CN103041926A - Flotation process method of high-ash-content fine coal slime - Google Patents
Flotation process method of high-ash-content fine coal slime Download PDFInfo
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- CN103041926A CN103041926A CN2013100342822A CN201310034282A CN103041926A CN 103041926 A CN103041926 A CN 103041926A CN 2013100342822 A CN2013100342822 A CN 2013100342822A CN 201310034282 A CN201310034282 A CN 201310034282A CN 103041926 A CN103041926 A CN 103041926A
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Abstract
The invention relates to a flotation process method of high-ash-content fine coal slime. According to the method, pre-desliming is carried out by using a flotation coal slime flotation feeding desliming pond invented by Tangshan Guohua Technology International Engineering Co., Ltd., preprocessing is carried out by using a pulverization drop-type coal slurry preprocessor, and rough flotation and fine flotation are carried out by using an air jet flotation machine. The method comprises the following steps of: pre-desliming; preprocessing of the coal slurry; controlling of the feeding concentration of the flotation machine; and dehydration and recycling. According to the flotation process method of the high-ash-content fine coal slime, coking clean coal is sorted from inferior coal slime, the flotation process method is scientific and optimized, perfect indexes of sorting are substantially improved, the outward discharging of slime water is thoroughly avoided, the closed cycle of washing water of a coal cleaning plant is realized, and the method is scientific and environment-friendly.
Description
Technical field
The present invention relates to a kind of method for floating of coal slime, particularly relate to a kind of floatation process method of high ash content fine coal slurry.
Background technology
The dunn bass that mixes in the feed coal of coal preparation plant is met the broken loose argillization of water soaking in coal slurry flotation in the wet coal preparation process, and accumulates in＜the 0.03mm(500 mesh) fine coal slurry in.This coal slime has two characteristics:
1, high, the fine size of ash content, the coal slurry flotation ash content is up to 42%, and the floating tail-coal of some coal preparation plant of China is also with regard to forties percent.The thin mud of＜0.03mm has almost accounted for 2/3, and ash content is up to 58.65%.
2. extremely difficult flotation
Thin mud is harmful to flotation and is mainly manifested in following:
A. the thin mud severe contamination of high ash content floatation clean coal makes its quality be difficult to guarantee.And operation is reclaimed in follow-up dehydration make a very bad impression.
B. thin mud non-selectivity occupy bubble surface, make the difficulty increase of general coal grain and bubble adhesion.
C. thin mud specific area is large, very easily adsorbs flotation agent, makes general coal grain can not obtain due flotation agent.
Because thin cement content is large in the coal slurry flotation, ash content is high again, the laboratory flotation experimental results of therefore carrying out according to present domestic relevant industries standard, the flotation speed curve of Pan's one coal preparation plant's coal slurry flotation of drawing as can be known, when cleans ash is 11.00%, clean coal yield only is 2.07%, the body rate of recovery that cleaned coal is flammable also only is 2.80%, belongs to utmost point difficult-to-float coal.
Be extremely difficult floating coal slime to the coal slime flotability rank, Recognition Applied in Coal Preparation System adopts and roughly selects again capable selected technological process of foam at present, Wang Feng hilllock coal preparation plant such as Huainan Mining Group is exactly that Fig. 3 is seen in this technological process, and its flow process is: the coal slurry preliminary treatment, roughly select, selected, dehydration reclaims.
Divide high situation for thin plaster in the coal slurry flotation, adopt the technological process of predictive desliming to see accompanying drawing 2, its flow process is: predictive desliming, coal slurry preliminary treatment, the recovery of roughly selecting, dewater.Huaibei Mining Group is faced and is melted coal preparation plant and adopt exactly this flow process to carry out flotation, utilizes the common apparatus-raker thickener of water treatment to remove in advance the thin mud of small part, is roughly selected by flotation device again, can satisfy production requirement.
Above-mentioned flow process is for coal slime floatability extreme difference, and such as the coal slurry flotation of Pan one coal preparation plant, the thin mud amount of＜0.030mm is large, ash content is high again, adopt any one that has two kinds of technological processes now, all can not reach production target (floatation clean coal ash content≤11.00%, total tail coal ash content 〉=60%).
