Method For Determining The Particle Size And Range Of Application Of White Corundum Abrasives
White corundum abrasive is a kind of artificial abrasive, its production method is very complex, made by special melting process, and then through grinding and shaping, magnetic separation to iron and other processes, screening into a variety of particle size, the white corundum particle size, how to detect it? Here is a specific summary to explain the introduction of multiple methods:
(1) screening method. Advantages: simple, intuitive, low cost of equipment, often used for samples larger than 40um. Disadvantages: The result is strongly influenced by human factors and screening deformation.
(2) Microscopic method (image). Advantages: Simple, intuitive, morphological analysis, suitable for narrow distribution (ratio of maximum to minimum particle size of less than 10:1) of sample. Disadvantages: poor visualization, analysis of samples with wide distribution range is more problematic, and samples with size less than 1 um cannot be analyzed.
(3) Settling method (including gravity settling and Lixin settling). Advantages: stepwise operation, continuous operation of the instrument, low price, good accuracy and repeatability, a wide range of tests. Disadvantages: The test time is longer and the operation is more complicated.
(4) Resistance method. Advantages: The number of particles can be measured step by step, the equivalent concept is clear, the speed is fast, and the accuracy is good. Disadvantages: It is not suitable for measuring particle samples below 0.1 um, and it is troublesome to replace tubes with small holes for samples with wide particle size distribution.
(5) Laser method. Advantages: easy operation, fast testing speed, large testing range, good repeatability and accuracy, online measurement and dry measurement. Disadvantages: The result is strongly influenced by the distribution model, the instrument cost is high and the resolution is low.
(6) Electron microscopy. Advantages: suitable for testing ultra-new particles or even nanoparticles, high resolution, morphology and structure analysis can be performed, Disadvantages: small samples, poor imaging, measurement is susceptible to human factors, and the instrument is expensive.
(7) Photoresistance method. Advantages: convenient and fast test, can measure the number of particles in liquid or gas, high resolution. Disadvantages: not suitable for samples with particle size less than 1umde, the system is more special, only suitable for measuring dust, pollutants or drugs that have been diluted, and not much for general powder.
(8) Breathable method. Advantages: Low equipment price. The material powder can be measured without dispersing the sample. Disadvantages: only the average particle size can be obtained, and the particle size distribution cannot be measured; Do not measure less than 5um fine powder.
(9) X-ray small angle scattering method. Used to measure the particle size of nanoscale particles.
(10) Photon correlation spectroscopy (dynamic light scattering method). Used for measuring the particle size of nanoscale particles.
White corundum abrasives are made of bauxite and graphite electrodes, and are produced by a new ultrafine powder technology. In the production process, the raw materials must be added, stirred, shaped and fired at high temperature. The usage characteristics of white corundum: high refractoriness, stable performance at high temperature, no bursting. It does not pulverise. Corrosion resistance, high hardness, but also has a certain toughness. White corundum is suitable for all kinds of refractory materials in high temperature production. It is widely used in surface grinding of chemical, glass and various metal materials, and can also be used in filtration of water quality.
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