CN104722389B - Coal dissociation-is independently sized mixing-bulk flotation technique in a kind of particulate - Google Patents

Coal dissociation-is independently sized mixing-bulk flotation technique in a kind of particulate Download PDF

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CN104722389B
CN104722389B CN201510092808.1A CN201510092808A CN104722389B CN 104722389 B CN104722389 B CN 104722389B CN 201510092808 A CN201510092808 A CN 201510092808A CN 104722389 B CN104722389 B CN 104722389B
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coal
flotation
mixing
dissociation
tail
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CN104722389A (en
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桂夏辉
曹亦俊
张义
王大鹏
刘炯天
夏灵勇
佟顺增
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China University of Mining and Technology CUMT
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/04Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives

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Abstract

It independently sizes mixing-bulk flotation technique the invention discloses coal dissociation-in a kind of particulate, belong to coal slime flotation technical field, the technique is sized mixing operation, (2) roughing operation, (3) dehydration and selected operation, (4) sorting and desliming operation, (5) separation of coarse slime operation, (6) desliming operation and (7) grinding operation including (1).In the particulate of the present invention coal dissociation-independently size mixing-bulk flotation technological process is simple, small investment, energy consumption is low, and operating cost is few, efficiency of separation height and remarkable in economical benefits.

Description

Coal dissociation-is independently sized mixing-bulk flotation technique in a kind of particulate
Technical field
The present invention relates to coal slime flotation technical field more particularly to a kind of height ash difficult choosings more suitable for middle coal intergrowth Slime separation technique.
Background technology
With the continuous improvement of mechanical coal mining degree, coal resources gradually decrease, and China is selected in coal quality and is constantly deteriorated, high Grey difficult separation coal cement content also gradually increases, and is greatly challenged with purifying using bringing to efficiently separating for coal resources.It is high The grey main performance characteristic of difficult separation coal mud is that ash content is high, middle coal content is big, floatability is poor, and the outstanding problem faced in sorting is exactly Cleans ash is exceeded, and tail coal ash content is low.The grey difficult separation coal mud of height more than the general intermediate intergrowth of floatation process sorting is difficult to reach Ideal effect, if the middle grey coal slime that part is not dissociated is into cleaned coal, cleans ash is exceeded, and into tail coal, then tail coal ash content is low, Separating effect is not dissociated to be necessarily affected;If the problem of being dissociated to it, and having caused thin mud pollution aggravation, this is mainly The granularity of coal and spoil before ore grinding compared to all greatly reducing while middle coal dissociation, and high ash thin mud content is after grinding Also greatly increase, this part coal slime with when entering flotation together with float coal mud since the competitive Adsorption of thin mud makes it become the pollution of cleaned coal Must be even more serious, cleans ash is exceeded, not ideal enough separating effect when dissociation.
Scholar in the industry is annoying always about the high grey seriously polluted problem of difficult separation coal mud thin mud, and thin mud inhales the competition of medicament It is attached to exacerbate race slightly, while being easy to be entrained pollution cleaned coal, race slightly is difficult to improve always with the present situation for polluting and depositing.Many experts The different flotation characteristics of thick fine slime are appreciated, and are selected with particulate by flotation conditions optimization to increase the coarse grain rate of recovery Property reduce pollution, but ignore the pre- process of sizing mixing before flotation operation.If process intensification realizes medicament and particle by sizing mixing Selective absorption is slightly of great advantage with the thin mud pollution problem raising efficiency of separation for solving to run in floatation process.It is difficult for high ash Coal intergrowth content causes the problem of efficiency of separation difference to propose thin mud pollution after one kind can effectively solve the problem that ore grinding more in coal separation mud Thick serious simple and effective sorting process is run for promoting coal resources to clean using significant with flotation.
