CN115959684A - Production process and device of lime nitrogen - Google Patents
Production process and device of lime nitrogen Download PDFInfo
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- CN115959684A CN115959684A CN202211701812.XA CN202211701812A CN115959684A CN 115959684 A CN115959684 A CN 115959684A CN 202211701812 A CN202211701812 A CN 202211701812A CN 115959684 A CN115959684 A CN 115959684A
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- MYFXBBAEXORJNB-UHFFFAOYSA-N calcium cyanamide Chemical compound [Ca+2].[N-]=C=[N-] MYFXBBAEXORJNB-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 54
- 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 claims abstract description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000005121 nitriding Methods 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 31
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 25
- 239000010436 fluorite Substances 0.000 claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000000047 product Substances 0.000 claims description 36
- 239000002994 raw material Substances 0.000 claims description 36
- 238000003860 storage Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 24
- 239000011265 semifinished product Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 9
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000000227 grinding Methods 0.000 abstract description 9
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 abstract description 7
- 238000005469 granulation Methods 0.000 abstract description 4
- 230000003179 granulation Effects 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 8
- 239000003337 fertilizer Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 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
- 239000004202 carbamide Substances 0.000 description 2
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000242678 Schistosoma Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229940069978 calcium supplement Drugs 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000002837 defoliant Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 230000006806 disease prevention Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a process for producing lime nitrogen, which comprises the steps of crushing calcium carbide, removing iron, uniformly mixing 1-3% fluorite and foundry returns with lime nitrogen, grinding the calcium carbide powder into calcium carbide powder with the fineness not less than 200 meshes by a ball mill, feeding the calcium carbide powder into a nitriding furnace, reacting with nitrogen at the high temperature of 1100-1200 ℃, roasting to generate lime nitrogen, taking out frits, crushing, grinding the frits into powder by a ball mill, and refining to obtain a finished product of lime nitrogen (calcium cyanamide). The invention selects the composite rotary nitriding furnace and the cooling rotary drum as main production equipment, thereby improving the level of devices of the project, reducing the production cost and improving the production environment. By controlling the production operation, the granulation of the sintering melt in the furnace is increased, and the product granulation rate is improved. The lime nitrogen produced by the lime nitrogen production process and the device has high purity and high yield, the total nitrogen content in the obtained lime nitrogen is more than or equal to 23.5 percent, the effective nitrogen content is more than or equal to 21.5 percent, the free calcium carbide is less than or equal to 0.2 percent, the screen residue (850 mu m) is less than or equal to 3 percent, and the yield is 10 ten thousand tons per year of refined lime nitrogen.
Description
Technical Field
The invention relates to the technical field of lime nitrogen production, in particular to a production process and a device of lime nitrogen.
Background
Lime nitrogen (calcium cyanamide) (CaCN 2), commonly known as lime nitrogen, can be used as fertilizer, plant defoliant, pesticide (for killing schistosome), cyanide, etc., and is applied to various aspects of industrial and agricultural production. The fertilizer is widely used in agriculture in the sixth and seventies of the 20 th century, such as base fertilizer for rice, soil acidity regulation, plant calcium supplement and the like. The lime nitrogen (calcium cyanamide) has the characteristics of natural fertilizer, and is a pesticide fertilizer without public nuisance, safety, sanitation, residue and environmental pollution. Lime nitrogen (calcium cyanamide) reacts with water in soil to generate calcium hydroxide and cyanamide firstly, the cyanamide is hydrolyzed continuously to generate urea, and finally, the urea is converted into nitrate nitrogen in a plant available state for crops to absorb and utilize. In alkaline soil, the formed cyanamide can be further polymerized into dicyandiamide, and both the cyanamide and the dicyandiamide have the effects of disinfection, deinsectization and disease prevention. At the same time, they are nitrification inhibitors, which can inhibit the activity of soil nitrifying bacteria and prevent the conversion of ammonia nitrogen into nitrate nitrogen, so that the contents of nitrate and nitrite in soil and vegetables can be reduced. In addition, the calcium cyanamide preparation contains calcium oxide, generates a large amount of heat in the process of generating calcium hydroxide when meeting water, and also plays a role in disinfection. Owing to the toxicity and high heat releasing bactericidal effect of lime nitrogen in the conversion process, it may be used in preventing and controlling various soil-borne diseases and soil pests. Because calcium cyanamide is an alkaline fertilizer, the acidity of the soil can be improved by using the calcium cyanamide, and the pH value of the soil can be increased.
