CN114226062A - Mixed separation process of coal and coal slime in particles below 2mm - Google Patents
Mixed separation process of coal and coal slime in particles below 2mm Download PDFInfo
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- CN114226062A CN114226062A CN202111599345.XA CN202111599345A CN114226062A CN 114226062 A CN114226062 A CN 114226062A CN 202111599345 A CN202111599345 A CN 202111599345A CN 114226062 A CN114226062 A CN 114226062A
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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
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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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 belongs to the technical field of coal preparation processes, and particularly discloses a mixed separation process of middlings and coal slime with particles below 2mm, which comprises the steps of primary crushing of a coal sample, screening, secondary crushing of oversize products, and continuous screening after the secondary crushing, wherein undersize products are sent into a classifying screen, more than 0.2mm of the undersize products are sent into a hydrocyclone for further classification, less than 0.2mm of the undersize products are sent into a flotation system for flotation, and finally raw materials in the coal sample are separated into products such as clean coal, middlings, coal slime, gangue and the like.
Description
Technical Field
The invention belongs to the technical field of coal preparation processes, and particularly relates to a mixed separation process of coal and coal slime in particles below 2 mm.
Background
The middling is a mixture of coal gangue and clean coal separated from raw coal, is a mixture between the clean coal and the gangue in raw coal washing, and the coal slime refers to a semisolid substance formed by coal dust containing water, is a product in a coal production process, is usually directly sold as low-quality coal due to the defects of high water-holding capacity and high viscosity, and causes waste of coal resources.
Disclosure of Invention
The invention aims to provide a mixed separation process of coal in particles with the particle size of less than 2mm and coal slurry, which separates a high-added-value part and a low-added-value part of the coal in raw materials and the coal slurry, can improve the yield of clean coal after the raw materials are subjected to washing, flotation and enables the clean coal generated by flotation to obtain high added value.
In order to achieve the purpose, the invention adopts the technical scheme that:
a mixed separation process of coal and coal slime in particles with the particle size of less than 2mm comprises the following steps:
(1) uniformly mixing coal slime and coal in particles in a ratio of 1:2, feeding the mixture into a crusher for primary crushing, separating the crushed mixture by a separation sieve of 2mm, feeding oversize products with the granularity larger than 2mm into a secondary crusher for continuous crushing, adding water into the crushed raw materials of the secondary crusher for mixing, then sieving by the separation sieve of 2mm, adding water into undersize products with the granularity smaller than 2mm for mixing to form suspension, and feeding the suspension into a classifying sieve of 0.2mm for continuous classification;
(2) adding water into oversize products of 2-0.2 mm classified by a 0.2mm classifying screen, then sending the oversize products into a multistage hydrocyclone for secondary classification, and sending undersize products with the particle size smaller than 0.2mm into a flotation system;
(3) the multistage hydrocyclone carries out the granularity classification of 0.2-0.3mm, 0.3-0.4mm, 0.4-0.5mm, 0.5-1mm, 1-1.5mm and 1.5-2mm on the incoming materials respectively, the 0.2-0.3mm, 0.3-0.4mm, 0.4-0.5mm, 0.5-1mm, 1-1.5mm and 1.5-2mm granularity ore pulp generated by classification respectively enters into the respective ore pulp barrel, then respectively enters into the hydraulic hydrocyclone under the action of the pump, and the bottom flow of the multistage hydrocyclone is sent into the flotation system;
(3) the overflow concentrate of each water medium cyclone enters a high-frequency clean coal sieve, the overflow concentrate is dehydrated to generate final clean coal, and the bottom flow of each water medium cyclone enters a medium gangue sieve;
(4) the screen hole of the medium gangue screen is 0.5mm, the oversize is medium gangue, and the undersize is mixed with the undersize of the 0.2mm classifying screen and then is jointly fed into a flotation system;
the raw material entering the flotation system is subjected to tertiary flotation of scavenging, roughing and concentrating to finally obtain the product clean coal, and the specific operation is as follows:
firstly, adding a collecting agent and a foaming agent into the coal entering a flotation system, carrying out three-stage scavenging, then, enabling the concentrate to enter a scavenging concentrate barrel, concentrating and settling the tailings, and carrying out filter pressing by a tailing filter press to obtain coal slime;
secondly, scavenging concentrate enters a roughing flotation machine, the roughed concentrate enters a roughing concentrate barrel, tailings enter a first collecting hopper, the overflow part of the first collecting hopper enters scavenging, bottom flow is discharged from the bottom of the collecting hopper to produce high-ash medium coal, and the high-ash medium coal is subjected to a medium coal filter press to obtain a high-ash medium coal product;
and thirdly, the rough concentration concentrate enters a fine concentration flotation machine, the fine concentration concentrate enters a fine concentration concentrate barrel to produce float clean coal through a clean coal filter press, tailings enter a second collecting hopper, overflow of the second collecting hopper enters rough concentration, underflow of the second collecting hopper discharges materials through the lower part of the collecting hopper to produce low-ash medium coal, and the low-ash medium coal is subjected to a medium coal filter press to obtain a low-ash medium coal product.
