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对微细粉末,特别是对矿物成因的微细粉末的粒度测定有三种主要的方法:微筛分法、风力分选法和沉降分级法。目前微筛分的下限是公称5微米的筛子,但实际有效通过宽度大多在6～7微米。本文将说明一种测定有效筛孔宽度的方法。风选出的微细粉末用微筛分法只能测定粒度分布最粗的一级,这对生产监控往往是足够了。要快速测定2微米以下的粒度可使用一种经过实践证明了的仪器——多通道轮式分选机。重力沉降分级的典型仪器(Andreas cn吸量管、沉积天平)不适于生产监控;因为
There are three main methods for the determination of the particle size of fine powders, especially of fine powders of mineral origin: micro-screening, wind sorting and sedimentation classification. At present, the lower limit of the micro-sieve is a sieve with a nominal size of 5 micrometers, but the actual effective pass width is mostly between 6 and 7 micrometers. This article describes a method for determining the effective mesh width. Wind selected fine powder with the micro-sieve method can only determine the particle size distribution of the most coarse level, which is often enough for production monitoring. For the rapid determination of particle size below 2 microns a proven multi-channel wheel sorter can be used. Gravity sedimentation classification of the typical instrument (Andreas cn pipette, sedimentation balance) is not suitable for production monitoring; because