Abstract: A frictional charging device (30) for charging crushed chips (1) of a plurality of kinds of plastics by stirring them. A stirring vessel (31) has a friction assisting material (52) put therein, the particles of the friction assisting material (52) being so formed that they are larger than the plastic chips (1). A delivery port (34) formed in one end of the stirring vessel (31) is provided with a plurality of delivery area wires (47) arranged at predetermined intervals and parallel to each other. The spacing between adjacent delivery area wires (47) is set larger than the plastic chips (1) and smaller than the particles of the friction assisting material (52).

Abstract: This invention relates to a method and a device for agglomerating particles in a gaseous flow through an acoustical agglomeration chamber (3). According to the invention a portion of the flow at the outlet of the chamber is selectively extracted by preferring larger particles, and is re-injected into the inlet of the chamber.

Abstract: An improved channel for separation of molecular and particulate samples by means of electrical field flow fractionation (FFF) is disclosed. The electrodes therein are made of metal oxide coated flat glass plates and permit the achievement, thereby, all of the seven most desirable features for such an electrical FFF channel, viz. 1) hardness, 2) flatness, 3) smoothness, 4) chemical inertness, 5) durability (does not generate particles), 6) high conductivity, and 7) transparency. In addition, the design of the clamping plates permits high precision in aligning the electrodes for parallelism.

Abstract: A method of treating industrial gases to remove contaminants is disclosed. Ions are generated in stream of injectable gas. These ions are propelled through the contaminated gas as it flows through a collection unit. An electric field is applied to the contaminated gas. The field causes the ions to move through the contaminated gases, producing electrical charges on the contaminants. The electrically charged contaminants are then collected at one side of the electric field. The injectable gas is selected to produce ions which will produce reactions with particular contaminants. The process is thus capable of removing particular contaminants. The process does not depend on diffusion as a transport mechanism and is therefore suitable for removing contaminants which exist in very low concentrations.

Abstract: An improved method for separating electrically conductive components of an ore or mineral sand from electrically non-conductive components of the ore or mineral sand is disclosed which includes processing the ore, adding a polymer, such as an anionic polymer, to the processed ore, drying the polymer and ore, and then feeding the ore and polymer through an electrostatic separator. The addition of the anionic polymer to the processed ore increases the efficiency of the electrostatic separation process.