CN109701729B - Clean utilization production process for middlings - Google Patents
Clean utilization production process for middlings Download PDFInfo
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- CN109701729B CN109701729B CN201910033098.3A CN201910033098A CN109701729B CN 109701729 B CN109701729 B CN 109701729B CN 201910033098 A CN201910033098 A CN 201910033098A CN 109701729 B CN109701729 B CN 109701729B
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Abstract
The invention discloses a clean utilization production process of middlings, which has the technical scheme that: the method comprises the following steps: s1, primary processing of raw coal; s2, preliminarily removing the medium coal containing water and medium to obtain a qualified medium; s3, washing the medium-containing coal at the tail part of the medium removing sieve to obtain a dilute medium liquid: washing the medium-containing middlings medium removal sieve tail after preliminary medium removal in the step S2 to obtain water-containing middlings and dilute medium liquid, introducing the dilute medium liquid into a multilayer overflow standing water tank, pouring all solid and liquid in the single-layer standing water tank into a magnetic separator for separation after the solid content in the single-layer standing water tank reaches 1/2, introducing the liquid flowing through the multilayer overflow standing water tank into a centrifugal filter again, introducing the green solid matter in the centrifugal filter into the magnetic separator for separation, introducing the magnetic matter separated by the magnetic separator into a medium combining cylinder, and introducing the screened water of the non-magnetic matter into a medium gangue magnetic tail cylinder; s4, screening by a high-frequency screen; the invention has the advantage of improving the recovery and utilization rate of the medium in the medium coal de-mediating process.
Description
Technical Field
The invention relates to the technical field of coal washing, in particular to a clean utilization production process for middlings.
Background
Coal washing is an indispensable procedure for coal deep processing, coal directly mined from a mine is called raw coal, a plurality of impurities are mixed in the raw coal during mining, the quality of the coal is different, and the coal with small inherent ash content and the coal with large inherent ash content are mixed together. Coal washing is an industrial process for removing impurities in raw coal or classifying high-quality coal and low-quality coal. Products produced after the coal washing process are generally divided into gangue, middlings and lump clean coal, and how to remove impurities in the middlings has important significance in efficiently washing out middlings with high precision.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a clean utilization production process of middlings, which has the advantage of improving the recovery and utilization rate of media in the middling coal de-mediating process.
The technical purpose of the invention is realized by the following technical scheme: a clean utilization production process of middlings comprises the following steps:
s1, primary processing of raw coal: carrying out primary processing on raw coal to obtain water-containing medium-containing coal;
s2, preliminarily removing medium coal in the water-containing medium to obtain a qualified medium: allowing the water-containing medium-containing coal obtained in the step S1 to enter a medium removing sieve for medium removal to obtain medium-containing coal and a water-containing qualified medium, recovering the water-containing qualified medium to a medium combining cylinder, and conveying the medium in the medium combining cylinder to a three-product cyclone;
s3, washing the medium-containing coal at the tail part of the medium removing sieve to obtain a dilute medium liquid: washing the medium-containing medium coal medium removal sieve tail after preliminary medium removal in the step S2 to obtain water-containing medium coal and a dilute medium liquid, introducing the dilute medium liquid into a multilayer overflow standing water tank, after the solid content in a single-layer standing water tank reaches 1/2, pouring all solid and liquid in the single-layer standing water tank into a magnetic separator for separation, introducing the liquid flowing through the multilayer overflow standing water tank into a centrifugal filter, filtering out solid substances in the centrifugal filter and introducing the solid substances into the magnetic separator for separation, introducing magnetic substances separated by the magnetic separator into a medium combining cylinder, and introducing screened water of non-magnetic substances into a medium gangue magnetic tail cylinder;
s4, high-frequency screening: and step S3, enabling the screen underflow in the middle gangue magnetic tail cylinder to enter a high-frequency screen for screening, enabling the middlings in the screen underflow to flow out to obtain middlings, and enabling the liquid to flow out to the middle gangue magnetic tail cylinder through an overflow port.
