CN111948101A - Qualitative detection method for surface wettability of pulverized coal sample - Google Patents
Qualitative detection method for surface wettability of pulverized coal sample Download PDFInfo
- Publication number
- CN111948101A CN111948101A CN202010805043.2A CN202010805043A CN111948101A CN 111948101 A CN111948101 A CN 111948101A CN 202010805043 A CN202010805043 A CN 202010805043A CN 111948101 A CN111948101 A CN 111948101A
- Authority
- CN
- China
- Prior art keywords
- floating
- methanol
- coal dust
- volume fractions
- different volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 62
- 238000001514 detection method Methods 0.000 title abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 73
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002817 coal dust Substances 0.000 claims abstract description 53
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 22
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 37
- 239000007864 aqueous solution Substances 0.000 description 9
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a qualitative detection method for the surface wettability of a pulverized coal sample. The detection method comprises the following steps: preparing methanol-water solutions with different volume fractions; calculating the surface tension of the methanol-water solution; uniformly scattering coal dust samples with the same mass on the surface of the methanol-water solution, standing for a period of time until the coal dust samples do not sink into the methanol-water solution any more, and obtaining floating coal dust particles floating on the surface of the methanol-water solution and sinking coal dust particles sinking into the methanol-water solution; calculating the floating mass fraction of floating coal dust particles in methanol-water solutions with different volume fractions; determining a floating sample mass fraction graph according to different floating mass fractions and surface tensions corresponding to the floating mass fractions; acquiring a first surface tension corresponding to the floating sample when the mass fraction of the floating sample is 50% based on the floating sample mass fraction graph; and detecting the surface wettability of the coal powder sample according to the first surface tension. The invention does not need to destroy the original granularity of the pulverized coal particles, thereby improving the detection precision.
Description
Technical Field
The invention relates to the field of qualitative detection of surface wettability of a coal powder sample, in particular to a qualitative detection method of surface wettability of a coal powder sample.
Background
At present, the quantitative test method for the surface wettability of the pulverized coal particles is mainly a contact angle method. The contact angle method measures the wettability of only one particular surface. The measurement results of the same sample have a certain difference due to the influence of surface roughness and surface heterogeneity and tabletting molding. In the beneficiation process, the modification effect of the medicament on the surface wettability of the coal dust is often researched, and when the change range of the wettability before and after the modification effect is smaller than the measurement error of a contact angle, the change of the wettability of the coal dust before and after the modification effect cannot be accurately reflected by a contact angle method. Therefore, the wettability difference of the same coal powder sample before and after modification cannot be accurately detected. In addition, before the contact angle method is used for testing, the coal powder is required to be pressed into sheets for forming, the sample preparation requirement is high, and special instruments and equipment are required to be used for measurement. In addition, the pulverized coal must be ground to a certain particle size during tabletting molding, which destroys the original particle size of pulverized coal particles, exposes the fresh surface inside the pulverized coal particles, and interferes the measurement of the wettability of the fresh surface inside the particles on the surface of the original particles, thus causing the distortion of the detection result.
Disclosure of Invention
The invention aims to provide a qualitative detection method for the surface wettability of a coal powder sample, which aims to solve the problems that the existing quantitative detection method for the surface wettability of coal powder particles cannot accurately detect the wettability difference of the same coal powder sample before and after modification, the original particle size of the coal powder particles is damaged, and the detection result is distorted.
In order to achieve the purpose, the invention provides the following scheme:
a qualitative detection method for surface wettability of a pulverized coal sample comprises the following steps:
preparing methanol-water solutions with different volume fractions;
calculating the surface tension of the different volume fractions of methanol-water solution;
uniformly scattering coal dust samples with the same mass on the surfaces of the methanol-water solutions with different volume fractions, standing for a period of time until the coal dust samples do not sink into the methanol-water solutions, and obtaining floating coal dust particles floating on the surfaces of the methanol-water solutions with different volume fractions and sinking coal dust particles sinking into the methanol-water solutions with different volume fractions;
calculating the floating mass fraction of the floating coal dust particles in the methanol-water solutions with different volume fractions according to the floating coal dust particles and the sinking coal dust particles;
determining a floating sample mass fraction map according to the different floating mass fractions and the surface tensions corresponding to the floating mass fractions;
obtaining a first surface tension corresponding to the floating sample mass fraction of 50% based on the floating sample mass fraction map;
and detecting the surface wettability of the coal powder sample according to the first surface tension.
