CN206492603U - Desliming type liquid-solid fluid bed coarse slime size overflow cleaned coal grading plant - Google Patents

Abstract

The utility model discloses a desliming type liquid-solid fluidized bed coarse coal slime sorting overflow clean coal grading device, which comprises a sorting and grading barrel body, a fluid distributor and an overflow desliming device. The sorting and grading bucket consists of a bucket and a bottom cone, and a tailings valve is installed at the bottom of the bottom cone. The material inlet is arranged on the upper part of the barrel body. The overflow desliming device is composed of a top cone and an inclined barrel body. The cross-sectional area of the upper mouth of the inclined barrel body is larger than that of the lower mouth, and an overflow tank is arranged around the upper mouth. The upper mouth of the top cone is connected to the side underside of the inclined barrel body, and is airtightly communicated with the inclined barrel body, and the lower mouth of the top cone is provided with a coarse and clean coal discharge valve. The fluid distributor is arranged at the bottom of the sorting and grading barrel. After the inclined barrel settles, the coarse and clean coal is discharged through the coarse and clean coal discharge valve at the tail of the top cone, and the fine mud is directly discharged from the overflow tank, which strengthens the ability of the overflow to remove fine mud and improves the quality of the overflow product. The utility model simplifies the subsequent desliming and dehydration process of sorting, reduces the ash content of clean coal, reduces the pollution of high-ash fine mud to clean coal, and improves the sorting effect.

Description

Desliming type liquid-solid fluidized bed coarse coal slime separation overflow clean coal classification device

technical field

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

Background technique

Most of the existing coal preparation processes use a combination of non-graded gravity separation and flotation. Regardless of whether desliming is performed before selection or not, the separation particle size limit of gravity separation and flotation is 0.5mm. In fact, due to the two The characteristics of the separation method itself make the separation effect of coal particles around 0.5mm poor, and this part of coal particles (generally 3-0.25mm) is defined as coarse coal slime by the national standard (GB/T 7186-1998). These particles are generally recovered separately through high-frequency sieves in coal preparation plants. Their ash content is between clean coal and medium coal, generally 2-5% higher than that of clean coal, and their final destination is difficult to confirm. At present, it is generally not sorted, and most of them are mixed with clean coal and the other part with medium coal. With the development of the times and the needs of the society, the current coal market has more and more strict requirements on the ash content of coal products. However, due to the deficiencies of the two devices themselves, satisfactory results cannot be achieved. Disadvantages of small diameter heavy medium cyclone: The requirements for the medium are too fine, and the preparation and recycling of the medium are difficult and costly; High pressure is required for feeding materials, serious equipment wear and power consumption; Although the lower limit of the sorting particle size is low, the classification efficiency of finer materials is low, and a part of fine mud that has not been sorted enters the clean coal, affecting the ash content of the clean coal, and it cannot completely replace flotation. Insufficient spiral separator: The separation density is high, the clean coal cannot meet the final required clean coal ash content, and its products cannot be sold as final products; The processing capacity of a single unit is small, and multiple units need to be used together. It occupies a large area and a large height. At the same time, it needs paddle adjustment and distribution devices, and the distribution uniformity is difficult to control; There are strict requirements on the concentration of the feed material, which is difficult to control in industrial production.

In the prior art, the introduction of chemical fluidization technology into the field of coal preparation has achieved good results. Chinese utility model patent (patent number: ZL200720037745.0) discloses a liquid-solid fluidized bed coarse coal slime sorting and grading device, which uses the coarse coal slime itself as a medium and can reduce the ash content of the coarse coal slime. Utilizing the relationship that the sedimentation velocity of the narrow-grained material is mainly related to the density of the particles when the sedimentation is disturbed, the material is sorted in the fluidized medium composed of itself. The desliming devices such as cyclone, high-frequency screen and coal slime centrifuge are used before feeding, and there is still a part of high-ash fine mud in the final clean coal, which causes the high-ash fine mud in the feeding material to Clean coal pollution is serious, affecting the sorting results.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a desliming type liquid-solid fluidized bed coarse coal slime separation overflow clean coal classification device, the coarse coal slime overflow product in the liquid The overflow outlet of the solid fluidized bed coarse slime separator is used for sedimentation and desliming to reduce the high ash and fine mud pollution in the overflow of the liquid solid fluidized bed coarse slime separator, thereby reducing the ash content of the total clean coal and improving the product quality. Quality and comprehensive utilization efficiency of coal resources.

