water cooling electromagnetic separator for Quartz

PTMS MAGNETIC SEPARATOR

what is magnetic separation in Quartz？

True density is an important parameter of materials science, covering a wide range of fields: ceramics, catalysts, filters, nuclear fuel, petrochemicals, soil, fertilizers, carbon black, coke, fiber, minerals, pharmaceuticals, cosmetics, cement, powdered food, dry Agent, powder metal, ion exchange resin, silica gel, alumina, titanium dioxide, solid foam, and the like.

Calculation formula

Formula for calculating the true density of the pattern: ρ=m/v

Where: ρ----true density

m----sample quality

V----the volume of the sample

The above tests are often used in true density testing of lithium ion battery materials.

The significance of testing true density

1. When measuring the specific surface area of ​​a solid substance, such as a powder, data of true density is required for calculation.

2. Many inorganic non-metallic materials are manufactured using powder raw materials, so it is often necessary to determine the true density in research or production.

3. In the manufacture of cement or ceramic materials, it is necessary to measure the fineness of the particle distribution of the clay, and the true density data is required.

4, especially for cement materials, the final product is powder, the determination of true density has great practical significance for the production unit and the use unit.

True density test method

The commonly used methods for determining true density are mainly gas volume method and immersion method (pycnometer method). The so-called gas volume method is based on the law of mass conservation in a closed container, the volume of the sample to be tested (powder) is determined from the measured pressure, and the density of the sample is finally measured by the mass of the sample. The soaking method is based on the Archimedes principle, and the true volume of the powder is measured, and the true density is calculated from the mass of the powder.

1. Impregnation method (pycnometer method):

Applicable: Suitable for small cuts of powder, flakes, pellets or product parts.

Principle: This method determines the true density of powder based on the Archimedes principle.

Method: The powder to be tested is immersed in an immersion liquid which is wetted and dissolved, and the bubble is removed by vacuuming, and the powder sample is taken out from a container of a known capacity to discharge the liquid of a known density, and the measured powder can be calculated. True density.

Problems:

(1) Different samples need to use different immersion liquids to prevent dissolution and reaction with materials; for inorganic powders, organic solvents are often used, and materials that react with water, such as cement, can be kerosene or xylene. Organic liquid medium, etc.;

(2) The immersion liquid should be able to easily wet the surface of the internal pores of the material. If the selected wetting fluid is not appropriate, it will produce a situation that is not easy to wet the surface, affecting the test results;

(3) When testing powdery materials, when the powder is completely immersed in the liquid, the bubbles must be completely removed to determine the volume to be excluded. At this time, it is necessary to use boiling to remove the bubbles, and to use a constant temperature water bath to eliminate the temperature influence. It can't be done easily, it is easy to leak, and the calculation process is susceptible to operational errors;

(4) Due to many operational steps, there are many problem nodes involved. Different operators have different proficiency and different methods, which will directly affect the accuracy of the experimental results.

2. Gas volume method (helium method):

Applicable: Suitable for all kinds of powder, sheet and block materials, especially suitable for porous materials.

Principle: The volume of the sample is measured by replacing the liquid with a gas. The gas can be incorporated into the tiny pores in the sample and the irregular vacancies on the surface, so the measured sample volume is closer to the true volume of the sample, which can be used to calculate the density of the sample, which is closer to the true density of the sample.

Method: The sample is placed in a true density tester, using helium as a medium, and gradually pressurized to a prescribed value in the measurement chamber, and then the helium gas expands into the expansion chamber, and the equilibrium pressure of the two processes is automatically recorded by the instrument, according to The law of conservation of mass, after calibrating the volume of the measuring chamber and the expansion chamber by a standard ball, the volume of the sample is determined, and the true density is calculated.

Advantages:

(1) This method eliminates the possibility that the immersion method dissolves the sample and has the advantage of not damaging the sample.

(2) Using helium instead of infiltrating liquid, helium is a small molecule diameter inert gas, which has the characteristics of easy diffusion, good permeability and good stability, and quickly penetrates into the internal pores of the material, which cannot be measured by conventional methods. Porosity and irregular surface depressions can be quickly filled. The measured sample volume is closer to the true volume of the sample compared to the density bottle method, so that the true density value of the sample is closer to the true value.