CN101112696B - Sub-dense medium separation technics and sub-heavy-media separator - Google Patents
Sub-dense medium separation technics and sub-heavy-media separator Download PDFInfo
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- CN101112696B CN101112696B CN2007100625188A CN200710062518A CN101112696B CN 101112696 B CN101112696 B CN 101112696B CN 2007100625188 A CN2007100625188 A CN 2007100625188A CN 200710062518 A CN200710062518 A CN 200710062518A CN 101112696 B CN101112696 B CN 101112696B
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Abstract
The invention relates to a mild heavy-medium coal selection process and a mild heavy-medium selector, belonging to coal selection field. The process of the invention includes two parts: a fixed operation and a variable operation. The adopted selection medium is the mild heavy medium which is a coal slurry mixed by the coal powder less than 0.5 mm and the water; the coal selection steps are that: the raw material coal and the mild heavy medium are poured into a material mixing barrel and uniformly mixed, and is then poured into the mild heavy medium selector from the mixing barrel to be selected into a light outcome and a heavy outcome; the de-mediums of the two outcomes are respectively carried out by respective arc-typed sieve and vibration sieve, and the light products and heavy products are made; the removed medium is returned back into the medium-collecting barrel for backup. The process uses professional mild heavy medium selector, with the diameter of the cylinder body ranging from 150 mm to 1500 mm, the length of the cylinder ranging from 1.25 to 1.50 times of the diameter of the cylinder diameter, cone angles ranging from 75 DEG to 105 DEG and installation angle ranging from 0 DEG to 30 DEG. The invention is not provided with the coal slurry disposal system, with simplified process, not only can wash the easy selection coal, but also can wash the difficult selection coal, with high selection precision and low charge of all investments.
Description
Technical field
The present invention relates to a kind of coal preparation technology field, particularly relate to a kind of inferior dense medium coal cleaning process and inferior heavy-media separator.
Background technology
At present the coal preparation method greater than 0.5mm coal is mainly contained heavily Jie, jigging and dry separation three classes.
Heavily be situated between is to be the coal preparation method of medium with magnetite powder and water.Lower limit of separation can reach 0.5mm, sharpness of separation height (Ep ≈ about 0.04), and both optional easy coal separation also can be washed difficult separation coal, both has been used for coking coal coal preparation plant at present, also is used for thermal coal coal preparation plant.Medium system and slurry circulating system are all complicated, and the investment of founding the factory is higher, and equipment and pipeline wearing and tearing are heavier, and producing cost is also higher.
Jigging is that Yi Shui and wind are the coal preparation method of medium.Lower limit of separation can reach 0.5mm, and sharpness of separation moderate (Ep ≈ about 0.08) is fit to select easy coal separation, also can wash the coal of medium washability, but efficient is lower, is widely used in coking coal and thermal coal coal preparation plant.Slurry circulating system is complicated, and the investment of founding the factory is placed in the middle, and producing cost is placed in the middle.
Selection by winnowing is to be the coal preparation method of medium with wind.Lower limit of separation can reach 3 (6) mm, sharpness of separation relatively poor (Ep ≈ about 0.25), be applicable to the not high and coal slime of quality requirement (≤0.5mm) do not need the easy coal separation coal preparation plant of washing, now be used for power coal preparation plant.It does not need water, and system is simple, and the investment of founding the factory is low, and producing cost is also low.
Last century the fifties, Hungary once succeeded in developing Ha Erdekesi (Haldex) spoil powder medium cyclone, was used for reclaiming coal from spoil.Carried out the larger area popularization on West Europe and Poland and other places.
Last century the eighties, it is the DBZ cyclone of medium that Tangshan Subinst, Coal Science Research Central Inst is succeeded in developing with spoil powder and floating tail-coal, is used for reclaiming electric coal and therefrom reclaiming cleaned coal the coal from spoil.
Coal is the main energy sources of China, and mainly is thermal coal as the coal of the energy.For adapting to the needs of the national economic development, the mining inetesity of China's thermal coal progressively increases, and goes into to wash ratio and progressively enlarges.In the existing coal preparation method, the jigging and the sharpness of separation that heavily is situated between are higher, but it is also higher with producing cost to found the factory; Selection by winnowing is founded the factory lower with producing cost, but precision is relatively poor, can not satisfy the needs that high request power coal preparation plant builds.
Summary of the invention
The technical problem to be solved in the present invention is at jigging and the sorting that heavily is situated between is founded the factory and the producing cost height; The selection by winnowing precision is relatively poor, can not satisfy the deficiency that high request power coal preparation plant builds needs, one to provide a kind of be the separating medium of coal with inferior dense media, sharpness of separation is higher and found the factory and the low inferior dense medium coal cleaning process of producing cost, and two provide a kind of inferior heavy-media separator that is specifically designed to inferior heavy media coal separation.
