CN102716813A - Electrolytic flotation method for fine coal - Google Patents

Abstract

The invention relates to an electrolytic flotation method for fine coal. A graphite anode tube, a stainless steel cathode channel and aluminum sulfate are used as electrolyte in an electrolytic flotation tank, octanol is used as a foaming agent in the flotation tank, kerosene is used as a collector in the flotation tank, electrolytic flotation is performed under the action of a direct-current electric field, and then bubble collection, sedimentation and drying are performed to obtain clean coal and tailing. The fine coal after electrolytic flotation is high in purity and low in water content and has fewer impurities, the yield of the clean coal is 95%, the ash content of the clean coal is 7.98%, the yield of the tailing is 5%, the ash content of the tailing is 70.52%, the clean coal and the tailing can be used as raw materials in pharmacy, fine chemical engineering and high value-added industry, and the electrolytic flotation method for the fine coal is perfect.

Description

A kind of electrolytic flotation method of fine coal

technical field

The invention relates to an electrolytic flotation method for fine-grained coal, which belongs to the technical field of fine-grained coal washing and application.

Background technique

Coal is a mixture that contains various chemical substances, such as carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus, etc. With the improvement of mechanized coal mining, the amount of fine-grained coal increases sharply. The requirements for coal are becoming more and more stringent, and the application range of coal is becoming more and more extensive. The application of some high value-added products, such as coal raw materials used in pharmaceuticals, fine chemicals, and chemical preparations, all have high coal indicators; on the other hand, It is necessary to control environmental pollution, so higher and higher requirements are put forward for clean coal technology. Therefore, fine coal must be washed first to meet the use requirements; flotation is one of the separation methods for fine coal, and is currently the The most effective method for selecting fine-grained coal, flotation plays an important role in the treatment of slime water, so it has been widely used.

Flotation is an important method for fine-grained coal separation. The flotation process is a complex physical and chemical process completed in a solid, liquid, and gas three-phase system. The first is the adjustment of particle interface properties, such as wettability, surface electrical properties 1. The adjustment of adsorption characteristics; the second is to use the change of the interaction between particles to adjust and control the dispersion and aggregation state of the particle system; the third is to act on the phase interface through appropriate physical fields, such as gas/liquid interface and liquid/liquid interface Realize particle sorting.

Contents of the invention

purpose of invention

The object of the invention is to adopt the electrolytic flotation method to wash the fine particle coal for the situation of the background technology, take aluminum sulfate as the electrolyzer, take 2-octanol as the foaming agent, take kerosene as the collector, in the electrolytic cell, flotation Fine-grained coal is washed in the selection tank, foam tank and sedimentation tank to greatly improve the recovery rate and quality of fine-grained coal.

Technical solutions

The chemical substance material used in the present invention is: fine-grained coal, aluminum sulfate, secondary octanol, kerosene, water, graphite tube, and its preparation consumption is as follows: take kilogram, liter, millimeter as unit of measurement

Fine coal: C ₆₅₉ H ₅₅₇ O ₇₂ N ₁₀ S ₅ P ₃ 100kg±0.1kg

Secondary octanol: C ₈ H ₁₈ O 0.049L±0.0001L

Kerosene: C ₂₂₅ H ₄₅₂ 0.1L±0.01L

Aluminum sulfate: Al ₂ (SO ₄ ) ₃ ·18H ₂ O 1kg±0.01kg

Water: _H2O 2000L±1L

Graphite tube: C φ300mm×50mm×500mm

The method of electrolytic flotation fine coal is as follows:

(1) Selection of chemical substances and materials

The chemical substances and materials used in coal preparation should be selected and controlled for quality and purity:

Fine coal: solid solid carbon content > 95%

Second-octanol: liquid liquid 96%

Kerosene: liquid liquid 96%

Aluminum sulfate: solid solid 99.5%

Graphite tube: solid solid carbon content > 99.9%

Water: Liquid Liquid 95%

(2) Preparation of electrolyte

Put 1kg±0.01kg of aluminum sulfate in a stainless steel container, add 10L of water, stir with a stirrer for 30min, and dissolve it into: 0.15mol/L aluminum sulfate aqueous solution;

