CN112024117B - Coal dressing method and coal dressing system capable of greatly reducing coal slime product yield - Google Patents
Coal dressing method and coal dressing system capable of greatly reducing coal slime product yield Download PDFInfo
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- CN112024117B CN112024117B CN202010860125.7A CN202010860125A CN112024117B CN 112024117 B CN112024117 B CN 112024117B CN 202010860125 A CN202010860125 A CN 202010860125A CN 112024117 B CN112024117 B CN 112024117B
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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
Abstract
The invention relates to a coal separation method and a coal separation system for greatly reducing the yield of coal slime products, which comprise the conventional aqueous medium coal separation method and a method for mixing and dehydrating the concentrated fine-grained coal slime water and main clean coal. The main clean coal is clean coal with a granularity larger than a certain granularity, the granularity ranges from 0.2 mm to 30mm, and the fine-grained slime water is slime water with a granularity smaller than a certain granularity, and the granularity ranges from 0.2 mm to 30 mm. The invention has the advantages of obviously reducing the yield of fine-grained coal slime, increasing the yield of clean coal products, increasing economic benefits and reducing the difficulty of product management, and is an economical and efficient coal separation method and a coal separation system in the existing coal separation industry.
Description
Technical Field
The invention relates to a coal separation method and a coal separation process, in particular to a coal separation method and a coal separation system for greatly reducing the yield of coal slime products.
Background
At present, water is used as a main medium in the sorting process, fine coal slime with the particle size of less than 0.3mm in raw coal is mainly subjected to filter-pressing dehydration recovery by a filter press after the raw coal enters the water, the fine coal slime after filter-pressing cannot be directly mixed into a refined coal product for sale due to large water content, cake shape and the like, and finally the fine coal slime can only be singly sold at low price or be treated as waste, the coal slime product has low value and is difficult to treat, so that the reduction of the output of the coal slime product is always the key direction of industrial research, for example, a coal slime centrifugal machine developed by an equipment manufacturer can be used for singly centrifugally dehydrating and recovering coal slime with the particle size of-0.5 mm by settling, the water content is low, the material process is loose, and for example, the coal slime after filter-pressing dehydration is dried in partial areas, the water content of the coal slime is reduced and the coal slime is formed into a loose state, however, these methods all have the problems of high cost, high investment and poor using effect.
The invention starts from the integral coal preparation process, recycles the fine-grained coal slime to the maximum extent by changing the traditional coal slime dehydration process link, and greatly reduces the yield of fine-grained coal slime products.
Disclosure of Invention
The invention aims to provide a coal separation method and a coal separation system for concentrating fine-grained slime water once or for multiple times, and then mixing the high-concentration fine-grained slime water with main clean coal and then dehydrating. The coal preparation method has the advantages of greatly reducing the yield of fine-grained coal slime products, improving the yield of clean coal products and lowering the operation cost. The method can be easily realized in the prior art, is favorable for being popularized and used in the pre-gangue discharge of a power coal preparation plant or a coking coal preparation plant, and is favorable for improving the economic benefit of the coal preparation plant.
The technical scheme of the invention is summarized as follows:
a coal dressing method for greatly reducing the yield of coal slime products includes such steps as separating out the main clean coal product, concentrating the fine-grained coal slime water to obtain high-concentration coal slime water, mixing it with the main clean coal product, and dewatering.
The coal dressing method greatly reduces the yield of the coal slime product, wherein the main clean coal can be clean coal with the granularity of more than 0.3mm or clean coal with the granularity of more than 0.2mm, and the granularity can be adjusted; the particle size of the clean coal can be within a certain range, such as 0.2mm-50mm, and the range can be adjusted.
The coal dressing method greatly reduces the yield of the coal slime product, wherein fine-grained coal slime water can be the coal slime water with the granularity of less than 0.3mm and can also be the coal slime water with the granularity of less than 0.2mm, and the granularity can be adjusted; the size of the coal slime water can be in a certain particle size range, such as 0.3mm-0.045mm, and the range can be adjusted.
The invention relates to a coal separation method for greatly reducing the yield of coal slime products, wherein the coal separation method by using an aqueous medium is a jigging coal separation method.
The invention discloses a coal separation method for greatly reducing the yield of coal slime products, wherein the aqueous medium coal separation method is a dense medium coal separation method.
The coal dressing method greatly reduces the yield of the coal slime product, wherein the concentration of fine-grained coal slime water can be one-time concentration and multiple-time concentration.