Solve the problems of the technologies described above by the following technical solutions:
A kind of inferior dense medium coal cleaning process comprises fixed operation and variable operation two parts, and described fixed operation comprises: raw coal is prepared, mixing tank, and pump, separator, the light product sculping screen, heavy product de-media sieve closes the bucket that is situated between; Variable operation comprises: the vibratory sieve spray is situated between, and press filteration system is washed system again; It is characterized in that: the separating medium of described process using is inferior dense media, it is the coal slurry that mixes less than the coal dust of 0.5mm and water, quality 〉=300 grams of contained coal dust in every liter of coal slurry, and the quality of every liter of coal slurry is between the 1100-1300 gram, processing step with its coal separation is
1. ready feed coal is fed mixing tank, with pump inferior dense media is squeezed into mixing tank from closing the bucket that is situated between simultaneously, feed coal and inferior dense media are mixed;
2. by pump the medium and the feed coal that mix are squeezed into inferior heavy-media separator from tempering tank, be divided into two bursts of materials flows of light product and heavy product;
3. light product and heavy product become light product and heavy product respectively after separately camber sieve and vibratory sieve de-mediated, the medium that removes return close be situated between barrel multiplexing;
4. will add water and directly join to close and be situated between bucket or be sprayed onto dust suppression on the raw coal sizing screen, it is added the water yield and equals the poor of Total Water that Total Water that product takes away and feed coal bring into;
When 5. the slime content that carries when light, heavy product is less than the slime content of feed coal, in fixed operation, adds variable operation A-vibratory sieve spray and be situated between, qualified medium is sprayed onto on the vibration sculping screen of light product with pump, make light product once more mud; Once more the slime content that carries of the product behind the mud during still less than the slime content of feed coal, in fixed operation, add variable operation B-press filteration system again, reclaim the coal slime that coal slime regains with filter press and mix light product;
6. when the thin also desire of raw coal size raising sharpness of separation, in fixed operation, add variable operation C-and wash system again.When adopting inferior heavy-media separator to wash, the inferior heavy-media separator specification of variable operation C correspondence should suitably be dwindled again, and the sculping screen parameter should suitably be adjusted; When adopting flotation to wash again, add water and should vibrate the sculping screen water spray, rare Jie of generation and the pan feeding of the qualified medium of washing again stream merging as flotation as cleaned coal.
The inferior heavy-media separator that a kind of inferior dense medium coal cleaning process uses, it is by top cover, cylindrical shell, cone, underflow opening is formed by connecting, its feeding mouth is positioned at the side of cylindrical shell, overflow pipe is positioned at inner barrel, light product outlet is positioned on the top cover, it is characterized in that: described barrel diameter is 150-1500mm, cylindrical shell length is 1.25-1.50 barrel diameter doubly, the pan feeding bore is a 0.18-0.25 barrel diameter doubly, the overflow pipe bore is a 0.28-0.45 barrel diameter doubly, and the underflow bore is a 0.13-0.30 barrel diameter doubly, and cone angle is the 75-105 degree, setting angle is the 0-30 degree, and operating pressure is 0.07mpa-0.15mpa.
Adopt technique scheme, compared with prior art, the present invention does not have slurry circulating system, technology letter refining.Both easy coal separation can be washed, also difficult separation coal can be washed.The higher Ep ≈ 0.07 of sharpness of separation, lower limit of separation is 0.5mm.The construction investment of ton coal is low to be about 2.5 yuan of/ton raw coal, and the processing charges of ton coal are low to be about 2.5 yuan of/ton raw coal, and electrical energy consumption per tonne of raw coal is low to be about 2.5 degree/ton raw coal.Wash water is closed circuit, and is free from environmental pollution.
Description of drawings
Fig. 1 is the structural representation of the inferior heavy-media separator of the present invention.
Fig. 2 is the scheme of installation of inferior heavy-media separator.
Fig. 3 is the flow chart of the inferior dense medium coal cleaning process of the present invention.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Referring to Fig. 1, Fig. 2, inferior heavy-media separator is to use inferior dense media and structural parameters to be different from two product cyclones of other any kind cyclone, because of the density of coal dust is lower than iron powder, and its sharpness of separation is lower than heavy medium cyclone, so be referred to as inferior heavy-media separator (or autogenous medium cyclone).It is formed by connecting by top cover 1, cylindrical shell 4, cone 6, underflow opening 7.Feeding mouth 2 is positioned at the side of cylindrical shell 4, and overflow pipe 5 is positioned at cylindrical shell 4 inside, and light product outlet 3 is positioned on the top cover 1.The diameter of cylindrical shell 4 is 150-1500mm, the length of cylindrical shell 4 is 1.25-1.50 barrel diameter doubly, the pan feeding bore is a 0.18-0.25 barrel diameter doubly, the bore of overflow pipe 5 is a 0.28-0.45 barrel diameter doubly, the underflow bore is a 0.13-0.30 barrel diameter doubly, cone angle A is the 75-105 degree, and setting angle B is the 0-30 degree, and operating pressure is 0.07mpa-0.15mpa.
