CN105132051A - Coal-water slurry and preparation method thereof - Google Patents
Coal-water slurry and preparation method thereof Download PDFInfo
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- CN105132051A CN105132051A CN201510604658.8A CN201510604658A CN105132051A CN 105132051 A CN105132051 A CN 105132051A CN 201510604658 A CN201510604658 A CN 201510604658A CN 105132051 A CN105132051 A CN 105132051A
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Abstract
The invention provides coal-water slurry and a preparation method thereof. The coal-water slurry comprises low-rank coal slurry A with the coal particle size smaller than or equal to 2.4 mm, low-rank coal slurry B with the coal particle size smaller than or equal to 0.5 mm and low-rank coal slurry C with the coal particle size smaller than or equal to 0.3 mm, wherein the mass ratio of the slurry A to the slurry B to the slurry C is (5-8):(1-3):(1-2); the particle size of 90% or above of coal particles in the low-rank coal slurry A is larger than or equal to 75 [mu]m; the particle size of 90% or above of coal particles in the low-rank coal slurry B is larger than or equal to 25 [mu]m and smaller than 50 [mu]m; the particle size of 90% or above of coal particles in the low-rank coal slurry C is larger than or equal to 5 [mu]m and smaller than 15 [mu]m. According to the invention, the low-rank coal slurry A, the low-rank coal slurry B and the low-rank coal slurry C are mixed through a multi-peak grading technology, and gaps formed by coal particle accumulation are perfectly filled with coal particles of different particle sizes, so that the stacking density is increased, the low-rank coal coal-water slurry with the concentration being 55% or above is obtained, and the problem that the low-rank coal slurry is hardly prepared into high-concentration coal-water slurry is solved well.
Description
Technical field
The invention belongs to coal water slurry preparation field, relate to a kind of coal water slurry and preparation method thereof, particularly relate to a kind of method utilizing multimodal grating technology to prepare coal water slurry, particularly a kind of method utilizing multimodal grating technology to be prepared high-concentration coal-water slurry by low-rank coal.
Background technology
China's energy structure has the feature of rich coal, oil-poor, weak breath, and coal accounts for 70% of China's energy expenditure, and in the time longer afterwards, coal will change as China's main energy sources.Although the coal reserves of China enriches, based on the low-rank coal that metamorphic grade is lower, and integrated distribution is on China's Development of Coal Chemical Industry area---the ground such as Shaanxi, the Inner Mongol, Xinjiang.Low-rank coal metamorphic grade is low, and internal moisture content is large, and hole is flourishing, and oxygen-containing functional group is many, and calorific value is low, belongs to difficult pulping coal.
The own characteristic of difficult pulping coal causes being difficult to be prepared into the coal water slurry meeting Coal Chemical Industry and burning needs.The mass concentration of coal water slurry directly affects its flammability and calorific value, and concentration is larger, and water content is less, more easily lights and calorific value is high, but mobility is deteriorated.From gasification and the angle of efficiency of combustion, the concentration of coal water slurry should be more high better, so how developing a kind of method that low-rank coal by difficult sludge forming performance prepares high-concentration coal-water slurry is problem demanding prompt solution in this area.
CN104449916A discloses warm upgrading in a kind of brown coal and prepares high-concentration coal-water slurry method, and described method comprises the depth drying of brown coal, the reaction of middle temperature, upgraded coal cooling and coal-grinding pulping process, and in being combined by depth drying, warm pyrolytic reaction is brown coal upgrading.Although this invention can obtain high-concentration coal-water slurry, during the method needs carry out at 600 DEG C-750 DEG C under normal pressure and inert gas environment, temperature reaction is to reach brown coal upgrading, temperature required higher.
CN104371779A discloses method and the system thereof that low-rank coal prepares high-concentration coal-water slurry, and described method comprises carries out the steps such as depth drying, pyrolysis, semicoke cooling, coal-grinding and pulping by low-rank coal.The method needs to carry out depth drying at 150 DEG C-200 DEG C, and needs to carry out pyrolysis at 400 DEG C-650 DEG C, and temperature required still higher, Measures compare is complicated.
In coal water slurry preparation field, grain size distribution is the gordian technique preparing high-concentration coal-water slurry, especially more important for difficult slurrying coal.Current China coal water slurry preparation technology is main mainly with the preparation technology of single grinding machine, and the granularity of coal slurry presents unimodal normal distribution, and difficult pulping coal cannot prepare high-concentration coal-water slurry.
Therefore, this area is needed a kind of multimodal grating technology that utilizes of exploitation badly and difficult pulping coal is prepared into the method for high-concentration coal-water slurry.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of coal water slurry and preparation method thereof, the method utilizes multimodal grating technology to achieve to prepare high-concentration coal-water slurry by low-rank coal, is filled with space when coal particle is piled up, improve deposition efficiency, thus improve the concentration of coal water slurry.
For reaching this goal of the invention, the present invention by the following technical solutions:
On the one hand, the invention provides a kind of coal water slurry, described coal water slurry comprises the low-rank coal slurry C of the low-rank coal slurry A of coal particle particle diameter≤2.4mm, the low-rank coal slurry B of coal particle particle diameter≤0.5mm and coal particle particle diameter≤0.3mm, and the mass ratio of described slurry A, slurry B and slurry C is 5 ~ 8:1 ~ 3:1 ~ 2;
Wherein, in described slurry A, the particle diameter of coal particle of more than 90% is more than or equal to 75 μm; In described slurry B, the particle diameter of coal particle of more than 90% is more than or equal to 25 μm and is less than or equal to 50 μm; In described slurry C, the particle diameter of coal particle of more than 90% is more than or equal to 5 μm and is less than or equal to 15 μm.
