CN109734095A - A method of with coal dust and calcium lime powder preparation production calcium carbide pelletizing - Google Patents
A method of with coal dust and calcium lime powder preparation production calcium carbide pelletizing Download PDFInfo
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- CN109734095A CN109734095A CN201910188222.3A CN201910188222A CN109734095A CN 109734095 A CN109734095 A CN 109734095A CN 201910188222 A CN201910188222 A CN 201910188222A CN 109734095 A CN109734095 A CN 109734095A
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- pelletizing
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- coal dust
- calcium
- binder
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- 238000005453 pelletization Methods 0.000 title claims abstract description 82
- 239000000843 powder Substances 0.000 title claims abstract description 78
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 71
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 71
- 239000004571 lime Substances 0.000 title claims abstract description 71
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000011575 calcium Substances 0.000 title claims abstract description 70
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 70
- 239000002817 coal dust Substances 0.000 title claims abstract description 67
- 239000005997 Calcium carbide Substances 0.000 title claims abstract description 48
- 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 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000011230 binding agent Substances 0.000 claims abstract description 63
- 238000002156 mixing Methods 0.000 claims abstract description 37
- 239000000203 mixture Substances 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000000197 pyrolysis Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 11
- 238000000748 compression moulding Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 239000011280 coal tar Substances 0.000 claims description 20
- 239000003245 coal Substances 0.000 claims description 19
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 239000004021 humic acid Substances 0.000 claims description 7
- 241000772415 Neovison vison Species 0.000 claims description 4
- 238000010348 incorporation Methods 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 37
- 239000000292 calcium oxide Substances 0.000 abstract description 17
- 235000012255 calcium oxide Nutrition 0.000 abstract description 17
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 230000029087 digestion Effects 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000002161 passivation Methods 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 8
- 239000011295 pitch Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 3
- 238000005267 amalgamation Methods 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 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
- 239000006028 limestone Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- -1 hydrogen compound Chemical class 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 101100037309 Enterobacteria phage T4 Y10A gene Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 102220481255 Thymocyte selection-associated high mobility group box protein TOX_Y10A_mutation Human genes 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 239000003574 free electron Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003318 humic coal Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 125000000468 ketone group Chemical group 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
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- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of methods with coal dust and calcium lime powder preparation production calcium carbide pelletizing, and for preparation method the following steps are included: calcium lime powder and binder A are stirred, acquisition particle surface has the mixture A of hydrophobic passivating film；Coal dust and binder B are added in the mixture A, mixture B is obtained after stirring；By the mixture B compression moulding, mixing pelletizing is obtained；The mixing pelletizing is subjected to pyrolysis processing, obtains production calcium carbide pelletizing.Method provided by the invention with coal dust and calcium lime powder preparation production calcium carbide pelletizing, by the way that first calcium lime powder and binder A are mixed, hydrophobic passivation film is formed on quicklime particles surface, digestion reaction can occur to avoid the water contained in calcium lime powder and coal dust, to improve the strength and stability of prepared pelletizing.
Description
Technical field
It is the present invention relates to carbide raw material production field, in particular to a kind of to be used with coal dust and calcium lime powder preparation production calcium carbide
The method of pelletizing.
Background technique
Coal resources in China is very rich, and the energy resource structure based on coal is the characteristic of China's economic development.By east
Area's resourse-depleting, middle part energy industry volume increase difficulty is big, southwest geological conditions specific safety risk is big etc. because
The influence of element, China's energy industry center of gravity gradually move westwards in recent years, and the energy strategy in the whole nation is " in optimizing east, stablizing at present
Portion, exploitation are western ".As the energy conversion industry of coal resource processing, calcium carbide industry must make every effort to develop, from conventional industries to now
It makes the transition for Chemical Industry, optimizes the structure of production and energy-saving and emission-reduction, clean manufacturing, hair of increasing economic efficiency for China's calcium carbide industry
Wave important function.
China's calcium carbide production capacity accounts for about the 95% of world's total output energy, with calcium carbide production capacity, sustained production rapid growth, calcium carbide work
Technology, complete set of equipments, energy-saving and emission-reduction and the comprehensive utilization of resources of industry all achieve achievement outstanding, but these technologies
Without fundamentally solving the problems, such as calcium carbide industry high pollution, high energy consumption.