Further, the three-stage scavenging is realized by arranging a material bed which is gradually reduced in a stepped manner.
Further, the concentration of the suspension in the step (1) is 325g/l, the particle size distribution of coal in the particles after secondary crushing is 95% above 0.2mm, 85-90% below 0.2mm in coal slurry and 10-15% below 0.2-0.5 mm in coal slurry.
The invention has the advantages that:
1. the invention firstly crushes the particle middlings and the coal dust, and the middlings and the coal dust have different sizes, so that the mixture can be mixed during crushing to achieve the effect of cooperative separation, the defect of low crushing efficiency caused by small particle fineness of the coal dust can be overcome, the coal is separated from inorganic matters or pollutants to a certain degree, the selectivity can be changed to be easy-to-select coal or medium-sized coal, and then the crushed mixture is washed, so that the resource recovery rate is improved, and the economic benefit is obviously increased;
2. the crushed oversize products are subjected to secondary crushing, and the raw materials after the secondary crushing are separated again coarsely, so that the crushing closed circuit is realized, and the selectivity is fully improved; the method comprises the following steps of carrying out three-stage flotation (scavenging, roughing and fine selection) on crushed materials with the granularity smaller than 0.2mm, adopting three-stage scavenging in a scavenging link, greatly improving the yield of clean coal in the scavenging link by prolonging the scavenging duration and the height of a material bed, selecting clean coal and middlings, and carrying out coarse mixing of the clean coal, the middlings and the tailings, so that products are quickly dehydrated through a filter press, and the production efficiency is improved;
3. the method comprises the steps of classifying crushed middlings with the particle size of more than 0.2mm by adopting a multi-stage hydrocyclone, and then respectively entering the graded middlings with different particle sizes into a water medium hydrocyclone for further grading, so that clean coal, middlings and the like can be more accurately separated by adopting multi-stage separation, and the separation efficiency is effectively improved;
4. the process combines the flotation system and the cyclone classification system, thereby not only improving the yield of clean coal and leading the clean coal to be comprehensively recycled, but also reducing the environmental pollution and obtaining better social benefit; the utilization rate of coking coal resources is improved by improving the selectivity of middlings, so that the service life of the coking coal resources is prolonged, and the problem of resource exhaustion of coking coal in the future is solved.
Drawings
FIG. 1 is a flow chart of the process of crushing the mixture of middlings and coal slurry in the invention.
FIG. 2 is a flow chart of the washing process of the crushed coal sample in the invention.