The present invention passes through by slurry A different for particle size range, slurry B together with slurry C mixture, thus the multimodal that can realize grain size distribution is filled, and decreases space when coal particle is piled up, improves deposition efficiency, thus improve the concentration of coal water slurry.
In coal water slurry of the present invention, coal particle particle diameter≤the 2.4mm of described slurry A, the coal particle particle diameter of such as slurry A can be less than or equal to 2.4mm, be less than or equal to 2mm, be less than or equal to 1.8mm, be less than or equal to 1.5mm, be less than or equal to 1mm, be less than or equal to 800 μm, be less than or equal to 700 μm, be less than or equal to 600 μm, be less than or equal to 500 μm, be less than or equal to 400 μm, be less than or equal to 300 μm, be less than or equal to 200 μm, be less than or equal to 100 μm etc., preferably, the coal particle particle diameter of described slurry A is 1 μm ~ 2.4mm, preferably 60 μm ~ 2.4mm, preferred 75 μm ~ 2.4mm further.In slurry A more than 90% such as 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, the particle diameter of the coal particle of 99% or 100% can for being more than or equal to 80 μm, be more than or equal to 90 μm, be more than or equal to 100 μm, be more than or equal to 120 μm, be more than or equal to 140 μm, be more than or equal to 150 μm, be more than or equal to 180 μm, be more than or equal to 200 μm, be more than or equal to 220 μm, be more than or equal to 260 μm, be more than or equal to 300 μm, be more than or equal to 400 μm, be more than or equal to 500 μm, be more than or equal to 600 μm, be more than or equal to 700 μm, be more than or equal to 800 μm, be more than or equal to 1000 μm, be more than or equal to 1300 μm, be more than or equal to 1500 μm, be more than or equal to 1800 μm or be more than or equal to 2000 μm etc.
In coal water slurry of the present invention, coal particle particle diameter≤the 0.5mm of described slurry B, the coal particle particle diameter of such as slurry B can for being less than or equal to 400 μm, be less than or equal to 350 μm, be less than or equal to 300 μm, be less than or equal to 250 μm, be less than or equal to 200 μm, be less than or equal to 150 μm, be less than or equal to 100 μm, be less than or equal to 75 μm or be less than or equal to 50 μm, preferably, the coal particle particle diameter of described slurry B is 1 μm ~ 0.5mm, preferably 25 μm ~ 0.5mm, preferably 25 μm ~ 250 μm further, further preferably 25 μm ~ 50 μm.In slurry B more than 90% such as 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, the particle diameter of the coal particle of 99% or 100% can for being more than or equal to 25 μm and being less than or equal to 50 μm, be more than or equal to 30 μm and be less than or equal to 50 μm, be more than or equal to 35 μm and be less than or equal to 50 μm, be more than or equal to 40 μm and be less than or equal to 50 μm, be more than or equal to 45 μm and be less than or equal to 50 μm, be more than or equal to 25 μm and be less than or equal to 45 μm, be more than or equal to 25 μm and be less than or equal to 40 μm etc.
In coal water slurry of the present invention, coal particle particle diameter≤the 0.3mm of described slurry C, the coal particle particle diameter of such as slurry C can for being less than or equal to 280 μm, be less than or equal to 250 μm, be less than or equal to 200 μm, be less than or equal to 180 μm, be less than or equal to 150 μm, be less than or equal to 100 μm, be less than or equal to 75 μm, be less than or equal to 50 μm or be less than or equal to 45 μm, preferably, the coal particle particle diameter of described slurry C is 1 μm ~ 0.3mm, preferably 1 μm ~ 200 μm, preferably 1 μm ~ 100 μm further, further preferably 5 μm ~ 15 μm.In slurry C more than 90% such as 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, the particle diameter of the coal particle of 99% or 100% can for being more than or equal to 5 μm and being less than or equal to 15 μm, be more than or equal to 7 μm and be less than or equal to 15 μm, be more than or equal to 8 μm and be less than or equal to 15 μm, be more than or equal to 9 μm and be less than or equal to 15 μm, be more than or equal to 10 μm and be less than or equal to 15 μm, be more than or equal to 11 μm and be less than or equal to 15 μm, be more than or equal to 5 μm and be less than or equal to 14 μm, be more than or equal to 5 μm and be less than or equal to 13 μm, be more than or equal to 5 μm and be less than or equal to 12 μm, be more than or equal to 5 μm and be less than or equal to 11 μm, be more than or equal to 5 μm and be less than or equal to 10 μm etc.
In the present invention, the mixing quality ratio of slurry A, slurry B and slurry C can be but be not limited to 5:1:1,5:1:2,5:2:1,5:2:2,5:3:1,5:3:2,6:1:1,6:2:1,6:3:1,6:2:2,6:3:2,7:1:1,7:2:1,7:3:1,7:1:2,7:2:2,7:3:2,8:1:1,8:2:1,8:3:1,8:1:2,8:2:2 or 8:3:2.
In coal water slurry of the present invention, described low-rank coal is selected from the combination of any one or at least two kinds in brown coal, long-flame coal, non-caking coal, weakly caking coal, described combination can for but be not limited to the combination of brown coal and long-flame coal, the combination of brown coal and non-caking coal, the combination of brown coal and weakly caking coal, the combination of long-flame coal and non-caking coal, the combination of long-flame coal and weakly caking coal, the combination of non-caking coal and weakly caking coal, brown coal and the combination of long-flame coal and non-caking coal, the combination etc. of above-mentioned four kinds of low-rank coal.
