CN114054217A - Method for treating high-sodium high-inertness coal - Google Patents
Method for treating high-sodium high-inertness coal Download PDFInfo
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- CN114054217A CN114054217A CN202111374663.6A CN202111374663A CN114054217A CN 114054217 A CN114054217 A CN 114054217A CN 202111374663 A CN202111374663 A CN 202111374663A CN 114054217 A CN114054217 A CN 114054217A
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- 239000003245 coal Substances 0.000 title claims abstract description 93
- 239000011734 sodium Substances 0.000 title claims abstract description 44
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005188 flotation Methods 0.000 claims abstract description 44
- 239000003250 coal slurry Substances 0.000 claims abstract description 42
- 238000003756 stirring Methods 0.000 claims abstract description 31
- 239000004088 foaming agent Substances 0.000 claims abstract description 17
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000007790 scraping Methods 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000001760 fusel oil Substances 0.000 claims description 4
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 2
- 239000004079 vitrinite Substances 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 abstract 1
- 238000005303 weighing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000000967 suction filtration Methods 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229920002101 Chitin Polymers 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a method for processing high-sodium high-inertness coal, which comprises the steps of crushing and grinding coal into fine-particle raw coal with the particle size of 5-500 mu m; mixing fine raw coal with water to prepare coal slurry with the concentration of 80-100g/L, and stirring the coal slurry for 30 s; charging CO into coal slurry2Gas, with CO filling2Stirring, stopping introducing CO after 3-10min2A gas; adding a collecting agent into the coal slurry, and stirring the coal slurry for 2 min; adding a foaming agent into the coal slurry, and stirring the coal slurry for 20-60 s; charging CO into coal slurry2And (4) carrying out froth-scraping flotation on the gas, wherein the froth-scraping flotation time is 5-10 min. The method for treating the high-sodium high-inertness coal comprises the step of using CO2The pretreatment is carried out on the coal slurry, so that the sodium removal rate of the coal sample is obviously improved while the vitrinite recovery rate and the enrichment ratio are improved, and the pretreatment has important significance for the comprehensive utilization of high-sodium high-inertness group coal and the environmental protection.
Description
Technical Field
The invention relates to the technical field of coal micro-component enrichment, in particular to a method for treating high-sodium high-inertness coal.
Background
The predicted resource reserve of the Xinjiang east China coal field reaches 3900 million tons, and the accumulated coal resource reserve is currently found to be 2136 million tons, so that the Xinjiang east China coal field is the largest whole coal field in China. The east Junggar coal is mainly non-caking coal and has the characteristics of low ash, high heat, high inert component, high alkali and alkaline earth metal content and the like. After alkali metals such as Na and the like in the east Junggar coal are combusted, part of the alkali metals exist in smoke in the form of steam, so that the problems of slag bonding, contamination and the like of a boiler are easily caused; the high content of the inert component can not only reduce the liquefaction capacity of the coal, but also increase the difficulty of preparing high-concentration water-coal-slurry, but the coal rich in the inert component can be used as a raw material for preparing carbon materials or fuels.
At present, the high-sodium coal is mainly utilized by blending low-alkali metal coal for combustion, but the method cannot fundamentally solve the problems of equipment slagging, contamination and the like, and an effective method needs to be found for carrying out sodium removal pretreatment on the high-sodium coal. The method for separating and enriching the microscopic components mainly adopts a specific gravity method, but the specific gravity method has little treatment capacity, is only limited to laboratory application and is difficult to realize industrialization. Therefore, researchers are gradually focusing on a flotation separation method which is easy to industrialize and is used for separation and enrichment based on the surface property difference of coal rocks. Because the efficient medicament system and the flotation process parameters which are adaptive to the surface property difference between the coal and rock components are not completely clarified, the enrichment rate of the micro-components obtained by the current flotation separation method is lower.
Therefore, according to the structural property difference of different micro-components and the occurrence state of sodium element, an effective flotation separation method is searched to reduce the sodium content and improve the enrichment rate of the micro-components, and the method has important values on the treatment of environmental pollution and the high-efficiency utilization of coal energy.
Disclosure of Invention
In order to overcome the defects of the prior art scheme, the invention provides a method for treating high-sodium high-inertness coal, which applies CO2Pretreating the coal sample with CO2The flotation is carried out in a flotation machine instead of air, so that the enrichment rate of vitrinite in clean coal and the enrichment rate of inertinite in tail coal are improved while the sodium content of the coal sample product is reduced.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for treating high-sodium high-inertness coal comprises the following steps:
s1: crushing and grinding coal into fine raw coal with the particle size of 5-500 mu m;
s2: mixing the fine-grained raw coal obtained in the step S1 with water to prepare coal slurry with the concentration of 80-100g/L, and stirring the coal slurry for 30S;
s3: charging CO into the coal slurry in step S22Gas, with CO filling2Stirring, stopping introducing CO after 3-10min2A gas;
s4: adding a collecting agent into the coal slurry in the step S3, and stirring the coal slurry for 2-3 min;
s5: adding a foaming agent into the coal slurry in the step S4, and stirring the coal slurry for 20-60S;
s6: charging CO into the coal slurry in step S52And (4) carrying out froth-scraping flotation on the gas, wherein the froth-scraping flotation time is 5-10 min.
