CN102211054B - Process for sorting coarse coal slime by utilizing heavy medium liquid-solid fluidized bed - Google Patents
Process for sorting coarse coal slime by utilizing heavy medium liquid-solid fluidized bed Download PDFInfo
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Abstract
The invention provides a process for sorting coarse coal slime by utilizing a heavy medium liquid-solid fluidized bed. The process provided by the invention comprises the following steps: pouring a dilute medium of screenings screened by a clean coal medium-removing and dewatering screen and a part of the medium in a current divider box into a coarse coal slime sorting feed barrel; introducing a medium in a heavy medium system into the feedings of a liquid-solid fluidized bed coarse coal slime sorter; after the feedings are sorted by the liquid-solid fluidized bed coarse coal slime sorter, adding a magnetic separator recovery medium into overflows and underflows, wherein the added heavy medium can be used for weakening the influence of granularity to interference settlement, and strengthening the effect for sorting materials according to density, so that the sorting precision of the liquid-solid fluidized bed coarse coal slime sorter within a wide grain range can be improved, and the recovery ratio of coarse clean coals is greatly improved on the premise of ensuring the ash content of the coarse clean coals; simultaneously, the grain processing range of the liquid-solid fluidized bed coarse coal slime sorter is expanded; and the processing capacity of reselection is improved, and the flotation cost is reduced.
Description
Technical field
The present invention relates to a kind of process for sorting coarse coal slime by utilizing heavy medium liquid-solid fluidized bed, be particularly useful in the coal wet split technique the 3-0.25mm coarse slime grey desulfurization falls.
Background technology
The technique that the most coal preparation technique adopts not classification gravity concentration+separation of coarse slime+flotation to combine, coarse slime refers generally to the coal grain of 2mm-0.25mm according to GB GB/T7186-1998, be positioned at gravity treatment and flotation sorting granularity boundary (being generally 0.5mm) near, this part coal slime generally adopts Slime dense medium cyclone, spiral and the sorting of liquid-solid fluid bed coarse slime size machine, when adopting the Slime dense medium cyclone fine coal, affected greatly by the working condition of major diameter cyclone, separating effect is poor, and the equipment feed pressure is large, and equipment attrition is serious.During the spiral fine coal, separating density is high and non-adjustable, sub-elects cleans ash high.The liquid-solid fluid bed coarse slime size machine relies on separating density low and can control to adjust, and generally not strict to the pan feeding concentration requirement, the little advantage of power consumption becomes at present effectively one of equipment of fine coal.
The liquid-solid fluid bed coarse slime size machine is that a kind of ascending current that utilizes makes the coal slime fluidization, relies on coal slime self to form the bed with certain density as medium, and coal slime realizes sorting according to certain hindered falling speed.Hindered falling speed is relevant with granularity, the density characteristics of particle, and when narrow grade sorting, hindered falling speed is subjected to particle size influences less, and bed density is stable, and material is realized sorting by density, and sharpness of separation is high.When wide grade sorting, hindered falling speed is subjected to particle size influences large, and bed density is unstable, and material can not be in strict accordance with density separation, and sharpness of separation reduces.General liquid-solid fluidisation fluidized bed rough coal sorting process in the production reality be heavily be situated between in the sorting process the cleaned coal magnetic tailing or enter the liquid-solid fluid bed coarse slime size machine with the desliming screen screenings after through the classifying cyclone classification, in this technique, the sorting upper limit of separator is to be determined by the sieve aperture of the sculping screen in the gravity separation technology and desliming screen, lower limit of separation is determined by classifying cyclone, because the classification efficiency of classifying cyclone is low, has determined that the sorting particle size range of this technique is wider.In wide grade assorting room; the high density fine grained can enter the pollution load of overflow cleaned coal; the low-density coarse granule can enter underflow becomes tail coal, causes clean coal recovery low, and cleans ash is high; sharpness of separation is low; separating effect is poor, simultaneously, because the liquid-solid fluid bed separation machine is poor at wide grade separating effect; cause the treating capacity of gravity treatment to be restricted, the cost of flotation is large.
Technology contents
Technical problem: the objective of the invention is to overcome the weak point in the prior art, provide that a kind of cleans ash is low when the coarse slime of sorting 3mm-0.25mm, sharpness of separation is high, the process for sorting coarse coal slime by utilizing heavy medium liquid-solid fluidized bed of good separation effect.
