CN103791697B - A kind of method of brown coal air drying dehydration - Google Patents
A kind of method of brown coal air drying dehydration Download PDFInfo
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- CN103791697B CN103791697B CN201210428307.2A CN201210428307A CN103791697B CN 103791697 B CN103791697 B CN 103791697B CN 201210428307 A CN201210428307 A CN 201210428307A CN 103791697 B CN103791697 B CN 103791697B
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Abstract
The invention provides the method for a kind of brown coal air drying dehydration, said method comprising the steps of: raw material brown coal are pulverized by (1); (2) brown coal after pulverizing are added in soak and soak; Wherein, described soak is the aqueous solution containing dehydrating agent, described dehydrating agent comprises the first dehydrating agent and the second dehydrating agent, wherein, described first dehydrating agent be selected from ferrous salt, hypochlorite, chloramines structural compounds and chlorine monoxid one or more, described second dehydrating agent be selected from carboxylate, sulfuric acid, sulfonate and phosphate ester salt one or more, in described soak, the concentration of dehydrating agent is 0.01 ~ 1 % by weight, and the mass ratio of described first dehydrating agent and the second dehydrating agent is 1:1 ~ 5; (3) brown coal after immersion are sent into dewatering screen to filter; (4) dewater in the brown coal feeding dewaterer after filtration further.The inventive method is safe and reliable, and environmental-protecting performance is high, and energy consumption is low, and flow process is simple, is beneficial to commercial Application.
Description
Technical field
The invention belongs to coal processing field, be specifically related to a kind of brown coal drying and dehydrating method, particularly a kind of brown coal air drying dewatering.
Background technology
Coal resources in China is very abundant, and according to the statistics in 20 end of the centurys, the existing brown coal reserves 1,300 hundred million tons verified in the whole nation, accounts for about 13% of national coal gross reserves.Predict the outcome according to another whole nation third time coal resources and show, separately there is brown coal prognostic resources 1,903 hundred million tons in the whole nation, accounts for 4.18% of national coal prognostic resources.But because brown coal water content is high, be generally 30 % by weight ~ 50 about % by weight, directly cause that its calorific value is low, transportation radius is little, constrain the high-efficiency comprehensive utilization of brown coal.Therefore, if realize lignite resource Appropriate application, drying and dehydrating is a most important step.
In brown coal drying and dehydrating technique, there is multiple different drying and dehydrating device and drying dehydration process, to reach the object improving brown coal calorific value and lignite resource level of comprehensive utilization.The more drying dehydration process of current application is mainly divided into two large classes, and a class is the convection drying dewatering process of coal-fired flue-gas direct contact type, and a class is the contact drying dewatering process of superheated steam indirect contact.The part but these drying dehydration process all come with some shortcomings, as convection drying dewatering process produces, Dust Capacity is large, the rear easy spontaneous combustion of brown coal of dehydration; Superheated steam contact drying dewatering process energy consumption is high, and exhaust emissions amount is large.Therefore, be badly in need of in this area that a kind of safety and environmental protection, energy consumption are low, the simple brown coal drying and dehydrating technique of flow process.
Summary of the invention
Therefore, the invention provides the method for a kind of brown coal air drying dehydration, the method is different from prior art in drying dehydration process.Particularly, the object of the invention is the deficiency in order to aspects such as overcoming in existing brown coal drying and dehydrating technique that energy consumption is high, equipment investment is large and Dust Capacity is large, provide a kind of safe and reliable, environmental-protecting performance is high, energy consumption is low, the method for the simple brown coal air drying dehydration of flow process.
The object of the invention is to be achieved through the following technical solutions.
The invention provides the method for a kind of brown coal air drying dehydration, said method comprising the steps of:
(1) raw material brown coal are pulverized;
(2) brown coal after pulverizing are added in soak and soak; Wherein,
Described soak is the aqueous solution containing dehydrating agent, described dehydrating agent comprises the first dehydrating agent and the second dehydrating agent, wherein, described first dehydrating agent be selected from ferrous salt, hypochlorite, chloramines structural compounds and chlorine monoxid one or more, described second dehydrating agent be selected from carboxylate, sulfuric acid, sulfonate and phosphate ester salt one or more, in described soak, the concentration of dehydrating agent is 0.01 ~ 1 % by weight, and the weight ratio of described first dehydrating agent and the second dehydrating agent is 1:1 ~ 5;
(3) brown coal after immersion are sent into dewatering screen to filter;
(4) dewater in the brown coal feeding dewaterer after filtration further.