Invention content
The present invention intends to provide a kind of grder man that the grey difficult separation coal mud of the more height of middle coal intergrowth can effectively can be achieved Floating tail-coal coarse grain is fed the sorting of coarse slime system, middle product of coal ore grinding is dissociated by skill;It is solved simultaneously by reinforcing of sizing mixing The seriously polluted problem of thin mud in flotation after coal mill in routine provides a kind of inexpensive, simple for process, small investment, the efficiency of separation High, business efficiency significantly sorts high grey difficult separation coal bricklayer's's process.
The present invention adopts the following technical scheme that:
In the particulate of the present invention coal dissociation-independently size mixing-bulk flotation technique is as follows:
A, separation of coarse slime operation:By floating tail-coal coarse grain and coarse slime, granularity 2-0.25mm feeds spiral separating together Machine is carried out so that high grey coarse grain spoil is discharged, and light product feeds TBS sorting machines and obtains coarse coal slurry, thick middle coal slime, by floating tail-coal Coarse grain feeds separation of coarse slime system to recycle the unrenewable low grey coarse grain of flotation, while the high grey spoil of coarse grain is discharged, and will throw Ore grinding dissociates thick middle coal slime after tail and plug after dewatering, avoids the energy charge brought to low ash and high grey coarse grain ore grinding And the adverse effect to flotation, reduce the grey thin mud amount of height of coal-grinding generation;
B, it sizes mixing flotation operation:The granularity difference of ore pulp is dissociated to energy input of sizing mixing according to float coal mud ore pulp and middle coal is entered It is different require, will enter the m- time of sizing mixing when float coal mud is sized mixing by fully ensuring that is not less than 4min, to ensure flotation collector Abundant absorption on coal grain surface;Middle coal mine slurry is fed in multistage action of forced stirring size mixing equipment, and agitator arm linear velocity is not less than 6m/s keeps dissociation particulate and flotation collector fully dispersed in size mixing equipment, realizes effective suction of coal and collecting agent in particulate Attached, the float coal mud that enters after sizing mixing in advance feeds flotation device and is sorted to simplify flotation flowsheet together with coal in dissociation.
The present invention particulate in coal dissociation-independently size mixing-the specific method is as follows for bulk flotation technique:
(1) it sizes mixing operation:
It float coal mud will be entered is added to single hop impeller to size mixing agitator, the time of sizing mixing is not less than 4min, to ensure flotation collecting Abundant absorption of the agent on coal grain surface;Middle coal mine slurry is added in multistage action of forced stirring size mixing equipment, under the conditions of high intensity is sized mixing, Agitator arm linear velocity is not less than 6m/s;
(2) roughing operation:
Entering after float coal mud is mixed with middle coal dissociation particulate ore pulp by pipeline after sizing mixing in advance is given in flotation device, Floatation clean coal and floating tail-coal are obtained after flotation device sorts;
(3) dehydration and selected operation:
The gravity flow of flotation device floatation clean coal is dehydrated into screen bowl centrifuge, the wherein low grey coarse grain cleaned coal of recycling, Centrifuge filtrate enters sorting in selected floatation equipment-flotation column and obtains cleaned coal and tail coal, by selected reduction thin mud to cleaned coal Pollution, it is selected after cleaned coal ore pulp and tail coal enter follow-up dehydration, obtain tail coal mud;
(4) sorting and desliming operation:
Roughing tail coal passes through classifying cyclone and carries out thickening, classifying cyclone overflow and desliming screen with desliming screen respectively Backwater enters follow-up dehydration together with selected tail coal, obtains tail coal mud, and tail coal coarse grain feeds TBS sortings;
(5) separation of coarse slime operation:
By the dewatered tail coal coarse grain of desliming screen desliming and gravity treatment coarse slime, gravity treatment coarse slime granularity 2-0.25mm, one And spiral sorting is fed, spiral light product feeds TBS sorting machines, obtains spoil, thick middle coal slime and coarse coal slurry;It is coarse-fine Ore grinding dissociates after being used as product, thick middle coal slime to enter desliming operation after coal slime and the further dehydration of spoil;
(6) desliming operation:
The thick middle coal slime that TBS is sub-elected enters sieve bend and carries out desliming dehydration, and oversize enters grinding machine and dissociated, under sieve Water merges with particulate after mill returns to flotation operation of sizing mixing together;
(7) grinding operation:
Thick middle coal slime after being dehydrated desliming, which enters, grinds dissociation in coal pulverizer, grinding machine can be according to pan feeding property and dissociation Granularity requirements adjust the rotating speed 65%-85% of critical speed (working speed be), and the parts -0.074mm account for 40- in product after mill 50%, the middle coal after dissociation is pumped back into middle coal size mixing equipment and sizes mixing.
