that the closed loop of the process for preparing the calcium carbide by using the carbide slag is completed.
The kiln tail gas flow of the rotary kiln in the calcination process is connected into the drying kiln gas inlet gas flow in the drying process for drying the carbide slag, so that single hot gas flow feeding is not needed for drying the carbide slag, the recycling of the kiln tail gas flow of the rotary kiln is realized, and the environment-friendly aim of promoting energy conservation and emission reduction is fulfilled.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
FIG. 1 is a schematic process flow diagram of a method for preparing calcium carbide by using carbide slag;
FIG. 2 is a schematic diagram of a drying kiln according to the present invention;
FIG. 3 is a schematic diagram of a temperature controller according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more fully hereinafter with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention.
Referring to fig. 1-3, the invention discloses a method for preparing calcium carbide by using carbide slag, which is characterized in that the calcium carbide is prepared by using carbide slag raw materials (main components comprise calcium hydroxide), the carbide slag raw materials are dried and then calcined into quicklime (calcium oxide), and the quicklime is taken as raw materials to further complete the calcium carbide, so that the closed loop of the process for preparing the calcium carbide by using the carbide slag is completed.
In an embodiment of the present disclosure, specifically, a method for preparing calcium carbide using carbide slag includes:
Removing impurities, namely removing internal impurities from carbide slag;
Drying, namely drying the carbide slag subjected to impurity removal by using a drying kiln 100;
Calcining, namely calcining the dried carbide slag by using a rotary kiln 200 to obtain quicklime;
proportioning, namely mixing calcined quicklime with coke according to a certain proportion to obtain a calcium carbide raw material;
Smelting, namely conveying calcium carbide raw materials to a calcium carbide furnace 300, and smelting the calcium carbide raw materials in the calcium carbide furnace 300 to obtain a calcium carbide finished product;
the kiln tail gas flow of the rotary kiln 200 in the calcination process is connected into the inlet gas flow of the drying kiln 100 in the drying process for drying carbide slag.
Among them, the means of calcining quicklime with calcium hydroxide and mixing quicklime with coke and then preparing calcium carbide with the calcium carbide furnace 300 are not described in detail herein. However, it is worth noting that the method for preparing the calcium carbide by using the carbide slag realizes recycling and reutilizing the kiln tail gas flow of the rotary kiln 200 by connecting the kiln tail gas flow of the rotary kiln 200 in the calcination process to the gas flow of the drying kiln 100 in the drying process for drying the carbide slag, so that the drying of the carbide slag does not need single hot gas flow supply, and the environmental protection aims of promoting energy conservation and emission reduction are fulfilled.
Wherein, because the source of the carbide slag raw material is clear, the impurity removal step is mainly to treat the carbide slag by sieving and magnetic separation.
In the embodiment of the disclosure, a temperature controller 700 for adjusting the temperature of the air flow is disposed on a pipeline of the kiln tail gas of the rotary kiln 200 connected to the air inlet of the drying kiln 100. The average temperature of the gas exhausted from the tail gas of the lime kiln is 230-260 ℃, and when the drying kiln 100 is restarted to dry carbide slag after stopping the kiln, the temperature rise can be regulated by the temperature controller 700 to preheat the drying furnace, or the temperature of the drying air flow can be regulated and controlled according to the requirement in the drying process.
In this disclosed embodiment, the temperature controller 700 includes a furnace body 701, the furnace body 701 has a furnace 702, an air inlet 703, an air compensating port 704, an air outlet 705 and a temperature sensor 706, the air inlet 703 enters the furnace 702 and flows out from the air compensating port 704, a natural gas combustion furnace 707 is arranged in the furnace 702, the temperature sensor 706 is arranged at an air outlet to be used for detecting the air flow out temperature of the air outlet, a fan 708 is arranged at the air outlet, the fan 708 rotates along with the air flow out air outlet, the air compensating port 704 is communicated with the furnace 702, and a controller 709 for controlling the air flow is arranged on the air compensating port 704. When heating of the air stream that enters the kiln 100 is required, the air stream may be heated by calcination in the natural gas burner 707. If cooling is required, the controller 709 controls the opening size of the air supply port 704 to realize cooling of the air at normal temperature. Wherein the temperature sensor 706 is configured to detect a regulated air flow temperature.
In the embodiment of the disclosure, a first screw feeder 201 is arranged at a feed inlet of the rotary kiln 200, and a feed inlet of the first screw feeder 201 is in butt joint with a drying bin 202 for storing dry carbide slag. The first screw feeder 201 has the advantage that the screw conveying does not cause kiln gas leakage of the rotary kiln 200, and simultaneously ensures the process requirement of continuous feeding.
In the embodiment of the disclosure, the dry carbide slag flowing out of the blanking port of the drying kiln 100 is conveyed to the first storage bin 500400 for storage by the first conveyor, the first storage bin 500400 is provided with the second conveyor extending to the drying bin 202, and the drying bin 202 is provided with a detection device for detecting the carbide slag allowance in the drying bin 202. If insufficient carbide slag level in the drying silo 202 is detected, the second conveyor may be alerted or controlled to convey a replenishment. Put the bin together to the middle buffer action.