Preferably, the fine-grained raw coal in step S1 is a high-sodium high-inertness group coal.
Preferably, the temperature of the coal slurry in the steps S2, S3, S4, S5 and S6 is 10-40 ℃, and the stirring speed is 1800 and 2500 r/min.
Preferably, CO is selected from the group consisting of step S3 and step S62The flow rate of the gas is 0.125-0.4m3/h。
Preferably, the collector in step S4 is a cationic collector or a compounded collector.
Preferably, the collector in step S4 is a MB recompounded collector.
Preferably, the frother in step S5 is an alcohol collector.
Preferably, the foaming agent in step S5 is sec-octanol or fusel oil.
Preferably, the amount of the collector used in the step S4 is 2000-3000 g/t.
Preferably, the amount of the foaming agent used in step S5 is 500-1000 g/t.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes CO2Providing H to coal slurry by dissolving in water to form carbonic acid+And CO is generated due to the barrier of the aqueous solution and the coal particles2The sodium-containing coal slurry is adsorbed on the surfaces of coal particles and dissociated in the coal slurry, so that the inter-particle effect of coal is reduced, the coal particles are distributed more uniformly, the contact area of the coal particles and the solution is increased, and the removal of sodium components in the coal is effectively promoted.
2. CO in the invention2H produced by dissolving in water+With Na liberated from the coal+Adsorption can be generated on the surface of the coal particles, and the surface potential of the coal particles is changed, so that the wettability difference between the vitrinite and the inertinite is increased, and the flotation separation effect is enhanced.
3. The invention utilizes CO2The water can be dissolved into water and form micro-nano and nano-sized bubbles in the water, and the bubbles can be adsorbed on the surfaces of coal particles so as to enhance the hydrophobicity of the coal; and due to CO2The collector and the foaming agent molecule are adsorbed with the nonpolar end of the collector molecule and the alcohol foaming agent molecule, so that the hydrophobic capacity of the nonpolar end of the collector and the foaming agent molecule is enhanced, the collector and the foaming agent molecule are more easily attached to a gas-liquid interface, and the stability of bubbles is improved. Compared with the flotation effect of the common flotation method, CO is used2The pretreated coal slurry is subjected to flotation, and the vitrinite recovery rate and enrichment ratio of clean coal are greatly improved.
Drawings
For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a flotation device according to an embodiment of the invention.
In the figure: 1-CO2A gas cylinder; 2-a pressure reducing valve; 3-a rotameter; 4-a flotation machine; 5-a flotation tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the flotation plant used in the present invention comprises a flotation machine 4 and a flotation tank 5, CO, arranged below the flotation machine 42The gas cylinder 1 is connected with a flotation tank 5, CO through a pipeline2A pressure reducing valve 2 is arranged on a pipeline at the outlet of the gas cylinder 1, and a rotor flow meter 3 is also arranged on the pipeline.
The high-sodium high-inertness group coal adopted in the following examples is high-sodium high-inertness group coal mined from the east of Xinjiang, the sodium content in the coal is 4677 mu g/g, the proportion of vitrinite is 47.15% (mineral base removal), the proportion of inertinite is 52.45% (mineral base removal), and the proportion of chitin is 0.4% (mineral base removal).
Example 1
Crushing high-sodium high-inertness group coal by a crusher to an average particle size of below 500 mu m, weighing 80g of crushed fine-grain raw coal, pouring the crushed fine-grain raw coal into a flotation tank 5, mixing the fine-grain raw coal with water to prepare coal slurry with the concentration of 80g/L, stirring the coal slurry for 30s by a flotation machine 4 at the rotating speed of 2000r/min, and then stirring the coal slurry for 0.125m3Volume flow rate/h from CO2The gas cylinder 1 feeds CO with the purity of 99.999 percent into the flotation tank 52Gas, with CO filling2Stirring, stopping aeration after 3min, adding MB compound collector with the use amount of 2000g/t, stirring for 2min, adding fusel oil foaming agent with the use amount of 500g/t, stirring for 20s, and adding 0.125m3Volume flow rate/h from CO2The gas cylinder 1 feeds CO with the purity of 99.999 percent into the flotation tank 52Air and start to scrape bubbles for 5 min. Respectively filtering the flotation clean coal and the tailing coal by suctionDrying, weighing and detecting the sodium content and the vitrinite content.
Comparative example 1
Crushing high-sodium high-inertness group coal by a crusher to an average particle size of below 500 mu m, weighing 80g of crushed fine-grain raw coal, pouring the crushed fine-grain raw coal into a flotation tank 5, mixing the crushed fine-grain raw coal with water to prepare coal slurry with the concentration of 80g/L, stirring the coal slurry by a flotation machine 4 at the rotating speed of 2000r/min for 3min, adding an MB compound collecting agent with the dosage of 2000g/t, stirring for 2min, adding a fusel oil foaming agent with the dosage of 500g/t, stirring for 20s, and then stirring for 0.125m3The volume flow of/h charges the flotation cell 5 with air and starts the froth scraping for 5 min. And respectively carrying out suction filtration, drying and weighing on the flotation clean coal and the tail coal, and detecting the sodium content and the vitrinite content.