Patent CN 108557842B discloses a dustless production process of high-grade lime nitrogen, raw materials are crushed and mixed; adding lime nitrogen into the returned materials; feeding the mixture into a raw material bin; rotating to scatter the material and introducing N 2 -CO 2 Mixing gas to make C simple substance generate CO, discharging CO-containing furnace gas, filtering and reusing N 2 (ii) a Crushing the discharged furnace material through a disc crushing and discharging system, and starting a negative pressure fan and an electrostatic dust collector to remove dust; and conveying the furnace burden crushed by the disc crushing and discharging system to crushing and ball milling through a belt conveyor. The equipment involved in the process comprises a raw material bin, a spiral feeder, a material spreader, a settling furnace, a disc crushing and discharging system, a temperature instrument, an automatic control system, a main gas pipe, a coil pipe heat exchanger, an adsorption tower and an electrostatic dust collector. At present, the lime nitrogen production process mainly adopts two production methods of a settling furnace and a rotary kiln rotary furnace to produce lime nitrogen, and a settling furnace device and a production process are production processes and devices which are eliminated by the state in the clear. Patent CN 208087502U discloses a production device of lime nitrogen, which comprises a calcium carbide conveying device, a fluorite conveying device, a foundry returns conveying device, a first scraper conveyor, a ball mill, a second scraper conveyor, a burden storage bin, a burden metering device, a pneumatic conveying device, a 10-ten thousand-ton rotary nitriding furnace,the lime nitrogen rotary kiln comprises a lime nitrogen fine crusher, a third scraper conveyor, a plate chain hoist, a lime nitrogen storage bin, a constant feeder, an HRM type vertical mill, a lime nitrogen finished product storage bin, a particle lime nitrogen storage bin and nitrogen conveying equipment, and although a single lime nitrogen rotary kiln with the capacity of 10 ten thousand tons is built and put into production, the nitrogen content in the lime nitrogen is low.
Disclosure of Invention
In view of the prior art, the invention aims to provide a process and a device for producing lime nitrogen.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a production process of lime nitrogen, which comprises the following steps:
(1) The method comprises the following steps of (1) crushing calcium carbide by a first jaw crusher for the first time, conveying the calcium carbide to a calcium carbide bin, crushing the calcium carbide in the calcium carbide bin by a secondary crushing system, mixing the crushed calcium carbide with fluorite and a return charge, and feeding the mixture into a raw material ball mill to be ground into powder;
(2) Conveying the powder into a front raw material bin, conveying the powder into a composite rotary nitriding furnace by using nitrogen, and carrying out nitriding reaction on the powder and the nitrogen to generate lime nitrogen;
(3) The lime nitrogen with the diameter of more than or equal to 25mm is crushed by the second jaw crusher and directly enters the semi-finished product bin, the lime nitrogen with the diameter of less than 25mm enters the semi-finished product bin after being cooled by the cooling rotary drum, the lime nitrogen in the semi-finished product bin is sent to a finished product ball mill, and the lime nitrogen is sent to a finished product storage bin after being ground into powder lime nitrogen.
Preferably, in the step (1), the primary crushed particle size of the calcium carbide is 80-100mm, the secondary crushed particle size is less than or equal to 5mm, and the calcium carbide: fluorite: the mass ratio of the returned materials is (75-80): (1-1.5): (20-25), and the particle size of the powder is more than or equal to 200 meshes.
Preferably, in the step (2), the pressure of the nitrogen is 0.1-0.3MPa, the temperature of the nitridation reaction is 950-1050 ℃, and the time is 8-10h.