According to method provided by the invention, wherein, the average grain diameter of the brown coal after pulverizing in step (1) is less than 13mm, is preferably less than 10mm.
According to method provided by the invention, wherein, described step (1) comprising: added in disintegrating machine by brown coal and pulverize.
According to method provided by the invention, wherein, the first suitable dehydrating agent be selected from ferrous salt, hypochlorite, chloramines structural compounds and chlorine monoxid one or more, be preferably ferrous salt and/or hypochlorite.
According to method provided by the invention, wherein, suitable ferrous salt comprises the inorganic ferrous salt that such as frerrous chloride, ferrous nitrate and ferrous sulfate etc. are soluble in water.
According to method provided by the invention, wherein, the cation of suitable hypochlorite can be the common metal ion such as sodium ion, potassium ion and calcium ion.Such as, hypochlorite is clorox, postassium hypochlorite or calcium hypochlorite.
According to method provided by the invention, wherein, suitable chloramines structural compounds can be monochloro amine, dichlormaine or three chloramines.
According to method provided by the invention, wherein, the second suitable dehydrating agent be selected from carboxylate, sulfuric acid, sulfonate and phosphate ester salt one or more, be preferably sulfuric acid and/or sulfonate.
According to method provided by the invention, wherein, suitable carboxylic salt comprises 8 ~ 22 carbon atom alkyl carboxylates and 12 ~ 18 fat of carbon atom alcohol polyethenoxy ether carboxylates.Cation in carboxylate can be sodium or ammonium.Such as, described carboxylate is Brij 35 carboxylic acid sodium.
According to method provided by the invention, wherein, suitable sulfuric acid comprises 10 ~ 18 carbon atom alkyl sulfate, 12 ~ 18 fat of carbon atom alcohol polyoxyethylene ether sulfates and 11 ~ 17 carbon atom fatty acid glyceride sulfate.Cation in sulfuric acid can be sodium or ammonium.Such as, described sulfuric acid is lauryl sodium sulfate or ethoxylated dodecyl alcohol sodium sulfovinate.
According to method provided by the invention, wherein, suitable sulfonate comprises the alkylbenzenesulfonate of 12 ~ 18 carbon atoms, the alkylsulfonate of 14 ~ 18 carbon atoms and lignosulfonates.Cation in sulfonate can be sodium or ammonium.Such as, described sulfonate is sodium cetanesulfonate or sodium lignin sulfonate.
According to method provided by the invention, wherein, suitable phosphate ester salt comprises the single, double ester salt of alkyl phosphoric acid of 8 ~ 18 carbon atoms.The cation of phosphate ester salt can be potassium, sodium, diethanol amine or triethanolamine etc.
As a kind of preferred embodiment of the present invention, wherein, described first dehydrating agent be selected from frerrous chloride, ferrous nitrate, ferrous sulfate, clorox, postassium hypochlorite, calcium hypochlorite, monochloro amine, dichlormaine and three chloramines one or more.
As a kind of preferred embodiment of the present invention, described second dehydrating agent be selected from Brij 35 carboxylic acid sodium, lauryl sodium sulfate, ethoxylated dodecyl alcohol sodium sulfovinate, sodium cetanesulfonate and sodium lignin sulfonate one or more.According to method provided by the invention, wherein, the brown coal after pulverizing in described step (2) and the weight ratio of soak are 1:1 ~ 3, are preferably 1:1.5 ~ 2.5.
According to method provided by the invention, wherein, the time that the brown coal after pulverizing in described step (2) soak in soak is 0.5 ~ 8h, is preferably 2 ~ 6h.
According to method provided by the invention, wherein, the weight ratio of described first dehydrating agent and described second dehydrating agent is 1:2 ~ 5.
According to method provided by the invention, wherein, in described soak, the concentration of dehydrating agent is 0.01 ~ 1 % by weight, is preferably 0.04 ~ 0.8 % by weight.
According to method provided by the invention, wherein, the brown coal after the dehydration obtained by step (4) are sent in finished bin and are stored.