Technical scheme: process for sorting coarse coal slime by utilizing heavy medium liquid-solid fluidized bed of the present invention: comprise raw coal is carried out desliming or not desliming, medium after the desliming in the raw coal of raw coal or not desliming and the medium bucket enters three products and heavily is situated between and carries out sorting in the cyclone, the cleaned coal that sub-elects, middle coal and spoil carry out respectively the de-mediated dehydration, wherein cleaned coal enters the cleaned coal sieve bend and carries out in advance de-mediated, mixture enters cleaned coal de-mediated dewatering screen de-mediated dehydration on the sieve after the de-mediated in advance, the screenings medium enters in the current divider box to be shunted, the cleaned coal of cleaned coal de-mediated dewatering screen oversize is discharged after entering the dehydration of cleaned coal dehydration equipment, and the qualified medium of cleaned coal de-mediated dewatering screen screenings and a part of medium I in the current divider box enter in the lump closes the bucket that is situated between;
Rare medium of described cleaned coal de-mediated dewatering screen screenings and another part medium II in the current divider box enter in the lump separation of coarse slime and enter charging basket; Coal Jie mixture that separation of coarse slime enters charging basket enters and carries out classification in the classifying cyclone;
Thin material of the overflow that classified cyclone classification goes out enters the magnetic separator magnetic separation, and the concentrate after the magnetic separator magnetic separation enters and closes the bucket that is situated between, and the mine tailing after the magnetic separation enters the floatation equipment flotation;
Thick material of the underflow that classified cyclone classification goes out enters the sorting of liquid-solid fluid bed coarse slime size machine, the overflow that the liquid-solid fluid bed coarse slime size machine sub-elects enters the magnetic separation of cleaned coal magnetic separator, magnetic concentrate enters and closes the bucket that is situated between, magnetic tailing dewaters through cleaned coal Slime sizing ﹠ dewatering equipment, cleaned coal after the dehydration is discharged, and the cleaned coal black water enters the floatation equipment flotation;
The underflow that the liquid-solid fluid bed coarse slime size machine sub-elects enters the magnetic separation of middle coal magnetic separator, magnetic concentrate enters and closes the bucket that is situated between, coal Slime sizing ﹠ dewatering equipment dehydration in the magnetic tailing warp, the middle coal after the dehydration is discharged, and middle coal black water enters concentrated filtering equipment and concentrates press filtration.
Beneficial effect: rare medium of cleaned coal de-mediated dewatering screen screenings and the part medium in the current divider box are entered separation of coarse slime in the lump enter charging basket, by in the pan feeding of liquid-solid fluid bed coarse slime size machine, introducing the medium in heavy Jie system, behind liquid-solid fluid bed separation, corresponding overflow and underflow at the liquid-solid fluid bed coarse slime size machine increases the magnetic separation recovering medium, because the dense media that adds weakens granularity to the impact of hindered falling, strengthen material and press the density separation effect, reduced the coarse grained mispairing of high density fine grained and low-density, can improve the sharpness of separation of liquid-solid fluid bed coarse slime size machine in wide grade scope, under the prerequisite that guarantees thick cleans ash, greatly improved the rate of recovery of thick cleaned coal.The processing particle size range of also having extended the liquid-solid fluid bed coarse slime size machine simultaneously when adopting the front pre-desliming of choosing, can increase the sieve aperture of desliming screen, improve heavily the be situated between treating capacity of cyclone of desliming efficient and three products, when adopting before the choosing not desliming, can increase the sieve seam of sculping screen, reduce its consumption that is situated between; The liquid-solid fluid bed coarse slime size machine improves fine grain separating effect, can reduce effective sorting granularity upper limit of flotation sorting, reduces to enter the slime content of flotation, reduces the flotation cost.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
Implement one, when granularity in the raw coal less than 0.5mm, when content is lower than 20%, need not raw coal 1 is carried out desliming, its sorting process step is as follows:
A. the medium in the raw coal of not desliming and the medium bucket 22 enters in the lump three products and heavily is situated between and carries out sorting in the cyclone 3, select respectively cleaned coal, middle coal and spoil, the middle coal that sub-elects enters middle coal de-mediated dehydration equipment 4, and the spoil of sorting enters spoil de-mediated dehydration equipment 7;
B. the three products cleaned coal that cyclone 3 sub-elects that heavily is situated between enters in advance de-mediated of cleaned coal sieve bend 5, and mixture enters cleaned coal de-mediated dewatering screen 7 de-mediated dehydration on the sieve of sieve bend 5, and the screenings medium enters shunting in the current divider box 8;
C. the oversize cleaned coal of cleaned coal de-mediated dewatering screen 7 is discharged through 9 dehydrations of cleaned coal dehydration equipment,. a part of medium I under the screenings qualified medium of cleaned coal de-mediated dewatering screen 7 and the current divider box 8 enters closes in the bucket 22 that is situated between, and the screenings qualified medium of cleaned coal de-mediated dewatering screen 7 and another part medium II under the current divider box 8 enter separation of coarse slime and enter in the charging basket 10;
