Particle Size Detection Methods of White Fused Alumina

White fused alumina is a kind of artificial abrasives, whose production method is very complex. It is made by special smelting process, crushing and dressing, and magnetic separation process, and can be divided into a variety of particle size. So, how to detect particle size of white fused alumina? We will give you specific introduction of several kinds of methods:

A. The screening method:

Advantages: It is simple, intuitive, and low cost, which is often used in more than 40um samples. Weakness: the results are greatly influenced by artificial factors and mesh deformation.

B. The microscope (image)method:

Advantages: It is simple and intuitive, and can get morphology analysis, which is suitable for narrow distribution (the ratio of maximum and minimum size is less than 10:1) samples. Weakness: It is more troublesome to analyze the samples with wide distribution, and less than 1 um samples cannot be analyzed.

C. The settlement method (including gravity sedimentation):

Advantages: the gradient operation; the equipment can run continuously; low prices, better accuracy and repeatability, wide testing range. Weakness: the test time is longer, and it is cumbersome to operate.

D. The resistance method:

Advantages: operating gradient and measurable particle number; clear equivalent concept; great speed and accuracy. Disadvantages: it is not suitable for measuring samples of particles less than 0.1 um, and it is more troublesome to replace holes the samples with wide distribution.

E. The laser method:

Advantages: easy to operate, quick test speed, wide test range, good repeatability and accuracy; it can be carried out online and dry process measurement. Weakness: the results are greatly influenced by distribution model, and the equipment cost is higher, and has low resolution.

F. The electron microscopy method:

Advantages: suitable for testing the new particles or nanoparticles; high resolution; morphology and structure analysis can be performed. Disadvantages: less samples, weak representative, easily affected by man-made factors, expensive instruments.

G. The light resistance method:

Advantages: the test is convenient and fast; it is measurable for particles in the liquid or gas; high resolution. Disadvantages: it does not apply to the samples with particle size less than 1um, only suitable for dust and pollutants or diluted drugs.

H. The air permeability method: 

Advantages: the price of instruments is low and the samples don't need to be spread out. Disadvantages: it can only get the average particle size value, and cannot measure particle size distribution and the powder less than 5um.

I.  Small angle X-ray scattering method: It is for nanoscale particle size measurement.

J. The photon correlation spectroscopy (dynamic light scattering method): It is also for nanoscale particle size measurement.