CN101757974B - Grading method for recovering refined coal from coal slime - Google Patents
Grading method for recovering refined coal from coal slime Download PDFInfo
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- CN101757974B CN101757974B CN 201010300674 CN201010300674A CN101757974B CN 101757974 B CN101757974 B CN 101757974B CN 201010300674 CN201010300674 CN 201010300674 CN 201010300674 A CN201010300674 A CN 201010300674A CN 101757974 B CN101757974 B CN 101757974B
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Abstract
The invention relates to a method for recovering refined coal from coal slime, in particular to a grading method for recovering the refined coal from the coal slime. The method has the technical key points that by using a spiral classifier and the principle that 'sedimentation velocity in the liquid is different due to different particle sizes and specific gravities' of solid particles, the method realizes the separation between relatively high ash component and relatively low ash component by gravity classification; and 25-35% of plus sieve low ash refined coal with larger particle size can be recovered from the relatively high ash component, and 30-40% of minus sieve high ash coal slime with smaller particle size can be removed from the relatively low ash component. Through twice classification, the aim of 'removing the relatively high ash component in the coal slime' can be achieved. The embodiment of the invention can be used for recovering the refined coal from the coal slime, thus achieving the aim of reducing the ash content of the refined coal and meeting the demand of the user.
Description
Technical field
The present invention relates to from coal slime, reclaim the method for cleaned coal, particularly utilize staging to reclaim the method for cleaned coal in the coal slime.
Background technology
As shown in Figure 1, the original technological process of production in coal washery is: the raw coal of underground mining is poured raw-fuel feeder into tippler after mine car promotes, feed the raw coal belt after raw coal bolting by feeder, oversize enters the raw coal conveyer picker through artificial selection, and the lump coal of selecting is with being transported to the raw coal ore storage bin behind the Product mix under crusher in crushing and the raw coal Vibration Screen; When coal washing was produced, raw coal fed belt transport to jigging machine by the feeder under the raw coal ore storage bin and sorts, and entered belt transport to storehouse, middle colliery after the middle coal of selecting and spoil mix; The cleaned coal that jigging machine is selected enters the A vibratory sieve and sieves, it is concentrated that undersize is squeezed into concentration tank with the A pump, concentrated overflow is used as recirculated water, concentrated underflow is squeezed into belt vacuum filter with pump and is filtered, after mixing with the underground north and south of product introduction cleaned coal belt on the A Vibration Screen, as head coal product, sells through underground thing, upper storehouse cleaned coal belt transport to product ore storage bin filtering product; When middle coal is produced, the middle coal in storehouse, middle colliery through in coal belt, underground north and south, underground thing, upper storehouse cleaned coal belt transport to the product ore storage bin as in coal sell.Underground north and south, underground thing, upper storehouse cleaned coal belt be both as the cleaned coal belt conveyor, again simultaneously as in the coal belt conveyor, therefore cleaned coal and middle coal can not be produced transmission simultaneously.
The problem that original technological process of production exists mainly contains: raw coal is through behind the jig concentration, and cleaned coal enters A bolting, and the coarse fraction product can be adjusted cleans ash by control jig concentration parameter and A Vibration Screen hole dimension on the sieve; The lower fine fraction product of sieve then by the A pump squeeze into concentration tank concentrated after underflow enter filter and filter to become and filter the coal slime product, original technological process of production fine fraction filters coal slime product ash content and can not adjust, and original head coal product is to sell as cleaned coal by coarse fraction product on the A Vibration Screen with after filtering the coal slime Product mix, therefore original head coal product ash content is difficult to adjust.When market changes, the user requires less than 10% the time cleans ash, and original technological process of production can not guarantee, market sale is limited, has a strong impact on the economic benefit of enterprise; Adjust cleans ash, the product that production production and marketing is satisfied the need becomes the task of top priority in mine for this reason.
Summary of the invention
The invention provides the technique that a kind of staging reclaims cleaned coal in the coal slime, purpose is by technological transformation, uses spiral classifier and high frequency shale shaker by proportion and how much stagings product to be carried out classification, removes relatively high grey component in the coal slime, reduces cleans ash; By Rational mixed coal, adjust cleans ash, adapt to the variation in market, reach the adjustable controlled purpose of head coal product.
The following technical scheme of the concrete employing of the present invention:
Staging reclaims the cleaned coal in the coal slime, comprise that raw coal isolates cleaned coal through jigging machine, cleaned coal is being isolated on the sieve coal slime under cleaned coal and the sieve behind the A vibrosieve, it is characterized in that, coal slime is squeezed into spiral classifier with pump under the A Vibration Screen, with two high frequency shale shaker screenings, the high frequency shale shaker oversize is delivered to head coal product ore storage bin as head coal product with A vibratory sieve oversize after belt mixes respectively for sand return and overflow after the spiral classifier classification; After mixing, the high frequency shale shaker undersize squeezes into concentration tank with pump concentrated, concentrated overflow is used as recirculated water, concentrated underflow stores in concentration tank, on the central coal during storehouse, is mixed with middle coal after squeezing into belt vacuum filter and filter with pump and is delivered to middle product of coal ore storage bin.
In the such scheme, because vacuum filter production is asynchronous with coal washing production, when the coal slime storage time was longer in the concentration tank, concentrated underflow pipeline might stop up.
