CN103386355B - A kind of high pressure roller selective molecular attraction of middle coal and method for separating - Google Patents

A kind of high pressure roller selective molecular attraction of middle coal and method for separating Download PDF

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CN103386355B
CN103386355B CN201310312400.1A CN201310312400A CN103386355B CN 103386355 B CN103386355 B CN 103386355B CN 201310312400 A CN201310312400 A CN 201310312400A CN 103386355 B CN103386355 B CN 103386355B
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coal
pressure roller
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desliming
roller mill
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CN103386355A (en
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侯英
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University of Science and Technology Liaoning USTL
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Abstract

The high pressure roller selective molecular attraction of a kind of middle coal of the present invention and method for separating, belong to technical field of mineral processing.Carry out according to the following steps: 1. raw coal is crushed to below the feed particle size upper limit being suitable for follow-up cleaning unit, carries out desliming, the raw coal after desliming enters gravitational separation equipment, obtain cleaned coal I, middle coal I and spoil I; 2. middle coal I is crushed to below the grinding particle size upper limit being suitable for high-pressure roller mill, carry out high pressure roller mill ultrafine grinding, product after ultrafine grinding carries out desliming, product introduction gravitational separation equipment after desliming, obtain cleaned coal II, middle coal II and spoil II, middle coal II turns back to high-pressure roller mill and middle coal I and is merged together and carries out pulverizing and sorting; 3. black water carries out flotation after concentrating, sizing mixing, and obtains floatation clean coal and floating tail-coal.The inventive method is compared with middle coal tradition crushing process, and product dissociation degree is high, and subsequent reselection is effective, can improve clean coal yield, coal resources is obtained fully, reasonably reclaims and utilize, reduce the wasting of resources.

Description

A kind of high pressure roller selective molecular attraction of middle coal and method for separating
Technical field
The present invention relates to the process technology of coal in washing, particularly a kind of high pressure roller selective molecular attraction of middle coal and method for separating.
Background technology
Coal is that China's distribution is the widest, and the energy resources that reserves are maximum, occupy extremely important status in the national economy and social development of China.Although there are abundant coal resources in China, coal kind and distributed number thereof are extremely uneven, and the main coking coal such as rich coal, coking coal, lean coal is rare.According to statistics, except brown coal account for proved reserves 12.7% except, in hard coal, lower-grade metamorphic bituminous proportion is 42.4% of total amount, and meager coal and anthracite account for 17.3%.The negligible amounts of mesometamorphism bituminous coal, only accounts for 27.6%, and is mostly bottle coal, accounts for 46.9% of mesometamorphism bituminous coal.Rich coal, coking coal, lean coal are less, account for 13.6%, 24.3% and 15.1% of mesometamorphism bituminous coal respectively.At present, the middle coal of coking coal coal preparation plant of China is almost all as fuel, and this is undoubtedly the significant wastage to China's scarce coal resources.
Equally, also containing a large amount of locked middlingses in thermal coal, after washing, a large amount of middle coals can also be produced.When coal in handle is directly used as fuel, unfavorable to boiler operatiopn, except boiler efficiency reduces, also there is the phenomenons such as temperature obviously declines and combustion instability, slag tap deterioration, reduce reliability and the economy of boiler operatiopn significantly, increase heavy oil combustion amount, thus reduce generating efficiency, add cost of electricity-generating, contaminated environment, causes the waste of resource.Therefore, the efficient method for separating of R and D, in enforcement, coal selects again, to the Appropriate application of coal resources in China and environmental protection significant.