Calcium carbide enterprise is usually by coal dust and calcium lime powder by being added binder mixed-forming at present, after pyrolysis as electricity
The novel material of stone furnace produces calcium carbide, but due to containing moisture, after coal dust is directly mixed with calcium lime powder, calcium lime powder in coal dust
Be easy absorb coal dust in moisture, the digestion reaction of lime occurs, makes pelletizing volume expansion, reduce pelletizing cold strength and
Stability, and a large amount of heat can be generated during the reaction, cause the vapor for being mixed with coal dust and calcium lime powder to generate, no
Only pollute environment, and waste of resource.
In view of the above drawbacks, creator of the present invention obtains the present invention by prolonged research and practice finally.
Summary of the invention
In view of this, the present invention is directed to propose it is a kind of with coal dust and calcium lime powder preparation production calcium carbide pelletizing method,
To solve that digestion reaction easily occurs due to directly mixing coal dust and calcium lime powder in the prior art, and cause molding pelletizing strong
Spend it is low, the problem of waste of resource.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A method of with coal dust and calcium lime powder preparation production calcium carbide pelletizing, comprising the following steps:
S1, calcium lime powder and binder A are stirred, obtain the mixture A that particle surface has hydrophobic passivating film；
S2, coal dust and binder B are added in the mixture A, mixture B is obtained after stirring；
S3, by the mixture B compression moulding, obtain mixing pelletizing；
S4, the mixing pelletizing is subjected to pyrolysis processing, obtains production calcium carbide pelletizing.
Further, the mass ratio of the calcium lime powder and the binder A are 10 ﹕ (0.1~1).
Further, the binder B is the 1%~20% of the coal dust and the mixture A gross mass.
Further, the binder A includes one of coal tar, carbolineum or mink cell focus.
Further, the binder B includes pitch, binding coal and humic acid blend.
Further, the partial size of the calcium lime powder is not higher than 5mm, its partial size of the coal dust is not higher than 3mm.
Further, the partial size that pelletizing is mixed obtained in the step 3 is 40~50mm, and the cold of mixing pelletizing resists
Compressive Strength is not less than 400N.
Further, the particle size range of the binder B particle is not higher than 1mm.
Further, the incorporation time being stirred in the step S1 is 5~10min；It is stirred in the step S2
Mixing time is 5~10min.
Compared with the existing technology, the method for the present invention with coal dust and calcium lime powder preparation production calcium carbide pelletizing has
There is following advantage:
(1) present invention can form hydrophobicity on quicklime particles surface by first mixing calcium lime powder and binder A
Passivation film, avoid the water contained in calcium lime powder and coal dust that digestion reaction occurs, to improve the strong of prepared pelletizing
Degree and stability.
(2) calcium lime powder used in the present invention can be the screenings of caustic lime block, calcium lime powder and coal dust both raw materials
It is simple and easy to get, do not need to carry out broken milling processing, the powdery resource of quick lime and coal can be made full use of, reduction is produced into
This, increases economic efficiency.
The binder A that the present invention uses can be coal tar, and the amalgamation of coal tar and coal dust is good, can make the combination of pelletizing
Power is stronger；The addition of coal tar will not reduce quality of the pelletizing as carbide raw material；And coal tar can be in the pyrolysis work of pelletizing
It is obtained in sequence, belongs to byproduct, it is at low cost.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the method flow schematic diagram of the present invention with coal dust and calcium lime powder preparation production calcium carbide pelletizing.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of method with coal dust and calcium lime powder preparation production calcium carbide pelletizing is present embodiments provided, in conjunction with Fig. 1 institute
Show, the preparation method specifically includes the following steps:
S1, calcium lime powder and binder A are stirred, obtain the mixture A that particle surface has hydrophobic passivating film；
S2, coal dust and binder B are added in mixture A, obtain mixture B after mixing evenly；
S3, mixture B is put into compression moulding in molding equipment, obtains mixing pelletizing；
S4, mixing pelletizing is subjected to pyrolysis processing, obtains production calcium carbide pelletizing.
Wherein, binder A includes one of coal tar, carbolineum or mink cell focus, and binder B includes pitch, binding coal
With humic acid blend.