According to the technical scheme, the middlings containing water are subjected to primary and secondary medium removal through the medium removing sieve, and then the middlings are collected, so that on one hand, the media in the middlings are removed, the cleanliness and the purity of the coal are improved, on the other hand, the media separated from the middlings are recycled to the three-product cyclone and are reused in the separation of raw coal, and the utilization rate of the media is improved; after the screened water after medium removal is finally screened by a high-frequency screen containing a swirler, the middlings particles are screened out, the output rate of middlings is improved, and the liquid overflowing from the swirler enters a middlings magnetic tail cylinder again for utilization. The whole process reflects the high efficiency and cleanness of coal production, and some liquid or medium generated in the process is recycled, so that the utilization rate is improved, the recovery rate of medium recovery is improved, and the influence on the liquid density in the medium combining cylinder caused by the backflow of dilute medium liquid in the magnetic separation process of the magnetic separator is avoided.
The invention is further configured to: when the medium removing sieve removes the medium in the step S3, the medium coal containing water becomes oversize material, and meanwhile, the qualified medium containing water enters the medium combining cylinder through the medium removing sieve;
and (4) enabling oversize-water-containing medium coal to enter the tail part of the medium removing sieve to be washed to obtain the water-containing medium coal and dilute medium liquid.
According to the technical scheme, through the steps, the middlings and the qualified media are separated by the medium removing sieve, the qualified media are recycled, the media contained in the middlings flow through the medium removing sieve along with water to obtain the dilute medium liquid, then magnetic separation is carried out, the media after magnetic separation are recycled, the utilization rate of the media is improved, the media in the middlings are separated, and the cleanliness and the purity of the middlings are improved.
The invention is further configured to: the raw coal preliminary processing in step S1 includes magnetic screening of the raw coal.
Through the technical scheme, the raw coal with fewer impurities can be obtained through magnetic screening, the purity and the cleanliness of the raw coal are improved, and the later-stage efficient processing of the raw coal is facilitated.
The invention is further configured to: and (8) sorting the coal with different particle sizes from the raw coal subjected to magnetic screening in the step S1 through a linear screen.
Through the technical scheme, the raw coal is sorted through the linear screen.
The invention is further configured to: and step S1, crushing the raw coal with the particle size larger than the set value in a crusher, and mixing the crushed raw coal with the particle size smaller than or equal to the set value.
Through the technical scheme, the raw coal with larger particle size is crushed and then enters the three-product cyclone, so that the requirement of entering the three-product cyclone is met.
The invention is further configured to: and (4) feeding the mixed raw coal in the step (S1) into a three-product cyclone, separating clean coal mixed with a coal washing medium, middlings mixed with the coal washing medium and gangue mixed with the coal washing medium from the raw coal, and feeding the obtained middlings mixed with the coal washing medium into a medium removing sieve for medium removal.
Through the technical scheme, clean coal, middlings and gangue are sorted out from raw coal and then are respectively processed, so that convenience and processing precision of processing are facilitated.
The invention is further configured to: the medium removing sieve in the step S2 comprises a banana-shaped linear vibrating sieve, wherein the banana-shaped linear vibrating sieve comprises an arc-shaped section and a linear section connected with the lowest point of the arc-shaped section.
The invention is further configured to: and (S2) obtaining qualified medium from the water-containing medium-containing coal in the arc section and the side of the straight section of the medium removing sieve close to the arc section.
Through above-mentioned technical scheme, the segmental arc through taking off the medium sieve screens down with qualified medium and water in the aqueous middlings, then collects both and recycles, and simultaneously, the middlings is detained on taking off the medium sieve, then vibrates to the straightway and keeps away from segmental arc one side and wash.
The invention is further configured to: and (5) flushing and medium removing the medium-containing coal at one side of the straight line section, which is far away from the arc section, to obtain dilute medium liquid in the step (S3).
Through the technical scheme, the medium in the water-containing middling coal is washed out through the steps, and the cleanliness and the purity of the middling coal are improved.
The invention is further configured to: the high-frequency screen in the step S4 comprises a high-frequency screen body and a cyclone arranged at the upper end of the high-frequency screen body, the screened water in the step S3 firstly enters the cyclone, and the middlings in the screened water enter the high-frequency screen body through underflow to be sorted;
and the liquid in the water under the sieve flows out through the overflow port and enters the middle gangue magnetic tail cylinder for recycling.
Through the technical scheme, part of water in the undersize water enters the middling magnetic tailing cylinder from the overflow port through the cyclone, and the middling coal particles in the middling coal magnetic tailing cylinder are repeatedly utilized and enter the high-frequency screen to be vibrated to achieve the screening purpose.
In conclusion, the invention has the following beneficial effects:
1. removing iron and other impurity elements in the raw coal by magnetic screening, and improving the cleanliness and purity of the raw coal so as to improve the cleanliness of the middling product;
2. the medium coal containing water and medium is subjected to primary medium removal and secondary medium removal through a medium removal sieve, so that on one hand, the medium in the medium coal is removed, the cleanness and the purity of the coal are improved, on the other hand, the medium separated from the medium coal is recycled to a three-product cyclone and is reused in the separation of raw coal, and the utilization rate of the medium is improved;
3. the high-frequency sieve with the cyclone is used for treating the screened water after medium removal, the middlings particles in the screened water fall on the high-frequency sieve body through the overflow port for screening, and the liquid flows to the middlings magnetic tail cylinder through the overflow port for recycling, so that the output rate of middlings is improved.
Drawings
FIG. 1 is a process flow diagram of a clean utilization production process of middlings.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that, as used in the following description, the terms "front," "rear," "left," "right," "upper," "lower," "bottom" and "top" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Examples
A clean utilization production process of middlings, as shown in figure 1, comprises the following steps:
and S1, performing primary processing on the raw coal to obtain the water-containing middling coal.
The specific operation is as follows:
firstly, performing magnetic screening on raw coal, removing iron impurities and other impurities in the raw coal, then feeding the raw coal subjected to magnetic screening into a linear screen, and sorting the raw coal with different particle sizes through the linear screen, wherein the sorting is determined according to the subsequent processing technology, in the embodiment, in order to enable the particle size of the raw coal to meet the requirement of a three-product cyclone, the raw coal is sorted into the particle sizes of more than 50mm and less than or equal to 50mm by the linear screen, the raw coal with the particle size of more than 50mm is fed into a crusher to be crushed, and the crushed raw coal is mixed with the raw coal with the particle size of less than or equal to 50 mm;
then, feeding the mixed raw coal into a three-product cyclone, and separating out the raw coal into water-containing clean coal mixed with a coal washing medium, water-containing middlings mixed with the coal washing medium and water-containing gangue mixed with the coal washing medium;
s2, carrying out primary medium removal on the water-containing medium coal containing the coal washing medium obtained in the step S1 to obtain a qualified medium, and specifically carrying out the following operations:
the aqueous middlings containing the coal washing media obtained in the step S1 enter a medium removing sieve for medium removal, the medium removing sieve comprises a banana-type linear vibrating sieve, the banana-type linear vibrating sieve comprises an arc-shaped section and a straight line section connected with the lowest point of the arc-shaped section, the aqueous medium-containing middlings firstly fall on the arc-shaped section of the medium removing sieve for preliminary screening, at the moment, the middlings are retained on the sieve surface of the medium removing sieve to serve as oversize products, qualified media and water in the middlings enter a medium combining cylinder through the medium removing sieve, the media in the medium combining cylinder are conveyed to a three-product cyclone, the qualified media are recycled, and meanwhile, a part of the media in the middlings are washed away, so that the accuracy of the middlings is improved;
s3, washing the medium-containing medium coal medium removal sieve tail after preliminary medium removal in the step S2 to obtain medium coal containing water and dilute medium liquid, introducing the dilute medium liquid into a multilayer overflow standing water tank, pouring all solid and liquid in the single-layer standing water tank into a magnetic separator for separation after the solid content in the single-layer standing water tank reaches 1/2, introducing the liquid flowing through the multilayer overflow standing water tank into a centrifugal filter, filtering out solid substances in the centrifugal filter and introducing the solid substances into the magnetic separator for separation, introducing magnetic substances separated by the magnetic separator into a medium combining barrel, and introducing screened water of the non-magnetic substances into a medium gangue magnetic tail barrel;
s4, enabling screen drainage entering the middle gangue magnetic tail cylinder in the step S3 to enter a high-frequency screen for screening, wherein the high-frequency screen comprises a high-frequency screen body and a cyclone arranged above the high-frequency screen body. The screen underflow in the step S3 firstly enters the cyclone, the middlings particles in the screen underflow enters the high-frequency screen body for sorting, and the liquid in the screen underflow flows out through the overflow port and enters the middlings magnetic tail cylinder for recycling.
