CN103332695A - Secondary drying method for white carbon black - Google Patents
Secondary drying method for white carbon black Download PDFInfo
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- CN103332695A CN103332695A CN2013102333211A CN201310233321A CN103332695A CN 103332695 A CN103332695 A CN 103332695A CN 2013102333211 A CN2013102333211 A CN 2013102333211A CN 201310233321 A CN201310233321 A CN 201310233321A CN 103332695 A CN103332695 A CN 103332695A
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Abstract
The invention relates to a secondary drying method for white carbon black. The secondary drying method comprises the following steps of: 1, drying white carbon black slurry for the first time by using a spray drying method, wherein the temperature of hot air required by drying is 450-480 DEG C, the drying time is 20-30s, and the temperature of tail gas obtained after the drying is 80-90 DEG C; 2, catching white carbon black powder by using a filter bag, and then, directly delivering the white carbon black powder into a pneumatic drying tower to be dried for the second time, wherein the white carbon black powder is obtained after the first drying, the temperature of hot air required by drying is 150-180 DEG C, the drying time is 30-50s, and the temperature of tail gas obtained after the drying is 110-120 DEG C; and 3, catching the white carbon black powder by using a filter bag, and then, packaging the white carbon black powder in vacuum, wherein the white carbon black powder is obtained after the secondary drying. The secondary drying method is adopted, so that the water content of the white carbon black powder is stably controlled below 2wt%, the production control difficulty is lowered, the quality of a product is improved, the production energy consumption is greatly reduced, and the production efficiency is greatly increased.
Description
Technical field
The present invention relates to the white carbon black production technical field, is a kind of white carbon black redrying method specifically.
Background technology
It is white reinforced type powder body material that white carbon black belongs to silicon, is the general name of synthetic hydrated silicon acid and silicate, comprises precipitation SiO
2, gas phase SiO
2, CaOnSiO
2, MgOnSiO
2, Al
2O
2NSiO
2Deng.Because they have the performance that compares favourably with carbon black and are the characteristic of white in appearance, so be referred to as white carbon black.
In the production process of white carbon black, drying is a very important procedure.Along with white carbon black industry production continuous advancement in technology, great variety has also taken place in the drying means of white carbon black.The box-type drying of energy consumption height, inefficiency is eliminated, main employing is spraying drying and expansion drying at present, take all factors into consideration energy consumption and production efficiency, what general white carbon black slurry adopted is spraying drying, the scope of moisture controlled is between 4～8wt%, this white carbon black only can use as general use at rubber industry, and for the white carbon black of some special purpose, then requires moisture content to be lower than 2wt%.Because there is a large amount of hydroxyls in the white carbon black molecular surface, water-absorbent is very strong, and once be mingled with a large amount of water vapors in the spray-dired tail gas, therefore the white carbon black powder that obtains by spraying drying is easy to and absorbs moisture from tail gas be difficult to form the white carbon black that moisture content is lower than 2wt%, and the quality of product is difficult to guarantee.In order to make the white carbon black that moisture content is lower than 2wt% as far as possible, existing way normally improves hot blast temperature and prolongs time of drying, make moisture single vaporization in the white carbon black slurry to 2wt%, and make once spray-dired exhaust temperature reach (usually between 110～120 ℃) more than 110 ℃, absorb water from tail gas thereby suppress dried white carbon black powder, reach the purpose of control water-content.This way has not only increased production energy consumption greatly, reduced production efficiency, and the quality of product is very unstable, the a large amount of heat energy that contain in the tail gas also can't be utilized effectively and make energy utilization rate very low, do not meet the country and environmental protection of enterprise is energy-conservation and the demand for development of low-cost high yield.
