CN110595965A - Selection method for slurry particle grading for pipeline transportation - Google Patents
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- CN110595965A CN110595965A CN201910893269.XA CN201910893269A CN110595965A CN 110595965 A CN110595965 A CN 110595965A CN 201910893269 A CN201910893269 A CN 201910893269A CN 110595965 A CN110595965 A CN 110595965A
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- 239000002002 slurry Substances 0.000 title claims abstract description 117
- 239000002245 particle Substances 0.000 title claims abstract description 38
- 238000010187 selection method Methods 0.000 title claims description 9
- 239000000523 sample Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 238000004062 sedimentation Methods 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 239000011362 coarse particle Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004513 sizing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 239000003245 coal Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
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- 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
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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Abstract
A method of sizing a slurry particle for pipeline transport, comprising: (1) according to the initial grading table, slurry raw materials with different particle grading are obtained through grinding, screening and weighing preparation modes; (2) mixing the pulp raw materials with water to obtain a prepared pulp body with the same mass concentration of the pulp raw materials at all levels; (3) respectively putting different grades of slurry into different containers with the same specification, and performing settlement analysis; (4) inserting the pulp subjected to the settleability analysis in the step (3) into a probe with a weight tray for hard bottom analysis; (5) analyzing the viscosity of different grades of slurry by adopting a capillary viscosity testing principle; (6) selecting the slurry gradation most suitable for pipeline transportation according to the analysis results of the steps (3), (4) and (5) and the particle thickness; the slurry with the optimal gradation suitable for pipeline transportation can be screened out; the problems of fine grading average particle size, viscosity, friction loss and energy consumption increase caused by the existing method are solved; also has the characteristic of wide application range.
Description
Technical Field
The invention belongs to the field of slurry pipeline transportation, and particularly relates to a selection method for slurry particle gradation for pipeline transportation.
Background
The pipeline slurry transportation is a process of taking water as a carrier, crushing and grinding minerals to prepare qualified slurry with certain grain size distribution and concentration, and transporting the slurry through a pipeline. The pipeline conveying technology of the slurry is an energy-saving and environment-friendly technology, and has the advantages of small occupied area, strong adaptability, no pollution and the like compared with the traditional material conveying mode.
In order to ensure the safe and economical operation of the slurry pipeline, on one hand, the slurry to be conveyed is required to have good stability so as to prevent the pipeline from being blocked by the settlement of particles, and on the other hand, the viscosity coefficient of the slurry to be conveyed is required to be small so as to reduce the energy loss caused by the frictional resistance, thereby reducing the pressure grade of equipment and pipelines and reducing the system cost. The particle size distribution of the slurry is an important factor influencing the two properties, and the influence effect on the two properties is opposite. Under the condition of certain material types, when the average material diameter of the gradation is smaller, the stability of the material is better, and the viscosity is increased. It is a very realistic question for pipeline transportation of slurry how to select a proper slurry particle size distribution so as to enable the stability and viscosity of the slurry to reach an equilibrium point which is most suitable for pipeline transportation.
At present, the choice of slurry particle composition in engineering design is still determined by referring to empirical data of similar engineering. Because the flow characteristics of materials with different properties and different types are different even if the same grading is used, the materials are difficult to have uniform standard grading and can be suitable for various materials. When the properties and types of conveyed materials change, in order to ensure the conveying safety, a conservative design method is usually adopted on the basis of referring to similar projects, and a grading with a finer average particle size is selected, so that the slurry can be ensured to have enough stability, the viscosity of the slurry is increased, and the friction loss, the ore grinding energy consumption and the system cost are increased.
Therefore, the development of a method for selecting the particle composition of the slurry conveyed by a pipeline is urgently needed in the field. In engineering practice, the optimal slurry particle size grading is screened from a plurality of grading of materials with specific properties aiming at specific projects, the slurry viscosity is moderate while the slurry stability is ensured, so that the pipe conveying resistance is minimum, and the slurry is not easy to precipitate in stagnation.
Disclosure of Invention
The invention aims to solve the problems of fine particles, high viscosity, friction loss, ore grinding power consumption and increase and improvement of system cost caused by the fact that the existing slurry particle composition selection method is still determined by referring to similar engineering empirical data in the design of slurry pipeline transportation engineering.
