CN106350089B - Process for preparing asphalt balls by continuous method - Google Patents
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- CN106350089B CN106350089B CN201610794428.7A CN201610794428A CN106350089B CN 106350089 B CN106350089 B CN 106350089B CN 201610794428 A CN201610794428 A CN 201610794428A CN 106350089 B CN106350089 B CN 106350089B
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- asphalt
- naphthalene
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/14—Solidifying, Disintegrating, e.g. granulating
- C10C3/16—Solidifying, Disintegrating, e.g. granulating by direct contact with liquids
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Abstract
A continuous method for preparing asphalt balls is characterized in that asphalt and naphthalene are added into a stirring and heating kettle to obtain molten modified asphalt, and the molten modified asphalt is extruded from an extrusion hole of an extrusion plate; the extruded molten modified asphalt stays in the air for 1 to 30 seconds, then enters into water, stays for 300 to 900 seconds, and is screened to obtain asphalt balls; when the prepared asphalt balls are 1/4-2/3 of the sum of the weight of the asphalt and the weight of the naphthalene in the stirring and heating kettle, under the condition of no stopping of the operation, the asphalt and the naphthalene are added into the stirring and heating kettle according to the sum of the weight of the initial asphalt and the weight of the naphthalene of 1/5-1/3 so as to supplement the extruded molten modified asphalt, thus realizing the continuity of the whole operation and obtaining continuous asphalt balls. The invention has the advantages of high productivity and stable performance.
Description
Technical Field
The invention belongs to a preparation process of asphalt balls, and particularly relates to a process for preparing asphalt balls by a continuous method.
Background
The preparation of the spherical activated carbon by taking asphalt as a raw material relates to a series of complex preparation processes, and particularly, millimeter-scale asphalt spheres prepared by a suspension method need multiple longitudinal process steps, wherein the balling is a key for restricting the large-scale production of the millimeter-scale asphalt spheres.
At present, in the prior patent reports, the method for preparing the asphalt balls almost adopts an autoclave method or stirring asphalt in a container to obtain the corresponding asphalt balls: for example, chinese invention patent 03178572 "preparation method of pitch-based spherical activated carbon rich in mesopores", chinese invention patent 200410100531 "preparation method of spherical activated carbon", chinese invention patent 200610127621 "preparation method of spherical activated carbon low in heavy metal content", chinese invention patent 200810035853 "preparation method of nitrogen-containing pitch-based spherical activated carbon", chinese invention patent CN201010143602.4 "preparation method of pitch balls", chinese invention patent CN 201310657377.X "technique for preparing pitch balls with low energy consumption by one-step method", chinese invention patent 201210317727 "low energy consumption preparation method of pitch-based spherical activated carbon", and the like all adopt batch-type methods to prepare pitch balls, which will affect the productivity and stability of performance of pitch balls.
Disclosure of Invention
The invention aims to provide a continuous asphalt ball preparation process with high productivity and stable performance.
The preparation process comprises the following steps:
(1) according to the proportion of asphalt: naphthalene weight ratio of 1: (0.2-0.5), adding the asphalt and the naphthalene into a stirring and heating kettle, and obtaining the molten modified asphalt under the conditions of 250-350 ℃ and the stirring speed of 50-300 r/min;
(2) change the melting intoThe temperature of the asphalt is 80-200 ℃, 10-80kg/cm2Extruding from 0.8-3mm extruding holes on the extruding plate under the pressure of (1);
(3) the extruded molten modified asphalt stays in the air for 1 to 30 seconds and then enters water, and stays for 300 to 900 seconds to obtain an asphalt ball;
(4) when the prepared asphalt balls are 1/4-2/3 of the sum of the weight of the asphalt and the weight of the naphthalene in the stirring and heating kettle, under the condition of not stopping the operation, the weight ratio of the initial asphalt to the naphthalene is 1/5-1/3: (0.2-0.5) adding the asphalt and naphthalene into the stirred heating kettle to supplement the extruded molten modified asphalt, thus realizing the continuity of the whole operation and obtaining continuous asphalt balls;
(5) repeating the operations of the steps (1) to (4) above, the pitch balls can be obtained continuously.
The asphalt is high-temperature asphalt with 10-250 meshes and a softening point of 180-290 ℃.
