CN102553882B - Energy-saving calcining method for increasing activity of coal gangue - Google Patents
Energy-saving calcining method for increasing activity of coal gangue Download PDFInfo
- Publication number
- CN102553882B CN102553882B CN201010593991.0A CN201010593991A CN102553882B CN 102553882 B CN102553882 B CN 102553882B CN 201010593991 A CN201010593991 A CN 201010593991A CN 102553882 B CN102553882 B CN 102553882B
- Authority
- CN
- China
- Prior art keywords
- gangue
- temperature
- coal
- pyrolysis
- burning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention relates to an energy-saving calcining method for increasing activity of coal gangue, comprising the following steps of: (1) crushing, grinding and pyrolyzing the coal gangue; (2) performing useful constituent extracting and solid-liquid separation on material to be activated, putting the solid in a primary burning furnace to burn, obtaining gangue coke and generating high-temperature gas mainly comprising nitrogen and carbon monoxide; and (3) putting the gangue coke in a secondary burning furnace to continue to burn, obtaining solid product gangue ash and generating high-temperature gas mainly comprising the nitrogen and the carbon dioxide, wherein the heat generated in the steps can be fully and flexibly utilized. The method provided by the invention has the positive effects that: the activation of the coal gangue is not influenced by coal burning, the temperature in the furnaces is uniform and controllable, the calcining product is stable in quality and the activity of calcined coal gangue is increased; the coal burning is not restrained by the activation temperature, the burning temperature is adjustable and the heat is fully utilized; and the method has high desulfurization efficiency, no influence on the activation of the coal gangue, no pollution to environment and prospect of industrial popularization.
Description
Technical field
The present invention relates to reclamation of solid wastes technical field, relate to the high added value comprehensive utilization of gangue, specifically, is a kind of energy-conservation method for calcinating that improves gangue active.
Background technology
Gangue is the solid waste of rejecting in coal mining and washing process.China is big coal country, and the gangue discharge amount of abandoning is huge, piles reserves over 3,000,000,000 tons to China's gangue accumulative total in 2005.Gangue is dissolved on a large scale and high-valued comprehensive utilization is the severe challenge that China faces.In more than 2/3rds gangue of China, be mainly that kaolinite is main clay mineral, Al in its calcining lime-ash
2o
3content can reach more than 40%, is one of most valuable bauxite resource.
The current technology of recycling bauxite resource from gangue is for improving reactivity and increasing recovery rate, need to be by gangue through high-temperature calcination to excite the reactivity of clay mineral: as, Chinese patent ZL00112070.0 " utilizes gangue to produce aluminium salt and silicate technology method ", and it takes the method for calcining with the temperature of 600～750 ℃ in fluidized bed furnace or transmitting stove.Chinese patent ZL94113062.2 " prepares aluminium hydroxide technique with gangue ", and it is taked at 650～750 ℃ of roasting temperatures.Chinese patent ZL200610017165.5 " by the method for gangue extracting sulfuric acid aluminium, sodium metasilicate and derived product thereof " takes at 500～600 ℃ of roasting temperatures.The optimum activation temperature of coal series clay minerals is 550～700 ℃, thereby excess Temperature can generate the reactivity that inert substance significantly reduces product.The problem running in engineering application is, adopts existing calcine technology, utilizes the carbon in gangue directly to burn, and controls temperature in the time of 500～750 ℃, and combustion process is unstable, easily flame-out, and the ignition point of part gangue is up to more than 800 ℃.Therefore, the temperature in gangue high-temperature calcination process is controlled and is just become very difficult, and therefore the quality of calcined product is also difficult to control, and the carbonaceous in gangue can not get sufficient utilization.
Another problem is that the coal that China produces generally contains certain sulfur, must use sulfur removal technology, and current comparatively advanced sulfur removal technology is to mix calcium calcining sulfur removal technology for meeting when emission request is calcined.But existing calcined coal gangue activating process is subject to desulfurization temperature (the calcium desulfurizing temperature of mixing of coal will be more than 850 ℃) and Control of Impurities restriction; Cannot adopt and mix calcium calcining sulfur removal technology.
