CN110586622B - Method for comprehensively utilizing gasifier slag resources - Google Patents
Method for comprehensively utilizing gasifier slag resources Download PDFInfo
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- CN110586622B CN110586622B CN201910902980.7A CN201910902980A CN110586622B CN 110586622 B CN110586622 B CN 110586622B CN 201910902980 A CN201910902980 A CN 201910902980A CN 110586622 B CN110586622 B CN 110586622B
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- 239000002893 slag Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000002309 gasification Methods 0.000 claims abstract description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 239000004566 building material Substances 0.000 claims abstract description 7
- 239000004088 foaming agent Substances 0.000 claims abstract description 5
- 239000000446 fuel Substances 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 3
- 239000003814 drug Substances 0.000 claims abstract description 3
- 238000005188 flotation Methods 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 5
- 239000002283 diesel fuel Substances 0.000 claims description 4
- WVYWICLMDOOCFB-UHFFFAOYSA-N 4-methyl-2-pentanol Chemical compound CC(C)CC(C)O WVYWICLMDOOCFB-UHFFFAOYSA-N 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 3
- 239000010665 pine oil Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 37
- 239000007791 liquid phase Substances 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/48—Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for comprehensively utilizing gasification furnace slag resources, which is characterized by comprising the following steps: the method comprises the following steps: (1) Hydraulic classification, namely putting the gasification furnace slag into a liquid phase, and sorting out coarse slag and fine slag according to different particle sizes; (2) treating the coarse slag and using the coarse slag as a building material; grinding the fine slag; (3) size mixing: mixing the ground fine slag with a medicament comprising a size mixing agent, a catching agent and a foaming agent to prepare slag slurry with a certain concentration; (4) separation: separating the slag slurry into high carbon powder and primary tail ash; separating the primary tail ash into medium carbon powder and secondary tail ash again; (5) treating the high carbon powder for preparing the carbon-based material; the medium carbon powder is used for fuel after being processed; the secondary tail ash is used for building materials after being processed. The method effectively separates the carbon with high calorific value and the tail ash with low loss of ignition in the gasification furnace slag, can greatly improve the utilization way of the gasification furnace slag, saves raw coal resources, and effectively solves the problem of environmental pollution of the gasification furnace slag.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for comprehensively utilizing gasification furnace slag resources.
Background
The application of the coal gasification technology is an important part of the energy strategy in China, but a large amount of coal gasification furnace slag can be generated at the same time, a million-ton coal gasification and coal oil project which takes coal gasification as one of the core technologies can generate over 60 million tons of coal gasification furnace slag every year, and if the coal gasification furnace slag is buried, the environment-friendly benefit is poor, the cost is high, and the enterprise burden is heavy. The comprehensive utilization of the large amount of coal gasification furnace slag is the most important means, otherwise, the accumulation of the coal gasification furnace slag can bring a series of serious environmental problems, occupy a large amount of land resources, pollute the surrounding land and influence the land area; moreover, a large amount of accumulated coal gasification furnace slag can enter the atmosphere under the action of certain power conditions, so that air pollution is easily caused; in addition, the coal gasifier has no toxicity, but if the coal gasifier is accumulated for a long time, under the long-time action of natural environmental conditions such as rainwater, particularly acid rain, and the like, some metal ions and the like in the slag can be dissolved into soil or water bodies to pollute the soil and the water bodies. Meanwhile, the coal gasification furnace slag contains a part of carbon and other available substances, and idle accumulation is also a waste of resources.
