CN112662444A - Method for casting coal powder in dedusting ash by ultrasonic separation - Google Patents
Method for casting coal powder in dedusting ash by ultrasonic separation Download PDFInfo
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Abstract
The invention relates to the field of casting, in particular to a method for ultrasonically separating and casting coal dust in dedusting ash, which comprises the following steps: pouring the casting dedusting ash into a stirring pool, adding water and stirring uniformly, wherein the mass ratio of the casting dedusting ash to the water is 1 (2-3); adding ultrasonic sound generating devices at two ends of the stirring pool, and performing ultrasonic treatment for 18-20min at an ultrasonic frequency of 30-50 KHz; and (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1-1.5h, extracting an upper solid layer, and filtering and drying to obtain the coal powder. The method for ultrasonically separating and casting the coal dust in the dedusting ash adopts an ultrasonic treatment process, utilizes the cavitation effect of ultrasonic to separate the coal dust adsorbed on the surface of silicon dioxide particles, and separates the coal dust with lower density from the components such as silicon dioxide with higher density by standing, and the recovery rate of the coal dust is more than 70%. The strength of the bricks prepared by using the fly ash after coal dust separation is improved, and meanwhile, the separated coal dust can be used as heat energy, so that the energy utilization rate is improved.
Description
Technical Field
The invention relates to the field of casting, in particular to a method for casting coal dust in dedusting ash by ultrasonic separation.
Background
In recent years, industrial waste treatment has been gradually scaled up with the increasing awareness of environmental protection. As well as the foundry industry, foundry waste sand reclamation has been a necessary trend. The emission of dust removal ash can be generated in the casting production process, the dust generated by national casting is counted to be more than 30 ten thousand tons, effective treatment means are lacked for a long time, most of the dust is stacked or buried in the open air, but the dust is randomly stacked, so that a large amount of land resources are occupied, and the ecological environment is damaged. How to effectively utilize the casting dust so as to avoid adverse effects on the environment is a problem to be solved urgently. At present, some manufacturers add other materials into the dedusting ash to press the dedusting ash into bricks or other building materials, but the general strength is not high, and the sales volume is limited; the reason for the low strength is mainly that the content of coal dust in the fly ash is too high. By detecting that the heat value of each 1kg of waste ash reaches 5.91MJ-6.98MJ (one-steam casting fly ash), if the coal powder is separated out and put into use, the heat energy is greatly saved, and the treatment of the residual waste ash is relatively simple.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for ultrasonically separating coal dust in casting precipitator dust, which realizes the separation of the coal dust from the casting precipitator dust.
The invention adopts the following technical scheme:
a method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water and stirring uniformly, wherein the mass ratio of the casting dedusting ash to the water is 1 (2-3); (2) adding ultrasonic sound generating devices at two ends of the stirring pool, and performing ultrasonic treatment for 18-20min at an ultrasonic frequency of 30-50 KHz; (3) and (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1-1.5h, extracting an upper solid layer, and filtering and drying to obtain the coal powder.
Further, the casting dust removal ash consists of 30-45 wt% of coal powder, 35-50 wt% of silicon dioxide and 5-20 wt% of metal oxide.
Further, the power density of the ultrasonic wave is 0.7-1W/cm2。
Further, the stirring speed in step (1) is 500-900 rpm.
Further, stirring is carried out in the ultrasonic treatment process in the step (2), wherein the stirring speed is 500-900 rpm.
Further, extracting a lower solid layer from the mixture after standing in the step (3), filtering and drying to obtain silicon dioxide and insoluble salt.
Further, in the step (3), the drying temperature is 60-80 ℃, and the drying time is 40-60 min.
