CN101690914B - Method for carrying out coal flotation by using coking water - Google Patents
Method for carrying out coal flotation by using coking water Download PDFInfo
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- CN101690914B CN101690914B CN2009100757256A CN200910075725A CN101690914B CN 101690914 B CN101690914 B CN 101690914B CN 2009100757256 A CN2009100757256 A CN 2009100757256A CN 200910075725 A CN200910075725 A CN 200910075725A CN 101690914 B CN101690914 B CN 101690914B
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Abstract
The invention relates to a method for carrying out coal flotation by using coking water, which comprises the following steps: firstly, using coking waste water after coking to carry out pretreatment, biochemical bacterial treatment, color removing treatment and cyanogen removing treatment to obtain biochemical clean coking water; using the biochemical clean coking water to carry out coal flotation; using kerosene as a collecting agent and 2-octanol as a foaming agent, and stirring, blowing and foaming, sucking for filtering and drying to obtaining a clean coal product separated by the biochemical clean coking water. Although the chemical composition of the coal separated by the biochemical clean coking water has slight change, the industrial application can not be influenced. The coking water is used for separating coal, thus the clean tap water is saved, the environmental pollution is lowered, and the coal separating cost is reduced. The method of the invention enables the clean tap water to form a coking-coal separation reused cycle, is a very ideal method for carrying out coal flotation by using coking water, and is also a good technology for recycling water resources.
Description
Technical field
The present invention relates to a kind ofly carry out the method for coal floatation, belong to the technical field of wastewater treatment, coal floatation, coal washing with coking water.
Background technology
Coal is a kind of mixture, contains chemical substances such as carbon, hydrogen, oxygen, nitrogen, sulphur, phosphorus, in commercial Application; Usually to carry out washing to raw coal; The most frequently used method is that medium carries out washing with water exactly, and the washing of coal is the closed cycle of wash water, and the cleaning of water is the key link of coal separation; The first-selection of coal separation water is a clean water, i.e. running water.
Because the washing of coal is a huge Industrial Engineering, with ten thousand tons of calculating, so the clean water yield that coal separation consumes is huge; The coal separation water had both consumed a large amount of clean waters; Cause huge water resource waste again, the cost of industrial coal is significantly risen, also polluted environment.
Coal coking is the refining sublimation process of coal, in process of coking, also will consume a large amount of clean waters; Thereby the generation coking chemical waste water, the coking chemical waste water complicated component contains multiple poisonous, the harmful substance that is difficult to degrade; For example phenol, phosphide, cyanide, sulfide etc.; If these waste water efflux, not only can cause the ambient water body pollution, also can cause the water resource serious waste.
How handling coking chemical waste water, be used for coal separation then, form the round-robin of clean water, kill two birds with one stone, is a crucial scientific research task.
Summary of the invention
Goal of the invention
The object of the invention is exactly to disadvantages of background technology, and the coking chemical waste water that coal coking is produced carries out biochemical treatment, generates biochemical water; Be clean coking water; Carry out coal floatation with clean coking water, coking water is fully used, to practice thrift the clean water resource; Reduce and pollute, reduce the coal separation cost.