High-pressure roller mill is the main flow of ore dressing field much broken and lessmill technology and selective molecular attraction technical development both at home and abroad at present.High-pressure roller mill is a kind of New Grinding Devices based on the design of bed of material pulverization principle, and the principal character that the bed of material is pulverized is: crushed work pressure is large, granule interior is cracked, has certain selective molecular attraction effect, can improve the dissociation degree of product.Other advantage can be summarized as: disposal ability is large, reaches as high as 3 400t/h; Unit work consumptiom is low, about lower by 20% ~ 50% than gyratory crusher, jaw crusher, rod mill; Floor space is few, equipment operation rate is high.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of high pressure roller selective molecular attraction and method for separating of middle coal, the dissociation degree of milling product can be improved, improve the washability of broken rear middle coal, under the prerequisite ensureing quality of cleaned coal, improve clean coal yield, realize reducing Grin-ding energ7 simultaneously, reach the efficiency utilization of coal resources.
The high pressure roller selective molecular attraction of a kind of middle coal of the present invention and method for separating, adopt high-pressure roller mill to pulverize coal in washing, the product after pulverizing carries out sorting, and step is as follows:
(1) raw coal is crushed to below the feed particle size upper limit being suitable for follow-up cleaning unit, enter desliming screen and carry out desliming, the black water after desliming enters slurry circulating system, and the raw coal after desliming carries out gravity treatment I, obtains cleaned coal I, middle coal I and spoil I;
(2) in coal I be crushed to be suitable for high-pressure roller mill the grinding particle size upper limit below, carry out high pressure roller mill ultrafine grinding, during high-pressure roller mill work, roll gap pressure is 4 ~ 6MPa, roller speed is 1 ~ 3m/min, roll gap is 2 ~ 30mm, products application sieve aperture after high pressure roller mill ultrafine grinding is 25mm, 13mm, the sieve of 6mm or 3mm sieves, on-the-sieve material returns high-pressure roller mill and new feed and merges and pulverize, undersize material carries out desliming, product after desliming carries out gravity treatment II, obtain the cleaned coal II after the broken choosing again of coal dust, middle coal II and spoil II, middle coal II returns high-pressure roller mill and middle coal I and is merged together and carries out pulverizing and sorting again,
(3) black water after desliming enters slurry circulating system, first thickener is entered, thickener overflow enters circulating water pool, thickener underflow carries out flotation after pretreatment of sizing mixing, floating tail-coal enters tail coal thickener, cleaned coal enters clean coal pressur filter, and press filtration product is floatation clean coal, and filtrate returns mixing cirtern; Tail coal thickener overflow enters circulating water pool, and underflow enters tail coal filter press, and tail coal press filtration filtrate enters circulating water pool, and press filtration product is tail coal product.
In described step (1), the feed particle size upper limit of follow-up cleaning unit is 50 ~ 200mm.
In described step (1), bi-fluted roller type disintegrating machine, jaw crusher, impact breaker or ring hammer disintegrating machine selected by raw coal disintegrating apparatus.
In described step (1), the equipment that gravity treatment I adopts is jigging separator, tiltedly takes turns dense media separator, vertical wheel dense media separator, shallow slot dense media separator or dense medium cyclone.
In described step (2), the grinding particle size upper limit of high-pressure roller mill is 50 ~ 100mm.
In described step (2), the material that middle coal I is suitable for gravity treatment after high pressure roller is pulverized can turn back to gravity treatment I and carry out sorting, also can carry out separately gravity treatment II process.
In described step (2), the equipment that gravity treatment II adopts is heavy medium cyclone, spiral, TBS hindered bed separator or adverse current separator.
In described step (3), before coal slime flotation, can ball mill be set up, improve quality and the productive rate of floatation clean coal.
In described step (3), coal slime is not suitable for the situation of flotation, the black water after desliming enters thickener, thickener overflow enters circulating water pool, thickener underflow enters filter press, and filter press filtrate enters circulating water pool, and filter press product is coal slime product.