The utility model relates to a desliming type liquid-solid fluidized bed coarse coal slime sorting overflow clean coal grading device, comprising a sorting and grading barrel, a fluid distributor and an overflow desliming device.

The sorting and grading barrel consists of a barrel and a bottom cone. The upper opening of the bottom cone is airtightly connected with the lower opening of the barrel. The lower opening of the bottom cone is provided with a tailings valve. bypass pipe. The upper part of the barrel is provided with a feeding sleeve (feeding port), and the feeding pipe is sleeved in the feeding sleeve.

The overflow desliming device is composed of a top cone and an inclined barrel body, the upper cross-sectional area of the inclined barrel body is larger than the lower mouth cross-sectional area, an overflow groove is arranged around the upper mouth of the inclined barrel body, and an overflow pipe is arranged at the bottom of the overflow groove . The upper mouth of the top cone is connected to the side underside of the inclined barrel body, and is airtightly communicated with the inclined barrel body, and the lower mouth of the top cone is provided with a coarse and clean coal discharge valve.

The fluid distributor is arranged at the bottom of the sorting and grading barrel, and the fluid distributor communicates with the connecting pipe outside the barrel.

The utility model desliming type liquid-solid fluidized bed coarse coal slime separation overflow clean coal classification device, its working process is as follows:

The material enters the feeding sleeve evenly through the feeding pipe, and moves downward by gravity into the sorting and grading barrel. After the materials entering the sorting and grading barrel move down gradually for a certain distance, the materials begin to be separated according to the density. Since the transverse cross-sectional area of the inclined barrel is large at the top and small at the bottom, the flow velocity of the fluid gradually slows down during the upward process, and the fine The particles move upwards and enter the overflow tank through the peripheral overflow weir, and the overflow volume is controlled by the coarse and clean coal discharge valve installed at the lower opening of the top cone and the tailings valve at the lower opening of the bottom cone to control the density of the barrel. Liquid-solid fluidized bed coarse coal slime separation and classification overflow fine slime and most of the water enter the overflow tank through the peripheral overflow weir on the upper part of the inclined barrel body, and the coarse and clean coal passes through the coarse and clean coal at the bottom of the top cone The flow out of the discharge valve realizes the desliming and concentration of the overflow of the liquid-solid fluidized bed coarse slime sorting and classifying machine. The higher density material continues to move down to the fluid distributor and enters the bed of the fluidized bed, and the material with a density higher than the bed density of the fluidized bed passes through the bed (fluid distributor) into the bottom and is discharged through the tailings valve It becomes tailings, while the material with intermediate density moves up and down in the bed, and gradually realizes separation after a period of time. The formation of the fluidized bed is based on the high-density material in the feed as the medium, and the rising water coming in through the fluid distributor as the fluid to form a fluidized bed.

The device of the utility model reduces the pollution of high ash and fine mud in the overflow of the liquid-solid fluidized bed coarse coal slime separator, simplifies the subsequent desliming and dehydration process of sorting, reduces the ash content of clean coal, and reduces the impact of high ash and fine mud on fine coal. Coal pollution, improve the separation effect. It can achieve high-precision separation at low density, clean coal is less polluted by fine mud, and the ash content of clean coal is lower. When the ash content of the incoming material is below 25%, the ash content of clean coal after sorting and gravity separation and flotation clean coal equivalent or lower.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model desliming type liquid-solid fluidized bed coarse coal slime separation overflow clean coal classification device.