According to method provided by the invention, wherein, described method also comprises:
(5) tail coal thickener will be added from dewatering screen and/or the isolated waste water of dewaterer to carry out concentrated obtaining coal slime.
(6) described coal slime is added in filter press carry out press filtration, obtained tail coal.
In the present invention, the tail coal obtained by step (6) can be sent in finished bin.
Preferably, will recycle from tail coal thickener and filter press isolated waste water circulation to soak.
According to method provided by the invention, if brown coal particle is more in the isolated waste water of single series dewatering screen, a series of dewatering screen can be increased.
Preferably, described step (3) comprising: described dewatering screen comprises the first dewatering screen and the second dewatering screen, wherein, the aperture of described first dewatering screen screen cloth is 0.5mm ~ 1mm, the aperture of described second dewatering screen screen cloth is 0.2mm ~ 0.5mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen and filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen.
The method safety of brown coal air drying dehydration provided by the invention is reliable, and environmental-protecting performance is high, and energy consumption is low, simple to operate, is beneficial to commercial Application, under normal temperature condition, realize brown coal drying and dehydrating.Specifically, described method has following beneficial effect:
(1) method flow of brown coal air drying dehydration provided by the invention is simple, convenient operation, and energy consumption is little;
(2) the method is without useless solid, waste liquid generation, the waste water reusable edible in process;
(3) whole process can be carried out at normal temperatures, and without high pressure or high-temperature operation, security is reliable;
(4) adopt steeping tank to soak, soak effective;
(5) whole system is closed system, and coal loss is less than 0.5%;
(6) about 20 % by weight are reduced by the brown moisture in coal after the inventive method process.
Accompanying drawing explanation
Below, describe embodiment of the present invention in detail by reference to the accompanying drawings, wherein:
Fig. 1 is process chart of the present invention, and wherein, 1 is feeder, and 2 is disintegrating machine, and 3 is steeping tank, and 4 is dewatering screen, and 5 is dewaterer, and 6 is finished bin, and 7 is tail coal thickener, and 8 is filter press.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further described in detail, the embodiment provided only in order to illustrate the present invention, instead of in order to limit the scope of the invention.
In the following embodiments, the assay method of raw material brown coal and the rear brown coal moisture of dehydration all carries out according to the assay method of total moisture in the coal of GB/T211-2007.
Embodiment 1
The method that the present embodiment dewaters for illustration of brown coal air drying.The method comprises the following steps:
(1) by moisture be 39.7 % by weight raw material brown coal sent in disintegrating machine 2 by feeder 1 and pulverize, being ground into average grain diameter is the particle being less than 13mm;
(2) brown coal after being pulverized by 1.24kg are sent into be equipped with in the steeping tank 3 of 1.28kg soak and are soaked 0.5h, wherein, soak is the aqueous solution containing clorox and Brij 35 carboxylic acid sodium, and the concentration of clorox and Brij 35 carboxylic acid sodium is respectively 0.005 % by weight and 0.010 % by weight;
(3) brown coal after immersion are sent into dewatering screen 4 to filter, dewatering screen 4 comprises the first dewatering screen and the second dewatering screen, the aperture of the first dewatering screen screen cloth is 0.5mm, the aperture of the second dewatering screen screen cloth is 0.2mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen;
(4) dewater in the brown coal feeding dewaterer 5 after filtration further, obtain the brown coal after 0.75kg dehydration, send into finished bin 6;
(5) waste water deviate from from dewatering screen 4 and dewaterer 5 enters tail coal thickener 7, is separated the coal slime in water outlet further;
(6) from tail coal thickener 7, isolated coal slime enters filter press 8 and is press-filtered out moisture in coal slime, and obtained 0.19kg tail coal, then sends into finished bin 6;
(7) from tail coal thickener 7 and filter press 8, isolated water circulation recycles to steeping tank 3.
After dehydration, the moisture of brown coal is 20.8 % by weight, and the loss of this embodiment coal is that 0.48%(calculates with the butt of coal).