The coal dressing method greatly reduces the yield of the coal slime product, wherein the concentration of fine-grained coal slime water can be concentrated by a concentrator and a swirler.
The coal dressing method for greatly reducing the coal slime product yield is characterized in that concentrated high-concentration coal slime water and a main clean coal product are mixed together and then dehydrated, and the dehydration mode can be centrifugal dehydration or screening dehydration.
The invention also aims to provide a coal preparation system for greatly reducing the yield of coal slime products, which comprises the following process links:
a. Performing jigging separation on two products on raw coal, directly discharging gangue as a gangue product, and cleaning the coal to the next step;
b. introducing clean coal discharged by jigging separation into a screening link, wherein oversize products are main clean coal, and undersize products are fine-grained slime water;
c. c, concentrating the fine-grained slime water in the step b for the first time, and enabling the concentrated low-concentration overflow water to enter the next step;
d. sieving and dehydrating the high-concentration fine-grained slime water subjected to the primary concentration c, mixing oversize products with main clean coal, and returning screened water to the primary concentration c;
e. the low-concentration overflow water discharged from the primary concentration c enters a secondary concentration, the overflow water after the primary concentration enters a circulating tank to be used as circulating water, and the high-concentration underflow is mixed with main clean coal and oversize products;
f. mixing the oversize products subjected to primary concentration and pre-dehydration and the high-concentration underflow subjected to secondary concentration in the steps c, d and e with main clean coal, then dehydrating in a centrifugal dehydration link, wherein the dehydrated product is a final product, namely the washing and mixing coal, and the dehydrated centrifugate returns to the primary concentration link c for treatment;
g. the system is provided with a coal slime filter-pressing dehydration link, when high-concentration underflow is more, part of the high-concentration underflow in the step e can be shunted to the filter-pressing dehydration link, fine coal slime forms fine coal slime products after filter-pressing dehydration, and filtrate water enters a circulating pool;
h. The coal dressing system greatly reduces the yield of the coal slime product, wherein high-concentration underflow in the step e can be subjected to tertiary concentration, the concentrated high-concentration underflow is mixed with main clean coal, and overflow water is used as circulating water and enters a circulating pool or returns to the secondary concentration;
i. and (5) supplementing the lost water to the circulating pool.
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the invention has the advantages that:
when the amount of the coal slime of raw coal is small, fine-grained coal slime can be completely recycled when lump coal is gangue removed, so that a system does not produce coal slime products;
when the amount of the raw coal slime is large, the yield of fine-grained slime products can be greatly reduced;
the system is simple, the total investment is saved, the yield of clean coal products is increased, and the economic benefit is improved;
and the method and the process can be easily realized under the condition of the prior art.
In conclusion, the invention has the advantages that: the method and the system have the advantages of obviously reducing the yield of fine-grained coal slime, increasing the yield of clean coal products, increasing economic benefits and reducing the difficulty of product management, and are an economical and efficient coal separation method and a coal separation system in the existing coal separation industry.
Drawings
FIG. 1 shows a schematic view of a coal preparation system process flow with a greatly reduced coal slurry product yield.
In the figure, 1 raw coal, 2 gangue, 3 clean coal, 4 main clean coal, 5 fine-grained slime water, 6 low-concentration overflow water, 7 high-concentration fine-grained slime water, 8 undersize water, 9 oversize products, 10 overflow water, 11 high-concentration undersize water, 12 centrifugal liquid, 13 fine slime, 14 filtrate water, 15 gangue products, 16 washing mixed coal products, 17 fine slime products, 18 circulating pool, 19 high-concentration undersize 20 overflow water
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and examples.
The coal preparation method comprises the conventional aqueous medium coal preparation method and a method for mixing and dehydrating the concentrated fine-fraction coal slime water and main clean coal.
The coal dressing method greatly reduces the coal slime product yield, wherein the main clean coal can be clean coal with the granularity of more than 0.3mm or clean coal with the granularity of more than 0.2mm, and the granularity can be adjusted; the particle size of the clean coal can be within a certain range, such as 0.2mm-50mm, and the range can be adjusted;
the coal dressing method greatly reduces the yield of the coal slime product, wherein fine-grained coal slime water can be the coal slime water with the granularity of less than 0.3mm and can also be the coal slime water with the granularity of less than 0.2mm, and the granularity can be adjusted; the coal slime water with a certain particle size range, such as 0.3mm-0.045mm, can also be adjusted;
The invention relates to a coal dressing method for greatly reducing the yield of coal slime products, wherein the coal dressing method by using an aqueous medium is a jigging coal dressing method.
