CN212383872U - System for reducing clean coal mud ash content in heavy-medium coal separation process - Google Patents

System for reducing clean coal mud ash content in heavy-medium coal separation process Download PDF

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CN212383872U
CN212383872U CN202020314119.7U CN202020314119U CN212383872U CN 212383872 U CN212383872 U CN 212383872U CN 202020314119 U CN202020314119 U CN 202020314119U CN 212383872 U CN212383872 U CN 212383872U
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coal
medium
cyclone
heavy
clean
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王鹏
姚伟民
蒋小龙
陈立龙
王浩
杜慧
童杰
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Tangshan Senpu Engineering Design Co ltd
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Tangshan Senpu Engineering Design Co ltd
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Abstract

The utility model relates to a coal washing processing technology field is a system that reduces heavy meson coal dressing in-process clean coal mud ash and divides. The device comprises a raw coal qualified medium barrel, a flow divider, a clean coal medium removing screen, a middling medium removing screen, a gangue medium removing screen, a clean coal magnetic separator, a middling magnetic separator and a gangue roller separator, wherein a discharge pipe of the raw coal qualified medium barrel is connected with an inlet of a coal slime dense medium cyclone, an underflow outlet of the coal slime dense medium cyclone is connected with a feeding port of the middling magnetic separator, and an overflow port of the coal slime dense medium cyclone is connected with the raw coal qualified medium barrel. The utility model discloses a technical scheme with clean coal, the suspension reposition of redundant personnel to magnet separator separately under the gangue demeshing sieve bend, the ingenious coal slime that utilizes simultaneously heavily is situated between and selects separately the effect, and the high grey coal slime in the suspension of discharging has reduced the ash content of coal slime in the suspension, obtains the qualified clean coal slime of ash content to increase the clean coal rate of recovery, compensatied the not enough of traditional handicraft.