In the embodiment of the disclosure, in order to ensure the drying efficiency of the drying kiln 100 on carbide slag raw materials, the drying kiln 100 comprises a kiln body 101, wherein a feed inlet 102 is arranged at the top of the kiln body 101, a discharge outlet 103 is arranged at the bottom, an air outlet channel 104 extending from the bottom to the top is arranged in the kiln body, a space is reserved between the bottom end of the air outlet channel 104 and the discharge outlet 103, and the top end of the air outlet channel 104 extends to the outside of the kiln body 101; a plurality of first bulk material plates 105 and a plurality of second bulk material plates 106 are arranged in the kiln body 101 in a staggered manner in the vertical direction, wherein the first bulk material plates 105 are arranged in the top end direction of the interior of the kiln body 101, the first bulk material plates 105 are annular, the upper parts of the first bulk material plates 105 are connected with the outer side wall of the air outlet channel 104 in a sealing manner, the lower parts of the first bulk material plates 105 are dispersed towards the direction far away from the outer side wall of the air outlet channel 104 and are in a horn shape with the large ends facing downwards, and gaps are reserved between the lower parts of the first bulk material plates 105 and the inner wall of the kiln body 101; a second bulk cargo plate 106 is arranged below the first bulk cargo plate 105, the second bulk cargo plate 106 is annular, the upper part of the second bulk cargo plate is in sealing connection with the inner wall of the kiln body 101, the lower part of the second bulk cargo plate is folded towards the outer wall of the air outlet channel 104 to be in a horn shape with the large end upwards, and a gap is reserved between the lower part of the second bulk cargo plate 106 and the outer wall of the air outlet channel 104; an air inlet channel 107 is arranged outside the kiln body 101 and communicated between the inner wall of the kiln body 101 and the outer wall of the air outlet channel 104 from the upper part of the kiln body 101, and the air inlet channel 107 is used for connecting kiln tail air flow of the rotary kiln 200 through a pipeline; the principle of drying is that carbide slag to be dried is put into the kiln body 101 from the feed inlet 102, the carbide slag entering the kiln body 101 is dispersed by the first bulk material plate 105 and then naturally falls downwards, the carbide slag falls into the second bulk material plate 106 after passing through the first bulk material plate 105 in the natural falling process, and then falls into the next first bulk material plate 105, and the carbide slag reciprocates until reaching the discharge hole 103; the kiln tail gas flow of the rotary kiln 200 flows from the upper part to the lower part of the kiln body 101 after entering the interior of the kiln body 101 from the gas inlet channel 107, dries carbide slag, and the gas flow at the lower part of the kiln body 101 enters the air outlet channel 104 from the bottom end of the air outlet channel 104 and flows upwards.
The advantage is that the air current of stoving carbide slag can be at first with the carbide slag blow and disperse the back realization evenly scatter the whereabouts in dry kiln 100, and carbide slag can pass through the first bulk cargo board 105 and the second bulk cargo that have the slope and slowly descend in turn in the whereabouts in-process, has increased carbide slag's stoving dwell time in dry kiln 100. Meanwhile, the drying air flow enters from the upper part of the drying kiln 100, the high-temperature drying kiln preferentially dries the high-humidity carbide slag to take away most of water, and secondly, along with the downward movement of the drying air flow, the drying temperature is lower and lower, so that the kiln outlet temperature of the dried carbide slag is just reduced.
In the embodiment of the disclosure, a screw discharging machine 108 is arranged at the discharging hole 103 of the kiln body 101, and kiln gas is placed to leak.
In this disclosed embodiment, the air-out passageway 104 bottom is provided with first baffle 109 and second baffle 110 of staggered arrangement in the vertical direction, and first baffle 109 sets up in the opposite side of second baffle 110, and inside air-out passageway 104 was all connected on upper portion, and the lower part is inclined towards keeping away from air-out passageway 104 inner wall direction, and first baffle 109 is staggered in the vertical direction with the lower part of second baffle 110, avoids the stoving air current to carry carbide slag dust and rises perpendicularly and produce big dust content tail gas.
In the embodiment of the disclosure, a dust removing filter screen structure 111 is further disposed at the upper portion of the air outlet channel 104 to reduce the dust content of the tail gas, so as to reduce the treatment pressure of the subsequent tail gas.
In the embodiment of the disclosure, the air flow discharged from the air outlet channel 104 is purified by the bag-type dust collector 800.
In some embodiments, the blendor 600 is used to mix coke with quicklime and a second storage bin is provided for storing coke.
In some embodiments, the air stream entering the kiln for drying needs to be filtered.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The method for preparing the calcium carbide by using the carbide slag is characterized by comprising the following steps of:
Removing impurities, namely removing internal impurities from carbide slag;
drying, namely drying the carbide slag subjected to impurity removal by using a drying kiln;
calcining, namely calcining the dried carbide slag by using a rotary kiln to obtain quicklime;
proportioning, namely mixing calcined quicklime with coke according to a certain proportion to obtain a calcium carbide raw material;
smelting, namely conveying calcium carbide raw materials to a calcium carbide furnace, and smelting the calcium carbide raw materials in the calcium carbide furnace to obtain a calcium carbide finished product;
and the kiln tail air flow of the rotary kiln in the calcination process is connected into the air flow of the air inlet of the drying kiln in the drying process, so that the carbide slag is dried.