Be less than or equal to 40% the extremely difficult floating grade that is judged to be according to " coal floatability assessment method " flammable body rate of recovery, for the flotation of this difficult-to-float coal, still do not have at present preferably floatation process report.
Summary of the invention
Goal of the invention of the present invention is the character of the high coal slime inferior of floatability extreme difference, ash content that can not flotation for prior art, a kind of lectotype selection optimization, craft science are provided, and slime separation improves the floatation process method of the high ash content fine coal slurry that index increases substantially.
Realize above-mentioned purpose by the following technical solutions:
A kind of floatation process method of high ash content fine coal slurry, the method utilizes the coal slurry flotation of Tangshan state China scientific and technological international project Co., Ltd invention to carry out predictive desliming with floatation feed desliming pond, carry out preliminary treatment with atomized fall type coal paste preprocessor, and then roughly select with selected with air jet flotation machine, described method comprises the steps:
A. predictive desliming
The high ash content duff muddy water for the treatment of flotation is squeezed into floatation feed desliming pond with the floatation feed pump, with Frequency Converter Control floatation feed pump, the flow of floatation feed pump also is desliming pond underflow flow, adjust to the 40-80% of floatation feed desliming pond pan feeding flow, in floatation feed desliming pond, carry out desliming by the hydraulic classiciation effect, the parts of fine mud of general＜0.03mm removes, and the thin plaster that removes divides in 50% level;
B. coal slurry preliminary treatment
The floatation feed pump will input to through the coal slurry of predictive desliming in the atomized fall type coal paste preprocessor, carry out preliminary treatment toward atomized fall type coal paste preprocessor interior interpolation flotation agent and circulation dilution water, in the coal slurry thick, fine grained is different time of contact with the flotation agent mixing, with the concentration of peace and quiet recirculated water dilution coal slurry, specifically control parameter and be:
A. the pan feeding concentration of flotation device
Roughly selecting with selected coal-water fluid concentration is 80-50g/L, and the thinned water amount is a ton coal 4.5-5.5m
3/ h;
B. flotation agent addition
The flotation agent addition is pressed into floating dry coal slurry amount and calculates, and is 0.8-0.6kg/t;
C. flotation
This step select many air jet flotation machines roughly select respectively, selected, the steps include:
A. roughly select
Enter in the air jet flotation machine of roughly selecting usefulness through pretreated coal slurry, then roughly select, the unit are aeration quantity of roughly selecting the air jet flotation machine of usefulness is 0.3-0.5m
3/ m
2Min roughly selects the froth bed thickness last, two Room of the air jet flotation machine of usefulness and adjusts to 250-350mm, and the time of roughly selecting is 11.5-13.5 minute, and the unit volume treating capacity is≤5m
3/ m
3H, sub-elect ash content and be 14.20-15.30% roughly select cleaned coal and ash content is the tail coal of 65-75%;
B. selected
Roughly select cleaned coal with after the recirculated water dilution, send into selectedly with in the air jet flotation machine, selected unit are aeration quantity with air jet flotation machine is 0.3-0.5m
3/ m
2Min, selected froth bed thickness last, two Room with air jet flotation machine are 250-350mm, and the selected time is 14.5-16.5 minute, and the unit volume treating capacity is controlled at≤5m
3/ m
3H obtains the tail coal that selected foam and ash content are 50-60%;
D. dehydration is reclaimed
Selected foam reclaims with filter press or pressing filter dehydration, obtains cleaned coal and filtrate, and the floatation clean coal ash content of recovery is 10.00-11.00%.
As preferred version, the described coal-water fluid concentration of roughly selecting is diluted to 80-50g/L with recirculated water.
As preferred version, flotation agent is comprised of foaming agent and collecting agent, and both weight ratios are 1:4-1:3.
As preferred version, described foaming agent is that collecting agent is commercially available kerosene take carbon number 6-9 the fatty alcohol as the master.
As preferred version, in the floatation process 3-7mm is adjusted in the air intake duct cover plate gap of the inflating and stirring device of air jet flotation machine.
As preferred version, the tailing tank flashboard with air jet flotation machine in the floatation process is lowered to low level.
