CN110790469B - Process and device for improving pressure filtration performance of tail coal slime by coal gasification fine slag - Google Patents
Process and device for improving pressure filtration performance of tail coal slime by coal gasification fine slag Download PDFInfo
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- CN110790469B CN110790469B CN201911085546.0A CN201911085546A CN110790469B CN 110790469 B CN110790469 B CN 110790469B CN 201911085546 A CN201911085546 A CN 201911085546A CN 110790469 B CN110790469 B CN 110790469B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
Abstract
The invention discloses a process and a device for improving the pressure filtration performance of tailing slurry by coal gasification fine slag, and the process comprises the following steps: mixing the coal gasification fine slag and the tail coal slime pressure filtration filtrate to prepare coal gasification fine slag slurry; adding the coal gasification fine slag slurry into the tail coal slime pulp, and fully mixing; carrying out filter pressing and dehydration on the tailing slurry added with the coal gasification fine slag slurry; and (3) shunting part of the filtrate generated in the filter pressing to prepare the coal gasification fine slag slurry. Because the coal gasification fine slag particles contain a large number of pores, the particle surfaces are rough, and the hydrophobicity is obviously higher than that of the tail coal mud. Due to the properties of the coal gasification fine slag, a large number of new drainage channels are formed in the tail coal slime, and the water in the tail coal slime is favorably and quickly discharged, so that the pressure filtration performance of the tail coal slime is improved, and the pressure filtration efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of coal slime dehydration, and particularly relates to a process and a device for improving the filtering performance of tail coal slime by adding coal gasification fine slag.
Background
At present, in coal washing processing, fine coal slime is separated by a common flotation process, flotation tailings enter a thickener, and are dewatered by a filter press after being concentrated to form a tail coal slime product. Meanwhile, the filter pressing link is also an important link for realizing closed circulation of the coal slime water in the coal preparation plant. The content of micro-fine gangue minerals in the tail coal slime is high, and the potential of the particle surface zone is high, so that the treatment of a filter pressing link becomes more difficult. The low filter-pressing efficiency will inevitably cause the increase of the coal slime amount in the coal slime water system and worsen the production condition. In order to improve the filter pressing efficiency, flocculation/flocculant is added in the filter pressing link of many coal preparation plants to promote the fine particles to agglomerate into large floccules, thereby improving the filter pressing efficiency. However, the use of a large amount of the chemical can affect the quality of circulating water of a coal preparation plant and deteriorate production. Meanwhile, the production cost of enterprises is increased. Therefore, the method for improving the filtering performance of the tail coal slime by using the high-efficiency, low-cost and environment-friendly method has great significance for the production of coal preparation plants.
In the process of coal gasification, gasified slag of coal is discharged and can be divided into coarse slag and fine slag according to different discharge modes, wherein the coarse slag is residue discharged from the bottom of a gasification furnace, and the fine slag is waste which is carried by coal gasification gas and is subjected to wet-process deslagging and filtering. The carbon content of the gasified fine slag is relatively high, generally accounts for more than 15 percent of the total amount of the fine slag, even reaches 26 to 55 percent, can not be used for producing cement, concrete, bricks and tiles and other building materials, can not be used for paving, and is solid waste which is difficult to directly apply.
The coal gasification fine slag is greatly different from the coal ash of a boiler of a power plant and the coal slag directly combusted from coal in material composition and mineral structure. The fine coal gasification slag formed at high temperature and high pressure has a large number of pores and a coarse particle surface. And the higher carbon content leads the overall hydrophobicity of the coal gasification fine slag to be higher. The coal gasification fine slag is added into the tail coal slime, and the filtrate is more easily and quickly discharged from a drainage channel formed by the coal gasification fine slag, so that the coal slime filter pressing efficiency is improved, and the resource utilization of waste is realized.
Disclosure of Invention
The invention aims to provide a process and a device for improving the filter pressing performance of tailing slurry by coal gasification fine slag, so as to improve the filter pressing performance of the tailing slurry and improve the filter pressing efficiency of the tailing slurry.
In order to achieve the purpose, the invention adopts the technical scheme that:
a process for improving the pressure filtration performance of tail coal slime by coal gasification fine slag comprises the following steps:
(1) mixing the coal gasification fine slag and the tail coal slime pressure filtration filtrate to prepare coal gasification fine slag slurry;
(2) adding the coal gasification fine slag slurry obtained in the step (1) into the tail coal slime pulp, and fully mixing;
(3) performing filter pressing and dehydration on the tailing slurry added with the coal gasification fine slag slurry obtained in the step (2);
(4) and (4) shunting part of the filtrate generated in the filter pressing in the step (3) to prepare coal gasification fine slag slurry.