The method for ultrasonically separating and casting the coal dust in the dedusting ash adopts an ultrasonic treatment process, utilizes the cavitation effect of ultrasonic to separate the coal dust adsorbed on the surface of silicon dioxide particles, and separates the coal dust with lower density from the components such as silicon dioxide with higher density by standing, and the recovery rate of the coal dust is more than 70%. The strength of the brick prepared from the fly ash after coal dust separation is improved, and meanwhile, the separated coal dust is used as heat energy, so that the energy utilization rate is improved, and a large amount of heat is prevented from being wasted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of an apparatus for ultrasonically separating coal dust from casting precipitator dust according to the present invention;
in the figure: 1-a stirring pool, 2-a standing pool, 3-an ultrasonic sound generating device, 4-a stirring blade, 5-a first liquid outlet, 6-a first switch, 7-a liquid conveying pipe, 8-a second liquid outlet, 9-a second switch and 10-a pumping-out pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water and stirring uniformly, wherein the mass ratio of the casting dedusting ash to the water is 1 (2-3); (2) adding ultrasonic sound generating devices at two ends of the stirring pool, and performing ultrasonic treatment for 18-20min at an ultrasonic frequency of 30-50 KHz; (3) and (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1-1.5h, extracting an upper solid layer, and filtering and drying to obtain the coal powder.
Because the coal dust in the casting dust removal ash (with smaller particle size, generally more than 200 meshes) is adsorbed on SiO2The particles are generally not separated from each other by stirring. The cavitation effect of ultrasonic wave is needed to be utilized, and the action between tiny particles is utilized to lead the adsorbed coal dust and SiO2And (5) separating the particles.
Ultrasonic waves are mechanical waves, like sound waves, and are generated by periodic vibrations of mass points in a medium under the action of external forces. The waveform of the ultrasonic wave propagating in the medium depends on what kind of force the medium can withstand and how the ultrasonic wave is excited to the medium. Generally, there are three types, longitudinal wave mode, transverse wave mode, and surface wave mode. Ultrasonic waves are transmitted in the form of longitudinal waves in liquid, and alternating sound pressure of the ultrasonic waves periodically generates stretching and compression in the liquid. For weaker ultrasound, the bubbles (cavitation nuclei) are enlarged during the negative pressure phase of the sound pressure, and are reduced during the positive pressure phase. The size of the bubbles pulsates with the frequency of the sound wave. In the case of bubbles vibrating in a sound field, the surface area of the expansion phase bubbles is larger than that of the compression phase, so that the gas diffusing into the bubbles during expansion is larger than that diffusing out of the bubbles during compression, and the bubbles are enlarged during vibration. When the resonance radius is reached, the bubble is converted from steady state to transient cavitation, and then collapse occurs. The invention effectively utilizes the cavitation effect of ultrasonic waves to separate the coal dust adsorbed on the surface of the silicon dioxide.
Specifically, the casting dedusting ash consists of 30-45 wt% of coal powder, 35-50 wt% of silicon dioxide and 5-20 wt% of metal oxide. The metal oxide comprises aluminum oxide, ferric oxide, calcium oxide, magnesium oxide, potassium oxide, sodium oxide and titanium dioxide. More specifically, the casting dust is composed of 40-45 wt% of coal powder, 35-40 wt% of silicon dioxide, 8-10 wt% of aluminum oxide, 2-4 wt% of ferric oxide, 2-3 wt% of calcium oxide, 1-2 wt% of magnesium oxide, 0.5-1 wt% of potassium oxide, 1.5-2 wt% of sodium oxide and 0.1-0.5 wt% of titanium dioxide.
Specifically, the power density of the ultrasonic wave is 0.7-1W/cm2。
Specifically, the stirring speed in step (1) is 500-900 rpm.
Specifically, stirring is also carried out in the ultrasonic treatment process in the step (2), and the stirring speed is 500-900 rpm.
Specifically, the method further comprises the steps of extracting a lower solid layer from the mixture after standing in the step (3), filtering and drying to obtain silicon dioxide and insoluble salt.
Specifically, in the step (3), the drying temperature is 60-80 ℃, and the drying time is 40-60 min.
Specifically, in some embodiments of the present invention, as shown in fig. 1, the apparatus for implementing ultrasonic separation of coal dust in casting dust includes a stirring tank 1 and a standing tank 2, wherein ultrasonic sound generators 3 are disposed on two opposite side walls of the stirring tank 1, and a stirring blade 4 is further disposed in the stirring tank 1, and the stirring blade 4 is driven to rotate by an external motor (not shown in the figure) to implement stirring of the mixture. The stirring pond 1 is provided with first liquid outlet 5 on being close to the lateral wall of bottom, and the outside fixedly connected with first switch 6 and transfer line 7 of first liquid outlet 5, transfer line 7 extend to 2 bottoms in the pond of stewing, realize standing in the pond 2 of stewing with the mixture introduction after the ultrasonic agitation treatment. Preferably, the standing tank 2 is a transparent layering tank, and the standing layering effect can be seen by naked eyes. Set up second liquid outlet 8 in 2 bottoms in the pond of stewing, the outside fixedly connected with second switch 9 of second liquid outlet 8 and take out from pump 10, take out from pump 10 under the effect with the big component of lower floor density from the bottom extraction, extract the less buggy of upper strata density from the upper strata again, realize the separation of buggy and other component. The device simple structure effectively realizes the separation of buggy and other components in the casting dust removal ash behind the ultrasonic action, has good separation effect.
