CN103623932B - A kind of whole grinding of high pressure roller of middle coal and method for separating - Google Patents
A kind of whole grinding of high pressure roller of middle coal and method for separating Download PDFInfo
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Abstract
The whole grinding of high pressure roller of middle coal and method for separating belong to a technical field of mineral processing, carry out according to the following steps: 1. middle coal is crushed to below the mill feed size upper limit being suitable for final grinding system; 2. the running parameter of high-pressure roller mill is set, after high-pressure roller mill idle running is normal, the rotating speed of setting feeding belt, the rotating speed of V-type rotor of powder separator and the rotating speed of dust-precipitator, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller; 3. add water whole for high pressure roller ground prod stirring of sizing mixing, and then feeds in floatation equipment, adds collecting agent successively and foaming agent carries out one roughing primary cleaning and once purging selection, obtains floatation clean coal and floating tail-coal.Carry out flotation after the inventive method and ball milling broken with middle coal tradition to compare, product dissociation degree is high, and follow-up flotation effect is good, coal resources is obtained fully, reasonably recovery and utilization.
Description
Technical field
The invention belongs to technical field of mineral processing, particularly the whole grinding of a kind of high pressure roller 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 occur that boiler temperature obviously declines and combustion instability, the phenomenons such as 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, cause 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; 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.
The whole grinding of high pressure roller a kind ofly ore is directly crushed to the grinding process being suitable for follow-up separation, eliminates the ball mill in grinding process.Its energy-saving and cost-reducing effect is maximum, can reach 40% ~ 50%, energy-saving effect highly significant.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of whole grinding of high pressure roller and method for separating of middle coal, the dissociation degree of milling product can be improved, improve the washability of coal in after comminution, realize reducing grinding energy simultaneously, reach the efficiency utilization of coal resources.
The whole grinding of high pressure roller of a kind of middle coal of the present invention and method for separating, carry out according to following steps:
(1) middle coal is crushed to below the mill feed size being suitable for high pressure roller final grinding system;
(2) arrange the running parameter of high-pressure roller mill: high pressure roller mill technique is opened a way completely or is with rim charge to circulate, roll gap pressure is 3 ~ 6MPa, and roller speed is 10 ~ 30r/min, and roll gap is 2 ~ 5mm; After high-pressure roller mill idle running is normal, the rotating speed of setting feeding belt is 0.25 ~ 1m/s, the rotating speed of V-type rotor of powder separator is 50 ~ 500r/min, the rotating speed of dust-precipitator is 1000 ~ 3000r/min, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, then feed in floatation equipment, first add collecting agent and stir 3min, the addition of collecting agent is 400 ~ 1000g/t, then add foaming agent and stir 1min, the addition of foaming agent is 40 ~ 100g/t, carries out roughly selecting 3 ~ 4min, obtains thick cleaned coal; Then add collecting agent and stir 3min, the addition of collecting agent is 200 ~ 500g/t, then adds foaming agent stirring 1min, and the addition of foaming agent is 20 ~ 50g/t, carries out once purging selection 3min; Primary cleaning 2min is carried out to thick cleaned coal, obtains cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select.
In described step (1), raw coal disintegrating apparatus selects jaw crusher, gyratory crusher or high-pressure roller mill.
In described step (1), the mill feed size of high pressure roller final grinding system is 10 ~ 50mm.
In described step (3), floatation equipment is flotation device or flotation column.
In described step (3), collecting agent is that kerosene is or/and diesel oil.
In described step (3), foaming agent is terpenic oil, sec-octyl alcohol or methyl isobutyl carbinol (MIBC).
The whole grinding of high pressure roller of a kind of middle coal of the present invention and method for separating, with middle coal tradition broken with ball milling after carry out sorting and compare, energy conservation and consumption reduction effects is remarkable, product dissociation degree is high, and follow-up flotation effect is good, improves the sharpness of separation of equipment, under the prerequisite ensureing quality of cleaned coal, can clean coal yield be improved, coal resources are obtained fully, reasonably reclaim and utilize, decreasing the waste of resource.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the equipment contact figure of final grinding system of the present invention, and wherein 1 is feed bin, and 2 is feeding belt, and 3 is bucket elevator, and 4 is hopper, and 5 is roll squeezer, and 6 is beater, and 7 is bucket elevator, and 8 is V-type powder concentrator, and 9 is rotoclone collector, and 10 is conveying worm;
Fig. 3 is the process chart of the embodiment of the present invention 1.
