CN112067852A - Method for evaluating dust suppression effect of surfactant - Google Patents
Method for evaluating dust suppression effect of surfactant Download PDFInfo
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- CN112067852A CN112067852A CN202011014686.1A CN202011014686A CN112067852A CN 112067852 A CN112067852 A CN 112067852A CN 202011014686 A CN202011014686 A CN 202011014686A CN 112067852 A CN112067852 A CN 112067852A
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- 239000004094 surface-active agent Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000000428 dust Substances 0.000 title claims abstract description 33
- 230000001629 suppression Effects 0.000 title claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 112
- 238000009826 distribution Methods 0.000 claims abstract description 65
- 238000002474 experimental method Methods 0.000 claims abstract description 27
- 238000010586 diagram Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 4
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 3
- 239000012153 distilled water Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000004630 atomic force microscopy Methods 0.000 claims 2
- 230000003746 surface roughness Effects 0.000 claims 1
- 239000002817 coal dust Substances 0.000 abstract description 9
- 238000004880 explosion Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 25
- 238000002360 preparation method Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- HFQQZARZPUDIFP-UHFFFAOYSA-M sodium;2-dodecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O HFQQZARZPUDIFP-UHFFFAOYSA-M 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000012417 linear regression Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005464 sample preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/24—AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q30/00—Auxiliary means serving to assist or improve the scanning probe techniques or apparatus, e.g. display or data processing devices
- G01Q30/20—Sample handling devices or methods
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
- G06F9/30003—Arrangements for executing specific machine instructions
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Software Systems (AREA)
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Abstract
The invention provides a method for evaluating the dust suppression effect of a surfactant, which obtains the influence of surfactant solutions with different concentrations on the distribution rule of the surface potential of coal through an atomic force microscope experiment, and comprises the following steps: step 1, preparing a coal sample and preparing a surfactant solution, taking raw coal, and grinding the raw coal on a grinding and polishing machine to the size and the smoothness required by an atomic force microscope experiment, wherein the surface undulation is not more than 1 mu m. Selecting a sodium dodecyl benzene sulfonate surfactant; step 2, selecting a Kelvin atomic force microscope mode to obtain distribution information of surface potentials of coal soaked in surfactant solutions with different concentrations; step 3, obtaining a coal surface potential distribution diagram under different treatment conditions through NanoScope Analysis software; step 4, carrying out data processing on the coal surface potential distribution map, and extracting distribution information on the surface potential distribution map through different programs by using MATLAB software to obtain a coal surface potential area ratio distribution map; and 5, obtaining a method for evaluating the dust suppression effect of the surfactant according to the influence rule of the surfactant solution on the surface potential distribution of the coal. The invention provides a feasible method for evaluating the dust suppression effect of the surfactant solution, and has great application prospect in preventing coal dust explosion and other underground disasters.
Description
Technical Field
The invention belongs to the technical field of evaluation of dust suppression effect of a surfactant, relates to a method for measuring change rule of coal microcosmic surface potential distribution under the condition of treating with surfactant solutions with different concentrations, and particularly relates to a method for measuring the coal microcosmic surface potential distribution under the nanoscale through an atomic force microscope.
Technical Field
Coal dust is an inevitable product in the coal mine production process, has the hazards of explosion and pneumoconiosis, and is one of five disasters of the coal mine. Therefore, coal dust prevention and control are always the research hotspots in the coal mine industry. In recent years, the surfactant is widely applied in the coal dust treatment process, researches show that the surfactant can effectively improve the coal dust treatment efficiency, and domestic and foreign scholars evaluate the dust suppression effect of the surfactant by measuring parameters such as contact angle, surface tension and the like of the surfactant in the use process. However, researches show that the surfactant can simultaneously affect the surface potential of coal, so that the change rule of the surface potential distribution of the coal can effectively evaluate the dust suppression effect of the surfactant. The invention provides a method for evaluating the dust suppression effect of a surfactant by measuring the change rule of the surface potential distribution of coal under different treatment conditions, and enriches the existing methods for evaluating the dust suppression effect of the surfactant.
