CN114054217B - Method for treating high-sodium high-inertness coal - Google Patents
Method for treating high-sodium high-inertness coal Download PDFInfo
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- CN114054217B CN114054217B CN202111374663.6A CN202111374663A CN114054217B CN 114054217 B CN114054217 B CN 114054217B CN 202111374663 A CN202111374663 A CN 202111374663A CN 114054217 B CN114054217 B CN 114054217B
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- 239000003245 coal Substances 0.000 title claims abstract description 81
- 239000011734 sodium Substances 0.000 title claims abstract description 41
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005188 flotation Methods 0.000 claims abstract description 42
- 239000003250 coal slurry Substances 0.000 claims abstract description 39
- 238000003756 stirring Methods 0.000 claims abstract description 33
- 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 22
- 239000002245 particle Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004088 foaming agent Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000001760 fusel oil Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 2
- 239000002002 slurry Substances 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
- 238000005303 weighing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000967 suction filtration Methods 0.000 description 3
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical group CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 229920002101 Chitin Polymers 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000015572 biosynthetic process 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
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 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
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a method for treating high-sodium high-inertness coal, which comprises the steps of crushing coal into fine raw coal with the particle size of 5-500 mu m; mixing the fine raw coal with water to prepare coal slurry with the concentration of 80-100g/L, and stirring the coal slurry for 30s; CO filling in coal slurry 2 Gas is filled with CO at the same time 2 Stirring for 3-10min, and stopping CO charging 2 A gas; adding a collector into the coal slurry, and stirring the coal slurry for 2min; adding a foaming agent into the coal slurry, and stirring the coal slurry for 20-60s; CO filling in coal slurry 2 The gas is scraped for flotation, and the time of the scraped flotation is 5-10min. The method for treating high-sodium high-inertness coal is characterized by using CO 2 The coal slurry is pretreated, so that the sodium removal rate of the coal sample is obviously improved while the recovery rate and the enrichment ratio of the vitrinite are improved, and the method has important significance for comprehensive utilization of high-sodium high-inertness coal and 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 estimated reserve of the resources of the eastern coal fields in Xinjiang of China reaches 3900 hundred million tons, and the accumulated reserve of the coal resources is 2136 hundred million tons at present, so that the method is the largest whole coal field in China. The eastern coal is mainly non-caking coal and has the characteristics of low ash, high heat, high inertness, high alkali and alkaline earth metals and the like. The part of the alkali metal such as Na in the eastern coal exists in the smoke in the form of vapor after combustion, which is easy to cause various problems such as slag bonding and contamination of the boiler; the high content of inert components not only reduces the liquefying capability of coal, but also increases the difficulty of preparing high-concentration coal water slurry, but the rich inert component coal can be used as a raw material for preparing carbon materials or fuels.
At present, the utilization of high-sodium coal is mainly to mix low-alkali metal coal for combustion, but the method can not fundamentally solve the problems of slag formation, pollution and the like of equipment, and an effective method for sodium removal pretreatment of the high-sodium coal is needed to be found. The separation and enrichment method of the microscopic components is mainly a specific gravity method, but the treatment capacity of the specific gravity method is small and is limited to laboratory application, so that industrialization is difficult to realize. Researchers are gradually directing their eyes towards easily industrialized flotation separation methods that separate and enrich based on differences in the surface properties of coal and rock. Because the high-efficiency reagent system and flotation process parameters which are out of phase and adapt to the surface property difference between coal and rock components are not completely known, the enrichment rate of the microcomponents obtained by the current flotation separation method is low.
Therefore, according to the structural property difference of different micro-components and the occurrence state of sodium elements, an effective flotation separation method is searched for so as to reduce the sodium content and improve the enrichment rate of the micro-components at the same time, and the method has important values for the treatment of environmental pollution and the efficient utilization of coal energy.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for treating high-sodium high-inertness coal, which uses CO 2 Pretreating coal sample with CO 2 In flotation machines instead of airFlotation, namely reducing the sodium content of the coal sample product and improving the enrichment rate of vitrinite in clean coal and the enrichment rate of inertinite in tail coal.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for treating high sodium high inertness coal, comprising the steps of:
s1: crushing coal into fine raw coal with the particle size of 5-500 mu m;
s2: mixing the fine-grained raw coal 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 S2 2 Gas is filled with CO at the same time 2 Stirring for 3-10min, and stopping CO charging 2 A gas;
s4: adding a collector into the coal slurry in the step S3, and stirring the coal slurry for 2-3min;
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 S5 2 The gas is scraped for flotation, and the time of the scraped flotation is 5-10min.