In the figure: 1-overflow pipe, 2-top cone, 3-coarse and clean coal discharge valve, 4-upper barrel, 5-flange, 6-fluid distributor, 7-drawing valve, 8-tailings Valve, 9-bottom cone, 10-lower barrel, 11-feeding sleeve, 12-feeding pipe, 13-inclined barrel, 14-overflow tank.

detailed description

Embodiments of the utility model are further described below in conjunction with the accompanying drawings:

As shown in Figure 1, the utility model desliming type liquid-solid fluidized bed coarse coal slime sorting overflow clean coal grading device is composed of a sorting and grading barrel, an overflow desliming device and a fluid distributor 6 . The sorting and grading barrel is composed of an upper barrel 4, a lower barrel 10 and a bottom cone 9, the upper barrel and the lower barrel are connected as one by a flange, and the upper opening of the bottom cone 9 is connected to the bottom of the lower barrel. The mouth is connected, and the fluid distributor is arranged between the bottom cone 9 and the lower barrel body 10, and the fluid distributor communicates with the external connecting pipe. The fluid distributor is an existing technology, and the Chinese utility model patent (patent number: ZL200720037745.0) fully discloses the structure of the fluid distributor. 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 is composed of an inclined barrel body 13 with a large cross-sectional area and a small bottom and a top cone 2. An overflow tank 14 is set on the upper periphery of the inclined bucket body, and an overflow pipe 1 is provided at the bottom of the overflow tank. The lower port (exit) of the top cone is provided with a coarse and clean coal discharge valve 3 to control the flow of coarse coal slime. A tailings valve 8 for controlling the density of the barrel is provided at the lower mouth (exit) of the bottom cone 9, and a bypass pipe controlled by the ore-drawing valve 7 is provided beside the outlet of the bottom cone to facilitate the cleaning of the tailings.

Working process: The material enters the feeding sleeve evenly through the feeding pipe, and moves downward by gravity into the sorting and grading barrel. After the materials entering the sorting and grading barrel move down gradually for a certain distance, the materials begin to be separated according to the density. Since the transverse cross-sectional area of the inclined barrel is large at the top and small at the bottom, the flow velocity of the fluid gradually slows down during the upward process, and the fine The particles move upwards and enter the overflow tank through the peripheral overflow weir, and the overflow volume is controlled by the coarse and clean coal discharge valve installed at the lower opening of the top cone and the tailings valve at the lower opening of the bottom cone to control the density of the barrel. Liquid-solid fluidized bed coarse coal slime separation and classification overflow fine slime and most of the water enter the overflow tank through the peripheral overflow weir on the upper part of the inclined barrel body, and the coarse and clean coal passes through the coarse and clean coal at the bottom of the top cone The flow out of the discharge valve realizes the desliming and concentration of the overflow of the liquid-solid fluidized bed coarse slime sorting and classifying machine. The higher density material continues to move down to the fluid distributor and enters the bed of the fluidized bed, and the material with a density higher than the bed density of the fluidized bed passes through the bed (fluid distributor) into the bottom and is discharged through the tailings valve It becomes tailings, while the material with intermediate density moves up and down in the bed, and gradually realizes separation after a period of time. The formation of the fluidized bed is based on the high-density material in the feed as the medium, and the rising water coming in through the fluid distributor as the fluid to form a fluidized bed.

Claims (3)

1. a kind of desliming type liquid-solid fluid bed coarse slime size overflow cleaned coal grading plant, including sorting classifying staving, fluid point Cloth device and overflow desliming device；It is characterized in that：

The sorting classifying staving is made up of staving and base cone, base cone it is suitable for reading with staving under mouth airtight connection, mouth is set under base cone Mine tailing valve；Staving top is provided with pan feeding sleeve, and feeding pipe is enclosed in pan feeding sleeve；

The overflow desliming device, is made up of addendum cone, oblique staving, and oblique staving surrounding suitable for reading sets overflow launder, and isopipe root is set Put overflow pipe；Addendum cone is suitable for reading to be connected on below the side of oblique staving, and with oblique staving seal joining, the lower mouth of addendum cone sets coarse-fine coal discharge Valve；

The fluid distributor is arranged at the staving bottom of sorting classifying staving, fluid distributor and staving outer connecting pipe UNICOM.

2. desliming type liquid-solid fluid bed coarse slime size overflow cleaned coal grading plant according to claim 1, it is characterized in that：Institute The sectional area suitable for reading for stating oblique staving is more than lower mouth sectional area.

3. desliming type liquid-solid fluid bed coarse slime size overflow cleaned coal grading plant according to claim 1, it is characterized in that：Institute State by base cone Xia Kou sides provided with the bypass pipe controlled by draw valve.