Wet coal slime treatment system for power coal

Abstract

The utility model discloses a wet coal slime treatment system for power coal. The wet coal slime treatment system comprises a hydrocyclone, an arc-shaped sieve, a centrifugal machine, a buffer box, a surface modification machine, a flotation feeding pool, a first-section flotation machine, an ultrahigh pressure filter press, a second-section flotation machine, a thickener and a slurry mixing pool, the device disclosed by the utility model has the advantages that after wet coal slime of the power coal is treated by the hydrocyclone, the sieve bend and the centrifugal machine, a coarse coal slime product can be obtained and reused; liquid separated by the hydrocyclone, the sieve bend and the centrifugal machine is subjected to tempering, flotation and filter pressing to obtain flotation clean coal, and the flotation clean coal can be mixed into fine clean coal to be sold or directly sold independently; filtrate of the filter press and overflow of the thickener are continuously used as follow-up circulating water, so that waste of water resources is reduced; flotation tailings are concentrated and then are driven into a size mixing pool in a gangue separation layer grouting system, the flotation tailings are injected into a separation layer space located above an underground goaf and below a main key layer through the underground filling technology, wet coal slime is finally and effectively utilized, and the wet coal slime is not discharged outwards.

Description

Technical field:

[0001] The utility model relates to the technical field of wet coal slime processing, in particular to a thermal coal wet coal slime processing system. Background technology:

[0002] After washing thermal coal, wet coal slime is usually produced. Due to its high moisture content and low calorific value, wet coal slime has a low price and is difficult to sell. When the coal market is good, it can be sold directly, but when the market is bad, wet coal slime cannot be sold.

[0003] At the same time, wet coal slime is difficult to settle and water is difficult to remove. If it is used as circulating water, there is a problem of too high coal slime content in the circulating water, which affects the sorting operation and further affects the normal operation of the production process system of the coal preparation plant. At the same time, the coal slime in the circulating water is not effectively utilized and most of it is treated by discharge.

[0004] Therefore, it is necessary to propose a treatment plan that can effectively utilize wet coal slime. Utility model content:

[0005] The utility model aims to provide a thermal coal wet slime processing system to solve the problems raised in the above background technology.

[0006] The utility model is implemented by the following technical solutions:

[0007] A thermal coal wet slime processing system, comprising a hydrocyclone, an arc screen, a centrifuge, a buffer tank, a surface modification machine, a flotation feed tank, a first stage flotation machine, an ultra-high pressure filter press, a second stage flotation machine, a thickener and a slurry mixing tank;

[0008] The bottom flow port of the hydrocyclone is communicated with the feed port of the curved screen, the screen oversize discharge port of the curved screen is communicated with the feed port of the centrifuge, the overflow port of the hydrocyclone, the screen undersize outlet of the curved screen and the outlet of the centrifuge are respectively communicated with the buffer tank through pipelines, the buffer tank is fixedly arranged above the feed port of the surface modifier, the discharge port of the surface modifier is communicated with the flotation feed tank, the flotation feed tank is communicated with the feed port of the first stage flotation machine through a slurry pump, the foam outlet of the first stage flotation machine is communicated with the feed port of the ultra-high pressure filter press, the tailings discharge port of the first stage flotation machine is communicated with the feed port of the second stage flotation machine, the foam outlet of the second stage flotation machine is communicated with the feed port of the ultra-high pressure filter press, the tailings discharge port of the second stage flotation machine is communicated with the feed port of the thickener, and the discharge port of the thickener is communicated with the slurry mixing tank.

[0009] Preferably, an electric gate is installed at the bottom of the buffer box and is located just above the feed inlet of the surface modification machine.

[0010] Preferably, the overflow port of the ultra-high pressure filter press is connected to a circulating water system through a pipeline.

[0011] Preferably, the overflow port of the concentrator is connected to the circulating water system through a pipeline.

[0012] Preferably, a stirring device is provided in the slurry mixing tank.

[0013] The utility model has the following advantages: after the wet coal slime of thermal coal is processed by a hydrocyclone, an arc screen and a centrifuge, a coarse coal slime product can be obtained for reuse; the liquid separated by the hydrocyclone, the arc screen and the centrifuge can be subjected to conditioning, secondary flotation and filter pressing to obtain flotation clean coal, which can be mixed with fine clean coal for sale or directly sold alone; the filtrate of the filter press and the overflow of the concentrator are continuously used as subsequent circulating water, thereby reducing the waste of water resources; the flotation tailings are concentrated and driven into the slurry mixing pool in the gangue separation grouting system, and injected into the separation space above the underground goaf and below the main key layer by using the downhole filling technology, so that the wet coal slime is finally effectively utilized and the wet coal slime is not discharged. Description of the drawings:

[0014] Figure 1 This is a system connection diagram of the utility model.

[0015] In the figure: 1. hydrocyclone, 2. curved screen, 3. centrifuge, 4. buffer box, 5. surface modification machine, 6. flotation feed tank, 7. first stage flotation machine, 8. ultra-high pressure filter press, 9. second stage flotation machine, 10. thickener, 11. slurry mixing tank. Specific implementation method:

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1 The utility model provides a technical solution for a thermal coal wet slime processing system:

[0018] A thermal coal wet slime processing system comprises a hydrocyclone 1, an arc screen 2, a centrifuge 3, a buffer tank 4, a surface modification machine 5, a flotation feed tank 6, a first stage flotation machine 7, an ultra-high pressure filter press 8, a second stage flotation machine 9, a concentrator 10 and a slurry mixing tank 11;

