An introduction to granularity, what is the unit of granularity

The ** of particle size analysis instruments is about tens of thousands of yuan per unit, the cheap one is one or two thousand yuan, and the expensive one is one or two hundred thousand yuan. The ** of particle size analysis instruments is affected by many aspects, such as brand, category, specification, market, etc. Before choosing to buy, it is necessary to understand and compare in many aspects.

When a certain physical property or physical behavior of the measured particle is close to that of a homogeneous sphere (or its combination) of a certain diameter, the diameter of the particle (or its combination) is regarded as the equivalent particle size (or particle size distribution) of the measured particle. If you want to know more about particle size analysis instruments, you can consult Shandong Nickert Analytical Instruments, thank you!

granularity, grain size, particle size

The size of the particles. Usually the particle size of a sphere particle is expressed in diameter, and the particle size of a cubic particle is expressed in terms of side length. Generally speaking, the particle size refers to the particle size of the secondary particles after granulation.

For irregular mineral particles, the diameter of a sphere that has the same behavior as the mineral particle can be used as the equivalent diameter of the particle. The commonly used methods for determining the particle size composition of materials in the laboratory include sieve analysis, water analysis and microscopy. Sieve method for determining the particle size of 250 materials.

The measurement range of the laboratory standard sieve is 6; Hydrolysis method, which determines the particle size of particles by the sedimentation rate of particles in water, is used to determine the particle size smaller than the material; The microscope method can determine the projection area of the particles one by one to determine the particle size, the measurement range of the optical microscope is 150, and the lower limit of the measurement of the electron microscope can reach or less.

Commonly used particle size analyzers include laser particle size analyzer, particle image analyzer, ultrasonic particle size analyzer, extinction optical deposition instrument and X-ray deposition instrument.

1.The unit of particle size is the mesh, and the unit of measurement refers to the size of the raw material particles, which is generally expressed by the maximum length of the particles.

2.Particle size refers to the size of the particles.

3.Usually the particle size of the spherical particles is expressed by the diameter, and the particle size of the cube particles is expressed by the side length.

4.For irregular particles, the diameter of a sphere with the same behavior as the particle can be used as the equivalent diameter of the particle.

5.The size of the granularity is commonly displayed in the index tables such as d50, d97, and specific surface area.

Summary. Dear, it's a pleasure to serve you. Granularity is how often progress is tracked.

In general, the minimum granularity is to manage the process in units of one working day. When dividing tasks, the granularity of the tasks should not be too large or too small. If the granularity is too large, it is difficult to find the problem in time; If the granularity is too small, it will increase management costs.

The granularity of the task can be as small as half a day and as large as a week, and generally less than 3 days, that is, the project manager can check the progress of the work of the members at least twice in 1 week. Appropriate task granularity facilitates monitoring on the one hand, and task adjustment on the other.

Dear, it's a pleasure to serve you. Granularity is how often progress is tracked. Generally speaking, the minimum granularity is used in units of one working day for process management.

When dividing tasks, the granularity of the tasks should not be too large or too small. If the granularity is too large, it is difficult to find the problem in time; If the granularity is too small, it will increase management costs. The granularity of the task can be as small as half a day and as large as a week, and generally less than 3 days, that is, the project manager can check the progress of the work of the members at least twice in 1 week.

Appropriate task granularity facilitates monitoring on the one hand, and adjustment of tasks on the other.

Dear, I wish you a happy life.

The words of granularity are: crown mountain and wear grains, cup of water grains, and golden needles to measure people.

The words of granularity are: crown mountain wearing grains, grains are not left, and grains of rice are bundled. 2: The structure is, grain (left and right structure) degree (semi-enclosed structure). 3: Pinyin is, lìdù. 4: Zhuyin is, one

What is the specific explanation of granularity, we will introduce it to you through the following aspects:

1. Explanation of terms [click here to view the details of the plan].

granularity lìdù. (1) The average size of the fragments or ore grains in the rock or sediment.

2. Chinese dictionary.

A numeric value that represents the particle size. Translation of the words in German k rnergr e, kaliber French granularité

3. Network Explanation.

Particle size (the size of the particles)Granularity refers to the size of the particles. Usually the particle size of the spherical particles is expressed by the diameter, and the particle size of the cubic particles is indicated by the edge length of the table silver. For irregular particles, the diameter of a sphere that has the same behavior as the particle can be used as the equivalent diameter of the particle.