As preferred version, product and technic index after dehydration is reclaimed are: cleans ash 10.00-11.00%, and comprehensive tail coal ash content 〉=55%, index 〉=57% is improved in sorting, and whole floatation system desliming rate is 〉=63%.
Adopt technique scheme, the equipment that the present invention adopts Tangshan state China scientific and technological international project Co., Ltd to develop, lectotype selection is excellent, and by the hydraulic classiciation effect, general＜0.03mm parts of fine mud removes it with ascending current in floatation feed desliming pond.By converter technique, depending on the online desliming amount of adjusting flexibly of ature of coal situation.Use atomized fall type coal paste preprocessor, make thick, fine grained from the flotation agent of atomizing be arranged different mixing times of contact, it is long that coarse grain low ash coal mud mixes time of contact, impel their surface energies to form the oil film of sufficient intensity, it is short that the thin mud of high ash content mixes time of contact, avoids their invalid absorption flotation agent.
Carry out flotation with air jet flotation machine, effectively desliming is fallen ash, is guaranteed quality of cleaned coal, smooth operation, and index is stable, and the equipment wearability is good, can remain on for a long time under the optimum condition condition to work.
Floatation process methodological science of the present invention is optimized, and sorting is improved index and increased substantially, and has thoroughly stopped black water and has effluxed, and has realized Washing Water Close-Cycling in Preparation Plant, the methodological science environmental protection.
The present invention sub-elects coking coal cleans from coal slime inferior, meet the fundamental state policy of building a resource-conserving society.
Description of drawings
Fig. 1 is process chart of the present invention.
Fig. 2, Fig. 3 are the process charts of prior art.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Crucial part of the present invention has been to change the floatation process of prior art, first predictive desliming before the coal slurry preliminary treatment, adopted the technological process of predictive desliming and the selected combination of coal slime, the operate of the scientific and technological research and development of whole process selection state China has sub-elected up-to-standard high-quality coking coal cleans from high ash content colm.
The concrete technology step is seen Fig. 1
The coal slurry flotation that process of the present invention is selected Tangshan Guohua Technology Co., Ltd invention is with floatation feed desliming pond (number of patent application: 201210099180.4) carry out predictive desliming, with the atomized fall type coal paste preprocessor (patent No.: ZL201010033384.9) carry out preliminary treatment, and then with air jet flotation machine (patent No.: ZL200810054981.2) roughly select with selected, the operating procedure of the method is seen Fig. 1: by predictive desliming, coal slurry preliminary treatment, coal slime roughly select, the dehydration of selected and floatation clean coal reclaims five job steps and forms.
Dynamic flow embodiment:
In the production system of 570 tons of Pan one coal preparation plant hour sorting capability, high ash content duff muddy water (claiming again coal slurry flotation) enters FFDP type floatation feed desliming pond (state China science and technology is made and produced) and carries out hydraulic classiciation, floatation feed pump on-line control ascending current speed by converter technique control removes ash content at the parts of fine mud more than 50%.The coal slurry that the floatation feed pump will remove parts of fine mud more is transported to FCA type atomized fall type coal paste preprocessor (state China science and technology is made and produced), so that thick, fine grained has different mixing times of contact from the flotation agent of atomizing, and after adding peace and quiet recirculated water dilution coal-water fluid concentration, being assigned to FJCA type air jet flotation machine (state China science and technology make produce) carries out coal slime and roughly selects operation, sub-elect ash content and be 14.78% roughly select cleaned coal and ash content up to 71.21% tail coal, roughly selecting cleaned coal enters again FJCA type air jet flotation machine (state China science and technology is made and produced) and carries out the selected operation of coal slime after recirculated water dilution, getting rid of ash content by selected operation is 57.67% tail coal, and the floatation clean coal ash content that reclaims through the pressing filter dehydration is 10.66%.
Concrete operation step embodiment
First step predictive desliming
The high ash content duff muddy water for the treatment of flotation flows automatically in the material desliming pond, and by the hydraulic classiciation effect, general＜0.03mm parts of fine mud removes it with ascending current.With Frequency Converter Control floatation feed pump, the underflow flow of floatation feed pump is 400 m
3/ h is by converter technique, depending on the online desliming amount of adjusting flexibly of ature of coal situation.This equipment is reinforced concrete constructional work, has floatation feed buffering, two functions of desliming concurrently.Carrying out desliming by the hydraulic classiciation effect in floatation feed desliming pond, is that 56.79% thin mud removes in advance with ash content, and the desliming rate can reach 36.16%, and the thin mud of＜0.03mm amount of removing is 18.4t/h.