The formation process of the gasification furnace slag is greatly different from that of the fly ash, most of the fly ash in the power plant is oxidized and combusted by the pulverized coal, and the formation of a liquid phase of ash in the coal at high temperature is completed under a strong oxidation condition. The gasification slag is mainly reduced due to partial oxidation of coal, so that residual carbon is easily caused, coke is porous along with the escape of volatile matters, and the porous carbon is mixed with high-temperature liquid phase and forms the gasification slag along with quenching. The generation process of the gasification furnace slag and the fly ash is greatly different, so that the composition and the structure of the gasification furnace slag are greatly different from those of the fly ash. The gasification furnace slag has a porous structure and high carbon content, and cannot be utilized like common coal ash. At present, the utilization of the gasification slag at home and abroad basically focuses on the composition and utilization of ash in the coal gasification slag, but the residual carbon in the coal gasification slag is ignored, and the gasification slag is mixed with raw coal and then sent to a circulating fluidized bed boiler for incineration in the prior art, but in the actual use process, the gas is usedDue to the physical and chemical properties of the chemical slag, the abrasion of the circulating fluidized bed boiler is aggravated, and the production stability is influenced. The main component of the coal gasification slag is SiO 2 、Al 2 O 3 CaO, feO and the like, and simultaneously contains a large amount of C elements (carbon powder) caused by incomplete combustion of coal powder; how to utilize the incompletely combusted C element (carbon powder) has been the subject of research in the industry.
CN201710897261.1 patent discloses a coal gasification slag purification process and a system for implementing the process, wherein a, ash removal is performed on coal gasification slag to obtain high ash coal gasification slag with an ad greater than 60% and low ash coal gasification slag with an ad less than 60%; b, separating the low-ash coal gasification furnace slag with Ad less than 60% to obtain clean coal, tail coal and an intermediate with AD less than 40%, returning the intermediate to the separation device again for secondary separation, and performing next treatment on the clean coal and the tail coal; c, dehydrating the clean coal; d, drying the dehydrated clean coal to obtain coal with the water content of below 20 percent; and e, concentrating the tail coal to realize solid-liquid separation. The technology only removes the ash layer on the gasification furnace slag particles with the particle size of less than 0.5mm to obtain high-ash ore pulp and low-ash ore pulp. Low efficiency and poor effect.
Disclosure of Invention
The invention solves the problems of how to effectively remove carbon components in the gasification furnace slag, and poor separation effect and low efficiency of the existing gasification furnace slag, and discloses a method for comprehensively utilizing gasification furnace slag resources, which can obtain unburned carbon with higher calorific value and tail ash with low loss of combustion, can greatly improve the utilization approach of the gasification furnace slag, saves raw coal resources, effectively solves a series of problems of utilization of the gasification furnace slag, and has good development prospect.
The method comprises the following steps:
(1) Hydraulic classification, namely putting the gasification furnace slag into a liquid phase, and sorting out coarse slag and fine slag according to different particle sizes;
(2) The coarse slag is used for building materials after being processed; grinding the fine slag;
(3) Size mixing: mixing the ground fine slag with a medicament comprising a size mixing agent, a catching agent and a foaming agent to prepare slag slurry with a certain concentration;
(4) Separation: separating the slag slurry into high carbon powder and primary tail ash; separating the primary tail ash into medium carbon powder and secondary tail ash again;
(5) The high carbon powder is used for preparing the carbon-based material after being processed; the medium carbon powder is used for fuel after being processed; the secondary tail ash is used for building materials after being processed. A
As mentioned above, the liquid phase in step (1) is coarse slag and fine slag with different particle sizes of 1mm or more and 1mm or less in water.
The particle size control range of the fine slag ground in the step (2) is 20-200 μm.
The sizing agent in the step (3) is HCl, naOH or H 2 SO 4 One or more of (a).
The trapping agent in the step (3) is one or more of kerosene and light diesel oil.
The foaming agent in the step (3) is one or more of pine oil, methyl isobutyl carbinol and sec-octanol.
The concentration control range of the slag slurry in the step (3) is as follows: 100g/L to 400g/L.
In the step (4), the carbon content of the high carbon powder is 65-75%, the carbon content of the medium carbon powder is 40-65%, and the carbon content of the secondary tail ash is less than or equal to 8%.
The separation mode of the step (4) is one of flotation, reverse flotation, magnetic separation and electric separation.
The invention has the beneficial effects that: the method can obtain unburned carbon with higher calorific value and tail ash with low loss of combustion, can greatly improve the utilization approach of the gasification furnace slag, saves raw coal resources, effectively solves a series of problems of utilization of the gasification furnace slag, expands the utilization approach of the gasification furnace slag, effectively reduces a series of problems of utilization generation of the gasification furnace slag and the like, and has good development prospect.
