CN103143432B - Efficient crushing and three-section type screening method of coking coal gravity middings - Google Patents
Efficient crushing and three-section type screening method of coking coal gravity middings Download PDFInfo
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Abstract
An efficient crushing and three-section type screening method of coking coal gravity middings belongs to coal crushing, dissociating and screening processes. Gravity middings in a coking coal preparation plant are taken as a raw material to be crushed through rolling to the fraction being below 6 mm or 3 mm; a desliming screen is used to deslime a material with the fraction being 1 mm, a material with the fraction being 6 to 1 mm or 3 to 1 mm enters into a three-product dense medium cyclone, and clean coal, middings and gangues are respectively obtained after two sections are subjected to medium drainage; the material with the fraction being 1 mm is mixed with tailings in a clean coal magnetic separator, fine coal slimes with the fraction being 0.25 mm are deslimed by a classifying cyclone; coarse coal slimes with the fractions being 1 to 0.25 mm enter into a teetered bed separator for screening, light products are dewatered by a sieve bend and a coal slime centrifuge to obtain coarse clean coal, and heavy products are dewatered by a screen bowl centrifuge to obtain tailings; the fine coal slimes with the fractions being 0.25 mm enter into a flotation machine for flotation, and foamed clean coal and the tailings are sequentially subjected to concentration and pressure filtration dewatering to obtain flotation clean coal and the tailing product; and after the gravity middings are crushed through rolling, the product returns to a mixing barrel. The method has the advantages that the graded screening is carried out on the preselected coal slimes with coarse fraction and fine fraction, and the equipment screening precision is improved.
Description
Technical field
The present invention relates to a kind of coal crushing sorting process that dissociates, relate in particular to efficiency crushing and the syllogic method for separating of coal in a kind of coking coal gravity treatment.
Background technology
Coal resources in China reserves are abundant, and coal is complete, but coking coal resource lacks relatively, account for 27.6%.Wherein rich coal, coking coal and three kinds of coking coals of lean coal account for respectively 3.75%, 6.71% and 4.17% of coal total resources.At present; become scarce resource as the indispensable coking coal of coking industry and rich coal resource; its exploitation and processing and utilization have been subject to the protection of national policy or energy strategy; due to many reasons; in existing coal for coking, the recovery process of coal is lower for the organic efficiency of scarce resource, needs rationally coal for coking sorting recovery process efficiently badly.
Summary of the invention
The object of the invention is to provide efficiency crushing and the syllogic method for separating of coal in a kind of coking coal gravity treatment, solve the low problem of the existing rare coal for coking rate of recovery.
The object of the present invention is achieved like this, by the following technical solutions: taking coal in Oversized Coking Coal Cleaning Plant gravity treatment as raw material, adopt the broken method of dissociating, select front desliming, thick middle three sections of sortings of fine fraction, carry out according to following steps:
(1) utilize tramp iron separator to remove in gravity treatment after the ironware foreign material in coal, enter rolling disintegrator 1, rolling disintegrator 1 material size <50mm, discharging-material size <6mm;
(2) utilize rolling disintegrator 1 centering coal to carry out fragmentation, the <6mm grade material after fragmentation enters desliming screen, and desliming screen need add Sprayer Circulation water, when quantity of circulating water is not enough, with clear water as a supplement;
(3) utilize desliming screen wet method that sieve aperture is 1mm to remove the coal slime of <1mm in pan feeding, 6 ~ 1mm grade oversize enters mixing tank;
(4) in mixing tank, 6 ~ 1mm grade desliming screen oversize and rolling disintegrator 2 return to broken material mix after, beat to three products heavy medium cyclone and carry out sorting with pump, three products heavy medium cyclone is two-part isodensity heavy medium cyclone, one section is carried out the sorting of the eddy flow field of force, and two sections to carry out strong eddy flow selected;
(5) mixture of the mixed material in mixing tank and qualified medium is under the rotational flow sorting effect of three products heavy medium cyclone, light product enters head coal sculpingscreen, intermediate product enters middle coal sculping screen, heavy product enters Coal Stone Separation, head coal sculpingscreen, middle coal sculping screen and Coal Stone Separation need add Sprayer Circulation water, when quantity of circulating water is not enough, with clear water as a supplement;