Technical scheme
The chemical substance material that the present invention uses is: raw coal, coking water, bodied ferric sulfate, sodium phosphate, soda ash, nitrite bacteria, nitrate bacteria, denitrifying bacteria, kerosene, secondary octanol, activated carbon, clorox, its combination consumption is following: with gram, kilogram, milliliter, be upgraded to measurement unit
Raw coal: C 100kg
Coking water: H
2O 2000L
Bodied ferric sulfate: [Fe
2(OH) (SO
4)
2.5]
1000.5kg
Sodium phosphate: NaH
2PO
40.6kg
Soda ash: Na
2CO
31kg
Nitrite bacteria: 60g
Nitrate bacteria: 60g
Denitrifying bacteria: 70g
Kerosene: CH
3(CH
2)
10CH
30.12kg
Secondary octanol: CH
3COH (CH
2)
5CH
30.01kg
Activated carbon: C 2kg
Clorox: NaClO 0.1kg
It is following to carry out the coal floatation method with coking water:
(1) handles coking water
1) preprocessing coking water
1. coking water 2000L is got into coking tank, oil interceptor, oil slick pond, regulating reservoir, temperature adjustment pond, biochemical blast pool successively through pipeline;
2. in regulating reservoir, add coagulant polymeric ferric sulfate 0.5kg;
3. temperature adjustment pond temperature is controlled at 25-35 ℃;
4. biochemical blast pool temperature is 25-35 ℃:
2) biochemical treatment coking water
1. biochemical treatment is carried out in blast pool;
2. in biochemical blast pool, add successively: nitrite bacteria 60g, nitrate bacteria 60g, denitrifying bacteria 70g;
3. intermittently stir with agitator, intermittently, mixing time is 10min;
4. in blast pool, import steam, input speed 100cm
3/ min, input time 20min;
5. in blast pool, intermittently be blown into air, be blown into speed 100cm with blower fan
3/ min, intermittently, blow-time is 10min;
6. in blast pool, add soda ash 1kg, the acidity-basicity ph value is 8 in the adjustment pond, meta-alkalescence;
7. in blast pool, add bacteriotrophy material sodium phosphate 0.6kg, to replenish P elements deficiency in the coking water, the sodium phosphate input amount is 0.6kg, evenly throws in;
8. leave standstill, biochemical treatment 1440min;
3) subsequent treatment coking water
1. add and remove toner activated carbon 2kg, evenly stir, remove look and handle;
2. add and remove cyanogen agent clorox 0.1kg, evenly stir, remove cyanogen and handle;
3. after removing look, removing cyanogen and handle, the blast pool internal upper part is a coking water, and the bottom is a mud;
4. coking water is evacuated in the storage tank, supplies the coal separation coal washing to use, mud is outwelled, and coking this moment water is: biochemical clean coking water;
(2) with biochemical clean coking water coal floatation
1) raw coal 100kg is placed in the flotation cell;
2) add biochemical clean coking water 1000L;
3) preparation kerosene+secondary octanol mixed liquor and adding
Get collecting agent kerosene 0.12kg;
Get the secondary octanol 0.01kg of foaming agent;
Mix and stir in the back adding flotation cell;
4) open mixer, mixer is done the both forward and reverse directions uniform rotation, and the mixer revolution is 1800r/min;
5) open air compressor, input air in flotation cell, input speed 200cm
3/ min;
6) strike off the top bubble that swims with scraping the bubble device;
7) under mixer stirs, under 20 ℃ of normal temperature, under the compressed air input state, under collecting agent kerosene, the secondary octanol effect of foaming agent, raw coal is selected, and time 20min becomes coal slurry;
8) after the flotation, by drawing liquid pump coal slurry is evacuated in the suction filtration bucket, carries out suction filtration, retain cleaned coal on the filter screen in the suction filtration bucket, that is: the coal separation product is retained suction filtration waste water, i.e. coal preparation waste water in the suction filtration case;
(3) the dry cleaned coal of drying box
The cleaned coal of selecting is placed rustless steel container, places drying box to carry out drying then, 75 ℃ of baking temperatures, drying time 200min;
Be end product after the drying: cleaned coal
(4) detect, chemically examine, analyze, characterize, contrast
To with the cleaned coal after the flotation of biochemical clean coking water, carry out pattern, color and luster, chemical composition detection, chemical examination, analyze, characterize, contrast;
Carry out chemical composition analysis with industrial analysis instrument;
(5) cleaned coal stores
Cleaned coal to the flotation of biochemical clean coking water is stored in cool place, dry environment, waterproof, protection against the tide, anti-oxidation, acid-proof alkali salt erosion, 20 ℃ ± 3 ℃ of storage temperatures, relative humidity≤20%.