(3) Electrolyzed fine coal

Electrolysis of fine-grained coal is carried out in an electrolytic cell under the action of a DC electric field and an electrolyte;

① The electrolytic cell is made of stainless steel, which is the cathode of the DC electric field, and a graphite tube is placed vertically in the middle of the electrolytic cell, and the graphite tube is the anode of the DC electric field;

② Add 100kg of fine coal into the electrolytic cell;

Add 1000L of water into the electrolytic cell;

Add 1L of 0.15mol/L aluminum sulfate aqueous solution into the electrolytic cell;

③ Turn on the stainless steel cathode power supply of the electrolytic cell;

Turn on the graphite tube anode power supply;

DC electric field working voltage 36V, current 0.5A;

④ Under the direct current electric field, the fine-grained coal is electrolyzed under the action of the electrolyte, and the electrolysis time is 15 minutes, and the coal slurry is formed after electrolysis;

(4) Flotation of fine coal

① Pump the electrolyzed coal slurry into the flotation cell, add collector kerosene 0.1L, add foaming agent 2-octanol 0.049L, and carry out flotation, and a foam layer will be generated in the flotation cell;

② Turn off the cathode and anode DC power supply;

③ Use a scraper to scrape out the foam layer, then pump the bubbles into the foam tank, and the sediment is clarified, and the sediment is clean coal;

(5) Concentration tank concentration

The remaining coal slurry after flotation is pumped to the concentration tank for concentration, and clear water is released after concentration, and the fine-grained coal after flotation is retained as tailing coal;

(6) Drying of clean coal and tailing coal

The clean coal and tailings after flotation are collected in ceramic containers respectively, and then placed in a drying oven to dry at a drying temperature of 75°C and a drying time of 120 minutes, and become clean coal and tailings after drying;

(7) Detection, analysis, characterization

Detect, analyze, and characterize the appearance, color, chemical composition, and chemical and physical properties of clean coal and tailing coal;

FTIR8400S infrared spectrometer was used to analyze the functional groups of coal samples;

Zeta potential analysis with electrophoresis instrument;

Conclusion: The fine-grained clean coal product of electrolytic flotation is black and granular powder with a yield of 95% and an ash content of 7.98%. The tailing coal is black powder with a yield of 5% and an ash content of 70.52%;

(8) storage

Store the clean coal and tailing coal after electrolytic flotation in a dry and clean environment, waterproof, sunscreen, moisture-proof, fireproof, acid-base and salt-proof, storage temperature 20°C ± 2°C, relative humidity ≤ 10%.

Beneficial effect

Compared with the background technology, the present invention has obvious advancement. The electrolytic flotation of fine-grained coal is carried out in electrolytic cells, flotation cells, foam tanks, and sedimentation tanks. Aluminum sulfate is used as the electrolyte, and 2-octanol is used as a foaming agent. , kerosene is used as collector, graphite tube is used as anode, stainless steel electrolytic cell is used as electrolysis cathode, electrolysis is carried out under the action of DC electric field, and then flotation, precipitation and drying are carried out. It can be used as a raw material in pharmaceutical, fine chemical and high value-added industries. It is an ideal method for electrolytic flotation of fine coal.

Description of drawings

Figure 1 is the state diagram of electrolytic flotation fine coal

As shown in the figure, the list of reference signs is as follows:

1. Electrolyzer, 2. Stainless steel cathode tank, 3. Graphite anode tube, 4. First coal slurry pump, 5. Outlet pipe, 6. Flotation tank, 7. Foam tank, 8. Sedimentation tank, 9. Electric Control box, 10, display screen, 11, indicator light, 12, anode regulator, 13, cathode regulator, 14, first coal slurry pump switch, 15, second coal slurry pump switch, 16, electrolytic stirrer switch, 17, flotation agitator switch, 18, electrolytic agitator, 19, flotation agitator, 20, anode cable, 21, cathode cable, 22, electrolyte solution, 23, flotation solution, 24, bubble, 25, wire.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, it is a state diagram of electrolytic flotation fine-grained coal. The position and connection relationship of each part must be correct, and the operation should be carried out in sequence.