[0019] The bottom flow port of the hydrocyclone 1 is connected to the feed port of the curved screen 2, the screen discharge port of the curved screen 2 is connected to the feed port of the centrifuge 3, the overflow port of the hydrocyclone 1, the screen outlet of the curved screen 2 and the outlet of the centrifuge 3 are connected to the buffer tank 4 through pipelines, and the buffer tank 4 is fixedly arranged above the feed port of the surface modification machine 5. The discharge port of the surface modification machine 5 is connected to the flotation feed tank 6, and the flotation feed tank 6 is connected to a slurry pump through a slurry pump. The feed port of the first stage flotation machine 7 is connected, the foam outlet of the first stage flotation machine 7 is connected with the feed port of the ultra-high pressure filter press 8, the tailings discharge port of the first stage flotation machine 7 is connected with the feed port of the second stage flotation machine 9, the foam outlet of the second stage flotation machine 9 is connected with the feed port of the ultra-high pressure filter press 8, the tailings discharge port of the second stage flotation machine 9 is connected with the feed port of the thickener 10, the discharge port of the thickener 10 is connected with the pulp mixing tank 11, and a stirring device is arranged in the pulp mixing tank 11.

[0020] An electric gate is installed at the bottom of the buffer box 4 and is located just above the feed inlet of the surface modification machine 5 .

[0021] The overflow port of the ultra-high pressure filter press 8 is connected to the circulating water system through a pipeline. The overflow port of the concentrator 10 is connected to the circulating water system through a pipeline, and the filter press filtrate and the concentrator overflow are continuously used as subsequent circulating water to reduce the waste of water resources.

[0022] The working principle is as follows: the wet coal slime from the thermal coal preparation plant is firstly subjected to classification treatment by the hydrocyclone 1, the underflow classified by the hydrocyclone 1 is screened by the curved screen 2, the screened material of the curved screen 2 enters the centrifuge 3 for further centrifugal dehydration, and the coarse coal slime product is obtained after dehydration.

[0023] At the same time, the overflow water of the hydrocyclone 1, the under-screen water of the curved screen 2 and the centrifugal liquid separated by the centrifuge 3 flow into the buffer tank 4 through pipelines respectively. By opening the electric gate at the bottom of the buffer tank 4, the liquid flows into the surface modifier 5. By adding flotation reagents into the surface modifier 5, under the action of the flotation reagents, some substances in the liquid are adsorbed on the surface by the reagents, the hydrophobicity difference between minerals is increased, the floatability of the minerals is improved, and the liquid in the surface modifier 5 is quickly flocculated and suspended. Then, the flocculated liquid in the surface modifier 5 is introduced into the flotation feed tank 6, and the flocculated liquid in the flotation feed tank 6 is sucked into a flotation machine 7 by a slurry pump for one flotation. Secondary flotation is carried out by the two-stage flotation machine 9, and the clean coal floated by the first-stage flotation machine 7 and the second-stage flotation machine 9 enters the ultra-high pressure filter press 8 for filter pressing and dehydration, and finally the floated clean coal is obtained by filter pressing, which can be mixed with fine clean coal for sale or sold directly alone. The tailings floated by the first-stage flotation machine 7 and the second-stage flotation machine 9 enter the concentrator 10 for concentration and dehydration, and the concentrated underflow is pumped into the slurry mixing tank 11 in the gangue separation grouting system, and is stirred by the stirring device on the slurry mixing tank 11 to make the underflow slurry more uniform, and the underflow slurry on the slurry mixing tank 11 is extracted by a slurry pump, and the underflow slurry is pumped into the coal mine for underground treatment, and is injected into the separation space above the underground goaf and below the main key layer by using the underground filling technology.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal coal wet slime processing system, characterized by: It comprises a hydrocyclone (1), an arc screen (2), a centrifuge (3), a buffer tank (4), a surface modification machine (5), a flotation feed tank (6), a first-stage flotation machine (7), an ultra-high pressure filter press (8), a second-stage flotation machine (9), a concentrator (10) and a slurry mixing tank (11); The bottom flow port of the hydrocyclone (1) is communicated with the feed port of the curved screen (2), the screen-surface material discharge port of the curved screen (2) is communicated with the feed port of the centrifuge (3), the overflow port of the hydrocyclone (1), the screen-underwater outlet of the curved screen (2) and the water outlet of the centrifuge (3) are respectively communicated with the buffer tank (4) through pipelines, the buffer tank (4) is fixedly arranged above the feed port of the surface modification machine (5), the discharge port of the surface modification machine (5) is communicated with the flotation feed tank (6), and the flotation feed tank (6) is connected to the surface modification machine (5). The over-slurry pump is connected to the feed port of the first-stage flotation machine (7), the foam outlet of the first-stage flotation machine (7) is connected to the feed port of the ultra-high pressure filter press (8), the tailings discharge port of the first-stage flotation machine (7) is connected to the feed port of the second-stage flotation machine (9), the foam outlet of the second-stage flotation machine (9) is connected to the feed port of the ultra-high pressure filter press (8), the tailings discharge port of the second-stage flotation machine (9) is connected to the feed port of the thickener (10), and the discharge port of the thickener (10) is connected to the slurry mixing tank (11).

2. A thermal coal wet slime processing system according to claim 1, characterized in that: An electric gate is installed at the bottom of the buffer box (4) and is located just above the feed inlet of the surface modification machine (5).

3. A thermal coal wet slime processing system according to claim 1, characterized in that: The overflow port of the ultra-high pressure filter press (8) is connected to the circulating water system through a pipeline.

4. A thermal coal wet slime processing system according to claim 1, characterized in that: The overflow port of the concentrator (10) is connected to the circulating water system through a pipeline.

5. A thermal coal wet slime processing system according to claim 1, characterized in that: A stirring device is arranged in the slurry mixing tank (11).

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