Optionally, the preparing methanol-water solutions with different volume fractions specifically includes:
and respectively measuring deionized water and methanol with different volumes into a beaker by using a pipette, sealing the beaker, and storing the beaker in a water bath constant temperature oscillator at 25 ℃ to obtain methanol-water solutions with different volume fractions.
Optionally, the calculating the surface tension of the methanol-water solutions with different volume fractions specifically includes:
calculating the surface tension of the methanol-water solution with different volume fractions by using a proportional method;
alternatively, the first and second electrodes may be,
the surface tension of the methanol-water solutions of different volume fractions was measured using a surface tensiometer.
Optionally, the obtaining floating coal dust particles floating on the surface of the methanol-water solution with different volume fractions and sinking coal dust particles sinking in the methanol-water solution with different volume fractions further includes:
and respectively drying the floating pulverized coal particles and the sinking pulverized coal particles, and determining the mass of the dried floating pulverized coal particles and the mass of the dried sinking pulverized coal particles.
Optionally, the calculating the floating mass fraction of the floating pulverized coal particles in the methanol-water solutions with different volume fractions according to the floating pulverized coal particles and the sinking pulverized coal particles specifically includes:
according to the formula
Calculating the floating mass fraction of the floating coal dust particles in the methanol-water solution with different volume fractions; wherein α is the floating mass fraction; m isFloatThe mass of the dried floating pulverized coal particles; m isSink downThe mass of the dried sinking coal dust particles is shown.
Optionally, the detecting the surface wettability of the pulverized coal sample according to the first surface tension specifically includes:
the greater the first surface tension, the less surface wetting the coal fines sample.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a qualitative detection method for the surface wettability of a coal powder sample, which utilizes the difference of methanol-water solutions with different surface tensions to the wettability of coal powder to represent the wettability change of the same coal powder sample. The invention does not need tabletting and forming before testing, does not destroy the original granularity of the particles, does not need special instruments and equipment during measurement, can be completed by manual operation, and has simple and easy operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments 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 those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a qualitative detection method for surface wettability of a pulverized coal sample according to the present invention;
FIG. 2 is a schematic diagram of the determination of the surface wettability of the pulverized coal particles in practical application provided by the present invention.
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.
The invention aims to provide a qualitative detection method for the surface wettability of a coal powder sample, which can detect the wettability difference of the same coal powder sample before and after modification without destroying the original granularity of coal powder particles, thereby improving the detection precision.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flow chart of a qualitative detection method for surface wettability of a pulverized coal sample provided by the present invention, and as shown in fig. 1, the qualitative detection method for surface wettability of a pulverized coal sample comprises:
step 101: preparing methanol-water solutions with different volume fractions.
The step 101 specifically includes: and respectively measuring deionized water and methanol with different volumes into a beaker by using a pipette, sealing the beaker, and storing the beaker in a water bath constant temperature oscillator at 25 ℃ to obtain methanol-water solutions with different volume fractions.
Step 102: the surface tension of the different volume fractions of methanol-water solution was calculated.
The step 102 specifically includes: calculating the surface tension of the methanol-water solution with different volume fractions by using a proportional method; alternatively, the surface tension of the methanol-water solution of different volume fractions is measured using a surface tensiometer.
Step 103: uniformly scattering coal dust samples with the same mass on the surfaces of the methanol-water solutions with different volume fractions, standing for a period of time until the coal dust samples do not sink into the methanol-water solutions, and obtaining floating coal dust particles floating on the surfaces of the methanol-water solutions with different volume fractions and sinking coal dust particles sinking into the methanol-water solutions with different volume fractions.