(6) one section of head coal sculpingscreen is deviate from dense medium, deviates from rare medium for two sections, and oversize becomes dense medium head coal product; Utilize cleaned coal magnetic separator to carry out magnetic separation to rare medium, magnetic concentrate and one section of dense medium of deviating from together enter qualified medium bucket;
(7) in, one section of coal sculping screen is deviate from dense medium, deviates from rare medium for two sections, and oversize enters rolling disintegrator 2; One section of dense medium of deviating from of middle coal sculping screen enters qualified medium bucket, and two sections of rare media of deviating from enter middle cash magnetic separator;
(8) one section of Coal Stone Separation is deviate from dense medium, deviates from rare medium for two sections, and oversize becomes spoil product; One section of dense medium of deviating from of Coal Stone Separation enters qualified medium bucket, two sections of rare media of deviating from of two sections of rare media of deviating from and middle coal sculping screen together enter middle cash magnetic separator, in utilization, cash magnetic separator carries out magnetic separation to rare medium, magnetic concentrate enters qualified medium bucket, the qualified medium of qualified medium bucket is beaten to three products heavy medium cyclone as separating medium with pump, regulates the Media density of qualified medium bucket by the method for adding medium or adding clear water;
(9), under the roller crushing effect of rolling disintegrator 2, middle coal sculping screen oversize is crushed into fritter, returns to mixing tank;
(10) after desliming screen screenings mixes in coal slime bucket with cleaned coal magnetic tailing, beat to classifying cyclone group and carry out classification with pump, the overflow of classifying cyclone group enters mixing cirtern, and underflow enters hindered bed separator; The granularity of described overflow is <0.25mm grade fine coal slurry; Described underflow granularity is 1 ~ 0.25mm grade coarse slime;
(11) under the sorting of hindered bed separator, light product enters cleaned coal sieve bend, and heavy product enters screen bowl centrifuge, and hindered bed separator needs recirculated water/clear water as top water, in the time of water shortage in circulating water pool, with clear water as a supplement;
(12) use cleaned coal sieve bend to carry out primary dewatering to the light product of hindered bed separator, oversize enters cleaned coal centrifuge, and screenings enters mixing cirtern;
(13) use cleaned coal centrifuge to carry out second dehydration to cleaned coal sieve bend oversize, its product is thick cleaned coal, and centrifugate enters mixing cirtern together with cleaned coal sieve bend screenings;
(14) use screen bowl centrifuge to dewater to the heavy product of hindered bed separator, its product is tail coal, and filtrate enters tail coal thickener;
(15) overflow of classifying cyclone group and clean coal pressur filter return to filtrate, cleaned coal sieve bend screenings and cleaned coal centrifuge centrifugate and in mixing cirtern, size mixing after pretreatment, enter flotation device sorting;
(16) under flotation device sorting, flotation device foam cleaned coal enters clean coal pressur filter, and tail coal enters tail coal thickener;
(17) use clean coal pressur filter to dewater to flotation device cleaned coal, after dehydration, product is floatation clean coal product, and filtrate is returned to mixing cirtern;
(18) in, cash magnetic tailing, flotation device tail coal and screen bowl centrifuge centrifugate together enter tail coal thickener, and thickener overflow enters circulating water pool, and underflow enters tail coal filter press;
(19) use tail coal filter press to dewater to tail coal thickener underflow, filter press product is tail coal product, and filtrate enters circulating water pool.
Beneficial effect: owing to having adopted such scheme, adopted twice fragmentation-slightly middle fine fraction to carry out respectively dense medium sorting, disturb bed sorting and three sections of sorting process methods of flotation to coal in rare coking coal gravity treatment, effectively realized " substep release, recovery step by step ".Coal in gravity treatment is crushed to <6mm grade, lump coal and mineral matter intergrowth are dissociated, 6 ~ 1mm grade raw coal adopts the three products heavy medium cyclone of technology maturation, and two-part isodensity heavy medium cyclone carries out sorting, has improved coarsely graded sharpness of separation; <1mm grade coal slime adopts after classifying cyclone component level, 1 ~ 0.25mm grade coarse slime adopts hindered bed separator sorting, <0.25mm grade fine coal slurry adopts flotation device sorting, in three products heavy medium cyclone, product of coal adopts rolling disintegrator to carry out second-time breakage, coal in coal and mineral matter intergrowth in coarse grain are further dissociated, greatly improved sharpness of separation and the rate of recovery of thick fine slime.