Compared with the prior art, the invention has the following advantages:
the invention is a continuous ball discharging, realizes the continuous preparation from asphalt particles to asphalt balls, and can obviously reduce the operation cost while improving the productivity;
2, after the melted modified asphalt is extruded out and shrunk in the air to form balls, the temperature is reduced by spraying water and water, so that the quantity of naphthalene contained in the modified asphalt is ensured, and the stability of the performance of subsequent products is also ensured;
3, the invention does not need to melt the asphalt and the naphthalene firstly, then crush and screen the asphalt and the naphthalene after the asphalt and the naphthalene are cooled as mentioned in a plurality of patents, thereby not only ensuring the quantity of the naphthalene, but also obviously reducing the operation steps and corresponding equipment;
4, the modified asphalt is not crushed and screened, but is directly extruded into a strip-shaped object to be pelletized, so that all the modified asphalt is utilized, and the method is different from the method that only a small amount of asphalt with proper granularity can be utilized in numerous patents;
5, the modified asphalt is obtained by extrusion, so the sphere diameter of the formed spheres is controlled more accurately;
6 the invention does not need dispersant, which can reduce the using cost of the dispersant and the pollution treatment cost caused by the dispersant.
Drawings
FIG. 1 is a process flow diagram of the present invention.
As shown in the figure, 1 is a charging hopper, 2 is a screw feeder, 3 is a stirring and heating kettle, 4 is an asphalt pressure pump, 5 is a material extruding cylinder, 6 is an overflow pipeline, 7 is a balling kettle, 8 is a spray header, 9 is a screen frame, 10 is a water tank, and 11 is a water pump; m is the motor, V is the valve, T is the temperature measurement, and P is the pressure measurement.
Detailed Description
The specific operation process of the invention is as follows:
firstly, opening a valve V1 and a spiral feeder 2, adding the mixture of asphalt and naphthalene in a feeding hopper 1 into a stirring and heating kettle 3 through the spiral feeder 2, then closing the valve V1 and the spiral feeder 2, starting a heating device of the stirring and heating kettle 3 to heat, when a set constant temperature section is reached, opening the stirring, fully mixing and reacting the materials after stirring for a period of time to obtain the molten modified asphalt, then opening a valve V2 and an asphalt booster pump 4, pumping the molten modified asphalt into an extrusion tank 5, the molten modified asphalt is extruded into a bar through the holes of the extrusion plate under the extrusion tank 5, and at the same time, the valve V3 and the spray pump 11 are opened, the water in the balling tank 7 is overflowed through the spray head 8, the overflowed water flows into the water tank 10 from the overflow pipe 6, the pellets thus formed enter the screen frame 9 through the valve V3, and the pellets are taken out to form the asphalt pellets.
When the prepared asphalt balls are 1/4-2/3 of the sum of the initial asphalt and naphthalene weight in the stirring heating kettle, under the condition of not stopping the operation, opening a valve V1 and a spiral feeder 2, and mixing the asphalt balls in a weight ratio of 1: (0.2-0.5) asphalt and naphthalene are added into the stirred heating kettle 3 through a charging hopper 1 and a spiral feeder 2 to supplement the mixture of the extruded asphalt and naphthalene, so that the continuity of the whole operation can be realized and continuous asphalt balls can be obtained.
Example 1
(1) According to the proportion of asphalt: naphthalene weight ratio of 1: 0.2, adding 250-mesh asphalt with a softening point of 180 ℃ and naphthalene into a stirring and heating kettle 3, and obtaining the molten modified asphalt under the conditions of 250 ℃ and a stirring rotating speed of 300 revolutions per minute;
(2) melting modified asphalt at 200 deg.C and 80kg/cm2Is extruded from an extrusion plate with an extrusion hole of 3mm under the pressure of (1);
(3) and (3) allowing the extruded molten modified asphalt to stay in the air for 30s, then allowing the molten modified asphalt to stay in water for 900s, and obtaining the asphalt balls.
When the prepared asphalt ball is 1/4 of the sum of the weight of the initial asphalt and the weight of the naphthalene in the stirring and heating kettle, under the condition of no stopping of the operation, the weight ratio of the mixture of the initial asphalt and the weight of the naphthalene is 1/5: 0.2 of asphalt and naphthalene were added to the stirred tank heater 3 to supplement the extruded molten modified asphalt, so that the continuity of the whole operation could be achieved and continuous asphalt balls could be obtained. Repeating the above steps can obtain asphalt balls continuously.
The diameter of the obtained asphalt ball is 1.9-2.8 mm.
Example 2
(1) According to the proportion of asphalt: naphthalene weight ratio of 1: 0.5, adding 10 meshes of asphalt with a softening point of 290 ℃ and naphthalene into a stirring and heating kettle 3, and obtaining the molten modified asphalt under the conditions of 350 ℃ and 50 revolutions per minute of stirring speed;
(2) extruding the molten modified asphalt from an extrusion plate with an extrusion hole of 0.8mm at the temperature of 80 ℃ and the pressure of 10kg/cm 2;
(3) and (3) keeping the extruded molten modified asphalt in the air for 1s, then allowing the molten modified asphalt to enter water, and keeping the molten modified asphalt for 300s to obtain the asphalt balls.