The biochemical treatment of described coking water is carried out in blast pool; Earlier coking water is placed coking pond 1, in water intaking valve 9, water inlet pipe 47 input oil interceptors 2, leave standstill, get into oil slick pond 3 then and leave standstill; Getting into regulating reservoir 4 then leaves standstill; Get into 5 temperature adjustments of temperature adjustment pond then, temperature transfers to 25-35 ℃, imports blast pool 6 then and carries out biochemical treatment; Blast pool 6 is square groove shape, and pond, top lid 53 is provided with loading hopper 8, mixer 48, blower fan 54, steam engine 7, steam pipe 20, and gos deep in the blast pool 6; Addition funnel 8 adds nitrite bacteria 16, denitrifying bacteria 17, nitrate bacteria 18, soda ash 46, sodium phosphate 19 in blast pool 6, blast pool 6 is interior by steam 15 fillings, mobile, and carries out biochemical reaction; Biochemical water behind the biochemical reaction removes look pond 11 by outlet pipe 10 inputs and carries out activated carbon except that the look processing; Except that input behind the look removes cyanogen pond 12, carry out clorox and remove the cyanogen processing, except that the coking water behind the cyanogen gets into biochemical clean coking pond 13; And, in the pond 13 be: biochemical clean coking water by outlet valve 14 controls.
The clean coking water of described biochemistry coal floatation; In flotation cell, carry out; Water in the biochemical clean coking water tank 21 are by in water intaking valve 23, the water inlet pipe 24 input flotation cells 22, and flotation cell 22 inner bottom parts add raw coal 37, and flotation cell 22 upper slots lid 40 is provided with two-way mixer 25, charging box 26; Charging box 26 is provided with kerosene case 49, secondary octanol case 50, agitator 51, and kerosene+secondary octanol mixed liquor 52 stirs the back by in the woven hose 39 input flotation cells 22; Flotation cell 22 lower left quarters are provided with air compressor 27, intake valve 28, air inlet pipe 29, after charging box 26 adds collecting agent kerosene, the secondary octanol of foaming agent, and air compressor 27 input compressed air 42, flotation cell 22 internal upper parts are bubble 41; Flotation cell 22 right lower quadrants are provided with drawing liquid pump 32, liquid valve 30, drain pipe 31; And UNICOM's woven hose 33, woven hose 33 is aimed at suction filtration bucket 34, is provided with filter screen 44 in the suction filtration bucket 34; Filter screen 44 tops are cleaned coal 38; Suction filtration bucket 34 UNICOM's suction filtration casees 36, suction filtration case 36 UNICOM's liquid suction pipes 45, drawing liquid valve 53, suction filter pump 35 are waste water 43 in the suction filtration case 36.
Beneficial effect
The present invention compares with background technology has tangible advance, and it is with the coking chemical waste water after the coking, carries out preliminary treatment, biochemical bacterial treatment, follow-up except that look, except that the cyanogen processing earlier, processes biochemical clean coking water; Utilize biochemical clean coking water to carry out coal floatation, use collecting agent kerosene, the secondary octanol of foaming agent, through stirring, be blown into compressed air; Carry out suction filtration then, after drying, obtain the product cleaned coal that goes out with biochemical clean coking wet concentration, the coal that goes out with biochemical clean coking wet concentration; Though chemical composition has trace to change, and does not influence industrial applications, uses the coking chemical waste water coal separation; Promptly practice thrift clean tap water, reduced waste, reduced environmental pollution again; Having reduced the coal separation cost, made clean tap water form the multiplexing circulation of coking-coal separation, is the reutilization technology of very good water resource.
