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.
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%.