The technical scheme adopted by the invention is as follows: a selection method for the classification of slurry particles for pipeline transportation is characterized by comprising the following steps:
(1) according to the initial grading table, slurry raw materials with different particle grading are obtained through grinding, screening and weighing preparation modes;
(2) mixing the pulp raw materials with water to obtain pulp with the same mass concentration of the pulp raw materials at all levels;
(3) respectively putting different grades of slurry into different containers with the same specification, and performing settlement analysis;
(4) inserting the pulp subjected to the settleability analysis in the step (3) into a probe with a weight tray for hard bottom analysis;
(5) analyzing the viscosity of different grades of slurry by adopting a capillary viscosity testing principle;
(6) according to the analysis results of the steps (3), (4) and (5) and the particle size, preferably selecting the grading with good stability, weak hard bottom degree, low viscosity and coarse particle size as the optimal slurry conveying grading according to the priority order of stability > hard bottom degree > viscosity > particle size, and comparing the particle size with the grading weighted average particle size; preferably selecting the slurry grading which is most suitable for pipeline transportation;
further, in the slurry prepared in each stage in the step (2), the mixing ratio of the slurry raw material and water is carried out according to the mass concentration, and the value range of the mass concentration is 30-50%.
Further, the container in the step (3) is a measuring cylinder with the specification of more than or equal to 1000 ml; carrying out sedimentation analysis by recording sedimentation time and sedimentation amount; the sedimentation amount is taken as a recording standard above the sedimentation amount of the interface of the clear liquid and the turbid liquid; the settling time is carried out by adopting different methods according to the settling speed of the slurry; when the slurry is settled quickly, recording the slurry of different levels in a mode of uninterrupted round value; when the slurry is slowly settled, recording in an equal time interval mode; the comparison of the sedimentation speed is measured by the time length of the accelerated sedimentation section, the time of the accelerated sedimentation section is more than or equal to 8 hours, and the slurry stability is good; the settling volume relationship curve tends to plateau.
Further, before the sedimentation in the step (4) is completed and the hard bottom analysis is carried out, obvious disturbance cannot be generated on the slurry; the analysis of the hard bottom is carried out by inserting a probe, the length of the probe is 15cm-30cm, the diameter of the probe is 4mm-7mm, a weight tray is arranged at the top end of the probe, the diameter of the probe is 5cm-6cm, the hard bottom degree is measured by adding the weight at the top end of the probe, the weight is less than 30g, and the degree of the hard bottom of the pulp is weak.
Further, in the step (5), the flow velocity of the slurry in the capillary is less than 1m/s, the sampling amount is less than or equal to 100ml, and the pressure change value in the slurry storage device before and after sampling is required to be kept less than or equal to 1%; and when the viscosity difference of other grades of slurry is less than 5mPa & s compared with the slurry with the minimum viscosity, the viscosity characteristics of the two slurries are considered to be the same.
The invention has the advantages and characteristics that:
(1) the slurry particle grading selection method provided by the invention can screen the slurry with the optimal grading suitable for pipeline transportation from a plurality of grades of materials with specific properties through the steps of raw material preparation, slurry preparation, sedimentation analysis, hard bottom analysis, viscosity analysis, relatively optimization and the like. Solves the problems of finer grading average particle size, increased viscosity, friction loss and energy consumption caused by the prior art method.
(2) The method provided by the invention has the characteristic of wide application range of solid materials, and when the types of the materials are changed, the slurry with good stability and moderate viscosity can be gradually optimized and adjusted by analyzing the initial gradation by the method.
Detailed Description
The invention relates to a selection method of coal gangue slurry gradation in pipeline transportation, which comprises the following steps:
(1) according to the initial grading table, slurry raw materials with different particle grading are obtained through grinding, screening and weighing preparation modes;
(2) the pulp raw materials are mixed with water to obtain pulp with the same mass concentration of the pulp raw materials at all levels, the mixing ratio of the pulp raw materials to the water is carried out according to the mass concentration, and the value range of the mass concentration is 30-50%.