The high pressure roller selective molecular attraction of a kind of middle coal of the present invention and method for separating, compare with sorting process with middle coal tradition is broken, product dissociation degree is high, subsequent reselection is effective, improves the sharpness of separation of equipment, under the prerequisite ensureing quality of cleaned coal, clean coal yield can be improved, reduce Coal Transport cost, coal resources are obtained fully, reasonably reclaim and utilize, reducing the wasting of resources.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the process chart of the embodiment of the present invention 1,2,4,5;
Fig. 3 is the process chart of the embodiment of the present invention 3.
Detailed description of the invention
embodiment 1
Raw coal is coking coal, and ash content is 18.59%, and coal washery type is mine type coal washery, and disposal ability is 4,000,000 t/a.Carry out sorting after adopting high-pressure roller mill centering coal to carry out ultrafine grinding, processing step is as follows:
(1) raw coal enters the sieve that sieve aperture is 200mm, on-the-sieve material is merged together with undersize material after adopting bi-fluted roller type crusher in crushing, enter the desliming screen that sieve aperture is 0.5mm, black water removes thickener, desliming screen on-the-sieve material enters vertical wheel dense media separator, sub-elect cleaned coal I, middle coal I and spoil I, cleaned coal I is transported to cleaned coal storehouse, and spoil I is transported to hillock;
(2) in, coal I enters the sieve that sieve aperture is 50mm, and be merged together with undersize material after on-the-sieve material adopts jaw crushing crusher machine and carry out high pressure roller mill ultrafine grinding, during work, roll gap pressure is 5.0MPa, and roller speed is 1.6m/min, and roll gap is 6mm; Material after pulverizing enters the sieve that sieve aperture is 6mm, on-the-sieve material and high-pressure roller mill pan feeding are merged together and carry out high pressure roller mill ultrafine grinding, undersize material enters the desliming screen that sieve aperture is 0.5mm, black water removes thickener, on-the-sieve material enters three-product HM cyclone, sub-elect cleaned coal II, middle coal II and spoil II, cleaned coal II is transported to cleaned coal storehouse, and spoil II is transported to hillock; Middle coal II merges laggard horizontal high voltage roller with middle coal I and grinds ultrafine grinding, repeats the operation of step (2);
(3) black water is after thickener process, and thickener overflow enters circulating water pool, and thickener underflow carries out flotation after pretreatment of sizing mixing, floating tail-coal enters tail coal thickener, cleaned coal enters clean coal pressur filter, and press filtration product is floatation clean coal, and filtrate returns mixing cirtern; Tail coal thickener overflow enters circulating water pool, and underflow enters tail coal filter press, and tail coal press filtration filtrate enters circulating water pool, and press filtration product is floating tail-coal.
The productive rate of cleaned coal I is 57.54%, and ash content is 10.41%; The productive rate of middle coal I is 7.46%, and ash content is 24.00%; The productive rate of spoil I is 9.89%, and ash content is 71.91%; The productive rate of cleaned coal II is 3.52%, and ash content is 10.12%; The productive rate of spoil II is 1.23%, and ash content is 66.26%; The productive rate of floatation clean coal is 20.70%, and ash content is 10.00%; The productive rate of floating tail-coal is 7.12%, and ash content is 31.55%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal II can improve 1.57%.