Description of drawings
Fig. 1 is aquaticization of coking treatment state figure
Fig. 2 is the state diagram of biochemical clean coking water coal floatation
Fig. 3 is clean water coal separation, biochemical clean coking wet concentration coal product chemical composition contrast table
Shown in the figure, list of numerals is following:
1, coking pond, 2, oil interceptor, 3, the oil slick pond, 4, regulating reservoir, 5, the temperature adjustment pond, 6, blast pool, 7, steam engine; 8, loading hopper, 9, water intaking valve, 10, outlet valve, 11, remove the look pond, 12, remove the cyanogen pond, 13, biochemical clean coking pond, 14, outlet valve; 15, steam, 16, nitrite bacteria, 17, denitrifying bacteria, 18, nitrate bacteria, 19, sodium phosphate, 20, steam pipe, 21, biochemical clean coking water tank; 22, flotation cell, 23, water intaking valve, 24, water inlet pipe, 25, mixer, 26, charging box, 27, air compressor, 28, intake valve; 29, air inlet pipe, 30, liquid valve, 31, drain pipe, 32, drawing liquid pump, 33, woven hose, 34, the suction filtration bucket, 35, suction filter pump; 36, suction filtration case, 37, raw coal, 38, cleaned coal, 39, woven hose, 40, the groove lid, 41, bubble, 42, compressed air; 43, waste water, 44, filter screen, 45, liquid suction pipe, 46, soda ash, 47, water inlet pipe, 48, mixer; 49, kerosene case, 50, secondary octanol case, 51, agitator, 52, kerosene+secondary octanol mixed liquor, 53, the drawing liquid valve, 54, blower fan.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified:
Shown in Figure 1, be aquaticization of coking treatment state figure, each pond, groove mutual alignment, connecting relation want correct, install firmly.
Carry out preliminary treatment before aquaticization of the coking bacterial treatment earlier, regulate control oil slick temperature etc., remove look after the biochemical treatment, remove the cyanide processing, be prepared into biochemical water then, promptly biochemical clean coking water.
Nitrate bacteria, nitrite bacteria, denitrifying bacteria, viable bacteria rate are 96%, are food with the sodium phosphate.
Biochemical bacterial treatment coking water principle:
In the coal gas pond, contain very strong bacterium of a large amount of activity and microbiologic population, suspension in they and the sewage and colloid are formed suspension-microorganism coexistence body, and its flocculability and adhesive force strengthen greatly; When such sewage with after the mud of backflow mixes, flocculation and absorption take place each other, at this moment, the suspension-colloid of difficult degradation obtains flocculating, adsorbing, cohere, after sedimentation with separated form water; When preliminary treatment, activated sludge has biodegradation to a part of dissolved organic matter, and the clearance to some harmful substances is much higher than preliminary sedimentation tank like this; Also, make non-biodegradation rate raising in the whole technology, make the water quality stabilizing of biochemical treatment, and load is lower just because of preliminary treatment.
Shown in Figure 2, be the state diagram of the clean coking water of biochemistry coal floatation, each location, connecting relation want correct, install firmly.
Flotation cell is square or the rectangle cell body, make with corrosion resistant plate, and collecting agent kerosene, the secondary octanol of foaming agent want dosage to mix use.
It is sufficient that compressed air is wanted, and mixer will stir at the uniform velocity positive and negative rotation.
Biochemical clean coking water coal floatation principle:
Coal floatation is according to the different slime separations of particle surface wetability; When adding the hydrocarbon-type oil collecting agent in the ore pulp, the surface tension between coal grain and oil molecule is less than the surface tension between coal grain and hydrone, so hydrocarbon-type oil can form hydrophobic oil film at coal grain unfolded surface, the hydrophobicity on raising coal grain surface; And spoil has very strong hydrophily, is prone to covered by hydrone, and hydro carbons can not be in the spoil surface adsorption; Therefore the adding of collecting agent has enlarged coal grain and spoil wetting of surfaces gender gap, impels sorting to carry out smoothly; Foaming agent can concentrate at gas-liquid interface, and on the interface, forms and align, and points to water with polar end, and non-polar end points to gas; Because polarity and the hydrone of polar end are had an effect, form one deck hydration shell at bubble surface, hindered the merger of bubble, impel air dispersion, thereby form little bubble, and can increase and resist that external force does that the time spent is out of shape and the ability of breaking; Coal grain surface wettability is poor, adheres to during collision on the bubble, is brought to the water surface by bubble, forms mineralized froth; The spoil surface wettability is good, does not adhere to bubble during collision, still stays in the ore pulp; Foam and ore pulp are discharged respectively, can obtain cleaned coal and tail coal.
The value of the chemical substance material that the coal floatation of the biochemical treatment of coking water, biochemical clean coking water is used, biochemical bacterium etc. is to confirm by the optimum range that is provided with in advance.