(3) Respectively placing different-grade slurry into different containers (preferably, a measuring cylinder with the specification of more than or equal to 1000ml is adopted, when the size of less than 1000ml is adopted, the diameter of the measuring cylinder is too thin, the side wall effect is caused, the particle sedimentation is influenced, and the measured data has larger deviation) with the same specification, and carrying out sedimentation analysis; carrying out sedimentation analysis by recording sedimentation time and sedimentation amount; the sedimentation amount is taken as a recording standard above the sedimentation amount of the interface of the clear liquid and the turbid liquid; the settling time is carried out by adopting different methods according to the settling speed of the slurry; when the slurry is settled quickly, recording the slurry of different levels in a mode of uninterrupted round value; when the slurry is slowly settled, recording in an equal time interval mode; the comparison of the sedimentation speed is measured by the time length of the accelerated sedimentation section, the time of the accelerated sedimentation section is more than or equal to 8 hours, and the slurry stability is good; the settling volume relationship curve tends to plateau.
(4) Inserting the pulp subjected to the settleability analysis in the step (3) into a probe with a weight tray for hard bottom analysis; before the sedimentation is completed and the hard bottom analysis is carried out, obvious disturbance can not be generated in the slurry; the analysis of the hard bottom is carried out by inserting a probe, preferably the length of the probe is 15cm-30cm, the diameter of the probe is 4mm-7mm, a weight tray is arranged at the top end of the probe, the diameter is 5cm-6cm, the hard bottom degree is measured by adding the weight at the top end of the probe, the weight is less than 30g, and the degree of the hard bottom of the pulp is weak.
(5) Analyzing the viscosity of different grades of slurry by adopting a capillary viscosity testing principle; the flow velocity of the slurry in the capillary is less than 1m/s, the sampling amount is less than or equal to 100ml, and the pressure change value in the slurry storage device before and after sampling needs to be kept less than or equal to 1%; and when the viscosity difference of other grades of slurry is less than 5mPa & s compared with the slurry with the minimum viscosity, the viscosity characteristics of the two slurries are considered to be the same.
(6) According to the analysis results of the steps (3), (4) and (5) and the particle size, preferably selecting the grading with good stability, weak hardness, low viscosity and coarse particle size as the optimal slurry conveying grading according to the priority sequence of stability, hardness degree, low viscosity and coarse particle size, and comparing the coarse particle size with the grading weighted average particle size; preferably selecting the slurry grading which is most suitable for pipeline transportation;
specific application examples are as follows: the coal gangue source is a flat-topped mountain area coal factory, the total water content of the coal gangue source is 3.04%, and the specific gravity of the coal gangue source is 2.6g/cm 3. The grading selection method comprises the following steps:
1) according to the primary grading table, 2 slurry raw materials with different grades are obtained by grinding, screening and weighing preparation modes, wherein the weighted average grain diameter of the first grading is 0.35mm, and the weighted average grain diameter of the second grading is 0.47 mm.
2) And mixing the first-grade slurry material and the second-grade slurry material with water according to the mass concentration of 50% respectively to obtain the first-grade slurry and the second-grade slurry.
3) And respectively placing 1000ml of the first slurry and two slurries into a 1000ml measuring cylinder for sedimentation analysis. The sedimentation of the first slurry and the second slurry is slow, and the time recording is carried out in an equal time interval mode. And analyzing a relationship graph of the sedimentation amount and the sedimentation time, wherein the accelerated sedimentation section of the first slurry is 70 hours, the accelerated sedimentation section of the second slurry is 10 hours, and both the first slurry and the second slurry are stable.
4) And (4) inserting the slurry I and the slurry II which are subjected to the sedimentation analysis in the step (3) into a probe to perform hard bottom analysis, wherein the slurry cannot generate obvious disturbance before analysis. The settled layer is easy to insert, the loading weight of the upper end of the first slurry probe is 2g, the loading weight of the upper end of the second slurry probe is 5g, and the hardness of the two slurries is weak.
5) And (3) performing viscosity analysis on the first slurry and the second slurry by using a capillary viscosity test principle, wherein the viscosity of the first slurry is 14.9 mPa.S, and the viscosity of the second slurry is 12.3 mPa.S.
6) According to the analysis results of the steps (3), (4) and (5), preferably, the slurry II prepared by the second grading is good in stability, weak in hard bottom degree, small in viscosity, large in weighted average particle size and optimal in coal gangue slurry grading for pipeline transportation.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the structural relationship and principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A selection method for the classification of slurry particles for pipeline transportation is characterized by comprising the following steps:
(1) according to the initial grading table, slurry raw materials with different particle grading are obtained through grinding, screening and weighing preparation modes;
(2) mixing the pulp raw materials with water to obtain pulp with the same mass concentration of the pulp raw materials at all levels;
(3) respectively putting different grades of slurry into different containers with the same specification, and performing settlement analysis;
(4) inserting the pulp subjected to the settleability analysis in the step (3) into a probe with a weight tray for hard bottom analysis;
(5) analyzing the viscosity of different grades of slurry by adopting a capillary viscosity testing principle;
(6) according to the analysis results of the steps (3), (4) and (5) and the particle size, preferably selecting the grading with good stability, weak hard bottom degree, low viscosity and coarse particle size as the best slurry grading for conveying according to the priority order of stability > hard bottom degree > viscosity > particle size, and comparing the grading weighted average particle size according to the particle size; the slurry gradation most suitable for pipeline transportation is preferably selected.
2. The method of claim 1 for selecting a slurry particle gradation for pipeline transportation: the method is characterized in that: in the step (2), the mixing ratio of the pulp raw material to water is carried out according to the mass concentration, and the value range of the mass concentration is 30-50%.
3. The method of claim 1 for selecting a slurry particle gradation for pipeline transportation: the method is characterized in that: the container in the step (3) is a measuring cylinder with the specification of more than or equal to 1000 ml; carrying out sedimentation analysis by recording sedimentation time and sedimentation amount; the sedimentation amount is taken as a recording standard above the sedimentation amount of the interface of the clear liquid and the turbid liquid; the settling time is carried out by adopting different methods according to the settling speed of the slurry; when the slurry is settled quickly, recording the slurry of different levels in a mode of uninterrupted round value; when the slurry is slowly settled, recording in an equal time interval mode; the comparison of the sedimentation speed is measured by the time length of the accelerated sedimentation section, the time of the accelerated sedimentation section is more than or equal to 8 hours, and the slurry stability is good; the settling volume relationship curve tends to plateau.
4. The method of claim 1 for selecting a slurry particle gradation for pipeline transportation: the method is characterized in that: before the sedimentation in the step (4) is completed and the hard bottom analysis is carried out, obvious disturbance cannot be generated in the slurry; the analysis of the hard bottom is carried out by inserting a probe, the length of the probe is 15cm-30cm, the diameter of the probe is 4mm-7mm, a weight tray is arranged at the top end of the probe, the diameter of the probe is 5cm-6cm, the hard bottom degree is measured by adding the weight at the top end of the probe, the weight is less than 30g, and the degree of the hard bottom of the pulp is weak.
5. The method of claim 1 for selecting a slurry particle gradation for pipeline transportation: the method is characterized in that: in the step (5), the flow velocity of the slurry in the capillary is less than 1m/s, the sampling amount is less than or equal to 100ml, and the pressure change value in the slurry storage device before and after sampling is required to be kept less than or equal to 1%; and when the viscosity difference of other grades of slurry is less than 5mPa & s compared with the slurry with the minimum viscosity, the viscosity characteristics of the two slurries are considered to be the same.
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Cited By (4)
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| CN113484203A (en) * | 2021-07-27 | 2021-10-08 | 江西安驰新能源科技有限公司 | Method for evaluating screening condition of lithium battery negative electrode slurry |
| CN113813839A (en) * | 2021-02-24 | 2021-12-21 | 晋江华宝石业有限公司 | Quick grading method and grading device for square stock |
| CN114486632A (en) * | 2021-12-17 | 2022-05-13 | 中煤科工集团武汉设计研究院有限公司 | Coal slurry particle analysis method based on fractal theory |
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| CN113813839A (en) * | 2021-02-24 | 2021-12-21 | 晋江华宝石业有限公司 | Quick grading method and grading device for square stock |
| CN113484203A (en) * | 2021-07-27 | 2021-10-08 | 江西安驰新能源科技有限公司 | Method for evaluating screening condition of lithium battery negative electrode slurry |
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