The specific experimental results of comparative example 1 and example 1 are shown in table 1:
table 1 comparison of experimental results of example 1 with comparative example 1
Example 2
Crushing high-sodium high-inertness group coal by a crusher to an average particle size of below 500 mu m, weighing 80g of crushed fine-grain raw coal, pouring the crushed fine-grain raw coal into a flotation tank 5, mixing the fine-grain raw coal with water to prepare coal slurry with the concentration of 80g/L, stirring the coal slurry for 30s by a flotation machine 4 at the rotating speed of 2000r/min, and then stirring the coal slurry for 0.125m3Volume flow rate/h from CO2The gas cylinder 1 feeds CO with the purity of 99.999 percent into the flotation tank 52Gas, with CO filling2Stirring, stopping aeration after 3min, adding MB compound collector with the use amount of 3000g/t, stirring for 2min, adding secondary-octanol foaming agent with the use amount of 1000g/t, stirring for 20s, and adding 0.125m3Volume flow rate/h from CO2The gas cylinder 1 feeds CO with the purity of 99.999 percent into the flotation tank 52Gas and startScraping the bubbles for 5 min. And respectively carrying out suction filtration, drying and weighing on the flotation clean coal and the tail coal, and detecting the sodium content and the vitrinite content.
Comparative example 2
Crushing high-sodium high-inertness coal by a crusher to an average particle size of below 500 mu m, weighing 80g of crushed fine-grain raw coal, pouring the crushed fine-grain raw coal into a flotation tank 5, mixing the crushed fine-grain raw coal with water to prepare coal slurry with the concentration of 80g/L, stirring the coal slurry by a flotation machine 4 at the rotating speed of 2000r/min for 3min, adding an MB compound collecting agent, wherein the using amount of the MB compound collecting agent is 3000g/t, adding a sec-octanol foaming agent after stirring for 2min, wherein the using amount of the sec-octanol foaming agent is 1000g/t, stirring for 20s, and then adding 0.125m3The volume flow of/h charges the flotation cell 5 with air and starts the froth scraping for 5 min. And respectively carrying out suction filtration, drying and weighing on the flotation clean coal and the tail coal, and detecting the sodium content and the vitrinite content.
The specific experimental results of comparative example 2 and example 2 are shown in table 2:
table 2 comparison of experimental results of example 2 and comparative example 2
As can be seen from tables 1 and 2, the method for treating the high-sodium high-inertness group coal has the advantages that the sodium removal rate of the clean coal, the vitrinite recovery rate and the enrichment ratio are greatly improved compared with the flotation effect of the common flotation method.
Claims (10)
1. A method for treating high-sodium high-inertness coal is characterized by comprising the following steps:
s1: crushing and grinding a coal sample into fine raw coal particles of 5-500 mu m;
s2: mixing the fine-grained raw coal obtained in the step S1 with water to prepare coal slurry with the concentration of 80-100g/L, and stirring the coal slurry for 30S;
s3: charging CO into the coal slurry in step S22Gas, with CO filling2Stirring, stopping introducing CO after 3-10min2A gas;
s4: adding a collecting agent into the coal slurry in the step S3, and stirring the coal slurry for 2-3 min;
s5: adding a foaming agent into the coal slurry in the step S4, and stirring the coal slurry for 20-60S;
s6: charging CO into the coal slurry in step S52And (4) carrying out froth-scraping flotation on the gas, wherein the froth-scraping flotation time is 5-10 min.
2. The method for processing the high-sodium high-inertness coal according to claim 1, wherein the coal sample in the step S1 is the high-sodium high-inertness coal.
3. The method for processing high-sodium high-inertness coal according to claim 1, wherein the temperature of the coal slurry in the steps S2, S3, S4, S5 and S6 is 10-40 ℃, and the stirring speed is 1800-2500 r/min.
4. The method for processing high-sodium high-inertness coal according to claim 1, wherein CO is used in step S3 and step S62The flow rate of the gas is 0.125-0.4m3/h。
5. The method for treating the high-sodium high-inertness coal according to claim 1, wherein the collector in the step S4 is a cationic collector or a compounded collector.
6. The method for treating the high-sodium high-inertness coal according to claim 5, wherein the collector in the step S4 is an MB compound collector.
7. The method for processing the high-sodium high-inertness coal according to claim 1, wherein the foaming agent in the step S5 is an alcohol collector.
8. The method for processing the coal with high sodium and high inertness component of claim 7, wherein the foaming agent in the step S5 is sec-octanol or fusel oil.
9. The method for treating the coal with high sodium content and high inertness component as claimed in claim 1, wherein the amount of the collector used in the step S4 is 2000-3000 g/t.
10. The method for processing high-sodium high-inertness coal as claimed in claim 1, wherein the amount of the foaming agent used in step S5 is 500-1000 g/t.
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