The scheme removes the carbon component in the gasification furnace slag, the removed carbon component can be used as fuel for recycling, the utilization efficiency of raw coal is improved, the decarbonized gasification furnace slag can replace fly ash to produce building materials or be utilized in other ways, the utilization way of the gasification furnace slag is expanded, the problem that the gasification furnace slag occupies land due to stockpiling is solved, and the high-quality grinding is used for breaking the silicate coating in fine slag, so that particles can be separated in a liquid phase. The implementation of the method has good environmental protection, economic and social benefits.
Detailed Description
The following specific embodiments are given to further illustrate the present invention in detail, but are not to be construed as limiting the invention in any way.
Example 1
(1) Sieving the gasification furnace slag to remove particles with the particle size larger than 3mm, and feeding the undersize into hydraulic classification to separate coarse slag and fine slag with the particle size larger than or equal to 1mm and smaller than 1 mm.
(2) The separated fine slag and water are sent to a baseball mill to be ground to 20-100 μm.
(3) The concentration of the gasification slag ore pulp is adjusted to 100g/L.
(4) Adding NaOH, pine oil and light diesel oil into the gasification furnace slag slurry, and then sending the mixture into a primary flotation column to obtain high-carbon mortar with high carbon content and primary tail mortar with low carbon content.
And (3) feeding the separated primary tail ash ore pulp into a secondary flotation column for secondary flotation to obtain medium carbon ash and secondary tail ash with carbon content of 40%.
The loss on ignition of the secondary tail ash obtained in the embodiment is less than or equal to 5 percent, the calorific value of the high carbon ash is 5100kcal, the ash content of the high carbon ash is 9 percent, the calorific value of the medium carbon ash is 4200kcal, and the ash content is 42 percent.
Example 2
(1) Sieving the gasification furnace slag to remove particles with the particle size larger than 3mm, and feeding the undersize into hydraulic classification to separate coarse slag and fine slag with the particle size larger than or equal to 1mm and smaller than 1 mm.
(2) The difference from the embodiment 1 is that the separated fine slag and water are sent to a baseball mill to be ground to 40-85 μm.
(3) The difference from example 1 is that the gasification slag pulp concentration was adjusted to 270g/L.
(4) The difference from example 1 is that the gasification slag slurry is fed into a primary flotation column by adding HCl, kerosene and methyl isobutyl carbinol to obtain high carbon mortar with high carbon content and primary tail mortar with low carbon content.
And (3) feeding the separated primary tail ash ore pulp into a secondary flotation column for secondary flotation to obtain medium carbon ash with the carbon content of 40% and secondary tail ash.
The loss on ignition of the secondary tail ash obtained in the embodiment is less than or equal to 3 percent, the calorific value of the high carbon ash is 5900kcal, the ash content of the high carbon ash is 6 percent, the calorific value of the medium carbon ash is 4000kcal, and the ash content is 45 percent.
Example 3
The difference between the present embodiment and the above embodiments is that the fine slag and water are sent to the baseball mill to be ground to 100 μm to 200 μm, and the concentration of the gasified slag ore pulp is adjusted to 400g/L. The separation mode is reverse flotation.
The difference from examples 1-2 is that a predetermined amount of H is added to the gasification slag slurry 2 SO 4 And feeding HCl, light diesel oil and octanol into a primary flotation column to obtain high-carbon mortar with high carbon content and primary tail mortar with low carbon content.
The separation mode in the step (4) is magnetic separation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (3)
1. A method for comprehensively utilizing gasification furnace slag resources is characterized by comprising the following steps: the method comprises the following steps:
(1) Hydraulic classification, namely sieving the gasification furnace slag to remove particles with the particle size of more than 3mm, and sending the undersize into hydraulic classification to separate coarse slag with the particle size of more than or equal to 1mm and fine slag with the particle size of less than 1 mm;
(2) The coarse slag is used for building materials after being processed; grinding the fine slag to the particle size of 20-200 μm, and damaging the silicate coating in the fine slag;
(3) Size mixing: mixing the ground fine slag with a medicament comprising a size mixing agent, a catching agent and a foaming agent to prepare a slag slurry with a certain concentration, wherein the size mixing agent is HCl, naOH or H 2 SO 4 One or more of the solutions, slag slurriesThe concentration is 100g/L to 400g/L;
(4) Separation: separating the slag slurry into high carbon powder and primary tail ash; separating the primary tail ash into medium carbon powder and secondary tail ash again, wherein the separation mode is any one of flotation, reverse flotation, magnetic separation and electric separation;
(5) The high carbon powder is used for preparing the carbon-based material after being processed; the medium carbon powder is used for fuel after being processed; the secondary tail ash is used for building materials after being processed, wherein the carbon content of the high carbon powder is 65-75%, the carbon content of the medium carbon powder is 40-65%, and the carbon content of the secondary tail ash is less than or equal to 8%.