The step 103 further comprises: and respectively drying the floating pulverized coal particles and the sinking pulverized coal particles, and determining the mass of the dried floating pulverized coal particles and the mass of the dried sinking pulverized coal particles.
Step 104: and calculating the floating mass fraction of the floating coal dust particles in the methanol-water solutions with different volume fractions according to the floating coal dust particles and the sinking coal dust particles.
The step 104 specifically includes: according to the formula
Calculating the floating mass fraction of the floating coal dust particles in the methanol-water solution with different volume fractions; wherein α is the floating mass fraction; m isFloatThe mass of the dried floating pulverized coal particles; m isSink downThe mass of the dried sinking coal dust particles is shown.
Step 105: determining a floating sample mass fraction map according to the different floating mass fractions and the surface tensions corresponding to the floating mass fractions.
Step 106: and acquiring a first surface tension corresponding to the floating sample mass fraction of 50% based on the floating sample mass fraction map.
Step 107: and detecting the surface wettability of the coal powder sample according to the first surface tension.
The step 107 specifically includes: the greater the first surface tension, the less surface wetting the coal fines sample.
In practical application, the specific detection method is as follows:
first, methanol-water solutions of different volume fractions (methanol content 0-100%, at intervals of 10%, if necessary at intervals of 5%) were prepared. Taking an aqueous solution with 50% of methanol volume fraction as an example, accurately measuring 100mL of deionized water and methanol (analytically pure) into a 250mL beaker by using a pipette, sealing the beaker, placing the beaker in a water bath constant temperature oscillator at 25 ℃ for storage, wherein the methanol-aqueous solutions with different volume fractions have different surface tensions, and calculating the surface tension of the methanol-aqueous solution (the surface tension can be calculated by a proportional method or actually measured by a surface tension meter).
Respectively taking 50mL of methanol-water solution with different volume fractions, transferring the methanol-water solution into a 50mL beaker, weighing about 0.2g of coal powder sample each time, uniformly scattering the coal powder sample on the surface of the methanol-water solution with different volume fractions, and standing for five minutes. After no more coal dust particles sink into the solution, a small spoon is used for carefully scooping up the coal dust particles floating on the liquid surface and transferring the coal dust particles to filter paper with known mass, and all the particles on the small spoon are flushed onto the filter paper for filtering. Meanwhile, the coal dust sample sinking to the liquid surface is carefully transferred into filter paper with known quality by a washing bottle and filtered. The collected samples (the maximum allowable particle size of the sample is 0.5mm) are dried and weighed, and then the mass fraction of the floating sample is calculated.
In the formula, alpha is the mass fraction of the floating sample, and the unit is%; m isFloat: mass of floating sample, singlyThe bit is g; m isSink down: the mass of the sample is settled in g.
Each test was repeated three times, and the test results were averaged, as shown in FIG. 2.
And (4) plotting the mass fraction of the floating sample with the corresponding surface tension of the solution to obtain a graph of the mass fraction of the floating sample corresponding to the aqueous solutions with different surface tensions.
The surface wettability of the pulverized coal particles was evaluated by the surface tension of the aqueous solution corresponding to a 50% mass fraction of the floating sample. When the mass fraction of the floating sample is 50%, the larger the surface tension of the corresponding aqueous solution is, the smaller the surface wettability of the surface pulverized coal particles is, and conversely, the larger the surface wettability of the pulverized coal particles is. When the surface wettability of the same sample is changed, the surface tension of the corresponding aqueous solution is changed when the mass fraction of the floating sample is 50%. The method can sensitively measure the wettability change of the coal powder sample.
