An Improved Sedimentation Balance for Particle Size Distribution Analysis of Powder

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  • 沈降天秤式粉体粒度分布測定装置の開発
  • チンコウ テンビンシキ フンタイ リュウド ブンプ ソクテイ ソウチ ノ カイ

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Abstract

The authors developed the chain system sedimentation balance (CSB) and the electromagnetic sedimentation balance (ESB) for the analysis of particle size distribution of powder in 1975 and 1982, respectively.They later developed the improved sedimentation balance (ISB) which is an improved version of the above apparatuses.The present paper describes the outline of the apparatus and the reproducibility of measurements by the ISB.<BR>(1) The ISB has a maximum weighing load of 200 g and weight detection sensitivity of 0.1mg.<BR>(2) In order to prevent the effect of room temperature variation, heat transfer from the room to the balance box was cut off by covering the apparatus with a styrene resin plate containing air bubbles.The zero point of the balance was maintained constant for a long period during measurement.<BR>(3) It was confirmed that the effect of disturbance from the water made by stirring before measurement was limited to within three minutes from the beginning of the measurement.<BR>(4) Particle size distribution analysis of quartz powder was repeated 10 times.There was very good agreement betweenall the particle size distribution curves obtained by the ISB, the ESB and the CSB.<BR>(5) The ratio of the weight of the suspended solids which actually settled on the weighing pan to that of the ideal weight was calculated. The ratios, in percentage were 78.3±2.3, 77.0±3.1and79.6± 1.5 for the ISB, the ESB and the CSB, respectively.It would therefore mean that the reproducibility of measurement by the ISB is intermediate between those by the ESB and the CSB.<BR>(6) A numerical calculation for the analysis of a measured sedimentation curve was developed.The particle size distribution curves obtained by numerical calculation and by graphical analysis agreed with each other very well.

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