Embodiment 2
The method that the present embodiment dewaters for illustration of brown coal air drying.The method comprises the following steps:
(1) by moisture be 39.7 % by weight raw material brown coal sent in disintegrating machine 2 by feeder 1 and pulverize, being ground into average grain diameter is the particle being less than 8mm;
(2) brown coal after being pulverized by 1.21kg are sent into be equipped with in the steeping tank 3 of 2.10kg soak and are soaked 2h, wherein, soak is the aqueous solution containing frerrous chloride and lauryl sodium sulfate, and the concentration of frerrous chloride and lauryl sodium sulfate is respectively 0.081 % by weight and 0.243 % by weight;
(3) brown coal after immersion are sent into dewatering screen 4 to filter, dewatering screen 4 comprises the first dewatering screen and the second dewatering screen, the aperture of the first dewatering screen screen cloth is 0.5mm, the aperture of the second dewatering screen screen cloth is 0.2mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen;
(4) dewater in the brown coal feeding dewaterer 5 after filtration further, obtain the brown coal after 0.69kg dehydration, send into finished bin 6;
(5) waste water deviate from from dewatering screen 4 and dewaterer 5 enters tail coal thickener 7, is separated the coal slime in water outlet further;
(6) from tail coal thickener 7, isolated coal slime enters filter press 8 and is press-filtered out moisture in coal slime, and obtained 0.22kg tail coal, then sends into finished bin 6;
(7) from tail coal thickener 7 and filter press 8, isolated water circulation recycles to steeping tank 3.
After dehydration, the moisture of brown coal is 20.5 % by weight, and the loss of this embodiment coal is that 0.491%(calculates with the butt of coal).
Embodiment 3
The method that the present embodiment dewaters for illustration of brown coal air drying.The method comprises the following steps:
(1) by moisture be 39.7 % by weight raw material brown coal sent in disintegrating machine 2 by feeder 1 and pulverize, being ground into average grain diameter is the particle being less than 6mm;
(2) brown coal after being pulverized by 1.26kg are sent into be equipped with in the steeping tank 3 of 3.08kg soak and are soaked 4h, wherein, soak is the aqueous solution containing dichlormaine and ethoxylated dodecyl alcohol sodium sulfovinate, and the concentration of dichlormaine and ethoxylated dodecyl alcohol sodium sulfovinate is respectively 0.112 % by weight and 0.418 % by weight;
(3) brown coal after immersion are sent into dewatering screen 4 to filter, dewatering screen 4 comprises the first dewatering screen and the second dewatering screen, the aperture of the first dewatering screen screen cloth is 0.5mm, the aperture of the second dewatering screen screen cloth is 0.2mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen;
(4) dewater in the brown coal feeding dewaterer 5 after filtration further, obtain the brown coal after 0.67kg dehydration, send into finished bin 6;
(5) waste water deviate from from dewatering screen 4 and dewaterer 5 enters tail coal thickener 7, is separated the coal slime in water outlet further;
(6) from tail coal thickener 7, isolated coal slime enters filter press 8 and is press-filtered out moisture in coal slime, and obtained 0.26kg tail coal, then sends into finished bin 6;
(7) from tail coal thickener 7 and filter press 8, isolated water circulation recycles to steeping tank 3.
After dehydration, the moisture of brown coal is 18.6 % by weight, and the loss of this embodiment coal is that 0.33%(calculates with the butt of coal).
Embodiment 4
The method that the present embodiment dewaters for illustration of brown coal air drying.The method comprises the following steps:
(1) by moisture be 39.7 % by weight raw material brown coal sent in disintegrating machine 2 by feeder 1 and pulverize, being ground into average grain diameter is the particle being less than 3mm;
(2) brown coal after being pulverized by 1.23kg are sent into be equipped with in the steeping tank 3 of 2.55kg soak and are soaked 6h, wherein, soak is the aqueous solution containing chlorine monoxide and sodium lignin sulfonate, and the concentration of chlorine monoxide and sodium lignin sulfonate is respectively 0.142 % by weight and 0.704 % by weight;
(3) brown coal after immersion are sent into dewatering screen 4 to filter, dewatering screen 4 comprises the first dewatering screen and the second dewatering screen, the aperture of the first dewatering screen screen cloth is 1mm, the aperture of the second dewatering screen screen cloth is 0.2mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen;
(4) dewater in the brown coal feeding dewaterer 5 after filtration further, obtain the brown coal after 0.87kg dehydration, send into finished bin 6;
(5) waste water deviate from from dewatering screen 4 and dewaterer 5 enters tail coal thickener 7, is separated the coal slime in water outlet further;
(6) from tail coal thickener 7, isolated coal slime enters filter press 8 and is press-filtered out moisture in coal slime, and obtained 0.04kg tail coal, then sends into finished bin 6;
(7) from tail coal thickener 7 and filter press 8, isolated water circulation recycles to steeping tank 3.
