CN103143432A - 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
The 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 objective 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: in the Oversized Coking Coal Cleaning Plant gravity treatment coal as raw material, adopt broken dissociate, select front desliming, thick in the method for three sections 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 or＜3mm;
(2) utilize rolling disintegrator 1 centering coal to carry out fragmentation, after fragmentation＜6mm or＜3mm grade material enters desliming screen, desliming screen need add Sprayer Circulation water, when quantity of circulating water is not enough, with clear water as a supplement;
(3) utilize sieve aperture to remove in pan feeding＜coal slime of 1mm for the desliming screen wet method of 1mm, 6 ~ 1mm or 3 ~ 1mm grade oversize enter mixing tank;
(4) in mixing tank, 6 ~ 1mm or 3 ~ 1mm grade desliming screen oversize and rolling disintegrator 2 return to broken material mix after, beat to three products heavy medium cyclone with pump and carry out sorting, three products heavy medium cyclone is two-part isodensity heavy medium cyclone, one section is carried out eddy flow field of force sorting, and two sections to carry out strong eddy flow selected;
(5) mixture of coal 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, oversize Jie's head coal product that becomes to attach most importance to; Utilize the cleaned coal magnetic separator to carry out magnetic separation to rare medium, magnetic concentrate and one section dense medium of deviating from together enter the 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 dense medium of deviating from of middle coal sculping screen enters the qualified medium bucket, and two sections 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 the spoil product; One section dense medium of deviating from of Coal Stone Separation enters the qualified medium bucket, two sections rare media of deviating from of two sections rare media of deviating from and middle coal sculping screen together enter middle cash magnetic separator, in utilization, the cash magnetic separator carries out magnetic separation to rare medium, magnetic concentrate enters the 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 the desliming screen screenings mixes in the coal slime bucket with the cleaned coal magnetic tailing, beat to the classifying cyclone group with pump and carry out classification, 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 the cleaned coal sieve bend, and heavy product enters screen bowl centrifuge, and hindered bed separator needs recirculated water/clear water as top water, when the water shortage in circulating water pool, with clear water as a supplement;
(12) use the cleaned coal sieve bend to carry out primary dewatering to the light product of hindered bed separator, oversize enters the cleaned coal centrifuge, and screenings enters mixing cirtern;
(13) use the 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 that the heavy product of hindered bed separator is dewatered, its product is tail coal, and filtrate enters the 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 size mixing in mixing cirtern after pretreatment, enter the flotation device sorting;
(16) under the flotation device sorting, flotation device foam cleaned coal enters clean coal pressur filter, and tail coal enters the tail coal thickener;
(17) use clean coal pressur filter that the flotation device cleaned coal is dewatered, after dehydration, product is the 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 the tail coal thickener, and the thickener overflow enters circulating water pool, and underflow enters the tail coal filter press;
(19) use the tail coal filter press that the tail coal thickener underflow is dewatered, the filter press product is the tail coal product, and filtrate enters circulating water pool.
Beneficial effect: owing to having adopted such scheme, to coal in rare coking coal gravity treatment adopted in twice fragmentation-thick fine fraction heavily be situated between respectively sorting, disturb bed sorting and three sections sorting process methods of flotation, effectively realized " substep discharges, reclaims step by step ".Coal in gravity treatment is crushed to＜6mm or＜the 3mm grade, lump coal and mineral matter intergrowth are dissociated, 6 ~ 1mm or 3 ~ 1mm grade raw coal adopt the three products heavy medium cyclone of technology maturation, and namely two-part isodensity heavy medium cyclone carries out sorting, has improved coarsely graded sharpness of separation; After＜1mm grade coal slime adopts classifying cyclone component level, 1 ~ 0.25mm grade coarse slime adopts the hindered bed separator sorting,＜0.25mm grade fine coal slurry adopts the flotation device sorting, in three products heavy medium cyclone, product of coal adopts rolling disintegrator to carry out second-time breakage, make that in coarse grain, the coal in coal and mineral matter intergrowth further dissociate, 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 the sorting that heavily is situated between, disturb bed sorting and three sections sorting process of flotation, thick, fine fraction coal slime classification and sorting that preliminary election is deviate from, improved the sharpness of separation of equipment, and reclaim as much as possible rare coking coal resources, increase economy, society and ecological benefits.
Description of drawings
Fig. 1 is process chart of the invention process.