In order to solve above-mentioned two problems, some techniques have been taked the means of admixture auxiliary agent calcining, make gangue still can obtain high activity product under higher calcining heat condition, as Chinese patent ZL200510048215.1 " a kind of method of coal gangue for producing alumina " adds the sodium carbonate of 0.5～1 times at 700～900 ℃ of roasting temperatures by alumina content in gangue.But the calcine technology of this admixture auxiliary agent has not only increased energy consumption, also increased production cost simultaneously.In addition,, because carbonaceous content in gangue is often widely different, existing calcine technology generally can not adapt to this, therefore in practical operation in order to maintain the stable of calcining heat, when carbonaceous content is few, need to mixes coal calcination, thereby reduce the treating capacity of calcining furnace to gangue in the unit interval; And when carbonaceous content is many, need in calcining furnace, increase cooling device to move heat, the means that the heat of generation can not get utilizing fully or utilizing are subject to very large constraint.
Summary of the invention
The object of the invention is, for the deficiencies in the prior art, a kind of energy-conservation method for calcinating that improves gangue active is provided, two processes of the thermal activation of the burning of ature of coal in gangue and clay mineral can be separated, become that a kind of productive rate is stable, the method for calcinating of environmental friendliness, low energy consumption.
For achieving the above object, the technical scheme that the present invention takes is:
An energy-conservation method for calcinating that improves gangue active, is characterized in that, comprises the following steps:
(1) crushing and grinding gangue is broken, grinding, in fluidized bed pyrolysis calcining furnace, pyrolysis 10～30 minutes at 550～650 ℃, obtains active coal gangue;
(2) active coal gangue step (1) being obtained in leacher with acid or alkali reaction, extract useful constituent, reactant is separated through solid-liquid separator; After separating obtained solid drying, send in one-level combustion furnace and burn, pass into appropriate air and make coal dust generation imperfect combustion, reaction temperature is 800～900 ℃, and the reaction time is 30～60 minutes, obtain solid product spoil burnt, reaction generates that to take nitrogen and carbon monoxide be main high-temperature gas;
(3) spoil Jiao who step (2) is obtained sends into the burning of secondary firing stove, the pyrolysis gas that step (1) pyrolysis calcining furnace is produced is sent into the burning of secondary firing stove, pass into excess air, reaction temperature is 900～1300 ℃, and obtaining solid product spoil ash and take nitrogen and carbon dioxide is main high-temperature gas.
Pyrolysis in described step (1) is to take the high-temperature gas of one-level combustion furnace as fluidized gas, and the high-temperature gas of secondary firing stove of take is thermal source gas.
The ignition temperature of step (2) is 800～900 ℃, and the high-temperature gas of generation can be sent into the pyrolysis oven of step (1) as fluidized gas.
The ignition temperature of step (3) is 900～1300 ℃, the secondary firing stove that the pyrolysis gas that step (1) generates and fluidized gas can be sent into step (3) simultaneously, and the pyrolysis oven that the high-temperature gas that step (3) generates can be sent into step (1) is as thermal source gas.
The present invention's good effect is compared with prior art:
(1) activating coal gangue is not subject to the impact of ature of coal burning, and in calcining furnace, temperature is evenly controlled, and calcined product steady quality has improved the activity of calcining coal gangue;
(2) ature of coal burning is not subject to the constraint of activation temperature, and ignition temperature is adjustable, and completely, Btu utilization is fully flexible, meets low-carbon (LC) requirement in carbonaceous burning;
(3) combustion furnace desulfurization is not subject to temperature limiting, desulfuration efficiency high and on the activation of gangue without impact, there is the feasibility of industrialization promotion.
Accompanying drawing explanation
Accompanying drawing is the equipment flowsheet schematic diagram of the present invention's energy-conservation method for calcinating of improving gangue active;
Label in figure is respectively:
1, crushing and grinding; 2, pyrolysis calcining furnace; 3, leacher;
4, solid-liquid separator; 5, one-level combustion furnace; 6, secondary firing stove.
The specific embodiment
Below in conjunction with accompanying drawing, provide the specific embodiment that the present invention improves the energy-conservation method for calcinating of gangue active, 5 embodiment are provided, but it should be pointed out that enforcement of the present invention is not limited to following embodiment.