When the prepared asphalt ball is 2/3 of the sum of the weight of the initial asphalt and the weight of the naphthalene in the stirring and heating kettle, under the condition of no stopping of the operation, the weight ratio of the mixture of the initial asphalt and the weight of the naphthalene is 1/3: 0.5 of asphalt and naphthalene were added to the stirred tank heater 3 to supplement the extruded molten modified asphalt, so that the continuity of the whole operation could be achieved and continuous asphalt balls could be obtained. Repeating the above steps can obtain asphalt balls continuously.
The diameter of the obtained asphalt ball is 0.3-0.8 mm.
Example 3
(1) According to the proportion of asphalt: naphthalene weight ratio of 1: 0.3, adding 200-mesh asphalt with a softening point of 220 ℃ and naphthalene into a stirring and heating kettle 3, and obtaining the molten modified asphalt under the conditions of 300 ℃ and a stirring rotating speed of 200 revolutions per minute;
(2) extruding the molten modified asphalt from an extrusion plate with an extrusion hole of 1.5mm at the temperature of 150 ℃ and the pressure of 50kg/cm 2;
(3) and (3) allowing the extruded molten modified asphalt to stay in the air for 10s, then allowing the molten modified asphalt to enter water, and allowing the molten modified asphalt to stay for 500s to obtain the asphalt balls.
When the prepared asphalt ball is 1/2 of the sum of the initial asphalt and the weight of the naphthalene in the stirring and heating kettle 3, under the condition of not stopping the operation, the weight ratio of the mixture of the initial asphalt and the weight of the naphthalene is 1: 0.3 of asphalt and naphthalene are added into the stirring and heating kettle 3 to supplement the extruded molten modified asphalt, thus realizing the continuity of the whole operation and obtaining continuous asphalt balls. Repeating the above steps can obtain asphalt balls continuously.
The diameter of the obtained asphalt ball is 1.0-1.4 mm.
Example 4
(1) According to the proportion of asphalt: naphthalene weight ratio of 1: 0.4, adding 30-mesh asphalt with a softening point of 270 ℃ and naphthalene into a stirring and heating kettle 3, and obtaining molten modified asphalt under the conditions of 330 ℃ and a stirring rotating speed of 150 revolutions per minute;
(2) extruding the molten modified asphalt from an extrusion plate with an extrusion hole of 2mm at the temperature of 100 ℃ and the pressure of 30kg/cm 2;
(3) and (3) allowing the extruded molten modified asphalt to stay in the air for 20s, then allowing the molten modified asphalt to enter water, and then allowing the molten modified asphalt to stay for 400s to obtain the asphalt balls.
When the prepared asphalt ball is 1/3 of the sum of the initial asphalt and the weight of the naphthalene in the stirring and heating kettle 3, under the condition of not stopping the operation, the weight ratio of the mixture of the initial asphalt and the weight of the naphthalene is 1: 0.4 of asphalt and naphthalene were added to the stirred tank heater 3 to supplement the extruded molten modified asphalt, so that the continuity of the whole operation could be achieved and continuous asphalt pellets could be obtained. Repeating the above steps can obtain asphalt balls continuously.
The diameter of the obtained asphalt ball is 1.3-1.8 mm.
Example 5
(1) According to the proportion of asphalt: naphthalene weight ratio of 1: 0.25, adding 80-mesh asphalt with a softening point of 250 ℃ and naphthalene into a stirring and heating kettle 3, and obtaining the molten modified asphalt under the conditions of 280 ℃ and a stirring rotating speed of 250 revolutions per minute;
(2) extruding the molten modified asphalt from an extrusion plate with an extrusion hole of 1mm at the temperature of 180 ℃ and the pressure of 60kg/cm 2;
(3) and (3) allowing the extruded molten modified asphalt to stay in the air for 15s, then allowing the molten modified asphalt to enter water, and allowing the molten modified asphalt to stay for 700s to obtain asphalt balls.
When the prepared asphalt ball is 2/3 of the sum of the initial asphalt and the weight of the naphthalene in the stirring and heating kettle 3, under the condition of not stopping the operation, the weight ratio of the mixture of the initial asphalt and the weight of the naphthalene is 1: 0.25 of asphalt and naphthalene were added to the stirred tank heater 3 to supplement the extruded molten modified asphalt, so that the continuity of the whole operation could be achieved and continuous asphalt pellets could be obtained. Repeating the above steps can obtain asphalt balls continuously.
The diameter of the obtained asphalt ball is 0.4-0.8 mm.
