What is the detection method of white corundum grain size sand?
(1) Sieving method. Advantages: simple, intuitive, low equipment cost, often used for samples larger than 40um. Disadvantages: The results are greatly affected by human factors and mesh deformation.
(2) Microscopic (image) method. Advantages: Simple, intuitive, capable of shape analysis, suitable for samples with narrow distribution (the ratio of the largest and smallest particle sizes is less than 10:1). Disadvantages: Poor representation, it is troublesome to analyze samples with a wide distribution range, and samples smaller than 1um cannot be analyzed.
(3) Settlement method (including gravity settling and Li Xin settling). Advantages: the operation is gradual, the instrument can run continuously, the price is low, the accuracy and repeatability are good, and the test range is wide. Disadvantages: The test time is longer and the operation is more cumbersome.
(4) Resistance method. Advantages: The operation gradient can measure the number of particles, the equivalent concept is clear, the speed is fast, and the accuracy is good. Disadvantages: It is not suitable for measuring particle samples smaller than 0.1um, and it is troublesome to replace the small hole tube for samples with wide particle size distribution.
(5) Laser method. Advantages: easy operation, fast test speed, wide test range, good repeatability and accuracy, and can be used for online measurement and dry measurement. Disadvantages: The results are greatly affected by the distribution model, the cost of the instrument is high, and the resolution is low.
(6) Electron microscopy. Advantages: suitable for testing ultra-new particles or even nanoparticles, high resolution, and can be used for morphology and structure analysis. Disadvantages: few samples, poor representativeness, measurement is easily affected by human factors, and the instrument is expensive.
(7) Photoresist method. Advantages: The test is convenient and fast, can measure the number of particles in liquid or gas, and has high resolution. Disadvantages: It is not suitable for samples with a particle size of less than 1umde, and the system is more particular. It is only suitable for the measurement of dust, pollutants or diluted drugs, and it is not used much for general powders.
(8) Ventilation method. Advantages: The price of the instrument is low. It does not need to disperse the sample, but can measure the powder of the material. Disadvantages: Only the average particle size value can be obtained, and the particle size distribution cannot be measured; fine powders smaller than 5um cannot be measured.
(9) X-ray small angle scattering method. Particle size measurement for nanoscale particles.
(10) Photon correlation spectroscopy (dynamic light scattering method). Particle size measurement for nanoscale particles.