The invention provides a lime nitrogen production device, which comprises a raw material system, a nitriding system and a finished product system which are sequentially connected, wherein the raw material system comprises a first jaw crusher, a belt conveyor, a calcium carbide bin, a hammer crusher, a first embedded scraper chain conveyor, a first bucket elevator, a first vibrating screen and a calcium carbide batching bin which are sequentially connected, and further comprises a fluorite batching bin and a return charge batching bin, wherein the calcium carbide batching bin, the fluorite batching bin and the return charge batching bin are respectively connected with a second embedded scraper chain conveyor, and the second embedded scraper chain conveyor is sequentially connected with a second bucket elevator, a raw material ball mill, a third embedded scraper chain conveyor, a third bucket elevator and a raw material bin in front of the furnace; the nitriding system comprises a composite rotary nitriding furnace, a furnace tail sieve, a slab mill and a large block storage bin which are sequentially connected, wherein a second jaw crusher is arranged at the bottom of the large block storage bin, and the furnace tail sieve is also connected with a cooling rotary drum; the finished product system comprises a Z-shaped bucket elevator, a second vibrating screen, a semi-finished product bin, a finished product ball mill and a finished product storage bin which are sequentially connected.
Preferably, the stokehole raw material bin is connected with the compound rotary nitriding furnace.
Preferably, the second jaw crusher and the cooling drum are respectively connected with a Z-shaped bucket elevator.
Preferably, the second vibrating screen is further connected with a particle lime nitrogen bin.
Preferably, the compound rotary nitriding furnace is also connected with a nitrogen tank.
After the calcium carbide is crushed by a jaw crusher, conveying the crushed calcium carbide into a calcium carbide bin for storage through a belt conveyor with a large inclination angle; feeding calcium carbide in the calcium carbide bin into a hammer crusher for secondary crushing, conveying the calcium carbide subjected to secondary crushing to a vibrating screen by a buried scraper chain conveyor and a bucket elevator for screening, and feeding the calcium carbide with the thickness of 4-6mm screened out into a particle calcium carbide bin for storage, packaging and sale; and feeding the sieved powder calcium carbide into a calcium carbide batching bin for storage. Conveying fluorite to a fluorite proportioning bin for storage by a bucket elevator; conveying the finished lime nitrogen to a returned material proportioning bin for storage by a star-shaped feeder and a pneumatic conveying bin pump; carry the second to bury scraper chain conveyor through the weigher with carbide in the carbide proportioning bins, fluorite in the fluorite proportioning bins and returning charge in the returning charge proportioning bins, bury scraper chain conveyor and second bucket elevator by the second and carry the raw materials ball mill in and grind. And conveying the ground materials of the raw material ball mill to a front raw material bin for storage through a third embedded scraper chain conveyor and a third bucket elevator. And conveying the materials in the stokehole raw material bin to a composite rotary nitriding furnace for nitriding reaction by a rotor metering material spraying system. Screening materials after the nitridation reaction in the composite rotary nitriding furnace by a furnace tail screen, and conveying screened powder into a cooling rotary drum for cooling; and conveying the screened large blocks to a large block storage bin by an apron machine, and crushing by a second jaw crusher at the bottom of the large block storage bin. And the materials crushed by the second jaw crusher and the cooling materials of the cooling rotary drum are conveyed to a second vibrating screen together by the Z-shaped bucket elevator for screening. The screened particle lime nitrogen enters a particle lime nitrogen bin for storage, packaging and sale; and feeding the screened powder lime nitrogen into a semi-finished product bin for storage. And conveying the materials in the semi-finished product bin to a finished product ball mill for grinding. The materials ground by the finished product ball mill are conveyed to a finished product storage bin for storage, packaging and sale through a bucket elevator and a chain conveyor, or conveyed to a cyanamide workshop for use.
Grinding calcium carbide (CaC) 2 ) In fluorite (CaF) 2 ) Under the catalytic action of the catalyst, the reaction is carried out in a rotary nitriding reaction furnace at the temperature of 1000-1050 ℃ to generate lime nitrogen (CaCN) 2 ). The reaction formula is as follows:
when the temperature is more than 1200 ℃, the CaCN 2 The reverse reaction takes place.