Quantities of the chemicals used in electrolytic flotation are determined within pre-selected settings and are measured in kilograms, liters, millimeters.

The electrolytic flotation of fine-grained coal is carried out in electrolytic cells, flotation cells, foam tanks, and sedimentation tanks, and is completed under the action of DC electric field, electrolyte, foaming agent, and collector;

The electrolytic cell is rectangular, the periphery of the electrolytic cell 1 is a stainless steel cathode cell 2, and the middle position of the stainless steel cathode cell 2 is vertically placed with a graphite anode tube 3, an electrolytic stirrer 18 and an electrolyte 22, and the right part of the electrolytic cell 1 is a flotation cell 6, and connected by the liquid outlet pipe 5 and the first coal slurry pump 4, the flotation tank 6 is provided with a flotation agitator 19 and a flotation liquid 23; the right part of the flotation tank 6 is provided with a foam tank 7 and a sedimentation tank 8 , and connected by the liquid outlet pipe 5 and the second coal slurry pump 17, the air bubbles 24 in the flotation tank 6 enter the foam tank 7 for precipitation and clarification to obtain clean coal, and the coal slurry in the flotation tank 6 enters the sedimentation tank 8 for precipitation to obtain Coal tailings; an electric control box 9 is provided on the left of the electrolytic cell 1, and a display screen 10, an indicator light 11, an anode regulator 12, a cathode regulator 13, and a first coal slurry pump switch 14 are arranged on the electric control box 9 , the second coal slurry pump switch 15, the electrolytic stirring switch 16, the flotation stirring switch 17, the electric control box 9 is connected with the graphite anode tube 3 through the anode cable 20, connected with the stainless steel cathode tank 2 through the cathode cable 21, and connected with the stainless steel cathode tank 2 through the lead wire 25. The electrolytic agitator 18, the flotation agitator 19, the first coal slurry pump 4, and the second coal slurry pump 17 are connected.

Claims (2)

1. the electrolytic floatage method of a Bed for Fine Coal, it is characterized in that: the chemical substance material of use is: Bed for Fine Coal, aluminum sulfate, secondary octanol, kerosene, water, graphite-pipe, it is following that it prepares consumption: with kilogram, liter, millimeter is measurement unit

Bed for Fine Coal: C ₆₅₉H ₅₅₇O ₇₂N ₁₀S ₅P ₃100kg ± 0.1kg

Secondary octanol: C ₈H ₁₈O 0.049L ± 0.0001L

Kerosene: C ₂₂₅H ₄₅₂0.1L ± 0.01L

Aluminum sulfate: Al ₂(SO ₄) ₃18H ₂O 1kg ± 0.01kg

Water: H ₂O 2000L ± 1L

Graphite-pipe: C φ 300mm * 50mm * 500mm

Electrolytic floatage Bed for Fine Coal method is following:

(1) selected chemical substance material

The chemical substance material that coal separation is used will carry out selected, and carries out quality purity control:

Bed for Fine Coal: solid-state solid carbon amount>95%

Secondary octanol: liquid liquid 96%

Kerosene: liquid liquid 96%

Aluminum sulfate: solid-state solid 99.5%

Graphite-pipe: solid-state solid carbon amount>99.9%

Water: liquid liquid 95%

(2) preparing electrolyte

1kg ± 0.01kg places rustless steel container with aluminum sulfate, adds entry 10L, stirs 30min with agitator, and it is dissolved into: the aluminum sulfate aqueous solution of 0.15mol/L;

(3) electrolysis Bed for Fine Coal

The electrolysis Bed for Fine Coal is carried out in electrolytic cell, is under the effect of DC electric field and electrolyte, to accomplish;

1. electrolytic cell is made with stainless steel material, is the DC electric field negative electrode, and the electrolytic cell intermediate vertical is put graphite-pipe, and graphite-pipe is the DC electric field anode;