Detailed Description
Examples
As shown in the figure, the process for mixing and selecting coal and coal slime in particles with the particle size of less than 2mm comprises the following steps:
(1) uniformly mixing coal slime and granular middlings in a ratio of 1:2, feeding the mixture into a crusher for primary crushing, separating the crushed mixture by a separation sieve of 2mm, feeding oversize products with the granularity larger than 2mm into a secondary crusher for continuous crushing, mixing the crushed raw materials by the secondary crusher with water, sieving the crushed raw materials by the separation sieve of 2mm again, crushing the granular middlings for the second time, adding water into the undersize products with the granularity smaller than 2mm for mixing to form a suspension, feeding the suspension with the concentration of 325g/l into a grading sieve of 0.2mm for continuous grading, wherein the oversize products with the granularity smaller than 0.2mm account for 85-90 percent and the undersize products with the granularity of 0.2-0.5 mm account for 10-15 percent, and the undersize products with the granularity smaller than 2mm are mixed and crushed to form a suspension, and the crushing efficiency is low when the granular middlings and the coal slime are mixed and crushed, when the two materials are mixed and crushed, collision crushing can be formed between different particle compositions, so that the crushing efficiency is greatly improved;
(2) adding water into oversize products of 2-0.2 mm classified by a 0.2mm classifying screen, then sending the oversize products into a multistage hydrocyclone for secondary classification, and sending undersize products with the particle size smaller than 0.2mm into a flotation system;
(3) the multistage hydrocyclone carries out the granularity classification of 0.2-0.3mm, 0.3-0.4mm, 0.4-0.5mm, 0.5-1mm, 1-1.5mm and 1.5-2mm on the incoming materials respectively, the 0.2-0.3mm, 0.3-0.4mm, 0.4-0.5mm, 0.5-1mm, 1-1.5mm and 1.5-2mm granularity ore pulp generated by classification respectively enters into the respective ore pulp barrel, then respectively enters into the hydraulic hydrocyclone under the action of the pump, and the bottom flow of the multistage hydrocyclone is sent into the flotation system;
(3) the overflow concentrate of each water medium cyclone enters a high-frequency clean coal sieve, the overflow concentrate is dehydrated to generate final clean coal, and the bottom flow of each water medium cyclone enters a medium gangue sieve;
(4) the screen hole of the medium gangue screen is 0.5mm, the oversize is medium gangue, and the undersize is mixed with the undersize of the 0.2mm classifying screen and then is jointly fed into a flotation system;
the raw material entering the flotation system is subjected to tertiary flotation of scavenging, roughing and concentrating to finally obtain the product clean coal, and the specific operation is as follows:
after a collecting agent and a foaming agent are added into coal entering a flotation system, three-stage scavenging is realized by arranging material beds which are gradually reduced in a stepped mode, specifically, the scavenging material beds are extended to three stages, and a height difference is arranged between each stage of material beds, so that the material containing clean coal on the upper surface of the scavenged material is supplemented when passing through each stage of material bed, the clean coal can be accurately supplemented after three times of supplementation and enters the next link, the concentrate enters a scavenging concentrate barrel, and tailings are subjected to concentration and sedimentation and then are subjected to pressure filtration by a tailing filter press to obtain coal slime;
secondly, scavenging concentrate enters a roughing flotation machine, the roughed concentrate enters a roughing concentrate barrel, tailings enter a first collecting hopper, the overflow part of the first collecting hopper enters scavenging, bottom flow is discharged from the bottom of the collecting hopper to produce high-ash medium coal, and the high-ash medium coal is subjected to a medium coal filter press to obtain a high-ash medium coal product;
and thirdly, the rough concentration concentrate enters a fine concentration flotation machine, the fine concentration concentrate enters a fine concentration concentrate barrel to produce float clean coal through a clean coal filter press, tailings enter a second collecting hopper, overflow of the second collecting hopper enters rough concentration, underflow of the second collecting hopper discharges materials through the lower part of the collecting hopper to produce low-ash medium coal, and the low-ash medium coal is subjected to a medium coal filter press to obtain a low-ash medium coal product.
Examples of the experiments
The results obtained for the practical operation according to the present invention are given in the following table:
laboratory for middling coal, slack coal and coal slime
Small sink-float experiment report
Claims (3)
1. A mixed separation process of coal and coal slime in particles with the particle size of less than 2mm is characterized by comprising the following steps:
(1) uniformly mixing coal slime and coal in particles in a ratio of 1:2, feeding the mixture into a crusher for primary crushing, separating the crushed mixture by a separation sieve of 2mm, feeding oversize products with the granularity larger than 2mm into a secondary crusher for continuous crushing, adding water into the crushed raw materials of the secondary crusher for mixing, then sieving by the separation sieve of 2mm, adding water into undersize products with the granularity smaller than 2mm for mixing to form suspension, and feeding the suspension into a classifying sieve of 0.2mm for continuous classification;
(2) adding water into oversize products of 2-0.2 mm classified by a 0.2mm classifying screen, then sending the oversize products into a multistage hydrocyclone for secondary classification, and sending undersize products with the particle size smaller than 0.2mm into a flotation system;
(3) the multistage hydrocyclone carries out the granularity classification of 0.2-0.3mm, 0.3-0.4mm, 0.4-0.5mm, 0.5-1mm, 1-1.5mm and 1.5-2mm on the incoming materials respectively, the 0.2-0.3mm, 0.3-0.4mm, 0.4-0.5mm, 0.5-1mm, 1-1.5mm and 1.5-2mm granularity ore pulp generated by classification respectively enters into the respective ore pulp barrel, then respectively enters into the hydraulic hydrocyclone under the action of the pump, and the bottom flow of the multistage hydrocyclone is sent into the flotation system;
(4) the overflow concentrate of each water medium cyclone enters a high-frequency clean coal sieve, the overflow concentrate is dehydrated to generate final clean coal, and the bottom flow of each water medium cyclone enters a medium gangue sieve;
(5) the screen hole of the medium gangue screen is 0.5mm, the oversize is medium gangue, and the undersize is mixed with the undersize of the 0.2mm classifying screen and then is jointly fed into a flotation system;
the raw material entering the flotation system is subjected to tertiary flotation of scavenging, roughing and concentrating to finally obtain the product clean coal, and the specific operation is as follows:
firstly, adding a collecting agent and a foaming agent into the coal entering a flotation system, carrying out three-stage scavenging, then, enabling the concentrate to enter a scavenging concentrate barrel, concentrating and settling the tailings, and carrying out filter pressing by a tailing filter press to obtain coal slime;
secondly, scavenging concentrate enters a roughing flotation machine, the roughed concentrate enters a roughing concentrate barrel, tailings enter a first collecting hopper, the overflow part of the first collecting hopper enters scavenging, bottom flow is discharged from the bottom of the collecting hopper to produce high-ash medium coal, and the high-ash medium coal is subjected to a medium coal filter press to obtain a high-ash medium coal product;
and thirdly, the rough concentration concentrate enters a fine concentration flotation machine, the fine concentration concentrate enters a fine concentration concentrate barrel to produce float clean coal through a clean coal filter press, tailings enter a second collecting hopper, overflow of the second collecting hopper enters rough concentration, underflow of the second collecting hopper discharges materials through the lower part of the collecting hopper to produce low-ash medium coal, and the low-ash medium coal is subjected to a medium coal filter press to obtain a low-ash medium coal product.
2. The process for mixing and separating coal and coal slime in particles with the particle size of less than 2mm as claimed in claim 1, which is characterized in that: the three-stage scavenging is realized by arranging a material bed which is gradually reduced in a stepped manner.
3. The process for mixing and separating coal and coal slurry in particles with the particle size of less than 2mm according to claim 2, wherein the process comprises the following steps: the concentration of the suspension in the step (1) is 325g/l, the particle size distribution of coal in the particles after secondary crushing is 95% above 0.2mm, 85-90% below 0.2mm in coal slime and 10-15% below 0.2-0.5 mm in coal slime.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110743696A (en) * | 2019-09-12 | 2020-02-04 | 安徽理工大学 | Recovery process of easy-to-separate coal slime flotation process |
| AU2020102453A4 (en) * | 2020-09-28 | 2020-11-12 | Shandong University Of Science And Technology | Efficient Deep Coal Slime Separation Process |
| CN112237984A (en) * | 2020-09-27 | 2021-01-19 | 中国平煤神马能源化工集团有限责任公司天成实业分公司 | Medium coal physical crushing dissociation re-washing process |
| US20210162427A1 (en) * | 2019-03-08 | 2021-06-03 | China University Of Mining And Technology | Underground coal separation process |
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- 2021-12-24 CN CN202111599345.XA patent/CN114226062A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210162427A1 (en) * | 2019-03-08 | 2021-06-03 | China University Of Mining And Technology | Underground coal separation process |
| CN110743696A (en) * | 2019-09-12 | 2020-02-04 | 安徽理工大学 | Recovery process of easy-to-separate coal slime flotation process |
| CN112237984A (en) * | 2020-09-27 | 2021-01-19 | 中国平煤神马能源化工集团有限责任公司天成实业分公司 | Medium coal physical crushing dissociation re-washing process |
| AU2020102453A4 (en) * | 2020-09-28 | 2020-11-12 | Shandong University Of Science And Technology | Efficient Deep Coal Slime Separation Process |
Non-Patent Citations (1)
| Title |
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| 郭敬;刘远望;: "浮选尾煤泥再分选回收工艺在霍州煤电集团的实践", 煤炭加工与综合利用, no. 09, pages 17 - 23 * |
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