Example 6
(1) According to the proportion of asphalt: naphthalene weight ratio of 1: 0.35, adding 150-mesh asphalt with a softening point of 230 ℃ and naphthalene into a stirring and heating kettle 3, and obtaining the molten modified asphalt under the conditions of 260 ℃ and a stirring rotating speed of 80 revolutions per minute;
(2) extruding the molten modified asphalt from an extrusion plate with an extrusion hole of 2.5mm at the temperature of 90 ℃ and the pressure of 70kg/cm 2;
(3) and (3) allowing the extruded molten modified asphalt to stay in the air for 25s, then allowing the molten modified asphalt to enter water, and allowing the molten modified asphalt to stay for 600s to obtain the asphalt balls.
When the prepared asphalt ball is 1/2 of the sum of the initial asphalt and the weight of the naphthalene in the stirring and heating kettle 3, under the condition of not stopping the operation, the weight ratio of the mixture of the initial asphalt and the weight of the naphthalene is 1: 0.35 of asphalt and naphthalene were added to the stirred tank heater 3 to supplement the extruded molten modified asphalt, so that the continuity of the entire operation could be achieved and continuous asphalt pellets could be obtained. Repeating the above steps can obtain asphalt balls continuously.
The diameter of the obtained asphalt ball is 1.8-2.4 mm.
Claims (2)
1. A continuous process for preparing asphalt balls is characterized by comprising the following steps:
(1) according to the proportion of asphalt: naphthalene weight ratio of 1: (0.2-0.5), adding the asphalt and the naphthalene into a stirring and heating kettle, and obtaining the molten modified asphalt under the conditions of 250-350 ℃ and the stirring speed of 50-300 r/min;
(2) melting modified asphalt at 80-200 deg.C and 10-80kg/cm2Extruding from 0.8-3mm extruding holes on the extruding plate under the pressure of (1);
(3) the extruded molten modified asphalt stays in the air for 1 to 30 seconds and then enters water, and then stays for 300 to 900 seconds to obtain an asphalt ball;
(4) when the prepared asphalt balls are 1/4-2/3 of the sum of the weight of the asphalt and the weight of the naphthalene in the stirring and heating kettle, under the condition of not stopping the operation, the weight ratio of the initial asphalt to the naphthalene is 1/5-1/3: (0.2-0.5) adding the asphalt and naphthalene into the stirred heating kettle to supplement the extruded molten modified asphalt, thus realizing the continuity of the whole operation and obtaining continuous asphalt balls;
(5) repeating the operations of the steps (1) to (4) to continuously obtain the asphalt balls.
2. The continuous process for preparing asphalt balls according to claim 1, wherein the asphalt is high-temperature asphalt with 10-250 meshes and a softening point of 180-290 ℃.
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| CN111960408B (en) * | 2020-09-04 | 2023-04-07 | 湖南大学 | Efficient preparation method of mesophase pitch carbon microspheres |
| CN113201223B (en) * | 2021-03-19 | 2023-08-25 | 麻阳万兴沥青混凝土有限公司 | Layered rolling type asphalt ball raw material treatment device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272533A (en) * | 2013-06-08 | 2013-09-04 | 中国科学院山西煤炭化学研究所 | Pitch sphere oxidative stabilization method |
| CN103695019A (en) * | 2013-12-09 | 2014-04-02 | 中国科学院山西煤炭化学研究所 | Low energy one-step method for preparing asphalt balls |
| CN104909365A (en) * | 2015-06-09 | 2015-09-16 | 中国科学院山西煤炭化学研究所 | Method for promoting asphalt sphere oxidation without melting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1154953A (en) * | 1966-11-21 | 1969-06-11 | Permanite Ltd | Method of Manufacturing Mastic Asphalt |
| US4931231A (en) * | 1985-04-22 | 1990-06-05 | American Colloid Company | Method for manufacturing discrete pellets of asphaltic material |
| US5259947A (en) * | 1990-12-21 | 1993-11-09 | Conoco Inc. | Solvated mesophase pitches |
| CN103289719B (en) * | 2013-06-08 | 2014-11-26 | 中国科学院山西煤炭化学研究所 | Process for preparing asphalt sphere |
| CN103756706B (en) * | 2014-01-16 | 2015-06-17 | 神华集团有限责任公司 | Modified asphalt and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272533A (en) * | 2013-06-08 | 2013-09-04 | 中国科学院山西煤炭化学研究所 | Pitch sphere oxidative stabilization method |
| CN103695019A (en) * | 2013-12-09 | 2014-04-02 | 中国科学院山西煤炭化学研究所 | Low energy one-step method for preparing asphalt balls |
| CN104909365A (en) * | 2015-06-09 | 2015-09-16 | 中国科学院山西煤炭化学研究所 | Method for promoting asphalt sphere oxidation without melting |
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