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Density Measurement of Coal Slime Powder by Pycnometric Method

Coal slime is solid waste with high solid content, viscosity, fine particles, which is generated in the production process of the coal industry. The density of its powder is an important factor to affect the resistance characteristics of pipeline transportation. Tests show that when the density changes 0.1g/cm3,the corresponding relative error of pipeline transportation resistance is up to 42%.Therefore, accurate density measurement of coal slime powder is the premise to calculate resistance loss, and has significance to study resistance characteristics of pipeline transportation and guide production practices. Based on pycnometric method, this paper improved the measurement, and adopted self-designed exhaust system, which is simple and easy to operate, and can effectively excludes the air in the pycnometer, thus improving measurement accuracy. Practices show that it is an effective method to measure powder density, with easy operation and high accuracy as well as good repeatability.