2. Bed for Fine Coal 100kg is added in the electrolytic cell;

Water 1000L is added in the electrolytic cell;

The aluminum sulfate aqueous solution 1L of 0.15mol/L is added in the electrolytic cell;

3. connect electrolytic cell stainless steel cathode power supply;

Connect the graphite-pipe anode supply;

DC electric field operating voltage 36V, electric current 0.5A;

4. under DC electric field, under the electrolyte effect, Bed for Fine Coal is carried out electrolysis, electrolysis time 15min becomes coal slurry after the electrolysis;

(4) flotation Bed for Fine Coal

1. with in the coal slurry suction flotation cell after the electrolysis, add collecting agent kerosene 0.1L, add the secondary octanol 0.049L of foaming agent, carry out flotation, will produce froth bed in the flotation cell;

2. close negative electrode, anode dc source;

3. scrape froth bed with scraper plate, then with in the bubble suction foam tank, the deposition clarification, sediment is a cleaned coal;

(5) concentration basin concentrates

Remaining coal slurry after the flotation is evacuated to concentration basin, concentrates, emit primary water after concentrating, the Bed for Fine Coal after the retention flotation is a tail coal;

(6) dried cleaned coal, tail coal

Cleaned coal after the flotation, tail coal are collected in respectively in the ceramic vessel, place drying box dry then, 75 ℃ of baking temperatures, drying time, 120min became cleaned coal and tail coal after the drying;

(7) detect, analyze, characterize

Pattern, color and luster, chemical composition, Chemical Physics performance to cleaned coal and tail coal detect, analyze, characterize;

Carry out the coal sample functional group analysis with FTIR8400S type infrared spectrometer;

Carry out the Zeta potential analysis with electrophoresis apparatus;

Conclusion: the Bed for Fine Coal cleaned coal product of electrolytic floatage is black, graininess powder, productive rate 95%, and ash content 7.98%, tail coal are the black powder, productive rate is 5%, ash content 70.52%;

(8) store

Cleaned coal behind the electrolytic floatage and tail coal are stored in the dried and clean environment respectively, waterproof, sun-proof, moistureproof, fire prevention, acid-proof alkali salt to corrode 20 ℃ ± 2 ℃ of storage temperatures, relative humidity≤10%.

2. the electrolytic floatage method of a kind of Bed for Fine Coal according to claim 1, it is characterized in that: the electrolytic floatage of Bed for Fine Coal carries out in electrolytic cell, flotation cell, under DC electric field, electrolyte, foaming agent, collecting agent effect, accomplishes;

Electrolytic cell is a rectangle; The periphery of electrolytic cell (1) is stainless steel cathode groove (2); Graphite anode pipe (3), electrolysis agitator (18) and electrolyte (22) are vertically put in the interior centre position of stainless steel cathode groove (2); The right part of electrolytic cell (1) is flotation cell (6), and is connected by drain pipe (5), first coal slurry pump (4), is provided with flotation agitator (19) and flotation fluid (23) in the flotation cell (6); Flotation cell (6) right part is provided with foam tank (7), sedimentation basin (8); And by drain pipe (5), second coal slurry pump (17) connection; Bubble (24) in the flotation cell (6) gets into to precipitate in the foam tank (7) to clarify and obtains cleaned coal, and the coal slurry in the flotation cell (6) gets into sedimentation basin (8) post precipitation and obtains tail coal; Left part at electrolytic cell (1) is provided with electric cabinet (9), on electric cabinet (9), is provided with display screen (10), indicator lamp (11), anode modulator (12), negative electrode modulator (13), the first coal slurry pump switch (14), the second coal slurry pump switch (15), electrolysis stir switch (16), switch (17) is stirred in flotation; Electric cabinet (9) connects with graphite anode pipe (3) through anode cable (20), connects with stainless steel cathode groove (2), connects with electrolysis agitator (18), flotation agitator (19), first coal slurry pump (4), second coal slurry pump (17) through lead (25) through cathode cable (21).

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