Shown in Figure 3, be clean water coal separation and biochemical clean coking wet concentration coal product chemical composition contrast table, visible in the table, the coal chemistry composition that biochemical clean water is selected has trace to change, and when industrial applications, can handle to the difference of element.
Claims (3)
1. method of carrying out coal floatation with coking water; It is characterized in that: the chemical substance material of use is: raw coal, coking water, bodied ferric sulfate, sodium phosphate, soda ash, nitrite bacteria, nitrate bacteria, denitrifying bacteria, kerosene, secondary octanol, activated carbon, clorox, its combination consumption is following: with gram, kilogram, milliliter, be upgraded to measurement unit
Raw coal: 100kg
Coking water: 2000L
Bodied ferric sulfate: 0.5kg
Sodium phosphate: 0.6kg
Soda ash: 1kg
Nitrite bacteria: 60g
Nitrate bacteria: 60g
Denitrifying bacteria: 70g
Kerosene: 0.12kg
Secondary octanol: 0.01kg
Activated carbon: 2kg
Clorox: 0.1kg
It is following to carry out the coal floatation method with coking water:
(1) handles coking water
1) preprocessing coking water
1. coking water 2000L is got into coking pond, oil interceptor, oil slick pond, regulating reservoir, temperature adjustment pond, biochemical blast pool successively through pipeline;
2. in regulating reservoir, add coagulant polymeric ferric sulfate 0.5kg;
3. temperature adjustment pond temperature is controlled at 25-35 ℃;
4. biochemical blast pool temperature is 25-35 ℃;
2) biochemical treatment coking water
1. biochemical treatment is carried out in blast pool;
2. in biochemical blast pool, add successively: nitrite bacteria 60g, nitrate bacteria 60g, denitrifying bacteria 70g;
3. intermittently stir with agitator, intermittently, mixing time is 10min;
4. in blast pool, import steam, input speed 100cm
3/ min, input time 20min;
5. in blast pool, intermittently be blown into air, be blown into speed 100cm with blower fan
3/ min, intermittently, blow-time is 10min;
6. in blast pool, add soda ash 1kg, the acidity-basicity ph value is 8 in the adjustment pond, meta-alkalescence;
7. in blast pool, add bacteriotrophy material sodium phosphate 0.6kg, to replenish P elements deficiency in the coking water, the sodium phosphate input amount is 0.6kg, evenly throws in;
8. leave standstill, biochemical treatment 1440min;
3) subsequent treatment coking water
1. add and remove toner activated carbon 2kg, evenly stir, remove look and handle;
2. add and remove cyanogen agent clorox 0.1kg, evenly stir, remove cyanogen and handle;
3. after removing look, removing cyanogen and handle, the blast pool internal upper part is a coking water, and the bottom is a mud;
4. coking water is evacuated in the storage tank, supplies the coal separation coal washing to use, mud is outwelled, and coking this moment water is: biochemical clean coking water;
(2) with biochemical clean coking water coal floatation
1) raw coal 100kg is placed in the flotation cell;
2) add biochemical clean coking water 1000L;
3) preparation kerosene and secondary octanol mixed liquor
Get collecting agent kerosene 0.12kg;
Get the secondary octanol 0.01kg of foaming agent;
Mix and stir in the back adding flotation cell;
4) open mixer, mixer is done the both forward and reverse directions uniform rotation, and the mixer revolution is 1800r/min;
5) open air compressor, input air in flotation cell, input speed 200cm
3/ min;
6) strike off the top bubble that swims with scraping the bubble device;
7) under mixer stirs, under 20 ℃ of normal temperature, under the compressed air input state, under collecting agent kerosene, the secondary octanol effect of foaming agent, raw coal is selected, and time 20min becomes coal slurry;
8) after the flotation, by drawing liquid pump coal slurry is evacuated in the suction filtration bucket, carries out suction filtration, retain cleaned coal on the filter screen in the suction filtration bucket, that is: the coal separation product is retained suction filtration waste water, i.e. coal preparation waste water in the suction filtration case;
(3) the dry cleaned coal of drying box
The cleaned coal of selecting is placed rustless steel container, places drying box to carry out drying then, 75 ℃ of baking temperatures, drying time 200min;
Be end product after the drying: cleaned coal
(4) detect, chemically examine, analyze, characterize, contrast
To with the cleaned coal after the flotation of biochemical clean coking water, carry out pattern, color and luster, chemical composition detection, chemical examination, analyze, characterize, contrast;
Carry out chemical composition analysis with industrial analysis instrument;
(5) cleaned coal stores
Cleaned coal to the flotation of biochemical clean coking water is stored in cool place, dry environment, waterproof, protection against the tide, anti-oxidation, acid-proof alkali salt erosion, 20 ℃ ± 3 ℃ of storage temperatures, relative humidity≤20%.