In the prior art, the binder for preparing the coal dust of calcium carbide and using usually requires to be dried, this is because if coal
Water content is excessive in powder and binder, and digestion reaction occurs for the calcium oxide molecule of hydrone and quick lime, generates calcium hydroxide, no
More heat transfer can be only released, the vapor for being mixed with coal dust and calcium lime powder is generated, it could even be possible to making coal powder ignition；Disappear simultaneously
Change calcium hydroxide or calcium carbonate that reaction generates, in subsequent mixing pelletizing high temperature pyrolysis, calcium hydroxide and calcium carbonate therein
It decomposes, releases carbon dioxide and water, reduce the hole increase, volume expansion, density of resulting production calcium carbide pelletizing, thus
Its strength and stability is caused to decline.
The present embodiment forms one layer by the way that quick lime and binder A are first carried out mixed processing, on the surface of calcium lime powder
Hydrophobic passivation film can prevent the water contained in calcium lime powder and subsequent coal dust from carrying out digestion reaction, be conducive to next
The mixing compression moulding of step.
Wherein, in step sl, mixing plant is biaxial rneader, is stirred by the way that binder A to be sprayed onto calcium lime powder
Mixing is mixed, by the way of sprinkling binder A can mix with calcium lime powder and more divide equally, to guarantee that calcium lime powder surface can
Form hydrophobic passivating film.It is stirred specifically, the calcium lime powder in quick lime powder cabin can be transported to twin shaft by oscillating feeder
It mixes in machine, while the binder A in binder A storage tank is sent by pumping to biaxial rneader and is mixed.Calcium lime powder and viscous
The incorporation time for tying agent A is 5~10min, and calcium lime powder and binder A in mixture A can be thus achieved as a result, and be uniformly mixed again
It can energy saving.
The additive amount of binder A can be adjusted according to calcium lime powder amount, it is only necessary to guarantee binder A and calcium lime powder
Mass ratio range be 1~10% namely the mass ratio of calcium lime powder and the binder A are 10 ﹕ (0.1~1).
Binder A includes one of coal tar, carbolineum or mink cell focus, or other oils, as long as and quick lime
After powder mixing, hydrophobic passivating film can be formed on calcium lime powder surface.In the present embodiment, binder A is preferably coal tar
Oil hinders the digestion reaction of calcium lime powder and water because coal tar can form hydrophobic passivation film on quick lime surface；
Meanwhile coal tar has a certain degree of cohesiveness energy, can preferably mix with coal dust, will not reduce pelletizing as carbide raw material
Quality improves the compression strength of the mixing pelletizing of preparation to a certain extent；In addition, the coal tar that uses of the present embodiment can be
It mixes and is obtained in the pyrolysis processing process of pelletizing, belong to the byproduct prepared during calcium carbide pelletizing, it is at low cost.
Calcium lime powder can be the quicklime particles that will be obtained after quick lime break process, or the sieve of caustic lime block
Lower object.The present embodiment is preferably the screenings for using caustic lime block, not only makes raw material simple and easy to get in this way, does not need to carry out brokenly
Comminution powder processing, to simplify production technology, save the cost；And script can cannot be directly added into discarded in furnace of calcium carbide
Calcium lime powder is made full use of, and avoids wasting.Wherein, calcium lime powder partial size is not higher than 5mm, and partial size is higher than the quick lime of 5mm
It can be added directly into furnace of calcium carbide.
In step s 2, the mixing of coal dust, binder B, mixture A is carried out in intensive mixer, to guarantee coal
Powder, mixture A (calcium lime powder that area load has binder A) and binder B are sufficiently mixed uniformly.Specifically, will be with bonding
The mixed calcium lime powder of agent A, the coal dust in pulverized coal bin and the binder B in binder B warehouse, while being added to strength and mixing
It is mixed in machine, obtains the mixture B that main component is coal dust and calcium lime powder.Wherein, incorporation time is 5~10min, by
This, it can realize that calcium lime powder, binder A, coal dust and binder B are uniformly mixed in mixture B and can energy saving.
It is understood that since the load of calcium lime powder particle surface has binder A, binder A to have certain bonding
Performance and good with the amalgamation of coal dust, can make the binding force of pelletizing stronger, therefore in the mixed process with coal dust and binder B
In, at binder A and binder B collective effect, calcium lime powder can be made to connect with coal dust more preferable, so that resulting
Produce calcium carbide pelletizing intensity with higher.
