CN102764702A - Method for preparing fine water coal slurry by utilizing coal slime in coal preparation plant - Google Patents
Method for preparing fine water coal slurry by utilizing coal slime in coal preparation plant Download PDFInfo
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- CN102764702A CN102764702A CN2012102593093A CN201210259309A CN102764702A CN 102764702 A CN102764702 A CN 102764702A CN 2012102593093 A CN2012102593093 A CN 2012102593093A CN 201210259309 A CN201210259309 A CN 201210259309A CN 102764702 A CN102764702 A CN 102764702A
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Abstract
The invention relates to a method for preparing fine water coal slurry by utilizing coal slime in a coal preparation plant, solving the problems that a product bin can be easily blocked and unloading and quality accidents can be easily caused after washing cleaned coal is doped in the existing coal slime treatment. The method comprises the following steps of: a, firstly carrying out conventional floatation on the coal slime, and reselecting to further eliminate gangue after the coal slime at the density class of 1.8g/cm<3> is obtained; b, smashing the coal slime subjected to the floatation for 20min until average particle size is 7.26Mum; c, preparing the coal slime into water coal slurry with the concentration of 50g/l, and adding 120kg/t of flocculating agent No.2 for stirring and sorting, thus ultra-clean coal with yield of 82.06% and ash content of 1.94% is sorted; and d, adding naphthalene additive with the dosage of 1.0% to prepare the fine water coal slurry with the concentration of 56.15% and the viscosity of 980-1146mPa.s corresponding to shear rate of 100/s. With the adoption of the method disclosed by the invention, the ultra-clean coal with the ash content being lower than 3% is sorted, the fine water coal slurry with the concentration being about 57% and the viscosity being about 1000mPa.s is prepared; a coarse crushing link is eliminated, energy consumption is saved; the fine water coal slurry can be taken as a raw material for carbon materials such as a carbon electrode and activated carbon; sulphur content of the ultra-clean coal is reduced; and heavy oil, diesel oil and natural gas can be replaced.
Description
Technical field
The present invention relates to coal preparation plant's coal slime processing method, be specially the method that a kind of coal preparation plant coal slime prepares Coal Slurry.
Background technology
Coal slime is the byproduct of coal preparation plant, and the coal slime of present domestic thermal coal coal preparation plant is to sell through mixing in the clean fine coal after filter press or the pressing filter dehydration basically.But coal slime moisture is high, and ash content is high; After participating in the washing cleaned coal, moisture of cleaned coal is increased, reduce the caloric value of cleaned coal; Influence the quality and the sale of head coal product, coal slime is difficult to evenly mix washing cleaned coal, agglomerating being present in the washing cleaned coal; Cause the obstruction in product storehouse easily, it is serious to freeze the railway carriage phenomenon in the winter time, causes the accident of unloading and quality accident easily.
Summary of the invention
The present invention to cause the obstruction in product storehouse easily and is prone to cause the problem of unloading with quality accident after to participate in the washing cleaned coal when having the coal slime processing now in order solving, and provides a kind of coal preparation plant coal slime to prepare the method for Coal Slurry.
The present invention adopts following technical scheme to realize: coal preparation plant's coal slime prepares the method for Coal Slurry, adopts following steps: a, at first coal slime is carried out conventional flotation, obtains the cm less than 1.8g/
3After the coal slime of density level, spoil is further discharged in gravity treatment; B, the coal slime after the flotation is pulverized 20min, to particle mean size be 7.26 μ m; C, coal slime is configured to the black water of 50g/l, No. 2 flocculants that add 120kg/t stir sortings, sub-elect productive rate and be 82.06%, ash content is 1.94% ultra clean coal; D, to be added in an amount of 1.0% naphthalene be that additive makes that concentration is 56.15%, corresponding shearing rate 100 s
-1Viscosity be the Coal Slurry of 980-1146mPa.s.
The flotation of coal slime and the method for preparing Coal Slurry common process all commonly used are for those skilled in the art realize easily.
Coal sample is through after the ultra-fine grinding, and organic flammable body in the coal grain and embedding cloth inorganic mineral are therein effectively dissociated, but through after the ultra-fine grinding, granularity is very thin, has exceeded the particle size range of the effective sorting of conventional froth flotation, and sharpness of separation greatly reduces; The technology of floc sedimentation flotation is at first in the process ore pulp (being black water) of ultra-fine grinding, to add a certain amount of flocculant; Ore pulp to being added with flocculant carries out high shear forces; Make the microfine ultra clean coal that dissociates through ultra-fine grinding form the floc sedimentation that a dimensioning is arranged that conventional froth flotation can realize the precision sorting; It is selected to use conventional froth flotation to carry out repeatedly again, the high-quality water-coal-slurry raw material that has obtained to have the efficient physical chemical property.
