CN106669953B - Clay-removing type liquid-solid fluidized bed coarse slime separation overflow clean coal grading device - Google Patents

Clay-removing type liquid-solid fluidized bed coarse slime separation overflow clean coal grading device Download PDF

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CN106669953B
CN106669953B CN201710024070.4A CN201710024070A CN106669953B CN 106669953 B CN106669953 B CN 106669953B CN 201710024070 A CN201710024070 A CN 201710024070A CN 106669953 B CN106669953 B CN 106669953B
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barrel body
overflow
clean coal
cone
separation
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CN106669953A (en
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夏文成
王天威
倪超
毛玉强
牛晨凯
谢广元
彭耀丽
沙杰
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China University of Mining and Technology CUMT
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B03B5/623Upward current classifiers

Abstract

The utility model discloses a desliming type coarse slime separation overflow clean coal classification device of a liquid-solid fluidized bed, which comprises a separation classification barrel body, a fluid distributor and an overflow desliming device. The sorting classification barrel body consists of a barrel body and a bottom cone, and a tailing valve is arranged at the lower opening of the bottom cone. The feed inlet is arranged at the upper part of the barrel body. The overflow desliming device consists of a top cone and an inclined barrel body, wherein the sectional area of an upper opening of the inclined barrel body is larger than that of a lower opening, and overflow grooves are arranged around the upper opening. The upper opening of the top cone is connected with the lower side of the inclined barrel body and is communicated with the inclined barrel body in a sealing way, and the lower opening of the top cone is provided with a coarse clean coal discharge valve. The fluid distributor is arranged at the bottom of the sorting classification barrel body. Coarse clean coal is discharged through a tip cone tail coarse clean coal discharge valve after the inclined barrel body is settled, fine mud is directly discharged from an overflow groove, the removal capacity of overflow to the fine mud is enhanced, and the quality of overflow products is improved. Meanwhile, the utility model simplifies the separation subsequent desliming and dehydration process, reduces the ash content of the clean coal, reduces the pollution of high ash fine mud to the clean coal and improves the separation effect.