2. The method for preparing calcium carbide by using carbide slag as claimed in claim 1, wherein a temperature controller for adjusting the temperature of the air flow is arranged on a pipeline of the kiln tail gas of the rotary kiln connected to the air inlet of the drying kiln.
3. The method for preparing calcium carbide by using carbide slag as claimed in claim 2, wherein the temperature controller comprises a furnace body, the furnace body is provided with a hearth, an air inlet, an air supplementing opening, an air outlet and a temperature sensor, the air inlet enters the air flow and flows out of the air supplementing opening after passing through the hearth, a natural gas combustion furnace is arranged in the hearth, the temperature sensor is arranged at the air outlet and is used for detecting the air flow out temperature of the air outlet, a fan is arranged at the air outlet and rotates along with the air flow out of the air outlet, the air supplementing opening is communicated with the hearth, and a controller for controlling the air flow is arranged on the air supplementing opening.
4. The method for preparing calcium carbide by using carbide slag as claimed in claim 1, wherein a first screw feeder is arranged at a feed inlet of the rotary kiln, and the feed inlet of the first screw feeder is in butt joint with a drying bin for storing the dried carbide slag.
5. The method for preparing calcium carbide by using carbide slag as claimed in claim 4, wherein the dried carbide slag flowing out of the blanking port of the drying kiln is conveyed to a first storage bin for storage by a first conveyor, the first storage bin is provided with a second conveyor extending to the drying bin, and the drying bin is provided with a detection device for detecting carbide slag allowance in the drying bin.
6. The method for preparing calcium carbide by using carbide slag according to claim 1, wherein the drying kiln comprises a kiln body, a feed inlet is arranged at the top of the kiln body, a discharge outlet is arranged at the bottom of the kiln body, an air outlet channel extending from the bottom to the top is arranged in the kiln body, a space is reserved between the bottom end of the air outlet channel and the discharge outlet, and the top end of the air outlet channel extends to the outside of the kiln body;
The kiln comprises a kiln body, and is characterized in that a plurality of first bulk material plates and a plurality of second bulk material plates are arranged in the kiln body in a staggered manner in the vertical direction, wherein the first bulk material plates are arranged in the top end direction of the interior of the kiln body, the first bulk material plates are annular, the upper parts of the first bulk material plates are connected with the outer side wall of an air outlet channel in a sealing manner, the lower parts of the first bulk material plates are dispersed towards the direction away from the outer side wall of the air outlet channel and are in a horn shape with the large ends facing downwards, and gaps are reserved between the lower parts of the first bulk material plates and the inner wall of the kiln body;
A second bulk cargo plate is arranged below the first bulk cargo plate, the second bulk cargo plate is annular, the upper part of the second bulk cargo plate is in sealing connection with the inner wall of the kiln body, the lower part of the second bulk cargo plate is folded towards the outer wall of the air outlet channel and is in a horn shape with the large end upwards, and a gap is reserved between the lower part of the second bulk cargo plate and the outer wall of the air outlet channel;
an air inlet channel communicated between the inner wall of the kiln body and the outer wall of the air outlet channel from the upper part of the kiln body is arranged outside the kiln body, and the air inlet channel is used for being connected with kiln tail air flow of the rotary kiln through a pipeline;
The carbide slag to be dried is thrown into the kiln body from the feed inlet, the carbide slag entering the kiln body is dispersed by the first bulk material plate and naturally falls downwards, the carbide slag falls into the second bulk material plate after passing through the first bulk material plate in the natural falling process, and then falls into the next first bulk material plate, and the carbide slag is reciprocated until reaching the discharge hole;
and kiln tail air flow of the rotary kiln flows from the upper part of the kiln body to the lower part after entering the kiln body from the air inlet channel, dries carbide slag, and air flow from the lower part of the kiln body enters the air outlet channel from the bottom end of the air outlet channel and flows upwards.
7. The method for preparing calcium carbide by using carbide slag as claimed in claim 6, wherein a screw discharger is arranged at the discharge port of the kiln body.
8. The method for preparing calcium carbide by using carbide slag according to claim 6, wherein a first baffle plate and a second baffle plate which are staggered in the vertical direction are arranged at the bottom end of the air outlet channel, the first baffle plate is arranged on the opposite side of the second baffle plate, the upper parts of the first baffle plate and the second baffle plate are connected with the inside of the air outlet channel, the lower parts of the first baffle plate and the second baffle plate are inclined in the direction away from the inner wall of the air outlet channel, and the first baffle plate and the lower part of the second baffle plate are staggered in the vertical direction.
9. The method for preparing calcium carbide by using carbide slag as claimed in claim 6, wherein a dust removing filter screen structure is arranged at the upper part of the air outlet channel.
10. The method for preparing calcium carbide by using carbide slag as claimed in claim 6, wherein the air flow discharged from the air outlet passage is purified by a bag-type dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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