CN117160872A - Continuous separation method of coal gasification coarse slag - Google Patents
Continuous separation method of coal gasification coarse slag Download PDFInfo
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- CN117160872A CN117160872A CN202311025616.XA CN202311025616A CN117160872A CN 117160872 A CN117160872 A CN 117160872A CN 202311025616 A CN202311025616 A CN 202311025616A CN 117160872 A CN117160872 A CN 117160872A
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- 239000002893 slag Substances 0.000 title claims abstract description 123
- 238000000926 separation method Methods 0.000 title claims abstract description 83
- 238000002309 gasification Methods 0.000 title claims abstract description 66
- 239000003245 coal Substances 0.000 title claims abstract description 59
- 239000002002 slurry Substances 0.000 claims abstract description 81
- 238000007885 magnetic separation Methods 0.000 claims abstract description 39
- 238000004537 pulping Methods 0.000 claims abstract description 17
- 238000007873 sieving Methods 0.000 claims abstract description 14
- 230000005291 magnetic effect Effects 0.000 claims description 44
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 8
- 239000002245 particle Substances 0.000 description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 20
- 239000000126 substance Substances 0.000 description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 description 10
- 239000011707 mineral Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000006249 magnetic particle Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
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Abstract
The invention discloses a continuous separation method of coal gasification coarse slag, and belongs to the field of gas slag separation. The continuous separation method of the coal gasification coarse slag comprises the following steps: pulping the coal gasification coarse slag to obtain slag slurry; sieving the slurry to obtain slurry after first-stage separation; carrying out flat magnetic separation on the slag slurry after the first-stage separation to obtain slag slurry after the second-stage separation; and carrying out high-magnetic separation on the slag slurry after the second-stage separation to obtain slag slurry after the third-stage separation. The coal gasification coarse slag treatment process is simple, and the continuous separation efficiency is high.
Description
Technical Field
The invention relates to the field of coal gasification slag separation, in particular to a continuous separation method of coal gasification coarse slag.
Background
Coal gasification technology is known as a tap in the modern coal chemical industry, and can provide synthesis gas for the whole back-end chemical production, but a large amount of coal gasification slag is inevitably generated in the coal gasification process. In the coal gasification process, raw coal is quickly decomposed at high temperature in a gasification furnace, and then reacts with a gasifying agent to be converted into synthesis gas. In this process, gas-gasified slag is generated, wherein the gasification slag discharged from the bottom of the gasification furnace is generally called coarse slag, and the ratio of the gasification slag to the coarse slag is about 60% -80%, and the ratio of the gasification slag discharged from the top of the gasification furnace carried along with the gas flow is called fine slag, and the ratio of the gasification slag to the fine slag is about 20% -40%. The coal gasification coarse slag contains residual carbon and residual ash, the residual carbon is a direct energy source, and the residual ash can meet the combustion requirement of a boiler after being separated from the carbon, and can be applied to cement and concrete by blending combustion.
However, the current separation process of the residual char and the remaining ash of the coal gasification coarse slag is relatively inefficient.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a continuous separation method of coal gasification coarse slag, which aims to solve the problem that the separation process efficiency of the residual carbon and the rest ash slag of the existing coal gasification coarse slag is lower.
In order to achieve the above purpose, the invention provides a continuous sorting method of coal gasification coarse slag, comprising the following steps: pulping the coal gasification coarse slag to obtain slag slurry; sieving the slurry to obtain slurry after first-stage separation; carrying out flat magnetic separation on the slag slurry after the first-stage separation to obtain slag slurry after the second-stage separation; and carrying out high-magnetic separation on the slag slurry after the second-stage separation to obtain slag slurry after the third-stage separation.
Optionally, the pulping comprises continuously adding coal gasification coarse slag and water into a pulping tank.
Optionally, before the step of sieving the slurry to obtain the slurry after the first stage separation, the method further comprises: the slurry is introduced into a scrubber.
Optionally, the sieving is a rolling sieve or a high-frequency vibrating sieve.
Optionally, the screen mesh adopted by the rolling screen or the high-frequency vibrating screen is not smaller than 60 meshes.
Optionally, the flat magnetic separation adopts a permanent magnet flat machine.
Optionally, the high-magnetic separation adopts an electromagnetic vertical ring high-gradient magnetic separator.
Optionally, the magnetic field strength of the flat magnetic separation is 8000-15000 gauss.
Optionally, the magnetic field strength of the high magnetic separation is 15000 gauss to 20000 gauss.
Optionally, after the step of performing high magnetic separation on the second-stage separated slurry to obtain third-stage separated slurry, concentrating and vacuum dehydrating the third-stage separated slurry.