Description

Clay-removing type liquid-solid fluidized bed coarse slime separation overflow clean coal grading device
Technical Field
The utility model relates to a slime separation and classification technology, in particular to a desliming type liquid-solid fluidized bed coarse slime separation overflow clean coal classification device.
Background
Most of the existing coal separation processes adopt a process combining non-grading gravity separation and flotation, no matter before separation or no desliming, the separation granularity limit of gravity separation and flotation is 0.5mm, in fact, the separation effect of coal particles near 0.5mm is poor due to the characteristics of two separation methods, and the national standard (GB/T7186-1998) of the coal particles (generally 3-0.25 mm) is defined as coarse coal slime. The particles are generally recovered by a high-frequency sieve in a coal preparation plant, the ash content of the particles is between the clean coal and the middling coal, and the ash content of the particles is generally 2-5% higher than that of the clean coal, and the final travel of the particles is difficult to confirm. At present, the coal is not classified generally, and most of the coal is mixed with clean coal in part and medium coal in the other part. With the age ofThe ash content requirements of coal products in the current coal market are more and more strict in development and social demands, and in recent years, few coal preparation plants adopt a small-diameter heavy medium cyclone or a spiral separator to separate coarse slime, but satisfactory effects cannot be achieved due to the defects of the two devices. The shortfall of small diameter heavy medium cyclone:
Figure DEST_PATH_IMAGE002
the requirements on the medium are too thin, the preparation and recovery of the medium are difficult and the cost is high; />
Figure DEST_PATH_IMAGE004
The pressure required for feeding is high, the equipment is seriously worn, and the power consumption is high; />
Figure DEST_PATH_IMAGE006
Although the lower limit of the separation granularity is lower, the classification efficiency of finer materials is low, a part of fine mud which is not separated enters the clean coal to influence the ash content of the clean coal, and meanwhile, the clean coal cannot completely replace flotation. The screw separator is not enough: />
Figure 480282DEST_PATH_IMAGE002
The separation density is high, the clean coal cannot reach the ash content of the clean coal which is required finally, and the product cannot be sold as a final product; />
Figure 335106DEST_PATH_IMAGE004
The single processing amount is small, a plurality of devices are needed to be matched for use, the occupied area is large, the height is large, meanwhile, a paddle adjusting and distributing device is needed, and the distributing uniformity is difficult to control; />
Figure 114843DEST_PATH_IMAGE006
Strict requirement on the feeding concentration and difficult control in industrial production.
In the prior art, a fluidization technology in chemical engineering is introduced into the field of coal preparation, and good effects are achieved. The Chinese patent (patent number: ZL 200720037745.0) discloses a liquid-solid fluidized bed coarse slime sorting and classifying device which uses coarse slime itself as a medium and can reduce ash content of the coarse slime. By utilizing the relation that the sedimentation speed of narrow-size-fraction materials is mainly related to the density of particles when the narrow-size-fraction materials interfere with sedimentation, the materials are separated in a fluidization medium formed by the materials. The method is characterized in that a classification cyclone is adopted before feeding, a desliming device such as a cyclone, a high-frequency screen and a coal slime centrifugal machine is adopted after separation, and a part of high-ash fine slime still exists in the final clean coal, so that the pollution of the high-ash fine slime in the feeding to the clean coal is serious, and the separation result is influenced.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the desliming type liquid-solid fluidized bed coarse slime separation overflow clean coal classifying device, which is used for settling and desliming coarse slime overflow products at an overflow outlet of a liquid-solid fluidized bed coarse slime separator, so that high ash and fine slime pollution in overflow of the liquid-solid fluidized bed coarse slime separator is reduced, and therefore, the total clean coal ash is reduced, the product quality is improved, and the comprehensive utilization efficiency of coal resources is improved.
The utility model relates to a desliming type coarse slime separation overflow clean coal classification device of a liquid-solid fluidized bed, which comprises a separation classification barrel body, a fluid distributor and an overflow desliming device.
The classifying barrel body consists of a barrel body and a bottom cone, the upper opening of the bottom cone is in airtight connection with the lower opening of the barrel body, a tailing valve is arranged at the lower opening of the bottom cone, and a bypass pipe controlled by a ore drawing valve is arranged beside the lower opening of the bottom cone. The upper part of the barrel body is provided with a feeding sleeve (feeding port), and the feeding sleeve is sleeved in the feeding sleeve.
The overflow desliming device consists of a top cone and an inclined barrel body, wherein the sectional area of an upper opening of the inclined barrel body is larger than that of a lower opening, overflow grooves are formed in the periphery of the upper opening of the inclined barrel body, and overflow pipes are arranged at the bottoms of the overflow grooves. The upper opening of the top cone is connected with the lower side of the inclined barrel body and is communicated with the inclined barrel body in a sealing way, and the lower opening of the top cone is provided with a coarse clean coal discharge valve.
The fluid distributor is arranged at the bottom of the sorting classification barrel body and is communicated with the connecting pipe outside the barrel body.
The utility model relates to a coarse slime separation overflow clean coal classification device of a desliming liquid-solid fluidized bed, which comprises the following working processes:
the material evenly enters the feeding sleeve through the feeding pipe, and moves downwards by gravity to enter the sorting classification barrel body. After the materials entering the sorting classification barrel move downwards for a certain distance step by step, the materials start to be separated according to the density, the flow speed of the fluid is gradually reduced in the ascending process due to the fact that the transverse sectional area of the inclined barrel is large and small, fine particles move upwards to enter an overflow groove through a peripheral overflow weir, and the size of overflow is controlled by a coarse clean coal discharge valve arranged at the lower opening of a top cone and a tailing valve arranged at the lower opening of a bottom cone for controlling the density of the barrel. The fine slime and most of water overflowed from the coarse slime separation and classification of the liquid-solid fluidized bed enter the overflow tank through the peripheral overflow weir at the upper part of the inclined barrel body, and coarse clean coal flows out through the coarse clean coal discharge valve at the lower opening of the tip cone, so that the desliming and concentration effects of the overflow of the coarse slime separation and classification machine of the liquid-solid fluidized bed are realized. The material with higher density continuously moves downwards to the fluid distributor, enters the fluidized bed layer, the material with higher density than the fluidized bed layer passes through the bed layer (the fluid distributor) to enter the bottom, is discharged through the tailing valve to become tailings, and the material with middle density moves back and forth in the bed layer up and down, so that separation is gradually realized after a period of time. The fluidized bed layer is formed by taking high-density materials in the feed as a medium and rising water entering through a fluid distributor as fluid.
The device reduces the pollution of high-ash fine slime in overflow of the liquid-solid fluidized bed coarse slime separator, simplifies the subsequent desliming and dehydration process of separation, reduces the ash content of clean coal, reduces the pollution of high-ash fine slime to clean coal, and improves the separation effect. The high-precision separation under the low density can be realized, the clean coal is less polluted by fine mud, the clean coal ash content is lower, and when the feeding ash content is below 25%, the clean coal ash content after separation is equal to or lower than the clean coal ash content after the gravity separation and the flotation.
Drawings
FIG. 1 is a schematic diagram of a coarse slime separation overflow cleaned coal classification device of a desliming liquid-solid fluidized bed.
In the figure: 1-overflow pipe, 2-tip cone, 3-coarse clean coal discharge valve, 4-upper barrel, 5-flange, 6-fluid distributor, 7-ore drawing valve, 8-tailing valve, 9-bottom cone, 10-lower barrel, 11-feeding sleeve, 12-feeding pipe, 13-inclined barrel and 14-overflow tank.
Detailed Description
Embodiments of the utility model are further described below with reference to the accompanying drawings:
as shown in fig. 1, the coarse slime separation overflow clean coal classification device of the desliming type liquid-solid fluidized bed comprises a separation classification barrel body, an overflow desliming device and a fluid distributor 6. The sorting classifying barrel body consists of an upper barrel body 4, a lower barrel body 10 and a bottom cone 9, wherein the upper barrel body and the lower barrel body are connected into a whole through a flange, the upper opening of the bottom cone 9 is connected with the lower opening of the lower barrel body, a fluid distributor is arranged between the bottom cone 9 and the lower barrel body 10, and the fluid distributor is communicated with an outer connecting pipe. The fluid distributor is the prior art, and the structure of the fluid distributor is fully disclosed in Chinese patent (patent number: ZL 200720037745.0). The upper part of the upper barrel body 4 is provided with a feeding sleeve (feeding port) 11, and a feeding pipe 12 is sleeved in the feeding sleeve. The overflow desliming device consists of an inclined barrel body 13 with a large cross section and a small cross section and a tip cone 2. The upper periphery of the inclined barrel body is sleeved with an overflow groove 14, and the bottom of the overflow groove is provided with an overflow pipe 1. A coarse clean coal discharging valve 3 for controlling the flow of coarse coal slime is arranged at the lower opening (outlet) of the tip cone. The lower opening (outlet) of the bottom cone 9 is provided with a tailing valve 8 for controlling the density of the barrel body, and the side of the outlet of the bottom cone is provided with a bypass pipe controlled by a ore drawing valve 7 so as to clean tailings.
The working process is that the materials uniformly enter the feeding sleeve through the feeding pipe and move downwards by gravity to enter the sorting classification barrel body. After the materials entering the sorting classification barrel move downwards for a certain distance step by step, the materials start to be separated according to the density, the flow speed of the fluid is gradually reduced in the ascending process due to the fact that the transverse sectional area of the inclined barrel is large and small, fine particles move upwards to enter an overflow groove through a peripheral overflow weir, and the size of overflow is controlled by a coarse clean coal discharge valve arranged at the lower opening of a top cone and a tailing valve arranged at the lower opening of a bottom cone for controlling the density of the barrel. The fine slime and most of water overflowed from the coarse slime separation and classification of the liquid-solid fluidized bed enter the overflow tank through the peripheral overflow weir at the upper part of the inclined barrel body, and coarse clean coal flows out through the coarse clean coal discharge valve at the lower opening of the tip cone, so that the desliming and concentration effects of the overflow of the coarse slime separation and classification machine of the liquid-solid fluidized bed are realized. The material with higher density continuously moves downwards to the fluid distributor, enters the fluidized bed layer, the material with higher density than the fluidized bed layer passes through the bed layer (the fluid distributor) to enter the bottom, is discharged through the tailing valve to become tailings, and the material with middle density moves back and forth in the bed layer up and down, so that separation is gradually realized after a period of time. The fluidized bed layer is formed by taking high-density materials in the feed as a medium and rising water entering through a fluid distributor as fluid.