In the embodiment, firstly, the raw coal is initially processed through magnetic screening, iron and other impurities are screened and taken out, the cleanliness and the purity of the raw coal are improved, then the raw coal with the particle size larger than 50mm is separated through a linear screen and crushed, and then the raw coal is mixed with the raw coal with the particle size smaller than 50mm and enters a three-product cyclone for separation to obtain clean coal, middlings and gangue; the middlings are collected after the aqueous medium-containing middlings are subjected to primary medium removal and secondary medium removal through a medium removal sieve, so that on one hand, the medium in the middlings is removed to improve the cleanliness and purity of the coal, and on the other hand, the medium separated from the middlings is recycled to a three-product cyclone and reused in the separation of raw coal to improve the utilization rate of the medium; after the screened water after medium removal is finally screened by a high-frequency screen containing a swirler, the middlings particles are screened out, the output rate of middlings is improved, and the liquid overflowing from the swirler enters a middlings magnetic tail cylinder again for utilization. The whole process reflects the high efficiency and cleanness of coal production, and some liquid or medium generated in the process is recycled, so that the utilization rate is improved.
And the middlings containing media after the preliminary medium removal are washed to obtain aqueous middlings and dilute medium liquid, the dilute medium liquid is introduced into a multilayer overflow standing water tank for filtering, the structure of the multilayer overflow standing water tank is that water tanks are sequentially arranged from top to bottom, an overflow pipe is arranged at the top of an upper water tank and is connected with a lower water tank, a standing water purification system formed by a plurality of water tanks is adopted, the multilayer overflow standing water tank is full of overflow from top to bottom, the flow rate is controlled in the overflow process, the water impact is reduced, the standing precipitation effect of other positions can be realized in the water flowing process, water discharged by the water tank at the bottommost layer is introduced into a centrifugal filter for more careful filtering, so that the primary filtering of the multilayer overflow standing water tank effectively reduces the filtering pressure of the centrifugal filter, the filtering efficiency and effect of the centrifugal filter are improved, and the water after centrifugal filtering can be continuously circulated to a middle gangue magnetic tail cylinder for reuse, or directly introducing into a sewage treatment system for harmless treatment.
And the basin directly pours the solid-liquid in the basin into the magnet separator together after stewing more solid and selects separately, and the solid that filters off in the centrifugal filter also pours into the magnet separator and selects separately to the effectual liquid volume that gets into in the magnet separator that has reduced, thereby the effectual interference that reduces liquid impact promotes the effect of magnetic separation, and also avoids blockking up in the magnet separator that the back liquid influences inside liquid density through the recovery tube at once in closing a medium section of thick bamboo.