Preferably, the fine 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 rotation speed is 1800-2500r/min.
Preferably, CO in step S3 and step S6 2 The flow rate of the gas is 0.125-0.4m 3 /h。
Preferably, the collector in step S4 is a cationic collector or a built collector.
Preferably, the collector in step S4 is an MB built collector.
Preferably, the frother in step S5 is an alcohol collector.
Preferably, the foaming agent in step S5 is a secondary octanol or a fusel oil.
Preferably, the collector is used in step S4 in an amount of 2000-3000g/t.
Preferably, the amount of blowing agent used in step S5 is 500-1000g/t.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes CO 2 Dissolving in water to form carbonic acid to provide H to coal slurry + And due to the obstruction of the water solution and the coal particles, the CO 2 The catalyst is adsorbed on the surfaces of coal particles and is free in coal slurry, so that the 'inter-particle effect' of coal is reduced, and the coal particles are distributed more uniformly, so that the contact area of the coal particles and a solution is increased, and the removal of sodium components in the coal is effectively promoted.
2. CO in the present invention 2 H produced by dissolution in water + And Na extracted from coal + Adsorption may occur on the surface of the coal particles, altering the surface potential of the coal particles such that the difference in wettability of the vitrinite and inertinite increases, thereby enhancing the flotation separation effect.
3. The invention utilizes CO 2 Is soluble in water and forms micro-nano and nano-sized bubbles in water that adsorb to the surface of coal particles to enhance the hydrophobicity of the coal; and due to CO 2 Belongs to nonpolar molecules, and is adsorbed with nonpolar ends of collector molecules and alcohol foamer molecules, thereby enhancing the hydrophobic capacity of the nonpolar ends of the collector and foamer molecules, enabling the collector and foamer molecules to be more easily attached to a gas-liquid interface, and being beneficial to improving the stability of bubbles. Compared with the flotation effect of the general flotation method, the method uses CO 2 The pretreated coal slurry is subjected to flotation, and the vitrinite recovery rate and the enrichment ratio of the clean coal are greatly improved.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a flotation device according to an embodiment of the present invention.
In the figure: 1-CO 2 A gas cylinder; 2-reduction ofA pressure valve; 3-rotameter; a 4-flotation machine; 5-a flotation cell.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the flotation apparatus used in the present invention comprises a flotation machine 4 and a flotation tank 5, co, disposed below the flotation machine 4 2 The gas cylinder 1 is connected with the flotation tank 5 and CO through a pipeline 2 The pipeline of the outlet of the gas cylinder 1 is provided with a pressure reducing valve 2, and the pipeline is also provided with a rotameter 3.
The high sodium and high inertness coal used in the examples below was high sodium and high inertness coal mined from the eastern of Xinjiang, the sodium content of the coal was 4677 μg/g, the vitrinite content was 47.15% (demineralised), the inertinite content was 52.45% (demineralised), and the chitin content was 0.4% (demineralised).