The additional amount of binder B is the 1%~20% of coal dust and mixture A gross mass.The mass ratio of coal dust and mixture A
It is not limited, complex working condition adjustment when can be according to calcium carbide actual production.During subsequent pyrolysis processing, mainly
Pyrogenetic reaction occurs for the coal dust in pelletizing, and caustic lime block can also be added again during pyrolysis processing, therefore, in this reality
It applies in example preferably, the mass ratio of coal dust and mixture A are 10 ﹕ (1~9).
Wherein, binder B is with the binder compared with strong cohesive property, may include pitch, binding coal and humic acid etc.
Mixture.Before mixing, binder B can be subjected to break process, to be not higher than the particle size range of binder B particle
1mm, the binder B of the particle size range can be significantly better than other partial sizes to improve the balling ratio of mixture B.
Pitch and binding coal are the macromolecular containing aromatic ring and hydroxyl, and humic acid has carboxyl, phenolic group, ketone group isoreactivity base
Group；And it is a kind of carbon of high aromaticity that coal molecule, which is containing heteroatomic macromolecular, coal tar (binder A) such as thick aromatic ring and O, N,
The complex mixture of hydrogen compound, the overwhelming majority is with side chain or without the polycyclic of side chain, fused ring compound and oxygen-containing, sulphur, nitrogen
Heterocyclic compound, have polar group.Pitch, binding coal, humic acid and coal molecule are with pi-pi accumulation and hydrogen bond phase interaction
With, and can crosslink and react with coal tar.It can make the interconnection of coal dust and calcium lime powder by the way that binder B is added, make
The pellet strength of formation increases, and binder A and binder B can form plane mesh structure or 3 D stereo knot in pelletizing
Structure, to increase the calorific intensity of pelletizing.
Coal dust used in the present embodiment can be the low orders coal dust such as jet coal, and guarantee makes full use of existing powdery former
Material.Wherein, coal particle size is not higher than 3mm, in subsequent forming step, if the partial size of the particle of coal dust is excessive, and quick lime
Powder, binder B cannot reach closs packing, so that molding pellet density reduces, lead to the intensity of gained production calcium carbide pelletizing
It reduces.
In step s3, mixture B is put into compression moulding in molding equipment, available molding mixing pelletizing, by
There is stronger caking property in binder B, the present embodiment can be such that coal dust and calcium lime powder forms through high pressure mixing at normal temperature.
Specifically, molding equipment is high-pressure ball press, molding pressure can be adjusted according to the proportion of calcium lime powder and coal dust,
In this implementation, it is preferred that high-pressure ball press specification is selected as, and pressure roller diameter is 800mm, and the maximum pressure between pressure roller is
380t, line pressure 11t/cm, the balling ratio of ball press is greater than 90%, and high-pressure ball press has the function of pre-pressing, molding pressure
Power is 11~20MPa.
The particle size range for the mixing pelletizing that compression moulding obtains in the present embodiment is 40~50mm, and the quality for mixing pelletizing can
To be evaluated by its drop resistant intensity, cold compression strength.Drop resistant intensity be pelletizing fall under prescribed conditions and be hit power when
Crush resistance energy；Cold compression strength refers to the ability that pelletizing is anti-extrusion in room temperature and impacts.Wherein, the drop resistant of pelletizing is mixed
The test method of intensity are as follows: take 10 samples weighings, in the openable chest of bottom, open case in liftoff 2.0m eminence
Bottom allows on sample free-electron model to the steel plate of 12mm thickness, after falling three times repeatedly, is sieved with sieve, takes > the weight percent of 5mm
Index of the number as the drop resistant intensity of mixing pelletizing.Mix the measuring method of the cold compression strength of pelletizing are as follows: set mixing pelletizing
In on model LDS-Y10A pellet pressure test machine, applies to carry under conditions of speed is 10mm/min in pressure testing machine and be surveyed
Examination.
After measured, the 2m steel plate fall strength of briquette (> 5mm) for pelletizing being mixed prepared by the present embodiment is no less than 95%, cold anti-
Compressive Strength is not less than 400N.As can be seen that prepared mixing pelletizing cold strength with higher, it is not easy to broken.
In S4 step, mixing pelletizing is subjected to pyrolysis processing, obtains production calcium carbide pelletizing.Specifically, mixing pelletizing
In coal dust, coal tar, binding coal, pitch and humic acid are decomposed when being pyrolyzed and polycondensation reaction, releasing low boiling point has
Machine object CO, H2And low-carbon alkanes, alkene, aromatic ring polycondensation, further annelation form CaC2- CaO eutectic, the fixation generated
Carbon is as production calcium carbide carbon raw material.Wherein, the temperature range of pyrolysis processing be 700~800 DEG C, pyrolysis time be 0.5~
1h can significantly improve the intensity of gained pelletizing under this pyrolytical condition.