The invention has the beneficial effects that:
the invention selects the composite rotary nitriding furnace and the cooling rotary drum as main production equipment, thereby improving the level of devices of the project, reducing the production cost and improving the production environment. By controlling the production operation, the granulation of the sintering melt in the furnace is increased, and the product granulation rate is improved. The lime nitrogen produced by the lime nitrogen production process and the device has high purity and high yield, the total nitrogen content in the obtained lime nitrogen is more than or equal to 23.5 percent, the effective nitrogen content is more than or equal to 21.5 percent, the free calcium carbide is less than or equal to 0.2 percent, the screen residue (850 mu m) is less than or equal to 3 percent, and the yield is 10 ten thousand tons per year of refined lime nitrogen.
Drawings
FIG. 1: the invention relates to a process flow chart of a raw material workshop section;
FIG. 2: the technological process of the nitriding workshop section of the invention is shown;
FIG. 3: the invention discloses a process flow chart of a finished product workshop section;
shown in the figure: 1. a first jaw crusher; 2. a belt conveyor; 3. a carbide bin; 4. a hammer crusher; 5. a first embedded scraper chain conveyor; 6. a first bucket elevator; 7. a first vibrating screen; 8. a calcium carbide batching bin; 9. a fluorite proportioning bin; 10. a return burden proportioning bin; 11. a second embedded scraper chain conveyor; 12. a second bucket elevator; 13. a raw material ball mill; 14. a third embedded scraper chain conveyer; 15. a third bucket elevator; 16. a stokehole raw material bin; 18. a composite rotary nitriding furnace; 19. a furnace tail sieve; 20. scale plate machines; 21. a bulk bin; 22. a second jaw crusher; 23. a nitrogen tank; 24. cooling the drum; 25. a Z-shaped bucket elevator; 26. a second vibrating screen; 27. a semi-finished product bin; 28. a finished product ball mill; 29. finished product storage; 30. and a granular lime nitrogen bin.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background art, the invention provides a production process of lime nitrogen, which comprises the following steps:
(1) Carrying out primary crushing with first jaw breaker 1 with the carbide, the particle size of primary crushing is 80-100mm, carries to carbide storehouse 3, and the carbide passes through the secondary crushing system breakage in carbide storehouse 3, and the particle size of secondary crushing is less than or equal to 5mm, mixes the carbide after will crushing with fluorite, back-up burden after, the carbide: fluorite: the mass ratio of the returned materials is (75-80): (1-1.5): (20-25), feeding the mixture into a raw material ball mill 13 for grinding into powder, wherein the particle size of the powder is more than or equal to 200 meshes.
(2) Conveying the powder into a front raw material bin 16, conveying the powder into a composite rotary nitriding furnace 18 by using 0.1-0.3MPa nitrogen, and carrying out nitriding reaction on the powder and the nitrogen to generate lime nitrogen, wherein the temperature of the nitriding reaction is 950-1050 ℃ and the time is 8-10h.
(3) Lime nitrogen with the diameter of more than or equal to 25mm is crushed by the second jaw crusher 22 and directly enters the semi-finished product bin 27, the lime nitrogen with the diameter of less than 25mm is cooled by the cooling rotary drum 24 and then enters the semi-finished product bin 27, the lime nitrogen in the semi-finished product bin 27 is sent to the finished product ball mill 28, ground into powder lime nitrogen and then sent to the finished product storage bin 29.
A lime nitrogen production device comprises a raw material system, a nitriding system and a finished product system which are sequentially connected, wherein the raw material system comprises a first jaw crusher 1, a belt conveyor 2, a calcium carbide bin 3, a hammer crusher 4, a first embedded scraper chain conveyor 5, a first bucket elevator 6, a first vibrating screen 7, a calcium carbide proportioning bin 8, a fluorite proportioning bin 9 and a scrap return proportioning bin 10 which are sequentially connected, the calcium carbide proportioning bin 8, the fluorite proportioning bin 9 and the scrap return proportioning bin 10 are respectively connected with a second embedded scraper chain conveyor 11, the second embedded scraper chain conveyor 11 is sequentially connected with a second bucket elevator 12, a raw material ball mill 13, a third embedded scraper chain conveyor 14, a third bucket elevator 15 and a raw material bin 16 in front of a furnace, the stokehole raw material bin 16 is connected with a composite rotary nitriding furnace 18, the nitriding system comprises the composite rotary nitriding furnace 18, a furnace tail screen 19, a apron machine 20 and a large material bin 21 which are sequentially connected, a second jaw crusher 22 is arranged at the bottom of the large material bin 21, the composite rotary nitriding furnace 18 is further connected with a nitrogen tank 23, the furnace tail screen 19 is further connected with a cooling rotary drum 24, the second jaw crusher 22 and the cooling rotary drum 24 are respectively connected with a Z-shaped bucket elevator 25, the finished product system comprises the Z-shaped bucket elevator 25, a second vibrating screen 26, a semi-finished product bin 27, a finished product ball mill 28 and a finished product storage bin 29 which are sequentially connected, and the second vibrating screen 26 is further connected with a granular lime nitrogen bin 30.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention were all conventional in the art and commercially available.