Disclosure of Invention
In order to enrich the method for evaluating the dust suppression effect of the surfactant, the invention provides a method for evaluating the dust suppression effect of the surfactant by measuring the change rule of the microscopic surface potential distribution of coal under different treatment conditions.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method of evaluating the dust suppression effect of a surfactant, characterized by: the method is based on a Kelvin atomic force microscope module of an atomic force microscope technology to obtain the distribution rule of the coal surface potential under different treatment conditions, and comprises the following steps:
step 1, preparing coal samples conforming to an atomic force microscope experiment, preparing surfactant solutions with different concentrations, dividing the coal samples into five groups, drying the coal samples, soaking the coal samples in distilled water and soaking the coal samples in the surfactant solutions with three different concentrations;
step 2, selecting a Kelvin atomic force microscope mode of an atomic force microscope, and measuring the information of the coal surface potential distribution under different treatment conditions;
step 3, performing second-order treatment on the coal surface potential distribution diagram through a Flatten command by using NanoScope Analysis software to obtain the coal surface potential distribution diagram under different treatment conditions;
step 4, based on the surface potential distribution diagram obtained in the step 3, obtaining the proportion of the surface potentials of different intervals of the surface potentials to the total surface potential by using different programs through MATLAB software, and drawing a coal surface potential area ratio distribution diagram;
and 5, obtaining the distribution rule of the coal surface potential under different treatment conditions, and obtaining the method for evaluating the dust suppression effect of the surfactant according to the distribution rule of the coal surface potential.
Compared with the traditional characterization method, the method for evaluating the dust suppression effect of the surfactant determines the influence of the surfactant on the distribution rule of the coal surface potential on the nanoscale, and the method for evaluating the dust suppression effect of the surfactant by utilizing the coal surface potential distribution under different treatment conditions has practical significance for enriching the method for evaluating the dust suppression effect of the surfactant.
As a technical solution of the present invention, the coal sample preparation and surfactant solution preparation in step 1 includes: cutting a coal sample, grinding the coal sample and preparing a surfactant solution to obtain the coal sample under different treatment conditions required by an atomic force microscope experiment.
As a technical solution of the present invention, the atomic force microscope experimental method in step 2 includes:
selecting a Kelvin atomic force microscope mode of an atomic force microscope, wherein the experiment adopts a Silicon Tip on Silicon Nitride Cantileverer probe, the Cantilever elastic coefficient k of the probe is 0.8N/m, and the resonance frequency f is0＝300kHz。
During the experiment of the atomic force microscope, the scanning range is set to be 5 x 5 μm, the frequency is 256Hz, the image resolution is set to be 256 x 256, the lifting height is 93.95nm (default height), the tapping mode is selected for the experiment, and 2000mV voltage is applied to the sample during the test.
As an embodiment of the present invention, the method for obtaining a distribution map of the surface potential of coal in step 3 includes:
selecting a Potential command of NanoScope Analysis software, displaying a coal surface Potential distribution map, continuously selecting a Flatten command, carrying out flattening processing, flattening to 2nd, correcting a large-range scanning curved surface caused by a scanning tube, selecting a Journal Quality Export command, and deriving the coal surface Potential distribution map under different processing conditions.
As a technical solution of the present invention, in the step 4, by using MATLAB software, different programs are used to obtain the ratio of the surface potential in different intervals of the surface potential to the total surface potential, and the method for drawing the coal surface potential area ratio distribution diagram includes:
starting MATLAB software, executing a new folder command, establishing a folder, storing coal surface potential distribution diagrams and execution tasks under different processing conditions in the same path, importing a program for calculating the proportion of the surface potentials of different intervals of the surface potentials to the total surface potential, executing an operation command to obtain a calculation result, importing the calculation result into origin software, and obtaining a coal surface potential area ratio distribution histogram.
In order to more intuitively observe the relationship between the coal surface potential distribution and the dust suppression effect of the surfactant, multivariate linear regression fitting is carried out on the coal surface potential area ratio distribution histogram.
As a technical solution of the present invention, the method for obtaining the distribution law of the coal surface potential under different treatment conditions in step 5 includes:
in order to observe the change rule of the coal surface potential distribution under different treatment conditions more intuitively, coal surface potential area ratio distribution histograms under different treatment conditions are drawn into the same graph to obtain new coal surface potential area ratio distribution histograms under different treatment conditions.
Drawings
FIG. 1 is a flow chart of the method of evaluating the dust suppressing effect of a surfactant of the present invention
FIG. 2 is a coal sample required for atomic force microscope experiment of the present invention
FIG. 3 is an atomic force microscope experiment working principle diagram of the present invention
FIG. 4 is a diagram showing the distribution of the surface potential of coal according to the present invention
FIG. 5 is a graph showing the surface potential distribution of coal under various treatment conditions according to the present invention
FIG. 6 is a distribution histogram of the area ratio of the surface potential of coal according to the present invention
Detailed Description
In order to make the above and other objects, features and advantages of the present invention more comprehensible, a method for evaluating the dust suppressing effect of a surfactant based on zhuang zhao coal is specifically described below, and the following description is given in detail with reference to the drawings.