Description

System for reducing clean coal mud ash content in heavy-medium coal separation process
Technical Field
The utility model relates to a coal washing processing technology field is a system that reduces heavy meson coal dressing in-process clean coal mud ash and divides.
Background
According to statistics, the coal yield of China is 36.8 hundred million tons in 2018, the coal consumption accounts for 59 percent of the total energy consumption, and the coal is still the main energy pattern for a long time. China has poor coal resources and large reserves of low-quality coal, which account for about 40 percent, the ultra-low ash coal with ash content less than 10 percent only accounts for 15 to 20 percent of the reserve, and the medium-high sulfur coal with sulfur content more than 1 percent accounts for 33 percent of the total amount. Coal makes a great contribution to national economic development and brings serious environmental pollution, 875 ten thousand tons of SO2 are discharged in 2017, and the emission caused by coal combustion accounts for 85 percent. Therefore, the clean utilization of the coal has important significance for environmental protection, the washing and the separation of the coal are the source of the clean utilization of the coal, most of ash and sulfur in the coal can be removed through the washing and the separation, and the emission of smoke dust and SO2 can be greatly reduced after the coal is combusted. The raw coal entering rate of China in 2018 reaches 71.8%.
The dense medium coal separation technology, especially the dense medium cyclone coal separation technology has the characteristics of high separation precision, high clean coal recovery rate, high desulfurization and ash reduction efficiency and the like, and is rapidly popularized and applied in the construction of coal separation plants.
The general process of the heavy-medium coal separation plant comprises the following steps: the raw coal of 50-0.25mm is separated by heavy medium, and the coal slime of 0.25-0mm is separated by flotation. Dense medium separation (reselection for short) is separation by using density difference of minerals, and has high separation precision. The gravity separation equipment mainly comprises a dense medium cyclone, a dense medium shallow slot separator, a coal slime dense medium cyclone, a coal slime separation interference bed and the like. Wherein most heavy medium coal separation plants adopt heavy medium cyclones to separate raw coal.
The raw coal is separated by the dense medium cyclone into clean coal, middlings and gangue by means of suspensions with different densities. The suspension is prepared by mixing heavy (magnetite powder), coal slime and water according to a proportion. The component proportion of the suspension has a decisive influence on the separation effect of the dense medium cyclone, wherein the coal slime proportion and the coal slime ash content in the suspension have the greatest influence. How to reduce the ash content of the clean coal slime in the heavy-medium coal separation process becomes a research direction of the coal separation process.
The conventional process introduction, as shown in fig. 1, is illustrated as follows:
raw coal enters a dense medium cyclone (1) to separate three products of clean coal, middlings and gangue, wherein the clean coal and the suspension enter a clean coal medium removing sieve bend (2) to remove most of the suspension, oversize products enter a clean coal medium removing sieve (5) to wash away media adhered to the clean coal through water spray, and the cleaned coal enters a clean coal magnetic separator (9); the undersize part of the clean coal medium-removing sieve bend (2) enters a raw coal qualified medium barrel (12), the other part of the clean coal medium-removing sieve bend enters a shunt (6), qualified medium with proper amount is shunted to a clean coal magnetic separator (9) according to the content of coal slime of selected raw coal, magnetic concentrate enters the raw coal qualified medium barrel (12) for recycling, and magnetic tailings (clean coal slime) enter a downstream production process.
The middlings and the suspension separated by the dense medium cyclone (1) enter a middling medium removing sieve bend (3) to remove most of the suspension, undersize enters a raw coal qualified medium barrel (12), oversize enters a middling medium removing sieve (7), media stuck to middlings are washed away by water spray and enter a middling magnetic separator (10), magnetic concentrate enters the raw coal qualified medium barrel (12) to be recycled, and magnetic tailings (middling coal slime) enter a downstream production process.
Gangue and suspension liquid separated by the heavy medium cyclone (1) enter a gangue medium removal sieve bend (4) to remove most of the suspension liquid, undersize materials enter a raw coal qualified medium barrel (12), oversize materials enter a gangue medium removal sieve (8) and wash away media stuck to the gangue through water spray and enter a gangue magnetic separator (11), magnetic concentrate enters the raw coal qualified medium barrel (12) for recycling, and magnetic tailings (gangue powder) enter a downstream production process.
The process has the disadvantages that only part of the suspension liquid under the medium-removing arc-shaped sieve of the clean coal enters the clean coal magnetic separator through the flow divider, most of the suspension liquid of the middlings and the gangue sections and the high-ash coal slime contained in the suspension liquid return to the qualified medium barrel of the raw coal for circulation, so that the ash content of the clean coal slime separated by the heavy medium cyclone is higher, a coal separation plant can only press down the ash content of the clean coal of other particle fractions to obtain the clean coal with qualified comprehensive ash content, and the recovered valuable clean coal is lost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a system for simply and efficiently reducing the clean coal mud ash content in the heavy medium coal separation process.
The aim of the invention is achieved by the following method:
the first scheme is as follows:
a system for reducing the ash content of clean coal slurry in the process of dense-medium coal separation comprises a raw coal qualified medium barrel, a flow divider, a clean coal medium removing screen, a medium coal medium removing screen, a gangue medium removing screen, a clean coal magnetic separator, a medium coal magnetic separator and a gangue roller separator, wherein a discharge pipe of the raw coal qualified medium barrel is connected with an inlet of a coal slurry dense-medium cyclone, a bottom flow outlet of the coal slurry dense-medium cyclone is connected with a feeding port of the medium coal magnetic separator, and an overflow port of the coal slurry dense-medium cyclone is connected with the raw coal qualified medium barrel.
