CN111515018B - Coal slime grading and sorting process in coking coal separation plant - Google Patents
Coal slime grading and sorting process in coking coal separation plant Download PDFInfo
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- CN111515018B CN111515018B CN202010425796.0A CN202010425796A CN111515018B CN 111515018 B CN111515018 B CN 111515018B CN 202010425796 A CN202010425796 A CN 202010425796A CN 111515018 B CN111515018 B CN 111515018B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
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Abstract
The invention relates to a process flow for recovering low-ash clean coal from medium coal scumming screen drainage (hereinafter referred to as medium coal slime) in a coking coal preparation plant, in particular to a process for efficiently grading medium coal muddy water in the coking coal preparation plant through a fine screen slot arc screen and recovering low-ash clean coal through high-precision separation of a coal slime dense medium cyclone. The invention carries out coal dressing according to the following modes: the invention relates to a method for separating medium coal slime from fine coal slime, which comprises the steps of enabling medium coal slime to enter a fine sieve seam arc sieve with a sieve seam of 0.20mm for efficient classification, enabling undersize and oversize products to enter a second magnetic separator for medium removal and a coal slime dense medium cyclone for high-precision separation respectively, enabling clean coal dense medium split flow to serve as a separation medium of a super coal slime dense medium cyclone, enabling coal slime dense medium cyclone to overflow into a first magnetic separator, and enabling underflow to enter a second magnetic separator for medium removal treatment.
Description
Technical Field
The invention relates to the technical field of recovering low-ash clean coal from coal slime in coking coal, in particular to a grading and sorting process for the coal slime in a coking coal preparation plant.
Background
In recent years, by investigating the sorting and grading effects of a slime water system of a sorting coal plant, the problems that coarse slime grading efficiency is poor, the sorting effect is unstable, the slime water entering a flotation system contains ultra-coarse-particle coal (larger than 0.50mm) and the like due to limitation of the existing coal sorting process and equipment are generally found, particularly, the treatment process of the magnetic tail of the middling coal is not complete, and the magnetic tail of the middling coal contains part of clean coal with qualified quality due to factors such as coal quality change and process fluctuation of part of the coal sorting plant, so that the recovery of the low-ash clean coal in the middling slime is a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coal slime grading and sorting process in a coking coal preparation plant, which has simple process flow and effectively recovers low-ash clean coal of medium coal slime.
In order to realize the technical purpose, the invention adopts the following scheme: a coal slime grading and sorting process in a coking coal preparation plant comprises the following steps:
a. feeding the medium coal slime into a fine-slit arc sieve with a sieve slit of 0.2mm for classification to obtain oversize products and undersize products;
b. oversize products enter a coal slime qualified medium barrel, and undersize products enter a second magnetic separator for medium removal treatment;
c. shunting part of the qualified clean coal medium into a qualified coal slime medium barrel;
d. feeding ore pulp of the qualified coal slime medium barrel into a heavy medium cyclone for separation to obtain an underflow product and an overflow product;
e. the overflow product enters a first magnetic separator for separation, and the underflow product enters a second magnetic separator for separation;
f. and the concentrate of the first magnetic separator and the concentrate of the second magnetic separator respectively enter the raw coal qualified medium barrel, the tailings of the first magnetic separator enter a clean coal muddy water system for subsequent operation, and the tailings of the second magnetic separator enter a middling muddy water system for subsequent operation.
Compared with the prior art, the invention has the beneficial effects that: the medium coal slime grading and sorting process provided by the invention utilizes a 0.2mm fine-slit arc sieve, so that the grading efficiency is improved; the heavy medium cyclone device has small volume, high separation precision, low separation lower limit and high processing capacity; the fine-slit sieve and the dense-medium cyclone are used in combination, so that the low-ash clean coal in the medium coal slime is recovered to a clean coal muddy water system, the recovery rate of the low-ash clean coal is improved, and the economic benefit is increased.
Preferably, the 0.2mm fine-slit arc screen in the step a is a stainless steel screen surface, and the screening efficiency is more than 80%.
Preferably, the qualified clean coal medium in step c is magnetite powder with a fraction of < 0.045mm in an amount of > 90%.
Preferably, in the step d, the slurry in the qualified coal slurry medium barrel is fed into the heavy medium cyclone by using a coal slurry medium combining pump.
Drawings
FIG. 1 is a flow chart of a process for classifying and sorting middlings provided by an embodiment of the invention;
labeled as: 1-fine-slit sieve bend, 2-heavy medium cyclone, 3-coal slime qualified medium barrel, 4-qualified medium pump, 5-first magnetic separator and 6-second magnetic separator.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
As shown in FIG. 1, the coal slime grading and sorting process in the coking coal preparation plant provided by the invention comprises the following steps:
a. and feeding the medium coal slime into a fine-slit arc sieve 1 with a sieve slit of 0.2mm for classification to obtain oversize products and undersize products.
b. Oversize materials enter a coal slime qualified medium barrel 3, and undersize materials enter a second magnetic separator 6 for medium removal treatment.
c. And shunting part of the qualified clean coal medium into a qualified coal slime medium barrel 3.
d. And feeding the material in the qualified coal slime medium barrel 3 into the heavy medium cyclone 2 for separation to obtain an underflow product and an overflow product.
e. The overflow product enters a first magnetic separator 5 for separation, and the underflow product enters a second magnetic separator 6 for separation.
f. The concentrate of the first magnetic separator 5 and the concentrate of the second magnetic separator 6 respectively enter the raw coal qualified medium barrel, the tailings of the first magnetic separator 5 enter a clean coal muddy water system for subsequent operation, and the tailings of the second magnetic separator 6 enter a middling muddy water system for subsequent operation.