Summary of the invention
In order to overcome the defective of above-mentioned prior art, technical problem to be solved by this invention provides a kind of white carbon black redrying method, this method is simple to operation, the water-content of white carbon black can be stablized control below 2wt%, and production energy consumption reduces greatly, production efficiency also greatly improves.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of white carbon black redrying method may further comprise the steps:
Step 1, employing spray-drying process dialogue carbon black slurry carry out the drying first time, and dry required hot blast temperature is 450～480 ℃, and be 20～30s time of drying, and the exhaust temperature that obtains after the drying is 80～90 ℃;
Step 2, the white carbon black powder that will obtain after the drying first time are directly sent into after the bag filter captures and are carried out the drying second time in the air stream drying tower, dry required hot blast temperature is 150～180 ℃, be 30～50s time of drying, and the exhaust temperature that obtains after the drying is 110～120 ℃;
Step 3, the white carbon black powder that will obtain after the drying second time capture the final vacuum packing through the bag filter.
The present invention has following distinctive points and beneficial effect than prior art:
1, adopts the redrying method, make that the white carbon black slurry is dry at twice to obtain the powder that water-content is lower than 2wt%.Because need not to consider the suction problem of white carbon black powder when for the first time dry, water content requires also lower (after measured between 4～8wt%), so drying temperature, time of drying and exhaust temperature control are compared a spray-drying process and are all reduced greatly; And for the second time dry be the white carbon black powder, its water content lower (4～8wt%), therefore in lower temperature (150～180 ℃) and short time, the water content of white carbon black powder can be reduced to below the 2wt%.From above two point analysiss as can be known, second stage drying method of the present invention is compared spray-drying process one time, greatly reduce production energy consumption and enhance productivity, and only contain a spot of water vapor in the tail gas that obtains after the drying for the second time, therefore exhaust temperature control can effectively prevent the suction of white carbon black powder between 110～120 ℃, the water-content of stable control product is below 2wt%, reduce the difficulty of quality control, improved the stability of product quality;
2, the white carbon black powder that obtains after the drying first time is directly sent into after the bag filter captures and is carried out the drying second time in the air stream drying tower, has effectively avoided the heat of white carbon black powder to scatter and disappear, thus the reduction production energy consumption;
3, the white carbon black powder that obtains after the drying for the second time captures the final vacuum packing through the bag filter, has thoroughly stopped the problem that product contingent suction etc. in wrapping process influences quality, guarantees product stay in grade before use.
For optimization production configuration and minimizing energy consumption, described first time dry required hot blast with dry required hot blast for the second time from same hotblast stove, for the first time dry required hot blast is directly provided by hotblast stove, obtains after the hot blast that then provided by hotblast stove of dry required hot blast is allocated with freezing air for the second time.
In order to realize the recycle of dried tail gas for the second time, improve energy utilization rate and energy-saving and cost-reducing, the tail gas that obtain after the drying the described second time turns back to after purifying treatment in the described hotblast stove.
In order to improve the utilization ratio of tail gas for the first time, reduce quantity discharged, the tail gas that obtain after the drying the described first time is through spray column spray recovery water vapor wherein.
In order to realize the recycle of tail gas for the first time, improve energy utilization rate and energy-saving and cost-reducing, the tail gas behind the recycle-water steam turns back in the described hotblast stove after gas-liquid separation and purifying treatment.
In order to improve drying efficiency and drying effect, in step 2, dry required hot blast blows the white carbon black powder with the flow velocity of 1～3m/s from the bottom up, and at interval or be provided with the flow-stopping plate that the shape in the shape of a spiral of some amount distributes continuously, make the white carbon black powder be the outlet that the eddy current shape is delivered to the air stream drying tower in the air stream drying tower.
Description of drawings
Figure 1 shows that the process flow sheet of the embodiment of the invention.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, realized purpose and effect, give explanation below in conjunction with embodiment and conjunction with figs. are detailed.
See also shown in Figure 1ly, the white carbon black redrying method of present embodiment may further comprise the steps:
Step 1, employing spray-drying process dialogue carbon black slurry carry out the drying first time, and dry required hot blast temperature is 450～480 ℃, and be 20～30s time of drying, and the exhaust temperature that obtains after the drying is 80～90 ℃;
Wherein, spraying drying can be carried out in spray-drying tower, in spray-drying tower, provide dry 450～480 ℃ required hot blast by hotblast stove, the water content of the white carbon black powder that obtains after the drying between 4～8wt%, contains the water vapor of a large amount of temperature between 80～90 ℃ after measured in the tail gas that obtains after the drying.
