CN106694204B - Coarse slime separation overflow clean coal desliming grading device of liquid-solid fluidized bed - Google Patents

Abstract

The utility model discloses a coarse slime separation overflow clean coal desliming 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 classifying barrel body consists of an upper barrel body, a lower barrel body and a bottom cone, wherein the upper opening of the bottom cone is connected to the lower part of the lower barrel body, and the lower opening of the bottom cone is provided with a tailing valve. The fluid distributor is arranged between the lower barrel body and the bottom cone. The overflow desliming device consists of an inclined barrel body, a flow dividing plate and an overflow groove. The sectional area of the upper opening of the inclined barrel body is larger than that of the lower opening. The splitter plate is obliquely arranged at the upper part of the inclined barrel body. The overflow groove is arranged around the top of the inclined barrel body, the flow dividing plate divides the overflow groove into a left part and a right part, the coarse grain overflow pipe is communicated with the right half part of the overflow groove, and the fine grain overflow pipe is communicated with the left half part of the overflow groove. 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.

Description

Coarse slime separation overflow clean coal desliming grading device of liquid-solid fluidized bed

Technical Field

The utility model relates to a slime separation and classification technology, in particular to a coarse slime separation overflow clean coal desliming classification device of a liquid-solid fluidized bed.

Background

In the prior art, most coal separation processes adopt a combination process of 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 development of the age and the demands of society, the ash content requirements of coal products in the current coal market are more and more strict, 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:

the requirements on the medium are too thin, the preparation and recovery of the medium are difficult and the cost is high; />

The pressure required for feeding is high, the equipment is seriously worn, and the power consumption is high; />

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: />

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; />

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; />

Strict requirement on the feeding concentration and difficult control in industrial production.

In the existing coal preparation process, a fluidization technology in chemical engineering is introduced into the coal preparation field, so that a good effect is achieved. The utility model patent (patent number ZL 200720037745.0) discloses a liquid-solid fluidized bed coarse slime sorting and classifying device, which provides a liquid-solid fluidized bed coarse slime sorting 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 existing in the prior art and provides a liquid-solid fluidized bed coarse slime separation overflow clean coal desliming grading device, which is used for carrying out sedimentation desliming on 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, thereby reducing total clean coal ash and improving product quality and comprehensive utilization efficiency of coal resources.

The utility model relates to a coarse slime separation overflow clean coal desliming 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 classifying barrel body consists of an upper barrel body, a lower barrel body and a bottom cone, wherein the upper barrel body and the lower barrel body are connected through a flange, an upper opening of the bottom cone is connected to the lower part of the lower barrel body, a tailing valve is arranged at a lower opening of the bottom cone, and a bypass pipe controlled by a mineral release valve is arranged beside a lower opening side of the bottom cone.

The fluid distributor is arranged between the lower barrel body and the bottom cone and communicated with the connecting pipe outside the barrel body.

The overflow desliming device consists of an inclined barrel body, a flow dividing plate and an overflow groove. The splitter plate is obliquely arranged on the upper part of the inclined barrel body, and the inclination angle of the splitter plate is consistent with the inclination angle of the inclined barrel body. The overflow groove is arranged around the top of the inclined barrel body, the flow dividing plate divides the overflow groove into a left part and a right part, the coarse grain overflow pipe is communicated with the right half part of the overflow groove, the fine grain overflow pipe is communicated with the left half part of the overflow groove, the upper part of the upper barrel body is provided with a feeding sleeve, and the feeding sleeve is sleeved in the feeding sleeve.

The sectional area of the upper opening of the inclined barrel body is larger than that of the lower opening.

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, under the action of the splitter plate, fine particles move upwards to enter the left half part of the overflow groove through the peripheral overflow weir and are discharged through the fine particle overflow pipe arranged on the left half part, and coarse particles move upwards to enter the right half part of the overflow groove through the peripheral overflow weir and are discharged through the coarse particle overflow pipe arranged on the right half part. The fine slime overflowed in the liquid-solid fluidized bed coarse slime separation and classification enters the left half part of the overflow groove through the peripheral overflow weir at the upper part of the inclined barrel, and the coarse clean coal enters the right half part of the overflow groove through the peripheral overflow weir at the upper part of the inclined barrel, so that the desliming and concentration effects of the overflow of the liquid-solid fluidized bed coarse slime separation and classification machine are realized. The material with higher density continuously moves downwards to the fluidized bed layer (fluid distributor), the material with higher density than the fluidized bed layer passes through the bed layer (fluid distributor) to enter the bottom, the material is discharged through a tailing valve to become tailings, and the material with middle density moves back and forth up and down in the bed layer, and 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 liquid-solid fluidized bed coarse slime separation overflow cleaned coal desliming classification device.