Preferably, the 0.2mm fine-slit arc-shaped screen 1 in the step a is a stainless steel screen surface, and the screening efficiency is more than 80%.
Preferably, the qualified clean coal medium in step c is magnetite powder with a particle size of less than 0.045mm and a content of more than 90%.
Preferably, in the step d, the coal slime medium combining pump 4 is used for feeding the material in the coal slime qualified medium barrel 3 into the heavy medium cyclone 2.
The middlings muddy water of the coking coal separation plant enters a fine-slit sieve bend 1 with a sieve gap of 0.20mm for high-efficiency classification, undersize products enter a second magnetic separator 6 for magnetic separation and medium removal treatment, and oversize products enter a coal slime qualified medium barrel 3. Clean coal medium combining and shunting in a main separation system is used as a separation medium of a super coal slime heavy medium cyclone 2, a part of the clean coal medium combining and shunting enters a coal slime qualified medium barrel 3, materials in the coal slime qualified medium barrel 3 enter the coal slime heavy medium cyclone 2 through a coal slime medium combining pump 4 to be subjected to high-precision separation, overflow and underflow enter a first magnetic separator 5 and a second magnetic separator 6 respectively to be subjected to magnetic separation and medium removal treatment, concentrate of the first magnetic separator 5 and concentrate of the second magnetic separator 6 are used as qualified media to return to the raw coal qualified medium barrel, tailings of the first magnetic separator 5 are treated according to a conventional clean coal slime separation and recovery process of coal slime water in a coking coal separation plant, and tailings of the second magnetic separator 6 are treated according to a conventional coal slime separation and recovery process of coal slime water in the coking coal separation plant.
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (4)
1. A coal slime grading and sorting process in a coking coal preparation plant is characterized by comprising the following steps:
a. feeding the medium coal slime into a fine-slit arc sieve with a sieve slit of 0.2mm for classification to obtain oversize products and undersize products;
b. oversize products enter a coal slime qualified medium barrel, and undersize products enter a second magnetic separator for medium removal treatment;
c. shunting part of the qualified clean coal medium into a qualified coal slime medium barrel;
d. feeding ore pulp of the qualified coal slime medium barrel into a heavy medium cyclone for separation to obtain an underflow product and an overflow product;
e. the overflow product enters a first magnetic separator for separation, and the underflow product enters a second magnetic separator for separation;
f. and the concentrate of the first magnetic separator and the concentrate of the second magnetic separator respectively enter the raw coal qualified medium barrel, the tailings of the first magnetic separator enter a clean coal muddy water system for subsequent operation, and the tailings of the second magnetic separator enter a middling muddy water system for subsequent operation.
2. The middling sludge classifying and sorting process according to claim 1, wherein the 0.2mm fine-slit sieve arcs in step a are stainless steel sieve surfaces, and the sieving efficiency is more than 80%.
3. The middlings sludge classification and separation process of claim 1, wherein the qualified clean coal media in step c is magnetite powder with a size fraction of < 0.045mm in an amount of > 90%.
4. The middling sludge classifying and sorting process according to claim 1, wherein in the step d, slurry in the qualified coal slurry barrel is fed into the heavy medium cyclone by a coal slurry mixing pump.
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| CN202010425796.0A CN111515018B (en) | 2020-05-19 | 2020-05-19 | Coal slime grading and sorting process in coking coal separation plant |
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| CN202010425796.0A CN111515018B (en) | 2020-05-19 | 2020-05-19 | Coal slime grading and sorting process in coking coal separation plant |
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| CN111515018B true CN111515018B (en) | 2021-09-28 |
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| CN112221698B (en) * | 2020-09-27 | 2022-07-26 | 神华神东煤炭集团有限责任公司 | Combined method for removing gangue from flotation tailing and recovering combustible body through carrier flotation |
| CN113262874B (en) * | 2021-05-12 | 2022-02-08 | 乌海市广源洗煤有限责任公司 | Coal re-extraction process in coking coal |
| CN113210125B (en) * | 2021-05-17 | 2023-05-09 | 鄂托克旗建元洗煤有限责任公司 | Method and system for re-washing heavy medium of partial middlings |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5794791A (en) * | 1987-11-30 | 1998-08-18 | Genesis Research Corporation | Coal cleaning process |
| CN103831164A (en) * | 2014-02-24 | 2014-06-04 | 太原理工大学 | Gravity-flotation joint separation technology for coking middlings |
| CN203635312U (en) * | 2013-11-28 | 2014-06-11 | 唐山森普工程设计有限公司 | Mineral tailings grading and separating recovery system for middings magnetic separator in dense medium coal preparation plant |
| CN109225611A (en) * | 2018-11-28 | 2019-01-18 | 中国矿业大学 | Tertiary industry product liquid-solid fluid bed separation coarse slime system and its technique |
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2020
- 2020-05-19 CN CN202010425796.0A patent/CN111515018B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5794791A (en) * | 1987-11-30 | 1998-08-18 | Genesis Research Corporation | Coal cleaning process |
| CN203635312U (en) * | 2013-11-28 | 2014-06-11 | 唐山森普工程设计有限公司 | Mineral tailings grading and separating recovery system for middings magnetic separator in dense medium coal preparation plant |
| CN103831164A (en) * | 2014-02-24 | 2014-06-04 | 太原理工大学 | Gravity-flotation joint separation technology for coking middlings |
| CN109225611A (en) * | 2018-11-28 | 2019-01-18 | 中国矿业大学 | Tertiary industry product liquid-solid fluid bed separation coarse slime system and its technique |
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