Its course of work is as follows:
Inferior dense media and coal are that the feeding mouth 2 of Di is squeezed in the inferior heavy-media separator by pump through equivalent diameter, because pan feeding speed is higher, coal and inferior dense media form in separator and rotatablely move, and highdensity spoil is subjected to bigger centrifugal force, quilt
Getting rid of behind wall, move downward along cone 6, is underflow opening 7 discharges of Du from diameter; The centrifugal force that low-density cleaned coal is subjected to is less, is brought to inferior heavy-media separator center, under the promotion of rising MEDIA FLOW, is overflow pipe 5 product outlet 3 discharges on the lenient side of Do through diameter.
Referring to accompanying drawing 3, inferior dense medium coal cleaning process is that the environment of inferior heavy-media separator work guarantees.It is that inferior heavy-media separator is created condition of work on the one hand, bears the subsequent treatment work of inferior heavy-media separator working result on the other hand.It is made up of fixed operation and variable operation two parts.Fixed operation comprises: raw coal is prepared, mixing tank, and inferior dense media separator, the light product sculping screen, heavy product de-media sieve closes the bucket that is situated between.Variable operation comprises: the vibratory sieve spray is situated between, and press filteration system is washed system again.Fixed operation is the operation that must occur in each flow process, and variable operation then is because of coal or because of the different operation of need, occurs sometimes in the flow process, does not occur sometimes, and all variable operations not necessarily occur simultaneously.Its processing step is:
1. ready feed coal is fed mixing tank, with pump inferior dense media is squeezed into mixing tank from closing the bucket that is situated between simultaneously, feed coal and inferior dense media are mixed;
2. by pump the medium and the feed coal that mix are squeezed into inferior heavy-media separator from tempering tank, be divided into two bursts of materials flows of light product and heavy product;
3. light product and heavy product become light product and heavy product respectively after separately camber sieve and vibratory sieve de-mediated, the inferior dense media that removes return close be situated between barrel multiplexing;
4. will add water and directly join to close and be situated between bucket or be sprayed onto dust suppression on the raw coal sizing screen, it is added the water yield and equals the poor of Total Water that Total Water that product takes away and feed coal bring into.
If the slime content that 5. light, heavy product carries during less than the slime content of feed coal, adds variable operation A-vibratory sieve spray and is situated between in fixed operation, with pump qualified medium is sprayed onto on the vibration sculping screen of light product, make light product once more mud; Once more the slime content that carries of the product behind the mud during still less than the slime content of feed coal, in fixed operation, add variable operation B-press filteration system again, reclaim coal slime with filter press, the coal slime of withdrawal is mixed light product.
When 6. if raw coal size improves sharpness of separation than thin and desire, in fixed operation, add variable operation C-and wash system again.When adopting inferior heavy-media separator to wash, the inferior heavy-media separator specification of variable operation C correspondence should suitably be dwindled again, and the sculping screen parameter should suitably be adjusted; When adopting flotation to wash again, add water and should vibrate the sculping screen water spray, rare Jie of generation and the pan feeding of the qualified medium of washing again stream merging as flotation as cleaned coal.