Step 2, the white carbon black powder that will obtain after the drying first time are directly sent into after the bag filter captures and are carried out the drying second time in the air stream drying tower, dry required hot blast temperature is 150～180 ℃, be 30～50s time of drying, and the exhaust temperature that obtains after the drying is 110～120 ℃;
Wherein, the bag filter captures and can carry out in bag filtrate storehouse one, bag filtrate storehouse one is connected with the outlet of spray-drying tower, be used for capturing the white carbon black powder of water content between 4～8wt% that obtains after the spray-dried tower drying, and isolate the tail gas (dried tail gas for the first time) that contains the water vapour of a large amount of temperature between 80～90 ℃.The white carbon black powder that traps directly enters and carries out the drying second time in the air stream drying tower, middle without other transition operations (as transhipment, temporary shelve etc.), therefore effectively avoid the heat of white carbon black powder to scatter and disappear, reduced dry required production energy consumption for the second time.Because dry for the second time object is the white carbon black powder of water content between 4～8wt%, therefore the water content of white carbon black powder can be reduced to below the 2wt% in lower temperature (150～180 ℃) with in than the short time, and only contain a spot of water vapor in the tail gas that obtains after the drying for the second time, exhaust temperature control is between 110～120 ℃, therefore can effectively prevent the suction of white carbon black powder, make the stable control of water-content of the white carbon black powder that obtains after the drying second time below 2wt%, reduce the difficulty of production control, improved the stability of product quality.The then directly emptying or do other processing of the one isolated tail gas that contains the water vapor of a large amount of temperature between 80～90 ℃ (dried tail gas for the first time) through bag filtrate storehouse.
In this step, in order to improve drying efficiency and drying effect, dry required hot blast blows the white carbon black powder with the flow velocity of 1～3m/s from the bottom up, and at interval or be provided with the flow-stopping plate that the shape in the shape of a spiral of some amount distributes continuously, make the white carbon black powder be the outlet that the eddy current shape is delivered to the air stream drying tower in the air stream drying tower.
In this step, for the second time dry required hot blast can be provided by a hotblast stove separately, also can be by providing same hotblast stove of hot blast to provide to dry for the first time, for optimization production configuration and minimizing energy consumption, the present invention preferably adopt a hotblast stove come simultaneously for for the first time dry and for the second time drying hot blast is provided, so can reduce equipment cost, improve plant factor, the energy consumption of minimizing equipment, the layout at optimization production scene, producers only need be responsible for operating a hotblast stove simultaneously, and the operation and maintenance cost also reduces greatly.Because for the second time dry required hot blast temperature only need reach 150～180 ℃, therefore blast a certain amount of freezing air in 450～480 ℃ the hot blast that a blower unit provides to hotblast stove and allocate to obtain 150～180 ℃ hot blast by arranging, so also reduced the usage quantity of hot blast, make the hot blast rate that needs two hotblast stoves to satisfy originally be reduced to by a hotblast stove and can satisfy, realized producing the optimization of configuration.
In this step, in order to take full advantage of the water vapor in the tail gas that obtains after the drying first time, improve energy utilization rate and reduce the exhaust emissions amount, this tail gas can be further through spray column spray back recovery water vapor wherein, the hot water that recovery obtains can be used for the washing leaching cake operation of white carbon black or is used as other purposes, thereby improves energy utilization rate and reduce the exhaust emissions amount; Form moisture warm air through the tail gas behind the spray owing to still containing more heat energy and having carried the water droplet that brings because of spray secretly, in order further to improve energy utilization rate, reach the requirement of tail gas zero release simultaneously, the tail gas that obtains behind the spray can also carry out gas-liquid separation by gas-liquid separator again, 99% liquid moisture is wherein removed and obtained dry warm air (temperature is about 80 ℃ after measured), after the purifying treatment of this dry warm air through purifying bellows, can obtain meeting the Purge gas of hotblast stove service requirements, these Purge gas namely can be used as spray-drying tower or the dry required hot blast of air stream drying tower enter the high-temperature hot-air that further adds 450～480 ℃ of thermosettings in the hotblast stove under the induced draft fan effect of hotblast stove after, so realized the recycle of dried tail gas for the first time, greatly reduce the energy that the hotblast stove heated air consumes, after measured, the clean air temperature of existing supply hotblast stove is generally at 25～30 ℃, and the present invention is by recycling dried tail gas for the first time, the Purge gas of supplying with hotblast stove can be lacked than the clean air of existing supply hotblast stove heat up 50～55 ℃, hotblast stove can save energy more than 10%.