Claims (1)

1. A desliming type liquid-solid fluidized bed coarse slime separation overflow clean coal classification device comprises a separation classification barrel body, a fluid distributor and an overflow desliming device; the method is characterized in that:
the sorting classification barrel body consists of a barrel body and a bottom cone, wherein the upper opening of the bottom cone is in airtight connection with the lower opening of the barrel body, and the lower opening of the bottom cone is provided with a tailing valve; the upper part of the barrel body is provided with a feeding sleeve, and the feeding sleeve is sleeved in the feeding sleeve;
the overflow desliming device consists of a top cone and an inclined barrel body, wherein an overflow groove is arranged around the upper opening of the inclined barrel body, and an overflow pipe is arranged at the bottom of the overflow groove; the upper opening of the top cone is connected with the side lower surface of the inclined barrel body and communicated with the inclined barrel body in a sealing way, and the lower opening of the top cone is provided with a coarse clean coal discharge valve;
the fluid distributor is arranged at the bottom of the sorting classification barrel body and is communicated with the connecting pipe outside the barrel body;
the sectional area of the upper opening of the inclined barrel body is larger than that of the lower opening;
and a bypass pipe controlled by the ore drawing valve is arranged beside the lower opening of the bottom cone.
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CN108435406B (en) * 2018-04-04 2024-03-15 中国矿业大学 Coarse slime sorting unit with stable fluidization environment
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CN102441479B (en) * 2011-12-20 2014-03-05 华北科技学院 Liquid and solid fluidized bed sorting machine for three products and working method thereof
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CN205288668U (en) * 2015-12-22 2016-06-08 大同煤矿集团有限责任公司 Coarse slime sorting machine
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