Referring to Fig. 1.Improve an energy-conservation method for calcinating for gangue active, its (employing equipment) concrete steps comprise:
(1) by gangue after crushing and grinding 1 is processed, send into pyrolysis calcining furnace 2, because lacking oxygen in stove, combustion reaction does not occur substantially, the temperature in fluidized bed pyrolysis calcining furnace 2 is evenly controlled; Ature of coal low temperature distillation in pyrolytic process in gangue, the similar coke-stove gas of volatile matter, kaolinite decomposes activation;
(2) material after activation reacts with acid or alkali etc. in leacher 3, extracts useful constituent, and reactant is through solid-liquid separator 4 separation; After separating obtained solid drying, enter one-level combustion furnace 5, pass into appropriate air, make ature of coal generation imperfect combustion, oxygen consumes completely, it is main high-temperature gas that carbon monoxide and nitrogen are take in generation, and this gas enters pyrolysis calcining furnace 2 as fluidized gas and partial thermal decomposition heat is provided;
(3) coal gas, tar gas and hot gas that in the solid that one-level combustion furnace 5 is discharged and pyrolysis calcining furnace 2, ature of coal destructive distillation produces enter secondary firing stove 6, fully burning under the condition of excess air, and the high-temperature flue gas of generation enters pyrolysis fluid bed as thermal source; The high-temperature gas that pyrolysis calcining furnace 2 is discharged is for carrying out preheating to entering the gangue of pyrolysis oven with the leaching slag that enters one-level combustion furnace 5, and the high temperature spoil ash sensible heat that the high-temperature activation spoil that pyrolysis calcining furnace 2 is discharged and secondary firing stove 6 are discharged enters the air of one-level combustion furnace 5 and secondary firing stove 6 for preheating.
5 embodiment are below provided.
embodiment 1
The gangue of carbon containing 4%, aluminium oxide 39.23% is broken, grinding is extremely all less than 120 μ m, at 550 ℃, pyrolysis is 30 minutes, after leaching, the appropriate coal of filter residue admixture of isolated by filtration is sent into combustion furnace, one-level furnace temperature is 800 ℃, and secondary firing furnace temperature is 900 ℃; Leaching condition is 20% hydrochloric acid for add concentration by solid-to-liquid ratio 1:4, leaches 60 minutes at 90 ℃, and leaching rate of alumina is 87.95%.
embodiment 2
The gangue of carbon containing 8%, aluminium oxide 38.22% is broken, grinding is extremely all less than 10 μ m, at 600 ℃, pyrolysis is 10 minutes, after leaching, the appropriate coal of filter residue admixture of isolated by filtration is sent into combustion furnace, one-level furnace temperature is 900 ℃, and secondary firing furnace temperature is 1300 ℃; Leaching condition is 20% hydrochloric acid for add concentration by solid-to-liquid ratio 1:4, leaches 60 minutes at 90 ℃, and leaching rate of alumina is 92.30%.
embodiment 3
The gangue of carbon containing 12%, aluminium oxide 35.37% is broken, grinding is extremely all less than 75 μ m, at 650 ℃, pyrolysis is 15 minutes, after leaching, the filter residue of isolated by filtration is directly sent into combustion furnace, one-level furnace temperature is 850 ℃, and secondary firing furnace temperature is 1000 ℃; Leaching condition is 20% hydrochloric acid for add concentration by solid-to-liquid ratio 1:4, leaches 60 minutes at 90 ℃, and leaching rate of alumina is 90.23%.
embodiment 4
The gangue of carbon containing 20%, aluminium oxide 33.18% is broken, grinding is extremely all less than 10 μ m, at 600 ℃, calcine 30 minutes, after leaching, the filter residue of isolated by filtration is sent into combustion furnace, one-level furnace temperature is 900 ℃, secondary firing furnace temperature is 1100 ℃, and the high-temperature gas that secondary firing stove produces partly enters other workshop sections provides energy.Leaching condition is 20% hydrochloric acid for add concentration by solid-to-liquid ratio 1:4, leaches 60 minutes at 90 ℃, and leaching rate of alumina is 92.10%.
embodiment 5
The gangue of carbon containing 40%, aluminium oxide 23.37% is broken, grinding is extremely all less than 10 μ m, at 650 ℃, calcine 15 minutes, after leaching, the filter residue of isolated by filtration is sent into combustion furnace, one-level furnace temperature is 800 ℃, secondary firing furnace temperature is 1000 ℃, and the high-temperature gas that secondary firing stove produces partly enters other workshop sections provides energy.Leaching condition is 20% hydrochloric acid for add concentration by solid-to-liquid ratio 1:4, leaches 60 minutes at 90 ℃, and leaching rate of alumina is 92.52%.