The present invention has following beneficial effect: 1, from coal preparation plant's coal slime, sub-elect ash content and be lower than 3% ultra clean coal, and prepare the Coal Slurry about concentration about 57%, viscosity 1000mPa.s; 2, be crushed to micron order to coal, the inorganic mineral that just embedding is distributed in the coal dissociates out, and the granularity of coal slime itself is thinner, has saved the coarse crushing link, has saved energy consumption; 3, the ultra-clean pit ash is low especially, can be used as the raw material of carbon materialses such as carbon electrode, active carbon, replaces the in short supply and petroleum coke that quality descends day by day of the supply of material at present; 4, in the process to the coal slime ultra-fine grinding, pyrite also obtains dissociating more fully, and surperficial not oxidised, can well remove at assorting room, reduces the sulphur content of ultra clean coal; 5, Coal Slurry is owing to fine size, ash content are very low; So burning velocity is fast; Efficient is high, can improve combustion intensity, the residual few ash in burning back; Coal Slurry can replacement for heavy, diesel oil and natural gas, is used for middle-size and small-size fuel oil and gas fired-boiler, the central air-conditioning of various office building, large halls and guest houses and various ash content is required strict especially various Industrial Stoves (like glass furnace and metal smelting furnace).
The specific embodiment
Coal preparation plant's coal slime prepares the method for Coal Slurry, it is characterized in that: adopt following steps: a, at first coal slime carried out conventional flotation, obtain the cm less than 1.8g/
3After the coal slime of density level, spoil is further discharged in gravity treatment; B, the coal slime after the flotation is pulverized 20min, to particle mean size be 7.26 μ m; C, coal slime is configured to the black water of 50g/l, No. 2 flocculants that add 120kg/t stir sortings, sub-elect productive rate and be 82.06%, ash content is 1.94% ultra clean coal; D, to be added in an amount of 1.0% naphthalene be that additive makes that concentration is 56.15%, corresponding shearing rate 100 s
-1Viscosity be the Coal Slurry of 980-1146mPa.s.
In the practical implementation process, the coal sample that screening test is adopted is resulting less than 1.8g/cm through drifting along
3The material of density level part.When the ultra clean coal of industrialization sorting from now on, can adopt the method for gravity treatment to get rid of greater than 1.8g/cm
3Material is as the raw material of sorting ultra clean coal behind the spoil of density level.
Separation results under more different particle mean sizes under the equal cleans ash carries out curve fitting accumulation ash content and productive rate in the separation results of above-mentioned different grinding particle sizes, the clean coal yield during more same ash content 2.0%; Comparative result is visible, and along with the increase of the time of pulverizing, the particle mean size of coal sample reduces; Clean coal yield also increases, when the pulverizing time is 20min, when mean particle size D is 7.26 μ m; The clean coal yield maximum reaches 83.6%, further reduces grinding particle size, and clean coal yield descends; So follow-up screening test, mill is busy to fix on 20min, and mean particle size D is positioned at 7.26 μ m.
The screening test result is visible, when the flocculant consumption is 40kg/t, can sub-elect that productive rate reaches 42.31%, ash content reaches 0.98% ultra clean coal.Along with the flocculant consumption increases, ash content is lower than 2.05% clean coal yield increase.
Separation results under more different flocculant consumptions under the equal cleans ash carries out curve fitting accumulation ash content and productive rate in the separation results of above-mentioned different flocculant consumptions, the clean coal yield during more same ash content 1.5%; Comparative result is visible, and along with the increase of flocculant consumption, clean coal yield also increases; When the flocculant consumption is 240kg/t; The clean coal yield maximum reaches 66.0%, further increases the flocculant consumption, and clean coal yield descends on the contrary.
Claims (1)
1. coal preparation plant's coal slime prepares the method for Coal Slurry, it is characterized in that: adopt following steps: a, at first coal slime carried out conventional flotation, obtain the cm less than 1.8g/
3After the coal slime of density level, spoil is further discharged in gravity treatment; B, the coal slime after the flotation is pulverized 20min, to particle mean size be 7.26 μ m; C, coal slime is configured to the black water of 50g/l, No. 2 flocculants that add 120kg/t stir sortings, sub-elect productive rate and be 82.06%, ash content is 1.94% ultra clean coal; D, to be added in an amount of 1.0% naphthalene be that additive makes that concentration is 56.15%, corresponding shearing rate 100 s
-1Viscosity be the Coal Slurry of 980-1146mPa.s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728204A (en) * | 2016-03-22 | 2016-07-06 | 中国矿业大学 | Selective flocculation separation process for micro-fine particle coking coal |
| CN107626438A (en) * | 2017-10-24 | 2018-01-26 | 六盘水师范学院 | A kind of technique for preparing super clean coal using anthracite Physical |
| CN115058267A (en) * | 2022-07-27 | 2022-09-16 | 神华准能资源综合开发有限公司 | Coal water slurry concentration method and coal water slurry concentration device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728204A (en) * | 2016-03-22 | 2016-07-06 | 中国矿业大学 | Selective flocculation separation process for micro-fine particle coking coal |
| CN107626438A (en) * | 2017-10-24 | 2018-01-26 | 六盘水师范学院 | A kind of technique for preparing super clean coal using anthracite Physical |
| CN107626438B (en) * | 2017-10-24 | 2020-09-18 | 六盘水师范学院 | Process for preparing ultra-pure coal by physical method of anthracite |
| CN115058267A (en) * | 2022-07-27 | 2022-09-16 | 神华准能资源综合开发有限公司 | Coal water slurry concentration method and coal water slurry concentration device |
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Application publication date: 20121107 |