CN102653403B - Process method for preparing calcium carbide by recycling calcium carbide slag - Google Patents
Process method for preparing calcium carbide by recycling calcium carbide slag Download PDFInfo
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- CN102653403B CN102653403B CN201210152852.3A CN201210152852A CN102653403B CN 102653403 B CN102653403 B CN 102653403B CN 201210152852 A CN201210152852 A CN 201210152852A CN 102653403 B CN102653403 B CN 102653403B
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- calcium carbide
- carbide slag
- carbide
- tail gas
- slag
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Abstract
The invention discloses a process method for preparing calcium carbide by recycling calcium carbide slag. The process method is characterized by comprising the following steps of: (1) dehydrating the calcium carbide slag, generating calcium carbide slag raw materials, and drying carbocoal; (2) adding the calcium carbide slag raw materials and the carbocoal into a calcium carbide furnace for smelting to generate the calcium carbide, calcium carbide sensible heat and tail gas; (3) collecting the tail gas generated by step (2), and separating calcium carbide tail gas dust and gas from the tail gas; and (4) inletting the gas separated from the tail gas into a lime kiln for calcinating the limestone, and generating quick lime, then adding the quick lime and the dried semicoke into the calcium carbide furnace and smelting into the calcium carbide. According to the process method, the calcium carbide slag can be recycled, so that labors and resources for treating the calcium carbide slag serving as waste are saved, and the resource utilization rate is increased; and moreover, the tail gas produced by generation of the calcium carbide is fully and effectively used, so that the method is suitable for popularization and application.
Description
Technical field
The present invention relates to a kind of process of preparing calcium carbide, specifically refer to a kind of process that carbide slag is prepared calcium carbide that reclaims.
Background technology
In the time using calcium carbide to prepare acetylene or polyvinyl chloride, will produce a large amount of carbide slags, the main component of carbide slag is Ca (OH) 2.Carbide slag slurries water content is large and alkalescence is high, is the major polluting sources of sewage network.The long-term accumulation of carbide slag not only takies a large amount of soils, and there is to serious corrosion function in soil.Therefore, national environmental protection portion has included carbide slag in II class general industrial solid waste, requires to manage.At present, the carbide slag producing in production process is all as offal treatment, and therefore, processing these carbide slag discarded objects not only needs to spend a large amount of manpower and materials, has also caused the waste of resource.
Summary of the invention
The object of the invention is to overcome is at present all not only to need to spend a large amount of manpower and materials as offal treatment using the carbide slag producing in production process, also cause the defect of the waste of resource, provide a kind of carbide slag can be recycled a kind of to reclaim the process that carbide slag is prepared calcium carbide.
The present invention is achieved through the following technical solutions: a kind ofly reclaim the process that carbide slag is prepared calcium carbide, comprise the following steps:
(1) carbide slag is carried out to processed, and generate carbide slag raw material, dry blue carbon simultaneously;
(2) add smelting in furnace of calcium carbide to produce calcium carbide carbide slag raw material and blue carbon, and produce acetylene stones sensible heat and tail gas;
(3) tail gas step (2) being produced is collected, and from tail gas, isolates calcium carbide tail gas dust and combustion gas;
(4) will be from tail gas isolated combustion gas pass in limekiln lime stone calcined, and generate quick lime, then by quick lime with dry after blue carbon add in furnace of calcium carbide and smelt and generate calcium carbide.
Further, step (1) is used acetylene stones sensible heat to dry blue carbon.
In order to satisfy the demand, the carbide slag dehydration in described step (1) realizes through the following steps:
(1a) carbide slag is dewatered;
(1b), by carbide slag and calcium carbide tail gas mix dust and push balling-up, generate carbide slag mixed material;
(1c) carbide slag mixed material is added in carbide slag kin and dewatered, and generate carbide slag raw material.
In order to better meet needs, the water content of the carbide slag after described step (1a) dehydration is less than 15%.
For the ease of recycling blue carbon dust, in described carbide slag mixed material, be also added with blue carbon dust.
In order better to realize the present invention, in step (1b), use isolated combustion gas from tail gas to calcine carbide slag mixed material.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention utilizes the carbide slag of recovery to prepare calcium carbide as raw material, has therefore saved using carbide slag as the required manpower and materials of offal treatment, has also improved the utilization rate of material simultaneously, has therefore saved resource.
(2) blue carbon of the present invention uses the acetylene stones sensible heat of smelting calcium carbide generation to dry, and has therefore utilized fully the energy producing in production process, has improved the utilization rate of the energy, has saved resource.
(3) the present invention reclaims smelting the tail gas that calcium carbide produces, and calcium carbide tail gas dust and combustion gas in tail gas is separated, and therefore can prevent that tail gas from directly discharging and atmosphere pollution can also facilitate subsequent handling to use this calcium carbide tail gas dust and combustion gas.
(4) the present invention generates carbide slag mixed material after calcium carbide tail gas dust is used for mixing with carbide slag, thereby for the preparation of calcium carbide, therefore takes full advantage of this calcium carbide tail gas dust, has improved the utilization rate of raw material, has saved resource.