Step 3, the white carbon black powder that will obtain after the drying second time capture the final vacuum packing through the bag filter.
Wherein, the bag filter captures and can carry out in bag filtrate storehouse two, bag filtrate storehouse two is connected with the outlet of air stream drying tower, be used for capturing the white carbon black powder of water content below 2wt% that after air stream drying tower drying, obtains, and isolate the tail gas (dried tail gas for the second time) that contains the water vapour of a spot of temperature between 110～120 ℃.The white carbon black powder that traps directly carries out vacuum packaging, thereby thoroughly stops the problem that the contingent suction etc. in wrapping process of white carbon black powder influences product quality, guarantees product stay in grade before use.The then directly emptying or do other processing of the two isolated tail gas that contain the water vapor of a spot of temperature between 110～120 ℃ (dried tail gas for the second time) through bag filtrate storehouse.
In this step, owing to only contain a spot of water vapor in the dried tail gas for the second time, therefore dried tail gas only need pass through the Purge gas that the purifying treatment that purifies bellows can obtain meeting the hotblast stove service requirements for the second time, take full advantage of contained heat in the dried tail gas second time thereby reach, improve the purpose of energy utilization rate.These Purge gas namely can be used as spray-drying tower or the dry required hot blast of air stream drying tower enter the high-temperature hot-air that further adds 450～480 ℃ of thermosettings in the hotblast stove under the induced draft fan effect of hotblast stove after, so realized the recycle of dried tail gas for the second time, reached the purpose of tail gas zero release, and greatly reduce the energy that the hotblast stove heated air consumes, the Purge gas of supplying with hotblast stove can be lacked than the clean air of existing supply hotblast stove heat up 80～95 ℃, hotblast stove can save energy more than 12%.Simultaneously, because dried tail gas itself is exactly the clean air that forms by secondary bag filter back for the second time, therefore when handling, bellows can not make filter screen or the cloth bag set of surfaces ash that purifies in the bellows through purifying, thereby reduced the collection ash degree on filter screen or cloth bag surface, the resistance that makes air pass filter screen or cloth bag reduces, make the hotblast stove induced draft fan under relatively low load, can blast the clean air of q.s, prolong hotblast stove work-ing life and energy saving purposes thereby reach.This step can arrange the purification bellows separately, also can adopt same the purification bellows used with step 2, thereby reach the purpose of optimization production configuration, namely reduce equipment cost, improve plant factor, the energy consumption of minimizing equipment, the layout at optimization production scene reduces the operation and maintenance cost simultaneously.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification sheets of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (6)
1. a white carbon black redrying method is characterized in that, may further comprise the steps:
Step 1, employing spray-drying process dialogue carbon black slurry carry out the drying first time, and dry required hot blast temperature is 450～480 ℃, and be 20～30s time of drying, and the exhaust temperature that obtains after the drying is 80～90 ℃;
Step 2, the white carbon black powder that will obtain after the drying first time are directly sent into after the bag filter captures and are carried out the drying second time in the air stream drying tower, dry required hot blast temperature is 150～180 ℃, be 30～50s time of drying, and the exhaust temperature that obtains after the drying is 110～120 ℃;
Step 3, the white carbon black powder that will obtain after the drying second time capture the final vacuum packing through the bag filter.
