CN111366683A - Method for rapidly detecting stability of slurry of solid-liquid two-phase fluid - Google Patents
Method for rapidly detecting stability of slurry of solid-liquid two-phase fluid Download PDFInfo
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- CN111366683A CN111366683A CN202010192427.1A CN202010192427A CN111366683A CN 111366683 A CN111366683 A CN 111366683A CN 202010192427 A CN202010192427 A CN 202010192427A CN 111366683 A CN111366683 A CN 111366683A
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Abstract
The invention discloses a method for quickly testing the stability of slurry of solid-liquid two-phase fluid, which is characterized by comprising the following steps of: s1, taking the volume as V0The slurry is put into a high-precision container; s2Addition volume V1An indicator of (1); the indicator is incompatible with solutions and solids of two-phase fluids, the indicator having a density less than that of the solid phase and greater than that of the liquid phase; s3, performing solid-liquid separation on the slurry by using a high-speed centrifuge or a vibrator; s4, reading the partial volume V of the liquid above the indicator2(ii) a S5, calculating to obtain the solid volume V3＝V0‑V1‑V2(ii) a And S6, analyzing the stability of the slurry according to the volume ratio of the solid to the liquid. Therefore, the method ensures that the solid-liquid separation boundary line is clear and easy to read, ensures that the volume precision of the read liquid is higher, and improves the accuracy of the solid-liquid volume ratio.
Description
Technical Field
The invention relates to the field of slurry mixing, in particular to a method for detecting the stability of slurry consisting of solid-liquid two-phase fluid.
Background
Adding different solid particles into a solvent, adding a dispersing agent or other additives, and forming slurry of the solid-liquid two-phase flow two-phase fluid by various stirring modes. Wherein the stability and uniformity of the slurry become important influencing factors in the next processing step. How to quickly evaluate the stability of the slurry becomes a key point of the quality control of the slurry.
The uniformity of the slurry can be checked by detecting the quality control points of the slurry in different areas. At present, the quality control points of the slurry in the industry mainly comprise viscosity, solid content, density, fineness and pH value. The method adopts a high-speed centrifugation solid-liquid separation mode to carry out rapid detection.
And (3) viscosity detection: at present, the detection is mainly carried out by a viscosity detection instrument. Since slurry viscosity is dependent on temperature, agitation speed, settling time, etc., we classify slurries as non-newtonian fluids by the definition of newtonian fluids and non-newtonian fluids. After the slurry is stirred relatively uniformly, the viscosity of the slurry gradually decreases along with the increase of the stirring time, and finally, the viscosity of the slurry tends to a stable value. Therefore, after sampling, the detection at different times is different greatly, and only one sample can be detected at one time, and the detection time of one sample exceeds 5 minutes.
Solid content detection: the calculation of the ratio of the solids content to the total slurry is currently performed mainly by baking the slurry and weighing the weight of the remaining solids content. The method can be used for batch testing, generally the time is more than 24 hours in order to obtain better precision, and the time is long, so that the method is not suitable for production.
And (3) density detection: relatively speaking, the method is suitable for the slurry with larger difference and poorer stability, the accuracy is not too high, and the influence of human factors is larger.
And (3) fineness detection: the method is generally characterized in that a fineness detector is adopted for detection, and the method mainly detects whether partial particles exist in the slurry mixing process and have the phenomenon of no infiltration or agglomeration. The advantages are that: the detection is relatively quick, and the defects are as follows: the influence of human factors is large, and the repeatability is poor.
And (3) detection of the pH value: adopt the PH tester to detect, often be used for the detection between different batches of thick liquids, the pH value of the liquid environment inside the thick liquids is little different basically, so detect through the pH value and assess the homogeneity inside the thick liquids hardly.
And (3) detecting the centrifugal solid-liquid ratio: the rapid centrifugal function of the centrifugal machine is used for detection, the original mixed environment is broken, liquid is arranged on the upper portion, and solid is arranged on the lower portion. And carrying out rapid analysis through the solid-liquid ratio and the solid content. The method has the advantages that: can detect the sample simultaneously, the time is relatively fast, is fit for the quick production link of industrialization, but has following problem:
1. even after the slurry is subjected to solid-liquid separation, the liquid part does not contain any solid component, so that homochromatism exists between the solid phase and the liquid phase, and the boundary of the homochromatism is fuzzy and difficult to distinguish.
2. Compared with a method for promoting solid-liquid separation by adopting a vibrator, the method has the advantages that the centrifugal machine can be used more efficiently, but the solid surface is not a plane but a slope or an arc surface when solid-liquid separation is carried out due to the action of centrifugal force, so that a large error exists in reading of the solid-liquid volume, and the precision of a measuring result is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: method for rapidly testing stability of slurry of solid-liquid two-phase fluid
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for rapidly testing the stability of slurry of a solid-liquid two-phase fluid comprises the following steps:
s1, taking the volume as V0The slurry is put into a high-precision container;
s2, adding volume V1An indicator of (1); the indicator is incompatible with solutions and solids of two-phase fluids, andthe density of the indicator is less than the density of a solid phase and greater than the density of a liquid phase;
s3, performing solid-liquid separation on the slurry by using a high-speed centrifuge or a vibrator;
s4, reading the partial volume V of the liquid above the indicator2；
S5, calculating to obtain the solid volume V3＝V0-V2；
And S6, analyzing the stability of the slurry according to the volume ratio of the solid to the liquid.
Compared with the prior art, the invention has the following technical effects:
the indicator is located at the solid-liquid boundary, making the solid-liquid separation boundary clear and easy to read.