In step (1), enter float coal mud and middle coal ore grinding coal slime size mixing operation when, diesel oil or kerosene is added as flotation Collecting agent, dosage 100-300g/t.Ensure that into floating pulp density be 60-80g/L by adding water.
In step (3), dehydration and selected operation are adjusted according to cleans ash, then in flotation device floatation clean coal qualification It is not required to be dehydrated selected link.
The positive effect of the present invention is as follows:
The present invention is the coal slime floating process dissociated based on middle coal ore grinding.The recycling of row coarse grain, the particulate essence of progressing greatly floating to roughing Choosing is to reduce thin mud pollution;" plug " and " throwing tail " are realized in the coarse grain gravity treatment together with coarse slime after concentration is classified of roughing tail coal, The high grey particulate of roughing tail coal is directly as tail coal.Coal slime in gravity treatment is dissociated into ore grinding, avoids the coarse grain spoil in floating tail-coal Crushing with low grey coarse grain adversely affects flotation.The thinner middle coal dissociation coal slime of granularity is individually sized mixing simultaneously, is matched Strengthen rotating speed effect of sizing mixing with high-energy input, reaches the balance of desorption probability and collision probability and adsorbed with medicament with reinforcing particulate Selectivity;The floatation feed of coarse grain fully ensures that sizing mixing the time inhales medicament to strengthen it under certain speed conditions of sizing mixing Attached effect to improve the rate of recovery of coarse grain, in first Application the dissociation of coal ore grinding individually size mixing-bulk flotation technique realization centering coal The efficient separation of the grey difficult separation coal mud of the more height of intergrowth content.
Major advantage has:
A, roughing tail coal coarse grain is sorted, coal grinding dissociation in gravity treatment together with coarse slime, can be recycled by gravity treatment floating Unrenewable coarse grain, the high grey spoil of discharge coarse grain is selected to solve the problems, such as that it is thick to low ash and high ash that the while of running thick also avoids The energy charge that grain ore grinding is brought and the adverse effect to flotation reduce the grey thin mud amount of height that no differential grinding generates.
B, it is required to be equipped with cleaned coal ring selection section again according to cleans ash, by the dehydration of roughing cleaned coal screen bowl centrifuge After recycle low grey coarse grain, filtrate flotation column is selected to reduce pollution of the thin mud to cleaned coal.
C, the different requirements for being directed to float coal mud from the difference of the slime size after middle coal ore grinding and to energy input of sizing mixing, Matching is with different stirring size mixing equipments.Coarse grain ore pulp feeds single hop impeller and sizes mixing agitator, fully ensures that the time of sizing mixing with true Protect abundant absorption of the flotation collector in particle surface;Particulate ore pulp is fed in multistage action of forced stirring size mixing equipment, which sets There are three layers of agitator arm and speed of agitator is high, keep particulate ore pulp and flotation collector fully dispersed in size mixing equipment, realizes thin Effective absorption of beans mud and collecting agent.Medicament quality of adsorption is improved by the reinforcing for the process of sizing mixing, increases the rate of recovery of coarse grain With the selectivity of particulate.