Detailed description of the invention
In the embodiment of the present invention, chemical reagent used is commercial.
embodiment 1
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 200mm, and ash content is 24.00%.Carry out flotation after adopting high pressure roller final grinding system centering coal dust mill, processing step is as follows:
(1) in, coal adopts gyratory crusher to carry out fragmentation, and the products application sieve aperture after fragmentation is that the sieve of 30mm sieves, and on-the-sieve material turns back to gyratory crusher and carries out fragmentation, and undersize material enters feed bin;
(2) arrange the running parameter of high-pressure roller mill, high pressure roller is pulverized and is opened a way completely, and roll gap pressure is 6.0MPa, and roller speed is 10r/min, and roll gap is 3mm.After high-pressure roller mill idle running is normal, the rotating speed 0.25m/s of setting feeding belt, the rotating speed 50r/min of V-type rotor of powder separator, the rotating speed 3000r/min of dust-precipitator, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, and then feeds in floatation equipment, first add diesel oil 800g/t and stir 3min, then add sec-octyl alcohol 80g/t and stir 1min, carry out roughly selecting 4min, obtain thick cleaned coal; Then add diesel oil 400g/t and stir 3min, then add sec-octyl alcohol 40g/t stirring 1min, carry out once purging selection 3min; Primary blank carried out to thick cleaned coal selected, obtain cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select.
The productive rate of cleaned coal is 57.90%, and ash content is 8.28%; The productive rate of tail coal is 42.10%, and ash content is 45.62%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 1.57%, and ash content reduces by 0.78%.
embodiment 2
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 50mm, and ash content is 39.05%.Carry out flotation after adopting high pressure roller final grinding system centering coal dust mill, processing step is as follows:
(1) in, coal adopts high-pressure roller mill to carry out fragmentation, and the products application sieve aperture after fragmentation is that the sieve of 10mm sieves, and on-the-sieve material turns back to high-pressure roller mill and carries out fragmentation, and undersize material enters feed bin;
(2) arrange the running parameter of high-pressure roller mill, high pressure roller is pulverized and is opened a way completely, and roll gap pressure is 3.0MPa, and roller speed is 20r/min, and roll gap is 2mm.After high-pressure roller mill idle running is normal, the rotating speed 0.5m/s of setting feeding belt, the rotating speed 200r/min of V-type rotor of powder separator, the rotating speed 3000r/min of dust-precipitator, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, and then feeds in floatation equipment, first add kerosene 400g/t and stir 3min, then add 40g/t terpenic oil, stir 1min, carry out roughly selecting 4min, obtain thick cleaned coal; Then add kerosene 200g/t and stir 3min, then add terpenic oil 20g/t stirring 1min, carry out once purging selection 3min; Primary blank carried out to thick cleaned coal selected, obtain cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select.
The productive rate of cleaned coal is 44.66%, and ash content is 13.43%; The productive rate of tail coal is 55.34%, and ash content is 59.73%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 2.57%, and ash content reduces by 0.86%.
embodiment 3
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 50mm, and ash content is 21.84%.Carry out flotation after adopting high pressure roller final grinding system centering coal dust mill, processing step is as follows:
(1) in, coal adopts jaw crusher to carry out fragmentation, and the products application sieve aperture after fragmentation is that the sieve of 20mm sieves, and on-the-sieve material turns back to jaw crusher and carries out fragmentation, and undersize material enters feed bin;
(2) arrange the running parameter of high-pressure roller mill, high pressure roller pulverized zone rim charge circulates, and roll gap pressure is 4.0MPa, and roller speed is 30r/min, and roll gap is 3mm.After high-pressure roller mill idle running is normal, the rotating speed 0.25m/s of setting feeding belt, the rotating speed 300r/min of V-type rotor of powder separator, the rotating speed 1000r/min of dust-precipitator, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, and then feeds in floatation equipment, first add diesel oil 300g/t and kerosene 100g/t and stir 3min, then add methyl isobutyl carbinol 60g/t and stir 1min, carry out roughly selecting 3min, obtain thick cleaned coal; Then add diesel oil 150g/t and kerosene 50g/t and stir 3min; Add methyl isobutyl carbinol 30g/t again and stir 1min, carry out once purging selection 3min; Primary blank carried out to thick cleaned coal selected, obtain cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select.
The productive rate of cleaned coal is 58.70%, and ash content is 6.72%; The productive rate of tail coal is 41.30%, and ash content is 43.33%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 0.97%, and ash content reduces by 1.12%.
embodiment 4
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 50mm, and ash content is 26.03%.Carry out flotation after adopting high pressure roller final grinding system centering coal dust mill, processing step is as follows:
(1) in, coal adopts jaw crusher to carry out fragmentation, and the products application sieve aperture after fragmentation is that the sieve of 20mm sieves, and on-the-sieve material turns back to jaw crusher and carries out fragmentation, and undersize material enters feed bin;
(2) arrange the running parameter of high-pressure roller mill, high pressure roller is pulverized and is opened a way completely, and roll gap pressure is 4.2MPa, and roller speed is 30r/min, and roll gap is 2mm.After high-pressure roller mill idle running is normal, the rotating speed 0.5m/s of setting feeding belt, the rotating speed 400r/min of V-type rotor of powder separator, the rotating speed 2000r/min of dust-precipitator, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, and then feeds in floatation equipment, first add diesel oil and stir 500g/t3min, then add terpenic oil 100g/t and stir 1min, carry out roughly selecting 3min, obtain thick cleaned coal; Then add diesel oil 200g/t and stir 3min, then add terpenic oil 40g/t stirring 1min, carry out once purging selection 3min; Primary blank carried out to thick cleaned coal selected, obtain cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select.
The productive rate of cleaned coal is 55.44%, and ash content is 9.53%; The productive rate of tail coal is 44.56%, and ash content is 46.56%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 1.32%, and ash content reduces by 0.48%.
embodiment 5
Middle coal is coal in the washing of thermal coal coal washery, and granularity is less than 200mm, and ash content is 24.86%.Carry out flotation after adopting high pressure roller final grinding system centering coal dust mill, processing step is as follows:
(1) in, coal adopts gyratory crusher to carry out fragmentation, and the products application sieve aperture after fragmentation is that the sieve of 50mm sieves, and on-the-sieve material turns back to gyratory crusher and carries out fragmentation, and undersize material enters feed bin;
(2) arrange the running parameter of high-pressure roller mill, high pressure roller pulverized zone rim charge circulates, and roll gap pressure is 5.5MPa, and roller speed is 10r/min, and roll gap is 5mm.After high-pressure roller mill idle running is normal, the rotating speed 1.0m/s of setting feeding belt, the rotating speed 500r/min of V-type rotor of powder separator, the rotating speed 3000r/min of dust-precipitator, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, and then feeds in floatation equipment, first add kerosene 1000g/t and stir 3min, then add terpenic oil 100g/t and stir 1min, carry out roughly selecting 3min, obtain thick cleaned coal; Then add kerosene 500g/t and stir 3min, then add terpenic oil 50g/t stirring 1min, carry out once purging selection 3min; Primary blank carried out to thick cleaned coal selected, obtain cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select.
The productive rate of cleaned coal is 58.94%, and ash content is 8.89%; The productive rate of tail coal is 41.06%, and ash content is 47.78%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 2.44%, and ash content reduces by 0.38%.
Claims (2)
1. the whole grinding of the high pressure roller of coal and a method for separating in, is characterized in that carrying out according to following steps:
(1) middle coal is crushed to below the mill feed size being suitable for high pressure roller final grinding system; Middle coal disintegrating apparatus selects jaw crusher, gyratory crusher or high-pressure roller mill; The mill feed size of high pressure roller final grinding system is 10 ~ 50mm;
(2) arrange the running parameter of high-pressure roller mill: high pressure roller mill technique is opened a way completely or is with rim charge to circulate, roll gap pressure is 3 ~ 6MPa, and roller speed is 10 ~ 30r/min, and roll gap is 2 ~ 5mm; After high-pressure roller mill idle running is normal, the rotating speed of setting feeding belt is 0.25 ~ 1m/s, the rotating speed of V-type rotor of powder separator is 50 ~ 500r/min, the rotating speed of dust-precipitator is 1000 ~ 3000r/min, then open conveying worm successively, material is fed high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjustment feeding belt rotating speed is equal with load to feeding coal;
(3) add water whole for high pressure roller ground prod stirring of sizing mixing, then feed in floatation equipment, first add collecting agent and stir 3min, the addition of collecting agent is 400 ~ 1000g/t, then add foaming agent and stir 1min, the addition of foaming agent is 40 ~ 100g/t, carries out roughly selecting 3 ~ 4min, obtains thick cleaned coal; Then add collecting agent and stir 3min, the addition of collecting agent is that 200 ~ 500g/t adds foaming agent stirring 1min again, and the addition of foaming agent is 20 ~ 50g/t, carries out once purging selection 3min; Primary cleaning 2min is carried out to thick cleaned coal, obtains cleaned coal; Scan cleaned coal and selected tail coal to mix to turn back to and roughly select; Collecting agent is that kerosene is or/and diesel oil; Foaming agent is terpenic oil, sec-octyl alcohol or methyl isobutyl carbinol.
2. the whole grinding of the high pressure roller of a kind of middle coal according to claim 1 and method for separating, is characterized in that, in described step (3), floatation equipment is flotation device or flotation column.
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| CN103962230B (en) * | 2014-04-28 | 2016-06-29 | 辽宁科技大学 | The method that the high pressure roller of a kind of gangue is pulverized and reclaimed coal |
| CN105032581A (en) * | 2015-07-09 | 2015-11-11 | 金堆城钼业股份有限公司 | Smashing and classifying technology for molybdenite |
| CN105797831B (en) * | 2016-03-22 | 2018-03-09 | 中国矿业大学 | Technique is selected in the dissociation of coal again in a kind of coking end |
| CN108262139B (en) * | 2018-03-22 | 2021-02-02 | 山西能源学院 | Crushing method for coal mining |
| CN111136086A (en) * | 2019-12-27 | 2020-05-12 | 西南科技大学 | Method and device for reducing coking coal ash content through steam jet controlled dissociation |
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| CN102861663A (en) * | 2012-10-08 | 2013-01-09 | 中国矿业大学 | Breaking grinding dissociation and re-flotation two-stage recovery process of coal in scarce coking |
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