embodiment 2
Raw coal is coking coal, and ash content is 39.75%, and coal washery type is coal washery, Qun Kuangxing center, and disposal ability is 5,000,000 t/a.Carry out sorting after adopting high-pressure roller mill centering coal to carry out ultrafine grinding, processing step is as follows:
(1) raw coal enters the sieve that sieve aperture is 50mm, on-the-sieve material is merged together with undersize material after adopting bi-fluted roller type crusher in crushing, enter the desliming screen that sieve aperture is 0.5mm, black water removes thickener, desliming screen on-the-sieve material enters three-product HM cyclone, sub-elect cleaned coal I, middle coal I and spoil I, cleaned coal I is transported to cleaned coal storehouse, and spoil I is transported to hillock;
(2) in, coal I carries out high pressure roller mill ultrafine grinding, and during work, roll gap pressure is 4.0MPa, and roller speed is 2.0m/min, and roll gap is 3mm; Material after pulverizing enters the sieve that sieve aperture is 3mm, on-the-sieve material and high-pressure roller mill pan feeding are merged together and carry out high pressure roller mill ultrafine grinding, undersize material enters the desliming screen that sieve aperture is 0.5mm, black water removes thickener, and on-the-sieve material enters TBS hindered bed separator I, sub-elects cleaned coal II, middle coal II, middle coal II enters TBS hindered bed separator II, sub-elect middle coal III and spoil II, cleaned coal II is transported to cleaned coal storehouse, and spoil II is transported to hillock; Middle coal III merges laggard horizontal high voltage roller with middle coal I and grinds ultrafine grinding, repeats the operation of step (2);
(3) black water is after thickener process, and thickener overflow enters circulating water pool, and thickener underflow carries out flotation after pretreatment of sizing mixing, floating tail-coal enters tail coal thickener, cleaned coal enters clean coal pressur filter, and press filtration product is floatation clean coal, and filtrate returns mixing cirtern; Tail coal thickener overflow enters circulating water pool, and underflow enters tail coal filter press, and tail coal press filtration filtrate enters circulating water pool, and press filtration product is floating tail-coal.
The productive rate of cleaned coal I is 36.64%, and ash content is 10.11%; The productive rate of middle coal I is 21.89%, and ash content is 39.05%; The productive rate of spoil I is 27.72%, and ash content is 71.79%; The productive rate of cleaned coal II is 2.62%, and ash content is 10.98%; The productive rate of spoil II is 8.52%, and ash content is 65.88%; The productive rate of floatation clean coal is 14.06%, and ash content is 11.00%, and the productive rate of floating tail-coal is 10.43%, and ash content is 34.82%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal II can improve 1.06%.
embodiment 3
Raw coal is coking coal, and ash content is 19.40%, and coal washery type is mine type coal washery, and disposal ability is 3,000,000 t/a.Carry out sorting after adopting high-pressure roller mill centering coal to carry out ultrafine grinding, processing step is as follows:
(1) raw coal enters the sieve that sieve aperture is 50mm, be merged together with undersize material after on-the-sieve material adopts bi-fluted roller type crusher in crushing and enter jigging separator, sub-elect cleaned coal I, middle coal I and spoil I, cleaned coal I is transported to cleaned coal storehouse, and spoil I is transported to hillock;
(2) in, coal I carries out high pressure roller mill ultrafine grinding, and during work, roll gap pressure is 6.0MPa, and roller speed is 1.0m/min, and roll gap is 13mm; Material after pulverizing enters the sieve that sieve aperture is 13mm, on-the-sieve material and high-pressure roller mill pan feeding are merged together and carry out high pressure roller mill ultrafine grinding, undersize material enters the desliming screen that sieve aperture is 0.5mm, black water removes thickener, on-the-sieve material enters spiral, sub-elect cleaned coal II, middle coal II and spoil II, cleaned coal II is transported to cleaned coal storehouse, and spoil II is transported to hillock; Middle coal II merges laggard horizontal high voltage roller with middle coal I and grinds ultrafine grinding, repeats the operation of step (2);
(3) black water is after thickener process, and thickener overflow enters circulating water pool, and thickener underflow carries out flotation after pretreatment of sizing mixing, floating tail-coal enters tail coal thickener, cleaned coal enters clean coal pressur filter, and press filtration product is floatation clean coal, and filtrate returns mixing cirtern; Tail coal thickener overflow enters circulating water pool, and underflow enters tail coal filter press, and tail coal press filtration filtrate enters circulating water pool, and press filtration product is floating tail-coal.