Advantage: in gravity treatment, coal is after fragmentation is dissociated, adopt dense medium sorting, disturb bed sorting and three sections of sorting process of flotation, thick, fine fraction coal slime classification and sorting that preliminary election is deviate from, improve the sharpness of separation of equipment, and reclaim as much as possible rare coking coal resources, increase economy, society and ecological benefits.
Brief description of the drawings
Fig. 1 is process chart of the invention process.
Detailed description of the invention
Embodiment 1: in Fig. 1, in rare coking coal gravity treatment, coal is by near tramp iron separator rubber belt conveyor head, remove ironware foreign material, enter rolling disintegrator 1, breakdown products enters the wet method desliming screen that sieve aperture is 1mm, after wet method desliming screen oversize mixes with rolling disintegrator 2 returns, beat to three products heavy medium cyclone with pump, light product enters head coal sculpingscreen, one section of dense medium of deviating from enters qualified medium bucket, two sections of rare media of deviating from enter cleaned coal magnetic separator, magnetic concentrate enters qualified medium bucket, mine tailing enters coal slime bucket, oversize is dense medium head coal product, the intermediate product of three products heavy medium cyclone enters middle coal sculping screen, one section of dense medium of deviating from enters qualified medium bucket, and two sections of rare media of deviating from enter middle cash magnetic separator, and magnetic concentrate enters qualified medium bucket, mine tailing enters tail coal thickener, and oversize enters rolling disintegrator 2, the heavy product of three products heavy medium cyclone enters Coal Stone Separation, one section of dense medium of deviating from enters qualified medium bucket, and two sections of rare media of deviating from enter middle cash magnetic separator, and magnetic concentrate enters qualified medium bucket, mine tailing enters tail coal thickener, and oversize is spoil product, after desliming screen screenings mixes with cleaned coal magnetic separator mine tailing in coal slime bucket, beat to classifying cyclone group with pump, overflow enters mixing cirtern, underflow enters hindered bed separator, the light product of hindered bed separator enters cleaned coal sieve bend, cleaned coal sieve bend oversize enters cleaned coal centrifuge, and cleaned coal centrifuge product is thick head coal product, and centrifugate and cleaned coal sieve bend screenings are mixed into mixing cirtern, the heavy product of hindered bed separator enters screen bowl centrifuge, and centrifuge product is tail coal product, and centrifugate enters tail coal thickener, the overflow of classifying cyclone group and clean coal pressur filter return to filtrate, cleaned coal sieve bend screenings and cleaned coal centrifuge centrifugate and are mixed into mixing cirtern, after the pretreatment of sizing mixing, enter flotation device, flotation device froth pulp enters clean coal pressur filter, filter press product is floatation clean coal product, and filtrate is returned to mixing cirtern, flotation device tail coal enters tail coal thickener, and the overflow of tail coal thickener enters circulating water pool, and tail coal thickener underflow enters tail coal filter press, and tail coal filter press filtrate enters circulating water pool, and tail coal filter press product is tail coal product.
In desliming and de-mediated process, need to add Sprayer Circulation water, hindered bed separator needs recirculated water/clear water as top water, in the time of water shortage in circulating water pool, with clear water as a supplement.Dense medium and magnetic concentrate that cleaned coal, middle coal and spoil are deviate from enter qualified medium bucket, cause when Media density changes, and can adjust by the method for adding medium or adding clear water.