After dehydration, the moisture of brown coal is 18.4 % by weight, and the loss of this embodiment coal is that 0.28%(calculates with the butt of coal).
Embodiment 5
The method that the present embodiment dewaters for illustration of brown coal air drying.The method comprises the following steps:
(1) by moisture be 39.7 % by weight raw material brown coal sent in disintegrating machine 2 by feeder 1 and pulverize, being ground into average grain diameter is the particle being less than 10mm;
(2) brown coal after being pulverized by 3.12kg are sent into be equipped with in the steeping tank 3 of 8.50kg soak and are soaked 4h, wherein, soak is the aqueous solution containing calcium hypochlorite and sodium lignin sulfonate, and the concentration of calcium hypochlorite and sodium lignin sulfonate is respectively 0.125 % by weight and 0.383 % by weight;
(3) brown coal after immersion are sent into dewatering screen 4 to filter, dewatering screen 4 comprises the first dewatering screen and the second dewatering screen, the aperture of the first dewatering screen screen cloth is 1mm, the aperture of the second dewatering screen screen cloth is 0.2mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen;
(4) dewater in the brown coal feeding dewaterer 5 after filtration further, obtain the brown coal after 2.09kg dehydration, send into finished bin 6;
(5) waste water deviate from from dewatering screen 4 and dewaterer 5 enters tail coal thickener 7, is separated the coal slime in water outlet further;
(6) from tail coal thickener 7, isolated coal slime enters filter press 8 and is press-filtered out moisture in coal slime, and obtained 0.23kg tail coal, then sends into finished bin 6;
(7) from tail coal thickener 7 and filter press 8, isolated water circulation recycles to steeping tank 3.
After dehydration, the moisture of brown coal is 19.1 % by weight, and the loss of this embodiment coal is that 0.19%(calculates with the butt of coal).
Embodiment 6
The method that the present embodiment dewaters for illustration of brown coal air drying.The method comprises the following steps:
(1) by moisture be 39.7 % by weight raw material brown coal sent in disintegrating machine 2 by feeder 1 and pulverize, being ground into average grain diameter is the particle being less than 6mm;
(2) brown coal after being pulverized by 3.01kg are sent into be equipped with in the steeping tank 3 of 5.75kg soak and are soaked 4h, wherein, soak is the aqueous solution containing ferrous sulfate and sodium cetanesulfonate, and the concentration of ferrous sulfate and sodium cetanesulfonate is respectively 0.125 % by weight and 0.564 % by weight;
(3) brown coal after immersion are sent into dewatering screen 4 to filter, dewatering screen 4 comprises the first dewatering screen and the second dewatering screen, the aperture of the first dewatering screen screen cloth is 1mm, the aperture of the second dewatering screen screen cloth is 0.2mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen;
(4) dewater in the brown coal feeding dewaterer 5 after filtration further, obtain the brown coal after 1.99kg dehydration, send into finished bin 6;
(5) waste water deviate from from dewatering screen 4 and dewaterer 5 enters tail coal thickener 7, is separated the coal slime in water outlet further;
(6) from tail coal thickener 7, isolated coal slime enters filter press 8 and is press-filtered out moisture in coal slime, and obtained 0.27kg tail coal, then sends into finished bin 6;
(7) from tail coal thickener 7 and filter press 8, isolated water circulation recycles to steeping tank 3.
After dehydration, the moisture of brown coal is 19.9 % by weight, and the loss of this embodiment coal is that 0.09%(calculates with the butt of coal).
Claims (14)
1. a method for brown coal air drying dehydration, said method comprising the steps of:
(1) raw material brown coal are pulverized;
(2) brown coal after pulverizing are added in soak and soak; Wherein,
Described soak is the aqueous solution containing dehydrating agent, described dehydrating agent comprises the first dehydrating agent and the second dehydrating agent, wherein, described first dehydrating agent be selected from ferrous salt, hypochlorite, chloramines structural compounds and chlorine monoxid one or more, described second dehydrating agent be selected from carboxylate, sulfuric acid, sulfonate and phosphate ester salt one or more, in described soak, the concentration of dehydrating agent is 0.01 ~ 1% (weight), and the weight ratio of described first dehydrating agent and the second dehydrating agent is 1:1 ~ 5;
(3) brown coal after immersion are sent into dewatering screen to filter;
(4) dewater in the brown coal feeding dewaterer after filtration further.