The method evaluates the surface wettability of the coal powder particles by measuring the surface tension of the corresponding aqueous solution when the mass fraction of the coal powder floating on the surface of the solution in the aqueous solutions with different surface tensions is 50%. The method avoids the influence of the surface roughness and the surface heterogeneity of the coal dust particles and the wettability of the tabletting molding surface to a great extent, can sensitively determine the wettability of the coal dust sample, and is particularly suitable for comparing the wettability change of the same sample caused by the change of test conditions.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A method for qualitatively detecting the surface wettability of a coal powder sample is characterized by comprising the following steps:
preparing methanol-water solutions with different volume fractions;
calculating the surface tension of the different volume fractions of methanol-water solution;
uniformly scattering coal dust samples with the same mass on the surfaces of the methanol-water solutions with different volume fractions, standing for a period of time until the coal dust samples do not sink into the methanol-water solutions, and obtaining floating coal dust particles floating on the surfaces of the methanol-water solutions with different volume fractions and sinking coal dust particles sinking into the methanol-water solutions with different volume fractions;
calculating the floating mass fraction of the floating coal dust particles in the methanol-water solutions with different volume fractions according to the floating coal dust particles and the sinking coal dust particles;
determining a floating sample mass fraction map according to the different floating mass fractions and the surface tensions corresponding to the floating mass fractions;
obtaining a first surface tension corresponding to the floating sample mass fraction of 50% based on the floating sample mass fraction map;
and detecting the surface wettability of the coal powder sample according to the first surface tension.
2. The method for qualitatively detecting the surface wettability of the coal dust sample according to claim 1, wherein the preparation of methanol-water solutions with different volume fractions specifically comprises:
and respectively measuring deionized water and methanol with different volumes into a beaker by using a pipette, sealing the beaker, and storing the beaker in a water bath constant temperature oscillator at 25 ℃ to obtain methanol-water solutions with different volume fractions.
3. The method for qualitatively detecting the surface wettability of the coal dust sample according to claim 1, wherein the step of calculating the surface tension of the methanol-water solutions with different volume fractions specifically comprises the steps of:
calculating the surface tension of the methanol-water solution with different volume fractions by using a proportional method;
alternatively, the first and second electrodes may be,
the surface tension of the methanol-water solutions of different volume fractions was measured using a surface tensiometer.
4. The method for qualitatively detecting the surface wettability of the coal dust sample according to claim 1, wherein the steps of obtaining floating coal dust particles floating on the surface of the methanol-water solution with different volume fractions and sinking coal dust particles sinking in the methanol-water solution with different volume fractions further comprise:
and respectively drying the floating pulverized coal particles and the sinking pulverized coal particles, and determining the mass of the dried floating pulverized coal particles and the mass of the dried sinking pulverized coal particles.
5. The method for qualitatively detecting the surface wettability of the coal dust sample according to claim 4, wherein the step of calculating the floating mass fraction of the floating coal dust particles in the methanol-water solution with different volume fractions according to the floating coal dust particles and the sinking coal dust particles specifically comprises the following steps:
according to the formula
Calculating the floating mass fraction of the floating coal dust particles in the methanol-water solution with different volume fractions; wherein α is the floating mass fraction; m isFloatThe mass of the dried floating pulverized coal particles; m isSink downThe mass of the dried sinking coal dust particles is shown.