Claims (1)
1. an energy-conservation method for calcinating that improves gangue active, is characterized in that, comprises the following steps:
(1) crushing and grinding gangue is broken, grinding, in fluidized bed pyrolysis calcining furnace, pyrolysis 10～30 minutes at 550～650 ℃, obtains active coal gangue;
(2) active coal gangue step (1) being obtained in leacher with acid or alkali reaction, extract useful constituent, reactant is separated through solid-liquid separator; After separating obtained solid drying, send in one-level combustion furnace and burn, pass into appropriate air and make coal dust generation imperfect combustion, reaction temperature is 800～900 ℃, and the reaction time is 30～60 minutes, obtain solid product spoil burnt, reaction generates that to take nitrogen and carbon monoxide be main high-temperature gas;
(3) spoil Jiao who step (2) is obtained sends into the burning of secondary firing stove, the pyrolysis gas that step (1) pyrolysis calcining furnace is produced is sent into the burning of secondary firing stove, pass into excess air, reaction temperature is 900～1300 ℃, and obtaining solid product spoil ash and take nitrogen and carbon dioxide is main high-temperature gas;
Described pyrolysis is to take the high-temperature gas of one-level combustion furnace as fluidized gas, and the high-temperature gas of secondary firing stove of take is thermal source gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010593991.0A CN102553882B (en) | 2010-12-17 | 2010-12-17 | Energy-saving calcining method for increasing activity of coal gangue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010593991.0A CN102553882B (en) | 2010-12-17 | 2010-12-17 | Energy-saving calcining method for increasing activity of coal gangue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102553882A CN102553882A (en) | 2012-07-11 |
| CN102553882B true CN102553882B (en) | 2014-03-26 |
Family
ID=46401255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010593991.0A Active CN102553882B (en) | 2010-12-17 | 2010-12-17 | Energy-saving calcining method for increasing activity of coal gangue |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102553882B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112851154B (en) * | 2021-03-08 | 2022-07-22 | 韶关市柏林再生资源开发有限公司 | Coal gangue activity excitation and color change method |
| CN113772702A (en) * | 2021-09-06 | 2021-12-10 | 眉山顺应循环再生资源有限公司 | Method for producing alumina by self-producing heat energy of coal gangue |
| CN114838342B (en) * | 2022-05-06 | 2023-07-14 | 西安交通大学 | Gangue fractional pyrolysis decarburization and waste heat cascade utilization system and operation method |
| CN117509638A (en) * | 2023-11-08 | 2024-02-06 | 武汉中科先进材料科技有限公司 | Method and system for continuously preparing silicon-carbon material by coupling organic solid waste and silicon-rich solid waste |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082685A (en) * | 1992-05-22 | 1994-02-23 | 福斯特·惠勒能源公司 | The multistage stove of firing coal pyrolysis gas and coke |
| CN2517518Y (en) * | 2002-01-04 | 2002-10-23 | 刘志惇 | Ecological integrated utilizing prodn. appts. for gangue |
| CN1632436A (en) * | 2005-01-18 | 2005-06-29 | 中国科学院过程工程研究所 | Fast fluidized calcining process |
| CN1915829A (en) * | 2006-09-08 | 2007-02-21 | 刘希林 | Method for preparing aluminium sulphate, sodium silicate, and derivative products from coal slack |
| CN101234774A (en) * | 2008-03-04 | 2008-08-06 | 华东理工大学 | Method for preparing aluminum oxide from coal series kaolinite rock or coal gangue |
| CN101450811A (en) * | 2008-10-23 | 2009-06-10 | 长春市超威新材料科技有限公司 | Method for extracting alumina from coal gangue |
| CN101691501A (en) * | 2009-09-30 | 2010-04-07 | 浙江大学 | Coal-grading conversion poly-generation device and method for producing coal gas, tar and carbocoal on circulating fluid bed |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3153091B2 (en) * | 1994-03-10 | 2001-04-03 | 株式会社荏原製作所 | Waste treatment method and gasification and melting and combustion equipment |