The preliminary treatment of second step coal slurry
To input to through the coal slurry of predictive desliming in the atomized fall type coal paste preprocessor, and add flotation agent in atomized fall type coal paste preprocessor, the flotation agent addition is pressed into floating dry coal slurry amount, is 0.70kg/t; Flotation agent is comprised of foaming agent and collecting agent, and both weight ratios are 3:1, and the foaming agent addition is 11.4kg/h, and the collecting agent addition is 34.2kg/h.Take carbon number 6-9 the fatty alcohol as the master, collecting agent is illuminating kerosene.In the atomized fall type coal paste preprocessor, thick, fine grained has different mixing times of contact from the flotation agent of atomizing, and it is long that coarse grain low ash coal mud mixes time of contact, impels their surface energies to form the oil film of sufficient intensity; It is short that the thin mud of high ash content mixes time of contact, avoids their invalid absorption flotation agent.
Then with the concentration of peace and quiet recirculated water dilution coal slurry, roughly selecting with selected thinned water amount all is 250m
3/ h; The pan feeding concentration of control flotation device is: roughly selecting with selected coal-water fluid concentration is 65g/L.
Three, the 4th step flotation
This step select the air jet flotation machine of the different number of chambers be FJCA20-5 type and FJCA20-4 type air jet flotation machine roughly select respectively, selected, the aeration quantity for guarantor unit's area in the floatation process is controlled at 0.4m
3/ m
2Min adjusts to 5mm with the air intake duct cover plate gap of flotation device inflating and stirring device.The tailing tank flashboard of air jet flotation machine is lowered to low level, then carries out flotation, the steps include:
A. roughly select
At first enter in the FJCA-5 type air jet flotation machine of roughly selecting usefulness through pretreated coal slurry, then roughly select, the unit are aeration quantity of roughly selecting the FJCA-5 air jet flotation machine of usefulness is 0.4m
3/ m
2Min roughly selects the froth bed thickness last, two Room of the FJCA-5 air jet flotation machine of usefulness and adjusts to 200-300mm, and the time of roughly selecting is 12.8 minutes, and the unit volume treating capacity is≤4m
3/ m
3H, sub-electing ash content and be 14.78% roughly select cleaned coal and ash content is 71.21% tail coal;
B. selected
Roughly select after cleaned coal concentration is diluted to 65g/L with recirculated water, send into selectedly with in the FJCA-4 type air jet flotation machine, the unit are aeration quantity of FJCA-4 type air jet flotation machine is 0.4m
3/ m
2Min, the froth bed thickness last, two Room of FJCA-4 type air jet flotation machine are 300mm, and the selected time is 15.5 minutes, and the unit volume treating capacity is controlled at≤4m
3/ m
3H obtains selected foam, and ash content is 57.67% tail coal;
The dehydration of the 5th step is reclaimed
Selected foam reclaims with filter press or pressing filter dehydration, obtains cleaned coal and filtrate, and the floatation clean coal ash content of recovery is 10.66%.
Product and technic index after dehydration is reclaimed are: cleans ash 10.66%, and productive rate 51.57%, comprehensive tail coal ash content 66.41%, productive rate 48.43%, index 59.42% is improved in sorting, and whole floatation system desliming rate is 64.96%.
Percentage of the present invention is percetage by weight.
Below by reference to the accompanying drawings the specific embodiment of the present invention is described; but these explanations can not be understood to limit scope of the present invention; protection scope of the present invention is limited by the claims of enclosing, and any change on claim of the present invention basis all is protection scope of the present invention.