6. The method for qualitatively detecting the surface wettability of the coal dust sample according to the claim 1, wherein the method for detecting the surface wettability of the coal dust sample according to the first surface tension specifically comprises the following steps:
the greater the first surface tension, the less surface wetting the coal fines sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010805043.2A CN111948101A (en) | 2020-08-12 | 2020-08-12 | Qualitative detection method for surface wettability of pulverized coal sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010805043.2A CN111948101A (en) | 2020-08-12 | 2020-08-12 | Qualitative detection method for surface wettability of pulverized coal sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111948101A true CN111948101A (en) | 2020-11-17 |
Family
ID=73332329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010805043.2A Pending CN111948101A (en) | 2020-08-12 | 2020-08-12 | Qualitative detection method for surface wettability of pulverized coal sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111948101A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063702A (en) * | 2021-03-29 | 2021-07-02 | 中国石油大学(华东) | Novel evaluation method suitable for formation silt solid particle surface wettability |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104220557A (en) * | 2012-03-27 | 2014-12-17 | 杰富意钢铁株式会社 | Method for blending coal, blended coal, and method for producing coke |
| US20150033833A1 (en) * | 2013-08-01 | 2015-02-05 | Prem Kumar Bikkina | Method and Device for Determining Solid Particle Surface Energy |
-
2020
- 2020-08-12 CN CN202010805043.2A patent/CN111948101A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104220557A (en) * | 2012-03-27 | 2014-12-17 | 杰富意钢铁株式会社 | Method for blending coal, blended coal, and method for producing coke |
| US20150033833A1 (en) * | 2013-08-01 | 2015-02-05 | Prem Kumar Bikkina | Method and Device for Determining Solid Particle Surface Energy |
Non-Patent Citations (4)
| Title |
|---|
| JIANLIDIAO，D.W.FUERSTENAU: "Characterization of the wettability of solid particles by film flotation 2. Theoretical analysis", 《COLLOIDS AND SURFACES》, no. 60 * |
| M.C. WILLIAMS , D.W. FUERSTENAU: "A simple flotation method for rapidly assessing the hydrophobicity of coal particles", 《INTERNATIONAL JOURNAL OF MINERAL PROCESSING》, vol. 1, no. 20, pages 2 - 4 * |
| 张燕红: "中学生学习辞典 化学卷", vol. 1, 上海世界图书出版公司, pages: 421 - 424 * |
| 解兴智等: "煤润湿性测量方法的探讨", 《煤炭科学技术》, no. 02 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063702A (en) * | 2021-03-29 | 2021-07-02 | 中国石油大学(华东) | Novel evaluation method suitable for formation silt solid particle surface wettability |
| CN113063702B (en) * | 2021-03-29 | 2022-11-01 | 中国石油大学(华东) | Novel evaluation method suitable for formation silt solid particle surface wettability |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103512829A (en) | Method for measuring sediment concentration through density of muddy water | |
| CN103512821A (en) | Method for testing liquid absorption rate of battery diaphragm | |
| CN106770886A (en) | Insulator contamination water-soluble cationic composition detection analyzes the chromatography of ions | |
| CN104569121B (en) | Method for detecting lead ion concentration in solution | |
| CN111948101A (en) | Qualitative detection method for surface wettability of pulverized coal sample | |
| CN103293175B (en) | Measure the method for liquid soluble glass chemical composition | |
| CN101551319B (en) | Method for measuring concentration of suspended particles in the drainage of sewage treatment industry | |
| CN210775151U (en) | Spontaneous imbibition experimental device for compact sensitive reservoir | |
| CN102520134B (en) | Environmental probe capable of in-situ testing pH value of soil body | |
| CN105572259A (en) | Method for determining critical micelle concentration of surfactant | |
| CN116223768A (en) | Method for rapidly determining rock type rubidium ore grade in field | |
| CN105021499A (en) | Visualization method for evaluating fluid diffusion in porous media by using MRI | |
| CN105527353A (en) | Method for determining solvent solubility by tracer agent headspace gas chromatography | |
| Laitinen et al. | Amperometric Titration Cell for Use with Dropping Mercury Electrode | |
| CN105628119B (en) | For the micro-flow measurement device in bundle of capillary tubes | |
| CN108507923A (en) | Rock core magnetic nuclear resonance analyzer porosity measurement precision is examined and bearing calibration | |
| CN114152640A (en) | Method for determining content of adsorbed water in soil based on nuclear magnetic resonance | |
| CN202330224U (en) | On-line floater soil granularity analyzer | |
| CN109506735B (en) | Method for detecting multiple immiscible liquids | |
| CN204758404U (en) | Portable rock normal position erosion rate measuring apparatu | |
| CN111220507A (en) | Method for rapidly measuring wettability of protein powder | |
| CN104568644A (en) | Method for measuring content of sand in water sample by use of 1000ml volumetric flask | |
| CN103575621A (en) | Method for measuring apparent contact angle of liquid on surfaces of particles | |
| CN211955098U (en) | Water sample sand content measuring device based on pressure difference | |
| CN109085095B (en) | Soil contact angle testing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201117 |