Preferably, the concentration of described coal water slurry is more than 55%, such as 58%, 60%, 63%, 65%, 67%, 69%, 70%, 72%, 75%, 78%, 80%, 83%, 85%, 88%, 90%, 93%, 95%, 98% etc., preferably 60 ~ 75%.
On the other hand, the invention provides the preparation method of the coal water slurry described in first aspect, described method is: be that raw material prepares described slurry A, slurry B and slurry C with low-rank coal, slurry A, slurry B and slurry C 5 ~ 8:1 in mass ratio ~ 3:1 ~ 2 are mixed, and after after pinching mixed, shearing treatment, coal water slurry product can be obtained.
The present invention adopts multimodal grating technology to prepare coal water slurry, different for particle size range three kinds of low-rank coal slurry A, B and C mixing are carried out obtained coal water slurry, the space of fully filling between variable grain granularity when piling up can be made, improve tap density, and then improve the concentration of coal water slurry, make the coal water slurry prepared can meet gasification and burn application demand.
The preparation method of coal water slurry of the present invention comprises the steps:
(1) raw material low-rank coal is broken, then roughly grind after mixing 3 ~ 5:5 ~ 7 in mass ratio with production water, obtain the first slurry;
(2) the first slurry is carried out dehydration upgrading, solids content control 70 ~ 90% material as slurry A, solids content control 5 ~ 25% material as the second slurry;
(3) by second pulp concentration dehydration, solids content control 1 ~ 5% material as the 3rd slurry, solids content control 35 ~ 65% material as the 4th slurry;
(4) carry out fine grinding after being mixed according to mass ratio 1 ~ 1.5:0 ~ 1 with production water by the 4th slurry, will be more than or equal to 50% and material is as slurry B after being less than the fine grinding of 100%, after being less than or equal to the fine grinding of 50%, material is as the 5th slurry;
(5) the 5th slip is carried out Ultrafine Grinding, as slurry C;
(6) slurry A, slurry B and slurry C 5 ~ 8:1 in mass ratio ~ 3:1 ~ 2 are mixed, after pinching mixed, shearing treatment, coal water slurry product can be obtained.
In the preparation method of coal water slurry of the present invention, raw material low-rank coal is crushed to particle diameter≤13mm in (1) by step.
In step (1), raw material after fragmentation is mixed 3 ~ 5:5 ~ 7 in mass ratio with production water, such as, can mix by following mass ratio: 3:5,3:6,3:7,4:5,4:6 (i.e. 2:3), 4:7,5:5 (i.e. 1:1), 5:6 or 5:7.
Preferably, coal particle particle diameter≤2.4mm in described first slurry of step (1), and in the first slurry, the particle diameter of coal particle of more than 20% is less than or equal to 75 μm.Such as, in the first slurry 20%, 22%, 25%, 28%, 30%, 32%, 34%, 36%, the coal particle particle diameter of 38% or 40% is less than or equal to 75 μm, be less than or equal to 65 μm, be less than or equal to 60 μm, be less than or equal to 55 μm, be less than or equal to 50 μm, be less than or equal to 45 μm, be less than or equal to 40 μm, be less than or equal to 35 μm, be less than or equal to 30 μm, be less than or equal to 25 μm, be less than or equal to 20 μm, be less than or equal to 15 μm or be less than or equal to 10 μm.
Preferably, step (1) described corase grind is wet-milling, and during grinding, solids content is 30 ~ 55%, such as 30%, 33%, 35%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52% or 55%.
Preferably, the temperature of step (1) described corase grind is 10 ~ 50 DEG C, such as 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C, 40 DEG C, 45 DEG C or 50 DEG C.
Preferably, the mode of rapid (1) described corase grind is ball milling, rod milling or Ball-stirring mill.
Preferably, the rotating speed of described ball milling is 15 ~ 40r/min, such as 15r/min, 18r/min, 20r/min, 22r/min, 25r/min, 28r/min, 30r/min, 32r/min, 34r/min, 36r/min, 38r/min or 40r/min.
Preferably, the rotating speed of described rod milling is 15 ~ 25r/min, such as 16r/min, 17r/min, 18r/min, 19r/min, 20r/min, 21r/min, 22r/min, 23r/min or 24r/min.
Preferably, the speed of described agitation grinding is 10 ~ 25m/s, such as 11m/s, 13m/s, 15m/s, 17m/s, 19m/s, 20m/s, 22m/s or 24m/s.
In the preparation method of coal water slurry of the present invention, the described dehydration upgrading of step (2) is mechanical force dehydration, is preferably centrifuge dehydration.
In step (2), solids content is controlled 70 ~ 90% material as slurry A, such as solids content can be controlled 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88% or 90% material as slurry A; Solids content is controlled 5 ~ 25% material as the second slurry, such as solids content can be controlled 5%, 8%, 10%, 12%, 15%, 17%, 19%, 20%, 22%, 23% or 25% material as the second slurry.
Preferably, coal particle particle diameter≤2.4mm in the described slurry A of step (2), and the particle diameter of the coal particle of more than 90% is more than or equal to 75 μm.
Preferably, coal particle particle diameter≤0.5mm in described second slurry of step (2), and in the second slurry, the particle diameter of coal particle of more than 80% is less than 75 μm.
Preferably, in the described slurry A of step (2), in the quality of dry coal and the second slurry, the mass ratio of dry coal is 6 ~ 9:1 ~ 4, such as 6:1,6:2 (i.e. 3:1), 6:3 (i.e. 2:1), 6:4 (i.e. 3:2), 7:1,7:2,7:3,7:4,8:1,8:2,8:3,9:1,9:2 or 9:4.