(5) combustion gas that the present invention produces, for carbide slag drying and carbide slag raw material, therefore takes full advantage of calcium carbide tail gas, has saved the energy.
(6) the present invention also utilizes gas calcining lime stone, thereby generates quick lime, and uses this quick lime to prepare calcium carbide, thereby takes full advantage of the energy of combustion gas, has improved the utilization rate of calcium carbide tail gas; Use this quick lime to prepare calcium carbide simultaneously and can also produce endlessly tail gas, therefore formed the recycling system of tail gas.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
The present invention reclaims discarded carbide slag in order to prepare calcium carbide, and use calcium carbide to produce carbide slag while preparing the product such as acetylene or polyvinyl chloride, and then the carbide slag of generation is reclaimed in order to prepare calcium carbide, thereby therefore the recycling system of formation carbide slag has saved the energy.
While using carbide slag to prepare calcium carbide, need to carry out processed to carbide slag, and generate carbide slag raw material, also need blue carbon to dry simultaneously, then add smelting in furnace of calcium carbide to produce calcium carbide carbide slag raw material and blue carbon.Furnace of calcium carbide also produces acetylene stones sensible heat and tail gas when smelting carbide slag raw material and blue carbon generation calcium carbide, the present invention collects the acetylene stones sensible heat of generation by calcium carbide sensible heat recovery system, then use the acetylene stones sensible heat of this collection to dry blue carbon, therefore utilize fully the energy of acetylene stones sensible heat, thereby saved the energy.
Owing to containing the mixture dust of carbide slag and the formation of blue carbon, i.e. calcium carbide tail gas dust in tail gas; Also contain CO gas, i.e. combustion gas simultaneously; Cause atmosphere pollution in order to prevent this tail gas from directly discharging, cause the waste of the energy simultaneously, the present invention collects this tail gas.The present invention derives by calcium carbide tail gas recovery channel the tail gas that generates in furnace of calcium carbide, then by deduster by calcium carbide tail gas dust separation out, and by this calcium carbide tail gas dust collection in dust storehouse, to recycle.Only contain combustion gas through the tail gas in deduster calcium carbide tail gas recovery channel after treatment, this combustion gas can be directly used in combustion.
Before use carbide slag is produced, need to use carbide slag dewaterer to dewater to carbide slag, the present invention directly will be passed in carbide slag dewaterer carbide slag will be carried out to prebake by calcium carbide tail gas recovery channel through deduster combustion gas after treatment.In order fully to use the calcium carbide tail gas dust reclaiming, this calcium carbide tail gas dust is reused for to smelting calcium carbide, thereby after calcium carbide tail gas dust is mixed with carbide slag, be squeezed into smelt required spherical, this prebake only need remove the free water part of carbide slag, makes the water content of carbide slag be less than 15%.Then the calcium carbide tail gas dust of collection is added in ashes batch mixing mixer and mixed with the carbide slag after dehydration, and generate carbide slag mixed material.
Owing to directly adding, the volume of the blue carbon of smelting in furnace of calcium carbide is all larger, the blue carbon of some small volumes goes out of use, in order to make full use of the blue carbon of the small volume going out of use, this orchid carbon can be added form after mixing with carbide slag mixed material in ashes batch mixing mixer spherical, thereby this orchid carbon is fully used, in order to avoid cause waste.Need before use blue carbon to grind in coal flour mill, blue carbon is formed and mix needed particle diameter with carbide slag mixed material, to guarantee that carbide slag mixed material mixes with this orchid carbon dust and combination is good.Then the blue carbon dust after grinding is also added in ashes batch mixing mixer, blue carbon dust is fully mixed with carbide slag mixed material, and form the carbide slag mixed material that contains blue carbon.This carbide slag mixed material that is mixed with blue carbon added in carbide slag balling head and pushes balling-up, then this spherical mixture is added in carbide slag kin and dewatered, this spherical mixture being dried again.The present invention again will be passed in carbide slag kin spherical carbide slag mixed material is calcined through the combustion gas in deduster calcium carbide tail gas recovery channel after treatment by pipeline, smelt thereby take full advantage of the tail gas that calcium carbide produces, and the carbide slag mixed material of being dried after calcining is carbide slag raw material.
Blue carbon by the carbide slag raw material making above and after drying adds in furnace of calcium carbide to be smelted and can generate calcium carbide, produces endlessly tail gas in furnace of calcium carbide when generating calcium carbide, and this tail gas is again for the preparation of carbide slag raw material.Due to for the preparation of the combustion gas of carbide slag raw material be furnace of calcium carbide produce combustion gas in sub-fraction, in order to make full use of on the spot these combustion gas, to improve resource utilization, the present invention also uses this combustion gas for the preparation of quick lime.When use, combustion gas is passed in limekiln lime stone is calcined, can make full use of combustion gas, and generate quick lime, then the blue carbon by this quick lime and after drying adds smelting in furnace of calcium carbide can generate calcium carbide, produces tail gas simultaneously.Use quick lime and blue carbon effect generation calcium carbide can greatly improve the output of calcium carbide, can also make full use of the tail gas producing in production process simultaneously, and form the cyclic utilization system of tail gas, and therefore improve widely the utilization rate of raw material, save cost and resource.