| JPH09176752A (en) * | 1995-12-25 | 1997-07-08 | Nippon Light Metal Co Ltd | Simultaneous treatment of aluminum dross remaining ash and aluminum sludge |
-
2010
- 2010-12-17 CN CN201010593991.0A patent/CN102553882B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082685A (en) * | 1992-05-22 | 1994-02-23 | 福斯特·惠勒能源公司 | The multistage stove of firing coal pyrolysis gas and coke |
| CN2517518Y (en) * | 2002-01-04 | 2002-10-23 | 刘志惇 | Ecological integrated utilizing prodn. appts. for gangue |
| CN1632436A (en) * | 2005-01-18 | 2005-06-29 | 中国科学院过程工程研究所 | Fast fluidized calcining process |
| CN1915829A (en) * | 2006-09-08 | 2007-02-21 | 刘希林 | Method for preparing aluminium sulphate, sodium silicate, and derivative products from coal slack |
| CN101234774A (en) * | 2008-03-04 | 2008-08-06 | 华东理工大学 | Method for preparing aluminum oxide from coal series kaolinite rock or coal gangue |
| CN101450811A (en) * | 2008-10-23 | 2009-06-10 | 长春市超威新材料科技有限公司 | Method for extracting alumina from coal gangue |
| CN101691501A (en) * | 2009-09-30 | 2010-04-07 | 浙江大学 | Coal-grading conversion poly-generation device and method for producing coal gas, tar and carbocoal on circulating fluid bed |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102553882A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104016596B (en) | A kind of rotary kiln with power generation assembly | |
| CN105858660B (en) | The system and method for preparing calcium carbide | |
| CN102978659B (en) | A kind of Deep method of comprehensive utilization of electrolytic cell overhaul slag | |
| CN109136539B (en) | Integrated process of fluidized bed two-stage gasification and flash light burning magnesite | |
| Balomenos et al. | Efficient and complete exploitation of the bauxite residue (red mud) produced in the Bayer process | |
| CN104129929B (en) | The method and apparatus of a kind of calcined limestone, power generating simultaneously reduced iron | |
| CN102553882B (en) | Energy-saving calcining method for increasing activity of coal gangue | |
| CN109928413A (en) | A kind of sintering denitrogenation of aluminium ash soda synchronizes the method for preparing sodium aluminate | |
| CN104163455A (en) | Method for preparing chromium salt | |
| CN104058608B (en) | A kind of shaft furnace of partition heated material | |
| CN111763791A (en) | Iron-containing red mud coal-based direct reduction process and system | |
| CN102701220A (en) | Method for preparing white carbon black by oxygen-free high-temperature calcination and thermal activation of coal gangue | |
| CN203947031U (en) | A kind of rotary kiln with power generation assembly | |
| CN105314894A (en) | Rotary kiln device and method for indirectly producing lime and recycling carbon dioxide | |
| CN103864086B (en) | A kind of method utilizing Boron Slag to manufacture borax | |
| CN202868672U (en) | Coal gangue fluidized slow-release combustion calcining furnace | |
| CN104059681A (en) | Regenerative type combustion gas radiant tube revolving bed oil shale dry distillation method and shale slag utilization technology | |
| CN103708460A (en) | Method for preparing calcium carbide | |
| CN102899093B (en) | High-efficiency cleaning coal gasifying process | |
| CN103708459A (en) | Method for preparing calcium carbide | |
| CN106564901A (en) | Manufacturing technique for producing lime carbon pellets through pyrolytic semi-coke | |
| CN108342207A (en) | A kind of limestone calcination and coal gasification and the method for destructive distillation coproduction | |
| CN204125382U (en) | A kind of partition shaft furnace with power generation assembly | |
| CN204625479U (en) | A kind of indirect calcination is produced lime, is reclaimed the rotary kiln device of carbonic acid gas | |
| CN204022689U (en) | A kind of telescopic shaft furnace with power generation assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |