CN112138856B - All-magnetic separation process for gangue-combined media in easily-argillized power coal - Google Patents
All-magnetic separation process for gangue-combined media in easily-argillized power coal Download PDFInfo
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- CN112138856B CN112138856B CN202010811311.1A CN202010811311A CN112138856B CN 112138856 B CN112138856 B CN 112138856B CN 202010811311 A CN202010811311 A CN 202010811311A CN 112138856 B CN112138856 B CN 112138856B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
Abstract
The invention provides a process for completely magnetically separating gangue in easily-argillized power coal, which comprises the following steps of: medium coal and gangue suspension liquid separated by heavy medium is separated into oversize materials, qualified media and dilute media through medium removal and screening; the qualified medium and the dilute medium are merged and enter a medium gangue magnetic tail barrel; feeding the medium gangue magnetic tail bucket into a strong magnetic disk type magnetic separator for roughing, and dividing the medium gangue magnetic tail bucket into concentrate and tailings; the magnetic separation tailings enter a coal slime bucket, and the magnetic separation concentrate enters a drum type magnetic separator for fine separation into concentrate and tailings; returning the magnetic concentrate to a qualified medium barrel, and separating the magnetic tailings into underflow and overflow through a grading cyclone; the underflow of the grading cyclone is fed into coarse coal slime separation equipment or is mixed with gangue products, and the overflow of the grading cyclone enters a thickener. The invention utilizes twice magnetic separation to discharge all the high-ash fine mud in the medium with qualified medium of the medium gangue, avoids the repeated circulation of the high-ash fine mud to aggravate gangue argillization and deteriorate the medium recovery and slime water treatment effects, and provides an effective means for fully recovering the medium and reducing the slime water treatment pressure.
Description
Technical Field
The invention belongs to the field of dense-medium coal separation, relates to a medium recovery process in a dense-medium coal separation process, and particularly relates to a process for completely magnetically separating gangue in easily-argillized power coal.
Background
The dense medium coal separation technology is the first choice method for processing raw coal in a coal preparation plant. However, for coal preparation plants with high clay mineral content in power coal or raw coal, secondary coal slime is easily generated in the heavy medium separation process, and adverse effects are brought to medium recovery and coal slime water treatment.
The medium circulation link existing in the heavy medium coal separation is a main cause of secondary coal slime, and research documents show that the secondary coal slime is greatly increased by adopting a pressure feeding two-product heavy medium cyclone, and the secondary coal slime is increased by 7%. The secondary coal slime is repeatedly circulated through qualified media in the heavy medium process, so that the argillization phenomenon is further aggravated. A large number of researches show that the change rule of the yield of the primary coal secondary coal slime along with the argillization time is fast firstly and slow secondly, namely, the secondary coal slime shows a rule that the primary coal slime is fast increased firstly and is slowly increased after 15-20min along with the continuous argillization time, and the secondary coal slime is mainly generated in qualified medium of middlings and gangue. Therefore, easily-argillized materials should be removed as soon as possible in the slime water treatment process.
Around the research idea, various power coal preparation plants adopt a plurality of measures to create a good slime water treatment environment. Some western power coal preparation plants adopt the flocculant to be added in a front-mounted manner, and the flocculant is added into a coal slurry barrel under a desliming screen, so that favorable solution conditions are created, and the argillization degree is reduced. Some coal preparation plants adopt a newly-added magnetic separator to specially process the dilute medium in the gangue section. After the medium is recovered by the magnetic separator, the gangue mud of the tailings is directly discharged into the fixed sieve, the arc sieve and the high-frequency sieve for dehydration and discharge, so that the circulation of high-ash fine mud in the gangue dilute medium is avoided. And in some power coal preparation plants, the gangue medium removal sieve plate is replaced by a sieve plate with the aperture of 1.5mm or 2mm to a sieve plate with the aperture of 0.5mm, so that gangue mud with the granularity of 1.5-0.5mm can be discharged out of a coal slime water system in time.
Based on the method, the treatment efficiency and the process of the slime water are continuously improved in recent years, in the actual production process, a large amount of slime still exists in qualified medium of middling coal and gangue and circulates in a heavy medium system, so that a large amount of high-ash fine mud cannot be discharged out of the system in time, the treatment pressure of the slime water is increased due to the circulation of the high-ash fine mud on one hand, the viscosity of circulating water and magnetic separation feed materials is increased due to the high-ash fine mud on the other hand, and the product is taken away and the loss medium in the magnetic separation tailings is increased. Therefore, the treatment effect of the slime water is further improved, and the circulation of high-ash fine mud in the medium-gangue qualified medium needs to be broken, and the high-ash fine mud is timely discharged out of the separation system.
Disclosure of Invention
Aiming at the problems that high-ash fine mud mainly circulates in medium-gangue qualified media and cannot be discharged in time, and the treatment effect and the medium recovery effect of slime water are deteriorated, the invention provides a process for fully mixing the medium-gangue qualified media and dilute media and then jointly removing the high-ash fine mud in the medium-gangue qualified media through magnetic separation and grading, and provides a process for fully magnetic separation of the medium-gangue in easily-argillized power coal.
The method mainly comprises the following steps:
a process for completely magnetically separating gangue medium in easily-argillized power coal comprises the following steps:
step 1: screening the middlings and gangue suspension liquid separated by the dense medium into oversize materials, qualified media and dilute media through an arc screen and a medium removal screen;
step 2: combining the qualified medium and the dilute medium under the screen and entering a medium gangue magnetic tail barrel;
and step 3: feeding the medium gangue magnetic tail bucket into a strong magnetic disk type magnetic separator for roughing, and dividing the medium gangue magnetic tail bucket into concentrate and tailings;
and 4, step 4: the magnetic separation tailings enter a coal slime bucket, and the magnetic separation concentrate and circulating water are fed into a drum-type magnetic separator for fine separation and are divided into concentrate and tailings;
and 5: the concentrate of the drum-type magnetic separator returns to the qualified medium barrel;
step 6: the tail ore of the drum-type magnetic separator enters a grading cyclone and is divided into overflow and underflow;
and 7: and the overflow of the grading cyclone enters a thickener, and the underflow enters coarse coal slime separation equipment or is mixed with gangue products.
Preferably, the raw coal is easy-to-argillization power coal, namely raw coal W500>1 ratio of sludge formation>10.1％。
Preferably, the medium gangue magnetic tail bucket is a stirring bucket.
Preferably, the magnetic field intensity of the rough separation strong magnetic disk type magnetic separator is 2000-2500GS, and water spraying type auxiliary discharging is adopted.
Preferably, the magnetic field intensity of the concentration drum-type magnetic separator is 1200-1800 GS.
Has the advantages that: the invention discharges the high-ash fine mud part in the qualified gangue medium in the easily-argillized power coal to the heavy medium separation system in time through all magnetic separation, adopts a magnetic separation process of firstly roughing by a strong magnetic field to realize full recovery of the medium and then finely separating and desliming by a weak magnetic field, ensures the effects of medium and desliming, reduces the yield of secondary coal slime and medium loss, and is easy to implement.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention
FIG. 2 is a flow chart of a coal preparation process according to an embodiment of the method of the present invention.
Reference numbers in the figures: a-a curved screen; b-medium removing screening; c, a middle gangue magnetic tail barrel; d-a strong magnetic disk type magnetic separator; e-weak magnetic drum type magnetic separator; f-coal slime bucket; g-qualified medium barrel; an H-staged cyclone; i-a thickener.
Detailed Description
In order to make the technical method of the invention easily understood, the technical scheme of the invention is described by using specific examples with reference to the attached drawings. It should be noted that the embodiments described herein are only some embodiments of the present invention, and not all implementations of the present invention, and the purpose of the embodiments is only to provide the examiner and the public with a more intuitive and clear understanding of the present invention, and not to limit the technical solutions of the present invention. All other embodiments, as well as other simple substitutions and various changes to the technical solutions of the present invention, which can be made by those skilled in the art without inventive work, are within the scope of the present invention without departing from the spirit of the present invention.
The invention comprises a medium mixing link for qualified medium, a rough concentration magnetic separation desliming link and a product treatment link.
FIG. 1 is a schematic flow diagram of the method of the present invention:
separating raw coal into clean coal, middlings and gangue products after heavy medium separation; the middlings and the gangue are respectively divided into oversize materials, qualified media and dilute media after passing through an arc screen A and a medium removing screen B;
the middlings, qualified gangue media and dilute media are merged and enter a middling magnetic tailing bucket C;
the material in the medium gangue magnetic tail barrel C is sent to a strong magnetic disk type magnetic separator D through a feeding pump and is divided into concentrate and tailings;
the tailings of the strong magnetic disc type magnetic separator D enter a coal slime bucket F, and the concentrate of the strong magnetic disc type magnetic separator D is mixed with circulating water and then fed into a weak magnetic drum type magnetic separator E to be divided into concentrate and tailings;
e, enabling concentrate of the weak magnetic drum type magnetic separator to enter a qualified medium barrel G, feeding tailings into a grading cyclone H, and dividing the tailings into overflow and underflow;
and the classifying cyclone H overflows into a thickener I, and the underflow enters coarse coal slime separation equipment or is mixed with gangue products.
FIG. 2 is a flow chart of a coal preparation process according to an embodiment of the present invention:
the slack coal system of the coal preparation plant is a 10.0Mt/a power coal preparation plant, three products, namely 2 products, 1200/850 products with the diameter, namely a dense medium cyclone, are adopted to separate and separate clean coal, medium coal and gangue products, and the three products respectively enter respective sieve curves and linear vibration medium removal sieves.
The undersize of the middlings and the gangue sieve arc and the front section of the linear medium removing sieve are qualified medium sections, the rear section of the linear medium removing sieve is added with water spraying medium removing sections, and the undersize is a dilute medium section.
The qualified gangue media in the original system are mixed and enter a return qualified medium barrel, the dilute media enter 3 HMDS1219 type roller magnetic separators, the magnetic concentrate returns to the qualified medium barrel, and the tailings enter a medium gangue coal mud barrel.
The proportion of the coal slime in the medium gangue qualified medium mixed under the condition accounts for more than 50 percent of the solid content, and the granularity composition is shown in table 1:
particle size composition of nonmagnetic material in waste rock qualified medium in Table 1
According to the results, the ash content of the coal slurry with the size of-0.5 mm in the medium gangue qualified medium is up to more than 55%, particularly the content of-0.25 mm in the medium gangue qualified medium is up to more than 1/4, and the ash content is more than 60%, which shows that the medium gangue qualified medium contains nearly half of high-ash fine mud, and the circulation of the part of the material in the qualified medium can further increase the content of the high-ash fine mud in the coal slurry water, thereby deteriorating the treatment effect of the coal slurry water. The above process is improved according to the scheme of the invention.
After improvement, the qualified medium of the middlings and the gangue and the dilute medium are mixed and enter a stirring barrel with the diameter of 3.0m, and the mixture is fully mixed and then is conveyed to 2 disk magnetic separators with the diameter of 1.5m by 6 m by pumps. Mixing concentrate of the disc magnetic separator and circulating water until the concentration is about 30%, then feeding the mixture into 3 HMDS1219 type drum-type magnetic separators for fine separation, feeding the concentrate of the drum-type magnetic separators into a qualified medium barrel, and feeding tailings mixed with tailings of the disc magnetic separators into a grading cyclone group for grading; the underflow of the grading cyclone is dehydrated by a high-frequency sieve and then mixed with gangue products, and the overflow is fed into a thickener.
The proportion of coal slime in the qualified gangue medium in the scheme, which accounts for the solid content, is reduced to below 30%, and the granularity composition is shown in table 2:
table 2: non-magnetic substance granularity composition in medium gangue qualified medium
The results show that the ash content of the coal slime with the size of-0.5 mm in the medium gangue qualified medium is reduced to be less than 40 percent, and the content of-0.125 mm in the medium gangue qualified medium is reduced to 13.61 percent. The process adopting the scheme can effectively remove the high-ash fine mud from the qualified medium of the medium gangue in time, and the content of the high-ash fine mud is reduced by more than 50 percent compared with the content of the high-ash fine mud in the qualified medium of the medium gangue in the existing process. The method provides a good premise for ensuring the treatment effect of the slime water, and actual production shows that the consumption of the slime water medicament is reduced by more than 10%, the discharge period of a filter press is shortened by more than 10%, and the overall dielectric consumption is reduced by more than 10%.
Claims (1)
1. The process for completely magnetically separating the gangue medium in the easily-argillized power coal is characterized by comprising the following steps of:
step 1: the middlings sorted by the heavy media are sequentially separated into oversize materials, qualified media and dilute media through a middlings sieve bend and a middlings medium removal sieve, and the waste rock suspension sorted by the heavy media is sequentially separated into oversize materials, qualified media and dilute media through a waste rock sieve bend and a waste rock medium removal sieve;
step 2: combining the undersize qualified medium and the dilute medium obtained by screening the middlings in the step 1 and the undersize qualified medium and the dilute medium obtained by screening the gangue and entering a middling gangue magnetic tail barrel;
and step 3: feeding the medium gangue magnetic tail bucket into a strong magnetic disk type magnetic separator for roughing, and dividing the medium gangue magnetic tail bucket into concentrate and tailings;
and 4, step 4: magnetic separation tailings enter a coal slime bucket, magnetic separation concentrate and circulating water are fed into a drum type magnetic separator for fine separation, and the concentrate and the tailings are separated;
and 5: returning the concentrate of the drum-type magnetic separator to the qualified medium barrel;
step 6: the tail ore of the drum-type magnetic separator enters a grading cyclone and is divided into overflow and underflow;
and 7: the overflow of the grading cyclone enters a thickener, and the underflow enters coarse coal slime separation equipment or is mixed with gangue products;
the raw coal is easy-to-argillization power coal, raw coal W500>1 ratio of sludge formation>10.1%；
The middle gangue magnetic tail barrel is a stirring barrel;
the magnetic field intensity of the rough concentration strong magnetic disc type magnetic separator is 2000-;
the magnetic field intensity of the concentration drum-type magnetic separator is 1200-1800 GS.
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