The specific embodiment
embodiment 1: in Fig. 1, in rare coking coal gravity treatment, coal is by near the tramp iron separator rubber belt conveyor head, remove the ironware foreign material, enter rolling disintegrator 1, breakdown products enters the wet method desliming screen that sieve aperture is 1mm, wet method desliming screen oversize is with after rolling disintegrator 2 returns mix, beat to three products heavy medium cyclone with pump, light product enters head coal sculpingscreen, one section dense medium of deviating from enters the qualified medium bucket, two sections rare media of deviating from enter the cleaned coal magnetic separator, magnetic concentrate enters the qualified medium bucket, mine tailing enters the coal slime bucket, oversize Jie's head coal product of namely attaching most importance to, the intermediate product of three products heavy medium cyclone enters middle coal sculping screen, one section dense medium of deviating from enters the qualified medium bucket, and two sections rare media of deviating from enter middle cash magnetic separator, and magnetic concentrate enters the qualified medium bucket, mine tailing enters the tail coal thickener, and oversize enters rolling disintegrator 2, the heavy product of three products heavy medium cyclone enters Coal Stone Separation, one section dense medium of deviating from enters the qualified medium bucket, and two sections rare media of deviating from enter middle cash magnetic separator, and magnetic concentrate enters the qualified medium bucket, mine tailing enters the tail coal thickener, and oversize is the spoil product, the desliming screen screenings in the coal slime bucket with after cleaned coal magnetic separator mine tailing mixes, beat to the classifying cyclone group with pump, overflow enters mixing cirtern, underflow enters hindered bed separator, the light product of hindered bed separator enters the cleaned coal sieve bend, cleaned coal sieve bend oversize enters the 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 the centrifuge product is the tail coal product, and centrifugate enters the 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, enter flotation device after the pretreatment of sizing mixing, the flotation device froth pulp enters clean coal pressur filter, the filter press product is the floatation clean coal product, and filtrate is returned to mixing cirtern, the flotation device tail coal enters the tail coal thickener, and the overflow of tail coal thickener enters circulating water pool, and the tail coal thickener underflow enters the tail coal filter press, and tail coal filter press filtrate enters circulating water pool, and tail coal filter press product is the tail coal product.
Need add Sprayer Circulation water in desliming and de-mediated process, hindered bed separator needs recirculated water/clear water as top water, when the 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 the qualified medium bucket, cause when Media density changes, and can adjust by the method for adding medium or adding clear water.
Claims (1)
1. efficiency crushing and the syllogic method for separating of coal in a coking coal gravity treatment, is characterized in that, in the Oversized Coking Coal Cleaning Plant gravity treatment coal as raw material, adopt broken dissociate, select front desliming, thick in the method for three sections 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 or＜3mm;
(2) utilize rolling disintegrator 1 centering coal to carry out fragmentation, after fragmentation＜6mm or＜3mm grade material enters desliming screen, desliming screen need add Sprayer Circulation water, when quantity of circulating water is not enough, with clear water as a supplement;
(3) utilize sieve aperture to remove in pan feeding＜coal slime of 1mm for the desliming screen wet method of 1mm, 6 ~ 1mm or 3 ~ 1mm grade oversize enter mixing tank;
(4) in mixing tank, 6 ~ 1mm or 3 ~ 1mm grade desliming screen oversize and rolling disintegrator 2 return to broken material mix after, beat to three products heavy medium cyclone with pump and carry out sorting, three products heavy medium cyclone is two-part isodensity heavy medium cyclone, one section is carried out eddy flow field of force sorting, and two sections to carry out strong eddy flow selected;
(5) mixture of coal 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, oversize Jie's head coal product that becomes to attach most importance to; Utilize the cleaned coal magnetic separator to carry out magnetic separation to rare medium, magnetic concentrate and one section dense medium of deviating from together enter the 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 dense medium of deviating from of middle coal sculping screen enters the qualified medium bucket, and two sections 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 the spoil product; One section dense medium of deviating from of Coal Stone Separation enters the qualified medium bucket, two sections rare media of deviating from of two sections rare media of deviating from and middle coal sculping screen together enter middle cash magnetic separator, in utilization, the cash magnetic separator carries out magnetic separation to rare medium, magnetic concentrate enters the 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 the desliming screen screenings mixes in the coal slime bucket with the cleaned coal magnetic tailing, beat to the classifying cyclone group with pump and carry out classification, 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 the cleaned coal sieve bend, and heavy product enters screen bowl centrifuge, and hindered bed separator needs recirculated water/clear water as top water, when the water shortage in circulating water pool, with clear water as a supplement;
(12) use the cleaned coal sieve bend to carry out primary dewatering to the light product of hindered bed separator, oversize enters the cleaned coal centrifuge, and screenings enters mixing cirtern;
(13) use the 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 that the heavy product of hindered bed separator is dewatered, its product is tail coal, and filtrate enters the 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 size mixing in mixing cirtern after pretreatment, enter the flotation device sorting;
(16) under the flotation device sorting, flotation device foam cleaned coal enters clean coal pressur filter, and tail coal enters the tail coal thickener;
(17) use clean coal pressur filter that the flotation device cleaned coal is dewatered, after dehydration, product is the 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 the tail coal thickener, and the thickener overflow enters circulating water pool, and underflow enters the tail coal filter press;
(19) use the tail coal filter press that the tail coal thickener underflow is dewatered, the filter press product is the tail coal product, and filtrate enters circulating water pool.
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