Example 1
Crushing high-sodium high-inertness coal into particles with an average particle diameter of less than 500 mu m by a crusher, weighing 80g of crushed fine raw coal, pouring into a flotation tank 5, mixing with water, preparing into coal slurry with a concentration of 80g/L, stirring the coal slurry for 30s by a flotation machine 4 at a rotating speed of 2000r/min, and then stirring the coal slurry for 0.125m 3 Volume flow of/h from CO 2 The gas cylinder 1 fills the flotation tank 5 with CO having a purity of 99.999% 2 Gas is filled with CO at the same time 2 Stirring for 2min, stopping aeration after 3min, adding MB compound collector with the dosage of 2000g/t, adding fusel oil foaming agent with the dosage of 500g/t, stirring for 20s, and adding 0.125m 3 Volume flow of/h from CO 2 The gas cylinder 1 fills the flotation tank 5 with CO having a purity of 99.999% 2 The gas and start to scrape the bubbles for 5min. 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 1
Crushing high-sodium high-inertness coal into particles with the average particle diameter of less than 500 mu m by a crusher, weighing 80g of crushed fine raw coal, pouring the particles into a flotation tank 5, mixing with water, preparing into coal slurry with the concentration of 80g/L, stirring the coal slurry by a flotation machine 4 at the rotating speed of 2000r/min, stirring for 3min, adding an MB compound collector 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 stirring for 0.125m 3 The volume flow per h fills the flotation tank 5 with air and begins to scrape the froth for 5min. 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 and comparative example 1
Example 2
Crushing high-sodium high-inertness coal into particles with an average particle diameter of less than 500 mu m by a crusher, weighing 80g of crushed fine raw coal, pouring into a flotation tank 5, mixing with water, preparing into coal slurry with a concentration of 80g/L, stirring the coal slurry for 30s by a flotation machine 4 at a rotating speed of 2000r/min, and then stirring the coal slurry for 0.125m 3 Volume flow of/h from CO 2 The gas cylinder 1 fills the flotation tank 5 with CO having a purity of 99.999% 2 Gas is filled with CO at the same time 2 Stirring for 3min, stopping aeration, adding MB compound collector with the dosage of 3000g/t, stirring for 2min, adding sec-octanol foaming agent with the dosage of 1000g/t, stirring for 20s, and adding 0.125m 3 Volume flow of/h from CO 2 The gas cylinder 1 fills the flotation tank 5 with CO having a purity of 99.999% 2 The gas and start to scrape the bubbles for 5min. Filtering, drying, weighing and sodium-collecting the refined coal and tail coalAnd detecting the content and the vitrinite content.
Comparative example 2
Crushing high-sodium high-inertness coal into particles with the average particle diameter of less than 500 mu m by a crusher, weighing 80g of crushed fine raw coal, pouring the particles into a flotation tank 5, mixing with water, preparing into coal slurry with the concentration of 80g/L, stirring the coal slurry by a flotation machine 4 at the rotating speed of 2000r/min, stirring for 3min, adding an MB compound collector with the dosage of 3000g/t, stirring for 2min, adding a sec-octanol foaming agent with the dosage of 1000g/t, stirring for 20s, and stirring for 0.125m 3 The volume flow per h fills the flotation tank 5 with air and begins to scrape the froth for 5min. 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 high-sodium high-inertness coal in the invention 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 general flotation method.
Claims (9)
1. A method for treating high sodium and high inertness coal, comprising the steps of:
s1: breaking the high-sodium high-inertness coal sample into fine raw coal with the particle size of 5-500 mu m;
s2: mixing the fine-grained raw coal 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 S2 2 Gas is filled with CO at the same time 2 Stirring for 3-10min, and stopping CO charging 2 A gas;
s4: adding a collector into the coal slurry in the step S3, and stirring the coal slurry for 2-3min;
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 S5 2 The gas is scraped for flotation, and the time of the scraped flotation is 5-10min.
2. The method for processing high-sodium high-inertness coal as claimed in claim 1, wherein the slurry temperature in the steps S2, S3, S4, S5 and S6 is 10-40 ℃ and the stirring rotation speed is 1800-2500r/min.
3. The method for processing high-sodium high-inertness coal as claimed in claim 1, wherein the CO in step S3 and step S6 is 2 The flow rate of the gas is 0.125-0.4m 3 /h。
4. The method for processing high sodium and high inertness coal as claimed in claim 1, wherein the collector in step S4 is a cationic collector or a compound collector.
5. The method for processing high sodium and high inertness coal as claimed in claim 4, wherein the collector in step S4 is an MB compound collector.
6. The method for treating high sodium and high inertness coal as claimed in claim 1, wherein the frother in step S5 is an alcohol collector.
7. The method for treating high sodium and high inertness coal group of claim 6, wherein the foaming agent in step S5 is sec-octanol or fusel oil.
8. The method for treating high sodium and high inertness coal as claimed in claim 1, wherein the collector is used in an amount of 2000 to 3000g/t in step S4.
9. The method for treating high sodium and high inertness coal as claimed in claim 1, wherein the amount of the foaming agent used in the step S5 is 500 to 1000g/t.
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| CN202111374663.6A CN114054217B (en) | 2021-11-19 | 2021-11-19 | Method for treating high-sodium high-inertness coal |
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| CN202111374663.6A CN114054217B (en) | 2021-11-19 | 2021-11-19 | Method for treating high-sodium high-inertness coal |
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