2. according to claim 1ly a kind ofly carry out the method for coal floatation with coking water, it is characterized in that: the biochemical treatment of described coking water is carried out in blast pool, earlier coking water is placed coking pond (1); In water intaking valve (9), water inlet pipe (47) input oil interceptor (2), leave standstill; Get into oil slick pond (3) then and leave standstill, get into regulating reservoir (4) then and leave standstill, get into temperature adjustment pond (5) temperature adjustment then; Temperature transfers to 25-35 ℃, imports blast pool (6) then and carries out biochemical treatment; Blast pool (6) is square groove shape; Top Chi Gai (53) is provided with loading hopper (8), mixer (48), blower fan (54), steam engine (7), steam pipe (20), and gos deep in the blast pool (6), and addition funnel (8) adds nitrite bacteria (16), denitrifying bacteria (17), nitrate bacteria (18), soda ash (46), sodium phosphate (19) in blast pool (6); Blast pool (6) is interior by steam (15) filling, mobile; And carrying out biochemical reaction, the biochemical water behind the biochemical reaction removes look pond (11) by outlet pipe (10) input and carries out activated carbon except that the look processing, except that input behind the look removes cyanogen pond (12); Carry out clorox and remove the cyanogen processing; Except that the coking water behind the cyanogen gets into biochemical clean coking pond (13), and, be biochemical clean coking water in pond (13) by outlet valve (14) control.
3. a kind of method of carrying out coal floatation with coking water according to claim 1; It is characterized in that: the clean coking water of described biochemistry coal floatation; In flotation cell, carry out; Water in the biochemical clean coking water tank (21) is by in water intaking valve (23), water inlet pipe (24) the input flotation cell (22), and flotation cell (22) inner bottom part adds raw coal (37), and flotation cell (22) upper slot lid (40) is provided with two-way mixer (25), charging box (26); Charging box (26) is provided with kerosene case (49), secondary octanol case (50), agitator (51), and kerosene+secondary octanol mixed liquor (52) stirs the back by in woven hose (39) the input flotation cell (22); Flotation cell (22) lower left quarter is provided with air compressor (27), intake valve (28), air inlet pipe (29), after charging box (26) adds collecting agent kerosene, the secondary octanol of foaming agent, and air compressor (27) input compressed air (42), flotation cell (22) internal upper part is bubble (41); Flotation cell (22) right lower quadrant is provided with drawing liquid pump (32), liquid valve (30), drain pipe (31); And UNICOM's woven hose (33), woven hose (33) is aimed at suction filtration bucket (34), is provided with filter screen (44) in the suction filtration bucket (34); Filter screen (44) top is cleaned coal (38); Suction filtration bucket (34) UNICOM's suction filtration case (36), suction filtration case (36) UNICOM's liquid suction pipe (45), drawing liquid valve (53), suction filter pump (35) are waste water (43) in the suction filtration case (36).
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|---|---|---|---|
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| CN101948221A (en) * | 2010-10-18 | 2011-01-19 | 上海应用技术学院 | Deep decolorization treatment method for biologically treated coking wastewater |
| CN102716813A (en) * | 2012-06-20 | 2012-10-10 | 太原理工大学 | Electrolytic flotation method for fine coal |
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Granted publication date: 20120704 Termination date: 20121014 |