The volume of the indicator is fixed, the slope of the solid surface is filled, and the boundary line between the indicator and the liquid part can always keep a plane, so that the read volume precision of the liquid is higher, and the accuracy of the solid-liquid volume ratio is improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Preferably, the resolution of the high-precision container is less than or equal to 0.2 ml;
the beneficial effect of adopting above-mentioned further scheme is more accurate to the measurement of volume.
Preferably, the indicator is a color indicator or a transparent indicator.
The beneficial effect of adopting the further scheme is that the solid-liquid boundary line is convenient to present.
Preferably, the indicator is chloroform.
The beneficial effect of adopting the further scheme is that the materials are easy to obtain.
Preferably, multiple samples can be sampled simultaneously and tested simultaneously.
The beneficial effect of adopting above-mentioned further scheme is avoided the error nature of laboratory glassware in the process of many times detection, has improved detection speed and precision.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram illustrating the solid-liquid separation effect of the slurry in the embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in figure 1, the method for rapidly testing the slurry stability of the solid-liquid two-phase fluid comprises the following steps:
s1, taking the volume as V0The slurry of (a) was placed in a container with a resolution of 0.1 ml;
s2, adding volume V1Trichloromethane (III); the chloroform is incompatible with the solution and the solid of the two-phase fluid, and the density of the chloroform is smaller than that of the solid phase and larger than that of the liquid phase;
s3, performing solid-liquid separation on the slurry by using a high-speed centrifuge or a vibrator;
s4, reading the volume V of the liquid part above the trichloromethane2；
S5, calculating to obtain the solid volume V3＝V0-V2；
And S6, analyzing the stability of the slurry according to the volume ratio of the solid to the liquid.
As shown in fig. 2, slurry is sampled and placed into a customized high-precision container with the resolution of 0.1ml, trichloromethane 2 is added into the slurry sample, the high-precision container containing the slurry is placed in a high-speed centrifuge, parameters are set, solid-liquid layering of the slurry is carried out, a solid layer 1 and a liquid layer 3 are obtained after the solid-liquid layering of the slurry, and since trichloromethane 2 is incompatible with a solution and a solid of a two-phase fluid and the density of trichloromethane is lower than that of a solid phase and higher than that of a liquid phase, trichloromethane appears in the middle of layering to separate the solid layer 1 from the liquid layer 3.
Because solid-liquid separation is promoted by using a centrifugal machine, a slope-shaped interface L is formed on the upper surface of the solid layer1However, the indicator chloroform 2 remains liquid and can fill the ramp-like interface L1So that the interface L of the triple filtered methane 2 with the liquid layer 32Maintain a planar state, thereby ensuringAccuracy of reading the liquid volume.
The slurry stability was evaluated by analysis of the values on the vessel for the solid part and the liquid part vessel.
As shown, the index at the indicator is h2The liquid level of the liquid layer is indicated by h1Due to the fact that V is placed in the container0Slurry of (2) and (V)1So that h is1＝V0+V1The liquid fraction volume is h1-h2The volume of the solid portion is h2-V1Therefore, the solid-liquid ratio can be calculated,
liquid-solid (h)1-h2)/(h2-V1)
Liquid (h) total ═ total1-h2)/(h1-V1)
Fixed ratio of total (h)2-V1)/(h1-V1)
The method can be used for detecting a plurality of samples simultaneously, avoids the error of the experimental instrument in the process of multiple detections, and improves the detection speed and precision.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A method for rapidly testing the stability of slurry of a solid-liquid two-phase fluid is characterized by comprising the following steps:
s1, taking the volume as V0The slurry is put into a high-precision container;
S2addition volume V1An indicator of (1); the indicator is incompatible with solutions and solids of two-phase fluids, the indicator having a density less than that of the solid phase and greater than that of the liquid phase;
s3, performing solid-liquid separation on the slurry by using a high-speed centrifuge or a vibrator;
s4, reading the partial volume V of the liquid above the indicator2；
S5, calculating to obtain the solid volume V3＝V0-V1-V2；
And S6, analyzing the stability of the slurry according to the volume ratio of the solid to the liquid.
2. The method for rapidly verifying slurry stability of a solid-liquid two-phase fluid according to claim 1, wherein a resolution of said high-precision vessel is 0 or less.2ml。
3. The method for rapidly verifying slurry stability of a solid-liquid two-phase fluid according to claim 1, wherein the indicator is a color indicator or a transparent indicator.
4. The method for rapidly verifying slurry stability of a solid-liquid two-phase fluid according to claim 1, wherein said indicator is chloroform.
5. The method for rapidly verifying slurry stability of a solid-liquid two-phase fluid according to claim 1, wherein a plurality of samples are simultaneously sampled and simultaneously detected.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326942A (en) * | 2020-10-29 | 2021-02-05 | 中国核工业华兴建设有限公司 | Device and method for testing bleeding and volume stability of cement slurry |
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| GB591102A (en) * | 1944-05-06 | 1947-08-07 | Frederick Trostler | Improvements in and relating to the separation of solid materials of different specific gravities |
| CN105842108A (en) * | 2016-03-22 | 2016-08-10 | 中国石油大学(华东) | Method for determination of solid content of catalytic cracking oil slurry |
| CN206291934U (en) * | 2016-12-29 | 2017-06-30 | 青岛农业大学 | A kind of irregularly shaped object volume measurement device |
| CN108169059A (en) * | 2017-12-20 | 2018-06-15 | 山西长征动力科技有限公司 | A kind of evaluation method of lithium ion battery electrode sizing agent stability |
| CN109126206A (en) * | 2018-09-29 | 2019-01-04 | 任少虎 | A kind of mixing liquid separation method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326942A (en) * | 2020-10-29 | 2021-02-05 | 中国核工业华兴建设有限公司 | Device and method for testing bleeding and volume stability of cement slurry |
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Application publication date: 20200703 |