The invention has the beneficial effects that: according to the continuous separation method of the coal gasification coarse slag, disclosed by the invention, the coal gasification coarse slag is pulped by conveying a coal gasification coarse slag raw material to a pulping container by a loader, water is added to prepare pulp, and then the pulp is conveyed to subsequent equipment for separation by a belt conveyor. The magnetic material is arranged on the magnetic plate after the second-stage separation, and the ratio of carbon residue in the slag slurry after the second-stage separation is greatly increased. And (3) completely separating residual small-particle magnetic substances in the slag slurry after the second-stage separation through high-magnetic separation, wherein the slag slurry after the high-magnetic separation only contains carbon residues, so that the carbon residues and ash residues are completely separated. Through the design of the sorting method, the invention enables the whole production line to efficiently realize the separation of the carbon residue and the ash residue under the condition of lower energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other related drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a continuous separation method of coal gasification coarse slag according to an embodiment of the invention;
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it should be understood that the following embodiments are only for explaining the present invention and are not limited thereto.
Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning in the art to which the claimed subject matter belongs.
Coal gasification technology is known as a tap in the modern coal chemical industry, and can provide synthesis gas for the whole back-end chemical production, but a large amount of coal gasification slag is inevitably generated in the coal gasification process. In the coal gasification process, raw coal is quickly decomposed at high temperature in a gasification furnace, and then reacts with a gasifying agent to be converted into synthesis gas. In this process, gas-gasified slag is generated, wherein the gasification slag discharged from the bottom of the gasification furnace is generally called coarse slag, and the ratio of the gasification slag to the coarse slag is about 60% -80%, and the ratio of the gasification slag discharged from the top of the gasification furnace carried along with the gas flow is called fine slag, and the ratio of the gasification slag to the fine slag is about 20% -40%. The coal gasification coarse slag contains residual carbon and residual ash, the residual carbon is a direct energy source, and the residual ash can meet the combustion requirement of a boiler after being separated from the carbon, and can be applied to cement and concrete by blending combustion.
However, the current separation process of the residual char and the remaining ash of the coal gasification coarse slag is relatively inefficient.
In order to solve the problems, the invention provides a continuous sorting method of coal gasification coarse slag, which comprises the following steps:
s1, pulping coal gasification coarse slag to obtain slag slurry;
in the scheme, coal gasification coarse slag pulping is to convey coal gasification coarse slag raw materials to a pulping container by a loader, water is added for pulping, and slag pulp is conveyed to subsequent equipment for sorting by a belt conveyor.
S2, sieving the slurry to obtain slurry after first-stage separation;
because the main component of the carbon residue in the coal gasification coarse slag is coal with small particles, and the particle size distribution range of the rest ash residue is large, part of ash residue with large particle size can be firstly screened out in a screening mode, the processing capacity of the coal gasification coarse slag of the subsequent multistage magnetic separation can be reduced, and the subsequent separation efficiency can be improved.
S3, carrying out flat magnetic separation on the slag slurry after the first-stage separation to obtain slag slurry after the second-stage separation;
the slag selecting part in the gas slag has iron content over 50% and high magnetic field strength, so that the falling slag slurry is distributed homogeneously on the magnetic separator with planar magnetic plate rolling belt, and the magnetic plate has large area and high sieving precision and can select magnetic grains with relatively large size. The magnetic material is arranged on the magnetic plate after the second-stage separation, and the ratio of carbon residue in the slag slurry after the second-stage separation is greatly increased.
S4, carrying out high-magnetic separation on the slag slurry after the second-stage separation to obtain slag slurry after the third-stage separation.
The high magnetic separation field intensity is high, at least more than 10000 gauss can be achieved, the residual small-particle magnetic substances in the slag slurry after the second-stage separation can be completely selected, and the slag slurry after the third-stage separation only contains carbon residues, so that the carbon residues and ash residues are completely separated.
Further, the pulping comprises continuously adding coal gasification coarse slag and water into a pulping tank. Continuous pulping can provide raw material for continuous sorting, and in one embodiment, slurry in a pulping tank can be transported to a dosing machine for dosing.
Further, before the step of sieving the slurry to obtain the slurry after the first-stage separation, the method further comprises: the slurry is introduced into a scrubber. Slag slurry enters the cavity of the scrubbing machine through the feeding pipeline, and the slurry generates intense turbulence under the strong stirring action of the impeller. The ore particles have a large momentum therein and generate severe friction and collision with each other. The impurity film coated on the surface of the ore particles is easy to be stripped off the surface of the ore by friction and impact due to low strength. The cementing agent on the surface of the mineral is soaked in water and then is subjected to strong friction and collision among the mineral grains, so that the mineral grains are loosened and broken, and the separation of clay and the mineral grains is achieved. The thin film impurities and clay are crushed and peeled into slag slurry, and the slag slurry can be separated through subsequent desliming.