Examples
A production process of lime nitrogen comprises the following steps:
(1) The calcium carbide is crushed for the first time by a first jaw crusher 1, the particle size of the crushed for the first time is 80-100mm, the calcium carbide is conveyed to a calcium carbide bin 3, the calcium carbide in the calcium carbide bin 3 is crushed by a secondary crushing system, the particle size of the secondary crushing is less than or equal to 5mm, the crushed calcium carbide is mixed with fluorite and foundry returns, the mass fraction of the calcium carbide is 77%, the mass fraction of the fluorite is 1.5%, the mass fraction of the foundry returns is 21.5%, the calcium carbide is sent into a raw material ball mill 13 to be ground into powder, and the particle size of the powder is more than or equal to 200 meshes.
(2) Conveying the powder into a front raw material bin 16, conveying the powder into a composite rotary nitriding furnace 18 by using 0.1-0.3MPa nitrogen, and carrying out nitriding reaction on the powder and the nitrogen to generate lime nitrogen, wherein the temperature of the nitriding reaction is 950-1050 ℃ and the time is 8-10h.
(3) Lime nitrogen with the diameter of more than or equal to 25mm is crushed by the second jaw crusher 22 and directly enters the semi-finished product bin 27, the lime nitrogen with the diameter of less than 25mm is cooled by the cooling rotary drum 24 and then enters the semi-finished product bin 27, the lime nitrogen in the semi-finished product bin 27 is sent to the finished product ball mill 28, ground into powder lime nitrogen and then sent to the finished product storage bin 29.
The utility model provides a apparatus for producing lime nitrogen, is including the raw materials system, nitrogenize system and the finished product system that connect gradually, the raw materials system is including the first jaw breaker 1, band conveyer 2, carbide storehouse 3, hammer crusher 4, first buried scraper chain conveyer 5, first bucket elevator 6, first shale shaker 7, carbide proportioning bins 8 that connect gradually, still include fluorite proportioning bins 9 and scrap-back material proportioning bins 10, carbide proportioning bins 8, fluorite proportioning bins 9 and scrap-back material proportioning bins 10 are connected with second buried scraper chain conveyer 11 respectively, second buried scraper chain conveyer 11 in proper order with second bucket elevator 12, raw materials ball mill 13, third buried scraper chain conveyer 14, third bucket elevator 15, stokehold raw materials storehouse 16 is connected with compound rotary nitriding furnace 18, the nitrogenize system is including the compound rotary nitriding furnace 18 that connects gradually, stokehold sieve 19, scale board machine 20, slabstone 21, be equipped with second rotary furnace tail crusher 22 bottom rotary furnace crushing machine 22, compound jaw furnace 18 still is connected with compound rotary screen jar 23 and is connected gradually, second slabstone finished product jar 24 is connected with compound rotary drum semi-finished product grinding machine 24, rotary drum finished product jar 24, rotary drum finished product grinding machine 24, rotary drum semi-finished product jar 24 is connected gradually, rotary drum type grinding machine 24, rotary drum type finished product jar 24 is connected gradually, rotary drum type finished product jar 24, rotary drum type finished product grinding machine 24 is connected with compound.