Claims (2)
1. an inferior dense medium coal cleaning process comprises fixed operation and variable operation two parts, and described fixed operation comprises: raw coal is prepared, mixing tank, and pump, separator, the light product sculping screen, heavy product de-media sieve closes the bucket that is situated between; Variable operation comprises: the vibratory sieve spray is situated between, and press filteration system is washed system again; It is characterized in that: the separating medium of described process using is inferior dense media, it is the coal slurry that mixes less than the coal dust of 0.5mm and water, quality 〉=300 grams of contained coal dust in every liter of coal slurry, and the quality of every liter of coal slurry is between the 1100-1300 gram, processing step with its coal separation is
1. ready feed coal is fed mixing tank, with pump inferior dense media is squeezed into mixing tank from closing the bucket that is situated between simultaneously, feed coal and inferior dense media are mixed;
2. by pump the medium and the feed coal that mix are squeezed into inferior heavy-media separator from tempering tank, be divided into two bursts of materials flows of light product and heavy product;
3. light product and heavy product become light product and heavy product respectively after separately camber sieve and vibratory sieve de-mediated, the medium that removes return close be situated between barrel multiplexing;
4. will add water and directly join to close and be situated between bucket or be sprayed onto dust suppression on the raw coal sizing screen, it is added the water yield and equals the poor of Total Water that Total Water that product takes away and feed coal bring into;
When 5. the slime content that carries when light, heavy product is less than the slime content of feed coal, in fixed operation, adds variable operation A-vibratory sieve spray and be situated between, qualified medium is sprayed onto on the vibration sculping screen of light product with pump, make light product once more mud; Once more the slime content that carries of the product behind the mud during still less than the slime content of feed coal, in fixed operation, add variable operation B-press filteration system again, reclaim coal slime with filter press, the coal slime of withdrawal is mixed light product;
6. when the thin also desire of raw coal size raising sharpness of separation, in fixed operation, add variable operation C-and wash system again, when adopting inferior heavy-media separator to wash, the inferior heavy-media separator specification of variable operation C correspondence should suitably be dwindled again, and the sculping screen parameter should suitably be adjusted; When adopting flotation to wash again, add water and should vibrate the sculping screen water spray, rare Jie of generation and the pan feeding of the qualified medium of washing again stream merging as flotation as cleaned coal.
2. inferior heavy-media separator that inferior dense medium coal cleaning process as claimed in claim 1 uses, it is by top cover, cylindrical shell, cone, underflow opening is formed by connecting, its feeding mouth is positioned at the side of cylindrical shell, overflow pipe is positioned at inner barrel, light product outlet is positioned on the top cover, it is characterized in that: described barrel diameter is 150-1500mm, cylindrical shell length is 1.25-1.50 barrel diameter doubly, the pan feeding bore is a 0.18-0.25 barrel diameter doubly, the overflow pipe bore is a 0.28-0.45 barrel diameter doubly, and the underflow bore is a 0.13-0.30 barrel diameter doubly, and cone angle is the 75-105 degree, setting angle is the 0-30 degree, and operating pressure is 0.07mpa-0.15mpa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100625188A CN101112696B (en) | 2007-08-03 | 2007-08-03 | Sub-dense medium separation technics and sub-heavy-media separator |
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| CN2007100625188A CN101112696B (en) | 2007-08-03 | 2007-08-03 | Sub-dense medium separation technics and sub-heavy-media separator |
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| CN101112696B true CN101112696B (en) | 2010-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103128011A (en) * | 2011-11-23 | 2013-06-05 | 煤炭科学研究总院唐山研究院 | Large cone angle dense medium cyclone |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489394A (en) * | 2011-11-30 | 2012-06-13 | 中国神华能源股份有限公司 | System and adding method for automatically adding dense medium suspension |
| CN102794227B (en) * | 2012-08-22 | 2015-12-09 | 山西晋城无烟煤矿业集团有限责任公司 | The lower dielectric film filter method of block spoil sieve and device |
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| CN2098969U (en) * | 1991-08-12 | 1992-03-18 | 邵阳煤矿机械厂 | Spiral coal classifier |
| CN2136697Y (en) * | 1992-09-27 | 1993-06-23 | 中国矿业大学 | Spiral drum classifier |
| US5819945A (en) * | 1995-08-31 | 1998-10-13 | University Of British Columbia | Bimodal dense medium for fine particles separation in a dense medium cyclone |
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2007
- 2007-08-03 CN CN2007100625188A patent/CN101112696B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364822A (en) * | 1981-04-13 | 1982-12-21 | Rich Jr John W | Autogenous heavy medium process and apparatus for separating coal from refuse |
| CN2098969U (en) * | 1991-08-12 | 1992-03-18 | 邵阳煤矿机械厂 | Spiral coal classifier |
| CN2136697Y (en) * | 1992-09-27 | 1993-06-23 | 中国矿业大学 | Spiral drum classifier |
| US5819945A (en) * | 1995-08-31 | 1998-10-13 | University Of British Columbia | Bimodal dense medium for fine particles separation in a dense medium cyclone |
Non-Patent Citations (4)
| Title |
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| 李国华，肖宏.自生介质选煤密度的稳定控制研究.煤矿现代化 2006年04期.2006,(2006年04期),41. |
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| 黄文锋，冉进财，彭耀丽，徐永生.自生介质旋流器分选细粒煤的探讨.煤炭加工与综合利用 1997年04期.1997,(1997年04期),17-18. |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103128011A (en) * | 2011-11-23 | 2013-06-05 | 煤炭科学研究总院唐山研究院 | Large cone angle dense medium cyclone |
| CN103128011B (en) * | 2011-11-23 | 2015-08-12 | 中煤科工集团唐山研究院有限公司 | Large cone angle heavy medium cyclone |
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