Patent ID: 6079911
Filing Date: 2000-06-27
Classification: A01M,B01F

Abstract:
Method for contamination-free metering and conveying of a solid powder which is to be dispersed or dissolved in a dispersing agent or solvent, from a solids storage container to a dispersing or dissolving tank, the solids storage container having a discharge hopper having an inner wall, coaxially with which a downwardly widening cone having a base edge is arranged, which in a closure position rests with the base edge thereof on the hopper inner wall and in an open position is raised from the hopper inner wall so as to leave open an annular gap, said method comprising operating a liquid jet pump with the dispersing agent or solvent to form a liquid jet, supplying said solid powder in a freely flowing manner to said liquid jet pump, said supplying including opening said cone to said open position, dispersing said solid powder in the liquid jet and conveying said solid powder by said liquid jet into the dispersing or dissolving tank, metering an amount of the solid powder with reference to a calibration curve by controlling the amount of time for which the cone is in the open position, and filling the dispersing or dissolving tank with the dispersing agent or solvent.