Because the solid content during magnetic separation is more, the magnetic substance that contains in the solid is convenient for adsorb the conglomeration to be convenient for divide and sieve out, promote and divide the sieve precision, promote the recovery effect.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A clean utilization production process of middlings is characterized in that: the method comprises the following steps:
s1, primary processing of raw coal: carrying out primary processing on raw coal to obtain water-containing medium-containing coal;
s2, preliminarily removing medium coal in the water-containing medium to obtain a qualified medium: allowing the water-containing medium-containing coal obtained in the step S1 to enter a medium removing sieve for medium removal to obtain medium-containing coal and a water-containing qualified medium, recovering the water-containing qualified medium to a medium combining cylinder, and conveying the medium in the medium combining cylinder to a three-product cyclone;
s3, washing the medium-containing coal at the tail part of the medium removing sieve to obtain a dilute medium liquid: washing the medium-containing medium coal medium removal sieve tail after preliminary medium removal in the step S2 to obtain water-containing medium coal and a dilute medium liquid, introducing the dilute medium liquid into a multilayer overflow standing water tank, after the solid content in a single-layer standing water tank reaches 1/2, pouring all solid and liquid in the single-layer standing water tank into a magnetic separator for separation, introducing the liquid flowing through the multilayer overflow standing water tank into a centrifugal filter, filtering out solid substances in the centrifugal filter and introducing the solid substances into the magnetic separator for separation, introducing magnetic substances separated by the magnetic separator into a medium combining cylinder, and introducing screened water of non-magnetic substances into a medium gangue magnetic tail cylinder;
s4, high-frequency screening: and step S3, enabling the screen underflow in the middle gangue magnetic tail cylinder to enter a high-frequency screen for screening, enabling the middlings in the screen underflow to flow out to obtain middlings, and enabling the liquid to flow out to the middle gangue magnetic tail cylinder through an overflow port.
2. The clean utilization production process of middlings as claimed in claim 1, which is characterized in that: when the medium removing sieve removes the medium in the step S3, the medium coal containing water becomes oversize material, and meanwhile, the qualified medium containing water enters the medium combining cylinder through the medium removing sieve;
and (4) enabling oversize-water-containing medium coal to enter the tail part of the medium removing sieve to be washed to obtain the water-containing medium coal and dilute medium liquid.
3. The clean utilization production process of middlings as claimed in claim 1, which is characterized in that: the raw coal preliminary processing in step S1 includes magnetic screening of the raw coal.
4. The clean utilization production process of middlings as claimed in claim 3, which is characterized in that: and (8) sorting the coal with different particle sizes from the raw coal subjected to magnetic screening in the step S1 through a linear screen.
5. The clean utilization production process of middlings as claimed in claim 4, which is characterized in that: and step S1, crushing the raw coal with the particle size larger than the set value in a crusher, and mixing the crushed raw coal with the particle size smaller than or equal to the set value.
6. The clean utilization production process of middlings as claimed in claim 5, which is characterized in that: and (4) feeding the mixed raw coal in the step (S1) into a three-product cyclone, separating clean coal mixed with a coal washing medium, middlings mixed with the coal washing medium and gangue mixed with the coal washing medium from the raw coal, and feeding the obtained middlings mixed with the coal washing medium into a medium removing sieve for medium removal.
7. The clean utilization production process of middlings as claimed in claim 1, which is characterized in that: the medium removing sieve in the step S2 comprises a banana-shaped linear vibrating sieve, wherein the banana-shaped linear vibrating sieve comprises an arc-shaped section and a linear section connected with the lowest point of the arc-shaped section.
8. The clean utilization production process of middlings as claimed in claim 7, which is characterized in that: and (S2) obtaining qualified medium from the water-containing medium-containing coal in the arc section and the side of the straight section of the medium removing sieve close to the arc section.
9. The clean utilization production process of middlings as claimed in claim 8, which is characterized in that: and (5) flushing and medium removing the medium-containing coal at one side of the straight line section, which is far away from the arc section, to obtain dilute medium liquid in the step (S3).
10. The clean utilization production process of middlings as claimed in claim 1, which is characterized in that: the high-frequency screen in the step S4 comprises a high-frequency screen body and a cyclone arranged at the upper end of the high-frequency screen body, the screened water in the step S3 firstly enters the cyclone, and the middlings in the screened water enter the high-frequency screen body through underflow to be sorted;
and the liquid in the water under the sieve flows out through the overflow port and enters the middle gangue magnetic tail cylinder for recycling.
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2019
- 2019-01-14 CN CN201910033098.3A patent/CN109701729B/en not_active Expired - Fee Related
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