Further, a rolling screen or a high-frequency vibrating screen is adopted for sieving. In one embodiment, a rolling screen is used to screen the slurry, and as the slurry continuously passes through the rotating cylindrical screen, the fine particles fall through the screen openings into a fine particle hopper, and the coarse particles fall from the end of the cylindrical screen into a coarse particle hopper, thereby screening the slurry. In one embodiment, a high-frequency vibrating screen is used for screening the slurry, and the high-frequency vibrating screen can break the tension of the surface of the slurry and the high-speed vibration of the fine material on the screen surface, so that the useful minerals with relatively high density are accelerated, the separation effect is improved, the probability of the material with smaller separation granularity being contacted with the screen holes is improved, and better separation conditions are formed. Preferably, the sieving is a high frequency vibrating sieve.
Further, the screen mesh adopted by the rolling screen or the high-frequency vibrating screen is not smaller than 60 meshes. The main component of the carbon residue in the coal gasification coarse slag is coal with small particles, the size is relatively concentrated below 0.2mm in diameter, and the particle size distribution range of the rest ash is large, wherein about 50% of the particles are above 0.2mm, so that a screen with the particle size not less than 60 meshes is used for carrying out first-step particle size separation, 50% of slag separation is realized, and the production line efficiency is improved.
Further, the flat magnetic separation adopts a permanent magnet flat machine. The slag slurry after the first-stage separation enters a magnetic separator distributing device through a feeding pipeline, and is scattered on a discharge belt at the upper part of a magnetic plate after being uniformly dispersed. The slag slurry flows downwards along the inclined direction of the magnetic plate under the action of gravity, ferromagnetic substances in the slag slurry after the first-stage separation are firmly adsorbed on the iron unloading belt under the action of strong magnetic field force of the magnetic plate, and the iron unloading belt rotates along the inclined upper side of the magnetic plate under the drive of the motor, and meanwhile the adsorbed ferromagnetic substances are brought into the iron unloading area. Ferromagnetic substances enter the tailing bucket to be collected under the flushing of flushing water, and nonmagnetic slag slurry flows downwards along the magnetic plate and flows into the concentrate bucket. And the second-stage separation is carried out on the slag by using a permanent magnet flat machine, so that the treatment capacity of high-magnetic separation is reduced, and the energy consumption of the whole production line is further reduced.
Further, the high-magnetic separation adopts an electromagnetic vertical ring high-gradient magnetic separator. The electromagnetic vertical ring high gradient magnetic separator is characterized in that a part of the electromagnetic vertical ring high gradient magnetic separator is a magnetic field system consisting of a group of annular magnets, when mineral particles pass through the magnetic field system, magnetism of the mineral particles is captured under the action of a magnetic field, after the magnetic particles are subjected to the action of the magnetic force, the magnetic particles are gathered to form a magnetic filter layer in the magnetic field system, non-magnetic particles are repelled, and the mineral particles are separated and concentrated under the action of the magnetic filter layer, so that the purification and separation of the mineral particles are realized. The electromagnetic vertical ring high gradient magnetic separator can process particles with the particle diameter smaller than 10 mu m, the collecting efficiency of a filter layer is high, the high-purity mineral separation can be realized, the flux is large, and the efficiency of processing slag slurry after the second-stage separation is high.
Further, the magnetic field intensity of the flat magnetic separation is 8000-15000 gauss. The greater the magnetic field strength, the greater the attraction to the magnetic substance. However, too large a strong magnetic field has a side effect on the magnetic substance, resulting in unstable magnetization of the magnetic substance, and when the magnetic susceptibility decreases with increasing magnetic field strength, the separation effect decreases. In the stage of flat magnetic separation, the magnetic field strength of 8000-15000 gauss can avoid the magnetic flocculation of a high magnetic field to form magnetic particle clusters, and the recovery rate of magnetic substances is reduced. In some embodiments, the magnetic field strength of the flat magnetic separation is 9000 gauss, 10000 gauss, 11000 gauss, 12000 gauss, 13000 gauss, or 14000 gauss.
Further, the magnetic field intensity of the high-magnetic separation is 15000 gauss to 20000 gauss. The particle size of the slurry particles after the second-stage separation in the high-magnetic separation stage is small and uniform, the influence of factors such as static magnetic pole interaction, hydrodynamic shearing force, surface force and the like among the slurry particles after the second-stage separation is stable, and the influence of the magnetic field strength is increased, so that the larger magnetic attraction and better selectivity can be obtained by removing the influence. In some embodiments, the magnetic field strength of the high magnetic separation is 16000 gauss, 17000 gauss, 18000 gauss, or 19000 gauss.