As shown in fig. 1, fig. 1 is a flow chart of the method of evaluating the dust suppressing effect of a surfactant according to the present invention.
In step 1, the sample preparation method and experiment required by the atomic force microscope experiment are as follows:
sampling is carried out according to a coal bed coal sample collection method (GB/T482-. Then, the raw coal is cut to a size close to that required by an atomic force microscope experiment through a cutting machine, then the raw coal is ground on a grinding and polishing machine, sand paper is used for 200 meshes, 400 meshes, 800 meshes and 2000 meshes in sequence, the rotating speed is 150, a 2cm multiplied by 1cm cube is ground, and a coal sample is subjected to plastic package based on the fragile property of the coal, as shown in fig. 2.
The coal sample can produce the coal dust at the grinding and throwing in-process, consequently can constantly wet abrasive paper in sample preparation process, consequently utilizes muffle furnace vacuum drying cabinet to carry out the drying to the coal sample after sample preparation accomplishes, goes out the moisture in the coal sample, and drying time is 8 hours.
The preparation of the surfactant solution follows the principle of equal difference, the sodium dodecyl benzene sulfonate surfactant is selected to be powder, an electronic balance is used in the weighing process, the precision is three positions behind a decimal point, and distilled water is used in the solution preparation process. The surfactant was finally formulated in three concentration gradients of 0.1%, 0.2%, 0.3%.
The experiment was divided into five groups, namely dry coal samples, distilled water soaked coal samples and surfactant solution soaked coal samples of different concentrations. And (3) respectively soaking the dried coal sample in distilled water and surfactant solutions with different concentrations, taking out the coal sample after complete absorption, and carrying out atomic force microscope experiments after absorbing the moisture on the surface of the coal sample by using absorbent paper.
In step 2, an atomic force microscope experiment was performed based on the coal sample in step 1.
The experiment adopts a DimensionIcon type atomic force microscope manufactured by Bruker company in Germany, which mainly comprises a probe, a control system, a display system, a photoelectric detector, a feedback control system and the like, and the working schematic diagram of the atomic force microscope is shown in figure 3.
The atomic force microscope experiment adopts a Silicon Tip on Silicon Nitride Cantilever probe, the Cantilever elastic coefficient k is 0.8N/m, and the resonance frequency f0300 kHz. The experiment set the sweep range at 5 x 5 μm, the frequency at 256Hz, the image resolution dotting at 256 x 256, the lift height at 93.95nm (default height), the experiment selected the tapping mode, and a voltage of 2000mV was applied to the sample during the test.
The experiment is carried out in a stable atmospheric environment in a laboratory, each group of coal samples is subjected to atomic force microscope experiment at three different points, and the average value is obtained.
In step 3, the coal surface potential profile without passing the treatment condition was obtained by the NanoScope Analysis software.
Selecting a Potential command of NanoScope Analysis software, displaying a coal surface Potential distribution map, continuously selecting a Flatten command, carrying out flattening processing, flattening to 2nd, correcting a large-range scanning curved surface caused by a scanning tube, selecting a Journal Quality Export command, and deriving the coal surface Potential distribution map under different processing conditions, as shown in figure 4.
In step 4, the proportion of the surface potential of different intervals of the surface potential to the total surface potential is obtained by MATLAB software by using different programs, and a coal surface potential area ratio distribution diagram is drawn.
Starting MATLAB software, executing a new folder command, establishing a folder, storing coal surface potential distribution diagrams and execution tasks under different processing conditions in the same path, importing a program for calculating the proportion of the surface potentials of different intervals of the surface potentials to the total surface potential, executing an operation command to obtain a calculation result, importing the calculation result into origin software, and obtaining a coal surface potential area ratio distribution histogram.
The surface potential distribution diagrams of the coal samples under different treatment conditions correspond to different treatment procedures.
And changing programs according to the surface potential interval by other programs, obtaining five groups of data in a command line window, converting the data into percentages, introducing the percentages into origin software, drawing a coal surface potential area ratio distribution histogram, and performing multiple linear regression fitting on the coal surface potential area ratio distribution histogram in order to more visually observe the relationship between the coal surface potential distribution and the dust suppression effect of the surfactant, as shown in fig. 5.