The method for ultrasonically separating and casting the coal dust in the fly ash according to the present invention is described in detail above, and will be further explained with reference to the specific embodiments.
Example 1
A method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water, and uniformly stirring at the stirring speed of 500rpm, wherein the mass ratio of the casting dedusting ash to the water is 1: 3; (2) adding ultrasonic sound generating devices at two ends of the stirring tank, and performing ultrasonic treatment while stirring for 18min, with ultrasonic frequency of 50KHz and power density of 0.8W/cm2(ii) a (3) And (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1h, extracting an upper solid layer, filtering and drying to obtain coal powder, extracting a lower solid layer, filtering and drying to obtain silicon dioxide and insoluble salt, wherein the drying temperature is 60 ℃, and the drying time is 50 min.
The casting dust removal ash in the embodiment comprises 42.60 wt% of coal powder, 37.31 wt% of silicon dioxide, 9.12 wt% of aluminum oxide, 3.40 wt% of ferric oxide, 2.38 wt% of calcium oxide, 1.72 wt% of magnesium oxide, 0.84 wt% of potassium oxide, 1.80 wt% of sodium oxide and 0.43 wt% of titanium dioxide.
Example 2
A method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water, and uniformly stirring at the stirring speed of 900rpm, wherein the mass ratio of the casting dedusting ash to the water is 1: 2; (2) adding ultrasonic sound generating devices at two ends of the stirring tank, and performing ultrasonic treatment while stirring for 18min, with ultrasonic frequency of 40KHz and power density of 0.7W/cm2(ii) a (3) And (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1h, extracting an upper solid layer, filtering and drying to obtain coal powder, extracting a lower solid layer, filtering and drying to obtain silicon dioxide and insoluble salt, wherein the drying temperature is 80 ℃, and the drying time is 40 min.
The casting dust removal ash in the embodiment comprises 44.80 wt% of coal powder, 36.25 wt% of silicon dioxide, 8.54 wt% of aluminum oxide, 2.94 wt% of ferric oxide, 2.24 wt% of calcium oxide, 1.54 wt% of magnesium oxide, 0.85 wt% of potassium oxide, 1.62 wt% of sodium oxide and 0.40 wt% of titanium dioxide.
Example 3
A method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water, and uniformly stirring at the stirring speed of 700rpm, wherein the mass ratio of the casting dedusting ash to the water is 1: 2; (2) adding ultrasonic sound generating devices at two ends of the stirring tank, and performing ultrasonic treatment while stirring for 20min, with ultrasonic frequency of 30KHz and power density of 1W/cm2(ii) a (3) And (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1.5h, extracting an upper solid layer, filtering and drying to obtain coal powder, extracting a lower solid layer, filtering and drying to obtain silicon dioxide and insoluble salt, wherein the drying temperature is 80 ℃, and the drying time is 60 min.
The composition of the cast fly ash in this example was the same as in example 1.
Example 4
A method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water, and uniformly stirring at the stirring speed of 800rpm, wherein the mass ratio of the casting dedusting ash to the water is 1: 2; (2) adding ultrasonic sound generating devices at two ends of the stirring tank, and performing ultrasonic treatment while stirring for 20min, with ultrasonic frequency of 50KHz and power density of 1W/cm2(ii) a (3) And (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1h, extracting an upper solid layer, filtering and drying to obtain coal powder, extracting a lower solid layer, filtering and drying to obtain silicon dioxide and insoluble salt, wherein the drying temperature is 70 ℃, and the drying time is 60 min.
The composition of the cast fly ash in this example was the same as in example 1.