The productive rate of cleaned coal I is 57.44%, and ash content is 9.92%; The productive rate of middle coal I is 10.90%, and ash content is 21.84%; The productive rate of spoil I is 12.39%, and ash content is 63.62%; The productive rate of cleaned coal II is 2.82%, and ash content is 9.86%; The productive rate of spoil II is 1.72%, and ash content is 62.13%; The productive rate of floatation clean coal is 16.31%, and ash content is 10.00%; The productive rate of floating tail-coal is 9.32%, and ash content is 30.49%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal II can improve 1.38%.
embodiment 4
Raw coal is coking coal, and ash content is 37.99%, and coal washery type is mine type coal washery, and disposal ability is 3,000,000 t/a.Carry out sorting after adopting high-pressure roller mill centering coal to carry out ultrafine grinding, processing step is as follows:
(1) raw coal enters the sieve that sieve aperture is 50mm, on-the-sieve material is merged together with undersize material after adopting bi-fluted roller type crusher in crushing, enter the desliming screen that sieve aperture is 0.5mm, black water removes thickener, desliming screen on-the-sieve material enters tiltedly takes turns dense media separator, sub-elect cleaned coal I, middle coal I and spoil I, cleaned coal I is transported to cleaned coal storehouse, and spoil I is transported to hillock;
(2) in, coal I carries out high pressure roller mill ultrafine grinding, and during work, roll gap pressure is 5.0MPa, and roller speed is 3.0m/min, and roll gap is 3mm; Material after pulverizing enters the sieve that sieve aperture is 3mm, on-the-sieve material and high-pressure roller mill pan feeding are merged together and carry out high pressure roller mill ultrafine grinding, undersize material enters the desliming screen that sieve aperture is 0.5mm, black water removes thickener, on-the-sieve material enters three-product HM cyclone, sub-elect cleaned coal II, middle coal II and spoil II, cleaned coal II is transported to cleaned coal storehouse, and spoil II is transported to hillock; Middle coal II merges laggard horizontal high voltage roller with middle coal I and grinds ultrafine grinding, repeats the operation of step (2);
(3) black water is after thickener process, thickener overflow enters circulating water pool, thickener underflow through pretreatment of sizing mixing laggard enter ball mill carry out ore grinding, product after ore grinding carries out flotation after process of sizing mixing, floating tail-coal enters tail coal thickener, cleaned coal enters clean coal pressur filter, and press filtration product is floatation clean coal, and filtrate returns mixing cirtern; Tail coal thickener overflow enters circulating water pool, and underflow enters tail coal filter press, and tail coal press filtration filtrate enters circulating water pool, and press filtration product is floating tail-coal.
The productive rate of cleaned coal I is 42.32%, and ash content is 8.43%; The productive rate of middle coal I is 12.64%, and ash content is 26.03%; The productive rate of spoil I is 32.11%, and ash content is 75.64%; The productive rate of cleaned coal II is 2.92%, and ash content is 8.78%; The productive rate of spoil II is 2.52%, and ash content is 67.48%; The productive rate of floatation clean coal is 13.05%, and ash content is 8.42%, and the productive rate of floating tail-coal is 7.08%, and ash content is 34.66%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal II can improve 1.15%.
embodiment 5
Raw coal is power coal, ash content 26.81%, and coal washery type is mine type coal washery, and disposal ability is 1,600 ten thousand t/a.Carry out sorting after adopting high-pressure roller mill centering coal to carry out ultrafine grinding, processing step is as follows:
(1) raw coal enters the sieve that sieve aperture is 200mm, on-the-sieve material is merged together with undersize material after adopting bi-fluted roller type crusher in crushing, enter the desliming screen that sieve aperture is 0.5mm, black water removes thickener, desliming screen on-the-sieve material enters three-product HM cyclone, sub-elect cleaned coal I, middle coal I and spoil I, cleaned coal I is transported to cleaned coal storehouse, and spoil I is transported to hillock;
(2) in, coal I enters the sieve that sieve aperture is 100mm, and be merged together with undersize material after on-the-sieve material adopts jaw crushing crusher machine and carry out high pressure roller mill ultrafine grinding, during work, roll gap pressure is 5.5MPa, and roller speed is 2.0m/min, and roll gap is 25mm; Material after pulverizing enters the sieve that sieve aperture is 25mm, on-the-sieve material and high-pressure roller mill pan feeding are merged together and carry out high pressure roller mill ultrafine grinding, undersize material enters the desliming screen that sieve aperture is 0.5mm, black water removes thickener, on-the-sieve material enters three-product HM cyclone, sub-elect cleaned coal II, middle coal II and spoil II, cleaned coal II is transported to cleaned coal storehouse, and spoil II is transported to hillock; Middle coal II merges laggard horizontal high voltage roller with middle coal I and grinds ultrafine grinding, repeats the operation of step (2);
(3) black water is after thickener process, and thickener overflow enters circulating water pool, and thickener underflow enters filter press, and press filtration filtrate enters circulating water pool, and press filtration product is coal slime product.