In step 5, the distribution rules of the coal surface potential under different treatment conditions are obtained.
In order to observe the change rule of the coal surface potential distribution under different processing conditions more intuitively, coal surface potential area ratio distribution histograms under different processing conditions are drawn into the same graph to obtain a new coal surface potential area ratio distribution histogram under different processing conditions, as shown in fig. 6.
The surface potential distribution of the coal sample is mainly concentrated in a region with the surface potential absolute value less than 10mv, and accounts for about 85% of the surface area of the coal selected in the experiment. As the concentration of the SDBS solution increases, the area ratio of the surface potential of the coal sample in the area with the absolute value of less than 10mv is reduced, but the area ratio is still the main area of the surface potential distribution. And in the area of the surface potential absolute value more than 10mv, the area ratio of the surface potential of the coal sample is increased along with the increase of the concentration of the SDBS solution.
The coal dust particles rub with each other in the crushing process, electrons are obtained or lost on the surface, and the surface of the coal dust is positively charged or negatively charged. The charged coal dust moves and gathers towards the area with high potential, and along with the increase of the concentration of the SDBS solution, the area of the area with large absolute value of the surface potential is increased, the number of the extreme points of the surface potential of the coal is increased, and the dust emission can be reduced.
The dust suppression effect of the surface activity can be evaluated by measuring the surface potential value of the coal treated by the surfactant solution through an atomic force microscope experiment.
Claims (6)
1. A method for evaluating the dust suppression effect of a surfactant is characterized in that the method for evaluating the dust suppression effect of the surfactant comprises the following steps:
step 1, preparing a coal sample and preparing a surfactant solution, taking raw coal, and grinding the raw coal on a grinding and polishing machine to the size and the smoothness required by an atomic force microscope experiment, wherein the surface undulation is not more than 1 mu m. Sodium dodecyl benzene sulfonate surfactant solution with concentration of 0.1%, 0.2% and 0.3% separately is selected.
And 2, selecting a Kelvin atomic force microscope mode of an atomic force microscope to obtain the distribution information of the surface potential of the coal soaked in the surfactant solution with different concentrations, and setting a group of dry coal samples and a group of coal samples soaked in distilled water as a reference.
And 3, obtaining the coal surface potential distribution diagram under different treatment conditions through NanoScope Analysis software.
And 4, performing data processing on the coal surface potential distribution diagram, and extracting distribution information on the surface potential distribution diagram by using MATLAB software through different programs to obtain the coal surface potential area ratio distribution diagram.
And 5, obtaining the dust suppression effect of the surfactant solution according to the influence rule of the surfactant solution on the surface potential distribution of the coal.
2. The method for characterizing the dust suppression effect of the surfactant according to claim 1, wherein the freshly extracted raw coal is ground in step 1 by a grinding and polishing machine to the size and surface roughness required by atomic force microscopy experiments. Preparing a surfactant solution, and dividing the concentration gradient of the solution into three concentration gradients of 0.1%, 0.2% and 0.3% according to an equal ratio principle.
3. The method for characterizing the dust suppression effect of the surfactant according to claim 1, wherein in the step 2, based on the coal sample obtained in the step 1, the coal sample is divided into five groups, which are respectively different processing conditions, the coal sample is dried, the coal sample is soaked in distilled water, the coal sample is soaked in surfactant solutions with three different concentrations, and a Kelvin atomic force microscope mode of an atomic force microscope is selected to obtain the distribution information of the surface potential of the coal under different processing conditions.
4. The method for characterizing the dust suppressing effect of a surfactant according to claim 1, wherein the surface potential profile of coal under different treatment conditions is obtained in step 3 by means of NanoScope Analysis software according to the atomic force microscopy experiment performed in step 2.
5. The method for characterizing the dust suppression effect of the surfactant according to claim 1, wherein in step 4, based on the coal surface potential distribution map obtained in step 3, the coal surface potential area ratio distribution map is drawn by extracting the proportion of the potentials in different intervals of the surface potential to the total surface potential through MATLAB software by using different programs.
6. The method for characterizing the dust suppression effect of the surfactant according to claim 1, wherein in step 5, according to the coal surface potential area ratio distribution diagram under different treatment conditions obtained in step 4, the influence of surfactant solutions with different concentrations on the coal surface potential distribution rule is obtained, so as to obtain the dust suppression effect of the surfactant solutions.
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