In step (3), solids content is controlled 1 ~ 5% material as the 3rd slurry, such as solids content can be controlled 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5% material as the 3rd slurry; Solids content is controlled 35 ~ 65% material as the 4th slurry, such as solids content can be controlled 35%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 53%, 55%, 58%, 60%, 61%, 62%, 63%, 64% or 65% material as the 4th slurry.
Preferably, described 3rd slurry of step (3) uses as production water cycle.
Preferably, coal particle particle diameter≤0.5mm in described 4th slurry of step (3), and in the 4th slurry, the particle diameter of coal particle of more than 80% is less than 75 μm.Such as, be less than or equal to 400 μm, be less than or equal to 350 μm, be less than or equal to 300 μm, be less than or equal to 250 μm, be less than or equal to 200 μm, be less than or equal to 150 μm, be less than or equal to 100 μm or, be less than or equal to 75 μm, or be less than or equal to 50 μm, preferably, the coal particle particle diameter of described slurry B is 1 μm ~ 0.5mm, preferably 25 μm ~ 0.5mm, preferably 25 μm ~ 250 μm further, further preferably 25 μm ~ 50 μm; And the particle diameter of more than 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98% or 99% is less than 75 μm, 60 μm, 65 μm, 55 μm, 50 μm, 45 μm, 40 μm, 35 μm or 30 μm in the 4th slurry.
In step (4), fine grinding is carried out after being mixed according to mass ratio 1 ~ 1.5:0 ~ 1 with production water by 4th slurry, such as, the 4th slurry can mix according to following mass ratio with production water: 1:1,1:0.1,1:0.3,1:0.5,1:0.7,1:0.8,1:0.9,1.2:1,1.2:0.1,1.5:0.4,1.3:0.7 or 1.4:0.5 etc.
In step (4), material after fine grinding is divided into two groups, be more than or equal to 50% and material, such as can using 50% of material after fine grinding, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 92%, 94%, 96%, 98% or 99% as slurry B as slurry B after being less than the fine grinding of 100%; After remaining fine grinding, material is as the 5th slurry, such as can using material after the fine grinding of 50%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, 8%, 6%, 4%, 2% or 1% as the 5th slurry.
Preferably, coal particle particle diameter≤0.5mm in the described slurry B of step (4), and the particle diameter of the coal particle of more than 90% is more than or equal to 25 μm and is less than or equal to 50 μm.
Preferably, coal particle particle diameter≤0.3mm in step (5) described slurry C, and the particle diameter of the coal particle of more than 90% is more than or equal to 5 μm and is less than or equal to 15 μm.
In step (6), the mixing quality ratio of slurry A, slurry B and slurry C can be but be not limited to 5:1:1,5:1:2,5:2:1,5:2:2,5:3:1,5:3:2,6:1:1,6:2:1,6:3:1,6:2:2,6:3:2,7:1:1,7:2:1,7:3:1,7:1:2,7:2:2,7:3:2,8:1:1,8:2:1,8:3:1,8:1:2,8:2:2 or 8:3:2.
Preferably, the shearing rate of step (6) described shearing treatment is 50 ~ 120r/min, such as 50r/min, 60r/min, 70r/min, 80r/min, 90r/min, 100r/min, 110r/min or 120r/min.
Preferably, pinch described in step (4) described fine grinding, step (5) described Ultrafine Grinding and step (6) in mixed, shearing treatment process and add additive, the add-on of described additive is 0.1 ~ 1% of dry coal quality in corresponding slurry, such as 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1%.
Preferably, described additive is the combination of any one or at least two kinds in sulfonated lignin, humate and naphthalene sulfonic acidformaldehyde condensation product, such as, is combined as the combination of sulfonated lignin and humate, the combination of humate and naphthalene sulfonic acidformaldehyde condensation product, sulfonated lignin and the combination of naphthalene sulfonic acidformaldehyde condensation product and the combination of sulfonated lignin and humate and naphthalene sulfonic acidformaldehyde condensation product described in.
In preparation coal water slurry process, additive can play the surface properties changing coal particle, improves the effect of its degree of scatter in water, makes coal water slurry have good rheological characteristics and stability.
In the preparation method of coal water slurry of the present invention, described production water is clear water, the non-corrosiveness waste water that produces in the 3rd slurry or Chemical Manufacture.The present invention can save the consumption of water, and production water used can for the waste water produced in various Chemical Manufacture, the technique equipment used of losing capital as long as this waste water is stale-proof.
As the preferred technical solution of the present invention, the preparation method of coal water slurry of the present invention comprises the following steps:
(1) raw material low-rank coal is crushed to particle diameter≤13mm, then roughly grind at temperature is 10 ~ 50 DEG C after mixing 3 ~ 5:5 ~ 7 in mass ratio with production water, obtain the first slurry, coal particle particle diameter≤2.4mm in described first slurry, and in the first slurry, the particle diameter of coal particle of more than 20% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 70 ~ 90% material as slurry A, solids content control 5 ~ 25% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of the coal particle of more than 90% is more than or equal to 75 μm, coal particle particle diameter≤0.5mm in described second slurry, and the particle diameter of the coal particle of more than 80% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 1 ~ 5% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 35 ~ 65% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1 ~ 1.5:0 ~ 1 with production water, be incorporated as the additive of 0.1 ~ 1% of dry coal quality in the 4th slurry, carry out fine grinding, to 50% be more than or equal to and after being less than the fine grinding of 100% material as slurry B, after being less than or equal to the fine grinding of 50%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in described slurry B, and the particle diameter of the coal particle of more than 90% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive of 0.1 ~ 1% of dry coal quality in the 5th slurry is incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in described slurry C, and the particle diameter of the coal particle of more than 90% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) slurry A, slurry B and slurry C 5 ~ 8:1 in mass ratio ~ 3:1 ~ 2 are mixed to get mixed slurry, are incorporated as the additive of 0.1 ~ 1% of dry coal quality in mixed slurry, after pinching mixed, shearing treatment, coal water slurry product can be obtained.