In the figure: the device comprises a 1-fine particle overflow pipe, a 2-flow dividing plate, a 3-inclined barrel body, a 4-upper barrel body, a 5-flange, a 6-fluid distributor, a 7-ore drawing valve, an 8-tailing valve, a 9-bottom cone, a 10-lower barrel body, a 11-feeding sleeve, a 12-feeding pipe, a 13-coarse particle overflow pipe and a 14-overflow groove.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

As shown in fig. 1, the coarse slime separation overflow clean coal desliming classification device of the liquid-solid fluidized bed mainly comprises a separation classification barrel body, a feeding device, an overflow desliming device and a fluid distributor. The sorting classifying barrel body consists of an upper barrel body 4, a lower barrel body 10 and a bottom cone 9, and the upper barrel body and the lower barrel body are connected into a whole through a flange 5. The feeding device consists of a feeding sleeve 11 and a feeding pipe 12 and is arranged at the upper part of the upper barrel body. The overflow desliming device consists of an inclined barrel body 3 with a large cross section area and a small cross section area, a flow dividing plate 2 and an overflow groove 14. The splitter plate 2 is obliquely arranged on the upper part of the inclined barrel body 3, and the inclination angle of the splitter plate is consistent with the inclination angle of the inclined barrel body. The upper periphery of the inclined barrel body 3 is sleeved with an overflow groove 14, the overflow groove 14 is divided into a left part and a right part by a flow dividing plate 2, a fine grain overflow pipe 14 is arranged at the outlet of the left half part of the overflow groove, and a coarse grain overflow pipe 1 is arranged at the outlet of the right half part of the overflow groove. A fluid distributor 6 is arranged between the lower barrel body 10 and the bottom cone 9, the fluid distributor is in the prior art, and the structure of the fluid distributor is fully disclosed in Chinese patent (ZL 20070037745.0). The fluid distributor 6 is communicated with the connecting pipe outside the lower barrel body. The outlet of the bottom cone is provided with a tailing valve 8 for controlling the density of the barrel body, and the outlet side of the bottom cone is provided with a bypass pipe 7 controlled by a tailing discharging valve 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, under the action of the splitter plate, fine particles move upwards to enter the left half part of the overflow groove through the peripheral overflow weir and are discharged through the fine particle overflow pipe arranged on the left half part, and coarse particles move upwards to enter the right half part of the overflow groove through the peripheral overflow weir and are discharged through the coarse particle overflow pipe arranged on the right half part. The fine slime overflowed in the liquid-solid fluidized bed coarse slime separation and classification enters the left half part of the overflow groove through the peripheral overflow weir at the upper part of the inclined barrel, and the coarse clean coal enters the right half part of the overflow groove through the peripheral overflow weir at the upper part of the inclined barrel, so that the desliming and concentration effects of the overflow of the liquid-solid fluidized bed coarse slime separation and classification machine are realized. The material with higher density continuously moves downwards to the fluidized bed layer (fluid distributor), the material with higher density than the fluidized bed layer passes through the bed layer (fluid distributor) to enter the bottom, the material is discharged through a tailing valve to become tailings, and the material with middle density moves back and forth up and down in the bed layer, and 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 (2)

1. The coarse slime separating and overflow clean coal desliming classifying device of the liquid-solid fluidized bed comprises a separating and classifying barrel body, a fluid distributor and an overflow desliming device; the method is characterized in that:

the sorting classification barrel body consists of an upper barrel body, a lower barrel body and a bottom cone, wherein the upper barrel body is connected with the lower barrel body through a flange, the upper opening of the bottom cone is connected to the lower part of the lower barrel body, and the lower opening of the bottom cone is provided with a tailing valve;

the fluid distributor is arranged between the lower barrel body and the bottom cone and is communicated with the connecting pipe outside the barrel body;

the overflow desliming device consists of an inclined barrel body, a flow dividing plate and an overflow groove; the flow dividing plate is obliquely arranged at the upper part of the inclined barrel body, and the inclination angle of the flow dividing plate is consistent with the inclination angle of the inclined barrel body; the overflow groove is arranged around the top of the inclined barrel body, the flow dividing plate divides the overflow groove into a left part and a right part, the coarse grain overflow pipe is communicated with the right half part of the overflow groove, the fine grain overflow pipe is communicated with the left half part of the overflow groove, the upper part of the upper barrel body is provided with a feeding sleeve, and the feeding sleeve is sleeved in the feeding sleeve;

the sectional area of the upper opening of the inclined barrel body is larger than that of the lower opening.

2. The liquid-solid fluidized bed coarse slime separation overflow cleaned coal desliming classification device according to claim 1, characterized in that: a bypass pipe controlled by a ore drawing valve is arranged beside the lower opening of the bottom cone.

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