The productive rate of cleaned coal I is 43.06%, and ash content is 8.39%; The productive rate of middle coal I is 29.74%, and ash content is 24.86%; The productive rate of spoil I is 14.08%, and ash content is 82.36%; The productive rate of cleaned coal II is 10.21%, and ash content is 8.56%; The productive rate of spoil II is 3.37%, and ash content is 78.32%; The productive rate of coal slime is 29.27%, and ash content is 27.62%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal II can improve 2.45%.

Claims (1)

1. the high pressure roller selective molecular attraction of coal and a method for separating in, carry out according to following steps:
(1) raw coal is crushed to below the feed particle size upper limit being suitable for follow-up cleaning unit, enter desliming screen and carry out desliming, the black water after desliming enters slurry circulating system, and the raw coal after desliming carries out gravity treatment I, obtains cleaned coal I, middle coal I and spoil I; Wherein, the feed particle size upper limit of follow-up cleaning unit is 50 ~ 200mm; Wherein bi-fluted roller type disintegrating machine, jaw crusher, impact breaker or ring hammer disintegrating machine selected by raw coal disintegrating apparatus; The equipment that gravity treatment I adopts is jigging separator, tiltedly takes turns dense media separator, vertical wheel dense media separator or shallow slot dense media separator;
It is characterized in that :
(2) in coal I be crushed to be suitable for high-pressure roller mill the grinding particle size upper limit below, carry out high pressure roller mill ultrafine grinding, during high-pressure roller mill work, roll gap pressure is 4 ~ 6MPa, roller speed is 1 ~ 3m/min, roll gap is 2 ~ 30mm, products application sieve aperture after high pressure roller mill ultrafine grinding is 25mm, 13mm, the sieve of 6mm or 3mm sieves, on-the-sieve material returns high-pressure roller mill and new feed and merges and pulverize, undersize material carries out desliming, product after desliming carries out gravity treatment II, obtain the cleaned coal II after the broken choosing again of coal dust, middle coal II and spoil II, middle coal II returns high-pressure roller mill and middle coal I and is merged together and carries out pulverizing and sorting again, wherein, the grinding particle size upper limit of high-pressure roller mill is 50 ~ 100mm, the material that wherein middle coal I is suitable for gravity treatment after high pressure roller is pulverized can turn back to gravity treatment I and carry out sorting, also can carry out separately gravity treatment II process, the equipment that gravity treatment II adopts is heavy medium cyclone, spiral, TBS hindered bed separator or adverse current separator,
(3) black water after desliming enters slurry circulating system, first thickener is entered, thickener overflow enters circulating water pool, thickener underflow carries out flotation after pretreatment of sizing mixing, floating tail-coal enters tail coal thickener, cleaned coal enters clean coal pressur filter, and press filtration product is floatation clean coal, and filtrate returns mixing cirtern; Tail coal thickener overflow enters circulating water pool, and underflow enters tail coal filter press, and tail coal press filtration filtrate enters circulating water pool, and press filtration product is tail coal product.
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