In the preparation process of coal water slurry of the present invention, the water with a small amount of coal of generation can use as production water cycle, does not produce the waste water of outer row, environmental friendliness, is suitable for industrial production.
Relative to prior art, the present invention has following beneficial effect:
The present invention utilizes multimodal grating technology low-rank coal slurry A, B and C of different-grain diameter scope to be mixed, prepare coal water slurry, make the coal particle of different-grain diameter can more ideally fill coal particle pile up time space, improve tap density, thus improve the concentration of coal water slurry, obtain the low-rank coal coal water slurry of concentration more than 55%, solve the problem being difficult to low-rank coal is prepared into high-concentration coal-water slurry well, make the coal water slurry obtained can meet gasification and burn application demand.And the present invention have coal applied widely, can continuous seepage be realized, parameter adjustment is convenient, and the water produced in process of production can recycle, and does not produce efflux wastewater, environmentally friendly.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the embodiment of the present invention 1.
Embodiment
Technical scheme of the present invention is further illustrated below by embodiment.Those skilled in the art should understand, described embodiment is only help to understand the present invention, should not be considered as concrete restriction of the present invention.
embodiment 1
In the present embodiment, coal water slurry is prepared by brown coal, the brown coal adopted are colliery, Dongming, Hailar Area, Inner Mongol brown coal, in this coal, a point bleed is 21.8%, full water is 34.5%, and ash content is 8.5%, and particle diameter is less than 50mm, the technical process preparing the method for coal water slurry as shown in Figure 1, specifically comprises the following steps:
(1) by raw material crushing to particle diameter≤13mm, then with production water in mass ratio 4:6 roughly grind at temperature is 30 DEG C after mixing, obtain the first slurry, coal particle particle diameter≤2.4mm in the first slurry, and in the first slurry, the particle diameter of coal particle of 33% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 70% material as slurry A, solids content control 12.5% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of coal particle of 92% is more than or equal to 75 μm in slurry A, coal particle particle diameter≤0.5mm in described second slurry, and in the second slurry, the particle diameter of coal particle of 85% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 2.6% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 55% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1:0.4 with production water, be incorporated as the additive sulfonated lignin of 1% of dry coal quality in the 4th slurry, carry out fine grinding, using material after the fine grinding of 55% as slurry B, after the fine grinding of 45%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in described slurry B, and the particle diameter of the coal particle of 93% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive sulfonated lignin of 0.5% of dry coal quality in the 5th slurry are incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in slurry C, and the particle diameter of the coal particle of 93% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) by slurry A, slurry B and slurry C in mass ratio 7:1.5:1.5 be mixed to get mixed slurry, be incorporated as the additive sulfonated lignin of 0.1% of dry coal quality in mixed slurry, through pinch mixed, shear (100r/min) process after, the coal water slurry product that concentration is 58% can be obtained, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 2
In the present embodiment, prepare coal water slurry by the long-flame coal of Yili of Xinjiang, in this coal, a point bleed is 12.7%, and full water is 21.9%, and ash content is 10.4%, and particle diameter is less than 50mm; The preparation method of coal water slurry specifically comprises the following steps:
(1) by raw material crushing to particle diameter≤13mm, then with production water in mass ratio 5:5 roughly grind at temperature is 50 DEG C after mixing, obtain the first slurry, coal particle particle diameter≤2.4mm in described first slurry, and in the first slurry, the particle diameter of coal particle of 35% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 75% material as slurry A, solids content control 10% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of coal particle of 92.5% is more than or equal to 75 μm in slurry A, coal particle particle diameter≤0.5mm in described second slurry, and in the second slurry, the particle diameter of coal particle of 86% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 3.4% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 65% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1:0.8 with production water, be incorporated as the additive sulfonated lignin of 0.5% of dry coal quality in the 4th slurry, carry out fine grinding, using material after the fine grinding of 65% as slurry B, after the fine grinding of 35%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in slurry B, and the particle diameter of the coal particle of 95% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive sulfonated lignin of 0.1% of dry coal quality in the 5th slurry are incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in described slurry C, and the particle diameter of the coal particle of 90% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) by slurry A, slurry B and slurry C in mass ratio 7.5:1.5:1 be mixed to get mixed slurry, be incorporated as the additive humate of 1% of dry coal quality in mixed slurry, through pinch mixed, shear (120r/min) process after, viscosity <1200mpas (the 100S that concentration is 62% coal water slurry product, described coal water slurry can be obtained
-1).
