PROCESS AND EQUIPMENT FOR THE DETERMINATION OF GRAIN SIZE DISTRIBUTION OF PARTICLES IN SUSPENSION

摘要

A process for determination of grain size distribution of particles in suspension in the course of which the suspension is settled in a settling tank and the optical density of the suspension and the grain size distribution are measured. The suspension is homogenized by circulating it in the settling tank, then circulating is stopped and the optical density is repeatedly measured on at least three points with deviating spacings. An equipment for the determination of grain size distribution of particles in suspension comprises a settling tank (1) for the suspension, a means for the measurement of optical density and a computing unit for determination the grain size distribution from the optical density values measured. The settling tank (1) is equipped with a system for the circulation of the suspension and there are at least three measuring heads (2, 3, 4, 5, 6) along the settling tank (1) sensing the optical density along the height of the settling tank (1).