The total nitrogen content of the obtained finished product lime nitrogen is 23.5 percent, the effective nitrogen content is more than or equal to 21.5 percent, the free calcium carbide is less than or equal to 0.2 percent, the screen residue (850 mu m) is less than or equal to 3 percent, and the yield is 10 ten thousand tons per year.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The production process of lime nitrogen is characterized by comprising the following steps:
(1) The method comprises the following steps of (1) crushing calcium carbide by a first jaw crusher for the first time, conveying the calcium carbide to a calcium carbide bin, crushing the calcium carbide in the calcium carbide bin by a secondary crushing system, mixing the crushed calcium carbide with fluorite and a return charge, and feeding the mixture into a raw material ball mill to be ground into powder;
(2) Conveying the powder into a front raw material bin, conveying the powder into a composite rotary nitriding furnace by using nitrogen, and carrying out nitriding reaction on the powder and the nitrogen to generate lime nitrogen;
(3) The lime nitrogen with the diameter of more than or equal to 25mm is crushed by the second jaw crusher and directly enters the semi-finished product bin, the lime nitrogen with the diameter of less than 25mm enters the semi-finished product bin after being cooled by the cooling rotary drum, the lime nitrogen in the semi-finished product bin is sent to a finished product ball mill, and the lime nitrogen is sent to a finished product storage bin after being ground into powder lime nitrogen.
2. The process for producing lime nitrogen as claimed in claim 1, wherein in step (1), the primary crushed particle size of the calcium carbide is 80-100mm, the secondary crushed particle size is not more than 5mm, and the calcium carbide: fluorite: the mass ratio of the returned materials is (75-80): (1-1.5): (20-25), and the particle size of the powder is more than or equal to 200 meshes.
3. The process for producing cyanamide as claimed in claim 1, wherein in the step (2), the pressure of the nitrogen gas is 0.1-0.3MPa, the temperature of the nitriding reaction is 950-1050 ℃ and the time is 8-10h.
4. The lime nitrogen production device is characterized by comprising a raw material system, a nitriding system and a finished product system which are sequentially connected, wherein the raw material system comprises a first jaw crusher, a belt conveyor, a calcium carbide bin, a hammer crusher, a first embedded scraper chain conveyor, a first bucket elevator, a first vibrating screen and a calcium carbide proportioning bin which are sequentially connected, and further comprises a fluorite proportioning bin and a scrap recycling material proportioning bin, wherein the calcium carbide proportioning bin, the fluorite proportioning bin and the scrap recycling material proportioning bin are respectively connected with a second embedded scraper chain conveyor, and the second embedded scraper chain conveyor is sequentially connected with a second bucket elevator, a raw material ball mill, a third embedded scraper chain conveyor, a third bucket elevator and a stokehole raw material bin; the nitriding system comprises a composite rotary nitriding furnace, a furnace tail sieve, a plate descaling machine and a large block storage bin which are sequentially connected, wherein a second jaw crusher is arranged at the bottom of the large block storage bin, and the furnace tail sieve is also connected with a cooling rotary drum; the finished product system comprises a Z-shaped bucket elevator, a second vibrating screen, a semi-finished product bin, a finished product ball mill and a finished product storage bin which are sequentially connected.
5. The apparatus for producing lime nitrogen according to claim 4, wherein the stokehole material bunker is connected to a compound rotary nitriding furnace.
6. The apparatus for producing lime nitrogen as claimed in claim 4, wherein the second jaw crusher and the cooling drum are connected to a Z-shaped bucket elevator.
7. The apparatus for producing lime nitrogen of claim 4, wherein the second vibrating screen is further connected to a granular lime nitrogen silo.
8. The apparatus for producing lime nitrogen as claimed in claim 4, wherein the rotary nitriding furnace is further connected to a nitrogen tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211701812.XA CN115959684A (en) | 2022-12-29 | 2022-12-29 | Production process and device of lime nitrogen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211701812.XA CN115959684A (en) | 2022-12-29 | 2022-12-29 | Production process and device of lime nitrogen |
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| CN115959684A true CN115959684A (en) | 2023-04-14 |
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| CN202211701812.XA Pending CN115959684A (en) | 2022-12-29 | 2022-12-29 | Production process and device of lime nitrogen |
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