Further, after the step of carrying out high-magnetic separation on the second-stage separated slurry to obtain third-stage separated slurry, the method further comprises the steps of concentrating and vacuum dehydrating the third-stage separated slurry. In one embodiment, the concentration is performed using a thickener. In one embodiment, the vacuum dewatering is achieved by vacuum filtration through a vacuum cloth.
Example 1:
pulping the coal gasification coarse slag to obtain slag slurry; sieving the slurry to obtain slurry after first-stage separation; the slag slurry after the first-stage separation is subjected to a flat magnetic separator to obtain slag slurry after the second-stage separation; and adding the slag slurry after the second-stage separation into a vertical ring high-gradient magnetic separator for high-magnetic separation to obtain slag slurry after the third-stage separation, and concentrating and vacuum dehydrating the slag slurry after the third-stage separation.
Comparative example 1:
the same sorting as in example 1 was carried out, except that: vertical ring high gradient magnetic separation is not adopted.
Comparative example 2:
the same sorting as in example 1 was carried out, except that: no plate magnetic separation was used.
Comparative example 3:
the same sorting as in example 1 was carried out, except that: no sizing was used for sieving.
Further, the separation steps of example 1 and comparative examples 1 to 3 were continuously performed due to the continuous supply of the slurry, and the treatment efficiency of the gas slag was recorded to obtain table 1:
TABLE 1 gasifiable slag classification data for example 1 and comparative examples 1-3
As can be seen from the table above, when 70 tons of the gas slag are treated at a fixed speed per hour, the improvement of the purity of valuable substances by about 10-20% can be realized by only increasing the line power of 7-8 kW in the embodiment 1 compared with the comparison examples 2 and 3, and the gas slag sorting efficiency is greatly improved. The continuous separation method of the coal gasification coarse slag is characterized in that part of main components of carbon residues in the coal gasification coarse slag are coal with small particles, meanwhile, the particle size distribution range of the rest ash residues is large, a part of ash residues with large particle sizes are screened out firstly through screening, the magnetic particles with large particle sizes are selected through flat magnetic separation, the residual small particle magnetic substances in the slag slurry after the flat magnetic separation are completely selected through high-magnetic separation, only the carbon residues are contained in the slag slurry after the high-magnetic separation, the complete separation of the carbon residues and the ash residues is realized, and the separation of the carbon residues and the ash residues is realized efficiently under the condition of low energy consumption by the design of the separation method.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A continuous separation method of coal gasification coarse slag, which is characterized by comprising the following steps:
pulping the coal gasification coarse slag to obtain slag slurry;
sieving the slurry to obtain slurry after first-stage separation;
carrying out flat magnetic separation on the slag slurry after the first-stage separation to obtain slag slurry after the second-stage separation;
and carrying out high-magnetic separation on the slag slurry after the second-stage separation to obtain slag slurry after the third-stage separation.
2. The continuous separation method of coal gasification coarse slag according to claim 1, wherein the pulping comprises continuously adding coal gasification coarse slag and water into a pulping tank.
3. The continuous separation method of coal gasification coarse slag according to claim 1, further comprising, before the step of sieving the slag slurry to obtain a slag slurry after the first stage separation: the slurry is introduced into a scrubber.
4. The continuous separation method of coal gasification coarse slag according to claim 1, wherein the sieving adopts a rolling sieve or a high-frequency vibrating sieve.
5. The continuous separation method of coal gasification coarse slag according to claim 4, wherein the screen mesh adopted by the rolling screen or the dither screen is not smaller than 60 mesh.
6. The continuous separation method of coal gasification coarse slag according to any one of claims 1 to 5, wherein the flat magnetic separation adopts a permanent magnet flat bed machine.
7. The continuous separation method of coal gasification coarse slag according to any one of claims 1 to 5, wherein the high magnetic separation adopts an electromagnetic vertical ring high gradient magnetic separator.
8. The continuous separation method of coal gasification coarse slag according to any one of claims 1 to 5, wherein the magnetic field strength of the flat magnetic separation is 8000 gauss to 15000 gauss.
9. The continuous separation method of coal gasification coarse slag according to any one of claims 1 to 5, wherein the magnetic field strength of the high magnetic separation is 15000 gauss to 20000 gauss.
10. The continuous separation method of coal gasification coarse slag according to any one of claims 1 to 5, further comprising concentrating and vacuum dewatering the third stage separated slag slurry after the step of subjecting the second stage separated slag slurry to high magnetic separation to obtain a third stage separated slag slurry.
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