Quality after mixing pelletizing pyrolysis can be evaluated by hot compressive strength, method particularly includes: by molding mixing
Pelletizing is supplied into the pyrolysis oven of logical nitrogen, and 1h is pyrolyzed at 750 DEG C, and pelletizing is placed in model LDS- after being then pyrolyzed gained
It is measured on Y10A pellet pressure test machine, it is 10mm/min that pressure testing machine, which is applied and carries speed,.Into measurement as can be seen that through excessively high
The hot compressive strength for mixing pelletizing after solution is warmed not less than 400N, still has higher intensity after pyrolysis, hot compressive strength is good, breaks
It is broken few, meet the production requirement of furnace of calcium carbide.
The method for present embodiments providing a kind of coal dust and pulverized limestone preparation production calcium carbide pelletizing, by first by quick lime
Powder is mixed with binder A, forms hydrophobic passivation film in calcium lime powder particle surface, and calcium lime powder and water can be prevented to send out
Raw digestion reaction；Then it adds coal dust and binder B is mixed, will be finally made after mixed material pressure ball molding, pyrolysis
Produce the pelletizing of calcium carbide, pelletizing obtained after tested, cold compression strength with higher, it is not easy to broken, the heat after pyrolysis
Compression strength is also higher, meets the production requirement of furnace of calcium carbide, therefore can be used as the raw material of furnace of calcium carbide.
The method of coal dust and pulverized limestone preparation production calcium carbide pelletizing provided in this embodiment, utilizes calcium lime powder and coal dust
As primary raw material, wherein calcium lime powder can use the screenings of caustic lime block, calcium lime powder and coal dust both raw materials letter
Singly it is easy to get, it is at low cost, it does not need to carry out broken milling processing, reduces energy consumption, reduce pollution section.Through this embodiment
Preparation method can make full use of the powdery resource of quick lime and coal, reduce production cost, increase economic efficiency.
In the method for coal dust and pulverized limestone preparation production calcium carbide pelletizing provided in this embodiment, it can be made using coal tar
For binder A, hydrophobic passivation film is formed in calcium lime powder particle surface using the hydrophobicity of coal tar, prevents quick lime
Digestion reaction occurs for powder and water, can reduce the limitation to the moisture condition of coal dust in this way, reduces dry step in production process
Suddenly, save the cost.Meanwhile the amalgamation of coal tar and coal dust is good, the binding force of pelletizing can be kept stronger；The addition of coal tar will not
Quality of the pelletizing as carbide raw material is reduced, and since coal tar is available in the pyrogenic processes of mixing pelletizing, belongs to life
The byproduct of stone is produced electricity, therefore can be further reduced the cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which comprises the following steps:
S1, calcium lime powder and binder A are stirred, obtain the mixture A that particle surface has hydrophobic passivating film；
S2, coal dust and binder B are added in the mixture A, mixture B is obtained after stirring；
S3, by the mixture B compression moulding, obtain mixing pelletizing；
S4, the mixing pelletizing is subjected to pyrolysis processing, obtains production calcium carbide pelletizing.
2. the method according to claim 1 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The mass ratio of the calcium lime powder and the binder A are 10 ﹕ (0.1~1).
3. the method according to claim 2 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The binder B is the 1%~20% of the coal dust and the mixture A gross mass.
4. the method according to claim 1 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The binder A includes one of coal tar, carbolineum or mink cell focus.
5. the method according to claim 1 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The binder B includes pitch, binding coal and humic acid blend.
6. the method according to claim 1 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The partial size of the calcium lime powder is not higher than 5mm, its partial size of the coal dust is not higher than 3mm.
7. the method according to claim 1 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The partial size that pelletizing is mixed obtained in the step 3 is 40~50mm, and the cold compression strength of the mixing pelletizing is not less than 400N.
8. the method according to claim 4 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The particle size range of the binder B particle is not higher than 1mm.
9. the method according to claim 7 with coal dust and calcium lime powder preparation production calcium carbide pelletizing, which is characterized in that
The incorporation time being stirred in the step S1 is 5~10min；The mixing time stirred in the step S2 be 5~
10min。
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