D, the technological process is simple, small investment, and power consumption is small, and operating cost is low, compared with traditional floatation process, sorting effect Rate is high, remarkable in economical benefits.
Description of the drawings
Fig. 1 is the sorting process flow diagram of the present invention.
Fig. 2 be the present invention particulate in coal dissociation-independently size mixing the-installation drawing of bulk flotation technique.
In figure:A pan feedings size mixing coal in agitator, B size mixing agitator, C flotation devices, D tail coals buffer pool, E concentrate baffle-box, F is classified pan feeding pump, G screen-bowl centrifuges, H flotation columns, I bubble generators, J circulating pumps, K classifying cyclones, L high Coal pan feeding pump, 1 granularity are thicker in coal buffer pool, R in frequency sieve, M spirals, NTBS sorting machines, O sieve bends, P ball mills, Q Floatation feed ore pulp, 2 recirculated waters, 3 medicaments, 4 size mixing after thickness grain slurry mixture, 5 floatation clean coals, 6 floating tail-coals, 7 Cyclone overflow, 8 cyclone underflows, 9 high-frequency screen oversizes, 10 high-frequency screen backwaters, 11 coarse slimes, 12 light products, 13 coarse grain Spoil, 14 coarse coal slurries, 15 thick middle coal slimes, 16 sieve bend screenings, 17 sieve bend oversizes, 18 filtrates, 19 low grey coarse grain essences Coal, 20 selected cleaned coal ore pulps, 21 selected tail coals, 22 final head coal products, 23 final tail coals.
Specific implementation mode
The embodiment of the present invention is further described below in conjunction with the accompanying drawings:
Example:As shown in Figure 1, coal dissociation-is independently sized mixing-bulk flotation technique in the particulate of the present invention, according to entering float coal Mud ore pulp and middle coal dissociate pulp granularity difference and require the difference for energy input of sizing mixing, and will enter float coal mud and feed single hop impeller tune Agitator is starched, fully ensures that and sizes mixing the time (time of sizing mixing is not less than 4min) to ensure flotation collector in the abundant of coal grain surface Absorption;Middle coal mine slurry is fed in multistage action of forced stirring size mixing equipment, which is equipped with three layers of agitator arm and speed of agitator height (stirs Mix impeller linear velocity and be not less than 6m/s), keep dissociation particulate and flotation collector fully dispersed in size mixing equipment, realizes Bed for Fine Coal Effective absorption of mud and collecting agent should add appropriate recirculated water when sizing mixing according to concentration requirement.Entering after sizing mixing in advance is floating Coal slime is given to after being mixed by pipeline with middle coal dissociation particulate in flotation device, and floatation clean coal is obtained after flotation device sorts and is floated Select tail coal.When cleans ash is exceeded, flotation device flotation concentrate is fed into screen bowl centrifuge and is dehydrated, recycling is wherein Low grey coarse grain cleaned coal;Centrifuge filtrate then feeds sorting in selected floatation equipment (flotation column) and obtains cleaned coal and tail coal, selected Cleaned coal ore pulp afterwards enters follow-up dehydration with tail coal, this operation can be adjusted according to cleans ash, floating in flotation device Selecting can then be not required to be dehydrated selected link when cleaned coal qualification.Roughing tail coal carries out thickening by classifying cyclone and desliming screen, Classifying cyclone overflow enters follow-up dehydration with desliming screen backwater together with selected tail coal, and desliming screen desliming is dewatered Tail coal coarse grain feeds spiral sorting together with gravity treatment coarse slime (granularity 2-0.25mm), and spiral light product feeds TBS points Machine is selected, spoil, thick middle coal slime and coarse coal slurry are obtained.Coarse coal slurry and spoil enter further dehydration as product, TBS The thick middle coal slime sub-elected enters sieve bend and carries out desliming dehydration, and arc oversize, which enters, grinds dissociation, backwater in coal pulverizer Particulate size mixing equipment is pumped to the middle coal return after dissociation to size mixing.In particulate coal independently size mixing-bulk flotation technique compared to Clean coal yield 0.5% can be improved under the conditions of identical medicine consumes in conventional bulk flotation, reduces cleans ash 1.5%.