Embodiment 3
In the present embodiment, prepare coal water slurry by the weakly caking coal in Ordos, inner Mongolia god mansion district, in this coal, a point bleed is 5.7%, and full water is 13.6%, and ash content is 6.9%, and particle diameter is less than 50mm; The preparation method of coal water slurry specifically comprises the following steps:
(1) by raw material crushing to particle diameter≤13mm, then with production water in mass ratio 6:4 roughly grind at temperature is 25 DEG C after mixing, obtain the first slurry, coal particle particle diameter≤2.4mm in described first slurry, and in the first slurry, the particle diameter of coal particle of 37% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 80% material as slurry A, solids content control 9% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of coal particle of 91.5% is more than or equal to 75 μm in slurry A, coal particle particle diameter≤0.5mm in second slurry, and in the second slurry, the particle diameter of coal particle of 90% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 4.5% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 63% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1:0.7 with production water, be incorporated as the additive naphthalene sulfonic acidformaldehyde condensation product of 0.1% of dry coal quality in the 4th slurry, carry out fine grinding, using material after the fine grinding of 70% as slurry B, after the fine grinding of 30%, material is as the 5th slurry, described slurry B coal particle particle diameter≤0.5mm, and in 96% the particle diameter of coal particle be more than or equal to 25 μm and be less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive naphthalene sulfonic acidformaldehyde condensation product of 1% of dry coal quality in the 5th slurry is incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in described slurry C, and the particle diameter of the coal particle of 96% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) by slurry A, slurry B and slurry C in mass ratio 7.6:1.4:1 be mixed to get mixed slurry, be incorporated as the additive naphthalene sulfonic acidformaldehyde condensation product of 0.5% of dry coal quality in mixed slurry, through pinch mixed, shear (80r/min) process after, the coal water slurry product that concentration is 70% can be obtained, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 4
Prepare coal water slurry by brown coal in the present embodiment, the brown coal of employing are identical with embodiment 1, and the preparation method of coal water slurry is as follows:
(1) by raw material crushing to particle diameter≤13mm, then with production water in mass ratio 3:7 roughly grind at temperature is 10 DEG C after mixing, obtain the first slurry, coal particle particle diameter≤2.4mm in the first slurry, and in the first slurry, the particle diameter of coal particle of 25% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 90% material as slurry A, solids content control 5% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of coal particle of 90% is more than or equal to 75 μm in slurry A, coal particle particle diameter≤0.5mm in described second slurry, and in the second slurry, the particle diameter of coal particle of 85% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 1% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 35% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1:1 with production water, be incorporated as the additive sulfonated lignin of 0.5% of dry coal quality in the 4th slurry, carry out fine grinding, using material after the fine grinding of 90% as slurry B, after the fine grinding of 10%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in described slurry B, and the particle diameter of the coal particle of 90% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive sulfonated lignin of 0.5% of dry coal quality in the 5th slurry are incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in slurry C, and the particle diameter of the coal particle of 93% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) by slurry A, slurry B and slurry C in mass ratio 7:2:1 be mixed to get mixed slurry, be incorporated as the additive sulfonated lignin of 0.1% of dry coal quality in mixed slurry, through pinch mixed, shear (90r/min) process after, the coal water slurry product that concentration is 75% can be obtained, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 5
Prepare coal water slurry by brown coal in the present embodiment, the brown coal of employing are identical with embodiment 1, and the preparation method of coal water slurry is as follows:
(1) by raw material crushing to particle diameter≤13mm, then with production water in mass ratio 3:7 roughly grind at temperature is 10 DEG C after mixing, obtain the first slurry, coal particle particle diameter≤2.4mm in the first slurry, and in the first slurry, the particle diameter of coal particle of 30% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 70% material as slurry A, solids content control 25% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of coal particle of 95% is more than or equal to 75 μm in slurry A, coal particle particle diameter≤0.5mm in described second slurry, and in the second slurry, the particle diameter of coal particle of 85% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 5% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 65% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1.5:1 with production water, be incorporated as the additive sulfonated lignin of 1% of dry coal quality in the 4th slurry, carry out fine grinding, using material after the fine grinding of 80% as slurry B, after the fine grinding of 20%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in described slurry B, and the particle diameter of the coal particle of 95% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive sulfonated lignin of 0.5% of dry coal quality in the 5th slurry are incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in slurry C, and the particle diameter of the coal particle of 93% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) by slurry A, slurry B and slurry C in mass ratio 8:1:1 be mixed to get mixed slurry, be incorporated as the additive sulfonated lignin of 0.1% of dry coal quality in mixed slurry, through pinch mixed, shear (50r/min) process after, the coal water slurry product that concentration is 55% can be obtained, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 6
Prepare coal water slurry by brown coal in the present embodiment, the brown coal of employing are identical with embodiment 1, and the preparation method of coal water slurry is as follows:
(1) by raw material crushing to particle diameter≤13mm, then with production water in mass ratio 5:5 roughly grind at temperature is 10 DEG C after mixing, obtain the first slurry, coal particle particle diameter≤2.4mm in the first slurry, and in the first slurry, the particle diameter of coal particle of 28% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 80% material as slurry A, solids content control 15% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of coal particle of 93% is more than or equal to 75 μm in slurry A, coal particle particle diameter≤0.5mm in described second slurry, and in the second slurry, the particle diameter of coal particle of 82% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 5% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 65% material as the 4th slurry;
(4) in the 4th slurry, be incorporated as the additive sulfonated lignin of 1% of dry coal quality in the 4th slurry, carry out fine grinding, using material after the fine grinding of 70% as slurry B, after the fine grinding of 30%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in described slurry B, and the particle diameter of the coal particle of 95% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive sulfonated lignin of 0.5% of dry coal quality in the 5th slurry are incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in slurry C, and the particle diameter of the coal particle of 93% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) by slurry A, slurry B and slurry C in mass ratio 7:2:1 be mixed to get mixed slurry, be incorporated as the additive sulfonated lignin of 0.1% of dry coal quality in mixed slurry, through pinch mixed, shear (70r/min) process after, the coal water slurry product that concentration is 60% can be obtained, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 7
The difference of the present embodiment and embodiment 1 is only, by the 7.2:1.3:1.5 mixing in mass ratio of slurry A, slurry B and slurry C in step (6), all the other preparation processes and condition are all identical with embodiment 1, obtain the coal water slurry product that concentration is 59.5%, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 8
The difference of the present embodiment and embodiment 3 is only, by the 7.0:1.5:1.5 mixing in mass ratio of slurry A, slurry B and slurry C in step (6), all the other preparation processes and condition are all identical with embodiment 3, obtain the coal water slurry product that concentration is 71.8%, the viscosity <1200mpas (100S of described coal water slurry
-1).