As mentioned above, just can realize preferably the present invention.
Claims (4)
1. reclaim carbide slag and prepare a process for calcium carbide, it is characterized in that, comprise the following steps:
(1) carbide slag is carried out to processed, and generate carbide slag raw material, dry blue carbon simultaneously;
(2) add smelting in furnace of calcium carbide to produce calcium carbide carbide slag raw material and blue carbon, and produce acetylene stones sensible heat and tail gas;
(3) tail gas step (2) being produced is collected, and from tail gas, isolates calcium carbide tail gas dust and combustion gas;
(4) will be from tail gas isolated combustion gas pass in limekiln lime stone calcined, and generate quick lime, then by quick lime with dry after blue carbon add in furnace of calcium carbide and smelt and generate calcium carbide;
Wherein, the dehydration of the carbide slag in described step (1) realizes through the following steps:
(1a) carbide slag is dewatered;
(1b), by carbide slag and calcium carbide tail gas mix dust and push balling-up, generate carbide slag mixed material, and it is calcined;
(1c) carbide slag mixed material is added in carbide slag kin and dewatered, and generate carbide slag raw material;
And in step (1b), use isolated combustion gas from tail gas to calcine carbide slag mixed material.
2. a kind of process that carbide slag is prepared calcium carbide that reclaims according to claim 1, is characterized in that, step (1) is used acetylene stones sensible heat to dry blue carbon.
3. a kind of process that carbide slag is prepared calcium carbide that reclaims according to claim 2, is characterized in that, the water content of the carbide slag after described step (1a) dehydration is less than 15%.
4. a kind of process that carbide slag is prepared calcium carbide that reclaims according to claim 3, is characterized in that, in described carbide slag mixed material, is also added with blue carbon dust.
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| CN102653403B true CN102653403B (en) | 2014-10-15 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104828824B (en) * | 2015-03-24 | 2017-06-13 | 中国科学院过程工程研究所 | A kind of method that carbide slag prepares calcium carbide with coke powder coforming |
| CN105502460B (en) * | 2015-12-18 | 2017-08-11 | 石河子大学 | Utilize the method for production of calcium carbide from its residue raw material |
| CN105969424A (en) * | 2016-07-07 | 2016-09-28 | 中盐吉兰泰盐化集团有限公司 | System for producing acetylene gas by using recycled calcium carbide dust |
| CN115259990B (en) * | 2022-06-24 | 2023-11-21 | 榆林学院 | Method and system for recycling waste heat and emissions in acetylene production by calcium carbide method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805003A (en) * | 2009-06-08 | 2010-08-18 | 王嘉兴 | Method for using carbide slag for material circulation system in carbide industry |
| CN101816873A (en) * | 2010-05-06 | 2010-09-01 | 云南云维股份有限公司 | Method and device for purifying calcium carbide furnace tail gas by using negative pressure dry process |
| CN101837954A (en) * | 2010-05-18 | 2010-09-22 | 浙江工业大学 | Method for preparing hydrogen by using tail gas of calcium carbide furnace |
| CN102258923A (en) * | 2011-04-29 | 2011-11-30 | 青海宜化化工有限责任公司 | Method for recycling and reusing tail gas of calcium carbide furnace |
| CN202158785U (en) * | 2011-07-29 | 2012-03-07 | 中国五冶集团有限公司 | Closed calcium carbide furnace smoke heat recovery device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035094A (en) * | 1988-02-08 | 1989-08-30 | 重庆建筑工程学院 | Use production of calcium carbide from its residue |
| CN1215974C (en) * | 2003-05-30 | 2005-08-24 | 樊张帆 | Process for preparing high calcium carbide product and producing calcium carbide carbide using calcium carbide waste slag |
| CN101327928A (en) * | 2008-08-01 | 2008-12-24 | 北京化工大学 | Calcium carbide production method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805003A (en) * | 2009-06-08 | 2010-08-18 | 王嘉兴 | Method for using carbide slag for material circulation system in carbide industry |
| CN101816873A (en) * | 2010-05-06 | 2010-09-01 | 云南云维股份有限公司 | Method and device for purifying calcium carbide furnace tail gas by using negative pressure dry process |
| CN101837954A (en) * | 2010-05-18 | 2010-09-22 | 浙江工业大学 | Method for preparing hydrogen by using tail gas of calcium carbide furnace |
| CN102258923A (en) * | 2011-04-29 | 2011-11-30 | 青海宜化化工有限责任公司 | Method for recycling and reusing tail gas of calcium carbide furnace |
| CN202158785U (en) * | 2011-07-29 | 2012-03-07 | 中国五冶集团有限公司 | Closed calcium carbide furnace smoke heat recovery device |
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