D. separation of coarse slime enters coal Jie mixtures in the charging basket 10 and is transported to through pumps and carries out classification in the classifying cyclone 11;
F. the fine grained that goes out of classifying cyclone 11 Grading Overflows enters magnetic separator 15 magnetic separation, and the concentrate that magneticly elects enters and closes the bucket 22 that is situated between, and the mine tailing that magneticly elects enters floatation equipment 21 flotation;
G. the fine grained that goes out of classifying cyclone 11 Grading Overflows enters after 12 sortings of liquid-solid fluid bed coarse slime size machine, under the hindered falling effect, low-density particles rises becomes overflow, enter magnetic separation in the cleaned coal magnetic separator 14, the magnetic concentrate of cleaned coal magnetic separator 14 flows back to and closes in the bucket 22 that is situated between, magnetic tailing is discharged cleaned coal 20 after entering 17 dehydrations of cleaned coal Slime sizing ﹠ dewatering equipment, and the cleaned coal black water after the dehydration enters flotation in the floatation equipment 21;
H. the fine grained in classifying cyclone 11 classification underflows enters after 12 sortings of liquid-solid fluid bed coarse slime size machine, under the hindered falling effect, the low-density particles sedimentation becomes underflow, enter magnetic separation in the coal magnetic separator 13, the tailing stream of coal magnetic separator 13 magnetic separation is got back to and is closed the bucket 22 that is situated between in the warp, after magnetic tailing entered middle coal Slime sizing ﹠ dewatering equipment 16 dehydrations, coal 18 in the discharge, and the middle coal black water after the dehydration enters in the concentrated filtering equipment 21 and concentrates press filtration.
Implement two, when granularity in the raw coal less than 0.5mm, content greater than 20% the time, need carry out desliming to raw coal 1.First will raw coal 1 introduce in the desliming screen 2 and carry out desliming, the oversize raw coal after the desliming enters the tertiary industry cyclone 3 that heavily is situated between and carries out sorting, and the screenings black water after the desliming enters separation of coarse slime and enters in the charging basket 10; Follow-up technique is identical with enforcement one, omits.
Claims (1)
1. dense media liquid-solid fluid bed coarse slime size technique, comprise raw coal (1) is carried out desliming or not desliming, when granularity in the raw coal less than 0.5mm, when content is lower than 20%, need not raw coal (1) is carried out desliming, when granularity in the raw coal less than 0.5mm, content greater than 20% the time, need carry out desliming to raw coal (1); Medium after the desliming in the raw coal of raw coal or not desliming and the medium bucket (22) enters in the lump three products and heavily is situated between and carries out sorting in the cyclone (3), the cleaned coal that sub-elects, middle coal and spoil carry out respectively the de-mediated dehydration, wherein cleaned coal enters cleaned coal sieve bend (5) and carries out in advance de-mediated, mixture enters cleaned coal de-mediated dewatering screen (7) de-mediated dehydration on the sieve after the de-mediated in advance, the screenings medium enters shunting in the current divider box (8), the cleaned coal of cleaned coal de-mediated dewatering screen (7) oversize is discharged after entering cleaned coal dehydration equipment (9) dehydration, and the qualified medium of cleaned coal de-mediated dewatering screen (7) screenings and a part of medium I in the current divider box (8) enter in the lump closes the bucket (22) that is situated between; It is characterized in that:
Rare medium of described cleaned coal de-mediated dewatering screen (7) screenings and another part medium II in the current divider box (8) enter in the lump separation of coarse slime and enter charging basket (10);
Coal Jie mixture that separation of coarse slime enters charging basket (10) enters in the classifying cyclone (11) and carries out classification; Thin material of overflow that classified cyclone (11) classification goes out enters magnetic separator (15) magnetic separation, and the concentrate after magnetic separator (15) magnetic separation enters and closes the bucket (22) that is situated between, and the mine tailing after the magnetic separation enters floatation equipment (21) flotation;
Thick material of underflow that classified cyclone (11) classification goes out enters liquid-solid fluid bed coarse slime size machine (12) sorting, the overflow that liquid-solid fluid bed coarse slime size machine (12) sub-elects enters cleaned coal magnetic separator (14) magnetic separation, magnetic concentrate enters and closes the bucket (22) that is situated between, magnetic tailing dewaters through cleaned coal Slime sizing ﹠ dewatering equipment (17), cleaned coal after the dehydration is discharged, and the cleaned coal black water enters floatation equipment (21) flotation;
The underflow that liquid-solid fluid bed coarse slime size machine (12) sub-elects enters middle coal magnetic separator (13) magnetic separation, magnetic concentrate enters and closes the bucket (22) that is situated between, coal Slime sizing ﹠ dewatering equipment (16) dehydration in the magnetic tailing warp, middle coal after the dehydration is discharged, and middle coal black water enters concentrated press filtration (19) equipment and concentrates press filtration.
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