The size of the particle size is often expressed by d50, d97, specific surface area and other indicators. Particle size (mineralogical term): The size of the clastic particles is called particle size. Particle size is measured in terms of particle diameter (generally long or medium diameter).

Grain size is the basis for further classification of clastic rocks, and it is also the main object of particle size measurement and genetic analysis, so grain size is an important characteristic parameter of clastic rocks. Due to the different nature and purpose of the work, the granularity classification criteria used by each company are also different. Particle size refers to the relative content of various particles of different sizes in the powder, such as particle size distribution, the cumulative percentage of various particle sizes, and is a measure of the size of the minerals or particles that make up ores, rocks, and soils.

Idioms about granularity.

Flying grains, pearls of rice, jade grains, cinnamon grains, no crowns, mountains and mountains, people outside the grain size, laurel jade grains, rice wolves, cups of water, grains of millet.

Sentence formation about granularity.

1. When making iron in the blast furnace, it is in line with the process, and the iron ore must meet a certain particle size allocation to match the refining process.

2. In order to evaluate the leachability of the ore, the column leaching test was used to determine the influence of ore particle size, leaching agent concentration, percolation velocity, percolation path and other conditions on the process.

3. Through the study of the factors affecting the granularity of the color roll, it is found that the structure of silver halide crystal, the dosage of coloring agent, and the development inhibition compound are the key factors affecting the particle size of the color roll.

4. In such a course, I learned about parallel computing at a finer level than task or thread granularity.

5. The correlation between the particle size of high-purity molybdenum trioxide and the raw material ammonium dimolybdate was studied, and the high-purity molybdenum trioxide required by customers was produced.

The size of the ore grain (or lump) is called the grain size. The materials processed in the crushing, grinding and sorting processes are mixtures of various mineral particles with different particle sizes. The mixture of ore particles is divided into several grades according to particle size, and these grades are called fractions.

The relative amount of each particle fraction in the material is called the particle size composition. The determination of particle size composition is called particle size analysis. The determination of particle size composition is an important task that is commonly encountered in many industrial sectors.

For example, the cement industry, metallurgical industry, pulverized coal preparation, geotechnical testing, and even food processing and other departments will use particle size analysis, which is also an indispensable detection item in the mineral processing test. There is no single particle size analysis method that can be applied to all particle size ranges, and different measurement methods are generally used according to different particle sizes. Table 1 shows the various measurement methods currently used and their scope of application.

Some of the methods derive the particle size distribution, and some methods obtain the average diameter; Some measure particle size directly (e.g., sieve and microscopy); Others are converted based on other parameters (e.g. settlement velocity and specific surface); Some are dry in the gas phase, while others are wet in the liquid phase. Table 1 Particle size determination methods and their applicable particle size ranges The particle size analysis methods often used in mineral processing production and experimental research are sieve analysis, hydrolysis and microscopic analysis. For powdery materials, the specific surface (which refers to the total surface area of the group of ore particles per unit weight) is often determined directly.

The average particle size (diameter) can be calculated from the measured data of the specific surface under certain assumptions. The main methods for determining the specific surface are adsorption method, osmosis method (liquid permeation method; gas permeation). Several particle size determination methods are compared as follows:

The advantages of the sieve method are that the equipment is cheap, robust, easy to make, easy to operate, and suitable for the determination of coarse grains. Generally, the dry sieve can be screened to 100 microns (150 mesh), and then the samarium wet sieve is recommended, and the microporous sieve made by photoelectric technology can be wet sieve to 10 microns, but in fact, less than 40 60 microns are mostly used for settlement analysis, the former is measured by geometric size, and the latter is the equivalent spherical diameter with the same sedimentation velocity. Sieve analysis is greatly influenced by the shape of the particles.

Microscopy is often used to calibrate other measurement methods because it directly observes particle size and shape, and its optimal measurement range is between microns, and when the particle size is expanded to more than 40 microns, it is easy to cause deviations. The biggest advantage of the sedimentation method is that it has good statistics and repeatability, but it is greatly affected by the shape and structure of the particles, and is suitable for 1 75 microns, and the size and shape of the particles cannot be directly observed. The adsorption method is characterized by a large measurement range, but the particle size distribution curve cannot be measured, and can only be indirectly converted to an increased average size, and it is greatly affected by the environment.

Permeation is an economical and simple method for measuring particle size, but it is less reliable and repeatable.