Comparative example 1
A method for separating coal dust in casting dust includes the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water, and uniformly stirring at the stirring speed of 500rpm, wherein the mass ratio of the casting dedusting ash to the water is 1: 3; (2) and (2) quickly introducing the mixture stirred in the step (1) into a standing pool to stand for 1h, extracting an upper solid layer, filtering and drying to obtain coal powder, extracting a lower solid layer, filtering and drying to obtain silicon dioxide and insoluble salt, wherein the drying temperature is 60 ℃, and the drying time is 50 min.
The composition of the cast fly ash in this comparative example was identical to that of example 1.
Comparative example 2
A method for ultrasonically separating and casting coal powder in dedusting ash comprises the following steps: (1) pouring the casting dedusting ash into a stirring pool, adding water, and uniformly stirring at the stirring speed of 500rpm, wherein the mass ratio of the casting dedusting ash to the water is 1: 3; (2) adding ultrasonic sound generating devices at two ends of the stirring tank, and performing ultrasonic treatment while stirring for 10min, with ultrasonic frequency of 50KHz and power density of 0.8W/cm2(ii) a (3) And (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1h, extracting an upper solid layer, filtering and drying to obtain coal powder, extracting a lower solid layer, filtering and drying to obtain silicon dioxide and insoluble salt, wherein the drying temperature is 60 ℃, and the drying time is 50 min.
The composition of the cast fly ash in this comparative example was identical to that of example 1.
The upper solid layer extracted in examples 1-4 and comparative examples 1-2 was dried and then the content of the pulverized coal was measured by HJ761-2015 ignition reduction method, and the recovery rate of the pulverized coal was obtained by comparing with the amount of the pulverized coal contained in the casting dust. And meanwhile, making a brick by using the extracted lower solid layer as a raw material, and testing the compressive strength of the prepared brick. The results are shown in Table 1.
Table 1 results of performance testing
As can be seen from Table 1, the present invention effectively separates the pulverized coal adsorbed on the surface of the silica particles by using the cavitation effect of the ultrasonic waves, and the recovery rate of the pulverized coal reaches more than 70%. Meanwhile, when the casting dedusting ash after coal dust separation is used as a building material raw material, the strength of the building material is improved, the utilization rate and the sales volume of the casting dedusting ash are increased, and the effective recycling of solid wastes is effectively realized.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (7)
1. A method for ultrasonically separating and casting coal dust in dedusting ash is characterized by comprising the following steps:
(1) pouring the casting dedusting ash into a stirring pool, adding water and stirring uniformly, wherein the mass ratio of the casting dedusting ash to the water is 1 (2-3);
(2) adding ultrasonic sound generating devices at two ends of the stirring pool, and performing ultrasonic treatment for 18-20min at an ultrasonic frequency of 30-50 KHz;
(3) and (3) quickly introducing the mixture subjected to the ultrasonic treatment in the step (2) into a standing tank, standing for 1-1.5h, extracting an upper solid layer, and filtering and drying to obtain the coal powder.
2. The method for ultrasonically separating coal dust from casting dust according to claim 1, wherein the casting dust consists of 30-45 wt% coal dust, 35-50 wt% silicon dioxide and 5-20 wt% metal oxide.
3. The method for ultrasonically separating and casting the coal dust in the fly ash according to claim 1, wherein the power density of the ultrasonic wave is 0.7-1W/cm2。
4. The method for ultrasonically separating the coal dust in the casting dust according to claim 1, wherein the stirring speed in the step (1) is 500-900 rpm.
5. The method for ultrasonically separating the coal dust in the casting dust according to claim 1, wherein stirring is further performed during the ultrasonic treatment in the step (2), and the stirring speed is 500-900 rpm.
6. The method for ultrasonically separating the coal dust in the cast dust removal ash according to claim 1, further comprising the steps of extracting a lower solid layer from the mixture after standing in the step (3), filtering and drying to obtain silicon dioxide and insoluble salt.
7. The method for ultrasonically separating and casting the coal dust in the precipitator dust according to claim 1, wherein the drying temperature in the step (3) is 60-80 ℃, and the drying time is 40-60 min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114853010A (en) * | 2022-03-21 | 2022-08-05 | 柳晶科技集团股份有限公司 | Method for preparing activated carbon by using cast fly ash |
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