2. The method for comprehensively utilizing the gasification slag resource according to claim 1, wherein: the catching agent in the step (3) is one or more of kerosene and light diesel oil.
3. The method for comprehensively utilizing the gasification slag resource according to claim 1, wherein: the foaming agent in the step (3) is one or more of pine oil, methyl isobutyl carbinol and sec-octanol.
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| CN201910902980.7A CN110586622B (en) | 2019-09-24 | 2019-09-24 | Method for comprehensively utilizing gasifier slag resources |
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| CN111644263B (en) * | 2020-06-16 | 2022-04-12 | 太原理工大学 | Combined separation process and device for realizing carbon-ash separation of gasified slag |
| CN111644264B (en) * | 2020-06-16 | 2022-04-08 | 太原理工大学 | Gasification slag gravity-magnetic combined separation process |
| CN111892969A (en) * | 2020-08-18 | 2020-11-06 | 李立峰 | Process for extracting refined carbon powder from slag |
| CN112893391A (en) * | 2020-12-30 | 2021-06-04 | 中国矿业大学 | Dry separation process and system for gasification furnace slag |
| CN113351363B (en) * | 2021-05-28 | 2022-12-09 | 中国矿业大学 | Difficult-to-separate gasified slag flotation separation method based on residual carbon particle pore filling |
| CN113684065A (en) * | 2021-08-16 | 2021-11-23 | 北京旭胜兄弟科技发展有限公司 | Raw material gasification apparatus and raw material gasification method |
| CN116078348A (en) * | 2021-11-08 | 2023-05-09 | 中国科学院过程工程研究所 | Comprehensive utilization method of gas slag |
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| CN101456689A (en) * | 2009-01-08 | 2009-06-17 | 长安大学 | Comprehensive utilization method of coal water slurry gasified waste residue on Texaco gasifier |
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| CN101480659B (en) * | 2009-01-23 | 2011-06-22 | 智胜化工股份有限公司 | Method for automatically recycling and treating carbon residue from boiler slag of coal gasification |
| CN101638591A (en) * | 2009-08-11 | 2010-02-03 | 章新喜 | Recovery method of carbon in slag from gasifying furnace |
| CN103934098A (en) * | 2014-05-15 | 2014-07-23 | 华东理工大学 | High-carbon pulverized coal ash/coal slag decarbonization and classification method and device |
| CN105236454A (en) * | 2015-09-14 | 2016-01-13 | 中国矿业大学 | Method and apparatus for synthesizing hydrotalcite-like material by using coal gasification furnace residue as aluminum source |
| CN107321765A (en) * | 2017-08-09 | 2017-11-07 | 开阳浩洋环保科技开发有限公司 | A kind of coal chemical industry gasifier slag decarbonization device |
| CN108906339A (en) * | 2018-09-10 | 2018-11-30 | 贵州大学 | A kind of Floatation of Removal Carbon method of flyash |
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Effective date of registration: 20230410 Address after: 832099 No. 36 Beisan East Road, Development Zone, Shihezi City, Xinjiang Uygur Autonomous Region Patentee after: XINJIANG TIANYE (Group) Co.,Ltd. Patentee after: Xinjiang Tianye Ecological Technology Co.,Ltd. Address before: No. 36 Beisan East Road, Economic and Technological Development Zone, Shihezi City, Xinjiang Uygur Autonomous Region, 832000 Patentee before: XINJIANG TIANYE (Group) Co.,Ltd. |