The invention relates to a coal dressing method for greatly reducing the yield of coal slime products, wherein the aqueous medium coal dressing method is a heavy medium coal dressing method.
The coal dressing method greatly reduces the yield of the coal slime product, wherein the concentration of fine-fraction coal slime water can be one-time concentration or multiple-time concentration.
The coal dressing method greatly reduces the yield of the coal slime product, wherein the concentration of fine-grained coal slime water can be concentrated by a concentrator and a swirler.
The invention relates to a coal dressing method for greatly reducing the yield of coal slime products, wherein concentrated high-concentration coal slime water and a main clean coal product are mixed together and then dehydrated, and the dehydration mode can be centrifugal dehydration and screening dehydration.
The technological process of the coal preparation system of the invention is detailed below with reference to the attached drawings:
FIG. 1 is a process flow diagram of a coal preparation system with greatly reduced coal slime product yield, the process flow including the following steps:
a. performing jigging separation on the raw coal 1 to obtain two products, directly discharging the waste rock 2 as a waste rock product 15, and conveying the clean coal 3 to the next step along with overflow water;
b. leading cleaned coal 3 discharged by jigging separation to a screening link, wherein oversize products are main cleaned coal 4, and undersize products are fine-grained slime water 5;
c. C, carrying out primary concentration on the fine-grained slime water 5 in the step b, and enabling the concentrated low-concentration overflow water 6 to enter the next step;
d. screening and pre-dehydrating the high-concentration fine-grained slime water 7 after the primary concentration c, mixing oversize products 9 with the main clean coal 4, and returning screened water 8 to the primary concentration c;
e. the low-concentration overflow water 6 discharged from the primary concentration c enters the secondary concentration, the overflow water 10 after the primary concentration enters the circulating tank 18 to be used as circulating water, and the high-concentration underflow 11 is mixed with the main clean coal 4 and the oversize product 9;
f. mixing the oversize product 9 subjected to primary concentration and pre-dehydration and the high-concentration underflow 11 subjected to secondary concentration in the steps c, d and e with the main clean coal 4, and then, entering a centrifugal dehydration link for dehydration, wherein the dehydrated product is a final product, namely a washed and mixed coal product 16, and the dehydrated centrifugal liquid 12 returns to the primary concentration link c for treatment;
g. the system is provided with a coal slime filter-pressing dehydration link, when the high-concentration underflow 11 is more, part of the high-concentration underflow 11 in the step e can be shunted to the filter-pressing dehydration link, the fine coal slime 13 after filter-pressing dehydration forms a fine coal slime product 17, and filtrate water 14 enters a circulating pool 18;
h. in the coal dressing system with greatly reduced coal slime product yield, the high-concentration underflow 11 in the step e can be subjected to tertiary concentration, the concentrated high-concentration underflow 19 is mixed with the main clean coal 4, and the overflow water 20 is used as circulating water to enter the circulating pool 18 or return to the secondary concentration e.
i. And (5) supplementing the lost water to the circulating pool.
The above-mentioned process steps, and the systems of transportation, circulation, water replenishment, detection, control, electrical, etc., which are not shown in the drawings, are conventional technologies and will not be described herein.
Based on the same principle and method, in the process step a, the jigger is changed into a three-product jigger, three products of gangue, middlings and clean coal are separated, the gangue and the middlings are directly discharged, and the clean coal enters the next link.
Based on the same principle and method, in the process step a, the jigger is changed into dense medium separation equipment, a medium circulating system is used for assisting in separating two products, namely gangue and clean coal, the gangue is directly discharged, and the clean coal enters the next link.
Based on the same principle and method, in the process step a, the jigger is changed into dense medium separation equipment, a medium circulating system is used for assisting in separating three products, namely gangue, middlings and clean coal, the gangue and the middlings are directly discharged, and the clean coal enters the next link.
Based on the same principle and method, in the process step e, the centrifugal dehydration link of 7 can be changed into sieving dehydration, and the aim of the invention can be achieved.
As described above, the coal dressing method and the coal dressing system which greatly reduce the yield of the coal slime product can achieve the effects of greatly reducing the yield of the coal slime product, increasing the yield of the clean coal product and improving the economic benefit, and are a more efficient and economic coal dressing method and process in the existing coal dressing industry.