As shown in Fig. 2, the present invention independently size mixing-bulk flotation technique capital equipment include pan feeding size mixing agitator A, in Coal size mixing agitator B, flotation device C, tail coal buffer pool D, concentrate baffle-box E, classification pan feeding pump F, sedimentation-filtration dewatering centrifugal dehydration Machine G, flotation column H, bubble generator I, circulating pump J, classifying cyclone K, high-frequency screen L, spiral M, TBS sorting machine N, arc Shape sieves O, ball mill P, middle coal buffer pool Q, middle coal pan feeding and pumps R.The thicker floatation feed ore pulp 1 of granularity is in coarse grain single layer impeller tune It starches in agitator A, adds a certain amount of medicament 3 and fully ensured that under certain speed of agitator and sized mixing under the time of sizing mixing;Chats solution Particulate ore pulp 17 from after is pumped in multistage action of forced stirring size mixing equipment B, and adds a certain amount of medicament 3 in certain size mixing Between under ensure that height is sized mixing and make particulate ore pulp under rotating speed input and medicament is fully dispersed sizes mixing, the process of sizing mixing can add recirculated water 2 with Satisfaction is sized mixing and the concentration requirement of floatation process.Thickness grain ore pulp 1,17 after sizing mixing feeds flotation after mixing by pipeline It is sorted in machine C, obtains floatation clean coal 5 and floating tail-coal 6, flow to concentrate baffle-box E and tail coal buffer pool D certainly respectively.It is floating It selects cleaned coal 5 to feed and recycles low grey coarse grain cleaned coal 19 in screen-bowl centrifuge G, filtrate 18 feeds in flotation column H The selected selected cleaned coal ore pulp 20 that obtains enters follow-up dehydration with selected tail coal 21;Then when flotation device C cleans ash is up to standard Without being dehydrated to cleaned coal, selected operation, at this time concentrate 5 directly as final floatation clean coal to postorder processing.Tail coal ore pulp 6 It is pumped in classifying cyclone K and is classified after buffering, underflow 8 enters high-frequency screen L and carries out desliming dehydration, cyclone overflow 7 Enter subsequent job as tail coal with backwater 10.High-frequency screen oversize 9 is divided with coarse slime 11 into spiral M Choosing, obtains light product 12 and coarse grain spoil 13, light product further feed TBS sorting machines N sort to obtain coarse coal slurry 14 with slightly Middle coal slime 15.Coal slime 15, which enters the dewatered oversizes of sieve bend O 17 and feeds coal pulverizer O, in thick is ground dissociation, screenings 16 are pumped to multistage action of forced stirring size mixing equipment B with coal mixed ore pulp 18 in particulate after dissociation after buffer pool P bufferings sizes mixing.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace And modification, the scope of the present invention is defined by the appended.