Claims (1)
1. the efficiency crushing of coal and a syllogic method for separating in coking coal gravity treatment, is characterized in that, taking coal in Oversized Coking Coal Cleaning Plant gravity treatment as raw material, adopts the broken method of dissociating, select front desliming, thick middle three sections of sortings of fine fraction, carries out according to following steps:
(1) utilize tramp iron separator to remove in gravity treatment after the ironware foreign material in coal, enter rolling disintegrator 1, rolling disintegrator 1 material size <50mm, discharging-material size <6mm;
(2) utilize rolling disintegrator 1 centering coal to carry out fragmentation, the <6mm grade material after fragmentation enters desliming screen, and desliming screen need add Sprayer Circulation water, when quantity of circulating water is not enough, with clear water as a supplement;
(3) utilize desliming screen wet method that sieve aperture is 1mm to remove the coal slime of <1mm in pan feeding, 6 ~ 1mm grade oversize enters mixing tank;
(4) in mixing tank, 6 ~ 1mm grade desliming screen oversize and rolling disintegrator 2 return to broken material mix after, beat to three products heavy medium cyclone and carry out sorting with pump, three products heavy medium cyclone is two-part isodensity heavy medium cyclone, one section is carried out the sorting of the eddy flow field of force, and two sections to carry out strong eddy flow selected;
(5) mixture of the mixed material in mixing tank and qualified medium is under the rotational flow sorting effect of three products heavy medium cyclone, light product enters head coal sculpingscreen, intermediate product enters middle coal sculping screen, heavy product enters Coal Stone Separation, head coal sculpingscreen, middle coal sculping screen and Coal Stone Separation need add Sprayer Circulation water, when quantity of circulating water is not enough, with clear water as a supplement;
(6) one section of head coal sculpingscreen is deviate from dense medium, deviates from rare medium for two sections, and oversize becomes dense medium head coal product; Utilize cleaned coal magnetic separator to carry out magnetic separation to rare medium, magnetic concentrate and one section of dense medium of deviating from together enter qualified medium bucket;
(7) in, one section of coal sculping screen is deviate from dense medium, deviates from rare medium for two sections, and oversize enters rolling disintegrator 2; One section of dense medium of deviating from of middle coal sculping screen enters qualified medium bucket, and two sections of rare media of deviating from enter middle cash magnetic separator;
(8) one section of Coal Stone Separation is deviate from dense medium, deviates from rare medium for two sections, and oversize becomes spoil product; One section of dense medium of deviating from of Coal Stone Separation enters qualified medium bucket, two sections of rare media of deviating from of two sections of rare media of deviating from and middle coal sculping screen together enter middle cash magnetic separator, in utilization, cash magnetic separator carries out magnetic separation to rare medium, magnetic concentrate enters qualified medium bucket, the qualified medium of qualified medium bucket is beaten to three products heavy medium cyclone as separating medium with pump, regulates the Media density of qualified medium bucket by the method for adding medium or adding clear water;
(9), under the roller crushing effect of rolling disintegrator 2, middle coal sculping screen oversize is crushed into fritter, returns to mixing tank;
(10) after desliming screen screenings mixes in coal slime bucket with cleaned coal magnetic tailing, beat to classifying cyclone group and carry out classification with pump, the overflow of classifying cyclone group enters mixing cirtern, and underflow enters hindered bed separator; The granularity of described overflow is <0.25mm grade fine coal slurry; Described underflow granularity is 1 ~ 0.25mm grade coarse slime;
(11) under the sorting of hindered bed separator, light product enters cleaned coal sieve bend, and heavy product enters screen bowl centrifuge, and hindered bed separator needs recirculated water/clear water as top water, in the time of water shortage in circulating water pool, with clear water as a supplement;
(12) use cleaned coal sieve bend to carry out primary dewatering to the light product of hindered bed separator, oversize enters cleaned coal centrifuge, and screenings enters mixing cirtern;
(13) use cleaned coal centrifuge to carry out second dehydration to cleaned coal sieve bend oversize, its product is thick cleaned coal, and centrifugate enters mixing cirtern together with cleaned coal sieve bend screenings;
(14) use screen bowl centrifuge to dewater to the heavy product of hindered bed separator, its product is tail coal, and filtrate enters tail coal thickener;
(15) overflow of classifying cyclone group and clean coal pressur filter return to filtrate, cleaned coal sieve bend screenings and cleaned coal centrifuge centrifugate and in mixing cirtern, size mixing after pretreatment, enter flotation device sorting;
(16) under flotation device sorting, flotation device foam cleaned coal enters clean coal pressur filter, and tail coal enters tail coal thickener;
(17) use clean coal pressur filter to dewater to flotation device cleaned coal, after dehydration, product is floatation clean coal product, and filtrate is returned to mixing cirtern;
(18) in, cash magnetic tailing, flotation device tail coal and screen bowl centrifuge centrifugate together enter tail coal thickener, and thickener overflow enters circulating water pool, and underflow enters tail coal filter press;
(19) use tail coal filter press to dewater to tail coal thickener underflow, filter press product is tail coal product, and filtrate enters circulating water pool.
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