Embodiment 9
The difference of the present embodiment and embodiment 4 is only, by the 5:3:2 mixing in mass ratio of slurry A, slurry B and slurry C in step (6), all the other preparation processes and condition are all identical with embodiment 4, obtain the coal water slurry product that concentration is 68.5%, the viscosity <1200mpas (100S of described coal water slurry
-1).
Comparative example 1
The difference of this comparative example and embodiment 1 is only, by the 4:4:2 mixing in mass ratio of slurry A, slurry B and slurry C in step (6), all the other preparation processes and condition are all identical with embodiment 1, and the concentration of the coal water slurry obtained is only 38.2%.
Comparative example 2
The difference of this comparative example and embodiment 2 is only, by the 9:0.5:0.5 mixing in mass ratio of slurry A, slurry B and slurry C in step (6), all the other preparation processes and condition are all identical with embodiment 2, and the concentration of the coal water slurry obtained is only 33%.
Comparative example 3
The difference of this comparative example and embodiment 3 is only, by the 6:1:3 mixing in mass ratio of slurry A, slurry B and slurry C in step (6), all the other preparation processes and condition are all identical with embodiment 3, and the concentration of the coal water slurry obtained is only 37.5%.
Applicant states, the present invention illustrates coal water slurry of the present invention and preparation method thereof by above-described embodiment, but the present invention is not limited to above-described embodiment, does not namely mean that the present invention must rely on above-described embodiment and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of raw material selected by the present invention, all drops within protection scope of the present invention and open scope.
Claims (10)
1. a coal water slurry, it is characterized in that, described coal water slurry comprises the low-rank coal slurry C of the low-rank coal slurry A of coal particle particle diameter≤2.4mm, the low-rank coal slurry B of coal particle particle diameter≤0.5mm and coal particle particle diameter≤0.3mm, and the mass ratio of described slurry A, slurry B and slurry C is 5 ~ 8:1 ~ 3:1 ~ 2;
Wherein, in described slurry A, the particle diameter of coal particle of more than 90% is more than or equal to 75 μm; In described slurry B, the particle diameter of coal particle of more than 90% is more than or equal to 25 μm and is less than or equal to 50 μm; In described slurry C, the particle diameter of coal particle of more than 90% is more than or equal to 5 μm and is less than or equal to 15 μm.
2. coal water slurry according to claim 1, is characterized in that, the coal particle particle diameter of described slurry A is 1 μm ~ 2.4mm, preferably 60 μm ~ 2.4mm, further preferred 75 μm ~ 2.4mm;
Preferably, the coal particle particle diameter of described slurry B is 1 μm ~ 0.5mm, preferably 25 μm ~ 0.5mm, preferably 25 μm ~ 250 μm further, further preferably 25 μm ~ 50 μm;
Preferably, the coal particle particle diameter of described slurry C is 1 μm ~ 0.3mm, preferably 1 μm ~ 200 μm, preferably 1 μm ~ 100 μm further, further preferably 5 μm ~ 15 μm;
Preferably, described low-rank coal is selected from the combination of any one or at least two kinds in brown coal, long-flame coal, non-caking coal, weakly caking coal;
Preferably, the concentration of described coal water slurry is more than 55%, preferred 60-75%.
3. the preparation method of coal water slurry according to claim 1 and 2, it is characterized in that, described method for: with low-rank coal for raw material prepares slurry A, slurry B and the slurry C described in claim 1 or 2, slurry A, slurry B and slurry C 5 ~ 8:1 in mass ratio ~ 3:1 ~ 2 are mixed, and after after pinching mixed, shearing treatment, coal water slurry product can be obtained.
4. preparation method according to claim 3, is characterized in that, described method comprises the steps:
(1) raw material low-rank coal is broken, then roughly grind after mixing 3 ~ 5:5 ~ 7 in mass ratio with production water, obtain the first slurry;
(2) the first slurry is carried out dehydration upgrading, solids content control 70 ~ 90% material as slurry A, solids content control 5 ~ 25% material as the second slurry;
(3) by second pulp concentration dehydration, solids content control 1 ~ 5% material as the 3rd slurry, solids content control 35 ~ 65% material as the 4th slurry;
(4) carry out fine grinding after being mixed according to mass ratio 1 ~ 1.5:0 ~ 1 with production water by the 4th slurry, will be more than or equal to 50% and material is as slurry B after being less than the fine grinding of 100%, after being less than or equal to the fine grinding of 50%, material is as the 5th slurry;
(5) the 5th slip is carried out Ultrafine Grinding, as slurry C;
(6) slurry A, slurry B and slurry C 5 ~ 8:1 in mass ratio ~ 3:1 ~ 2 are mixed, after pinching mixed, shearing treatment, coal water slurry product can be obtained.