For this reason, preferred scheme is: concentrated underflow is squeezed into belt vacuum filter with pump, filtering product with Belt Conveying to middle coal coal bunker.All the other are identical with such scheme.
When this scheme is had relatively high expectations to cleans ash as the user, can start vacuum filter with coal slime as head coal product and coal washing production synchronous operation; When the user requires when low cleans ash, can start filter with coal slime as in product of coal and coal washing production synchronous operation, the difficult obstruction of concentrated underflow pipeline.
Compare with existing technique, advantage of the present invention is: method of the present invention can remove relatively high grey component in the coal slime, reduces the ash content of cleaned coal, tool applicant test, and ash content can hang down about 2～5, has improved product quality.
Description of drawings
Fig. 1 is the production technological process of prior art.
The specific embodiment
Further describe the present invention below in conjunction with accompanying drawing.
Embodiment 1
Coal slime is squeezed into spiral classifier with the A pump under the A Vibration Screen, and through two high frequency shale shaker screenings, oversize is delivered to head coal product ore storage bin as head coal product with A vibratory sieve oversize after belt mixes respectively for sand return and overflow after the spiral classifier classification; Squeeze into concentration tank with pump after undersize mixes concentrated, concentrated overflow is used as recirculated water, and concentrated underflow stores in concentration tank, on the central coal during storehouse, is mixed with middle coal after squeezing into belt vacuum filter and filter with pump and is delivered to middle product of coal ore storage bin.
Embodiment 2
Coal slime is squeezed into spiral classifier with the A pump under the A Vibration Screen, and with two high frequency shale shaker screenings, oversize is delivered to head coal product ore storage bin as head coal product with A vibratory sieve oversize after belt mixes respectively for sand return and overflow after the spiral classifier classification; Squeeze into concentration tank with pump after undersize mixes concentrated, concentrated overflow is used as recirculated water, and concentrated underflow is squeezed into belt vacuum filter with pump and filtered, filtering product with Belt Conveying to middle coal coal bunker.When this scheme is had relatively high expectations to cleans ash as the user, can start vacuum filter with coal slime as head coal product and coal washing production synchronous operation; When the user requires when low cleans ash, can start filter with coal slime as in product of coal and coal washing production synchronous operation, the difficult obstruction of concentrated underflow pipeline.
Claims (2)
1. staging reclaims the cleaned coal in the coal slime, comprise that raw coal isolates cleaned coal through jigging, cleaned coal is being isolated on the sieve coal slime under cleaned coal and the sieve after the A bolting, it is characterized in that, the lower coal slime of sieve is squeezed into spiral classifier with pump, with two high frequency shale shaker screenings, the high frequency shale shaker oversize is delivered to head coal product ore storage bin as head coal product with A vibratory sieve oversize after belt mixes respectively for sand return and overflow after the spiral classifier classification; After mixing, the high frequency shale shaker undersize squeezes into concentration tank with pump concentrated, concentrated overflow is used as recirculated water, concentrated underflow stores in concentration tank, on the central coal during storehouse, is mixed with middle coal after squeezing into belt vacuum filter and filter with pump and is delivered to middle product of coal ore storage bin.
2. staging according to claim 1 reclaims the cleaned coal in the coal slime, it is characterized in that, concentrated underflow is squeezed into belt vacuum filter with pump and filtered, and filtering product is squeezed into middle coal coal bunker with belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010300674 CN101757974B (en) | 2010-01-25 | 2010-01-25 | Grading method for recovering refined coal from coal slime |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010300674 CN101757974B (en) | 2010-01-25 | 2010-01-25 | Grading method for recovering refined coal from coal slime |
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| CN101757974A CN101757974A (en) | 2010-06-30 |
| CN101757974B true CN101757974B (en) | 2013-01-16 |
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| CN 201010300674 Expired - Fee Related CN101757974B (en) | 2010-01-25 | 2010-01-25 | Grading method for recovering refined coal from coal slime |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228866B (en) * | 2011-04-18 | 2013-11-27 | 昆明理工大学 | Compound classification method and equipment for ground ore product |
| CN104848241A (en) * | 2015-04-08 | 2015-08-19 | 首钢京唐钢铁联合有限责任公司 | Coked ash recovery method |
| CN109718944B (en) * | 2019-03-08 | 2019-11-29 | 中国矿业大学 | A kind of aqueous medium underground coal preparation technique |
| CN112024117B (en) * | 2020-08-25 | 2022-07-19 | 金易通科技(北京)股份有限公司 | Coal dressing method and coal dressing system capable of greatly reducing coal slime product yield |
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Owner name: ZIBO WANGZHUANG COAL MINE CO., LTD. Free format text: FORMER NAME: ZIBO WANGZHUANG COAL MINE |
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Address after: 255400 No. 898, Linzi Avenue, Linzi District, Shandong, Zibo Patentee after: Zibo Wang Zhuang Coal Mine Co., Ltd. Address before: 255400 No. 898, Linzi Avenue, Linzi District, Shandong, Zibo Patentee before: Zibo Wangzhuang Coal Mine |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20180125 |
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| CF01 | Termination of patent right due to non-payment of annual fee |