The preferable scheme of the first scheme is as follows: a connecting pipeline is additionally arranged between the bottom outlet pipeline of the gangue medium-removing sieve and the inlet of the gangue magnetic separator, and a second electric control valve is arranged on the connecting pipeline.
A first electric control valve is arranged on a pipeline between a raw coal qualified medium barrel discharge pipe and an inlet of a coal slime heavy medium cyclone.
The coal slime dense medium cyclone adopts a two-product dense medium cyclone or a three-product dense medium cyclone; and a pressure sensor is arranged on a feeding pipe of the coal slime dense medium cyclone.
Scheme II:
a system for reducing the ash content of clean coal slurry in the process of dense-medium coal separation comprises a raw coal qualified medium barrel, a flow divider, a clean coal medium-removing sieve, a medium coal medium-removing sieve, a gangue medium-removing sieve, a clean coal magnetic separator, a medium coal magnetic separator and a gangue roller separator, wherein a connecting pipeline is additionally arranged between the underflow outlet pipeline of the gangue medium-removing sieve and the inlet of the gangue magnetic separator, and a second electric control valve is arranged on the connecting pipeline.
The preferable scheme of the second scheme is as follows: the discharge pipe of the raw coal qualified medium barrel is connected with the inlet of a coal slime heavy medium cyclone, the underflow outlet of the coal slime heavy medium cyclone is connected with the feed inlet of a middling coal magnetic separator, and the overflow port of the coal slime heavy medium cyclone is connected with the raw coal qualified medium barrel.
A first electric control valve is arranged on a pipeline between a raw coal qualified medium barrel discharge pipe and an inlet of a coal slime heavy medium cyclone.
The third scheme is as follows:
a system for reducing the ash content of clean coal slurry in the process of dense-medium coal separation comprises a raw coal qualified medium barrel, a flow divider, a clean coal medium removing screen, a middlings medium removing screen, a gangue medium removing screen, a clean coal magnetic separator, a middlings magnetic separator and a gangue roller separator, wherein a discharge pipe of the raw coal qualified medium barrel is connected with an inlet of a coal slurry dense-medium cyclone, a bottom flow outlet of the coal slurry dense-medium cyclone is connected with a feeding port of the middlings magnetic separator, and an overflow port of the coal slurry dense-medium cyclone is connected with the raw coal qualified medium barrel; a connecting pipeline is additionally arranged between the bottom outlet pipeline of the gangue medium-removing sieve and the inlet of the gangue magnetic separator.
The preferable scheme of the third scheme is as follows: and a second electric control valve is arranged on the connecting pipeline, and a first electric control valve is arranged on a pipeline between a feeding pipe of the raw coal dense medium cyclone and an inlet of the coal slime dense medium cyclone.
The coal slime dense medium cyclone adopts a two-product dense medium cyclone or a three-product dense medium cyclone.
The utility model discloses a technical scheme with clean coal, the suspension reposition of redundant personnel to magnet separator separately under the gangue demeshing sieve bend, the ingenious coal slime that utilizes simultaneously heavily is situated between and selects separately the effect, and the high grey coal slime in the suspension of discharging has reduced the ash content of coal slime in the suspension, obtains the qualified clean coal slime of ash content to increase the clean coal rate of recovery, compensatied the not enough of traditional handicraft.
Description of the drawings:
fig. 1 is a schematic view of a prior art structure.
Fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The present invention is described in detail below with reference to the following embodiments and accompanying drawings:
referring to fig. 2: in the figure: the device comprises a dense medium cyclone 1, a clean coal medium removing sieve bend 2, a middling medium removing sieve bend 3, a gangue medium removing sieve bend 4, a clean coal medium removing sieve bend 5, a flow divider 6, a middling medium removing sieve 7, a gangue medium removing sieve 8, a clean coal magnetic separator 9, a middling magnetic separator 10, a gangue magnetic separator 11, a raw coal qualified medium barrel 12, a raw coal qualified medium pump 13, a coal slime dense medium cyclone 14, a first electric control valve 15 and a second electric control valve 16.
On the basis of the traditional process flow (see the attached figure 2), the following devices are added:
the discharging pipe of the raw coal qualified medium pump 13 is respectively connected with the feeding pipe of the dense medium cyclone 1 and the feeding pipe of the coal slime dense medium cyclone 14, and a first electric control valve 15 and a pressure sensor are arranged on the feeding pipeline of the coal slime dense medium cyclone 14. The coal slime dense medium cyclone 14 overflows and returns to the raw coal qualified medium barrel 12, and the underflow enters the middlings magnetic separator 10.
A pipeline is newly added below the gangue removal sieve bend 4 to a feeding port of a gangue magnetic separator 11, and a first electric control valve 16 is arranged on the pipeline.
A discharge pipe of the raw coal qualified medium pump 13 is provided with a pressure sensor, a density sensor and a magnetic substance sensor; the data of the flow divider 6, the first electric control valve 15 and the second electric control valve 16 can be transmitted to an automatic control system.
The automatic control system carries out online detection on the suspension fed into the raw coal dense medium cyclone 1 through a pressure sensor, a density sensor and a magnetic substance sensor and automatically controls the sorting parameters; according to the sorted clean coal ash content data, the automatic control of the density and viscosity of the suspension is realized by controlling the opening degrees of the coal slime dense-medium feeding valve, the diverter, the gangue diversion electric control valve and the water feeding valve, so that the high-precision sorting of the raw coal dense-medium cyclone is realized, and the clean coal with qualified ash content is obtained.