5. preparation method according to claim 4, is characterized in that, raw material low-rank coal is crushed to particle diameter≤13mm in (1) by step;
Preferably, coal particle particle diameter≤2.4mm in described first slurry of step (1), and in the first slurry, the particle diameter of coal particle of more than 20% is less than or equal to 75 μm;
Preferably, step (1) described corase grind is wet-milling, and during grinding, solids content is 30 ~ 55%;
Preferably, the temperature of step (1) described corase grind is 10 ~ 50 DEG C;
Preferably, the mode of rapid (1) described corase grind is ball milling, rod milling or Ball-stirring mill;
Preferably, the rotating speed of described ball milling is 15 ~ 40r/min;
Preferably, the rotating speed of described rod milling is 15 ~ 25r/min;
Preferably, the speed of described agitation grinding is 10 ~ 25m/s.
6. the preparation method according to claim 4 or 5, is characterized in that, the described dehydration upgrading of step (2) is mechanical force dehydration, is preferably centrifuge dehydration;
Preferably, coal particle particle diameter≤2.4mm in the described slurry A of step (2), and the particle diameter of the coal particle of more than 90% is more than or equal to 75 μm;
Preferably, coal particle particle diameter≤0.5mm in described second slurry of step (2), and in the second slurry, the particle diameter of coal particle of more than 80% is less than 75 μm;
Preferably, in the described slurry A of step (2), in the quality of dry coal and the second slurry, the mass ratio of dry coal is 6 ~ 9:1 ~ 4.
7. the preparation method according to any one of claim 4-6, is characterized in that, described 3rd slurry of step (3) uses as production water cycle;
Preferably, coal particle particle diameter≤0.5mm in described 4th slurry of step (3), and in the 4th slurry, the particle diameter of coal particle of more than 80% is less than 75 μm;
Preferably, coal particle particle diameter≤0.5mm in the described slurry B of step (4), and the particle diameter of the coal particle of more than 90% is more than or equal to 25 μm and is less than or equal to 50 μm;
Preferably, coal particle particle diameter≤0.3mm in step (5) described slurry C, and the particle diameter of the coal particle of more than 90% is more than or equal to 5 μm and is less than or equal to 15 μm;
Preferably, the shearing rate of step (6) described shearing treatment is 50 ~ 120r/min.
8. the preparation method according to any one of claim 4-7, it is characterized in that, pinch described in step (4) described fine grinding, step (5) described Ultrafine Grinding and step (6) in mixed, shearing treatment process and add additive, the add-on of described additive is 0.1 ~ 1% of dry coal quality in corresponding slurry;
Preferably, described additive is the combination of any one or at least two kinds in sulfonated lignin, humate and naphthalene sulfonic acidformaldehyde condensation product.
9. the preparation method according to any one of claim 4-8, is characterized in that, described production water is clear water, the non-corrosiveness waste water that produces in the 3rd slurry or Chemical Manufacture.
10. the preparation method according to any one of claim 3-9, is characterized in that, said method comprising the steps of:
(1) raw material low-rank coal is crushed to particle diameter≤13mm, then roughly grind at temperature is 10 ~ 50 DEG C after mixing 3 ~ 5:5 ~ 7 in mass ratio with production water, obtain the first slurry, coal particle particle diameter≤2.4mm in described first slurry, and in the first slurry, the particle diameter of coal particle of more than 20% is less than or equal to 75 μm;
(2) the first slurry is carried out dehydration upgrading, solids content control 70 ~ 90% material as slurry A, solids content control 5 ~ 25% material as the second slurry, coal particle particle diameter≤2.4mm in described slurry A, and the particle diameter of the coal particle of more than 90% is more than or equal to 75 μm, coal particle particle diameter≤0.5mm in described second slurry, and the particle diameter of the coal particle of more than 80% is less than 75 μm;
(3) by second pulp concentration dehydration, solids content control 1 ~ 5% material as the 3rd slurry, described 3rd slurry as production water cycle use, solids content control 35 ~ 65% material as the 4th slurry;
(4) after the 4th slurry being mixed according to mass ratio 1 ~ 1.5:0 ~ 1 with production water, be incorporated as the additive of 0.1 ~ 1% of dry coal quality in the 4th slurry, carry out fine grinding, to 50% be more than or equal to and after being less than the fine grinding of 100% material as slurry B, after being less than or equal to the fine grinding of 50%, material is as the 5th slurry, coal particle particle diameter≤0.5mm in described slurry B, and the particle diameter of the coal particle of more than 90% is more than or equal to 25 μm and is less than or equal to 50 μm;
(5) the 5th slip is carried out Ultrafine Grinding, the additive of 0.1 ~ 1% of dry coal quality in the 5th slurry is incorporated as in Ultrafine Grinding process, using the slurry after Ultrafine Grinding as slurry C, coal particle particle diameter≤0.3mm in described slurry C, and the particle diameter of the coal particle of more than 90% is more than or equal to 5 μm and is less than or equal to 15 μm;
(6) slurry A, slurry B and slurry C 5 ~ 8:1 in mass ratio ~ 3:1 ~ 2 are mixed to get mixed slurry, are incorporated as the additive of 0.1 ~ 1% of dry coal quality in mixed slurry, after pinching mixed, shearing treatment, coal water slurry product can be obtained.
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| CN107586575A (en) * | 2017-10-26 | 2018-01-16 | 西安建筑科技大学 | A kind of water charcoal slurry and preparation method |
| CN109022074A (en) * | 2018-09-07 | 2018-12-18 | 煤科院节能技术有限公司 | A kind of water-coal-slurry and preparation method thereof using interruption grain size distribution |
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