Preferably, in the step (1), the concentration of the coal gasification fine slag in the coal gasification fine slag slurry is 600-900 kg/m3。
Preferably, in the step (2), the tailing coal slurry is calculated by dry coal slurry, and the use amount of the coal gasification fine slag is as follows: 50-150 kg of coal gasification fine slag is added to each t of dry coal slime.
The utility model provides a device for realizing that above-mentioned coal gasification fine slag improves coal slime filter-pressing performance technology, includes concentrated machine, ore pulp agitator, pressure filter, rubber belt conveyor, coal gasification fine slag slurry agitator, wherein: the underflow port of the thickener is connected with the inlet of the ore pulp stirring barrel through a pipeline, and a slurry pump is arranged on the pipeline; the outlet of the ore pulp stirring barrel is connected with the inlet of the filter press through a pipeline, and the pipeline is provided with a feeding pump; the filtrate outlet of the filter press is connected with the inlet of the gasified fine slag slurry stirring barrel through a pipeline, and the filter cake outlet of the filter press is connected with a rubber belt conveyor; the outlet of the gasified fine slag slurry stirring barrel is connected with the outlet of the slurry pump through a pipeline, and a check valve and a flow valve are arranged on the pipeline.
The flow valve is used for adjusting the addition amount of the coal gasification fine slag.
The check valve is used for preventing tailing slurry from flowing back to the fine slag slurry stirring barrel for coal gasification when the slurry pump stops working.
The outlet position of the coal gasification fine slag slurry stirring barrel is higher than the slurry pump.
Has the advantages that: the process and the device can improve the pressure filtration performance of the tailing slurry and improve the pressure filtration efficiency of the tailing slurry. Compared with the prior art, the invention has the following advantages:
(1) the used coal gasification fine slag is an industrial waste, has low cost, and greatly reduces the production cost compared with the common chemical filter aid.
(2) The coal gasification fine slag has no influence on water quality, does not pollute circulating water of a coal preparation plant, and is beneficial to the stable operation of each production link.
Drawings
FIG. 1 is a flow diagram of a process of the present invention;
FIG. 2 is a schematic view of the apparatus of the present invention in connection therewith;
in fig. 2: 1-a thickener; 2-a slurry pump; 3-a pulp stirring barrel; 4-a feeding pump; 5, a filter press; 6-a belt conveyor; 7-stirring the coal gasification fine slag slurry in a stirring barrel; 8-a check valve; 9-flow valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in FIG. 1, the process for improving the pressure filtration performance of the tailing slurry by coal gasification fine slag comprises the following steps:
(1) the coal gasification fine slag and the tail coal slime pressure filtration filtrate are mixed to prepare coal gasification fine slag slurry, so that the coal gasification fine slag slurry has better fluidity, and the concentration of the coal gasification fine slag slurry is preferably 600-900 kg/m3I.e. 1m3The solid mass of the coal gasification fine slag in the slurry is 600-900 kg;
(2) the tail coal slurry is injected into the slurry stirring barrel through a bottom flow hole of the thickener by the slurry pump, negative pressure is formed at an outlet of the slurry pump when the slurry pump works, the coal gasification fine slag slurry is sucked into the tail coal slurry, and is further mixed in the subsequent slurry stirring barrel, the tail coal slurry is calculated by dry coal slurry, the addition amount of the coal gasification fine slag is preferably 50-150 kg/t, namely the coal gasification fine slag added in 1t of dry coal slurry has the mass of 50-150 kg;
(3) carrying out filter pressing and dehydration on the tailing slurry added with the gasified fine slag;
(4) and (4) shunting part of the filtrate generated by filter pressing and dehydration in the step (3) to prepare the coal gasification fine slag slurry.
Because the coal gasification fine slag contains a large number of pores in the particles, the surfaces of the particles are rough. And the higher carbon content leads the overall hydrophobic degree of the coal gasification fine slag to be obviously higher than that of the tail coal mud. Due to the properties of the coal gasification fine slag, the filtrate can be more easily and quickly discharged from a drainage channel formed by the coal gasification fine slag, so that the filter pressing performance of the tail coal mud is improved, and the filter pressing efficiency is improved.
As shown in fig. 2, the apparatus for implementing a process for improving filtration performance of tail coal slurry by coal gasification fine slag of the present invention comprises a thickener 1, a pulp stirring barrel 3, a filter press 5, a belt conveyor 6, and a coal gasification fine slag slurry stirring barrel 7, wherein: the underflow port of the thickener 1 is connected with the inlet of the ore pulp stirring barrel 3 through a pipeline, and a slurry pump 2 is arranged on the pipeline; the outlet of the ore pulp stirring barrel 3 is connected with the inlet of a filter press 5 through a pipeline, and the pipeline is provided with a feeding pump 4; a filtrate outlet of the filter press 5 is connected with an inlet of a gasification fine slag slurry stirring barrel 7 through a pipeline, and a filter cake outlet of the filter press 5 is connected with a rubber belt conveyor 6; the outlet of the gasified fine slag slurry stirring barrel 7 is connected with the outlet of the slurry pump 2 through a pipeline, and the pipeline is provided with a check valve 8 and a flow valve 9.