Claims (10)

1. The utility model provides a system for reducing dense medium selects qualified medium bucket of coal in-process clean coal mud ash content of coal, includes the qualified medium bucket of raw coal, the shunt, clean coal sculping sieve, middlings sculping sieve, waste rock sculping sieve, clean coal magnet separator, middlings magnet separator and waste rock roller selection machine, its characterized in that: the discharge pipe of the raw coal qualified medium barrel is connected with the inlet of a coal slime heavy medium cyclone, the underflow outlet of the coal slime heavy medium cyclone is connected with the feed inlet of a middling coal magnetic separator, and the overflow port of the coal slime heavy medium cyclone is connected with the raw coal qualified medium barrel.
2. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 1, wherein: a connecting pipeline is additionally arranged between the bottom outlet pipeline of the gangue medium-removing sieve and the inlet of the gangue magnetic separator, and a second electric control valve is arranged on the connecting pipeline.
3. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 1, wherein: a first electric control valve is arranged on a pipeline between a raw coal qualified medium barrel discharge pipe and an inlet of a coal slime heavy medium cyclone.
4. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 1, wherein: the coal slime dense medium cyclone adopts a two-product dense medium cyclone or a three-product dense medium cyclone; and a pressure sensor is arranged on a feeding pipe of the coal slime dense medium cyclone.
5. The utility model provides a system for reducing dense medium selects qualified medium bucket of coal in-process clean coal mud ash content of coal, includes the qualified medium bucket of raw coal, the shunt, clean coal sculping sieve, middlings sculping sieve, waste rock sculping sieve, clean coal magnet separator, middlings magnet separator and waste rock roller selection machine, its characterized in that: a connecting pipeline is additionally arranged between the bottom outlet pipeline of the gangue medium-removing sieve and the inlet of the gangue magnetic separator, and a second electric control valve is arranged on the connecting pipeline.
6. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 5, wherein: the discharge pipe of the raw coal qualified medium barrel is connected with the inlet of a coal slime heavy medium cyclone, the underflow outlet of the coal slime heavy medium cyclone is connected with the feed inlet of a middling coal magnetic separator, and the overflow port of the coal slime heavy medium cyclone is connected with the raw coal qualified medium barrel.
7. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 6, wherein: a first electric control valve is arranged on a pipeline between a raw coal qualified medium barrel discharge pipe and an inlet of a coal slime heavy medium cyclone.
8. The utility model provides a system for reducing dense medium selects qualified medium bucket of coal in-process clean coal mud ash content of coal, includes the qualified medium bucket of raw coal, the shunt, clean coal sculping sieve, middlings sculping sieve, waste rock sculping sieve, clean coal magnet separator, middlings magnet separator and waste rock roller selection machine, its characterized in that: a discharge pipe of a raw coal qualified medium barrel is connected with an inlet of a coal slime heavy medium cyclone, an underflow outlet of the coal slime heavy medium cyclone is connected with a feed inlet of a middling magnetic separator, and an overflow port of the coal slime heavy medium cyclone is connected with the raw coal qualified medium barrel; a connecting pipeline is additionally arranged between the bottom outlet pipeline of the gangue medium-removing sieve and the inlet of the gangue magnetic separator.
9. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 8, wherein: and a second electric control valve is arranged on the connecting pipeline, and a first electric control valve is arranged on a pipeline between a feeding pipe of the raw coal dense medium cyclone and an inlet of the coal slime dense medium cyclone.
10. The system for reducing clean coal mud ash in the heavy-medium coal separation process according to claim 8, wherein: the coal slime dense medium cyclone adopts a two-product dense medium cyclone or a three-product dense medium cyclone.
CN202020314119.7U 2020-03-13 2020-03-13 System for reducing clean coal mud ash content in heavy-medium coal separation process Active CN212383872U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113210125A (en) * 2021-05-17 2021-08-06 鄂托克旗建元洗煤有限责任公司 Method and system for partial middling heavy medium rewashing
CN113441275A (en) * 2021-07-02 2021-09-28 唐山国华科技国际工程有限公司 High-ash coking coal deep dissociation separation equipment and method
CN113731620A (en) * 2021-08-10 2021-12-03 新疆宝明矿业有限公司 Medium recovery method and medium recovery system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113210125A (en) * 2021-05-17 2021-08-06 鄂托克旗建元洗煤有限责任公司 Method and system for partial middling heavy medium rewashing
CN113441275A (en) * 2021-07-02 2021-09-28 唐山国华科技国际工程有限公司 High-ash coking coal deep dissociation separation equipment and method
CN113731620A (en) * 2021-08-10 2021-12-03 新疆宝明矿业有限公司 Medium recovery method and medium recovery system

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