2. method according to claim 1, wherein, the average grain diameter of the brown coal after pulverizing in step (1) is less than 13mm.
3. method according to claim 1, wherein, the average grain diameter of the brown coal after pulverizing in step (1) is less than 10mm.
4. the brown coal after according to the method in any one of claims 1 to 3, wherein, pulverizing in described step (2) and the weight ratio of soak are 1:1 ~ 3.
5. the brown coal after according to the method in any one of claims 1 to 3, wherein, pulverizing in described step (2) and the weight ratio of soak are 1:1.5 ~ 2.5.
6. the time that the brown coal after according to the method in any one of claims 1 to 3, wherein, pulverizing in described step (2) soak in soak is 0.5 ~ 8h.
7. the time that the brown coal after according to the method in any one of claims 1 to 3, wherein, pulverizing in described step (2) soak in soak is 2 ~ 6h.
8. according to the method in any one of claims 1 to 3, wherein, the weight ratio of described first dehydrating agent and described second dehydrating agent is 1:2 ~ 5.
9. according to the method in any one of claims 1 to 3, wherein, in described soak, the concentration of dehydrating agent is 0.04 ~ 0.8% (weight).
10. according to the method in any one of claims 1 to 3, wherein, described first dehydrating agent be selected from frerrous chloride, ferrous nitrate, ferrous sulfate, clorox, postassium hypochlorite, calcium hypochlorite, monochloro amine, dichlormaine and three chloramines one or more.
11. according to the method in any one of claims 1 to 3, wherein, described second dehydrating agent be selected from Brij 35 carboxylic acid sodium, lauryl sodium sulfate, ethoxylated dodecyl alcohol sodium sulfovinate, sodium cetanesulfonate and sodium lignin sulfonate one or more.
12. according to the method in any one of claims 1 to 3, and wherein, described method also comprises:
(5) tail coal thickener will be added from dewatering screen and/or the isolated waste water of dewaterer to carry out concentrated obtaining coal slime; With
(6) described coal slime is added in filter press carry out press filtration, obtained tail coal.
13. methods according to claim 12, wherein, described method also comprises and recycling from tail coal thickener and filter press isolated waste water circulation to soak.
14. according to the method in any one of claims 1 to 3, wherein, described step (3) comprising: described dewatering screen comprises the first dewatering screen and the second dewatering screen, wherein, the aperture of described first dewatering screen screen cloth is 0.5 ~ 1mm, the aperture of described second dewatering screen screen cloth is 0.2 ~ 0.5mm, brown coal after immersion are sent into the first dewatering screen filter, then will add the second dewatering screen from the isolated waste water of the first dewatering screen to filter, merge the brown coal filtered through the first dewatering screen and the second dewatering screen.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10263317A (en) * | 1997-03-25 | 1998-10-06 | Mas Fab J Dieffenbacher Gmbh & Co | Apparatus for decreasing moisture content of solid material and/or sludge, filter press as well as control and adjustment device |
| KR100427669B1 (en) * | 2003-11-12 | 2004-04-28 | 디에치인터내셔날주식회사 | Garbage disposal/lignite making system and manufacturing method of lignite using the same |
| CN101220308A (en) * | 2008-01-28 | 2008-07-16 | 沈阳航空工业学院 | Technique for drying low rank coal and producing moulded coal, and complete plant |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10263317A (en) * | 1997-03-25 | 1998-10-06 | Mas Fab J Dieffenbacher Gmbh & Co | Apparatus for decreasing moisture content of solid material and/or sludge, filter press as well as control and adjustment device |
| KR100427669B1 (en) * | 2003-11-12 | 2004-04-28 | 디에치인터내셔날주식회사 | Garbage disposal/lignite making system and manufacturing method of lignite using the same |
| CN101220308A (en) * | 2008-01-28 | 2008-07-16 | 沈阳航空工业学院 | Technique for drying low rank coal and producing moulded coal, and complete plant |
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