Claims (3)

1. coal dissociation-is independently sized mixing-bulk flotation technique in a kind of particulate, it is characterised in that:A, separation of coarse slime operation:It will float It is 2mm-0.25mm to select tail coal coarse grain and coarse slime, granularity, feeds spiral together and carries out so that high grey coarse grain cash is discharged Stone, light product feed TBS sorting machines and obtain coarse coal slurry, thick middle coal slime, and floating tail-coal coarse grain is fed separation of coarse slime system To recycle the unrenewable low grey coarse grain of flotation, while high grey coarse grain spoil is discharged, spiral and TBS sorting machines will be passed through The thick middle coal slime ore grinding dissociation after dewatering after tail and plug is thrown in operation, is avoided and is brought to low ash and high grey coarse grain spoil ore grinding Energy charge and adverse effect to flotation, reduce the grey thin mud amount of height of coal-grinding generation;B, it sizes mixing flotation operation:According to Enter float coal mud ore pulp and middle coal dissociates difference requirement of the granularity difference to energy input of sizing mixing of ore pulp, float coal mud will be entered by filling Code insurance card when sizing mixing the m- time of sizing mixing be not less than 4min, to ensure abundant absorption of the flotation collector on coal grain surface;Middle coal solution It is fed in multistage action of forced stirring size mixing equipment from ore pulp, agitator arm linear velocity is not less than 6m/s, and dissociation particulate and flotation is made to catch Receipts agent is fully dispersed in size mixing equipment, realizes effective absorption of coal and collecting agent in particulate, enters float coal mud in after sizing mixing Coal dissociation ore pulp feeds flotation device and is sorted to simplify flotation flowsheet together;The specific method is as follows for the technique:
(1) it sizes mixing operation:It float coal mud will be entered is added to single hop impeller to size mixing agitator, the time of sizing mixing is not less than 4min, to ensure Abundant absorption of the flotation collector on coal grain surface;Middle coal dissociation ore pulp is added in multistage action of forced stirring size mixing equipment, high-strength Under the conditions of degree is sized mixing, agitator arm linear velocity is not less than 6m/s;
(2) roughing operation:Entering after float coal mud is mixed with middle coal dissociation ore pulp by pipeline after sizing mixing is given to flotation device In, obtain floatation clean coal and floating tail-coal after flotation device sorts;
(3) dehydration and selected operation:The gravity flow of flotation device floatation clean coal is dehydrated into screen bowl centrifuge, and recycling is wherein Low ash coarse grain cleaned coal, Centrifuge filtrate enter sorting in selected floatation equipment-flotation column and obtain cleaned coal and tail coal, subtracted by selected Few pollution of the thin mud to cleaned coal, it is selected after cleaned coal ore pulp with tail coal enter follow-up dehydration, after tailings dewatering processing To tail coal mud;
(4) sorting and desliming operation:Floating tail-coal passes through classifying cyclone and carries out thickening with desliming screen respectively, is classified eddy flow Device overflow enters follow-up dehydration with desliming screen backwater together with selected tail coal, obtains tail coal mud, floating tail-coal coarse grain is given Enter TBS sortings;
(5) separation of coarse slime operation:By the dewatered tail coal coarse grain of desliming screen desliming and coarse slime, tail coal coarse grain and coarse slime Granularity is 2-0.25mm, feeds spiral sorting together, and spiral light product feeds TBS sorting machines, obtain spoil, it is thick in Coal slime and coarse coal slurry;It is used as product, thick middle coal slime to enter desliming dehydration and make after coarse coal slurry and the further dehydration of spoil Ore grinding dissociates after industry;
(6) desliming operation:The thick middle coal slime that TBS is sub-elected enter sieve bend carry out desliming dehydration, oversize enter coal pulverizer into Row dissociation, backwater merges with particulate after mill returns to flotation operation of sizing mixing together;
(7) grinding operation:Thick middle coal slime after being dehydrated desliming, which enters, grinds dissociation in coal pulverizer, working speed is critical turn The 65%-85% of speed, the parts -0.074mm account for 40-50% in product after mill, and the middle coal after dissociation, which is pumped back into middle coal, sizes mixing Equipment flotation size mixing.
2. coal dissociation-is independently sized mixing-bulk flotation technique in particulate as described in claim 1, it is characterised in that:Step (1) In, enter float coal mud and middle coal dissociation ore pulp size mixing operation when, diesel oil or kerosene is added as flotation collector, dosage is 100-300g/t ensures that into floating pulp density be 60-80g/L by adding water.
3. coal dissociation-is independently sized mixing-bulk flotation technique in particulate as described in claim 1, it is characterised in that:Step (3) In, dehydration and selected operation are adjusted according to cleans ash, are then not required to be dehydrated selected ring in flotation device floatation clean coal qualification Section.
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