Although a few examples are given above, it is within the scope of the present invention to provide one of ordinary skill in the art with certain modifications, improvements, substitutions, etc., or any combination thereof.
Claims (7)
1. Coal dressing method capable of greatly reducing yield of coal slime product，The method is characterized in that after a main clean coal product is separated out in the aqueous medium coal separation method, fine-grained coal slime water is concentrated into high-concentration coal slime water, the concentrated high-concentration coal slime water and the main clean coal product are mixed together and then dehydrated, wherein the main clean coal is clean coal with the granularity of 0.2-50mm, and the fine-grained coal slime water is coal slime with the granularity of 0.045-0.2 mm.
2. The coal preparation method for greatly reducing the yield of the coal slime product according to claim 1, wherein the aqueous medium coal preparation method is a jigging coal preparation method.
3. The coal preparation method for greatly reducing the yield of the coal slime product according to claim 1, wherein the aqueous medium coal preparation method is a dense medium coal preparation method.
4. The coal preparation method with greatly reduced coal slurry product yield according to claim 1, wherein the concentration of the fine fraction coal slurry water is one or more concentration.
5. The coal preparation method for greatly reducing the yield of the coal slurry product according to claim 1, wherein the concentration of the fine-fraction coal slurry water is performed by a thickener and a swirler.
6. The coal preparation method for greatly reducing the yield of the coal slurry product according to claim 1, wherein the concentrated high-concentration coal slurry water is mixed with the main clean coal product and then dehydrated, and the dehydration mode is centrifugal dehydration or screening dehydration.
7. A coal preparation system adopting the coal preparation method for greatly reducing the yield of the coal slurry product according to any one of claims 1 to 6, characterized by comprising the following process links:
a. performing jigging separation on two products on raw coal, directly discharging gangue, and conveying clean coal to the next step along with overflow water;
b. Guiding the clean coal overflow water discharged by the jigger into a screening link, wherein oversize products are main clean coal, and undersize products are fine-grained slime water;
c. conveying the fine-grained coal slime water in the step b into a concentration cyclone by a pump for primary concentration, and feeding the concentrated low-concentration overflow water into the next step;
d. screening and pre-dehydrating the concentrated high-concentration fine-grained slime water, mixing oversize products with main clean coal, and returning screened water to primary concentration;
e. the overflow water discharged by the primary concentration enters a concentrator for secondary concentration, the overflow water after the concentration enters a circulating tank to be used as circulating water, and underflow high-concentration fine-grained slime water is mixed with main clean coal;
f. c, mixing the oversize products subjected to primary concentration and pre-dehydration in the step d, the high-concentration fine-grained slime water subjected to secondary concentration and main clean coal, and then, dewatering in a centrifugal dewatering link, wherein the dewatered product is a final product, and returning the dewatered centrifugate to the primary concentration link for treatment;
g. the system is provided with a coal slime filter-pressing dehydration link, when the water content of the high-concentration fine-grained coal slime is larger, part of the underflow high-concentration fine-grained coal slime in the step d can be shunted to the filter-pressing dehydration link, and part of the underflow high-concentration fine-grained coal slime is mixed with main clean coal;
h. The coal preparation system greatly reduces the yield of the coal slime product, wherein the underflow high-concentration fine-grain coal slime water in the step d can be conveyed into a swirler by a pump for tertiary concentration, the concentrated high-concentration underflow is mixed with main clean coal, and overflow water is used as circulating water or returned to the secondary concentration;
i. supplementing the lost water to the circulating water pond.
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| US4133747A (en) * | 1976-10-14 | 1979-01-09 | Canadian Patents & Development Limited | Method for processing raw coal |
| CN101757974B (en) * | 2010-01-25 | 2013-01-16 | 淄博市王庄煤矿 | Grading method for recovering refined coal from coal slime |
| CN103240168B (en) * | 2013-05-08 | 2014-12-10 | 中国矿业大学 | Classifying, separating and dewatering method for high-ash-content difficultly-separated coal slime |
| CN109092547A (en) * | 2018-08-14 | 2018-12-28 | 中国恩菲工程技术有限公司 | Slime separation method and slime separation system |
| CN109718944B (en) * | 2019-03-08 | 2019-11-29 | 中国矿业大学 | A kind of aqueous medium underground coal preparation technique |
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