China Powder Science and Technology 

About: China Powder Science and Technology is an academic journal. The journal publishes majorly in the area(s): Particle size & Particle. Over the lifetime, 135 publications have been published receiving 208 citations.

Present State and Development Trend for Ball Mill Load Measurement

Abstract: Measuring the load of ball mill is very important for grinding automationm, the present state for ball mill load measurement is discussed and the development trend is presented.

Measurement Results Comparison Between Laser Particle Analyzer and Sieving Method in Particle Size Distribution

Abstract: In order to compare the difference between the Malvern laser analyzer and the sieving method in particle size distribution measurement,as many as 16 samples of CFB fly ash were measured by both methods respectively.The results from different methods showed a great diversity.The percentages of ultrafine particles obtained with laser analyzer are overestimated.This is considered to be due to the shape of particles.On the other side,the sieving method showed great errors in the measurements of small-sized particles,but more precise in the measurement of bigger particles.Micrography of particles with different size region were taken,which proved that the conglomeration of small particles was the main reason why results were smaller in the measurements of small-sized particles with the sieving method.

An Improved Algorithm of Classical Mie Scattering Calculation

Abstract: The calculation of the classical Mie theory is very important for particle size analysis. In the work, an improved algorithm of Mie scattering calculation is presented. By re-constructing the Mie scattering coefficients, a parameter is found to control the convergence and the precision of the Mie calculation. The related parameters are calculated by means of the proper downward or upward recurrences respectively, which are proved to be very fast and stable. Numerical calculation shows that the algorithm is efficient, reliable and robust in an extremely wide range of particle size and refractive index.

Variations of Black Carbon Aerosol Observed in Beijing and Surrounding Area During 2006—2012

Abstract: The variation characteristics of black carbon(BC) aerosol concentrations in Beijing and surrounding area were presented based on long-term observation at three sites of Shangdianzi, Guanxiangtai in Beijing City and Gucheng in Hebei Province during 2006—2012. The results show that the BC concentrations appear an increasing trend from north to south, with the mean values of mass concentration of(2.2±2.4),(6.5±7.3)and(9.6±8.4) μg/m3 in Shangdianzi, Guanxiangtai and Gucheng respectively. The annual average concentrations of BC show a slight decrease in Shangdianzi, while decrease obviously in Guanxiangtai. The BC concentrations in Gucheng vary few with years and keep on the high level. The seasonal average concentrations of BC are lower in summer and spring in this region. Higher BC concentrations in winter and autumn are likely attributed to the increasing of coal combusion for heating in winter and biomass burning in autumn as well as the relatively worse diffusion conditions. The daily variations of BC concentrations in the three stations are similar, with higher values at night and low in the afternoon.

Contrast Experiments on Cyclone Separator Performances of Shale Ash and FCC Fine Catalysts

Abstract: To determine and compare the separation performances of shale ash and fluidized-bed catalytic cracking(FCC) fine catalysts in a cyclone separator,contrast experiments were carried out.The effects of inlet velocity and inlet concentration on separation efficiency and pressure drop were examined.It is discovered that there are significant discrepancies between the separation performances of 75 μm shale ash and those of FCC fine catalysts,under the same operating conditions and identical cyclone.Both of the separation efficiency and the pressure drop of shale ash are lower than those of FCC fine catalysts.With the incensement of inlet concentration,the pressure drop declining rate of shale ash separators is larger than that of FCC fine particles.The highest separation efficiency of inlet air velocity for shale ash is also lower than that for FCC fine catalysts.The results show that particle characteristics have obvious effects on separation performances of cyclone separators.The particle characteristics and shape disparity of shale ash and fine catalysts is one fundamental reason leading to different performances of their cyclone separation.The effects of particle characteristics of oil shale should be considered when the cyclone separator of oil shale is designed.