Claims (7)
1. the floatation process method of a high ash content fine coal slurry, it is characterized in that: the method utilizes the coal slurry flotation of Tangshan state China scientific and technological international project Co., Ltd invention to carry out predictive desliming with floatation feed desliming pond, carry out preliminary treatment with atomized fall type coal paste preprocessor, and then roughly select with selected with air jet flotation machine, described method comprises the steps:
A. predictive desliming
The high ash content duff muddy water for the treatment of flotation is squeezed into floatation feed desliming pond with the floatation feed pump, with Frequency Converter Control floatation feed pump, the flow of floatation feed pump also is desliming pond underflow flow, adjust to the 40-80% of floatation feed desliming pond pan feeding flow, in floatation feed desliming pond, carry out desliming by the hydraulic classiciation effect, the parts of fine mud of general＜0.03mm removes, and the thin plaster that removes divides in 50% level;
B. coal slurry preliminary treatment
The floatation feed pump will input to through the coal slurry of predictive desliming in the atomized fall type coal paste preprocessor, carry out preliminary treatment toward atomized fall type coal paste preprocessor interior interpolation flotation agent and circulation dilution water, in the coal slurry thick, fine grained is different time of contact with the flotation agent mixing, with the concentration of peace and quiet recirculated water dilution coal slurry, specifically control parameter and be:
The pan feeding concentration of flotation device
Roughly selecting with selected coal-water fluid concentration is 80-50g/L, and the thinned water amount is a ton coal 4.5-5.5m
3/ h;
B. flotation agent addition
The flotation agent addition is pressed into floating dry coal slurry amount and calculates, and is 0.8-0.6kg/t;
C. flotation
This step select many air jet flotation machines roughly select respectively, selected, the steps include:
Roughly select
Enter in the air jet flotation machine of roughly selecting usefulness through pretreated coal slurry, then roughly select, the unit are aeration quantity of roughly selecting the air jet flotation machine of usefulness is 0.3-0.5m
3/ m
2Min roughly selects the froth bed thickness last, two Room of the air jet flotation machine of usefulness and adjusts to 250-350mm, and the time of roughly selecting is 11.5-13.5 minute, and the unit volume treating capacity is≤5m
3/ m
3H, sub-elect ash content and be 14.20-15.30% roughly select cleaned coal and ash content is the tail coal of 65-75%;
B. selected
Roughly select cleaned coal with after the recirculated water dilution, send into selectedly with in the air jet flotation machine, selected unit are aeration quantity with air jet flotation machine is 0.3-0.5m
3/ m
2Min, selected froth bed thickness last, two Room with air jet flotation machine are 250-350mm, and the selected time is 14.5-16.5 minute, and the unit volume treating capacity is controlled at≤5m
3/ m
3H obtains the tail coal that selected foam and ash content are 50-60%;
D. dehydration is reclaimed
Selected foam reclaims with filter press or pressing filter dehydration, obtains cleaned coal and filtrate, and the floatation clean coal ash content of recovery is 10.00-11.00%.
2. the floatation process method of high ash content fine coal slurry according to claim 1 is characterized in that, the described coal-water fluid concentration of roughly selecting is diluted to 80-50g/L with recirculated water.
3. the floatation process method of high ash content fine coal slurry according to claim 1 is characterized in that, flotation agent is comprised of foaming agent and collecting agent, and both weight ratios are 1:4-1:3.
4. according to claim 1 or the floatation process method of 3 described high ash content fine coal slurries, it is characterized in that, described foaming agent be take carbon number 6-9 as main fatty alcohol, collecting agent is commercially available kerosene.
5. the floatation process method of high ash content fine coal slurry according to claim 1 is characterized in that, in the floatation process 3-7mm is adjusted in the air intake duct cover plate gap of the inflating and stirring device of air jet flotation machine.
6. the floatation process method of high ash content fine coal slurry according to claim 1 is characterized in that, the tailing tank flashboard with air jet flotation machine in the floatation process is lowered to low level.
7. the floatation process method of high ash content fine coal slurry according to claim 1, it is characterized in that product and technic index after dehydration is reclaimed are: cleans ash 10.00-11.00%, comprehensive tail coal ash content 〉=55%, index 〉=57% is improved in sorting, and whole floatation system desliming rate is 〉=63%.
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| CN107952588A (en) * | 2016-10-14 | 2018-04-24 | 中国石油化工股份有限公司 | The technique that carbon is recycled in coal gasification lime-ash |
| CN109746125A (en) * | 2019-03-15 | 2019-05-14 | 中国矿业大学 | A kind of high ash fine slime sorting unit and method |
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