When the slurry pump 2 works, negative pressure is formed at the outlet to suck the coal gasification fine slag slurry into the tail coal slurry pulp, the flow valve 9 is used for adjusting the addition amount of the coal gasification fine slag, the check valve 8 is used for preventing the tail coal slurry from flowing back to the coal gasification fine slag slurry stirring barrel 7 when the slurry pump 2 stops working, and the outlet position of the coal gasification fine slag slurry stirring barrel 7 is higher than that of the slurry pump, so that the coal gasification fine slag slurry is easier to suck. The coal gasification fine slag and the tail coal slime are further stirred in a coal gasification fine slag slurry stirring barrel 7 to enable the mixture of the coal gasification fine slag and the tail coal slime to be more uniform, the tail coal slime slurry mixed with the coal gasification fine slag is subjected to filter pressing and dehydration through a filter press 5, a part of the removed filtrate is shunted and fed into the coal gasification fine slag slurry stirring barrel 7, and a filter cake formed after filter pressing is conveyed through a belt conveyor 6.
Example (b):
the laboratory filtration test is carried out on the underflow of the thickener with high content of certain fine mud, and the pulp concentration is 500kg/m3100mL of sample is taken, 100kg/t of coal gasification fine slag is added, after the mixture is fully stirred by an impeller stirrer, a Buchner funnel is used for carrying out suction filtration test, the test pressure is 0.1MPa, the test is stopped when no filtrate is discharged after 10 seconds of suction filtration, and the final filtration time is recorded as 8 minutes and 20 seconds. In the same timeUnder the test conditions, the coal gasification fine slag is not added, and the final filtration time is 13 minutes and 50 seconds. The coal gasification fine slag is added, so that the filtering time is reduced by 40 percent, and the filtering speed is obviously improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A process for improving the pressure filtration performance of tail coal slime by coal gasification fine slag is characterized in that: the method comprises the following steps:
(1) mixing the coal gasification fine slag and the tail coal slime pressure filtration filtrate to prepare coal gasification fine slag slurry; wherein the concentration of the coal gasification fine slag in the coal gasification fine slag slurry is 600-900 kg/m3；
(2) Adding the coal gasification fine slag slurry obtained in the step (1) into the tail coal slime pulp, and fully mixing; wherein, the tailing slurry is calculated by dry coal slurry, and the amount of the coal gasification fine slag is as follows: adding 50-150 kg of coal gasification fine slag into each t of dry coal slime;
(3) performing filter pressing and dehydration on the tailing slurry added with the coal gasification fine slag slurry obtained in the step (2);
(4) and (4) shunting part of the filtrate generated in the filter pressing in the step (3) to prepare coal gasification fine slag slurry.
2. An apparatus for implementing the process for improving the pressure filtration performance of the tailing slurry by coal gasification fine slag according to claim 1, which is characterized in that: including concentrated machine (1), ore pulp agitator (3), pressure filter (5), rubber belt conveyor (6), coal gasification fine slag slurry agitator (7), wherein: the underflow port of the thickener (1) is connected with the inlet of the ore pulp stirring barrel (3) through a pipeline, and a slurry pump (2) is arranged on the pipeline; the outlet of the ore pulp stirring barrel (3) is connected with the inlet of the filter press (5) through a pipeline, and the pipeline is provided with a feeding pump (4); a filtrate outlet of the filter press (5) is connected with an inlet of the coal gasification fine slag slurry stirring barrel (7) through a pipeline, and a filter cake outlet of the filter press (5) is connected with a rubber belt conveyor (6); the outlet of the coal gasification fine slag slurry stirring barrel (7) is connected with the outlet of the slurry pump (2) through a pipeline, and a check valve (8) and a flow valve (9) are arranged on the pipeline.
3. The apparatus of claim 2, wherein: the flow valve (9) is used for adjusting the addition amount of the coal gasification fine slag.
4. The apparatus of claim 2, wherein: the check valve (8) is used for preventing tailing slurry from reversely flowing back to the coal gasification fine slag slurry stirring barrel (7) when the slurry pump (2) stops working.
5. The apparatus of claim 2, wherein: the outlet position of the coal gasification fine slag slurry mixing barrel (7) is higher than the slurry pump (2).
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| CN113333436B (en) * | 2021-05-21 | 2022-04-08 | 中国矿业大学 | All-component comprehensive utilization method of coal gasification fine slag |
| CN114702218A (en) * | 2022-03-25 | 2022-07-05 | 徐州沃力能源科技有限公司 | Municipal sludge and gasified slag co-processing method |
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