2. white carbon black redrying method according to claim 1, it is characterized in that: described first time dry required hot blast with dry required hot blast for the second time from same hotblast stove, for the first time dry required hot blast is directly provided by hotblast stove, obtains after the hot blast that then provided by hotblast stove of dry required hot blast is allocated with freezing air for the second time.
3. white carbon black redrying method according to claim 2, it is characterized in that: the tail gas that obtain after the drying the described second time turns back to after purifying treatment in the described hotblast stove.
4. white carbon black redrying method according to claim 2 is characterized in that: the tail gas that obtain after the drying the described first time reclaims wherein water vapor through the spray column spray.
5. white carbon black redrying method according to claim 4, it is characterized in that: the tail gas behind the recycle-water steam turns back in the described hotblast stove after gas-liquid separation and purifying treatment.
6. white carbon black redrying method according to claim 1, it is characterized in that: in step 2, dry required hot blast blows the white carbon black powder with the flow velocity of 1～3m/s from the bottom up, and at interval or be provided with the flow-stopping plate that the shape in the shape of a spiral of some amount distributes continuously, make the white carbon black powder be the outlet that the eddy current shape is delivered to the air stream drying tower in the air stream drying tower.
The present invention relates to a kind of white carbon black redrying method, may further comprise the steps: step 1, employing spray-drying process dialogue carbon black slurry carry out the drying first time, wherein, dry required hot blast temperature is 450～480 ℃, be 20～30s time of drying, and the exhaust temperature that obtains after the drying is 80～90 ℃; Step 2, the white carbon black powder that will obtain after the drying first time are directly sent into after the bag filter captures and are carried out the drying second time in the air stream drying tower, dry required hot blast temperature is 150～180 ℃, be 30～50s time of drying, and the exhaust temperature that obtains after the drying is 110～120 ℃; Step 3, the white carbon black powder that will obtain after the drying second time capture the final vacuum packing through the bag filter.The present invention adopts the redrying method, makes the stable control of water content of white carbon black powder below 2wt%, has reduced the difficulty of production control, has improved product quality, and has greatly reduced production energy consumption and enhance productivity.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537106A (en) * | 2013-10-28 | 2014-01-29 | 凤阳海泰科能源环境管理服务有限公司 | White carbon black spraying and drying system and method |
| CN105195065A (en) * | 2015-08-26 | 2015-12-30 | 中国科学院化学研究所 | Device for powder filler surface modification and using method thereof |
| CN110787524A (en) * | 2019-11-08 | 2020-02-14 | 协鑫高科纳米新材料(徐州)有限公司 | Separator for producing fumed silica |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774591A (en) * | 2010-02-26 | 2010-07-14 | 无锡恒诚硅业有限公司 | Production technology of white microsphere high-strength white carbon black |
| CN102564094A (en) * | 2010-12-22 | 2012-07-11 | 上海宝钢磁业有限公司 | Secondary drying method for manganese-zinc ferrite powder |
-
2013
- 2013-06-13 CN CN201310233321.1A patent/CN103332695B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774591A (en) * | 2010-02-26 | 2010-07-14 | 无锡恒诚硅业有限公司 | Production technology of white microsphere high-strength white carbon black |
| CN102564094A (en) * | 2010-12-22 | 2012-07-11 | 上海宝钢磁业有限公司 | Secondary drying method for manganese-zinc ferrite powder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537106A (en) * | 2013-10-28 | 2014-01-29 | 凤阳海泰科能源环境管理服务有限公司 | White carbon black spraying and drying system and method |
| CN103537106B (en) * | 2013-10-28 | 2016-01-20 | 凤阳海泰科能源环境管理服务有限公司 | A kind of white carbon spray drying system and method |
| CN105195065A (en) * | 2015-08-26 | 2015-12-30 | 中国科学院化学研究所 | Device for powder filler surface modification and using method thereof |
| CN110787524A (en) * | 2019-11-08 | 2020-02-14 | 协鑫高科纳米新材料(徐州)有限公司 | Separator for producing fumed silica |
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